_ 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.c_type_map = dict(
  18             uint8_t = ['number', 'Uint8Array'],
  19             uint16_t = ['number', 'Uint16Array'],
  20             uint32_t = ['number', 'Uint32Array'],
  21             uint64_t = ['number'],
  22         )
  23
  24         self.wasm_decoding_map = dict(
  25             int8_tArray = 'decodeUint8Array'
  26         )
  27
  28         self.wasm_encoding_map = dict(
  29             int8_tArray = 'encodeUint8Array',
  30         )
  31
  32         self.to_hu_conv_templates = dict(
  33             ptr = 'const {var_name}_hu_conv: {human_type} = new {human_type}(null, {var_name});',
  34             default = 'const {var_name}_hu_conv: {human_type} = new {human_type}(null, {var_name});',
  35         )
  36
  37         self.bindings_header = self.wasm_import_header(target) + """
  38 export class VecOrSliceDef {
  39     public dataptr: number;
  40     public datalen: number;
  41     public stride: number;
  42     public constructor(dataptr: number, datalen: number, stride: number) {
  43         this.dataptr = dataptr;
  44         this.datalen = datalen;
  45         this.stride = stride;
  46     }
  47 }
  48
  49 /*
  50 TODO: load WASM file
  51 static {
  52     System.loadLibrary(\"lightningjni\");
  53     init(java.lang.Enum.class, VecOrSliceDef.class);
  54     init_class_cache();
  55 }
  56
  57 static native void init(java.lang.Class c, java.lang.Class slicedef);
  58 static native void init_class_cache();
  59
  60 public static native boolean deref_bool(long ptr);
  61 public static native long deref_long(long ptr);
  62 public static native void free_heap_ptr(long ptr);
  63 public static native byte[] read_bytes(long ptr, long len);
  64 public static native byte[] get_u8_slice_bytes(long slice_ptr);
  65 public static native long bytes_to_u8_vec(byte[] bytes);
  66 public static native long new_txpointer_copy_data(byte[] txdata);
  67 public static native void txpointer_free(long ptr);
  68 public static native byte[] txpointer_get_buffer(long ptr);
  69 public static native long vec_slice_len(long vec);
  70 public static native long new_empty_slice_vec();
  71 */
  72
  73 """
  74
  75         self.bindings_version_file = ""
  76
  77         self.bindings_footer = ""
  78
  79         self.common_base = """
  80 function freer(f: () => void) { f() }
  81 const finalizer = new FinalizationRegistry(freer);
  82 function get_freeer(ptr: number, free_fn: (number) => void) {
  83         return () => {
  84                 free_fn(ptr);
  85         }
  86 }
  87
  88 export default class CommonBase {
  89         protected ptr: number;
  90         protected ptrs_to: object[] = [];
  91         protected constructor(ptr: number, free_fn: (ptr: number) => void) {
  92                 this.ptr = ptr;
  93                 if (Number.isFinite(ptr) && ptr != 0){
  94                         finalizer.register(this, get_freeer(ptr, free_fn));
  95                 }
  96         }
  97         // In Java, protected means "any subclass can access fields on any other subclass'"
  98         // In TypeScript, protected means "any subclass can access parent fields on instances of itself"
  99         // To work around this, we add accessors for other instances' protected fields here.
 100         protected static add_ref_from(holder: CommonBase, referent: object) {
 101                 holder.ptrs_to.push(referent);
 102         }
 103         protected static get_ptr_of(o: CommonBase) {
 104                 return o.ptr;
 105         }
 106         protected static set_null_skip_free(o: CommonBase) {
 107                 o.ptr = 0;
 108                 finalizer.unregister(o);
 109         }
 110 }
 111 """
 112
 113         self.txout_defn = """export class TxOut extends CommonBase {
 114         /** The script_pubkey in this output */
 115         public script_pubkey: Uint8Array;
 116         /** The value, in satoshis, of this output */
 117         public value: number;
 118
 119         /* @internal */
 120         public constructor(_dummy: object, ptr: number) {
 121                 super(ptr, bindings.TxOut_free);
 122                 this.script_pubkey = bindings.TxOut_get_script_pubkey(ptr);
 123                 this.value = bindings.TxOut_get_value(ptr);
 124         }
 125         public constructor_new(value: number, script_pubkey: Uint8Array): TxOut {
 126                 return new TxOut(null, bindings.TxOut_new(script_pubkey, value));
 127         }
 128 }"""
 129         self.obj_defined(["TxOut"], "structs")
 130
 131         self.c_file_pfx = """#include "js-wasm.h"
 132 #include <stdatomic.h>
 133 #include <lightning.h>
 134
 135 // These should be provided...somehow...
 136 void *memset(void *s, int c, size_t n);
 137 void *memcpy(void *dest, const void *src, size_t n);
 138 int memcmp(const void *s1, const void *s2, size_t n);
 139
 140 void __attribute__((noreturn)) abort(void);
 141 static inline void assert(bool expression) {
 142         if (!expression) { abort(); }
 143 }
 144 """
 145
 146         if not DEBUG:
 147             self.c_file_pfx = self.c_file_pfx + """
 148 void *malloc(size_t size);
 149 void free(void *ptr);
 150
 151 #define MALLOC(a, _) malloc(a)
 152 #define FREE(p) if ((unsigned long)(p) > 4096) { free(p); }
 153 #define DO_ASSERT(a) (void)(a)
 154 #define CHECK(a)
 155 #define CHECK_ACCESS(p)
 156 #define CHECK_INNER_FIELD_ACCESS_OR_NULL(v)
 157 """
 158         else:
 159             self.c_file_pfx = self.c_file_pfx + """
 160 // Always run a, then assert it is true:
 161 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
 162 // Assert a is true or do nothing
 163 #define CHECK(a) DO_ASSERT(a)
 164
 165 // Running a leak check across all the allocations and frees of the JDK is a mess,
 166 // so instead we implement our own naive leak checker here, relying on the -wrap
 167 // linker option to wrap malloc/calloc/realloc/free, tracking everyhing allocated
 168 // and free'd in Rust or C across the generated bindings shared library.
 169
 170 #define BT_MAX 128
 171 typedef struct allocation {
 172         struct allocation* next;
 173         void* ptr;
 174         const char* struct_name;
 175 } allocation;
 176 static allocation* allocation_ll = NULL;
 177
 178 void* __real_malloc(size_t len);
 179 void* __real_calloc(size_t nmemb, size_t len);
 180 static void new_allocation(void* res, const char* struct_name) {
 181         allocation* new_alloc = __real_malloc(sizeof(allocation));
 182         new_alloc->ptr = res;
 183         new_alloc->struct_name = struct_name;
 184         new_alloc->next = allocation_ll;
 185         allocation_ll = new_alloc;
 186 }
 187 static void* MALLOC(size_t len, const char* struct_name) {
 188         void* res = __real_malloc(len);
 189         new_allocation(res, struct_name);
 190         return res;
 191 }
 192 void __real_free(void* ptr);
 193 static void alloc_freed(void* ptr) {
 194         allocation* p = NULL;
 195         allocation* it = allocation_ll;
 196         while (it->ptr != ptr) {
 197                 p = it; it = it->next;
 198                 if (it == NULL) {
 199                         //XXX: fprintf(stderr, "Tried to free unknown pointer %p\\n", ptr);
 200                         return; // addrsan should catch malloc-unknown and print more info than we have
 201                 }
 202         }
 203         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
 204         DO_ASSERT(it->ptr == ptr);
 205         __real_free(it);
 206 }
 207 static void FREE(void* ptr) {
 208         if ((unsigned long)ptr <= 4096) return; // Rust loves to create pointers to the NULL page for dummys
 209         alloc_freed(ptr);
 210         __real_free(ptr);
 211 }
 212
 213 static void CHECK_ACCESS(const void* ptr) {
 214         allocation* it = allocation_ll;
 215         while (it->ptr != ptr) {
 216                 it = it->next;
 217                 if (it == NULL) {
 218                         return; // addrsan should catch malloc-unknown and print more info than we have
 219                 }
 220         }
 221 }
 222 #define CHECK_INNER_FIELD_ACCESS_OR_NULL(v) \\
 223         if (v.is_owned && v.inner != NULL) { \\
 224                 const void *p = __unmangle_inner_ptr(v.inner); \\
 225                 if (p != NULL) { \\
 226                         CHECK_ACCESS(p); \\
 227                 } \\
 228         }
 229
 230 void* __wrap_malloc(size_t len) {
 231         void* res = __real_malloc(len);
 232         new_allocation(res, "malloc call");
 233         return res;
 234 }
 235 void* __wrap_calloc(size_t nmemb, size_t len) {
 236         void* res = __real_calloc(nmemb, len);
 237         new_allocation(res, "calloc call");
 238         return res;
 239 }
 240 void __wrap_free(void* ptr) {
 241         if (ptr == NULL) return;
 242         alloc_freed(ptr);
 243         __real_free(ptr);
 244 }
 245
 246 void* __real_realloc(void* ptr, size_t newlen);
 247 void* __wrap_realloc(void* ptr, size_t len) {
 248         if (ptr != NULL) alloc_freed(ptr);
 249         void* res = __real_realloc(ptr, len);
 250         new_allocation(res, "realloc call");
 251         return res;
 252 }
 253 void __wrap_reallocarray(void* ptr, size_t new_sz) {
 254         // Rust doesn't seem to use reallocarray currently
 255         DO_ASSERT(false);
 256 }
 257
 258 void __attribute__((destructor)) check_leaks() {
 259         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 260                 //XXX: fprintf(stderr, "%s %p remains\\n", a->struct_name, a->ptr);
 261         }
 262         DO_ASSERT(allocation_ll == NULL);
 263 }
 264 """
 265         self.c_file_pfx = self.c_file_pfx + """
 266 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
 267 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
 268 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
 269 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
 270
 271 _Static_assert(sizeof(void*) == 4, "Pointers mut be 32 bits");
 272
 273 #define DECL_ARR_TYPE(ty, name) \\
 274         struct name##array { \\
 275                 uint32_t arr_len; \\
 276                 ty elems[]; \\
 277         }; \\
 278         typedef struct name##array * name##Array; \\
 279         static inline name##Array init_##name##Array(size_t arr_len) { \\
 280                 name##Array arr = (name##Array)MALLOC(arr_len * sizeof(ty) + sizeof(uint32_t), "##name array init"); \\
 281                 arr->arr_len = arr_len; \\
 282                 return arr; \\
 283         }
 284
 285 DECL_ARR_TYPE(int64_t, int64_t);
 286 DECL_ARR_TYPE(int8_t, int8_t);
 287 DECL_ARR_TYPE(uint32_t, uint32_t);
 288 DECL_ARR_TYPE(void*, ptr);
 289 DECL_ARR_TYPE(char, char);
 290 typedef charArray jstring;
 291
 292 static inline jstring str_ref_to_ts(const char* chars, size_t len) {
 293         charArray arr = init_charArray(len);
 294         memcpy(arr->elems, chars, len);
 295         return arr;
 296 }
 297 static inline LDKStr str_ref_to_owned_c(const jstring str) {
 298         char* newchars = MALLOC(str->arr_len + 1, "String chars");
 299         memcpy(newchars, str->elems, str->arr_len);
 300         newchars[str->arr_len] = 0;
 301         LDKStr res = {
 302                 .chars = newchars,
 303                 .len = str->arr_len,
 304                 .chars_is_owned = true
 305         };
 306         return res;
 307 }
 308
 309 typedef bool jboolean;
 310
 311 uint32_t __attribute__((visibility("default"))) TS_malloc(uint32_t size) {
 312         return (uint32_t)MALLOC(size, "JS-Called malloc");
 313 }
 314 void __attribute__((visibility("default"))) TS_free(uint32_t ptr) {
 315         FREE((void*)ptr);
 316 }
 317 """
 318
 319         self.c_version_file = ""
 320
 321         self.hu_struct_file_prefix = """
 322 import CommonBase from './CommonBase.mjs';
 323 import * as bindings from '../bindings.mjs'
 324 import * as InternalUtils from '../InternalUtils.mjs'
 325
 326 """
 327         self.util_fn_pfx = self.hu_struct_file_prefix + "\nexport class UtilMethods extends CommonBase {\n"
 328         self.util_fn_sfx = "}"
 329         self.c_fn_ty_pfx = ""
 330         self.file_ext = ".mts"
 331         self.ptr_c_ty = "uint32_t"
 332         self.ptr_native_ty = "number"
 333         self.result_c_ty = "uint32_t"
 334         self.ptr_arr = "ptrArray"
 335         self.is_arr_some_check = ("", " != 0")
 336         self.get_native_arr_len_call = ("", "->arr_len")
 337
 338         with open(outdir + "/InternalUtils.mts", "w") as f:
 339             f.write("export function check_arr_len(arr: Uint8Array, len: number): Uint8Array {\n")
 340             f.write("\tif (arr.length != len) { throw new Error(\"Expected array of length \" + len + \"got \" + arr.length); }\n")
 341             f.write("\treturn arr;\n")
 342             f.write("}")
 343
 344     def release_native_arr_ptr_call(self, ty_info, arr_var, arr_ptr_var):
 345         return None
 346     def create_native_arr_call(self, arr_len, ty_info):
 347         if ty_info.c_ty == "ptrArray":
 348             assert ty_info.subty is not None and ty_info.subty.c_ty.endswith("Array")
 349         return "init_" + ty_info.c_ty + "(" + arr_len + ")"
 350     def set_native_arr_contents(self, arr_name, arr_len, ty_info):
 351         if ty_info.c_ty == "int8_tArray":
 352             return ("memcpy(" + arr_name + "->elems, ", ", " + arr_len + ")")
 353         else:
 354             assert False
 355     def get_native_arr_contents(self, arr_name, dest_name, arr_len, ty_info, copy):
 356         if ty_info.c_ty == "int8_tArray":
 357             if copy:
 358                 return "memcpy(" + dest_name + ", " + arr_name + "->elems, " + arr_len + ")"
 359         if ty_info.c_ty == "ptrArray":
 360             return "(void*) " + arr_name + "->elems"
 361         else:
 362             assert not copy
 363             return arr_name + "->elems"
 364     def get_native_arr_elem(self, arr_name, idxc, ty_info):
 365         assert False # Only called if above is None
 366     def get_native_arr_ptr_call(self, ty_info):
 367         if ty_info.subty is not None:
 368             return "(" + ty_info.subty.c_ty + "*)(", " + 4)"
 369         return "(" + ty_info.c_ty + "*)(", " + 4)"
 370     def get_native_arr_entry_call(self, ty_info, arr_name, idxc, entry_access):
 371         return None
 372     def cleanup_native_arr_ref_contents(self, arr_name, dest_name, arr_len, ty_info):
 373         if ty_info.c_ty == "int8_tArray":
 374             return None
 375         else:
 376             return None
 377
 378     def map_hu_array_elems(self, arr_name, conv_name, arr_ty, elem_ty):
 379         return arr_name + " != null ? " + arr_name + ".map(" + conv_name + " => " + elem_ty.from_hu_conv[0] + ") : null"
 380
 381     def str_ref_to_native_call(self, var_name, str_len):
 382         return "str_ref_to_ts(" + var_name + ", " + str_len + ")"
 383     def str_ref_to_c_call(self, var_name):
 384         return "str_ref_to_owned_c(" + var_name + ")"
 385
 386     def c_fn_name_define_pfx(self, fn_name, have_args):
 387         return " __attribute__((visibility(\"default\"))) TS_" + fn_name + "("
 388
 389     def wasm_import_header(self, target):
 390         res = """
 391 const imports: any = {};
 392 imports.env = {};
 393
 394 imports.env.tableBase = 0;
 395 imports.env.table = new WebAssembly.Table({initial: 4, element: 'anyfunc'});
 396
 397 imports.env["abort"] = function () {
 398         console.error("ABORT");
 399 };
 400 imports.env["js_invoke_function"] = function(fn: number, arg1: number, arg2: number, arg3: number, arg4: number, arg5: number, arg6: number, arg7: number, arg8: number, arg9: number, arg10: number) {
 401         console.log('function called from wasm:', fn, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9, arg10);
 402 };
 403 imports.env["js_free_function_ptr"] = function(fn: number) {
 404         console.log("function ptr free'd from wasm:", fn);
 405 };
 406
 407 imports.wasi_snapshot_preview1 = {
 408         "fd_write" : () => {
 409                 console.log("ABORT");
 410         },
 411         "random_get" : () => {
 412                 console.log("RAND GET");
 413         },
 414         "environ_sizes_get" : () => {
 415                 console.log("wasi_snapshot_preview1:environ_sizes_get");
 416         },
 417         "proc_exit" : () => {
 418                 console.log("wasi_snapshot_preview1:proc_exit");
 419         },
 420         "environ_get" : () => {
 421                 console.log("wasi_snapshot_preview1:environ_get");
 422         },
 423 };
 424
 425 var wasm = null;
 426 let isWasmInitialized: boolean = false;
 427 """
 428
 429         if target == Target.NODEJS:
 430             res += """import * as fs from 'fs';
 431 export async function initializeWasm(path) {
 432         const source = fs.readFileSync(path);
 433         const { instance: wasmInstance } = await WebAssembly.instantiate(source, imports);
 434         wasm = wasmInstance.exports;
 435         isWasmInitialized = true;
 436 };
 437 """
 438         else:
 439             res += """
 440 export async function initializeWasm(uri) {
 441         const stream = fetch(uri);
 442         const { instance: wasmInstance } = await WebAssembly.instantiateStreaming(stream, imports);
 443         wasm = wasmInstance.exports;
 444         isWasmInitialized = true;
 445 };
 446
 447 """
 448
 449         return res + """
 450
 451
 452 // WASM CODEC
 453
 454 const nextMultipleOfFour = (value: number) => {
 455         return Math.ceil(value / 4) * 4;
 456 }
 457
 458 const encodeUint8Array = (inputArray) => {
 459         const cArrayPointer = wasm.TS_malloc(inputArray.length + 4);
 460         const arrayLengthView = new Uint32Array(wasm.memory.buffer, cArrayPointer, 1);
 461         arrayLengthView[0] = inputArray.length;
 462         const arrayMemoryView = new Uint8Array(wasm.memory.buffer, cArrayPointer + 4, inputArray.length);
 463         arrayMemoryView.set(inputArray);
 464         return cArrayPointer;
 465 }
 466
 467 const encodeUint32Array = (inputArray) => {
 468         const cArrayPointer = wasm.TS_malloc((inputArray.length + 1) * 4);
 469         const arrayMemoryView = new Uint32Array(wasm.memory.buffer, cArrayPointer, inputArray.length);
 470         arrayMemoryView.set(inputArray, 1);
 471         arrayMemoryView[0] = inputArray.length;
 472         return cArrayPointer;
 473 }
 474
 475 const getArrayLength = (arrayPointer) => {
 476         const arraySizeViewer = new Uint32Array(
 477                 wasm.memory.buffer, // value
 478                 arrayPointer, // offset
 479                 1 // one int
 480         );
 481         return arraySizeViewer[0];
 482 }
 483 const decodeUint8Array = (arrayPointer, free = true) => {
 484         const arraySize = getArrayLength(arrayPointer);
 485         const actualArrayViewer = new Uint8Array(
 486                 wasm.memory.buffer, // value
 487                 arrayPointer + 4, // offset (ignoring length bytes)
 488                 arraySize // uint8 count
 489         );
 490         // Clone the contents, TODO: In the future we should wrap the Viewer in a class that
 491         // will free the underlying memory when it becomes unreachable instead of copying here.
 492         const actualArray = actualArrayViewer.slice(0, arraySize);
 493         if (free) {
 494                 wasm.TS_free(arrayPointer);
 495         }
 496         return actualArray;
 497 }
 498 const decodeUint32Array = (arrayPointer, free = true) => {
 499         const arraySize = getArrayLength(arrayPointer);
 500         const actualArrayViewer = new Uint32Array(
 501                 wasm.memory.buffer, // value
 502                 arrayPointer + 4, // offset (ignoring length bytes)
 503                 arraySize // uint32 count
 504         );
 505         // Clone the contents, TODO: In the future we should wrap the Viewer in a class that
 506         // will free the underlying memory when it becomes unreachable instead of copying here.
 507         const actualArray = actualArrayViewer.slice(0, arraySize);
 508         if (free) {
 509                 wasm.TS_free(arrayPointer);
 510         }
 511         return actualArray;
 512 }
 513
 514 const encodeString = (string) => {
 515         // make malloc count divisible by 4
 516         const memoryNeed = nextMultipleOfFour(string.length + 1);
 517         const stringPointer = wasm.TS_malloc(memoryNeed);
 518         const stringMemoryView = new Uint8Array(
 519                 wasm.memory.buffer, // value
 520                 stringPointer, // offset
 521                 string.length + 1 // length
 522         );
 523         for (let i = 0; i < string.length; i++) {
 524                 stringMemoryView[i] = string.charCodeAt(i);
 525         }
 526         stringMemoryView[string.length] = 0;
 527         return stringPointer;
 528 }
 529
 530 const decodeString = (stringPointer, free = true) => {
 531         const memoryView = new Uint8Array(wasm.memory.buffer, stringPointer);
 532         let cursor = 0;
 533         let result = '';
 534
 535         while (memoryView[cursor] !== 0) {
 536                 result += String.fromCharCode(memoryView[cursor]);
 537                 cursor++;
 538         }
 539
 540         if (free) {
 541                 wasm.wasm_free(stringPointer);
 542         }
 543
 544         return result;
 545 };
 546 """
 547
 548     def init_str(self):
 549         return ""
 550
 551     def var_decl_statement(self, ty_string, var_name, statement):
 552         return "const " + var_name + ": " + ty_string + " = " + statement
 553
 554     def for_n_in_range(self, n, minimum, maximum):
 555         return "for (var " + n + " = " + minimum + "; " + n + " < " + maximum + "; " + n + "++) {"
 556     def for_n_in_arr(self, n, arr_name, arr_elem_ty):
 557         return (arr_name + ".forEach((" + n + ": " + arr_elem_ty.java_hu_ty + ") => { ", " })")
 558
 559     def get_ptr(self, var):
 560         return "CommonBase.get_ptr_of(" + var + ")"
 561     def set_null_skip_free(self, var):
 562         return "CommonBase.set_null_skip_free(" + var + ");"
 563
 564     def add_ref(self, holder, referent):
 565         return "CommonBase.add_ref_from(" + holder + ", " + referent + ")"
 566
 567     def obj_defined(self, struct_names, folder):
 568         with open(self.outdir + "/index.mts", 'a') as index:
 569             index.write(f"export * from './{folder}/{struct_names[0]}.mjs';\n")
 570         with open(self.outdir + "/imports.mts.part", 'a') as imports:
 571             imports.write(f"import {{ {', '.join(struct_names)} }} from '../{folder}/{struct_names[0]}.mjs';\n")
 572
 573     def native_c_unitary_enum_map(self, struct_name, variants, enum_doc_comment):
 574         out_c = "static inline LDK" + struct_name + " LDK" + struct_name + "_from_js(int32_t ord) {\n"
 575         out_c = out_c + "\tswitch (ord) {\n"
 576         ord_v = 0
 577
 578         out_typescript_enum_fields = ""
 579
 580         for var, var_docs in variants:
 581             out_c = out_c + "\t\tcase %d: return %s;\n" % (ord_v, var)
 582             ord_v = ord_v + 1
 583             if var_docs is not None:
 584                 out_typescript_enum_fields += f"/**\n * {var_docs}\n */\n"
 585             out_typescript_enum_fields += f"{var},\n\t\t\t\t"
 586         out_c = out_c + "\t}\n"
 587         out_c = out_c + "\tabort();\n"
 588         out_c = out_c + "}\n"
 589
 590         out_c = out_c + "static inline int32_t LDK" + struct_name + "_to_js(LDK" + struct_name + " val) {\n"
 591         out_c = out_c + "\tswitch (val) {\n"
 592         ord_v = 0
 593         for var, _ in variants:
 594             out_c = out_c + "\t\tcase " + var + ": return %d;\n" % ord_v
 595             ord_v = ord_v + 1
 596         out_c = out_c + "\t\tdefault: abort();\n"
 597         out_c = out_c + "\t}\n"
 598         out_c = out_c + "}\n"
 599
 600         out_typescript = f"""
 601             export enum {struct_name} {{
 602                 {out_typescript_enum_fields}
 603             }}
 604 """
 605         out_typescript_enum = f"export {{ {struct_name} }} from \"../bindings.mjs\";"
 606         self.obj_defined([struct_name], "enums")
 607         return (out_c, out_typescript_enum, out_typescript)
 608
 609     def c_unitary_enum_to_native_call(self, ty_info):
 610         return (ty_info.rust_obj + "_to_js(", ")")
 611     def native_unitary_enum_to_c_call(self, ty_info):
 612         return (ty_info.rust_obj + "_from_js(", ")")
 613
 614     def c_complex_enum_pass_ty(self, struct_name):
 615         return "uint32_t"
 616
 617     def c_constr_native_complex_enum(self, struct_name, variant, c_params):
 618         ret = "0 /* " + struct_name + " - " + variant + " */"
 619         for param in c_params:
 620             ret = ret + "; (void) " + param
 621         return ret
 622
 623     def native_c_map_trait(self, struct_name, field_var_conversions, flattened_field_var_conversions, field_function_lines, trait_doc_comment):
 624         out_typescript_bindings = "\n\n\n// OUT_TYPESCRIPT_BINDINGS :: MAP_TRAIT :: START\n\n"
 625
 626         super_instantiator = ""
 627         bindings_instantiator = ""
 628         pointer_to_adder = ""
 629         impl_constructor_arguments = ""
 630         for var in flattened_field_var_conversions:
 631             if isinstance(var, ConvInfo):
 632                 impl_constructor_arguments += f", {var.arg_name}: {var.java_hu_ty}"
 633                 super_instantiator += first_to_lower(var.arg_name) + ", "
 634                 if var.from_hu_conv is not None:
 635                     bindings_instantiator += ", " + var.from_hu_conv[0]
 636                     if var.from_hu_conv[1] != "":
 637                         pointer_to_adder += "\t\t\t" + var.from_hu_conv[1] + ";\n"
 638                 else:
 639                     bindings_instantiator += ", " + first_to_lower(var.arg_name)
 640             else:
 641                 bindings_instantiator += ", " + first_to_lower(var[1]) + ".bindings_instance"
 642                 super_instantiator += first_to_lower(var[1]) + "_impl, "
 643                 pointer_to_adder += "\t\timpl_holder.held.ptrs_to.push(" + first_to_lower(var[1]) + ");\n"
 644                 impl_constructor_arguments += f", {first_to_lower(var[1])}_impl: {var[0].replace('LDK', '')}Interface"
 645
 646         super_constructor_statements = ""
 647         trait_constructor_arguments = ""
 648         for var in field_var_conversions:
 649             if isinstance(var, ConvInfo):
 650                 trait_constructor_arguments += ", " + var.arg_name
 651             else:
 652                 super_constructor_statements += "\t\tconst " + first_to_lower(var[1]) + " = " + var[1] + ".new_impl(" + super_instantiator + ");\n"
 653                 trait_constructor_arguments += ", " + first_to_lower(var[1]) + ".bindings_instance"
 654                 for suparg in var[2]:
 655                     if isinstance(suparg, ConvInfo):
 656                         trait_constructor_arguments += ", " + suparg.arg_name
 657                     else:
 658                         trait_constructor_arguments += ", " + suparg[1]
 659
 660         # BUILD INTERFACE METHODS
 661         out_java_interface = ""
 662         out_interface_implementation_overrides = ""
 663         java_methods = []
 664         for fn_line in field_function_lines:
 665             java_method_descriptor = ""
 666             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 667                 out_java_interface += "\t" + fn_line.fn_name + "("
 668                 out_interface_implementation_overrides += f"\t\t\t{fn_line.fn_name} ("
 669
 670                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 671                     if idx >= 1:
 672                         out_java_interface += ", "
 673                         out_interface_implementation_overrides += ", "
 674                     out_java_interface += f"{arg_conv_info.arg_name}: {arg_conv_info.java_hu_ty}"
 675                     out_interface_implementation_overrides += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
 676                     java_method_descriptor += arg_conv_info.java_fn_ty_arg
 677                 out_java_interface += f"): {fn_line.ret_ty_info.java_hu_ty};\n"
 678                 java_method_descriptor += ")" + fn_line.ret_ty_info.java_fn_ty_arg
 679                 java_methods.append((fn_line.fn_name, java_method_descriptor))
 680
 681                 out_interface_implementation_overrides += f"): {fn_line.ret_ty_info.java_ty} {{\n"
 682
 683                 for arg_info in fn_line.args_ty:
 684                     if arg_info.to_hu_conv is not None:
 685                         out_interface_implementation_overrides += "\t\t\t\t" + arg_info.to_hu_conv.replace("\n", "\n\t\t\t\t") + "\n"
 686
 687                 if fn_line.ret_ty_info.java_ty != "void":
 688                     out_interface_implementation_overrides += "\t\t\t\tconst ret: " + fn_line.ret_ty_info.java_hu_ty + " = arg." + fn_line.fn_name + "("
 689                 else:
 690                     out_interface_implementation_overrides += f"\t\t\t\targ." + fn_line.fn_name + "("
 691
 692                 for idx, arg_info in enumerate(fn_line.args_ty):
 693                     if idx != 0:
 694                         out_interface_implementation_overrides += ", "
 695                     if arg_info.to_hu_conv_name is not None:
 696                         out_interface_implementation_overrides += arg_info.to_hu_conv_name
 697                     else:
 698                         out_interface_implementation_overrides += arg_info.arg_name
 699
 700                 out_interface_implementation_overrides += ");\n"
 701                 if fn_line.ret_ty_info.java_ty != "void":
 702                     if fn_line.ret_ty_info.from_hu_conv is not None:
 703                         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"
 704                         if fn_line.ret_ty_info.from_hu_conv[1] != "":
 705                             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"
 706                         #if fn_line.ret_ty_info.rust_obj in result_types:
 707                         # XXX: We need to handle this in conversion logic so that its cross-language!
 708                         # Avoid double-free by breaking the result - we should learn to clone these and then we can be safe instead
 709                         #    out_interface_implementation_overrides = out_interface_implementation_overrides + "\t\t\t\tret.ptr = 0;\n"
 710                         out_interface_implementation_overrides += "\t\t\t\treturn result;\n"
 711                     else:
 712                         out_interface_implementation_overrides += "\t\t\t\treturn ret;\n"
 713                 out_interface_implementation_overrides += f"\t\t\t}},\n"
 714
 715         out_typescript_human = f"""
 716 {self.hu_struct_file_prefix}
 717
 718 export interface {struct_name.replace("LDK", "")}Interface {{
 719 {out_java_interface}}}
 720
 721 class {struct_name}Holder {{
 722         held: {struct_name.replace("LDK", "")};
 723 }}
 724
 725 export class {struct_name.replace("LDK","")} extends CommonBase {{
 726         /* @internal */
 727         public bindings_instance?: bindings.{struct_name};
 728
 729         /* @internal */
 730         constructor(_dummy: object, ptr: number) {{
 731                 super(ptr, bindings.{struct_name.replace("LDK","")}_free);
 732                 this.bindings_instance = null;
 733         }}
 734
 735         static new_impl(arg: {struct_name.replace("LDK", "")}Interface{impl_constructor_arguments}): {struct_name.replace("LDK", "")} {{
 736                 const impl_holder: {struct_name}Holder = new {struct_name}Holder();
 737                 let structImplementation = {{
 738 {out_interface_implementation_overrides}                }} as bindings.{struct_name};
 739 {super_constructor_statements}          const ptr: number = bindings.{struct_name}_new(structImplementation{bindings_instantiator});
 740
 741                 impl_holder.held = new {struct_name.replace("LDK", "")}(null, ptr);
 742                 impl_holder.held.bindings_instance = structImplementation;
 743 {pointer_to_adder}              return impl_holder.held;
 744         }}
 745 """
 746         self.obj_defined([struct_name.replace("LDK", ""), struct_name.replace("LDK", "") + "Interface"], "structs")
 747
 748         out_typescript_bindings += "\t\texport interface " + struct_name + " {\n"
 749         java_meths = []
 750         for fn_line in field_function_lines:
 751             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 752                 out_typescript_bindings += f"\t\t\t{fn_line.fn_name} ("
 753
 754                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 755                     if idx >= 1:
 756                         out_typescript_bindings = out_typescript_bindings + ", "
 757                     out_typescript_bindings += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
 758
 759                 out_typescript_bindings += f"): {fn_line.ret_ty_info.java_ty};\n"
 760
 761         out_typescript_bindings = out_typescript_bindings + "\t\t}\n\n"
 762
 763         out_typescript_bindings += f"\t\texport function {struct_name}_new(impl: {struct_name}"
 764         for var in flattened_field_var_conversions:
 765             if isinstance(var, ConvInfo):
 766                 out_typescript_bindings += f", {var.arg_name}: {var.java_ty}"
 767             else:
 768                 out_typescript_bindings += f", {var[1]}: {var[0]}"
 769
 770         out_typescript_bindings += f"""): number {{
 771                         throw new Error('unimplemented'); // TODO: bind to WASM
 772                 }}
 773 """
 774
 775         out_typescript_bindings += '\n// OUT_TYPESCRIPT_BINDINGS :: MAP_TRAIT :: END\n\n\n'
 776
 777         # Now that we've written out our java code (and created java_meths), generate C
 778         out_c = "typedef struct " + struct_name + "_JCalls {\n"
 779         out_c = out_c + "\tatomic_size_t refcnt;\n"
 780         for var in flattened_field_var_conversions:
 781             if isinstance(var, ConvInfo):
 782                 # We're a regular ol' field
 783                 pass
 784             else:
 785                 # We're a supertrait
 786                 out_c = out_c + "\t" + var[0] + "_JCalls* " + var[1] + ";\n"
 787         for fn in field_function_lines:
 788             if fn.fn_name != "free" and fn.fn_name != "cloned":
 789                 out_c = out_c + "\tuint32_t " + fn.fn_name + "_meth;\n"
 790         out_c = out_c + "} " + struct_name + "_JCalls;\n"
 791
 792         for fn_line in field_function_lines:
 793             if fn_line.fn_name == "free":
 794                 out_c = out_c + "static void " + struct_name + "_JCalls_free(void* this_arg) {\n"
 795                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 796                 out_c = out_c + "\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n"
 797                 for fn in field_function_lines:
 798                     if fn.fn_name != "free" and fn.fn_name != "cloned":
 799                         out_c = out_c + "\t\tjs_free_function_ptr(j_calls->" + fn.fn_name + "_meth);\n"
 800                 out_c = out_c + "\t\tFREE(j_calls);\n"
 801                 out_c = out_c + "\t}\n}\n"
 802
 803         for idx, fn_line in enumerate(field_function_lines):
 804             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 805                 assert fn_line.ret_ty_info.ty_info.get_full_rust_ty()[1] == ""
 806                 out_c = out_c + fn_line.ret_ty_info.ty_info.get_full_rust_ty()[0] + " " + fn_line.fn_name + "_" + struct_name + "_jcall("
 807                 if fn_line.self_is_const:
 808                     out_c = out_c + "const void* this_arg"
 809                 else:
 810                     out_c = out_c + "void* this_arg"
 811
 812                 for idx, arg in enumerate(fn_line.args_ty):
 813                     out_c = out_c + ", " + arg.ty_info.get_full_rust_ty()[0] + " " + arg.arg_name + arg.ty_info.get_full_rust_ty()[1]
 814
 815                 out_c = out_c + ") {\n"
 816                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 817
 818                 for arg_info in fn_line.args_ty:
 819                     if arg_info.ret_conv is not None:
 820                         out_c = out_c + "\t" + arg_info.ret_conv[0].replace('\n', '\n\t')
 821                         out_c = out_c + arg_info.arg_name
 822                         out_c = out_c + arg_info.ret_conv[1].replace('\n', '\n\t') + "\n"
 823
 824                 if fn_line.ret_ty_info.c_ty.endswith("Array"):
 825                     out_c += "\t" + fn_line.ret_ty_info.c_ty + " ret = (" + fn_line.ret_ty_info.c_ty + ")"
 826                     out_c += "js_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->" + fn_line.fn_name + "_meth"
 827                 elif fn_line.ret_ty_info.java_ty == "void":
 828                     out_c = out_c + "\tjs_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->" + fn_line.fn_name + "_meth"
 829                 elif fn_line.ret_ty_info.java_ty == "String":
 830                     out_c = out_c + "\tjstring ret = (jstring)js_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->" + fn_line.fn_name + "_meth"
 831                 elif not fn_line.ret_ty_info.passed_as_ptr:
 832                     out_c = out_c + "\treturn js_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->" + fn_line.fn_name + "_meth"
 833                 else:
 834                     out_c = out_c + "\tuint32_t ret = js_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->" + fn_line.fn_name + "_meth"
 835
 836                 for idx, arg_info in enumerate(fn_line.args_ty):
 837                     if arg_info.ret_conv is not None:
 838                         out_c = out_c + ", (uint32_t)" + arg_info.ret_conv_name
 839                     else:
 840                         out_c = out_c + ", (uint32_t)" + arg_info.arg_name
 841                 out_c = out_c + ");\n"
 842                 if fn_line.ret_ty_info.arg_conv is not None:
 843                     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"
 844
 845                 out_c = out_c + "}\n"
 846
 847         # Write out a clone function whether we need one or not, as we use them in moving to rust
 848         out_c = out_c + "static void " + struct_name + "_JCalls_cloned(" + struct_name + "* new_obj) {\n"
 849         out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) new_obj->this_arg;\n"
 850         out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n"
 851         for var in field_var_conversions:
 852             if not isinstance(var, ConvInfo):
 853                 out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->" + var[1] + "->refcnt, 1, memory_order_release);\n"
 854         out_c = out_c + "}\n"
 855
 856         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_init (/*TODO: JS Object Reference */void* o"
 857         for var in flattened_field_var_conversions:
 858             if isinstance(var, ConvInfo):
 859                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 860             else:
 861                 out_c = out_c + ", /*TODO: JS Object Reference */void* " + var[1]
 862         out_c = out_c + ") {\n"
 863
 864         out_c = out_c + "\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n"
 865         out_c = out_c + "\tatomic_init(&calls->refcnt, 1);\n"
 866         out_c = out_c + "\t//TODO: Assign calls->o from o\n"
 867
 868         for (fn_name, java_meth_descr) in java_meths:
 869             if fn_name != "free" and fn_name != "cloned":
 870                 out_c = out_c + "\tcalls->" + fn_name + "_meth = (*env)->GetMethodID(env, c, \"" + fn_name + "\", \"" + java_meth_descr + "\");\n"
 871                 out_c = out_c + "\tCHECK(calls->" + fn_name + "_meth != NULL);\n"
 872
 873         for var in flattened_field_var_conversions:
 874             if isinstance(var, ConvInfo) and var.arg_conv is not None:
 875                 out_c = out_c + "\n\t" + var.arg_conv.replace("\n", "\n\t") +"\n"
 876         out_c = out_c + "\n\t" + struct_name + " ret = {\n"
 877         out_c = out_c + "\t\t.this_arg = (void*) calls,\n"
 878         for fn_line in field_function_lines:
 879             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 880                 out_c = out_c + "\t\t." + fn_line.fn_name + " = " + fn_line.fn_name + "_" + struct_name + "_jcall,\n"
 881             elif fn_line.fn_name == "free":
 882                 out_c = out_c + "\t\t.free = " + struct_name + "_JCalls_free,\n"
 883             else:
 884                 out_c = out_c + "\t\t.cloned = " + struct_name + "_JCalls_cloned,\n"
 885         for var in field_var_conversions:
 886             if isinstance(var, ConvInfo):
 887                 if var.arg_conv_name is not None:
 888                     out_c = out_c + "\t\t." + var.arg_name + " = " + var.arg_conv_name + ",\n"
 889                     out_c = out_c + "\t\t.set_" + var.arg_name + " = NULL,\n"
 890                 else:
 891                     out_c = out_c + "\t\t." + var.var_name + " = " + var.var_name + ",\n"
 892                     out_c = out_c + "\t\t.set_" + var.var_name + " = NULL,\n"
 893             else:
 894                 out_c += "\t\t." + var[1] + " = " + var[0] + "_init(" + var[1]
 895                 for suparg in var[2]:
 896                     if isinstance(suparg, ConvInfo):
 897                         out_c += ", " + suparg.arg_name
 898                     else:
 899                         out_c += ", " + suparg[1]
 900                 out_c += "),\n"
 901         out_c = out_c + "\t};\n"
 902         for var in flattened_field_var_conversions:
 903             if not isinstance(var, ConvInfo):
 904                 out_c = out_c + "\tcalls->" + var[1] + " = ret." + var[1] + ".this_arg;\n"
 905         out_c = out_c + "\treturn ret;\n"
 906         out_c = out_c + "}\n"
 907
 908         out_c = out_c + self.c_fn_ty_pfx + "long " + self.c_fn_name_define_pfx(struct_name + "_new", True) + "/*TODO: JS Object Reference */void* o"
 909         for var in flattened_field_var_conversions:
 910             if isinstance(var, ConvInfo):
 911                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 912             else:
 913                 out_c = out_c + ", /*TODO: JS Object Reference */ void* " + var[1]
 914         out_c = out_c + ") {\n"
 915         out_c = out_c + "\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n"
 916         out_c = out_c + "\t*res_ptr = " + struct_name + "_init(o"
 917         for var in flattened_field_var_conversions:
 918             if isinstance(var, ConvInfo):
 919                 out_c = out_c + ", " + var.arg_name
 920             else:
 921                 out_c = out_c + ", " + var[1]
 922         out_c = out_c + ");\n"
 923         out_c = out_c + "\treturn (long)res_ptr;\n"
 924         out_c = out_c + "}\n"
 925
 926         return (out_typescript_bindings, out_typescript_human, out_c)
 927
 928     def trait_struct_inc_refcnt(self, ty_info):
 929         return ""
 930
 931     def map_complex_enum(self, struct_name, variant_list, camel_to_snake, enum_doc_comment):
 932         bindings_type = struct_name.replace("LDK", "")
 933         java_hu_type = struct_name.replace("LDK", "").replace("COption", "Option")
 934
 935         out_java_enum = ""
 936         out_java = ""
 937         out_c = ""
 938
 939         out_java_enum += (self.hu_struct_file_prefix)
 940
 941         java_hu_class = ""
 942         java_hu_class += "export class " + java_hu_type + " extends CommonBase {\n"
 943         java_hu_class += "\tprotected constructor(_dummy: object, ptr: number) { super(ptr, bindings." + bindings_type + "_free); }\n"
 944         java_hu_class += "\t/* @internal */\n"
 945         java_hu_class += f"\tpublic static constr_from_ptr(ptr: number): {java_hu_type} {{\n"
 946         java_hu_class += f"\t\tconst raw_val: bindings.{struct_name} = bindings." + struct_name + "_ref_from_ptr(ptr);\n"
 947         java_hu_subclasses = ""
 948
 949         out_java += "\texport class " + struct_name + " {\n"
 950         out_java += "\t\tprotected constructor() {}\n"
 951         java_subclasses = ""
 952         for var in variant_list:
 953             java_subclasses += "\texport class " + struct_name + "_" + var.var_name + " extends " + struct_name + " {\n"
 954             java_hu_subclasses = java_hu_subclasses + "export class " + java_hu_type + "_" + var.var_name + " extends " + java_hu_type + " {\n"
 955             java_hu_class += "\t\tif (raw_val instanceof bindings." + struct_name + "_" + var.var_name + ") {\n"
 956             java_hu_class += "\t\t\treturn new " + java_hu_type + "_" + var.var_name + "(ptr, raw_val);\n"
 957             init_meth_params = ""
 958             hu_conv_body = ""
 959             for idx, (field_ty, field_docs) in enumerate(var.fields):
 960                 java_hu_subclasses = java_hu_subclasses + "\tpublic " + field_ty.arg_name + f": {field_ty.java_hu_ty};\n"
 961                 if field_ty.to_hu_conv is not None:
 962                     hu_conv_body = hu_conv_body + "\t\tconst " + field_ty.arg_name + f": {field_ty.java_ty} = obj." + field_ty.arg_name + ";\n"
 963                     hu_conv_body = hu_conv_body + "\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
 964                     hu_conv_body = hu_conv_body + "\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
 965                 else:
 966                     hu_conv_body = hu_conv_body + "\t\tthis." + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
 967                 if idx > 0:
 968                     init_meth_params += ", "
 969                 init_meth_params += "public " + field_ty.arg_name + ": " + field_ty.java_ty
 970             java_subclasses += "\t\tconstructor(" + init_meth_params + ") { super(); }\n"
 971             java_subclasses += "\t}\n"
 972             java_hu_class += "\t\t}\n"
 973             java_hu_subclasses += "\t/* @internal */\n"
 974             java_hu_subclasses += "\tpublic constructor(ptr: number, obj: bindings." + struct_name + "_" + var.var_name + ") {\n\t\tsuper(null, ptr);\n"
 975             java_hu_subclasses = java_hu_subclasses + hu_conv_body
 976             java_hu_subclasses = java_hu_subclasses + "\t}\n}\n"
 977         out_java += ("\t}\n")
 978         out_java += java_subclasses
 979         java_hu_class += "\t\tthrow new Error('oops, this should be unreachable'); // Unreachable without extending the (internal) bindings interface\n\t}\n\n"
 980         out_java += self.fn_call_body(struct_name + "_ref_from_ptr", "uint32_t", "number", "ptr: number", "ptr")
 981
 982         out_c += (self.c_fn_ty_pfx + self.c_complex_enum_pass_ty(struct_name) + self.c_fn_name_define_pfx(struct_name + "_ref_from_ptr", True) + self.ptr_c_ty + " ptr) {\n")
 983         out_c += ("\t" + struct_name + " *obj = (" + struct_name + "*)(ptr & ~1);\n")
 984         out_c += ("\tswitch(obj->tag) {\n")
 985         for var in variant_list:
 986             out_c += ("\t\tcase " + struct_name + "_" + var.var_name + ": {\n")
 987             c_params = []
 988             for idx, (field_map, _) in enumerate(var.fields):
 989                 if field_map.ret_conv is not None:
 990                     out_c += ("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
 991                     if var.tuple_variant:
 992                         out_c += "obj->" + camel_to_snake(var.var_name)
 993                     else:
 994                         out_c += "obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name
 995                     out_c += (field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
 996                     c_params.append(field_map.ret_conv_name)
 997                 else:
 998                     if var.tuple_variant:
 999                         c_params.append("obj->" + camel_to_snake(var.var_name))
1000                     else:
1001                         c_params.append("obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name)
1002             out_c += ("\t\t\treturn " + self.c_constr_native_complex_enum(struct_name, var.var_name, c_params) + ";\n")
1003             out_c += ("\t\t}\n")
1004         out_c += ("\t\tdefault: abort();\n")
1005         out_c += ("\t}\n}\n")
1006         out_java_enum += java_hu_class
1007         self.struct_file_suffixes[java_hu_type] = java_hu_subclasses
1008         self.obj_defined([java_hu_type], "structs")
1009         return (out_java, out_java_enum, out_c)
1010
1011     def map_opaque_struct(self, struct_name, struct_doc_comment):
1012         implementations = ""
1013         method_header = ""
1014         if struct_name.startswith("LDKLocked"):
1015             return "NOT IMPLEMENTED"
1016
1017         hu_name = struct_name.replace("LDKC2Tuple", "TwoTuple").replace("LDKC3Tuple", "ThreeTuple").replace("LDK", "")
1018         out_opaque_struct_human = f"""{self.hu_struct_file_prefix}
1019
1020 export class {hu_name} extends CommonBase {implementations}{{
1021         /* @internal */
1022         public constructor(_dummy: object, ptr: number) {{
1023                 super(ptr, bindings.{struct_name.replace("LDK","")}_free);
1024         }}
1025
1026 """
1027         self.obj_defined([hu_name], "structs")
1028         return out_opaque_struct_human
1029
1030     def map_tuple(self, struct_name):
1031         return self.map_opaque_struct(struct_name, "A Tuple")
1032
1033     def map_result(self, struct_name, res_map, err_map):
1034         human_ty = struct_name.replace("LDKCResult", "Result")
1035
1036         suffixes = f"export class {human_ty}_OK extends {human_ty} {{\n"
1037         if res_map.java_hu_ty != "void":
1038             suffixes += "\tpublic res: " + res_map.java_hu_ty + ";\n"
1039         suffixes += f"""
1040         /* @internal */
1041         public constructor(_dummy: object, ptr: number) {{
1042                 super(_dummy, ptr);
1043 """
1044         if res_map.java_hu_ty == "void":
1045             pass
1046         elif res_map.to_hu_conv is not None:
1047             suffixes += "\t\tconst res: " + res_map.java_ty + " = bindings." + struct_name.replace("LDK", "") + "_get_ok(ptr);\n"
1048             suffixes += "\t\t" + res_map.to_hu_conv.replace("\n", "\n\t\t")
1049             suffixes += "\n\t\tthis.res = " + res_map.to_hu_conv_name + ";\n"
1050         else:
1051             suffixes += "\t\tthis.res = bindings." + struct_name.replace("LDK", "") + "_get_ok(ptr);\n"
1052         suffixes += "\t}\n}\n"
1053
1054         suffixes += f"export class {human_ty}_Err extends {human_ty} {{\n"
1055         if err_map.java_hu_ty != "void":
1056             suffixes += "\tpublic err: " + err_map.java_hu_ty + ";\n"
1057         suffixes += f"""
1058         /* @internal */
1059         public constructor(_dummy: object, ptr: number) {{
1060                 super(_dummy, ptr);
1061 """
1062         if err_map.java_hu_ty == "void":
1063             pass
1064         elif err_map.to_hu_conv is not None:
1065             suffixes += "\t\tconst err: " + err_map.java_ty + " = bindings." + struct_name.replace("LDK", "") + "_get_err(ptr);\n"
1066             suffixes += "\t\t" + err_map.to_hu_conv.replace("\n", "\n\t\t")
1067             suffixes += "\n\t\tthis.err = " + err_map.to_hu_conv_name + ";\n"
1068         else:
1069             suffixes += "\t\tthis.err = bindings." + struct_name.replace("LDK", "") + "_get_err(ptr);\n"
1070         suffixes += "\t}\n}"
1071
1072         self.struct_file_suffixes[human_ty] = suffixes
1073         self.obj_defined([human_ty], "structs")
1074
1075         return f"""{self.hu_struct_file_prefix}
1076
1077 export class {human_ty} extends CommonBase {{
1078         protected constructor(_dummy: object, ptr: number) {{
1079                 super(ptr, bindings.{struct_name.replace("LDK","")}_free);
1080         }}
1081         /* @internal */
1082         public static constr_from_ptr(ptr: number): {human_ty} {{
1083                 if (bindings.{struct_name.replace("LDK", "")}_is_ok(ptr)) {{
1084                         return new {human_ty}_OK(null, ptr);
1085                 }} else {{
1086                         return new {human_ty}_Err(null, ptr);
1087                 }}
1088         }}
1089 """
1090
1091     def fn_call_body(self, method_name, return_c_ty, return_java_ty, method_argument_string, native_call_argument_string):
1092         has_return_value = return_c_ty != 'void'
1093         needs_decoding = return_c_ty in self.wasm_decoding_map
1094         return_statement = 'return nativeResponseValue;'
1095         if not has_return_value:
1096             return_statement = '// debug statements here'
1097         elif needs_decoding:
1098             converter = self.wasm_decoding_map[return_c_ty]
1099             return_statement = f"return {converter}(nativeResponseValue);"
1100
1101         return f"""\texport function {method_name}({method_argument_string}): {return_java_ty} {{
1102                 if(!isWasmInitialized) {{
1103                         throw new Error("initializeWasm() must be awaited first!");
1104                 }}
1105                 const nativeResponseValue = wasm.TS_{method_name}({native_call_argument_string});
1106                 {return_statement}
1107         }}
1108 """
1109     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):
1110         out_java = ""
1111         out_c = ""
1112         out_java_struct = None
1113
1114         out_java += ("\t")
1115         out_c += (self.c_fn_ty_pfx)
1116         out_c += (return_type_info.c_ty)
1117         out_java += (return_type_info.java_ty)
1118         if return_type_info.ret_conv is not None:
1119             ret_conv_pfx, ret_conv_sfx = return_type_info.ret_conv
1120         out_java += (" " + method_name + "(")
1121         out_c += (" "  + self.c_fn_name_define_pfx(method_name, True))
1122
1123         method_argument_string = ""
1124         native_call_argument_string = ""
1125         for idx, arg_conv_info in enumerate(argument_types):
1126             if idx != 0:
1127                 method_argument_string += (", ")
1128                 native_call_argument_string += ', '
1129                 out_c += (", ")
1130             if arg_conv_info.c_ty != "void":
1131                 out_c += (arg_conv_info.c_ty + " " + arg_conv_info.arg_name)
1132                 needs_encoding = arg_conv_info.c_ty in self.wasm_encoding_map
1133                 native_argument = arg_conv_info.arg_name
1134                 if needs_encoding:
1135                     converter = self.wasm_encoding_map[arg_conv_info.c_ty]
1136                     native_argument = f"{converter}({arg_conv_info.arg_name})"
1137                 method_argument_string += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
1138                 native_call_argument_string += native_argument
1139         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)
1140
1141         out_java_struct = ""
1142         if not args_known:
1143             out_java_struct += ("\t// Skipped " + method_name + "\n")
1144         else:
1145             if not takes_self:
1146                 out_java_struct += (
1147                         "\tpublic static constructor_" + meth_n + "(")
1148             else:
1149                 out_java_struct += ("\tpublic " + meth_n + "(")
1150             for idx, arg in enumerate(argument_types):
1151                 if idx != 0:
1152                     if not takes_self or idx > 1:
1153                         out_java_struct += (", ")
1154                 elif takes_self:
1155                     continue
1156                 if arg.java_ty != "void":
1157                     if arg.arg_name in default_constructor_args:
1158                         for explode_idx, explode_arg in enumerate(default_constructor_args[arg.arg_name]):
1159                             if explode_idx != 0:
1160                                 out_java_struct += (", ")
1161                             out_java_struct += arg.arg_name + "_" + explode_arg.arg_name + ": " + explode_arg.java_hu_ty
1162                     else:
1163                         out_java_struct += arg.arg_name + ": " + arg.java_hu_ty
1164
1165         out_c += (") {\n")
1166         if out_java_struct is not None:
1167             out_java_struct += "): " + return_type_info.java_hu_ty + " {\n"
1168         for info in argument_types:
1169             if info.arg_conv is not None:
1170                 out_c += ("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
1171         if return_type_info.ret_conv is not None:
1172             out_c += ("\t" + ret_conv_pfx.replace('\n', '\n\t'))
1173         elif return_type_info.c_ty != "void":
1174             out_c += ("\t" + return_type_info.c_ty + " ret_val = ")
1175         else:
1176             out_c += ("\t")
1177         if c_call_string is None:
1178             out_c += (method_name + "(")
1179         else:
1180             out_c += (c_call_string)
1181         for idx, info in enumerate(argument_types):
1182             if info.arg_conv_name is not None:
1183                 if idx != 0:
1184                     out_c += (", ")
1185                 elif c_call_string is not None:
1186                     continue
1187                 out_c += (info.arg_conv_name)
1188         out_c += (")")
1189         if return_type_info.ret_conv is not None:
1190             out_c += (ret_conv_sfx.replace('\n', '\n\t'))
1191         else:
1192             out_c += (";")
1193         for info in argument_types:
1194             if info.arg_conv_cleanup is not None:
1195                 out_c += ("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
1196         if return_type_info.ret_conv is not None:
1197             out_c += ("\n\treturn " + return_type_info.ret_conv_name + ";")
1198         elif return_type_info.c_ty != "void":
1199             out_c += ("\n\treturn ret_val;")
1200         out_c += ("\n}\n\n")
1201
1202         if args_known:
1203             out_java_struct += ("\t\t")
1204             if return_type_info.java_ty != "void":
1205                 out_java_struct += "const ret: " + return_type_info.java_ty + " = "
1206             out_java_struct += ("bindings." + method_name + "(")
1207             for idx, info in enumerate(argument_types):
1208                 if idx != 0:
1209                     out_java_struct += (", ")
1210                 if idx == 0 and takes_self:
1211                     out_java_struct += ("this.ptr")
1212                 elif info.arg_name in default_constructor_args:
1213                     out_java_struct += ("bindings." + info.java_hu_ty + "_new(")
1214                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
1215                         if explode_idx != 0:
1216                             out_java_struct += (", ")
1217                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1218                         if explode_arg.from_hu_conv is not None:
1219                             out_java_struct += (
1220                                 explode_arg.from_hu_conv[0].replace(explode_arg.arg_name, expl_arg_name))
1221                         else:
1222                             out_java_struct += (expl_arg_name)
1223                     out_java_struct += (")")
1224                 elif info.from_hu_conv is not None:
1225                     out_java_struct += (info.from_hu_conv[0])
1226                 else:
1227                     out_java_struct += (info.arg_name)
1228             out_java_struct += (");\n")
1229             if return_type_info.to_hu_conv is not None:
1230                 if not takes_self:
1231                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t").replace("this",
1232                                                                                                              return_type_info.to_hu_conv_name) + "\n")
1233                 else:
1234                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t") + "\n")
1235
1236             for idx, info in enumerate(argument_types):
1237                 if idx == 0 and takes_self:
1238                     pass
1239                 elif info.arg_name in default_constructor_args:
1240                     for explode_arg in default_constructor_args[info.arg_name]:
1241                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1242                         if explode_arg.from_hu_conv is not None and return_type_info.to_hu_conv_name:
1243                             out_java_struct += ("\t\t" + explode_arg.from_hu_conv[1].replace(explode_arg.arg_name,
1244                                                                                              expl_arg_name).replace(
1245                                 "this", return_type_info.to_hu_conv_name) + ";\n")
1246                 elif info.from_hu_conv is not None and info.from_hu_conv[1] != "":
1247                     if not takes_self and return_type_info.to_hu_conv_name is not None:
1248                         out_java_struct += (
1249                                 "\t\t" + info.from_hu_conv[1].replace("this", return_type_info.to_hu_conv_name).replace("\n", "\n\t\t") + ";\n")
1250                     else:
1251                         out_java_struct += ("\t\t" + info.from_hu_conv[1].replace("\n", "\n\t\t") + ";\n")
1252
1253             if return_type_info.to_hu_conv_name is not None:
1254                 out_java_struct += ("\t\treturn " + return_type_info.to_hu_conv_name + ";\n")
1255             elif return_type_info.java_ty != "void" and return_type_info.rust_obj != "LDK" + struct_meth:
1256                 out_java_struct += ("\t\treturn ret;\n")
1257             out_java_struct += ("\t}\n\n")
1258
1259         return (out_java, out_c, out_java_struct)
1260
1261     def cleanup(self):
1262         for struct in self.struct_file_suffixes:
1263             with open(self.outdir + "/structs/" + struct + self.file_ext, "a") as src:
1264                 src.write(self.struct_file_suffixes[struct])