_ 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
 301 """
 302         self.c_fn_ty_pfx = ""
 303         self.file_ext = ".mts"
 304         self.ptr_c_ty = "uint32_t"
 305         self.ptr_native_ty = "number"
 306         self.result_c_ty = "uint32_t"
 307         self.ptr_arr = "ptrArray"
 308         self.is_arr_some_check = ("", " != 0")
 309         self.get_native_arr_len_call = ("", "->arr_len")
 310
 311     def release_native_arr_ptr_call(self, ty_info, arr_var, arr_ptr_var):
 312         return None
 313     def create_native_arr_call(self, arr_len, ty_info):
 314         if ty_info.c_ty == "ptrArray":
 315             assert ty_info.subty is not None and ty_info.subty.c_ty.endswith("Array")
 316         return "init_" + ty_info.c_ty + "(" + arr_len + ")"
 317     def set_native_arr_contents(self, arr_name, arr_len, ty_info):
 318         if ty_info.c_ty == "int8_tArray":
 319             return ("memcpy(" + arr_name + "->elems, ", ", " + arr_len + ")")
 320         else:
 321             assert False
 322     def get_native_arr_contents(self, arr_name, dest_name, arr_len, ty_info, copy):
 323         if ty_info.c_ty == "int8_tArray":
 324             if copy:
 325                 return "memcpy(" + dest_name + ", " + arr_name + "->elems, " + arr_len + ")"
 326         if ty_info.c_ty == "ptrArray":
 327             return "(void*) " + arr_name + "->elems"
 328         else:
 329             assert not copy
 330             return arr_name + "->elems"
 331     def get_native_arr_elem(self, arr_name, idxc, ty_info):
 332         assert False # Only called if above is None
 333     def get_native_arr_ptr_call(self, ty_info):
 334         if ty_info.subty is not None:
 335             return "(" + ty_info.subty.c_ty + "*)(", " + 4)"
 336         return "(" + ty_info.c_ty + "*)(", " + 4)"
 337     def get_native_arr_entry_call(self, ty_info, arr_name, idxc, entry_access):
 338         return None
 339     def cleanup_native_arr_ref_contents(self, arr_name, dest_name, arr_len, ty_info):
 340         if ty_info.c_ty == "int8_tArray":
 341             return None
 342         else:
 343             return None
 344
 345     def str_ref_to_native_call(self, var_name, str_len):
 346         return "str_ref_to_ts(" + var_name + ", " + str_len + ")"
 347     def str_ref_to_c_call(self, var_name):
 348         return "str_ref_to_owned_c(" + var_name + ")"
 349
 350     def c_fn_name_define_pfx(self, fn_name, have_args):
 351         return " __attribute__((visibility(\"default\"))) TS_" + fn_name + "("
 352
 353     def wasm_import_header(self, target):
 354         res = """
 355 const memory = new WebAssembly.Memory({initial: 256});
 356
 357 const imports: any = {};
 358 imports.env = {};
 359
 360 imports.env.memoryBase = 0;
 361 imports.env.memory = memory;
 362 imports.env.tableBase = 0;
 363 imports.env.table = new WebAssembly.Table({initial: 4, element: 'anyfunc'});
 364
 365 imports.env["abort"] = function () {
 366         console.error("ABORT");
 367 };
 368 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) {
 369         console.log('function called from wasm:', fn, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9, arg10);
 370 };
 371 imports.env["js_free_function_ptr"] = function(fn: number) {
 372         console.log("function ptr free'd from wasm:", fn);
 373 };
 374
 375 imports.wasi_snapshot_preview1 = {
 376         "fd_write" : () => {
 377                 console.log("ABORT");
 378         },
 379         "random_get" : () => {
 380                 console.log("RAND GET");
 381         },
 382         "environ_sizes_get" : () => {
 383                 console.log("wasi_snapshot_preview1:environ_sizes_get");
 384         },
 385         "proc_exit" : () => {
 386                 console.log("wasi_snapshot_preview1:proc_exit");
 387         },
 388         "environ_get" : () => {
 389                 console.log("wasi_snapshot_preview1:environ_get");
 390         },
 391 };
 392
 393 var wasm = null;
 394 let isWasmInitialized: boolean = false;
 395 """
 396
 397         if target == Target.NODEJS:
 398             res += """import * as fs from 'fs';
 399 export async function initializeWasm(path) {
 400         const source = fs.readFileSync(path);
 401         const { instance: wasmInstance } = await WebAssembly.instantiate(source, imports);
 402         wasm = wasmInstance.exports;
 403         isWasmInitialized = true;
 404 };
 405 """
 406         else:
 407             res += """
 408 export async function initializeWasm(uri) {
 409         const stream = fetch(uri);
 410         const { instance: wasmInstance } = await WebAssembly.instantiateStreaming(stream, imports);
 411         wasm = wasmInstance.exports;
 412         isWasmInitialized = true;
 413 };
 414
 415 """
 416
 417         return res + """
 418
 419
 420 // WASM CODEC
 421
 422 const nextMultipleOfFour = (value: number) => {
 423         return Math.ceil(value / 4) * 4;
 424 }
 425
 426 const encodeUint8Array = (inputArray) => {
 427         const cArrayPointer = wasm.TS_malloc(inputArray.length + 4);
 428         const arrayLengthView = new Uint32Array(memory.buffer, cArrayPointer, 1);
 429         arrayLengthView[0] = inputArray.length;
 430         const arrayMemoryView = new Uint8Array(memory.buffer, cArrayPointer + 4, inputArray.length);
 431         arrayMemoryView.set(inputArray);
 432         return cArrayPointer;
 433 }
 434
 435 const encodeUint32Array = (inputArray) => {
 436         const cArrayPointer = wasm.TS_malloc((inputArray.length + 1) * 4);
 437         const arrayMemoryView = new Uint32Array(memory.buffer, cArrayPointer, inputArray.length);
 438         arrayMemoryView.set(inputArray, 1);
 439         arrayMemoryView[0] = inputArray.length;
 440         return cArrayPointer;
 441 }
 442
 443 const getArrayLength = (arrayPointer) => {
 444         const arraySizeViewer = new Uint32Array(
 445                 memory.buffer, // value
 446                 arrayPointer, // offset
 447                 1 // one int
 448         );
 449         return arraySizeViewer[0];
 450 }
 451 const decodeUint8Array = (arrayPointer, free = true) => {
 452         const arraySize = getArrayLength(arrayPointer);
 453         const actualArrayViewer = new Uint8Array(
 454                 memory.buffer, // value
 455                 arrayPointer + 4, // offset (ignoring length bytes)
 456                 arraySize // uint8 count
 457         );
 458         // Clone the contents, TODO: In the future we should wrap the Viewer in a class that
 459         // will free the underlying memory when it becomes unreachable instead of copying here.
 460         const actualArray = actualArrayViewer.slice(0, arraySize);
 461         if (free) {
 462                 wasm.TS_free(arrayPointer);
 463         }
 464         return actualArray;
 465 }
 466 const decodeUint32Array = (arrayPointer, free = true) => {
 467         const arraySize = getArrayLength(arrayPointer);
 468         const actualArrayViewer = new Uint32Array(
 469                 memory.buffer, // value
 470                 arrayPointer + 4, // offset (ignoring length bytes)
 471                 arraySize // uint32 count
 472         );
 473         // Clone the contents, TODO: In the future we should wrap the Viewer in a class that
 474         // will free the underlying memory when it becomes unreachable instead of copying here.
 475         const actualArray = actualArrayViewer.slice(0, arraySize);
 476         if (free) {
 477                 wasm.TS_free(arrayPointer);
 478         }
 479         return actualArray;
 480 }
 481
 482 const encodeString = (string) => {
 483         // make malloc count divisible by 4
 484         const memoryNeed = nextMultipleOfFour(string.length + 1);
 485         const stringPointer = wasm.TS_malloc(memoryNeed);
 486         const stringMemoryView = new Uint8Array(
 487                 memory.buffer, // value
 488                 stringPointer, // offset
 489                 string.length + 1 // length
 490         );
 491         for (let i = 0; i < string.length; i++) {
 492                 stringMemoryView[i] = string.charCodeAt(i);
 493         }
 494         stringMemoryView[string.length] = 0;
 495         return stringPointer;
 496 }
 497
 498 const decodeString = (stringPointer, free = true) => {
 499         const memoryView = new Uint8Array(memory.buffer, stringPointer);
 500         let cursor = 0;
 501         let result = '';
 502
 503         while (memoryView[cursor] !== 0) {
 504                 result += String.fromCharCode(memoryView[cursor]);
 505                 cursor++;
 506         }
 507
 508         if (free) {
 509                 wasm.wasm_free(stringPointer);
 510         }
 511
 512         return result;
 513 };
 514 """
 515
 516     def init_str(self):
 517         return ""
 518
 519     def var_decl_statement(self, ty_string, var_name, statement):
 520         return "const " + var_name + ": " + ty_string + " = " + statement
 521
 522     def add_ref(self, holder, referent):
 523         return "CommonBase.add_ref_from(" + holder + ", " + referent + ")"
 524
 525     def native_c_unitary_enum_map(self, struct_name, variants, enum_doc_comment):
 526         out_c = "static inline LDK" + struct_name + " LDK" + struct_name + "_from_js(int32_t ord) {\n"
 527         out_c = out_c + "\tswitch (ord) {\n"
 528         ord_v = 0
 529
 530         out_typescript_enum_fields = ""
 531
 532         for var, var_docs in variants:
 533             out_c = out_c + "\t\tcase %d: return %s;\n" % (ord_v, var)
 534             ord_v = ord_v + 1
 535             if var_docs is not None:
 536                 out_typescript_enum_fields += f"/**\n * {var_docs}\n */\n"
 537             out_typescript_enum_fields += f"{var},\n\t\t\t\t"
 538         out_c = out_c + "\t}\n"
 539         out_c = out_c + "\tabort();\n"
 540         out_c = out_c + "}\n"
 541
 542         out_c = out_c + "static inline int32_t LDK" + struct_name + "_to_js(LDK" + struct_name + " val) {\n"
 543         out_c = out_c + "\tswitch (val) {\n"
 544         ord_v = 0
 545         for var, _ in variants:
 546             out_c = out_c + "\t\tcase " + var + ": return %d;\n" % ord_v
 547             ord_v = ord_v + 1
 548         out_c = out_c + "\t\tdefault: abort();\n"
 549         out_c = out_c + "\t}\n"
 550         out_c = out_c + "}\n"
 551
 552         out_typescript = f"""
 553             export enum {struct_name} {{
 554                 {out_typescript_enum_fields}
 555             }}
 556 """
 557         out_typescript_enum = f"export {{ {struct_name} }} from \"../bindings.mjs\";"
 558         return (out_c, out_typescript_enum, out_typescript)
 559
 560     def c_unitary_enum_to_native_call(self, ty_info):
 561         return (ty_info.rust_obj + "_to_js(", ")")
 562     def native_unitary_enum_to_c_call(self, ty_info):
 563         return (ty_info.rust_obj + "_from_js(", ")")
 564
 565     def c_complex_enum_pass_ty(self, struct_name):
 566         return "uint32_t"
 567
 568     def c_constr_native_complex_enum(self, struct_name, variant, c_params):
 569         ret = "0 /* " + struct_name + " - " + variant + " */"
 570         for param in c_params:
 571             ret = ret + "; (void) " + param
 572         return ret
 573
 574     def native_c_map_trait(self, struct_name, field_var_conversions, flattened_field_var_conversions, field_function_lines, trait_doc_comment):
 575         out_typescript_bindings = "\n\n\n// OUT_TYPESCRIPT_BINDINGS :: MAP_TRAIT :: START\n\n"
 576
 577         constructor_arguments = ""
 578         super_instantiator = ""
 579         pointer_to_adder = ""
 580         impl_constructor_arguments = ""
 581         for var in flattened_field_var_conversions:
 582             if isinstance(var, ConvInfo):
 583                 constructor_arguments += f", {first_to_lower(var.arg_name)}?: {var.java_hu_ty}"
 584                 impl_constructor_arguments += f", {var.arg_name}: {var.java_hu_ty}"
 585                 if var.from_hu_conv is not None:
 586                     super_instantiator += ", " + var.from_hu_conv[0]
 587                     if var.from_hu_conv[1] != "":
 588                         pointer_to_adder += var.from_hu_conv[1] + ";\n"
 589                 else:
 590                     super_instantiator += ", " + first_to_lower(var.arg_name)
 591             else:
 592                 constructor_arguments += f", {first_to_lower(var[1])}?: bindings.{var[0]}"
 593                 super_instantiator += ", " + first_to_lower(var[1])
 594                 pointer_to_adder += "this.ptrs_to.push(" + first_to_lower(var[1]) + ");\n"
 595                 impl_constructor_arguments += f", {first_to_lower(var[1])}_impl: {var[0].replace('LDK', '')}.{var[0].replace('LDK', '')}Interface"
 596
 597         # BUILD INTERFACE METHODS
 598         out_java_interface = ""
 599         out_interface_implementation_overrides = ""
 600         java_methods = []
 601         for fn_line in field_function_lines:
 602             java_method_descriptor = ""
 603             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 604                 out_java_interface += fn_line.fn_name + "("
 605                 out_interface_implementation_overrides += f"{fn_line.fn_name} ("
 606
 607                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 608                     if idx >= 1:
 609                         out_java_interface += ", "
 610                         out_interface_implementation_overrides += ", "
 611                     out_java_interface += f"{arg_conv_info.arg_name}: {arg_conv_info.java_hu_ty}"
 612                     out_interface_implementation_overrides += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
 613                     java_method_descriptor += arg_conv_info.java_fn_ty_arg
 614                 out_java_interface += f"): {fn_line.ret_ty_info.java_hu_ty};\n\t\t\t\t"
 615                 java_method_descriptor += ")" + fn_line.ret_ty_info.java_fn_ty_arg
 616                 java_methods.append((fn_line.fn_name, java_method_descriptor))
 617
 618                 out_interface_implementation_overrides += f"): {fn_line.ret_ty_info.java_ty} {{\n"
 619
 620                 interface_method_override_inset = "\t\t\t\t\t\t"
 621                 interface_implementation_inset = "\t\t\t\t\t\t\t"
 622                 for arg_info in fn_line.args_ty:
 623                     if arg_info.to_hu_conv is not None:
 624                         out_interface_implementation_overrides += interface_implementation_inset + arg_info.to_hu_conv.replace("\n", "\n\t\t\t\t") + "\n"
 625
 626                 if fn_line.ret_ty_info.java_ty != "void":
 627                     out_interface_implementation_overrides += interface_implementation_inset + fn_line.ret_ty_info.java_hu_ty + " ret = arg." + fn_line.fn_name + "("
 628                 else:
 629                     out_interface_implementation_overrides += f"{interface_implementation_inset}arg." + fn_line.fn_name + "("
 630
 631                 for idx, arg_info in enumerate(fn_line.args_ty):
 632                     if idx != 0:
 633                         out_interface_implementation_overrides += ", "
 634                     if arg_info.to_hu_conv_name is not None:
 635                         out_interface_implementation_overrides += arg_info.to_hu_conv_name
 636                     else:
 637                         out_interface_implementation_overrides += arg_info.arg_name
 638
 639                 out_interface_implementation_overrides += ");\n"
 640                 if fn_line.ret_ty_info.java_ty != "void":
 641                     if fn_line.ret_ty_info.from_hu_conv is not None:
 642                         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"
 643                         if fn_line.ret_ty_info.from_hu_conv[1] != "":
 644                             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"
 645                         #if fn_line.ret_ty_info.rust_obj in result_types:
 646                         # XXX: We need to handle this in conversion logic so that its cross-language!
 647                         # Avoid double-free by breaking the result - we should learn to clone these and then we can be safe instead
 648                         #    out_interface_implementation_overrides = out_interface_implementation_overrides + "\t\t\t\tret.ptr = 0;\n"
 649                         out_interface_implementation_overrides = out_interface_implementation_overrides + "\t\t\t\treturn result;\n"
 650                     else:
 651                         out_interface_implementation_overrides = out_interface_implementation_overrides + "\t\t\t\treturn ret;\n"
 652                 out_interface_implementation_overrides += f"{interface_method_override_inset}}},\n\n{interface_method_override_inset}"
 653
 654         trait_constructor_arguments = ""
 655         for var in field_var_conversions:
 656             if isinstance(var, ConvInfo):
 657                 trait_constructor_arguments += ", " + var.arg_name
 658             else:
 659                 trait_constructor_arguments += ", " + var[1] + ".new_impl(" + var[1] + "_impl"
 660                 for suparg in var[2]:
 661                     if isinstance(suparg, ConvInfo):
 662                         trait_constructor_arguments += ", " + suparg.arg_name
 663                     else:
 664                         trait_constructor_arguments += ", " + suparg[1]
 665                 trait_constructor_arguments += ").bindings_instance"
 666                 for suparg in var[2]:
 667                     if isinstance(suparg, ConvInfo):
 668                         trait_constructor_arguments += ", " + suparg.arg_name
 669                     else:
 670                         trait_constructor_arguments += ", " + suparg[1]
 671
 672         out_typescript_human = f"""
 673 {self.hu_struct_file_prefix}
 674
 675 {struct_name.replace("LDK","")} extends CommonBase {{
 676
 677         bindings_instance?: bindings.{struct_name};
 678
 679         constructor(ptr?: number, arg?: bindings.{struct_name}{constructor_arguments}) {{
 680                 if (Number.isFinite(ptr)) {{
 681                         super(ptr, bindings.{struct_name.replace("LDK","")}_free);
 682                         this.bindings_instance = null;
 683                 }} else {{
 684                         // TODO: private constructor instantiation
 685                         super(bindings.{struct_name}_new(arg{super_instantiator}));
 686                         this.ptrs_to.push(arg);
 687                         {pointer_to_adder}
 688                 }}
 689         }}
 690
 691         static new_impl(arg: {struct_name.replace("LDK", "")}Interface{impl_constructor_arguments}): {struct_name.replace("LDK", "")} {{
 692                 const impl_holder: {struct_name}Holder = new {struct_name}Holder();
 693                 let structImplementation = <bindings.{struct_name}>{{
 694                         // todo: in-line interface filling
 695                         {out_interface_implementation_overrides}
 696                 }};
 697                 impl_holder.held = new {struct_name.replace("LDK", "")} (null, structImplementation{trait_constructor_arguments});
 698         }}
 699
 700         export interface {struct_name.replace("LDK", "")}Interface {{
 701                 {out_java_interface}
 702         }}
 703
 704         class {struct_name}Holder {{
 705                 held: {struct_name.replace("LDK", "")};
 706         }}
 707 """
 708
 709         out_typescript_bindings += "\t\texport interface " + struct_name + " {\n"
 710         java_meths = []
 711         for fn_line in field_function_lines:
 712             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 713                 out_typescript_bindings += f"\t\t\t{fn_line.fn_name} ("
 714
 715                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 716                     if idx >= 1:
 717                         out_typescript_bindings = out_typescript_bindings + ", "
 718                     out_typescript_bindings += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
 719
 720                 out_typescript_bindings += f"): {fn_line.ret_ty_info.java_ty};\n"
 721
 722         out_typescript_bindings = out_typescript_bindings + "\t\t}\n\n"
 723
 724         out_typescript_bindings += f"\t\texport function {struct_name}_new(impl: {struct_name}"
 725         for var in flattened_field_var_conversions:
 726             if isinstance(var, ConvInfo):
 727                 out_typescript_bindings += f", {var.arg_name}: {var.java_ty}"
 728             else:
 729                 out_typescript_bindings += f", {var[1]}: {var[0]}"
 730
 731         out_typescript_bindings += f"""): number {{
 732             throw new Error('unimplemented'); // TODO: bind to WASM
 733         }}
 734 """
 735
 736         out_typescript_bindings += '\n// OUT_TYPESCRIPT_BINDINGS :: MAP_TRAIT :: END\n\n\n'
 737
 738         # Now that we've written out our java code (and created java_meths), generate C
 739         out_c = "typedef struct " + struct_name + "_JCalls {\n"
 740         out_c = out_c + "\tatomic_size_t refcnt;\n"
 741         for var in flattened_field_var_conversions:
 742             if isinstance(var, ConvInfo):
 743                 # We're a regular ol' field
 744                 pass
 745             else:
 746                 # We're a supertrait
 747                 out_c = out_c + "\t" + var[0] + "_JCalls* " + var[1] + ";\n"
 748         for fn in field_function_lines:
 749             if fn.fn_name != "free" and fn.fn_name != "cloned":
 750                 out_c = out_c + "\tuint32_t " + fn.fn_name + "_meth;\n"
 751         out_c = out_c + "} " + struct_name + "_JCalls;\n"
 752
 753         for fn_line in field_function_lines:
 754             if fn_line.fn_name == "free":
 755                 out_c = out_c + "static void " + struct_name + "_JCalls_free(void* this_arg) {\n"
 756                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 757                 out_c = out_c + "\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n"
 758                 for fn in field_function_lines:
 759                     if fn.fn_name != "free" and fn.fn_name != "cloned":
 760                         out_c = out_c + "\t\tjs_free_function_ptr(j_calls->" + fn.fn_name + "_meth);\n"
 761                 out_c = out_c + "\t\tFREE(j_calls);\n"
 762                 out_c = out_c + "\t}\n}\n"
 763
 764         for idx, fn_line in enumerate(field_function_lines):
 765             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 766                 assert fn_line.ret_ty_info.ty_info.get_full_rust_ty()[1] == ""
 767                 out_c = out_c + fn_line.ret_ty_info.ty_info.get_full_rust_ty()[0] + " " + fn_line.fn_name + "_" + struct_name + "_jcall("
 768                 if fn_line.self_is_const:
 769                     out_c = out_c + "const void* this_arg"
 770                 else:
 771                     out_c = out_c + "void* this_arg"
 772
 773                 for idx, arg in enumerate(fn_line.args_ty):
 774                     out_c = out_c + ", " + arg.ty_info.get_full_rust_ty()[0] + " " + arg.arg_name + arg.ty_info.get_full_rust_ty()[1]
 775
 776                 out_c = out_c + ") {\n"
 777                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 778
 779                 for arg_info in fn_line.args_ty:
 780                     if arg_info.ret_conv is not None:
 781                         out_c = out_c + "\t" + arg_info.ret_conv[0].replace('\n', '\n\t')
 782                         out_c = out_c + arg_info.arg_name
 783                         out_c = out_c + arg_info.ret_conv[1].replace('\n', '\n\t') + "\n"
 784
 785                 if fn_line.ret_ty_info.c_ty.endswith("Array"):
 786                     out_c += "\t" + fn_line.ret_ty_info.c_ty + " ret = (" + fn_line.ret_ty_info.c_ty + ")"
 787                     out_c += "js_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->" + fn_line.fn_name + "_meth"
 788                 elif fn_line.ret_ty_info.java_ty == "void":
 789                     out_c = out_c + "\tjs_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->" + fn_line.fn_name + "_meth"
 790                 elif fn_line.ret_ty_info.java_ty == "String":
 791                     out_c = out_c + "\tjstring ret = (jstring)js_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->" + fn_line.fn_name + "_meth"
 792                 elif not fn_line.ret_ty_info.passed_as_ptr:
 793                     out_c = out_c + "\treturn js_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->" + fn_line.fn_name + "_meth"
 794                 else:
 795                     out_c = out_c + "\tuint32_t ret = js_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->" + fn_line.fn_name + "_meth"
 796
 797                 for idx, arg_info in enumerate(fn_line.args_ty):
 798                     if arg_info.ret_conv is not None:
 799                         out_c = out_c + ", (uint32_t)" + arg_info.ret_conv_name
 800                     else:
 801                         out_c = out_c + ", (uint32_t)" + arg_info.arg_name
 802                 out_c = out_c + ");\n"
 803                 if fn_line.ret_ty_info.arg_conv is not None:
 804                     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"
 805
 806                 out_c = out_c + "}\n"
 807
 808         # Write out a clone function whether we need one or not, as we use them in moving to rust
 809         out_c = out_c + "static void " + struct_name + "_JCalls_cloned(" + struct_name + "* new_obj) {\n"
 810         out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) new_obj->this_arg;\n"
 811         out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n"
 812         for var in field_var_conversions:
 813             if not isinstance(var, ConvInfo):
 814                 out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->" + var[1] + "->refcnt, 1, memory_order_release);\n"
 815         out_c = out_c + "}\n"
 816
 817         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_init (/*TODO: JS Object Reference */void* o"
 818         for var in flattened_field_var_conversions:
 819             if isinstance(var, ConvInfo):
 820                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 821             else:
 822                 out_c = out_c + ", /*TODO: JS Object Reference */void* " + var[1]
 823         out_c = out_c + ") {\n"
 824
 825         out_c = out_c + "\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n"
 826         out_c = out_c + "\tatomic_init(&calls->refcnt, 1);\n"
 827         out_c = out_c + "\t//TODO: Assign calls->o from o\n"
 828
 829         for (fn_name, java_meth_descr) in java_meths:
 830             if fn_name != "free" and fn_name != "cloned":
 831                 out_c = out_c + "\tcalls->" + fn_name + "_meth = (*env)->GetMethodID(env, c, \"" + fn_name + "\", \"" + java_meth_descr + "\");\n"
 832                 out_c = out_c + "\tCHECK(calls->" + fn_name + "_meth != NULL);\n"
 833
 834         for var in flattened_field_var_conversions:
 835             if isinstance(var, ConvInfo) and var.arg_conv is not None:
 836                 out_c = out_c + "\n\t" + var.arg_conv.replace("\n", "\n\t") +"\n"
 837         out_c = out_c + "\n\t" + struct_name + " ret = {\n"
 838         out_c = out_c + "\t\t.this_arg = (void*) calls,\n"
 839         for fn_line in field_function_lines:
 840             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 841                 out_c = out_c + "\t\t." + fn_line.fn_name + " = " + fn_line.fn_name + "_" + struct_name + "_jcall,\n"
 842             elif fn_line.fn_name == "free":
 843                 out_c = out_c + "\t\t.free = " + struct_name + "_JCalls_free,\n"
 844             else:
 845                 out_c = out_c + "\t\t.cloned = " + struct_name + "_JCalls_cloned,\n"
 846         for var in field_var_conversions:
 847             if isinstance(var, ConvInfo):
 848                 if var.arg_conv_name is not None:
 849                     out_c = out_c + "\t\t." + var.arg_name + " = " + var.arg_conv_name + ",\n"
 850                     out_c = out_c + "\t\t.set_" + var.arg_name + " = NULL,\n"
 851                 else:
 852                     out_c = out_c + "\t\t." + var.var_name + " = " + var.var_name + ",\n"
 853                     out_c = out_c + "\t\t.set_" + var.var_name + " = NULL,\n"
 854             else:
 855                 out_c += "\t\t." + var[1] + " = " + var[0] + "_init(" + var[1]
 856                 for suparg in var[2]:
 857                     if isinstance(suparg, ConvInfo):
 858                         out_c += ", " + suparg.arg_name
 859                     else:
 860                         out_c += ", " + suparg[1]
 861                 out_c += "),\n"
 862         out_c = out_c + "\t};\n"
 863         for var in flattened_field_var_conversions:
 864             if not isinstance(var, ConvInfo):
 865                 out_c = out_c + "\tcalls->" + var[1] + " = ret." + var[1] + ".this_arg;\n"
 866         out_c = out_c + "\treturn ret;\n"
 867         out_c = out_c + "}\n"
 868
 869         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"
 870         for var in flattened_field_var_conversions:
 871             if isinstance(var, ConvInfo):
 872                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 873             else:
 874                 out_c = out_c + ", /*TODO: JS Object Reference */ void* " + var[1]
 875         out_c = out_c + ") {\n"
 876         out_c = out_c + "\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n"
 877         out_c = out_c + "\t*res_ptr = " + struct_name + "_init(o"
 878         for var in flattened_field_var_conversions:
 879             if isinstance(var, ConvInfo):
 880                 out_c = out_c + ", " + var.arg_name
 881             else:
 882                 out_c = out_c + ", " + var[1]
 883         out_c = out_c + ");\n"
 884         out_c = out_c + "\treturn (long)res_ptr;\n"
 885         out_c = out_c + "}\n"
 886
 887         return (out_typescript_bindings, out_typescript_human, out_c)
 888
 889     def trait_struct_inc_refcnt(self, ty_info):
 890         return ""
 891
 892     def map_complex_enum(self, struct_name, variant_list, camel_to_snake, enum_doc_comment):
 893         bindings_type = struct_name.replace("LDK", "")
 894         java_hu_type = struct_name.replace("LDK", "").replace("COption", "Option")
 895
 896         out_java_enum = ""
 897         out_java = ""
 898         out_c = ""
 899
 900         out_java_enum += (self.hu_struct_file_prefix)
 901
 902         java_hu_class = ""
 903         java_hu_class += "export class " + java_hu_type + " extends CommonBase {\n"
 904         java_hu_class += "\tprotected constructor(_dummy: object, ptr: number) { super(ptr, bindings." + bindings_type + "_free); }\n"
 905         java_hu_class += "\t/* @internal */\n"
 906         java_hu_class += f"\tpublic static constr_from_ptr(ptr: number): {java_hu_type} {{\n"
 907         java_hu_class += f"\t\tconst raw_val: bindings.{struct_name} = bindings." + struct_name + "_ref_from_ptr(ptr);\n"
 908         java_hu_subclasses = ""
 909
 910         out_java += "\texport class " + struct_name + " {\n"
 911         out_java += "\t\tprotected constructor() {}\n"
 912         java_subclasses = ""
 913         for var in variant_list:
 914             java_subclasses += "\texport class " + struct_name + "_" + var.var_name + " extends " + struct_name + " {\n"
 915             java_hu_subclasses = java_hu_subclasses + "export class " + java_hu_type + "_" + var.var_name + " extends " + java_hu_type + " {\n"
 916             java_hu_class += "\t\tif (raw_val instanceof bindings." + struct_name + "_" + var.var_name + ") {\n"
 917             java_hu_class += "\t\t\treturn new " + java_hu_type + "_" + var.var_name + "(ptr, raw_val);\n"
 918             init_meth_params = ""
 919             hu_conv_body = ""
 920             for idx, (field_ty, field_docs) in enumerate(var.fields):
 921                 java_hu_subclasses = java_hu_subclasses + "\tpublic " + field_ty.arg_name + f": {field_ty.java_hu_ty};\n"
 922                 if field_ty.to_hu_conv is not None:
 923                     hu_conv_body = hu_conv_body + "\t\tconst " + field_ty.arg_name + f": {field_ty.java_ty} = obj." + field_ty.arg_name + ";\n"
 924                     hu_conv_body = hu_conv_body + "\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
 925                     hu_conv_body = hu_conv_body + "\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
 926                 else:
 927                     hu_conv_body = hu_conv_body + "\t\tthis." + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
 928                 if idx > 0:
 929                     init_meth_params += ", "
 930                 init_meth_params += "public " + field_ty.arg_name + ": " + field_ty.java_ty
 931             java_subclasses += "\t\tconstructor(" + init_meth_params + ") { super(); }\n"
 932             java_subclasses += "\t}\n"
 933             java_hu_class += "\t\t}\n"
 934             java_hu_subclasses += "\t/* @internal */\n"
 935             java_hu_subclasses += "\tpublic constructor(ptr: number, obj: bindings." + struct_name + "_" + var.var_name + ") {\n\t\tsuper(null, ptr);\n"
 936             java_hu_subclasses = java_hu_subclasses + hu_conv_body
 937             java_hu_subclasses = java_hu_subclasses + "\t}\n}\n"
 938         out_java += ("\t}\n")
 939         out_java += java_subclasses
 940         java_hu_class += "\t\tthrow new Error('oops, this should be unreachable'); // Unreachable without extending the (internal) bindings interface\n\t}\n\n"
 941         out_java += self.fn_call_body(struct_name + "_ref_from_ptr", "uint32_t", "number", "ptr: number", "ptr")
 942
 943         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")
 944         out_c += ("\t" + struct_name + " *obj = (" + struct_name + "*)(ptr & ~1);\n")
 945         out_c += ("\tswitch(obj->tag) {\n")
 946         for var in variant_list:
 947             out_c += ("\t\tcase " + struct_name + "_" + var.var_name + ": {\n")
 948             c_params = []
 949             for idx, (field_map, _) in enumerate(var.fields):
 950                 if field_map.ret_conv is not None:
 951                     out_c += ("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
 952                     if var.tuple_variant:
 953                         out_c += "obj->" + camel_to_snake(var.var_name)
 954                     else:
 955                         out_c += "obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name
 956                     out_c += (field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
 957                     c_params.append(field_map.ret_conv_name)
 958                 else:
 959                     if var.tuple_variant:
 960                         c_params.append("obj->" + camel_to_snake(var.var_name))
 961                     else:
 962                         c_params.append("obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name)
 963             out_c += ("\t\t\treturn " + self.c_constr_native_complex_enum(struct_name, var.var_name, c_params) + ";\n")
 964             out_c += ("\t\t}\n")
 965         out_c += ("\t\tdefault: abort();\n")
 966         out_c += ("\t}\n}\n")
 967         out_java_enum += java_hu_class
 968         self.struct_file_suffixes[java_hu_type] = java_hu_subclasses
 969         return (out_java, out_java_enum, out_c)
 970
 971     def map_opaque_struct(self, struct_name, struct_doc_comment):
 972         implementations = ""
 973         method_header = ""
 974         if struct_name.startswith("LDKLocked"):
 975             return "NOT IMPLEMENTED"
 976
 977         hu_name = struct_name.replace("LDKC2Tuple", "TwoTuple").replace("LDKC3Tuple", "ThreeTuple").replace("LDK", "")
 978         out_opaque_struct_human = f"""{self.hu_struct_file_prefix}
 979
 980 export class {hu_name} extends CommonBase {implementations}{{
 981         /* @internal */
 982         public constructor(_dummy: object, ptr: number) {{
 983                 super(ptr, bindings.{struct_name.replace("LDK","")}_free);
 984         }}
 985
 986 """
 987         return out_opaque_struct_human
 988
 989     def map_tuple(self, struct_name):
 990         return self.map_opaque_struct(struct_name, "A Tuple")
 991
 992     def fn_call_body(self, method_name, return_c_ty, return_java_ty, method_argument_string, native_call_argument_string):
 993         has_return_value = return_c_ty != 'void'
 994         needs_decoding = return_c_ty in self.wasm_decoding_map
 995         return_statement = 'return nativeResponseValue;'
 996         if not has_return_value:
 997             return_statement = '// debug statements here'
 998         elif needs_decoding:
 999             converter = self.wasm_decoding_map[return_c_ty]
1000             return_statement = f"return {converter}(nativeResponseValue);"
1001
1002         return f"""\texport function {method_name}({method_argument_string}): {return_java_ty} {{
1003                 if(!isWasmInitialized) {{
1004                         throw new Error("initializeWasm() must be awaited first!");
1005                 }}
1006                 const nativeResponseValue = wasm.TS_{method_name}({native_call_argument_string});
1007                 {return_statement}
1008         }}
1009 """
1010     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):
1011         out_java = ""
1012         out_c = ""
1013         out_java_struct = None
1014
1015         out_java += ("\t")
1016         out_c += (self.c_fn_ty_pfx)
1017         out_c += (return_type_info.c_ty)
1018         out_java += (return_type_info.java_ty)
1019         if return_type_info.ret_conv is not None:
1020             ret_conv_pfx, ret_conv_sfx = return_type_info.ret_conv
1021         out_java += (" " + method_name + "(")
1022         out_c += (" "  + self.c_fn_name_define_pfx(method_name, True))
1023
1024         method_argument_string = ""
1025         native_call_argument_string = ""
1026         for idx, arg_conv_info in enumerate(argument_types):
1027             if idx != 0:
1028                 method_argument_string += (", ")
1029                 native_call_argument_string += ', '
1030                 out_c += (", ")
1031             if arg_conv_info.c_ty != "void":
1032                 out_c += (arg_conv_info.c_ty + " " + arg_conv_info.arg_name)
1033                 needs_encoding = arg_conv_info.c_ty in self.wasm_encoding_map
1034                 native_argument = arg_conv_info.arg_name
1035                 if needs_encoding:
1036                     converter = self.wasm_encoding_map[arg_conv_info.c_ty]
1037                     native_argument = f"{converter}({arg_conv_info.arg_name})"
1038                 method_argument_string += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
1039                 native_call_argument_string += native_argument
1040         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)
1041
1042         out_java_struct = ""
1043         if not args_known:
1044             out_java_struct += ("\t// Skipped " + method_name + "\n")
1045         else:
1046             if not takes_self:
1047                 out_java_struct += (
1048                         "\tpublic static constructor_" + meth_n + "(")
1049             else:
1050                 out_java_struct += ("\tpublic " + meth_n + "(")
1051             for idx, arg in enumerate(argument_types):
1052                 if idx != 0:
1053                     if not takes_self or idx > 1:
1054                         out_java_struct += (", ")
1055                 elif takes_self:
1056                     continue
1057                 if arg.java_ty != "void":
1058                     if arg.arg_name in default_constructor_args:
1059                         for explode_idx, explode_arg in enumerate(default_constructor_args[arg.arg_name]):
1060                             if explode_idx != 0:
1061                                 out_java_struct += (", ")
1062                             out_java_struct += arg.arg_name + "_" + explode_arg.arg_name + ": " + explode_arg.java_hu_ty
1063                     else:
1064                         out_java_struct += arg.arg_name + ": " + arg.java_hu_ty
1065
1066         out_c += (") {\n")
1067         if out_java_struct is not None:
1068             out_java_struct += "): " + return_type_info.java_hu_ty + " {\n"
1069         for info in argument_types:
1070             if info.arg_conv is not None:
1071                 out_c += ("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
1072         if return_type_info.ret_conv is not None:
1073             out_c += ("\t" + ret_conv_pfx.replace('\n', '\n\t'))
1074         elif return_type_info.c_ty != "void":
1075             out_c += ("\t" + return_type_info.c_ty + " ret_val = ")
1076         else:
1077             out_c += ("\t")
1078         if c_call_string is None:
1079             out_c += (method_name + "(")
1080         else:
1081             out_c += (c_call_string)
1082         for idx, info in enumerate(argument_types):
1083             if info.arg_conv_name is not None:
1084                 if idx != 0:
1085                     out_c += (", ")
1086                 elif c_call_string is not None:
1087                     continue
1088                 out_c += (info.arg_conv_name)
1089         out_c += (")")
1090         if return_type_info.ret_conv is not None:
1091             out_c += (ret_conv_sfx.replace('\n', '\n\t'))
1092         else:
1093             out_c += (";")
1094         for info in argument_types:
1095             if info.arg_conv_cleanup is not None:
1096                 out_c += ("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
1097         if return_type_info.ret_conv is not None:
1098             out_c += ("\n\treturn " + return_type_info.ret_conv_name + ";")
1099         elif return_type_info.c_ty != "void":
1100             out_c += ("\n\treturn ret_val;")
1101         out_c += ("\n}\n\n")
1102
1103         if args_known:
1104             out_java_struct += ("\t\t")
1105             if return_type_info.java_ty != "void":
1106                 out_java_struct += "const ret: " + return_type_info.java_ty + " = "
1107             out_java_struct += ("bindings." + method_name + "(")
1108             for idx, info in enumerate(argument_types):
1109                 if idx != 0:
1110                     out_java_struct += (", ")
1111                 if idx == 0 and takes_self:
1112                     out_java_struct += ("this.ptr")
1113                 elif info.arg_name in default_constructor_args:
1114                     out_java_struct += ("bindings." + info.java_hu_ty + "_new(")
1115                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
1116                         if explode_idx != 0:
1117                             out_java_struct += (", ")
1118                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1119                         if explode_arg.from_hu_conv is not None:
1120                             out_java_struct += (
1121                                 explode_arg.from_hu_conv[0].replace(explode_arg.arg_name, expl_arg_name))
1122                         else:
1123                             out_java_struct += (expl_arg_name)
1124                     out_java_struct += (")")
1125                 elif info.from_hu_conv is not None:
1126                     out_java_struct += (info.from_hu_conv[0])
1127                 else:
1128                     out_java_struct += (info.arg_name)
1129             out_java_struct += (");\n")
1130             if return_type_info.to_hu_conv is not None:
1131                 if not takes_self:
1132                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t").replace("this",
1133                                                                                                              return_type_info.to_hu_conv_name) + "\n")
1134                 else:
1135                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t") + "\n")
1136
1137             for idx, info in enumerate(argument_types):
1138                 if idx == 0 and takes_self:
1139                     pass
1140                 elif info.arg_name in default_constructor_args:
1141                     for explode_arg in default_constructor_args[info.arg_name]:
1142                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1143                         if explode_arg.from_hu_conv is not None and return_type_info.to_hu_conv_name:
1144                             out_java_struct += ("\t\t" + explode_arg.from_hu_conv[1].replace(explode_arg.arg_name,
1145                                                                                              expl_arg_name).replace(
1146                                 "this", return_type_info.to_hu_conv_name) + ";\n")
1147                 elif info.from_hu_conv is not None and info.from_hu_conv[1] != "":
1148                     if not takes_self and return_type_info.to_hu_conv_name is not None:
1149                         out_java_struct += (
1150                                 "\t\t" + info.from_hu_conv[1].replace("this", return_type_info.to_hu_conv_name).replace("\n", "\n\t\t") + ";\n")
1151                     else:
1152                         out_java_struct += ("\t\t" + info.from_hu_conv[1].replace("\n", "\n\t\t") + ";\n")
1153
1154             if return_type_info.to_hu_conv_name is not None:
1155                 out_java_struct += ("\t\treturn " + return_type_info.to_hu_conv_name + ";\n")
1156             elif return_type_info.java_ty != "void" and return_type_info.rust_obj != "LDK" + struct_meth:
1157                 out_java_struct += ("\t\treturn ret;\n")
1158             out_java_struct += ("\t}\n\n")
1159
1160         return (out_java, out_c, out_java_struct)
1161
1162     def cleanup(self):
1163         for struct in self.struct_file_suffixes:
1164             with open(self.outdir + "/structs/" + struct + self.file_ext, "a") as src:
1165                 src.write(self.struct_file_suffixes[struct])