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