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