_ 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) > 1024) { free(p); }
 124 #define DO_ASSERT(a) (void)(a)
 125 #define CHECK(a)
 126 #define CHECK_ACCESS(p)
 127 """
 128         else:
 129             self.c_file_pfx = self.c_file_pfx + """
 130 // Always run a, then assert it is true:
 131 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
 132 // Assert a is true or do nothing
 133 #define CHECK(a) DO_ASSERT(a)
 134
 135 // Running a leak check across all the allocations and frees of the JDK is a mess,
 136 // so instead we implement our own naive leak checker here, relying on the -wrap
 137 // linker option to wrap malloc/calloc/realloc/free, tracking everyhing allocated
 138 // and free'd in Rust or C across the generated bindings shared library.
 139
 140 #define BT_MAX 128
 141 typedef struct allocation {
 142         struct allocation* next;
 143         void* ptr;
 144         const char* struct_name;
 145 } allocation;
 146 static allocation* allocation_ll = NULL;
 147
 148 void* __real_malloc(size_t len);
 149 void* __real_calloc(size_t nmemb, size_t len);
 150 static void new_allocation(void* res, const char* struct_name) {
 151         allocation* new_alloc = __real_malloc(sizeof(allocation));
 152         new_alloc->ptr = res;
 153         new_alloc->struct_name = struct_name;
 154         new_alloc->next = allocation_ll;
 155         allocation_ll = new_alloc;
 156 }
 157 static void* MALLOC(size_t len, const char* struct_name) {
 158         void* res = __real_malloc(len);
 159         new_allocation(res, struct_name);
 160         return res;
 161 }
 162 void __real_free(void* ptr);
 163 static void alloc_freed(void* ptr) {
 164         allocation* p = NULL;
 165         allocation* it = allocation_ll;
 166         while (it->ptr != ptr) {
 167                 p = it; it = it->next;
 168                 if (it == NULL) {
 169                         //XXX: fprintf(stderr, "Tried to free unknown pointer %p\\n", ptr);
 170                         return; // addrsan should catch malloc-unknown and print more info than we have
 171                 }
 172         }
 173         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
 174         DO_ASSERT(it->ptr == ptr);
 175         __real_free(it);
 176 }
 177 static void FREE(void* ptr) {
 178         if ((unsigned long)ptr < 1024) return; // Rust loves to create pointers to the NULL page for dummys
 179         alloc_freed(ptr);
 180         __real_free(ptr);
 181 }
 182
 183 static void CHECK_ACCESS(void* ptr) {
 184         allocation* it = allocation_ll;
 185         while (it->ptr != ptr) {
 186                 it = it->next;
 187                 if (it == NULL) {
 188                         return; // addrsan should catch malloc-unknown and print more info than we have
 189                 }
 190         }
 191 }
 192
 193 void* __wrap_malloc(size_t len) {
 194         void* res = __real_malloc(len);
 195         new_allocation(res, "malloc call");
 196         return res;
 197 }
 198 void* __wrap_calloc(size_t nmemb, size_t len) {
 199         void* res = __real_calloc(nmemb, len);
 200         new_allocation(res, "calloc call");
 201         return res;
 202 }
 203 void __wrap_free(void* ptr) {
 204         if (ptr == NULL) return;
 205         alloc_freed(ptr);
 206         __real_free(ptr);
 207 }
 208
 209 void* __real_realloc(void* ptr, size_t newlen);
 210 void* __wrap_realloc(void* ptr, size_t len) {
 211         if (ptr != NULL) alloc_freed(ptr);
 212         void* res = __real_realloc(ptr, len);
 213         new_allocation(res, "realloc call");
 214         return res;
 215 }
 216 void __wrap_reallocarray(void* ptr, size_t new_sz) {
 217         // Rust doesn't seem to use reallocarray currently
 218         DO_ASSERT(false);
 219 }
 220
 221 void __attribute__((destructor)) check_leaks() {
 222         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 223                 //XXX: fprintf(stderr, "%s %p remains\\n", a->struct_name, a->ptr);
 224         }
 225         DO_ASSERT(allocation_ll == NULL);
 226 }
 227 """
 228         self.c_file_pfx = self.c_file_pfx + """
 229 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
 230 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
 231 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
 232 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
 233
 234 _Static_assert(sizeof(void*) == 4, "Pointers mut be 32 bits");
 235
 236 typedef uint32_t int64_tArray;
 237 typedef uint32_t int8_tArray;
 238 typedef uint32_t uint32_tArray;
 239 typedef uint32_t ptrArray;
 240 typedef uint32_t jstring;
 241
 242 static inline uint32_t init_arr(size_t arr_len, size_t elem_size, const char *type_desc) {
 243         uint32_t *elems = (uint32_t*)MALLOC(arr_len * elem_size + 4, type_desc);
 244         elems[0] = arr_len;
 245         return (uint32_t)elems;
 246 }
 247
 248 static inline jstring str_ref_to_ts(const char* chars, size_t len) {
 249         char* err_buf = MALLOC(len + 4, "str conv buf");
 250         *((uint32_t*)err_buf) = len;
 251         memcpy(err_buf + 4, chars, len);
 252         return (uint32_t) err_buf;
 253 }
 254 static inline LDKStr str_ref_to_owned_c(jstring str) {
 255         uint32_t *str_len = (uint32_t*)str;
 256         char* newchars = MALLOC(*str_len + 1, "String chars");
 257         memcpy(newchars, (const char*)(str + 4), *str_len);
 258         newchars[*str_len] = 0;
 259         LDKStr res= {
 260                 .chars = newchars,
 261                 .len = *str_len,
 262                 .chars_is_owned = true
 263         };
 264         return res;
 265 }
 266
 267 typedef bool jboolean;
 268
 269 uint32_t __attribute__((visibility("default"))) TS_malloc(uint32_t size) {
 270         return (uint32_t)MALLOC(size, "JS-Called malloc");
 271 }
 272 void __attribute__((visibility("default"))) TS_free(uint32_t ptr) {
 273         FREE((void*)ptr);
 274 }
 275 """
 276
 277         self.c_version_file = ""
 278
 279         self.hu_struct_file_prefix = f"""
 280 import CommonBase from './CommonBase';
 281 import * as bindings from '../bindings' // TODO: figure out location
 282
 283 """
 284         self.c_fn_ty_pfx = ""
 285         self.file_ext = ".ts"
 286         self.ptr_c_ty = "uint32_t"
 287         self.ptr_native_ty = "number"
 288         self.result_c_ty = "uint32_t"
 289         self.ptr_arr = "ptrArray"
 290         self.is_arr_some_check = ("", " != 0")
 291         self.get_native_arr_len_call = ("*((uint32_t*)", ")")
 292
 293     def release_native_arr_ptr_call(self, ty_info, arr_var, arr_ptr_var):
 294         return None
 295     def create_native_arr_call(self, arr_len, ty_info):
 296         if ty_info.c_ty == "int8_tArray":
 297             return "init_arr(" + arr_len + ", sizeof(uint8_t), \"Native int8_tArray Bytes\")"
 298         elif ty_info.c_ty == "int64_tArray":
 299             return "init_arr(" + arr_len + ", sizeof(uint64_t), \"Native int64_tArray Bytes\")"
 300         elif ty_info.c_ty == "uint32_tArray":
 301             return "init_arr(" + arr_len + ", sizeof(uint32_t), \"Native uint32_tArray Bytes\")"
 302         elif ty_info.c_ty == "ptrArray":
 303             assert ty_info.subty is not None and ty_info.subty.c_ty.endswith("Array")
 304             return "init_arr(" + arr_len + ", sizeof(uint32_t), \"Native ptrArray Bytes\")"
 305         else:
 306             print("Need to create arr!", ty_info.c_ty)
 307             return ty_info.c_ty
 308     def set_native_arr_contents(self, arr_name, arr_len, ty_info):
 309         if ty_info.c_ty == "int8_tArray":
 310             return ("memcpy((uint8_t*)(" + arr_name + " + 4), ", ", " + arr_len + ")")
 311         else:
 312             assert False
 313     def get_native_arr_contents(self, arr_name, dest_name, arr_len, ty_info, copy):
 314         if ty_info.c_ty == "int8_tArray":
 315             if copy:
 316                 return "memcpy(" + dest_name + ", (uint8_t*)(" + arr_name + " + 4), " + arr_len + ")"
 317             else:
 318                 return "(int8_t*)(" + arr_name + " + 4)"
 319         else:
 320             return "(" + ty_info.subty.c_ty + "*)(" + arr_name + " + 4)"
 321     def get_native_arr_elem(self, arr_name, idxc, ty_info):
 322         assert False # Only called if above is None
 323     def get_native_arr_ptr_call(self, ty_info):
 324         if ty_info.subty is not None:
 325             return "(" + ty_info.subty.c_ty + "*)(", " + 4)"
 326         return "(" + ty_info.c_ty + "*)(", " + 4)"
 327     def get_native_arr_entry_call(self, ty_info, arr_name, idxc, entry_access):
 328         return None
 329     def cleanup_native_arr_ref_contents(self, arr_name, dest_name, arr_len, ty_info):
 330         if ty_info.c_ty == "int8_tArray":
 331             return None
 332         else:
 333             return None
 334
 335     def str_ref_to_native_call(self, var_name, str_len):
 336         return "str_ref_to_ts(" + var_name + ", " + str_len + ")"
 337     def str_ref_to_c_call(self, var_name):
 338         return "str_ref_to_owned_c(" + var_name + ")"
 339
 340     def c_fn_name_define_pfx(self, fn_name, have_args):
 341         return " __attribute__((visibility(\"default\"))) TS_" + fn_name + "("
 342
 343     def wasm_import_header(self, target):
 344         if target == Target.NODEJS:
 345             return """
 346 import * as fs from 'fs';
 347 const source = fs.readFileSync('./ldk.wasm');
 348
 349 const memory = new WebAssembly.Memory({initial: 256});
 350 const wasmModule = new WebAssembly.Module(source);
 351
 352 const imports: any = {};
 353 imports.env = {};
 354
 355 imports.env.memoryBase = 0;
 356 imports.env.memory = memory;
 357 imports.env.tableBase = 0;
 358 imports.env.table = new WebAssembly.Table({initial: 4, element: 'anyfunc'});
 359
 360 imports.env["abort"] = function () {
 361     console.error("ABORT");
 362 };
 363
 364 let wasm = null;
 365 let isWasmInitialized: boolean = false;
 366
 367
 368 // WASM CODEC
 369
 370 const nextMultipleOfFour = (value: number) => {
 371     return Math.ceil(value / 4) * 4;
 372 }
 373
 374 const encodeUint8Array = (inputArray) => {
 375         const cArrayPointer = wasm.TS_malloc(inputArray.length + 4);
 376         const arrayLengthView = new Uint32Array(memory.buffer, cArrayPointer, 1);
 377     arrayLengthView[0] = inputArray.length;
 378         const arrayMemoryView = new Uint8Array(memory.buffer, cArrayPointer + 4, inputArray.length);
 379         arrayMemoryView.set(inputArray);
 380         return cArrayPointer;
 381 }
 382
 383 const encodeUint32Array = (inputArray) => {
 384         const cArrayPointer = wasm.TS_malloc((inputArray.length + 1) * 4);
 385         const arrayMemoryView = new Uint32Array(memory.buffer, cArrayPointer, inputArray.length);
 386         arrayMemoryView.set(inputArray, 1);
 387     arrayMemoryView[0] = inputArray.length;
 388         return cArrayPointer;
 389 }
 390
 391 const getArrayLength = (arrayPointer) => {
 392         const arraySizeViewer = new Uint32Array(
 393                 memory.buffer, // value
 394                 arrayPointer, // offset
 395                 1 // one int
 396         );
 397         return arraySizeViewer[0];
 398 }
 399 const decodeUint8Array = (arrayPointer, free = true) => {
 400         const arraySize = getArrayLength(arrayPointer);
 401         const actualArrayViewer = new Uint8Array(
 402                 memory.buffer, // value
 403                 arrayPointer + 4, // offset (ignoring length bytes)
 404                 arraySize // uint8 count
 405         );
 406         // Clone the contents, TODO: In the future we should wrap the Viewer in a class that
 407         // will free the underlying memory when it becomes unreachable instead of copying here.
 408         const actualArray = actualArrayViewer.slice(0, arraySize);
 409         if (free) {
 410                 wasm.TS_free(arrayPointer);
 411         }
 412         return actualArray;
 413 }
 414 const decodeUint32Array = (arrayPointer, free = true) => {
 415         const arraySize = getArrayLength(arrayPointer);
 416         const actualArrayViewer = new Uint32Array(
 417                 memory.buffer, // value
 418                 arrayPointer + 4, // offset (ignoring length bytes)
 419                 arraySize // uint32 count
 420         );
 421         // Clone the contents, TODO: In the future we should wrap the Viewer in a class that
 422         // will free the underlying memory when it becomes unreachable instead of copying here.
 423         const actualArray = actualArrayViewer.slice(0, arraySize);
 424         if (free) {
 425                 wasm.TS_free(arrayPointer);
 426         }
 427         return actualArray;
 428 }
 429
 430 const encodeString = (string) => {
 431     // make malloc count divisible by 4
 432     const memoryNeed = nextMultipleOfFour(string.length + 1);
 433     const stringPointer = wasm.TS_malloc(memoryNeed);
 434     const stringMemoryView = new Uint8Array(
 435         memory.buffer, // value
 436         stringPointer, // offset
 437         string.length + 1 // length
 438     );
 439     for (let i = 0; i < string.length; i++) {
 440         stringMemoryView[i] = string.charCodeAt(i);
 441     }
 442     stringMemoryView[string.length] = 0;
 443     return stringPointer;
 444 }
 445
 446 const decodeString = (stringPointer, free = true) => {
 447     const memoryView = new Uint8Array(memory.buffer, stringPointer);
 448     let cursor = 0;
 449     let result = '';
 450
 451     while (memoryView[cursor] !== 0) {
 452         result += String.fromCharCode(memoryView[cursor]);
 453         cursor++;
 454     }
 455
 456     if (free) {
 457         wasm.wasm_free(stringPointer);
 458     }
 459
 460     return result;
 461 };
 462 """
 463         return ''
 464
 465     def init_str(self):
 466         return ""
 467
 468     def native_c_unitary_enum_map(self, struct_name, variants, enum_doc_comment):
 469         out_c = "static inline LDK" + struct_name + " LDK" + struct_name + "_from_js(int32_t ord) {\n"
 470         out_c = out_c + "\tswitch (ord) {\n"
 471         ord_v = 0
 472
 473         out_typescript_enum_fields = ""
 474
 475         for var in variants:
 476             out_c = out_c + "\t\tcase %d: return %s;\n" % (ord_v, var)
 477             ord_v = ord_v + 1
 478             out_typescript_enum_fields += f"{var},\n\t\t\t\t"
 479         out_c = out_c + "\t}\n"
 480         out_c = out_c + "\tabort();\n"
 481         out_c = out_c + "}\n"
 482
 483         out_c = out_c + "static inline int32_t LDK" + struct_name + "_to_js(LDK" + struct_name + " val) {\n"
 484         out_c = out_c + "\tswitch (val) {\n"
 485         ord_v = 0
 486         for var in variants:
 487             out_c = out_c + "\t\tcase " + var + ": return %d;\n" % ord_v
 488             ord_v = ord_v + 1
 489         out_c = out_c + "\t\tdefault: abort();\n"
 490         out_c = out_c + "\t}\n"
 491         out_c = out_c + "}\n"
 492
 493         out_typescript_enum = f"""
 494             export enum {struct_name} {{
 495                 {out_typescript_enum_fields}
 496             }}
 497 """
 498
 499         return (out_c, out_typescript_enum, "")
 500
 501     def c_unitary_enum_to_native_call(self, ty_info):
 502         return (ty_info.rust_obj + "_to_js(", ")")
 503     def native_unitary_enum_to_c_call(self, ty_info):
 504         return (ty_info.rust_obj + "_from_js(", ")")
 505
 506     def c_complex_enum_pass_ty(self, struct_name):
 507         return "uint32_t"
 508
 509     def c_constr_native_complex_enum(self, struct_name, variant, c_params):
 510         ret = "0 /* " + struct_name + " - " + variant + " */"
 511         for param in c_params:
 512             ret = ret + "; (void) " + param
 513         return ret
 514
 515     def native_c_map_trait(self, struct_name, field_var_conversions, flattened_field_var_conversions, field_function_lines, trait_doc_comment):
 516         out_typescript_bindings = "\n\n\n// OUT_TYPESCRIPT_BINDINGS :: MAP_TRAIT :: START\n\n"
 517
 518         constructor_arguments = ""
 519         super_instantiator = ""
 520         pointer_to_adder = ""
 521         impl_constructor_arguments = ""
 522         for var in flattened_field_var_conversions:
 523             if isinstance(var, ConvInfo):
 524                 constructor_arguments += f", {first_to_lower(var.arg_name)}?: {var.java_hu_ty}"
 525                 impl_constructor_arguments += f", {var.arg_name}: {var.java_hu_ty}"
 526                 if var.from_hu_conv is not None:
 527                     super_instantiator += ", " + var.from_hu_conv[0]
 528                     if var.from_hu_conv[1] != "":
 529                         pointer_to_adder += var.from_hu_conv[1] + ";\n"
 530                 else:
 531                     super_instantiator += ", " + first_to_lower(var.arg_name)
 532             else:
 533                 constructor_arguments += f", {first_to_lower(var[1])}?: bindings.{var[0]}"
 534                 super_instantiator += ", " + first_to_lower(var[1])
 535                 pointer_to_adder += "this.ptrs_to.push(" + first_to_lower(var[1]) + ");\n"
 536                 impl_constructor_arguments += f", {first_to_lower(var[1])}_impl: {var[0].replace('LDK', '')}.{var[0].replace('LDK', '')}Interface"
 537
 538         # BUILD INTERFACE METHODS
 539         out_java_interface = ""
 540         out_interface_implementation_overrides = ""
 541         java_methods = []
 542         for fn_line in field_function_lines:
 543             java_method_descriptor = ""
 544             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 545                 out_java_interface += fn_line.fn_name + "("
 546                 out_interface_implementation_overrides += f"{fn_line.fn_name} ("
 547
 548                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 549                     if idx >= 1:
 550                         out_java_interface += ", "
 551                         out_interface_implementation_overrides += ", "
 552                     out_java_interface += f"{arg_conv_info.arg_name}: {arg_conv_info.java_hu_ty}"
 553                     out_interface_implementation_overrides += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
 554                     java_method_descriptor += arg_conv_info.java_fn_ty_arg
 555                 out_java_interface += f"): {fn_line.ret_ty_info.java_hu_ty};\n\t\t\t\t"
 556                 java_method_descriptor += ")" + fn_line.ret_ty_info.java_fn_ty_arg
 557                 java_methods.append((fn_line.fn_name, java_method_descriptor))
 558
 559                 out_interface_implementation_overrides += f"): {fn_line.ret_ty_info.java_ty} {{\n"
 560
 561                 interface_method_override_inset = "\t\t\t\t\t\t"
 562                 interface_implementation_inset = "\t\t\t\t\t\t\t"
 563                 for arg_info in fn_line.args_ty:
 564                     if arg_info.to_hu_conv is not None:
 565                         out_interface_implementation_overrides += interface_implementation_inset + arg_info.to_hu_conv.replace("\n", "\n\t\t\t\t") + "\n"
 566
 567                 if fn_line.ret_ty_info.java_ty != "void":
 568                     out_interface_implementation_overrides += interface_implementation_inset + fn_line.ret_ty_info.java_hu_ty + " ret = arg." + fn_line.fn_name + "("
 569                 else:
 570                     out_interface_implementation_overrides += f"{interface_implementation_inset}arg." + fn_line.fn_name + "("
 571
 572                 for idx, arg_info in enumerate(fn_line.args_ty):
 573                     if idx != 0:
 574                         out_interface_implementation_overrides += ", "
 575                     if arg_info.to_hu_conv_name is not None:
 576                         out_interface_implementation_overrides += arg_info.to_hu_conv_name
 577                     else:
 578                         out_interface_implementation_overrides += arg_info.arg_name
 579
 580                 out_interface_implementation_overrides += ");\n"
 581                 if fn_line.ret_ty_info.java_ty != "void":
 582                     if fn_line.ret_ty_info.from_hu_conv is not None:
 583                         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"
 584                         if fn_line.ret_ty_info.from_hu_conv[1] != "":
 585                             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"
 586                         #if fn_line.ret_ty_info.rust_obj in result_types:
 587                         # XXX: We need to handle this in conversion logic so that its cross-language!
 588                         # Avoid double-free by breaking the result - we should learn to clone these and then we can be safe instead
 589                         #    out_interface_implementation_overrides = out_interface_implementation_overrides + "\t\t\t\tret.ptr = 0;\n"
 590                         out_interface_implementation_overrides = out_interface_implementation_overrides + "\t\t\t\treturn result;\n"
 591                     else:
 592                         out_interface_implementation_overrides = out_interface_implementation_overrides + "\t\t\t\treturn ret;\n"
 593                 out_interface_implementation_overrides += f"{interface_method_override_inset}}},\n\n{interface_method_override_inset}"
 594
 595         trait_constructor_arguments = ""
 596         for var in field_var_conversions:
 597             if isinstance(var, ConvInfo):
 598                 trait_constructor_arguments += ", " + var.arg_name
 599             else:
 600                 trait_constructor_arguments += ", " + var[1] + ".new_impl(" + var[1] + "_impl"
 601                 for suparg in var[2]:
 602                     if isinstance(suparg, ConvInfo):
 603                         trait_constructor_arguments += ", " + suparg.arg_name
 604                     else:
 605                         trait_constructor_arguments += ", " + suparg[1]
 606                 trait_constructor_arguments += ").bindings_instance"
 607                 for suparg in var[2]:
 608                     if isinstance(suparg, ConvInfo):
 609                         trait_constructor_arguments += ", " + suparg.arg_name
 610                     else:
 611                         trait_constructor_arguments += ", " + suparg[1]
 612
 613         out_typescript_human = f"""
 614             {self.hu_struct_file_prefix}
 615
 616             export class {struct_name.replace("LDK","")} extends CommonBase {{
 617
 618                 bindings_instance?: bindings.{struct_name};
 619
 620                 constructor(ptr?: number, arg?: bindings.{struct_name}{constructor_arguments}) {{
 621                     if (Number.isFinite(ptr)) {{
 622                                         super(ptr);
 623                                         this.bindings_instance = null;
 624                                     }} else {{
 625                                         // TODO: private constructor instantiation
 626                                         super(bindings.{struct_name}_new(arg{super_instantiator}));
 627                                         this.ptrs_to.push(arg);
 628                                         {pointer_to_adder}
 629                                     }}
 630                 }}
 631
 632                 protected finalize() {{
 633                     if (this.ptr != 0) {{
 634                         bindings.{struct_name.replace("LDK","")}_free(this.ptr);
 635                     }}
 636                     super.finalize();
 637                 }}
 638
 639                 static new_impl(arg: {struct_name.replace("LDK", "")}Interface{impl_constructor_arguments}): {struct_name.replace("LDK", "")} {{
 640                     const impl_holder: {struct_name}Holder = new {struct_name}Holder();
 641                     let structImplementation = <bindings.{struct_name}>{{
 642                         // todo: in-line interface filling
 643                         {out_interface_implementation_overrides}
 644                     }};
 645                     impl_holder.held = new {struct_name.replace("LDK", "")} (null, structImplementation{trait_constructor_arguments});
 646                 }}
 647             }}
 648
 649             export interface {struct_name.replace("LDK", "")}Interface {{
 650                 {out_java_interface}
 651             }}
 652
 653             class {struct_name}Holder {{
 654                 held: {struct_name.replace("LDK", "")};
 655             }}
 656 """
 657
 658         out_typescript_bindings += "\t\texport interface " + struct_name + " {\n"
 659         java_meths = []
 660         for fn_line in field_function_lines:
 661             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 662                 out_typescript_bindings += f"\t\t\t{fn_line.fn_name} ("
 663
 664                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 665                     if idx >= 1:
 666                         out_typescript_bindings = out_typescript_bindings + ", "
 667                     out_typescript_bindings += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
 668
 669                 out_typescript_bindings += f"): {fn_line.ret_ty_info.java_ty};\n"
 670
 671         out_typescript_bindings = out_typescript_bindings + "\t\t}\n\n"
 672
 673         out_typescript_bindings += f"\t\texport function {struct_name}_new(impl: {struct_name}"
 674         for var in flattened_field_var_conversions:
 675             if isinstance(var, ConvInfo):
 676                 out_typescript_bindings += f", {var.arg_name}: {var.java_ty}"
 677             else:
 678                 out_typescript_bindings += f", {var[1]}: {var[0]}"
 679
 680         out_typescript_bindings += f"""): number {{
 681             throw new Error('unimplemented'); // TODO: bind to WASM
 682         }}
 683 """
 684
 685         out_typescript_bindings += '\n// OUT_TYPESCRIPT_BINDINGS :: MAP_TRAIT :: END\n\n\n'
 686
 687         # Now that we've written out our java code (and created java_meths), generate C
 688         out_c = "typedef struct " + struct_name + "_JCalls {\n"
 689         out_c = out_c + "\tatomic_size_t refcnt;\n"
 690         for var in flattened_field_var_conversions:
 691             if isinstance(var, ConvInfo):
 692                 # We're a regular ol' field
 693                 pass
 694             else:
 695                 # We're a supertrait
 696                 out_c = out_c + "\t" + var[0] + "_JCalls* " + var[1] + ";\n"
 697         for fn in field_function_lines:
 698             if fn.fn_name != "free" and fn.fn_name != "cloned":
 699                 out_c = out_c + "\tuint32_t " + fn.fn_name + "_meth;\n"
 700         out_c = out_c + "} " + struct_name + "_JCalls;\n"
 701
 702         for fn_line in field_function_lines:
 703             if fn_line.fn_name == "free":
 704                 out_c = out_c + "static void " + struct_name + "_JCalls_free(void* this_arg) {\n"
 705                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 706                 out_c = out_c + "\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n"
 707                 for fn in field_function_lines:
 708                     if fn.fn_name != "free" and fn.fn_name != "cloned":
 709                         out_c = out_c + "\t\tjs_free(j_calls->" + fn.fn_name + "_meth);\n"
 710                 out_c = out_c + "\t\tFREE(j_calls);\n"
 711                 out_c = out_c + "\t}\n}\n"
 712
 713         for idx, fn_line in enumerate(field_function_lines):
 714             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 715                 assert fn_line.ret_ty_info.ty_info.get_full_rust_ty()[1] == ""
 716                 out_c = out_c + fn_line.ret_ty_info.ty_info.get_full_rust_ty()[0] + " " + fn_line.fn_name + "_" + struct_name + "_jcall("
 717                 if fn_line.self_is_const:
 718                     out_c = out_c + "const void* this_arg"
 719                 else:
 720                     out_c = out_c + "void* this_arg"
 721
 722                 for idx, arg in enumerate(fn_line.args_ty):
 723                     out_c = out_c + ", " + arg.ty_info.get_full_rust_ty()[0] + " " + arg.arg_name + arg.ty_info.get_full_rust_ty()[1]
 724
 725                 out_c = out_c + ") {\n"
 726                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 727
 728                 for arg_info in fn_line.args_ty:
 729                     if arg_info.ret_conv is not None:
 730                         out_c = out_c + "\t" + arg_info.ret_conv[0].replace('\n', '\n\t')
 731                         out_c = out_c + arg_info.arg_name
 732                         out_c = out_c + arg_info.ret_conv[1].replace('\n', '\n\t') + "\n"
 733
 734                 if fn_line.ret_ty_info.c_ty.endswith("Array"):
 735                     out_c = out_c + "\t" + fn_line.ret_ty_info.c_ty + " ret = js_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->" + fn_line.fn_name + "_meth"
 736                 elif fn_line.ret_ty_info.java_ty == "void":
 737                     out_c = out_c + "\tjs_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->" + fn_line.fn_name + "_meth"
 738                 elif fn_line.ret_ty_info.java_ty == "String":
 739                     out_c = out_c + "\tuint32_t ret = js_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->" + fn_line.fn_name + "_meth"
 740                 elif not fn_line.ret_ty_info.passed_as_ptr:
 741                     out_c = out_c + "\treturn js_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->" + fn_line.fn_name + "_meth"
 742                 else:
 743                     out_c = out_c + "\tuint32_t ret = js_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->" + fn_line.fn_name + "_meth"
 744
 745                 for idx, arg_info in enumerate(fn_line.args_ty):
 746                     if arg_info.ret_conv is not None:
 747                         out_c = out_c + ", " + arg_info.ret_conv_name
 748                     else:
 749                         out_c = out_c + ", " + arg_info.arg_name
 750                 out_c = out_c + ");\n"
 751                 if fn_line.ret_ty_info.arg_conv is not None:
 752                     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"
 753
 754                 out_c = out_c + "}\n"
 755
 756         # Write out a clone function whether we need one or not, as we use them in moving to rust
 757         out_c = out_c + "static void " + struct_name + "_JCalls_cloned(" + struct_name + "* new_obj) {\n"
 758         out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) new_obj->this_arg;\n"
 759         out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n"
 760         for var in field_var_conversions:
 761             if not isinstance(var, ConvInfo):
 762                 out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->" + var[1] + "->refcnt, 1, memory_order_release);\n"
 763         out_c = out_c + "}\n"
 764
 765         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_init (/*TODO: JS Object Reference */void* o"
 766         for var in flattened_field_var_conversions:
 767             if isinstance(var, ConvInfo):
 768                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 769             else:
 770                 out_c = out_c + ", /*TODO: JS Object Reference */void* " + var[1]
 771         out_c = out_c + ") {\n"
 772
 773         out_c = out_c + "\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n"
 774         out_c = out_c + "\tatomic_init(&calls->refcnt, 1);\n"
 775         out_c = out_c + "\t//TODO: Assign calls->o from o\n"
 776
 777         for (fn_name, java_meth_descr) in java_meths:
 778             if fn_name != "free" and fn_name != "cloned":
 779                 out_c = out_c + "\tcalls->" + fn_name + "_meth = (*env)->GetMethodID(env, c, \"" + fn_name + "\", \"" + java_meth_descr + "\");\n"
 780                 out_c = out_c + "\tCHECK(calls->" + fn_name + "_meth != NULL);\n"
 781
 782         for var in flattened_field_var_conversions:
 783             if isinstance(var, ConvInfo) and var.arg_conv is not None:
 784                 out_c = out_c + "\n\t" + var.arg_conv.replace("\n", "\n\t") +"\n"
 785         out_c = out_c + "\n\t" + struct_name + " ret = {\n"
 786         out_c = out_c + "\t\t.this_arg = (void*) calls,\n"
 787         for fn_line in field_function_lines:
 788             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 789                 out_c = out_c + "\t\t." + fn_line.fn_name + " = " + fn_line.fn_name + "_" + struct_name + "_jcall,\n"
 790             elif fn_line.fn_name == "free":
 791                 out_c = out_c + "\t\t.free = " + struct_name + "_JCalls_free,\n"
 792             else:
 793                 out_c = out_c + "\t\t.cloned = " + struct_name + "_JCalls_cloned,\n"
 794         for var in field_var_conversions:
 795             if isinstance(var, ConvInfo):
 796                 if var.arg_conv_name is not None:
 797                     out_c = out_c + "\t\t." + var.arg_name + " = " + var.arg_conv_name + ",\n"
 798                     out_c = out_c + "\t\t.set_" + var.arg_name + " = NULL,\n"
 799                 else:
 800                     out_c = out_c + "\t\t." + var.var_name + " = " + var.var_name + ",\n"
 801                     out_c = out_c + "\t\t.set_" + var.var_name + " = NULL,\n"
 802             else:
 803                 out_c += "\t\t." + var[1] + " = " + var[0] + "_init(" + var[1]
 804                 for suparg in var[2]:
 805                     if isinstance(suparg, ConvInfo):
 806                         out_c += ", " + suparg.arg_name
 807                     else:
 808                         out_c += ", " + suparg[1]
 809                 out_c += "),\n"
 810         out_c = out_c + "\t};\n"
 811         for var in flattened_field_var_conversions:
 812             if not isinstance(var, ConvInfo):
 813                 out_c = out_c + "\tcalls->" + var[1] + " = ret." + var[1] + ".this_arg;\n"
 814         out_c = out_c + "\treturn ret;\n"
 815         out_c = out_c + "}\n"
 816
 817         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"
 818         for var in flattened_field_var_conversions:
 819             if isinstance(var, ConvInfo):
 820                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 821             else:
 822                 out_c = out_c + ", /*TODO: JS Object Reference */ void* " + var[1]
 823         out_c = out_c + ") {\n"
 824         out_c = out_c + "\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n"
 825         out_c = out_c + "\t*res_ptr = " + struct_name + "_init(o"
 826         for var in flattened_field_var_conversions:
 827             if isinstance(var, ConvInfo):
 828                 out_c = out_c + ", " + var.arg_name
 829             else:
 830                 out_c = out_c + ", " + var[1]
 831         out_c = out_c + ");\n"
 832         out_c = out_c + "\treturn (long)res_ptr;\n"
 833         out_c = out_c + "}\n"
 834
 835         return (out_typescript_bindings, out_typescript_human, out_c)
 836
 837     def trait_struct_inc_refcnt(self, ty_info):
 838         return ""
 839
 840     def map_complex_enum(self, struct_name, variant_list, camel_to_snake, enum_doc_comment):
 841         java_hu_type = struct_name.replace("LDK", "")
 842
 843         out_java_enum = ""
 844         out_java = ""
 845         out_c = ""
 846
 847         out_java_enum += (self.hu_struct_file_prefix)
 848         out_java_enum += ("export default class " + java_hu_type + " extends CommonBase {\n")
 849         out_java_enum += ("\tprotected constructor(_dummy: object, ptr: number) { super(ptr); }\n")
 850         out_java_enum += ("\tprotected finalize() {\n")
 851         out_java_enum += ("\t\tsuper.finalize();\n")
 852         out_java_enum += ("\t\tif (this.ptr != 0) { bindings." + java_hu_type + "_free(this.ptr); }\n")
 853         out_java_enum += ("\t}\n")
 854         out_java_enum += f"\tstatic constr_from_ptr(ptr: number): {java_hu_type} {{\n"
 855         out_java_enum += (f"\t\tconst raw_val: bindings.{struct_name} = bindings." + struct_name + "_ref_from_ptr(ptr);\n")
 856         java_hu_subclasses = ""
 857
 858         out_java +=  ("\tpublic static class " + struct_name + " {\n")
 859         out_java +=  ("\t\tprivate " + struct_name + "() {}\n")
 860         for var in variant_list:
 861             out_java +=  ("\t\texport class " + var.var_name + " extends " + struct_name + " {\n")
 862             java_hu_subclasses = java_hu_subclasses + "export class " + var.var_name + " extends " + java_hu_type + " {\n"
 863             out_java_enum += ("\t\tif (raw_val instanceof bindings." + struct_name + "." + var.var_name + ") {\n")
 864             out_java_enum += ("\t\t\treturn new " + var.var_name + "(this.ptr, raw_val);\n")
 865             init_meth_params = ""
 866             init_meth_body = ""
 867             hu_conv_body = ""
 868             for idx, (field_ty, field_docs) in enumerate(var.fields):
 869                 out_java += ("\t\t\tpublic " + field_ty.java_ty + " " + field_ty.arg_name + ";\n")
 870                 java_hu_subclasses = java_hu_subclasses + "\tpublic " + field_ty.arg_name + f": {field_ty.java_hu_ty};\n"
 871                 if field_ty.to_hu_conv is not None:
 872                     hu_conv_body = hu_conv_body + "\t\tconst " + field_ty.arg_name + f": {field_ty.java_ty} = obj." + field_ty.arg_name + ";\n"
 873                     hu_conv_body = hu_conv_body + "\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
 874                     hu_conv_body = hu_conv_body + "\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
 875                 else:
 876                     hu_conv_body = hu_conv_body + "\t\tthis." + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
 877                 if idx > 0:
 878                     init_meth_params = init_meth_params + ", "
 879                 init_meth_params = init_meth_params + field_ty.java_ty + " " + field_ty.arg_name
 880                 init_meth_body = init_meth_body + "this." + field_ty.arg_name + " = " + field_ty.arg_name + "; "
 881             out_java +=  ("\t\t\t" + var.var_name + "(" + init_meth_params + ") { ")
 882             out_java +=  (init_meth_body)
 883             out_java +=  ("}\n")
 884             out_java += ("\t\t}\n")
 885             out_java_enum += ("\t\t}\n")
 886             java_hu_subclasses = java_hu_subclasses + "\tprivate constructor(ptr: number, obj: bindings." + struct_name + "." + var.var_name + ") {\n\t\tsuper(null, ptr);\n"
 887             java_hu_subclasses = java_hu_subclasses + hu_conv_body
 888             java_hu_subclasses = java_hu_subclasses + "\t}\n}\n"
 889         out_java += ("\t\tstatic native void init();\n")
 890         out_java += ("\t}\n")
 891         out_java_enum += ("\t\tthrow new Error('oops, this should be unreachable'); // Unreachable without extending the (internal) bindings interface\n\t}\n\n")
 892         out_java += ("\tstatic { " + struct_name + ".init(); }\n")
 893         out_java += ("\tpublic static native " + struct_name + " " + struct_name + "_ref_from_ptr(long ptr);\n");
 894
 895         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")
 896         out_c += ("\t" + struct_name + " *obj = (" + struct_name + "*)(ptr & ~1);\n")
 897         out_c += ("\tswitch(obj->tag) {\n")
 898         for var in variant_list:
 899             out_c += ("\t\tcase " + struct_name + "_" + var.var_name + ": {\n")
 900             c_params = []
 901             for idx, (field_map, _) in enumerate(var.fields):
 902                 if field_map.ret_conv is not None:
 903                     out_c += ("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
 904                     if var.tuple_variant:
 905                         out_c += "obj->" + camel_to_snake(var.var_name)
 906                     else:
 907                         out_c += "obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name
 908                     out_c += (field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
 909                     c_params.append(field_map.ret_conv_name)
 910                 else:
 911                     if var.tuple_variant:
 912                         c_params.append("obj->" + camel_to_snake(var.var_name))
 913                     else:
 914                         c_params.append("obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name)
 915             out_c += ("\t\t\treturn " + self.c_constr_native_complex_enum(struct_name, var.var_name, c_params) + ";\n")
 916             out_c += ("\t\t}\n")
 917         out_c += ("\t\tdefault: abort();\n")
 918         out_c += ("\t}\n}\n")
 919         out_java_enum += ("}\n")
 920         out_java_enum += (java_hu_subclasses)
 921         return (out_java, out_java_enum, out_c)
 922
 923     def map_opaque_struct(self, struct_name, struct_doc_comment):
 924         implementations = ""
 925         method_header = ""
 926         if struct_name.startswith("LDKLocked"):
 927             implementations += "implements AutoCloseable "
 928             method_header = """
 929                 public close() {
 930 """
 931         else:
 932             method_header = """
 933                 protected finalize() {
 934                     super.finalize();
 935 """
 936
 937         out_opaque_struct_human = f"""
 938             {self.hu_struct_file_prefix}
 939
 940             export default class {struct_name.replace("LDK","")} extends CommonBase {implementations}{{
 941                 constructor(_dummy: object, ptr: number) {{
 942                     super(ptr);
 943                 }}
 944
 945                 {method_header}
 946                     if (this.ptr != 0) {{
 947                         bindings.{struct_name.replace("LDK","")}_free(this.ptr);
 948                     }}
 949                 }}
 950 """
 951         return out_opaque_struct_human
 952
 953     def map_tuple(self, struct_name):
 954         return self.map_opaque_struct(struct_name, "A Tuple")
 955
 956     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):
 957         out_java = ""
 958         out_c = ""
 959         out_java_struct = None
 960
 961         out_java += ("\tpublic static native ")
 962         out_c += (self.c_fn_ty_pfx)
 963         out_c += (return_type_info.c_ty)
 964         out_java += (return_type_info.java_ty)
 965         if return_type_info.ret_conv is not None:
 966             ret_conv_pfx, ret_conv_sfx = return_type_info.ret_conv
 967         out_java += (" " + method_name + "(")
 968         out_c += (" "  + self.c_fn_name_define_pfx(method_name, True))
 969
 970         method_argument_string = ""
 971         native_call_argument_string = ""
 972         for idx, arg_conv_info in enumerate(argument_types):
 973             if idx != 0:
 974                 method_argument_string += (", ")
 975                 native_call_argument_string += ', '
 976                 out_c += (", ")
 977             if arg_conv_info.c_ty != "void":
 978                 out_c += (arg_conv_info.c_ty + " " + arg_conv_info.arg_name)
 979                 needs_encoding = arg_conv_info.c_ty in self.wasm_encoding_map
 980                 native_argument = arg_conv_info.arg_name
 981                 if needs_encoding:
 982                     converter = self.wasm_encoding_map[arg_conv_info.c_ty]
 983                     native_argument = f"{converter}({arg_conv_info.arg_name})"
 984                 method_argument_string += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
 985                 native_call_argument_string += native_argument
 986
 987         has_return_value = return_type_info.c_ty != 'void'
 988         needs_decoding = return_type_info.c_ty in self.wasm_decoding_map
 989         return_statement = 'return nativeResponseValue;'
 990         if not has_return_value:
 991             return_statement = '// debug statements here'
 992         elif needs_decoding:
 993             converter = self.wasm_decoding_map[return_type_info.c_ty]
 994             return_statement = f"return {converter}(nativeResponseValue);"
 995
 996         out_java = f"""\texport function {method_name}({method_argument_string}): {return_type_info.java_ty} {{
 997                 if(!isWasmInitialized) {{
 998                         throw new Error("initializeWasm() must be awaited first!");
 999                 }}
1000                 const nativeResponseValue = wasm.{method_name}({native_call_argument_string});
1001                 {return_statement}
1002         }}
1003 """
1004
1005         out_java_struct = ""
1006         if not args_known:
1007             out_java_struct += ("\t// Skipped " + method_name + "\n")
1008         else:
1009             if not takes_self:
1010                 out_java_struct += (
1011                         "\tpublic static " + return_type_info.java_hu_ty + " constructor_" + meth_n + "(")
1012             else:
1013                 out_java_struct += ("\tpublic " + return_type_info.java_hu_ty + " " + meth_n + "(")
1014             for idx, arg in enumerate(argument_types):
1015                 if idx != 0:
1016                     if not takes_self or idx > 1:
1017                         out_java_struct += (", ")
1018                 elif takes_self:
1019                     continue
1020                 if arg.java_ty != "void":
1021                     if arg.arg_name in default_constructor_args:
1022                         for explode_idx, explode_arg in enumerate(default_constructor_args[arg.arg_name]):
1023                             if explode_idx != 0:
1024                                 out_java_struct += (", ")
1025                             out_java_struct += (
1026                                     explode_arg.java_hu_ty + " " + arg.arg_name + "_" + explode_arg.arg_name)
1027                     else:
1028                         out_java_struct += (arg.java_hu_ty + " " + arg.arg_name)
1029
1030         out_c += (") {\n")
1031         if out_java_struct is not None:
1032             out_java_struct += (") {\n")
1033         for info in argument_types:
1034             if info.arg_conv is not None:
1035                 out_c += ("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
1036         if return_type_info.ret_conv is not None:
1037             out_c += ("\t" + ret_conv_pfx.replace('\n', '\n\t'))
1038         elif return_type_info.c_ty != "void":
1039             out_c += ("\t" + return_type_info.c_ty + " ret_val = ")
1040         else:
1041             out_c += ("\t")
1042         if c_call_string is None:
1043             out_c += (method_name + "(")
1044         else:
1045             out_c += (c_call_string)
1046         for idx, info in enumerate(argument_types):
1047             if info.arg_conv_name is not None:
1048                 if idx != 0:
1049                     out_c += (", ")
1050                 elif c_call_string is not None:
1051                     continue
1052                 out_c += (info.arg_conv_name)
1053         out_c += (")")
1054         if return_type_info.ret_conv is not None:
1055             out_c += (ret_conv_sfx.replace('\n', '\n\t'))
1056         else:
1057             out_c += (";")
1058         for info in argument_types:
1059             if info.arg_conv_cleanup is not None:
1060                 out_c += ("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
1061         if return_type_info.ret_conv is not None:
1062             out_c += ("\n\treturn " + return_type_info.ret_conv_name + ";")
1063         elif return_type_info.c_ty != "void":
1064             out_c += ("\n\treturn ret_val;")
1065         out_c += ("\n}\n\n")
1066
1067         if args_known:
1068             out_java_struct += ("\t\t")
1069             if return_type_info.java_ty != "void":
1070                 out_java_struct += (return_type_info.java_ty + " ret = ")
1071             out_java_struct += ("bindings." + method_name + "(")
1072             for idx, info in enumerate(argument_types):
1073                 if idx != 0:
1074                     out_java_struct += (", ")
1075                 if idx == 0 and takes_self:
1076                     out_java_struct += ("this.ptr")
1077                 elif info.arg_name in default_constructor_args:
1078                     out_java_struct += ("bindings." + info.java_hu_ty + "_new(")
1079                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
1080                         if explode_idx != 0:
1081                             out_java_struct += (", ")
1082                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1083                         if explode_arg.from_hu_conv is not None:
1084                             out_java_struct += (
1085                                 explode_arg.from_hu_conv[0].replace(explode_arg.arg_name, expl_arg_name))
1086                         else:
1087                             out_java_struct += (expl_arg_name)
1088                     out_java_struct += (")")
1089                 elif info.from_hu_conv is not None:
1090                     out_java_struct += (info.from_hu_conv[0])
1091                 else:
1092                     out_java_struct += (info.arg_name)
1093             out_java_struct += (");\n")
1094             if return_type_info.to_hu_conv is not None:
1095                 if not takes_self:
1096                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t").replace("this",
1097                                                                                                              return_type_info.to_hu_conv_name) + "\n")
1098                 else:
1099                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t") + "\n")
1100
1101             for idx, info in enumerate(argument_types):
1102                 if idx == 0 and takes_self:
1103                     pass
1104                 elif info.arg_name in default_constructor_args:
1105                     for explode_arg in default_constructor_args[info.arg_name]:
1106                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1107                         if explode_arg.from_hu_conv is not None and return_type_info.to_hu_conv_name:
1108                             out_java_struct += ("\t\t" + explode_arg.from_hu_conv[1].replace(explode_arg.arg_name,
1109                                                                                              expl_arg_name).replace(
1110                                 "this", return_type_info.to_hu_conv_name) + ";\n")
1111                 elif info.from_hu_conv is not None and info.from_hu_conv[1] != "":
1112                     if not takes_self and return_type_info.to_hu_conv_name is not None:
1113                         out_java_struct += (
1114                                 "\t\t" + info.from_hu_conv[1].replace("this", return_type_info.to_hu_conv_name).replace("\n", "\n\t\t") + ";\n")
1115                     else:
1116                         out_java_struct += ("\t\t" + info.from_hu_conv[1].replace("\n", "\n\t\t") + ";\n")
1117
1118             if return_type_info.to_hu_conv_name is not None:
1119                 out_java_struct += ("\t\treturn " + return_type_info.to_hu_conv_name + ";\n")
1120             elif return_type_info.java_ty != "void" and return_type_info.rust_obj != "LDK" + struct_meth:
1121                 out_java_struct += ("\t\treturn ret;\n")
1122             out_java_struct += ("\t}\n\n")
1123
1124         return (out_java, out_c, out_java_struct)