_ 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, **kwargs):
  15
  16         self.c_type_map = dict(
  17             uint8_t = ['number', 'Uint8Array'],
  18             uint16_t = ['number', 'Uint16Array'],
  19             uint32_t = ['number', 'Uint32Array'],
  20             uint64_t = ['number'],
  21         )
  22
  23         self.wasm_decoding_map = dict(
  24             int8_tArray = 'decodeArray'
  25         )
  26
  27         self.wasm_encoding_map = dict(
  28             int8_tArray = 'encodeArray',
  29         )
  30
  31         self.to_hu_conv_templates = dict(
  32             ptr = 'const {var_name}_hu_conv: {human_type} = new {human_type}(null, {var_name});',
  33             default = 'const {var_name}_hu_conv: {human_type} = new {human_type}(null, {var_name});',
  34         )
  35
  36         self.bindings_header = self.wasm_import_header(target) + """
  37 export class VecOrSliceDef {
  38     public dataptr: number;
  39     public datalen: number;
  40     public stride: number;
  41     public constructor(dataptr: number, datalen: number, stride: number) {
  42         this.dataptr = dataptr;
  43         this.datalen = datalen;
  44         this.stride = stride;
  45     }
  46 }
  47
  48 /*
  49 TODO: load WASM file
  50 static {
  51     System.loadLibrary(\"lightningjni\");
  52     init(java.lang.Enum.class, VecOrSliceDef.class);
  53     init_class_cache();
  54 }
  55
  56 static native void init(java.lang.Class c, java.lang.Class slicedef);
  57 static native void init_class_cache();
  58
  59 public static native boolean deref_bool(long ptr);
  60 public static native long deref_long(long ptr);
  61 public static native void free_heap_ptr(long ptr);
  62 public static native byte[] read_bytes(long ptr, long len);
  63 public static native byte[] get_u8_slice_bytes(long slice_ptr);
  64 public static native long bytes_to_u8_vec(byte[] bytes);
  65 public static native long new_txpointer_copy_data(byte[] txdata);
  66 public static native void txpointer_free(long ptr);
  67 public static native byte[] txpointer_get_buffer(long ptr);
  68 public static native long vec_slice_len(long vec);
  69 public static native long new_empty_slice_vec();
  70 */
  71
  72 """
  73
  74         self.bindings_version_file = ""
  75
  76         self.bindings_footer = """
  77         export async function initializeWasm(allowDoubleInitialization: boolean = false): Promise<void> {
  78             if(isWasmInitialized && !allowDoubleInitialization) {
  79                 return;
  80             }
  81             const wasmInstance = await WebAssembly.instantiate(wasmModule, imports)
  82             wasm = wasmInstance.exports;
  83             isWasmInitialized = true;
  84         }
  85         """
  86
  87         self.util_fn_pfx = ""
  88         self.util_fn_sfx = ""
  89
  90         self.common_base = """
  91             export default class CommonBase {
  92                 ptr: number;
  93                 ptrs_to: object[] = []; // new LinkedList(); TODO: build linked list implementation
  94                 protected constructor(ptr: number) { this.ptr = ptr; }
  95                 public _test_only_get_ptr(): number { return this.ptr; }
  96                 protected finalize() {
  97                     // TODO: finalize myself
  98                 }
  99             }
 100 """
 101
 102         self.c_file_pfx = """#include "js-wasm.h"
 103 #include <stdatomic.h>
 104 #include <lightning.h>
 105
 106 // These should be provided...somehow...
 107 void *memset(void *s, int c, size_t n);
 108 void *memcpy(void *dest, const void *src, size_t n);
 109 int memcmp(const void *s1, const void *s2, size_t n);
 110
 111 void __attribute__((noreturn)) abort(void);
 112 static inline void assert(bool expression) {
 113         if (!expression) { abort(); }
 114 }
 115 """
 116
 117         if not DEBUG:
 118             self.c_file_pfx = self.c_file_pfx + """
 119 void *malloc(size_t size);
 120 void free(void *ptr);
 121
 122 #define MALLOC(a, _) malloc(a)
 123 #define FREE(p) if ((unsigned long)(p) > 4096) { free(p); }
 124 #define DO_ASSERT(a) (void)(a)
 125 #define CHECK(a)
 126 #define CHECK_ACCESS(p)
 127 #define CHECK_INNER_FIELD_ACCESS_OR_NULL(v)
 128 """
 129         else:
 130             self.c_file_pfx = self.c_file_pfx + """
 131 // Always run a, then assert it is true:
 132 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
 133 // Assert a is true or do nothing
 134 #define CHECK(a) DO_ASSERT(a)
 135
 136 // Running a leak check across all the allocations and frees of the JDK is a mess,
 137 // so instead we implement our own naive leak checker here, relying on the -wrap
 138 // linker option to wrap malloc/calloc/realloc/free, tracking everyhing allocated
 139 // and free'd in Rust or C across the generated bindings shared library.
 140
 141 #define BT_MAX 128
 142 typedef struct allocation {
 143         struct allocation* next;
 144         void* ptr;
 145         const char* struct_name;
 146 } allocation;
 147 static allocation* allocation_ll = NULL;
 148
 149 void* __real_malloc(size_t len);
 150 void* __real_calloc(size_t nmemb, size_t len);
 151 static void new_allocation(void* res, const char* struct_name) {
 152         allocation* new_alloc = __real_malloc(sizeof(allocation));
 153         new_alloc->ptr = res;
 154         new_alloc->struct_name = struct_name;
 155         new_alloc->next = allocation_ll;
 156         allocation_ll = new_alloc;
 157 }
 158 static void* MALLOC(size_t len, const char* struct_name) {
 159         void* res = __real_malloc(len);
 160         new_allocation(res, struct_name);
 161         return res;
 162 }
 163 void __real_free(void* ptr);
 164 static void alloc_freed(void* ptr) {
 165         allocation* p = NULL;
 166         allocation* it = allocation_ll;
 167         while (it->ptr != ptr) {
 168                 p = it; it = it->next;
 169                 if (it == NULL) {
 170                         //XXX: fprintf(stderr, "Tried to free unknown pointer %p\\n", ptr);
 171                         return; // addrsan should catch malloc-unknown and print more info than we have
 172                 }
 173         }
 174         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
 175         DO_ASSERT(it->ptr == ptr);
 176         __real_free(it);
 177 }
 178 static void FREE(void* ptr) {
 179         if ((unsigned long)ptr <= 4096) return; // Rust loves to create pointers to the NULL page for dummys
 180         alloc_freed(ptr);
 181         __real_free(ptr);
 182 }
 183
 184 static void CHECK_ACCESS(const void* ptr) {
 185         allocation* it = allocation_ll;
 186         while (it->ptr != ptr) {
 187                 it = it->next;
 188                 if (it == NULL) {
 189                         return; // addrsan should catch malloc-unknown and print more info than we have
 190                 }
 191         }
 192 }
 193 #define CHECK_INNER_FIELD_ACCESS_OR_NULL(v) \\
 194         if (v.is_owned && v.inner != NULL) { \\
 195                 const void *p = __unmangle_inner_ptr(v.inner); \\
 196                 if (p != NULL) { \\
 197                         CHECK_ACCESS(p); \\
 198                 } \\
 199         }
 200
 201 void* __wrap_malloc(size_t len) {
 202         void* res = __real_malloc(len);
 203         new_allocation(res, "malloc call");
 204         return res;
 205 }
 206 void* __wrap_calloc(size_t nmemb, size_t len) {
 207         void* res = __real_calloc(nmemb, len);
 208         new_allocation(res, "calloc call");
 209         return res;
 210 }
 211 void __wrap_free(void* ptr) {
 212         if (ptr == NULL) return;
 213         alloc_freed(ptr);
 214         __real_free(ptr);
 215 }
 216
 217 void* __real_realloc(void* ptr, size_t newlen);
 218 void* __wrap_realloc(void* ptr, size_t len) {
 219         if (ptr != NULL) alloc_freed(ptr);
 220         void* res = __real_realloc(ptr, len);
 221         new_allocation(res, "realloc call");
 222         return res;
 223 }
 224 void __wrap_reallocarray(void* ptr, size_t new_sz) {
 225         // Rust doesn't seem to use reallocarray currently
 226         DO_ASSERT(false);
 227 }
 228
 229 void __attribute__((destructor)) check_leaks() {
 230         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 231                 //XXX: fprintf(stderr, "%s %p remains\\n", a->struct_name, a->ptr);
 232         }
 233         DO_ASSERT(allocation_ll == NULL);
 234 }
 235 """
 236         self.c_file_pfx = self.c_file_pfx + """
 237 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
 238 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
 239 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
 240 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
 241
 242 _Static_assert(sizeof(void*) == 4, "Pointers mut be 32 bits");
 243
 244 #define DECL_ARR_TYPE(ty, name) \\
 245         struct name##array { \\
 246                 uint32_t arr_len; \\
 247                 ty elems[]; \\
 248         }; \\
 249         typedef struct name##array * name##Array; \\
 250         static inline name##Array init_##name##Array(size_t arr_len) { \\
 251                 name##Array arr = (name##Array)MALLOC(arr_len * sizeof(ty) + sizeof(uint32_t), "##name array init"); \\
 252                 arr->arr_len = arr_len; \\
 253                 return arr; \\
 254         }
 255
 256 DECL_ARR_TYPE(int64_t, int64_t);
 257 DECL_ARR_TYPE(int8_t, int8_t);
 258 DECL_ARR_TYPE(uint32_t, uint32_t);
 259 DECL_ARR_TYPE(void*, ptr);
 260 DECL_ARR_TYPE(char, char);
 261 typedef charArray jstring;
 262
 263 static inline jstring str_ref_to_ts(const char* chars, size_t len) {
 264         charArray arr = init_charArray(len);
 265         memcpy(arr->elems, chars, len);
 266         return arr;
 267 }
 268 static inline LDKStr str_ref_to_owned_c(const jstring str) {
 269         char* newchars = MALLOC(str->arr_len + 1, "String chars");
 270         memcpy(newchars, str->elems, str->arr_len);
 271         newchars[str->arr_len] = 0;
 272         LDKStr res = {
 273                 .chars = newchars,
 274                 .len = str->arr_len,
 275                 .chars_is_owned = true
 276         };
 277         return res;
 278 }
 279
 280 typedef bool jboolean;
 281
 282 uint32_t __attribute__((visibility("default"))) TS_malloc(uint32_t size) {
 283         return (uint32_t)MALLOC(size, "JS-Called malloc");
 284 }
 285 void __attribute__((visibility("default"))) TS_free(uint32_t ptr) {
 286         FREE((void*)ptr);
 287 }
 288 """
 289
 290         self.c_version_file = ""
 291
 292         self.hu_struct_file_prefix = f"""
 293 import CommonBase from './CommonBase';
 294 import * as bindings from '../bindings' // TODO: figure out location
 295
 296 """
 297         self.c_fn_ty_pfx = ""
 298         self.file_ext = ".ts"
 299         self.ptr_c_ty = "uint32_t"
 300         self.ptr_native_ty = "number"
 301         self.result_c_ty = "uint32_t"
 302         self.ptr_arr = "ptrArray"
 303         self.is_arr_some_check = ("", " != 0")
 304         self.get_native_arr_len_call = ("", "->arr_len")
 305
 306     def release_native_arr_ptr_call(self, ty_info, arr_var, arr_ptr_var):
 307         return None
 308     def create_native_arr_call(self, arr_len, ty_info):
 309         if ty_info.c_ty == "ptrArray":
 310             assert ty_info.subty is not None and ty_info.subty.c_ty.endswith("Array")
 311         return "init_" + ty_info.c_ty + "(" + arr_len + ")"
 312     def set_native_arr_contents(self, arr_name, arr_len, ty_info):
 313         if ty_info.c_ty == "int8_tArray":
 314             return ("memcpy(" + arr_name + "->elems, ", ", " + arr_len + ")")
 315         else:
 316             assert False
 317     def get_native_arr_contents(self, arr_name, dest_name, arr_len, ty_info, copy):
 318         if ty_info.c_ty == "int8_tArray":
 319             if copy:
 320                 return "memcpy(" + dest_name + ", " + arr_name + "->elems, " + arr_len + ")"
 321         if ty_info.c_ty == "ptrArray":
 322             return "(void*) " + arr_name + "->elems"
 323         else:
 324             assert not copy
 325             return arr_name + "->elems"
 326     def get_native_arr_elem(self, arr_name, idxc, ty_info):
 327         assert False # Only called if above is None
 328     def get_native_arr_ptr_call(self, ty_info):
 329         if ty_info.subty is not None:
 330             return "(" + ty_info.subty.c_ty + "*)(", " + 4)"
 331         return "(" + ty_info.c_ty + "*)(", " + 4)"
 332     def get_native_arr_entry_call(self, ty_info, arr_name, idxc, entry_access):
 333         return None
 334     def cleanup_native_arr_ref_contents(self, arr_name, dest_name, arr_len, ty_info):
 335         if ty_info.c_ty == "int8_tArray":
 336             return None
 337         else:
 338             return None
 339
 340     def str_ref_to_native_call(self, var_name, str_len):
 341         return "str_ref_to_ts(" + var_name + ", " + str_len + ")"
 342     def str_ref_to_c_call(self, var_name):
 343         return "str_ref_to_owned_c(" + var_name + ")"
 344
 345     def c_fn_name_define_pfx(self, fn_name, have_args):
 346         return " __attribute__((visibility(\"default\"))) TS_" + fn_name + "("
 347
 348     def wasm_import_header(self, target):
 349         if target == Target.NODEJS:
 350             return """
 351 import * as fs from 'fs';
 352 const source = fs.readFileSync('./ldk.wasm');
 353
 354 const memory = new WebAssembly.Memory({initial: 256});
 355 const wasmModule = new WebAssembly.Module(source);
 356
 357 const imports: any = {};
 358 imports.env = {};
 359
 360 imports.env.memoryBase = 0;
 361 imports.env.memory = memory;
 362 imports.env.tableBase = 0;
 363 imports.env.table = new WebAssembly.Table({initial: 4, element: 'anyfunc'});
 364
 365 imports.env["abort"] = function () {
 366     console.error("ABORT");
 367 };
 368
 369 let wasm = null;
 370 let isWasmInitialized: boolean = false;
 371
 372
 373 // WASM CODEC
 374
 375 const nextMultipleOfFour = (value: number) => {
 376     return Math.ceil(value / 4) * 4;
 377 }
 378
 379 const encodeUint8Array = (inputArray) => {
 380         const cArrayPointer = wasm.TS_malloc(inputArray.length + 4);
 381         const arrayLengthView = new Uint32Array(memory.buffer, cArrayPointer, 1);
 382     arrayLengthView[0] = inputArray.length;
 383         const arrayMemoryView = new Uint8Array(memory.buffer, cArrayPointer + 4, inputArray.length);
 384         arrayMemoryView.set(inputArray);
 385         return cArrayPointer;
 386 }
 387
 388 const encodeUint32Array = (inputArray) => {
 389         const cArrayPointer = wasm.TS_malloc((inputArray.length + 1) * 4);
 390         const arrayMemoryView = new Uint32Array(memory.buffer, cArrayPointer, inputArray.length);
 391         arrayMemoryView.set(inputArray, 1);
 392     arrayMemoryView[0] = inputArray.length;
 393         return cArrayPointer;
 394 }
 395
 396 const getArrayLength = (arrayPointer) => {
 397         const arraySizeViewer = new Uint32Array(
 398                 memory.buffer, // value
 399                 arrayPointer, // offset
 400                 1 // one int
 401         );
 402         return arraySizeViewer[0];
 403 }
 404 const decodeUint8Array = (arrayPointer, free = true) => {
 405         const arraySize = getArrayLength(arrayPointer);
 406         const actualArrayViewer = new Uint8Array(
 407                 memory.buffer, // value
 408                 arrayPointer + 4, // offset (ignoring length bytes)
 409                 arraySize // uint8 count
 410         );
 411         // Clone the contents, TODO: In the future we should wrap the Viewer in a class that
 412         // will free the underlying memory when it becomes unreachable instead of copying here.
 413         const actualArray = actualArrayViewer.slice(0, arraySize);
 414         if (free) {
 415                 wasm.TS_free(arrayPointer);
 416         }
 417         return actualArray;
 418 }
 419 const decodeUint32Array = (arrayPointer, free = true) => {
 420         const arraySize = getArrayLength(arrayPointer);
 421         const actualArrayViewer = new Uint32Array(
 422                 memory.buffer, // value
 423                 arrayPointer + 4, // offset (ignoring length bytes)
 424                 arraySize // uint32 count
 425         );
 426         // Clone the contents, TODO: In the future we should wrap the Viewer in a class that
 427         // will free the underlying memory when it becomes unreachable instead of copying here.
 428         const actualArray = actualArrayViewer.slice(0, arraySize);
 429         if (free) {
 430                 wasm.TS_free(arrayPointer);
 431         }
 432         return actualArray;
 433 }
 434
 435 const encodeString = (string) => {
 436     // make malloc count divisible by 4
 437     const memoryNeed = nextMultipleOfFour(string.length + 1);
 438     const stringPointer = wasm.TS_malloc(memoryNeed);
 439     const stringMemoryView = new Uint8Array(
 440         memory.buffer, // value
 441         stringPointer, // offset
 442         string.length + 1 // length
 443     );
 444     for (let i = 0; i < string.length; i++) {
 445         stringMemoryView[i] = string.charCodeAt(i);
 446     }
 447     stringMemoryView[string.length] = 0;
 448     return stringPointer;
 449 }
 450
 451 const decodeString = (stringPointer, free = true) => {
 452     const memoryView = new Uint8Array(memory.buffer, stringPointer);
 453     let cursor = 0;
 454     let result = '';
 455
 456     while (memoryView[cursor] !== 0) {
 457         result += String.fromCharCode(memoryView[cursor]);
 458         cursor++;
 459     }
 460
 461     if (free) {
 462         wasm.wasm_free(stringPointer);
 463     }
 464
 465     return result;
 466 };
 467 """
 468         return ''
 469
 470     def init_str(self):
 471         return ""
 472
 473     def native_c_unitary_enum_map(self, struct_name, variants, enum_doc_comment):
 474         out_c = "static inline LDK" + struct_name + " LDK" + struct_name + "_from_js(int32_t ord) {\n"
 475         out_c = out_c + "\tswitch (ord) {\n"
 476         ord_v = 0
 477
 478         out_typescript_enum_fields = ""
 479
 480         for var, var_docs in variants:
 481             out_c = out_c + "\t\tcase %d: return %s;\n" % (ord_v, var)
 482             ord_v = ord_v + 1
 483             if var_docs is not None:
 484                 out_typescript_enum_fields += f"/**\n * {var_docs}\n */\n"
 485             out_typescript_enum_fields += f"{var},\n\t\t\t\t"
 486         out_c = out_c + "\t}\n"
 487         out_c = out_c + "\tabort();\n"
 488         out_c = out_c + "}\n"
 489
 490         out_c = out_c + "static inline int32_t LDK" + struct_name + "_to_js(LDK" + struct_name + " val) {\n"
 491         out_c = out_c + "\tswitch (val) {\n"
 492         ord_v = 0
 493         for var, _ in variants:
 494             out_c = out_c + "\t\tcase " + var + ": return %d;\n" % ord_v
 495             ord_v = ord_v + 1
 496         out_c = out_c + "\t\tdefault: abort();\n"
 497         out_c = out_c + "\t}\n"
 498         out_c = out_c + "}\n"
 499
 500         out_typescript_enum = f"""
 501             export enum {struct_name} {{
 502                 {out_typescript_enum_fields}
 503             }}
 504 """
 505
 506         return (out_c, out_typescript_enum, "")
 507
 508     def c_unitary_enum_to_native_call(self, ty_info):
 509         return (ty_info.rust_obj + "_to_js(", ")")
 510     def native_unitary_enum_to_c_call(self, ty_info):
 511         return (ty_info.rust_obj + "_from_js(", ")")
 512
 513     def c_complex_enum_pass_ty(self, struct_name):
 514         return "uint32_t"
 515
 516     def c_constr_native_complex_enum(self, struct_name, variant, c_params):
 517         ret = "0 /* " + struct_name + " - " + variant + " */"
 518         for param in c_params:
 519             ret = ret + "; (void) " + param
 520         return ret
 521
 522     def native_c_map_trait(self, struct_name, field_var_conversions, flattened_field_var_conversions, field_function_lines, trait_doc_comment):
 523         out_typescript_bindings = "\n\n\n// OUT_TYPESCRIPT_BINDINGS :: MAP_TRAIT :: START\n\n"
 524
 525         constructor_arguments = ""
 526         super_instantiator = ""
 527         pointer_to_adder = ""
 528         impl_constructor_arguments = ""
 529         for var in flattened_field_var_conversions:
 530             if isinstance(var, ConvInfo):
 531                 constructor_arguments += f", {first_to_lower(var.arg_name)}?: {var.java_hu_ty}"
 532                 impl_constructor_arguments += f", {var.arg_name}: {var.java_hu_ty}"
 533                 if var.from_hu_conv is not None:
 534                     super_instantiator += ", " + var.from_hu_conv[0]
 535                     if var.from_hu_conv[1] != "":
 536                         pointer_to_adder += var.from_hu_conv[1] + ";\n"
 537                 else:
 538                     super_instantiator += ", " + first_to_lower(var.arg_name)
 539             else:
 540                 constructor_arguments += f", {first_to_lower(var[1])}?: bindings.{var[0]}"
 541                 super_instantiator += ", " + first_to_lower(var[1])
 542                 pointer_to_adder += "this.ptrs_to.push(" + first_to_lower(var[1]) + ");\n"
 543                 impl_constructor_arguments += f", {first_to_lower(var[1])}_impl: {var[0].replace('LDK', '')}.{var[0].replace('LDK', '')}Interface"
 544
 545         # BUILD INTERFACE METHODS
 546         out_java_interface = ""
 547         out_interface_implementation_overrides = ""
 548         java_methods = []
 549         for fn_line in field_function_lines:
 550             java_method_descriptor = ""
 551             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 552                 out_java_interface += fn_line.fn_name + "("
 553                 out_interface_implementation_overrides += f"{fn_line.fn_name} ("
 554
 555                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 556                     if idx >= 1:
 557                         out_java_interface += ", "
 558                         out_interface_implementation_overrides += ", "
 559                     out_java_interface += f"{arg_conv_info.arg_name}: {arg_conv_info.java_hu_ty}"
 560                     out_interface_implementation_overrides += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
 561                     java_method_descriptor += arg_conv_info.java_fn_ty_arg
 562                 out_java_interface += f"): {fn_line.ret_ty_info.java_hu_ty};\n\t\t\t\t"
 563                 java_method_descriptor += ")" + fn_line.ret_ty_info.java_fn_ty_arg
 564                 java_methods.append((fn_line.fn_name, java_method_descriptor))
 565
 566                 out_interface_implementation_overrides += f"): {fn_line.ret_ty_info.java_ty} {{\n"
 567
 568                 interface_method_override_inset = "\t\t\t\t\t\t"
 569                 interface_implementation_inset = "\t\t\t\t\t\t\t"
 570                 for arg_info in fn_line.args_ty:
 571                     if arg_info.to_hu_conv is not None:
 572                         out_interface_implementation_overrides += interface_implementation_inset + arg_info.to_hu_conv.replace("\n", "\n\t\t\t\t") + "\n"
 573
 574                 if fn_line.ret_ty_info.java_ty != "void":
 575                     out_interface_implementation_overrides += interface_implementation_inset + fn_line.ret_ty_info.java_hu_ty + " ret = arg." + fn_line.fn_name + "("
 576                 else:
 577                     out_interface_implementation_overrides += f"{interface_implementation_inset}arg." + fn_line.fn_name + "("
 578
 579                 for idx, arg_info in enumerate(fn_line.args_ty):
 580                     if idx != 0:
 581                         out_interface_implementation_overrides += ", "
 582                     if arg_info.to_hu_conv_name is not None:
 583                         out_interface_implementation_overrides += arg_info.to_hu_conv_name
 584                     else:
 585                         out_interface_implementation_overrides += arg_info.arg_name
 586
 587                 out_interface_implementation_overrides += ");\n"
 588                 if fn_line.ret_ty_info.java_ty != "void":
 589                     if fn_line.ret_ty_info.from_hu_conv is not None:
 590                         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"
 591                         if fn_line.ret_ty_info.from_hu_conv[1] != "":
 592                             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"
 593                         #if fn_line.ret_ty_info.rust_obj in result_types:
 594                         # XXX: We need to handle this in conversion logic so that its cross-language!
 595                         # Avoid double-free by breaking the result - we should learn to clone these and then we can be safe instead
 596                         #    out_interface_implementation_overrides = out_interface_implementation_overrides + "\t\t\t\tret.ptr = 0;\n"
 597                         out_interface_implementation_overrides = out_interface_implementation_overrides + "\t\t\t\treturn result;\n"
 598                     else:
 599                         out_interface_implementation_overrides = out_interface_implementation_overrides + "\t\t\t\treturn ret;\n"
 600                 out_interface_implementation_overrides += f"{interface_method_override_inset}}},\n\n{interface_method_override_inset}"
 601
 602         trait_constructor_arguments = ""
 603         for var in field_var_conversions:
 604             if isinstance(var, ConvInfo):
 605                 trait_constructor_arguments += ", " + var.arg_name
 606             else:
 607                 trait_constructor_arguments += ", " + var[1] + ".new_impl(" + var[1] + "_impl"
 608                 for suparg in var[2]:
 609                     if isinstance(suparg, ConvInfo):
 610                         trait_constructor_arguments += ", " + suparg.arg_name
 611                     else:
 612                         trait_constructor_arguments += ", " + suparg[1]
 613                 trait_constructor_arguments += ").bindings_instance"
 614                 for suparg in var[2]:
 615                     if isinstance(suparg, ConvInfo):
 616                         trait_constructor_arguments += ", " + suparg.arg_name
 617                     else:
 618                         trait_constructor_arguments += ", " + suparg[1]
 619
 620         out_typescript_human = f"""
 621             {self.hu_struct_file_prefix}
 622
 623             export class {struct_name.replace("LDK","")} extends CommonBase {{
 624
 625                 bindings_instance?: bindings.{struct_name};
 626
 627                 constructor(ptr?: number, arg?: bindings.{struct_name}{constructor_arguments}) {{
 628                     if (Number.isFinite(ptr)) {{
 629                                         super(ptr);
 630                                         this.bindings_instance = null;
 631                                     }} else {{
 632                                         // TODO: private constructor instantiation
 633                                         super(bindings.{struct_name}_new(arg{super_instantiator}));
 634                                         this.ptrs_to.push(arg);
 635                                         {pointer_to_adder}
 636                                     }}
 637                 }}
 638
 639                 protected finalize() {{
 640                     if (this.ptr != 0) {{
 641                         bindings.{struct_name.replace("LDK","")}_free(this.ptr);
 642                     }}
 643                     super.finalize();
 644                 }}
 645
 646                 static new_impl(arg: {struct_name.replace("LDK", "")}Interface{impl_constructor_arguments}): {struct_name.replace("LDK", "")} {{
 647                     const impl_holder: {struct_name}Holder = new {struct_name}Holder();
 648                     let structImplementation = <bindings.{struct_name}>{{
 649                         // todo: in-line interface filling
 650                         {out_interface_implementation_overrides}
 651                     }};
 652                     impl_holder.held = new {struct_name.replace("LDK", "")} (null, structImplementation{trait_constructor_arguments});
 653                 }}
 654             }}
 655
 656             export interface {struct_name.replace("LDK", "")}Interface {{
 657                 {out_java_interface}
 658             }}
 659
 660             class {struct_name}Holder {{
 661                 held: {struct_name.replace("LDK", "")};
 662             }}
 663 """
 664
 665         out_typescript_bindings += "\t\texport interface " + struct_name + " {\n"
 666         java_meths = []
 667         for fn_line in field_function_lines:
 668             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 669                 out_typescript_bindings += f"\t\t\t{fn_line.fn_name} ("
 670
 671                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 672                     if idx >= 1:
 673                         out_typescript_bindings = out_typescript_bindings + ", "
 674                     out_typescript_bindings += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
 675
 676                 out_typescript_bindings += f"): {fn_line.ret_ty_info.java_ty};\n"
 677
 678         out_typescript_bindings = out_typescript_bindings + "\t\t}\n\n"
 679
 680         out_typescript_bindings += f"\t\texport function {struct_name}_new(impl: {struct_name}"
 681         for var in flattened_field_var_conversions:
 682             if isinstance(var, ConvInfo):
 683                 out_typescript_bindings += f", {var.arg_name}: {var.java_ty}"
 684             else:
 685                 out_typescript_bindings += f", {var[1]}: {var[0]}"
 686
 687         out_typescript_bindings += f"""): number {{
 688             throw new Error('unimplemented'); // TODO: bind to WASM
 689         }}
 690 """
 691
 692         out_typescript_bindings += '\n// OUT_TYPESCRIPT_BINDINGS :: MAP_TRAIT :: END\n\n\n'
 693
 694         # Now that we've written out our java code (and created java_meths), generate C
 695         out_c = "typedef struct " + struct_name + "_JCalls {\n"
 696         out_c = out_c + "\tatomic_size_t refcnt;\n"
 697         for var in flattened_field_var_conversions:
 698             if isinstance(var, ConvInfo):
 699                 # We're a regular ol' field
 700                 pass
 701             else:
 702                 # We're a supertrait
 703                 out_c = out_c + "\t" + var[0] + "_JCalls* " + var[1] + ";\n"
 704         for fn in field_function_lines:
 705             if fn.fn_name != "free" and fn.fn_name != "cloned":
 706                 out_c = out_c + "\tuint32_t " + fn.fn_name + "_meth;\n"
 707         out_c = out_c + "} " + struct_name + "_JCalls;\n"
 708
 709         for fn_line in field_function_lines:
 710             if fn_line.fn_name == "free":
 711                 out_c = out_c + "static void " + struct_name + "_JCalls_free(void* this_arg) {\n"
 712                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 713                 out_c = out_c + "\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n"
 714                 for fn in field_function_lines:
 715                     if fn.fn_name != "free" and fn.fn_name != "cloned":
 716                         out_c = out_c + "\t\tjs_free(j_calls->" + fn.fn_name + "_meth);\n"
 717                 out_c = out_c + "\t\tFREE(j_calls);\n"
 718                 out_c = out_c + "\t}\n}\n"
 719
 720         for idx, fn_line in enumerate(field_function_lines):
 721             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 722                 assert fn_line.ret_ty_info.ty_info.get_full_rust_ty()[1] == ""
 723                 out_c = out_c + fn_line.ret_ty_info.ty_info.get_full_rust_ty()[0] + " " + fn_line.fn_name + "_" + struct_name + "_jcall("
 724                 if fn_line.self_is_const:
 725                     out_c = out_c + "const void* this_arg"
 726                 else:
 727                     out_c = out_c + "void* this_arg"
 728
 729                 for idx, arg in enumerate(fn_line.args_ty):
 730                     out_c = out_c + ", " + arg.ty_info.get_full_rust_ty()[0] + " " + arg.arg_name + arg.ty_info.get_full_rust_ty()[1]
 731
 732                 out_c = out_c + ") {\n"
 733                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 734
 735                 for arg_info in fn_line.args_ty:
 736                     if arg_info.ret_conv is not None:
 737                         out_c = out_c + "\t" + arg_info.ret_conv[0].replace('\n', '\n\t')
 738                         out_c = out_c + arg_info.arg_name
 739                         out_c = out_c + arg_info.ret_conv[1].replace('\n', '\n\t') + "\n"
 740
 741                 if fn_line.ret_ty_info.c_ty.endswith("Array"):
 742                     out_c += "\t" + fn_line.ret_ty_info.c_ty + " ret = (" + fn_line.ret_ty_info.c_ty + ")"
 743                     out_c += "js_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->" + fn_line.fn_name + "_meth"
 744                 elif fn_line.ret_ty_info.java_ty == "void":
 745                     out_c = out_c + "\tjs_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->" + fn_line.fn_name + "_meth"
 746                 elif fn_line.ret_ty_info.java_ty == "String":
 747                     out_c = out_c + "\tjstring ret = (jstring)js_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->" + fn_line.fn_name + "_meth"
 748                 elif not fn_line.ret_ty_info.passed_as_ptr:
 749                     out_c = out_c + "\treturn js_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->" + fn_line.fn_name + "_meth"
 750                 else:
 751                     out_c = out_c + "\tuint32_t ret = js_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->" + fn_line.fn_name + "_meth"
 752
 753                 for idx, arg_info in enumerate(fn_line.args_ty):
 754                     if arg_info.ret_conv is not None:
 755                         out_c = out_c + ", (uint32_t)" + arg_info.ret_conv_name
 756                     else:
 757                         out_c = out_c + ", (uint32_t)" + arg_info.arg_name
 758                 out_c = out_c + ");\n"
 759                 if fn_line.ret_ty_info.arg_conv is not None:
 760                     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"
 761
 762                 out_c = out_c + "}\n"
 763
 764         # Write out a clone function whether we need one or not, as we use them in moving to rust
 765         out_c = out_c + "static void " + struct_name + "_JCalls_cloned(" + struct_name + "* new_obj) {\n"
 766         out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) new_obj->this_arg;\n"
 767         out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n"
 768         for var in field_var_conversions:
 769             if not isinstance(var, ConvInfo):
 770                 out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->" + var[1] + "->refcnt, 1, memory_order_release);\n"
 771         out_c = out_c + "}\n"
 772
 773         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_init (/*TODO: JS Object Reference */void* o"
 774         for var in flattened_field_var_conversions:
 775             if isinstance(var, ConvInfo):
 776                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 777             else:
 778                 out_c = out_c + ", /*TODO: JS Object Reference */void* " + var[1]
 779         out_c = out_c + ") {\n"
 780
 781         out_c = out_c + "\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n"
 782         out_c = out_c + "\tatomic_init(&calls->refcnt, 1);\n"
 783         out_c = out_c + "\t//TODO: Assign calls->o from o\n"
 784
 785         for (fn_name, java_meth_descr) in java_meths:
 786             if fn_name != "free" and fn_name != "cloned":
 787                 out_c = out_c + "\tcalls->" + fn_name + "_meth = (*env)->GetMethodID(env, c, \"" + fn_name + "\", \"" + java_meth_descr + "\");\n"
 788                 out_c = out_c + "\tCHECK(calls->" + fn_name + "_meth != NULL);\n"
 789
 790         for var in flattened_field_var_conversions:
 791             if isinstance(var, ConvInfo) and var.arg_conv is not None:
 792                 out_c = out_c + "\n\t" + var.arg_conv.replace("\n", "\n\t") +"\n"
 793         out_c = out_c + "\n\t" + struct_name + " ret = {\n"
 794         out_c = out_c + "\t\t.this_arg = (void*) calls,\n"
 795         for fn_line in field_function_lines:
 796             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 797                 out_c = out_c + "\t\t." + fn_line.fn_name + " = " + fn_line.fn_name + "_" + struct_name + "_jcall,\n"
 798             elif fn_line.fn_name == "free":
 799                 out_c = out_c + "\t\t.free = " + struct_name + "_JCalls_free,\n"
 800             else:
 801                 out_c = out_c + "\t\t.cloned = " + struct_name + "_JCalls_cloned,\n"
 802         for var in field_var_conversions:
 803             if isinstance(var, ConvInfo):
 804                 if var.arg_conv_name is not None:
 805                     out_c = out_c + "\t\t." + var.arg_name + " = " + var.arg_conv_name + ",\n"
 806                     out_c = out_c + "\t\t.set_" + var.arg_name + " = NULL,\n"
 807                 else:
 808                     out_c = out_c + "\t\t." + var.var_name + " = " + var.var_name + ",\n"
 809                     out_c = out_c + "\t\t.set_" + var.var_name + " = NULL,\n"
 810             else:
 811                 out_c += "\t\t." + var[1] + " = " + var[0] + "_init(" + var[1]
 812                 for suparg in var[2]:
 813                     if isinstance(suparg, ConvInfo):
 814                         out_c += ", " + suparg.arg_name
 815                     else:
 816                         out_c += ", " + suparg[1]
 817                 out_c += "),\n"
 818         out_c = out_c + "\t};\n"
 819         for var in flattened_field_var_conversions:
 820             if not isinstance(var, ConvInfo):
 821                 out_c = out_c + "\tcalls->" + var[1] + " = ret." + var[1] + ".this_arg;\n"
 822         out_c = out_c + "\treturn ret;\n"
 823         out_c = out_c + "}\n"
 824
 825         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"
 826         for var in flattened_field_var_conversions:
 827             if isinstance(var, ConvInfo):
 828                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 829             else:
 830                 out_c = out_c + ", /*TODO: JS Object Reference */ void* " + var[1]
 831         out_c = out_c + ") {\n"
 832         out_c = out_c + "\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n"
 833         out_c = out_c + "\t*res_ptr = " + struct_name + "_init(o"
 834         for var in flattened_field_var_conversions:
 835             if isinstance(var, ConvInfo):
 836                 out_c = out_c + ", " + var.arg_name
 837             else:
 838                 out_c = out_c + ", " + var[1]
 839         out_c = out_c + ");\n"
 840         out_c = out_c + "\treturn (long)res_ptr;\n"
 841         out_c = out_c + "}\n"
 842
 843         return (out_typescript_bindings, out_typescript_human, out_c)
 844
 845     def trait_struct_inc_refcnt(self, ty_info):
 846         return ""
 847
 848     def map_complex_enum(self, struct_name, variant_list, camel_to_snake, enum_doc_comment):
 849         java_hu_type = struct_name.replace("LDK", "")
 850
 851         out_java_enum = ""
 852         out_java = ""
 853         out_c = ""
 854
 855         out_java_enum += (self.hu_struct_file_prefix)
 856         out_java_enum += ("export default class " + java_hu_type + " extends CommonBase {\n")
 857         out_java_enum += ("\tprotected constructor(_dummy: object, ptr: number) { super(ptr); }\n")
 858         out_java_enum += ("\tprotected finalize() {\n")
 859         out_java_enum += ("\t\tsuper.finalize();\n")
 860         out_java_enum += ("\t\tif (this.ptr != 0) { bindings." + java_hu_type + "_free(this.ptr); }\n")
 861         out_java_enum += ("\t}\n")
 862         out_java_enum += f"\tstatic constr_from_ptr(ptr: number): {java_hu_type} {{\n"
 863         out_java_enum += (f"\t\tconst raw_val: bindings.{struct_name} = bindings." + struct_name + "_ref_from_ptr(ptr);\n")
 864         java_hu_subclasses = ""
 865
 866         out_java +=  ("\tpublic static class " + struct_name + " {\n")
 867         out_java +=  ("\t\tprivate " + struct_name + "() {}\n")
 868         for var in variant_list:
 869             out_java +=  ("\t\texport class " + var.var_name + " extends " + struct_name + " {\n")
 870             java_hu_subclasses = java_hu_subclasses + "export class " + var.var_name + " extends " + java_hu_type + " {\n"
 871             out_java_enum += ("\t\tif (raw_val instanceof bindings." + struct_name + "." + var.var_name + ") {\n")
 872             out_java_enum += ("\t\t\treturn new " + var.var_name + "(this.ptr, raw_val);\n")
 873             init_meth_params = ""
 874             init_meth_body = ""
 875             hu_conv_body = ""
 876             for idx, (field_ty, field_docs) in enumerate(var.fields):
 877                 out_java += ("\t\t\tpublic " + field_ty.java_ty + " " + field_ty.arg_name + ";\n")
 878                 java_hu_subclasses = java_hu_subclasses + "\tpublic " + field_ty.arg_name + f": {field_ty.java_hu_ty};\n"
 879                 if field_ty.to_hu_conv is not None:
 880                     hu_conv_body = hu_conv_body + "\t\tconst " + field_ty.arg_name + f": {field_ty.java_ty} = obj." + field_ty.arg_name + ";\n"
 881                     hu_conv_body = hu_conv_body + "\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
 882                     hu_conv_body = hu_conv_body + "\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
 883                 else:
 884                     hu_conv_body = hu_conv_body + "\t\tthis." + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
 885                 if idx > 0:
 886                     init_meth_params = init_meth_params + ", "
 887                 init_meth_params = init_meth_params + field_ty.java_ty + " " + field_ty.arg_name
 888                 init_meth_body = init_meth_body + "this." + field_ty.arg_name + " = " + field_ty.arg_name + "; "
 889             out_java +=  ("\t\t\t" + var.var_name + "(" + init_meth_params + ") { ")
 890             out_java +=  (init_meth_body)
 891             out_java +=  ("}\n")
 892             out_java += ("\t\t}\n")
 893             out_java_enum += ("\t\t}\n")
 894             java_hu_subclasses = java_hu_subclasses + "\tprivate constructor(ptr: number, obj: bindings." + struct_name + "." + var.var_name + ") {\n\t\tsuper(null, ptr);\n"
 895             java_hu_subclasses = java_hu_subclasses + hu_conv_body
 896             java_hu_subclasses = java_hu_subclasses + "\t}\n}\n"
 897         out_java += ("\t\tstatic native void init();\n")
 898         out_java += ("\t}\n")
 899         out_java_enum += ("\t\tthrow new Error('oops, this should be unreachable'); // Unreachable without extending the (internal) bindings interface\n\t}\n\n")
 900         out_java += ("\tstatic { " + struct_name + ".init(); }\n")
 901         out_java += ("\tpublic static native " + struct_name + " " + struct_name + "_ref_from_ptr(long ptr);\n");
 902
 903         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")
 904         out_c += ("\t" + struct_name + " *obj = (" + struct_name + "*)(ptr & ~1);\n")
 905         out_c += ("\tswitch(obj->tag) {\n")
 906         for var in variant_list:
 907             out_c += ("\t\tcase " + struct_name + "_" + var.var_name + ": {\n")
 908             c_params = []
 909             for idx, (field_map, _) in enumerate(var.fields):
 910                 if field_map.ret_conv is not None:
 911                     out_c += ("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
 912                     if var.tuple_variant:
 913                         out_c += "obj->" + camel_to_snake(var.var_name)
 914                     else:
 915                         out_c += "obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name
 916                     out_c += (field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
 917                     c_params.append(field_map.ret_conv_name)
 918                 else:
 919                     if var.tuple_variant:
 920                         c_params.append("obj->" + camel_to_snake(var.var_name))
 921                     else:
 922                         c_params.append("obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name)
 923             out_c += ("\t\t\treturn " + self.c_constr_native_complex_enum(struct_name, var.var_name, c_params) + ";\n")
 924             out_c += ("\t\t}\n")
 925         out_c += ("\t\tdefault: abort();\n")
 926         out_c += ("\t}\n}\n")
 927         out_java_enum += ("}\n")
 928         out_java_enum += (java_hu_subclasses)
 929         return (out_java, out_java_enum, out_c)
 930
 931     def map_opaque_struct(self, struct_name, struct_doc_comment):
 932         implementations = ""
 933         method_header = ""
 934         if struct_name.startswith("LDKLocked"):
 935             implementations += "implements AutoCloseable "
 936             method_header = """
 937                 public close() {
 938 """
 939         else:
 940             method_header = """
 941                 protected finalize() {
 942                     super.finalize();
 943 """
 944
 945         out_opaque_struct_human = f"""
 946             {self.hu_struct_file_prefix}
 947
 948             export default class {struct_name.replace("LDK","")} extends CommonBase {implementations}{{
 949                 constructor(_dummy: object, ptr: number) {{
 950                     super(ptr);
 951                 }}
 952
 953                 {method_header}
 954                     if (this.ptr != 0) {{
 955                         bindings.{struct_name.replace("LDK","")}_free(this.ptr);
 956                     }}
 957                 }}
 958 """
 959         return out_opaque_struct_human
 960
 961     def map_tuple(self, struct_name):
 962         return self.map_opaque_struct(struct_name, "A Tuple")
 963
 964     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):
 965         out_java = ""
 966         out_c = ""
 967         out_java_struct = None
 968
 969         out_java += ("\tpublic static native ")
 970         out_c += (self.c_fn_ty_pfx)
 971         out_c += (return_type_info.c_ty)
 972         out_java += (return_type_info.java_ty)
 973         if return_type_info.ret_conv is not None:
 974             ret_conv_pfx, ret_conv_sfx = return_type_info.ret_conv
 975         out_java += (" " + method_name + "(")
 976         out_c += (" "  + self.c_fn_name_define_pfx(method_name, True))
 977
 978         method_argument_string = ""
 979         native_call_argument_string = ""
 980         for idx, arg_conv_info in enumerate(argument_types):
 981             if idx != 0:
 982                 method_argument_string += (", ")
 983                 native_call_argument_string += ', '
 984                 out_c += (", ")
 985             if arg_conv_info.c_ty != "void":
 986                 out_c += (arg_conv_info.c_ty + " " + arg_conv_info.arg_name)
 987                 needs_encoding = arg_conv_info.c_ty in self.wasm_encoding_map
 988                 native_argument = arg_conv_info.arg_name
 989                 if needs_encoding:
 990                     converter = self.wasm_encoding_map[arg_conv_info.c_ty]
 991                     native_argument = f"{converter}({arg_conv_info.arg_name})"
 992                 method_argument_string += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
 993                 native_call_argument_string += native_argument
 994
 995         has_return_value = return_type_info.c_ty != 'void'
 996         needs_decoding = return_type_info.c_ty in self.wasm_decoding_map
 997         return_statement = 'return nativeResponseValue;'
 998         if not has_return_value:
 999             return_statement = '// debug statements here'
1000         elif needs_decoding:
1001             converter = self.wasm_decoding_map[return_type_info.c_ty]
1002             return_statement = f"return {converter}(nativeResponseValue);"
1003
1004         out_java = f"""\texport function {method_name}({method_argument_string}): {return_type_info.java_ty} {{
1005                 if(!isWasmInitialized) {{
1006                         throw new Error("initializeWasm() must be awaited first!");
1007                 }}
1008                 const nativeResponseValue = wasm.{method_name}({native_call_argument_string});
1009                 {return_statement}
1010         }}
1011 """
1012
1013         out_java_struct = ""
1014         if not args_known:
1015             out_java_struct += ("\t// Skipped " + method_name + "\n")
1016         else:
1017             if not takes_self:
1018                 out_java_struct += (
1019                         "\tpublic static " + return_type_info.java_hu_ty + " constructor_" + meth_n + "(")
1020             else:
1021                 out_java_struct += ("\tpublic " + return_type_info.java_hu_ty + " " + meth_n + "(")
1022             for idx, arg in enumerate(argument_types):
1023                 if idx != 0:
1024                     if not takes_self or idx > 1:
1025                         out_java_struct += (", ")
1026                 elif takes_self:
1027                     continue
1028                 if arg.java_ty != "void":
1029                     if arg.arg_name in default_constructor_args:
1030                         for explode_idx, explode_arg in enumerate(default_constructor_args[arg.arg_name]):
1031                             if explode_idx != 0:
1032                                 out_java_struct += (", ")
1033                             out_java_struct += (
1034                                     explode_arg.java_hu_ty + " " + arg.arg_name + "_" + explode_arg.arg_name)
1035                     else:
1036                         out_java_struct += (arg.java_hu_ty + " " + arg.arg_name)
1037
1038         out_c += (") {\n")
1039         if out_java_struct is not None:
1040             out_java_struct += (") {\n")
1041         for info in argument_types:
1042             if info.arg_conv is not None:
1043                 out_c += ("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
1044         if return_type_info.ret_conv is not None:
1045             out_c += ("\t" + ret_conv_pfx.replace('\n', '\n\t'))
1046         elif return_type_info.c_ty != "void":
1047             out_c += ("\t" + return_type_info.c_ty + " ret_val = ")
1048         else:
1049             out_c += ("\t")
1050         if c_call_string is None:
1051             out_c += (method_name + "(")
1052         else:
1053             out_c += (c_call_string)
1054         for idx, info in enumerate(argument_types):
1055             if info.arg_conv_name is not None:
1056                 if idx != 0:
1057                     out_c += (", ")
1058                 elif c_call_string is not None:
1059                     continue
1060                 out_c += (info.arg_conv_name)
1061         out_c += (")")
1062         if return_type_info.ret_conv is not None:
1063             out_c += (ret_conv_sfx.replace('\n', '\n\t'))
1064         else:
1065             out_c += (";")
1066         for info in argument_types:
1067             if info.arg_conv_cleanup is not None:
1068                 out_c += ("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
1069         if return_type_info.ret_conv is not None:
1070             out_c += ("\n\treturn " + return_type_info.ret_conv_name + ";")
1071         elif return_type_info.c_ty != "void":
1072             out_c += ("\n\treturn ret_val;")
1073         out_c += ("\n}\n\n")
1074
1075         if args_known:
1076             out_java_struct += ("\t\t")
1077             if return_type_info.java_ty != "void":
1078                 out_java_struct += (return_type_info.java_ty + " ret = ")
1079             out_java_struct += ("bindings." + method_name + "(")
1080             for idx, info in enumerate(argument_types):
1081                 if idx != 0:
1082                     out_java_struct += (", ")
1083                 if idx == 0 and takes_self:
1084                     out_java_struct += ("this.ptr")
1085                 elif info.arg_name in default_constructor_args:
1086                     out_java_struct += ("bindings." + info.java_hu_ty + "_new(")
1087                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
1088                         if explode_idx != 0:
1089                             out_java_struct += (", ")
1090                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1091                         if explode_arg.from_hu_conv is not None:
1092                             out_java_struct += (
1093                                 explode_arg.from_hu_conv[0].replace(explode_arg.arg_name, expl_arg_name))
1094                         else:
1095                             out_java_struct += (expl_arg_name)
1096                     out_java_struct += (")")
1097                 elif info.from_hu_conv is not None:
1098                     out_java_struct += (info.from_hu_conv[0])
1099                 else:
1100                     out_java_struct += (info.arg_name)
1101             out_java_struct += (");\n")
1102             if return_type_info.to_hu_conv is not None:
1103                 if not takes_self:
1104                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t").replace("this",
1105                                                                                                              return_type_info.to_hu_conv_name) + "\n")
1106                 else:
1107                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t") + "\n")
1108
1109             for idx, info in enumerate(argument_types):
1110                 if idx == 0 and takes_self:
1111                     pass
1112                 elif info.arg_name in default_constructor_args:
1113                     for explode_arg in default_constructor_args[info.arg_name]:
1114                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1115                         if explode_arg.from_hu_conv is not None and return_type_info.to_hu_conv_name:
1116                             out_java_struct += ("\t\t" + explode_arg.from_hu_conv[1].replace(explode_arg.arg_name,
1117                                                                                              expl_arg_name).replace(
1118                                 "this", return_type_info.to_hu_conv_name) + ";\n")
1119                 elif info.from_hu_conv is not None and info.from_hu_conv[1] != "":
1120                     if not takes_self and return_type_info.to_hu_conv_name is not None:
1121                         out_java_struct += (
1122                                 "\t\t" + info.from_hu_conv[1].replace("this", return_type_info.to_hu_conv_name).replace("\n", "\n\t\t") + ";\n")
1123                     else:
1124                         out_java_struct += ("\t\t" + info.from_hu_conv[1].replace("\n", "\n\t\t") + ";\n")
1125
1126             if return_type_info.to_hu_conv_name is not None:
1127                 out_java_struct += ("\t\treturn " + return_type_info.to_hu_conv_name + ";\n")
1128             elif return_type_info.java_ty != "void" and return_type_info.rust_obj != "LDK" + struct_meth:
1129                 out_java_struct += ("\t\treturn ret;\n")
1130             out_java_struct += ("\t}\n\n")
1131
1132         return (out_java, out_c, out_java_struct)