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