_ 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_footer = """
  75         export async function initializeWasm(allowDoubleInitialization: boolean = false): Promise<void> {
  76             if(isWasmInitialized && !allowDoubleInitialization) {
  77                 return;
  78             }
  79             const wasmInstance = await WebAssembly.instantiate(wasmModule, imports)
  80             wasm = wasmInstance.exports;
  81             isWasmInitialized = true;
  82         }
  83         """
  84
  85         self.util_fn_pfx = ""
  86         self.util_fn_sfx = ""
  87
  88         self.common_base = """
  89             export default class CommonBase {
  90                 ptr: number;
  91                 ptrs_to: object[] = []; // new LinkedList(); TODO: build linked list implementation
  92                 protected constructor(ptr: number) { this.ptr = ptr; }
  93                 public _test_only_get_ptr(): number { return this.ptr; }
  94                 protected finalize() {
  95                     // TODO: finalize myself
  96                 }
  97             }
  98 """
  99
 100         self.c_file_pfx = """#include <rust_types.h>
 101 #include "js-wasm.h"
 102 #include <stdatomic.h>
 103 #include <lightning.h>
 104
 105 // These should be provided...somehow...
 106 void *memset(void *s, int c, size_t n);
 107 void *memcpy(void *dest, const void *src, size_t n);
 108 int memcmp(const void *s1, const void *s2, size_t n);
 109
 110 void __attribute__((noreturn)) abort(void);
 111 static inline void assert(bool expression) {
 112         if (!expression) { abort(); }
 113 }
 114 """
 115
 116         if not DEBUG:
 117             self.c_file_pfx = self.c_file_pfx + """
 118 void *malloc(size_t size);
 119 void free(void *ptr);
 120
 121 #define MALLOC(a, _) malloc(a)
 122 #define FREE(p) if ((long)(p) > 1024) { free(p); }
 123 #define DO_ASSERT(a) (void)(a)
 124 #define CHECK(a)
 125 """
 126         else:
 127             self.c_file_pfx = self.c_file_pfx + """
 128 // Always run a, then assert it is true:
 129 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
 130 // Assert a is true or do nothing
 131 #define CHECK(a) DO_ASSERT(a)
 132
 133 // Running a leak check across all the allocations and frees of the JDK is a mess,
 134 // so instead we implement our own naive leak checker here, relying on the -wrap
 135 // linker option to wrap malloc/calloc/realloc/free, tracking everyhing allocated
 136 // and free'd in Rust or C across the generated bindings shared library.
 137
 138 #define BT_MAX 128
 139 typedef struct allocation {
 140         struct allocation* next;
 141         void* ptr;
 142         const char* struct_name;
 143 } allocation;
 144 static allocation* allocation_ll = NULL;
 145
 146 void* __real_malloc(size_t len);
 147 void* __real_calloc(size_t nmemb, size_t len);
 148 static void new_allocation(void* res, const char* struct_name) {
 149         allocation* new_alloc = __real_malloc(sizeof(allocation));
 150         new_alloc->ptr = res;
 151         new_alloc->struct_name = struct_name;
 152         new_alloc->next = allocation_ll;
 153         allocation_ll = new_alloc;
 154 }
 155 static void* MALLOC(size_t len, const char* struct_name) {
 156         void* res = __real_malloc(len);
 157         new_allocation(res, struct_name);
 158         return res;
 159 }
 160 void __real_free(void* ptr);
 161 static void alloc_freed(void* ptr) {
 162         allocation* p = NULL;
 163         allocation* it = allocation_ll;
 164         while (it->ptr != ptr) {
 165                 p = it; it = it->next;
 166                 if (it == NULL) {
 167                         //XXX: fprintf(stderr, "Tried to free unknown pointer %p\\n", ptr);
 168                         return; // addrsan should catch malloc-unknown and print more info than we have
 169                 }
 170         }
 171         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
 172         DO_ASSERT(it->ptr == ptr);
 173         __real_free(it);
 174 }
 175 static void FREE(void* ptr) {
 176         if ((long)ptr < 1024) return; // Rust loves to create pointers to the NULL page for dummys
 177         alloc_freed(ptr);
 178         __real_free(ptr);
 179 }
 180
 181 void* __wrap_malloc(size_t len) {
 182         void* res = __real_malloc(len);
 183         new_allocation(res, "malloc call");
 184         return res;
 185 }
 186 void* __wrap_calloc(size_t nmemb, size_t len) {
 187         void* res = __real_calloc(nmemb, len);
 188         new_allocation(res, "calloc call");
 189         return res;
 190 }
 191 void __wrap_free(void* ptr) {
 192         if (ptr == NULL) return;
 193         alloc_freed(ptr);
 194         __real_free(ptr);
 195 }
 196
 197 void* __real_realloc(void* ptr, size_t newlen);
 198 void* __wrap_realloc(void* ptr, size_t len) {
 199         if (ptr != NULL) alloc_freed(ptr);
 200         void* res = __real_realloc(ptr, len);
 201         new_allocation(res, "realloc call");
 202         return res;
 203 }
 204 void __wrap_reallocarray(void* ptr, size_t new_sz) {
 205         // Rust doesn't seem to use reallocarray currently
 206         DO_ASSERT(false);
 207 }
 208
 209 void __attribute__((destructor)) check_leaks() {
 210         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 211                 //XXX: fprintf(stderr, "%s %p remains\\n", a->struct_name, a->ptr);
 212         }
 213         DO_ASSERT(allocation_ll == NULL);
 214 }
 215 """
 216         self.c_file_pfx = self.c_file_pfx + """
 217 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
 218 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
 219 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
 220 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
 221
 222 _Static_assert(sizeof(void*) == 4, "Pointers mut be 32 bits");
 223
 224 typedef uint32_t int64_tArray;
 225 typedef uint32_t int8_tArray;
 226 typedef uint32_t uint32_tArray;
 227 typedef uint32_t ptrArray;
 228 typedef uint32_t jstring;
 229
 230 static inline uint32_t init_arr(size_t arr_len, size_t elem_size, const char *type_desc) {
 231         uint32_t *elems = (uint32_t*)MALLOC(arr_len * elem_size + 4, type_desc);
 232         elems[0] = arr_len;
 233         return (uint32_t)elems;
 234 }
 235
 236 jstring str_ref_to_ts(const char* chars, size_t len) {
 237         char* err_buf = MALLOC(len + 4, "str conv buf");
 238         *((uint32_t*)err_buf) = len;
 239         memcpy(err_buf + 4, chars, len);
 240         return (uint32_t) err_buf;
 241 }
 242
 243 typedef bool jboolean;
 244
 245 uint32_t __attribute__((visibility("default"))) TS_malloc(uint32_t size) {
 246         return (uint32_t)MALLOC(size, "JS-Called malloc");
 247 }
 248 void __attribute__((visibility("default"))) TS_free(uint32_t ptr) {
 249         FREE((void*)ptr);
 250 }
 251 """
 252
 253         self.hu_struct_file_prefix = f"""
 254 import CommonBase from './CommonBase';
 255 import * as bindings from '../bindings' // TODO: figure out location
 256
 257 """
 258         self.c_fn_ty_pfx = ""
 259         self.file_ext = ".ts"
 260         self.ptr_c_ty = "uint32_t"
 261         self.ptr_native_ty = "number"
 262         self.result_c_ty = "uint32_t"
 263         self.ptr_arr = "ptrArray"
 264         self.get_native_arr_len_call = ("*((uint32_t*)", ")")
 265
 266     def release_native_arr_ptr_call(self, ty_info, arr_var, arr_ptr_var):
 267         return None
 268     def create_native_arr_call(self, arr_len, ty_info):
 269         if ty_info.c_ty == "int8_tArray":
 270             return "init_arr(" + arr_len + ", sizeof(uint8_t), \"Native int8_tArray Bytes\")"
 271         elif ty_info.c_ty == "int64_tArray":
 272             return "init_arr(" + arr_len + ", sizeof(uint64_t), \"Native int64_tArray Bytes\")"
 273         elif ty_info.c_ty == "uint32_tArray":
 274             return "init_arr(" + arr_len + ", sizeof(uint32_t), \"Native uint32_tArray Bytes\")"
 275         elif ty_info.c_ty == "ptrArray":
 276             assert ty_info.subty is not None and ty_info.subty.c_ty.endswith("Array")
 277             return "init_arr(" + arr_len + ", sizeof(uint32_t), \"Native ptrArray Bytes\")"
 278         else:
 279             print("Need to create arr!", ty_info.c_ty)
 280             return ty_info.c_ty
 281     def set_native_arr_contents(self, arr_name, arr_len, ty_info):
 282         if ty_info.c_ty == "int8_tArray":
 283             return ("memcpy((uint8_t*)(" + arr_name + " + 4), ", ", " + arr_len + ")")
 284         else:
 285             assert False
 286     def get_native_arr_contents(self, arr_name, dest_name, arr_len, ty_info, copy):
 287         if ty_info.c_ty == "int8_tArray":
 288             if copy:
 289                 return "memcpy(" + dest_name + ", (uint8_t*)(" + arr_name + " + 4), " + arr_len + ")"
 290             else:
 291                 return "(int8_t*)(" + arr_name + " + 4)"
 292         else:
 293             return "(" + ty_info.subty.c_ty + "*)(" + arr_name + " + 4)"
 294     def get_native_arr_elem(self, arr_name, idxc, ty_info):
 295         assert False # Only called if above is None
 296     def get_native_arr_ptr_call(self, ty_info):
 297         if ty_info.subty is not None:
 298             return "(" + ty_info.subty.c_ty + "*)(", " + 4)"
 299         return "(" + ty_info.c_ty + "*)(", " + 4)"
 300     def get_native_arr_entry_call(self, ty_info, arr_name, idxc, entry_access):
 301         return None
 302     def cleanup_native_arr_ref_contents(self, arr_name, dest_name, arr_len, ty_info):
 303         if ty_info.c_ty == "int8_tArray":
 304             return None
 305         else:
 306             return None
 307
 308     def str_ref_to_c_call(self, var_name, str_len):
 309         return "str_ref_to_ts(" + var_name + ", " + str_len + ")"
 310
 311     def c_fn_name_define_pfx(self, fn_name, have_args):
 312         return " __attribute__((visibility(\"default\"))) TS_" + fn_name + "("
 313
 314     def wasm_import_header(self, target):
 315         if target == Target.NODEJS:
 316             return """
 317 import * as fs from 'fs';
 318 const source = fs.readFileSync('./ldk.wasm');
 319
 320 const memory = new WebAssembly.Memory({initial: 256});
 321 const wasmModule = new WebAssembly.Module(source);
 322
 323 const imports: any = {};
 324 imports.env = {};
 325
 326 imports.env.memoryBase = 0;
 327 imports.env.memory = memory;
 328 imports.env.tableBase = 0;
 329 imports.env.table = new WebAssembly.Table({initial: 4, element: 'anyfunc'});
 330
 331 imports.env["abort"] = function () {
 332     console.error("ABORT");
 333 };
 334
 335 let wasm = null;
 336 let isWasmInitialized: boolean = false;
 337
 338
 339 // WASM CODEC
 340
 341 const nextMultipleOfFour = (value: number) => {
 342     return Math.ceil(value / 4) * 4;
 343 }
 344
 345 const encodeUint8Array = (inputArray) => {
 346         const cArrayPointer = wasm.TS_malloc(inputArray.length + 4);
 347         const arrayLengthView = new Uint32Array(memory.buffer, cArrayPointer, 1);
 348     arrayLengthView[0] = inputArray.length;
 349         const arrayMemoryView = new Uint8Array(memory.buffer, cArrayPointer + 4, inputArray.length);
 350         arrayMemoryView.set(inputArray);
 351         return cArrayPointer;
 352 }
 353
 354 const encodeUint32Array = (inputArray) => {
 355         const cArrayPointer = wasm.TS_malloc((inputArray.length + 1) * 4);
 356         const arrayMemoryView = new Uint32Array(memory.buffer, cArrayPointer, inputArray.length);
 357         arrayMemoryView.set(inputArray, 1);
 358     arrayMemoryView[0] = inputArray.length;
 359         return cArrayPointer;
 360 }
 361
 362 const getArrayLength = (arrayPointer) => {
 363         const arraySizeViewer = new Uint32Array(
 364                 memory.buffer, // value
 365                 arrayPointer, // offset
 366                 1 // one int
 367         );
 368         return arraySizeViewer[0];
 369 }
 370 const decodeUint8Array = (arrayPointer, free = true) => {
 371         const arraySize = getArrayLength(arrayPointer);
 372         const actualArrayViewer = new Uint8Array(
 373                 memory.buffer, // value
 374                 arrayPointer + 4, // offset (ignoring length bytes)
 375                 arraySize // uint8 count
 376         );
 377         // Clone the contents, TODO: In the future we should wrap the Viewer in a class that
 378         // will free the underlying memory when it becomes unreachable instead of copying here.
 379         const actualArray = actualArrayViewer.slice(0, arraySize);
 380         if (free) {
 381                 wasm.TS_free(arrayPointer);
 382         }
 383         return actualArray;
 384 }
 385 const decodeUint32Array = (arrayPointer, free = true) => {
 386         const arraySize = getArrayLength(arrayPointer);
 387         const actualArrayViewer = new Uint32Array(
 388                 memory.buffer, // value
 389                 arrayPointer + 4, // offset (ignoring length bytes)
 390                 arraySize // uint32 count
 391         );
 392         // Clone the contents, TODO: In the future we should wrap the Viewer in a class that
 393         // will free the underlying memory when it becomes unreachable instead of copying here.
 394         const actualArray = actualArrayViewer.slice(0, arraySize);
 395         if (free) {
 396                 wasm.TS_free(arrayPointer);
 397         }
 398         return actualArray;
 399 }
 400
 401 const encodeString = (string) => {
 402     // make malloc count divisible by 4
 403     const memoryNeed = nextMultipleOfFour(string.length + 1);
 404     const stringPointer = wasm.TS_malloc(memoryNeed);
 405     const stringMemoryView = new Uint8Array(
 406         memory.buffer, // value
 407         stringPointer, // offset
 408         string.length + 1 // length
 409     );
 410     for (let i = 0; i < string.length; i++) {
 411         stringMemoryView[i] = string.charCodeAt(i);
 412     }
 413     stringMemoryView[string.length] = 0;
 414     return stringPointer;
 415 }
 416
 417 const decodeString = (stringPointer, free = true) => {
 418     const memoryView = new Uint8Array(memory.buffer, stringPointer);
 419     let cursor = 0;
 420     let result = '';
 421
 422     while (memoryView[cursor] !== 0) {
 423         result += String.fromCharCode(memoryView[cursor]);
 424         cursor++;
 425     }
 426
 427     if (free) {
 428         wasm.wasm_free(stringPointer);
 429     }
 430
 431     return result;
 432 };
 433 """
 434         return ''
 435
 436     def init_str(self):
 437         return ""
 438
 439     def native_c_unitary_enum_map(self, struct_name, variants, enum_doc_comment):
 440         out_c = "static inline " + struct_name + " " + struct_name + "_from_js(int32_t ord) {\n"
 441         out_c = out_c + "\tswitch (ord) {\n"
 442         ord_v = 0
 443
 444         out_typescript_enum_fields = ""
 445
 446         for var in variants:
 447             out_c = out_c + "\t\tcase %d: return %s;\n" % (ord_v, var)
 448             ord_v = ord_v + 1
 449             out_typescript_enum_fields += f"{var},\n\t\t\t\t"
 450         out_c = out_c + "\t}\n"
 451         out_c = out_c + "\tabort();\n"
 452         out_c = out_c + "}\n"
 453
 454         out_c = out_c + "static inline int32_t " + struct_name + "_to_js(" + struct_name + " val) {\n"
 455         out_c = out_c + "\tswitch (val) {\n"
 456         ord_v = 0
 457         for var in variants:
 458             out_c = out_c + "\t\tcase " + var + ": return %d;\n" % ord_v
 459             ord_v = ord_v + 1
 460         out_c = out_c + "\t\tdefault: abort();\n"
 461         out_c = out_c + "\t}\n"
 462         out_c = out_c + "}\n"
 463
 464         out_typescript_enum = f"""
 465             export enum {struct_name} {{
 466                 {out_typescript_enum_fields}
 467             }}
 468 """
 469
 470         return (out_c, out_typescript_enum, "")
 471
 472     def c_unitary_enum_to_native_call(self, ty_info):
 473         return (ty_info.rust_obj + "_to_js(", ")")
 474     def native_unitary_enum_to_c_call(self, ty_info):
 475         return (ty_info.rust_obj + "_from_js(", ")")
 476
 477     def c_complex_enum_pass_ty(self, struct_name):
 478         return "uint32_t"
 479
 480     def c_constr_native_complex_enum(self, struct_name, variant, c_params):
 481         ret = "0 /* " + struct_name + " - " + variant + " */"
 482         for param in c_params:
 483             ret = ret + "; (void) " + param
 484         return ret
 485
 486     def native_c_map_trait(self, struct_name, field_var_conversions, field_function_lines, trait_doc_comment):
 487         out_typescript_bindings = "\n\n\n// OUT_TYPESCRIPT_BINDINGS :: MAP_TRAIT :: START\n\n"
 488
 489         constructor_arguments = ""
 490         super_instantiator = ""
 491         pointer_to_adder = ""
 492         impl_constructor_arguments = ""
 493         for var in field_var_conversions:
 494             if isinstance(var, ConvInfo):
 495                 constructor_arguments += f", {first_to_lower(var.arg_name)}?: {var.java_hu_ty}"
 496                 impl_constructor_arguments += f", {var.arg_name}: {var.java_hu_ty}"
 497                 if var.from_hu_conv is not None:
 498                     super_instantiator += ", " + var.from_hu_conv[0]
 499                     if var.from_hu_conv[1] != "":
 500                         pointer_to_adder += var.from_hu_conv[1] + ";\n"
 501                 else:
 502                     super_instantiator += ", " + first_to_lower(var.arg_name)
 503             else:
 504                 constructor_arguments += f", {first_to_lower(var[1])}?: bindings.{var[0]}"
 505                 super_instantiator += ", " + first_to_lower(var[1])
 506                 pointer_to_adder += "this.ptrs_to.push(" + first_to_lower(var[1]) + ");\n"
 507                 impl_constructor_arguments += f", {first_to_lower(var[1])}_impl: {var[0].replace('LDK', '')}.{var[0].replace('LDK', '')}Interface"
 508
 509         # BUILD INTERFACE METHODS
 510         out_java_interface = ""
 511         out_interface_implementation_overrides = ""
 512         java_methods = []
 513         for fn_line in field_function_lines:
 514             java_method_descriptor = ""
 515             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 516                 out_java_interface += fn_line.fn_name + "("
 517                 out_interface_implementation_overrides += f"{fn_line.fn_name} ("
 518
 519                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 520                     if idx >= 1:
 521                         out_java_interface += ", "
 522                         out_interface_implementation_overrides += ", "
 523                     out_java_interface += f"{arg_conv_info.arg_name}: {arg_conv_info.java_hu_ty}"
 524                     out_interface_implementation_overrides += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
 525                     java_method_descriptor += arg_conv_info.java_fn_ty_arg
 526                 out_java_interface += f"): {fn_line.ret_ty_info.java_hu_ty};\n\t\t\t\t"
 527                 java_method_descriptor += ")" + fn_line.ret_ty_info.java_fn_ty_arg
 528                 java_methods.append((fn_line.fn_name, java_method_descriptor))
 529
 530                 out_interface_implementation_overrides += f"): {fn_line.ret_ty_info.java_ty} {{\n"
 531
 532                 interface_method_override_inset = "\t\t\t\t\t\t"
 533                 interface_implementation_inset = "\t\t\t\t\t\t\t"
 534                 for arg_info in fn_line.args_ty:
 535                     if arg_info.to_hu_conv is not None:
 536                         out_interface_implementation_overrides += interface_implementation_inset + arg_info.to_hu_conv.replace("\n", "\n\t\t\t\t") + "\n"
 537
 538                 if fn_line.ret_ty_info.java_ty != "void":
 539                     out_interface_implementation_overrides += interface_implementation_inset + fn_line.ret_ty_info.java_hu_ty + " ret = arg." + fn_line.fn_name + "("
 540                 else:
 541                     out_interface_implementation_overrides += f"{interface_implementation_inset}arg." + fn_line.fn_name + "("
 542
 543                 for idx, arg_info in enumerate(fn_line.args_ty):
 544                     if idx != 0:
 545                         out_interface_implementation_overrides += ", "
 546                     if arg_info.to_hu_conv_name is not None:
 547                         out_interface_implementation_overrides += arg_info.to_hu_conv_name
 548                     else:
 549                         out_interface_implementation_overrides += arg_info.arg_name
 550
 551                 out_interface_implementation_overrides += ");\n"
 552                 if fn_line.ret_ty_info.java_ty != "void":
 553                     if fn_line.ret_ty_info.from_hu_conv is not None:
 554                         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"
 555                         if fn_line.ret_ty_info.from_hu_conv[1] != "":
 556                             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"
 557                         #if fn_line.ret_ty_info.rust_obj in result_types:
 558                         # XXX: We need to handle this in conversion logic so that its cross-language!
 559                         # Avoid double-free by breaking the result - we should learn to clone these and then we can be safe instead
 560                         #    out_interface_implementation_overrides = out_interface_implementation_overrides + "\t\t\t\tret.ptr = 0;\n"
 561                         out_interface_implementation_overrides = out_interface_implementation_overrides + "\t\t\t\treturn result;\n"
 562                     else:
 563                         out_interface_implementation_overrides = out_interface_implementation_overrides + "\t\t\t\treturn ret;\n"
 564                 out_interface_implementation_overrides += f"{interface_method_override_inset}}},\n\n{interface_method_override_inset}"
 565
 566         trait_constructor_arguments = ""
 567         for var in field_var_conversions:
 568             if isinstance(var, ConvInfo):
 569                 trait_constructor_arguments += ", " + var.arg_name
 570             else:
 571                 trait_constructor_arguments += ", " + var[1] + ".new_impl(" + var[1] + "_impl).bindings_instance"
 572
 573         out_typescript_human = f"""
 574             {self.hu_struct_file_prefix}
 575
 576             export class {struct_name.replace("LDK","")} extends CommonBase {{
 577
 578                 bindings_instance?: bindings.{struct_name};
 579
 580                 constructor(ptr?: number, arg?: bindings.{struct_name}{constructor_arguments}) {{
 581                     if (Number.isFinite(ptr)) {{
 582                                         super(ptr);
 583                                         this.bindings_instance = null;
 584                                     }} else {{
 585                                         // TODO: private constructor instantiation
 586                                         super(bindings.{struct_name}_new(arg{super_instantiator}));
 587                                         this.ptrs_to.push(arg);
 588                                         {pointer_to_adder}
 589                                     }}
 590                 }}
 591
 592                 protected finalize() {{
 593                     if (this.ptr != 0) {{
 594                         bindings.{struct_name.replace("LDK","")}_free(this.ptr);
 595                     }}
 596                     super.finalize();
 597                 }}
 598
 599                 static new_impl(arg: {struct_name.replace("LDK", "")}Interface{impl_constructor_arguments}): {struct_name.replace("LDK", "")} {{
 600                     const impl_holder: {struct_name}Holder = new {struct_name}Holder();
 601                     let structImplementation = <bindings.{struct_name}>{{
 602                         // todo: in-line interface filling
 603                         {out_interface_implementation_overrides}
 604                     }};
 605                     impl_holder.held = new {struct_name.replace("LDK", "")} (null, structImplementation{trait_constructor_arguments});
 606                 }}
 607             }}
 608
 609             export interface {struct_name.replace("LDK", "")}Interface {{
 610                 {out_java_interface}
 611             }}
 612
 613             class {struct_name}Holder {{
 614                 held: {struct_name.replace("LDK", "")};
 615             }}
 616 """
 617
 618         out_typescript_bindings += "\t\texport interface " + struct_name + " {\n"
 619         java_meths = []
 620         for fn_line in field_function_lines:
 621             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 622                 out_typescript_bindings += f"\t\t\t{fn_line.fn_name} ("
 623
 624                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 625                     if idx >= 1:
 626                         out_typescript_bindings = out_typescript_bindings + ", "
 627                     out_typescript_bindings += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
 628
 629                 out_typescript_bindings += f"): {fn_line.ret_ty_info.java_ty};\n"
 630
 631         out_typescript_bindings = out_typescript_bindings + "\t\t}\n\n"
 632
 633         out_typescript_bindings += f"\t\texport function {struct_name}_new(impl: {struct_name}"
 634         for var in field_var_conversions:
 635             if isinstance(var, ConvInfo):
 636                 out_typescript_bindings += f", {var.arg_name}: {var.java_ty}"
 637             else:
 638                 out_typescript_bindings += f", {var[1]}: {var[0]}"
 639
 640         out_typescript_bindings += f"""): number {{
 641             throw new Error('unimplemented'); // TODO: bind to WASM
 642         }}
 643 """
 644
 645         out_typescript_bindings += '\n// OUT_TYPESCRIPT_BINDINGS :: MAP_TRAIT :: END\n\n\n'
 646
 647         # Now that we've written out our java code (and created java_meths), generate C
 648         out_c = "typedef struct " + struct_name + "_JCalls {\n"
 649         out_c = out_c + "\tatomic_size_t refcnt;\n"
 650         for var in field_var_conversions:
 651             if isinstance(var, ConvInfo):
 652                 # We're a regular ol' field
 653                 pass
 654             else:
 655                 # We're a supertrait
 656                 out_c = out_c + "\t" + var[0] + "_JCalls* " + var[1] + ";\n"
 657         for fn in field_function_lines:
 658             if fn.fn_name != "free" and fn.fn_name != "clone":
 659                 out_c = out_c + "\tuint32_t " + fn.fn_name + "_meth;\n"
 660         out_c = out_c + "} " + struct_name + "_JCalls;\n"
 661
 662         for fn_line in field_function_lines:
 663             if fn_line.fn_name == "free":
 664                 out_c = out_c + "static void " + struct_name + "_JCalls_free(void* this_arg) {\n"
 665                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 666                 out_c = out_c + "\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n"
 667                 for fn in field_function_lines:
 668                     if fn.fn_name != "free" and fn.fn_name != "clone":
 669                         out_c = out_c + "\t\tjs_free(j_calls->" + fn.fn_name + "_meth);\n"
 670                 out_c = out_c + "\t\tFREE(j_calls);\n"
 671                 out_c = out_c + "\t}\n}\n"
 672
 673         for idx, fn_line in enumerate(field_function_lines):
 674             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 675                 assert fn_line.ret_ty_info.ty_info.get_full_rust_ty()[1] == ""
 676                 out_c = out_c + fn_line.ret_ty_info.ty_info.get_full_rust_ty()[0] + " " + fn_line.fn_name + "_" + struct_name + "_jcall("
 677                 if fn_line.self_is_const:
 678                     out_c = out_c + "const void* this_arg"
 679                 else:
 680                     out_c = out_c + "void* this_arg"
 681
 682                 for idx, arg in enumerate(fn_line.args_ty):
 683                     out_c = out_c + ", " + arg.ty_info.get_full_rust_ty()[0] + " " + arg.arg_name + arg.ty_info.get_full_rust_ty()[1]
 684
 685                 out_c = out_c + ") {\n"
 686                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 687
 688                 for arg_info in fn_line.args_ty:
 689                     if arg_info.ret_conv is not None:
 690                         out_c = out_c + "\t" + arg_info.ret_conv[0].replace('\n', '\n\t')
 691                         out_c = out_c + arg_info.arg_name
 692                         out_c = out_c + arg_info.ret_conv[1].replace('\n', '\n\t') + "\n"
 693
 694                 if fn_line.ret_ty_info.c_ty.endswith("Array"):
 695                     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"
 696                 elif fn_line.ret_ty_info.java_ty == "void":
 697                     out_c = out_c + "\tjs_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->" + fn_line.fn_name + "_meth"
 698                 elif not fn_line.ret_ty_info.passed_as_ptr:
 699                     out_c = out_c + "\treturn js_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->" + fn_line.fn_name + "_meth"
 700                 else:
 701                     out_c = out_c + "\t" + fn_line.ret_ty_info.rust_obj + "* ret = (" + fn_line.ret_ty_info.rust_obj + "*)js_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->" + fn_line.fn_name + "_meth"
 702
 703                 for idx, arg_info in enumerate(fn_line.args_ty):
 704                     if arg_info.ret_conv is not None:
 705                         out_c = out_c + ", " + arg_info.ret_conv_name
 706                     else:
 707                         out_c = out_c + ", " + arg_info.arg_name
 708                 out_c = out_c + ");\n"
 709                 if fn_line.ret_ty_info.arg_conv is not None:
 710                     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"
 711
 712                 out_c = out_c + "}\n"
 713
 714         # Write out a clone function whether we need one or not, as we use them in moving to rust
 715         out_c = out_c + "static void* " + struct_name + "_JCalls_clone(const void* this_arg) {\n"
 716         out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 717         out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n"
 718         for var in field_var_conversions:
 719             if not isinstance(var, ConvInfo):
 720                 out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->" + var[1] + "->refcnt, 1, memory_order_release);\n"
 721         out_c = out_c + "\treturn (void*) this_arg;\n"
 722         out_c = out_c + "}\n"
 723
 724         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_init (/*TODO: JS Object Reference */void* o"
 725         for var in field_var_conversions:
 726             if isinstance(var, ConvInfo):
 727                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 728             else:
 729                 out_c = out_c + ", /*TODO: JS Object Reference */void* " + var[1]
 730         out_c = out_c + ") {\n"
 731
 732         out_c = out_c + "\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n"
 733         out_c = out_c + "\tatomic_init(&calls->refcnt, 1);\n"
 734         out_c = out_c + "\t//TODO: Assign calls->o from o\n"
 735
 736         for (fn_name, java_meth_descr) in java_meths:
 737             if fn_name != "free" and fn_name != "clone":
 738                 out_c = out_c + "\tcalls->" + fn_name + "_meth = (*env)->GetMethodID(env, c, \"" + fn_name + "\", \"" + java_meth_descr + "\");\n"
 739                 out_c = out_c + "\tCHECK(calls->" + fn_name + "_meth != NULL);\n"
 740
 741         for var in field_var_conversions:
 742             if isinstance(var, ConvInfo) and var.arg_conv is not None:
 743                 out_c = out_c + "\n\t" + var.arg_conv.replace("\n", "\n\t") +"\n"
 744         out_c = out_c + "\n\t" + struct_name + " ret = {\n"
 745         out_c = out_c + "\t\t.this_arg = (void*) calls,\n"
 746         for fn_line in field_function_lines:
 747             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 748                 out_c = out_c + "\t\t." + fn_line.fn_name + " = " + fn_line.fn_name + "_" + struct_name + "_jcall,\n"
 749             elif fn_line.fn_name == "free":
 750                 out_c = out_c + "\t\t.free = " + struct_name + "_JCalls_free,\n"
 751             else:
 752                 out_c = out_c + "\t\t.clone = " + struct_name + "_JCalls_clone,\n"
 753         for var in field_var_conversions:
 754             if isinstance(var, ConvInfo):
 755                 if var.arg_conv_name is not None:
 756                     out_c = out_c + "\t\t." + var.arg_name + " = " + var.arg_conv_name + ",\n"
 757                     out_c = out_c + "\t\t.set_" + var.arg_name + " = NULL,\n"
 758                 else:
 759                     out_c = out_c + "\t\t." + var.var_name + " = " + var.var_name + ",\n"
 760                     out_c = out_c + "\t\t.set_" + var.var_name + " = NULL,\n"
 761             else:
 762                 out_c = out_c + "\t\t." + var[1] + " = " + var[0] + "_init(" + var[1] + "),\n"
 763         out_c = out_c + "\t};\n"
 764         for var in field_var_conversions:
 765             if not isinstance(var, ConvInfo):
 766                 out_c = out_c + "\tcalls->" + var[1] + " = ret." + var[1] + ".this_arg;\n"
 767         out_c = out_c + "\treturn ret;\n"
 768         out_c = out_c + "}\n"
 769
 770         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"
 771         for var in field_var_conversions:
 772             if isinstance(var, ConvInfo):
 773                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 774             else:
 775                 out_c = out_c + ", /*TODO: JS Object Reference */ void* " + var[1]
 776         out_c = out_c + ") {\n"
 777         out_c = out_c + "\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n"
 778         out_c = out_c + "\t*res_ptr = " + struct_name + "_init(o"
 779         for var in field_var_conversions:
 780             if isinstance(var, ConvInfo):
 781                 out_c = out_c + ", " + var.arg_name
 782             else:
 783                 out_c = out_c + ", " + var[1]
 784         out_c = out_c + ");\n"
 785         out_c = out_c + "\treturn (long)res_ptr;\n"
 786         out_c = out_c + "}\n"
 787
 788         return (out_typescript_bindings, out_typescript_human, out_c)
 789
 790     def trait_struct_inc_refcnt(self, ty_info):
 791         return ""
 792
 793     def map_complex_enum(self, struct_name, variant_list, camel_to_snake, enum_doc_comment):
 794         java_hu_type = struct_name.replace("LDK", "")
 795
 796         out_java_enum = ""
 797         out_java = ""
 798         out_c = ""
 799
 800         out_java_enum += (self.hu_struct_file_prefix)
 801         out_java_enum += ("export default class " + java_hu_type + " extends CommonBase {\n")
 802         out_java_enum += ("\tprotected constructor(_dummy: object, ptr: number) { super(ptr); }\n")
 803         out_java_enum += ("\tprotected finalize() {\n")
 804         out_java_enum += ("\t\tsuper.finalize();\n")
 805         out_java_enum += ("\t\tif (this.ptr != 0) { bindings." + java_hu_type + "_free(this.ptr); }\n")
 806         out_java_enum += ("\t}\n")
 807         out_java_enum += f"\tstatic constr_from_ptr(ptr: number): {java_hu_type} {{\n"
 808         out_java_enum += (f"\t\tconst raw_val: bindings.{struct_name} = bindings." + struct_name + "_ref_from_ptr(ptr);\n")
 809         java_hu_subclasses = ""
 810
 811         out_java +=  ("\tpublic static class " + struct_name + " {\n")
 812         out_java +=  ("\t\tprivate " + struct_name + "() {}\n")
 813         for var in variant_list:
 814             out_java +=  ("\t\texport class " + var.var_name + " extends " + struct_name + " {\n")
 815             java_hu_subclasses = java_hu_subclasses + "export class " + var.var_name + " extends " + java_hu_type + " {\n"
 816             out_java_enum += ("\t\tif (raw_val instanceof bindings." + struct_name + "." + var.var_name + ") {\n")
 817             out_java_enum += ("\t\t\treturn new " + var.var_name + "(this.ptr, raw_val);\n")
 818             init_meth_params = ""
 819             init_meth_body = ""
 820             hu_conv_body = ""
 821             for idx, field_ty in enumerate(var.fields):
 822                 out_java += ("\t\t\tpublic " + field_ty.java_ty + " " + field_ty.arg_name + ";\n")
 823                 java_hu_subclasses = java_hu_subclasses + "\tpublic " + field_ty.arg_name + f": {field_ty.java_hu_ty};\n"
 824                 if field_ty.to_hu_conv is not None:
 825                     hu_conv_body = hu_conv_body + "\t\tconst " + field_ty.arg_name + f": {field_ty.java_ty} = obj." + field_ty.arg_name + ";\n"
 826                     hu_conv_body = hu_conv_body + "\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
 827                     hu_conv_body = hu_conv_body + "\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
 828                 else:
 829                     hu_conv_body = hu_conv_body + "\t\tthis." + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
 830                 if idx > 0:
 831                     init_meth_params = init_meth_params + ", "
 832                 init_meth_params = init_meth_params + field_ty.java_ty + " " + field_ty.arg_name
 833                 init_meth_body = init_meth_body + "this." + field_ty.arg_name + " = " + field_ty.arg_name + "; "
 834             out_java +=  ("\t\t\t" + var.var_name + "(" + init_meth_params + ") { ")
 835             out_java +=  (init_meth_body)
 836             out_java +=  ("}\n")
 837             out_java += ("\t\t}\n")
 838             out_java_enum += ("\t\t}\n")
 839             java_hu_subclasses = java_hu_subclasses + "\tprivate constructor(ptr: number, obj: bindings." + struct_name + "." + var.var_name + ") {\n\t\tsuper(null, ptr);\n"
 840             java_hu_subclasses = java_hu_subclasses + hu_conv_body
 841             java_hu_subclasses = java_hu_subclasses + "\t}\n}\n"
 842         out_java += ("\t\tstatic native void init();\n")
 843         out_java += ("\t}\n")
 844         out_java_enum += ("\t\tthrow new Error('oops, this should be unreachable'); // Unreachable without extending the (internal) bindings interface\n\t}\n\n")
 845         out_java += ("\tstatic { " + struct_name + ".init(); }\n")
 846         out_java += ("\tpublic static native " + struct_name + " " + struct_name + "_ref_from_ptr(long ptr);\n");
 847
 848         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")
 849         out_c += ("\t" + struct_name + " *obj = (" + struct_name + "*)(ptr & ~1);\n")
 850         out_c += ("\tswitch(obj->tag) {\n")
 851         for var in variant_list:
 852             out_c += ("\t\tcase " + struct_name + "_" + var.var_name + ": {\n")
 853             c_params = []
 854             for idx, field_map in enumerate(var.fields):
 855                 if field_map.ret_conv is not None:
 856                     out_c += ("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
 857                     if var.tuple_variant:
 858                         out_c += "obj->" + camel_to_snake(var.var_name)
 859                     else:
 860                         out_c += "obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name
 861                     out_c += (field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
 862                     c_params.append(field_map.ret_conv_name)
 863                 else:
 864                     if var.tuple_variant:
 865                         c_params.append("obj->" + camel_to_snake(var.var_name))
 866                     else:
 867                         c_params.append("obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name)
 868             out_c += ("\t\t\treturn " + self.c_constr_native_complex_enum(struct_name, var.var_name, c_params) + ";\n")
 869             out_c += ("\t\t}\n")
 870         out_c += ("\t\tdefault: abort();\n")
 871         out_c += ("\t}\n}\n")
 872         out_java_enum += ("}\n")
 873         out_java_enum += (java_hu_subclasses)
 874         return (out_java, out_java_enum, out_c)
 875
 876     def map_opaque_struct(self, struct_name, struct_doc_comment):
 877         implementations = ""
 878         method_header = ""
 879         if struct_name.startswith("LDKLocked"):
 880             implementations += "implements AutoCloseable "
 881             method_header = """
 882                 public close() {
 883 """
 884         else:
 885             method_header = """
 886                 protected finalize() {
 887                     super.finalize();
 888 """
 889
 890         out_opaque_struct_human = f"""
 891             {self.hu_struct_file_prefix}
 892
 893             export default class {struct_name.replace("LDK","")} extends CommonBase {implementations}{{
 894                 constructor(_dummy: object, ptr: number) {{
 895                     super(ptr);
 896                 }}
 897
 898                 {method_header}
 899                     if (this.ptr != 0) {{
 900                         bindings.{struct_name.replace("LDK","")}_free(this.ptr);
 901                     }}
 902                 }}
 903 """
 904         return out_opaque_struct_human
 905
 906     def map_function(self, argument_types, c_call_string, method_name, return_type_info, struct_meth, default_constructor_args, takes_self, args_known, type_mapping_generator, doc_comment):
 907         out_java = ""
 908         out_c = ""
 909         out_java_struct = None
 910
 911         out_java += ("\tpublic static native ")
 912         out_c += (self.c_fn_ty_pfx)
 913         out_c += (return_type_info.c_ty)
 914         out_java += (return_type_info.java_ty)
 915         if return_type_info.ret_conv is not None:
 916             ret_conv_pfx, ret_conv_sfx = return_type_info.ret_conv
 917         out_java += (" " + method_name + "(")
 918         out_c += (" "  + self.c_fn_name_define_pfx(method_name, True))
 919
 920         method_argument_string = ""
 921         native_call_argument_string = ""
 922         for idx, arg_conv_info in enumerate(argument_types):
 923             if idx != 0:
 924                 method_argument_string += (", ")
 925                 native_call_argument_string += ', '
 926                 out_c += (", ")
 927             if arg_conv_info.c_ty != "void":
 928                 out_c += (arg_conv_info.c_ty + " " + arg_conv_info.arg_name)
 929                 needs_encoding = arg_conv_info.c_ty in self.wasm_encoding_map
 930                 native_argument = arg_conv_info.arg_name
 931                 if needs_encoding:
 932                     converter = self.wasm_encoding_map[arg_conv_info.c_ty]
 933                     native_argument = f"{converter}({arg_conv_info.arg_name})"
 934                 method_argument_string += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
 935                 native_call_argument_string += native_argument
 936
 937         has_return_value = return_type_info.c_ty != 'void'
 938         needs_decoding = return_type_info.c_ty in self.wasm_decoding_map
 939         return_statement = 'return nativeResponseValue;'
 940         if not has_return_value:
 941             return_statement = '// debug statements here'
 942         elif needs_decoding:
 943             converter = self.wasm_decoding_map[return_type_info.c_ty]
 944             return_statement = f"return {converter}(nativeResponseValue);"
 945
 946         out_java = f"""\texport function {method_name}({method_argument_string}): {return_type_info.java_ty} {{
 947                 if(!isWasmInitialized) {{
 948                         throw new Error("initializeWasm() must be awaited first!");
 949                 }}
 950                 const nativeResponseValue = wasm.{method_name}({native_call_argument_string});
 951                 {return_statement}
 952         }}
 953 """
 954
 955         out_java_struct = ""
 956         if not args_known:
 957             out_java_struct += ("\t// Skipped " + method_name + "\n")
 958         else:
 959             meth_n = method_name[len(struct_meth) + 1:]
 960             if not takes_self:
 961                 out_java_struct += (
 962                         "\tpublic static " + return_type_info.java_hu_ty + " constructor_" + meth_n + "(")
 963             else:
 964                 out_java_struct += ("\tpublic " + return_type_info.java_hu_ty + " " + meth_n + "(")
 965             for idx, arg in enumerate(argument_types):
 966                 if idx != 0:
 967                     if not takes_self or idx > 1:
 968                         out_java_struct += (", ")
 969                 elif takes_self:
 970                     continue
 971                 if arg.java_ty != "void":
 972                     if arg.arg_name in default_constructor_args:
 973                         for explode_idx, explode_arg in enumerate(default_constructor_args[arg.arg_name]):
 974                             if explode_idx != 0:
 975                                 out_java_struct += (", ")
 976                             out_java_struct += (
 977                                     explode_arg.java_hu_ty + " " + arg.arg_name + "_" + explode_arg.arg_name)
 978                     else:
 979                         out_java_struct += (arg.java_hu_ty + " " + arg.arg_name)
 980
 981         out_c += (") {\n")
 982         if out_java_struct is not None:
 983             out_java_struct += (") {\n")
 984         for info in argument_types:
 985             if info.arg_conv is not None:
 986                 out_c += ("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
 987         if return_type_info.ret_conv is not None:
 988             out_c += ("\t" + ret_conv_pfx.replace('\n', '\n\t'))
 989         elif return_type_info.c_ty != "void":
 990             out_c += ("\t" + return_type_info.c_ty + " ret_val = ")
 991         else:
 992             out_c += ("\t")
 993         if c_call_string is None:
 994             out_c += (method_name + "(")
 995         else:
 996             out_c += (c_call_string)
 997         for idx, info in enumerate(argument_types):
 998             if info.arg_conv_name is not None:
 999                 if idx != 0:
1000                     out_c += (", ")
1001                 elif c_call_string is not None:
1002                     continue
1003                 out_c += (info.arg_conv_name)
1004         out_c += (")")
1005         if return_type_info.ret_conv is not None:
1006             out_c += (ret_conv_sfx.replace('\n', '\n\t'))
1007         else:
1008             out_c += (";")
1009         for info in argument_types:
1010             if info.arg_conv_cleanup is not None:
1011                 out_c += ("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
1012         if return_type_info.ret_conv is not None:
1013             out_c += ("\n\treturn " + return_type_info.ret_conv_name + ";")
1014         elif return_type_info.c_ty != "void":
1015             out_c += ("\n\treturn ret_val;")
1016         out_c += ("\n}\n\n")
1017
1018         if args_known:
1019             out_java_struct += ("\t\t")
1020             if return_type_info.java_ty != "void":
1021                 out_java_struct += (return_type_info.java_ty + " ret = ")
1022             out_java_struct += ("bindings." + method_name + "(")
1023             for idx, info in enumerate(argument_types):
1024                 if idx != 0:
1025                     out_java_struct += (", ")
1026                 if idx == 0 and takes_self:
1027                     out_java_struct += ("this.ptr")
1028                 elif info.arg_name in default_constructor_args:
1029                     out_java_struct += ("bindings." + info.java_hu_ty + "_new(")
1030                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
1031                         if explode_idx != 0:
1032                             out_java_struct += (", ")
1033                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1034                         if explode_arg.from_hu_conv is not None:
1035                             out_java_struct += (
1036                                 explode_arg.from_hu_conv[0].replace(explode_arg.arg_name, expl_arg_name))
1037                         else:
1038                             out_java_struct += (expl_arg_name)
1039                     out_java_struct += (")")
1040                 elif info.from_hu_conv is not None:
1041                     out_java_struct += (info.from_hu_conv[0])
1042                 else:
1043                     out_java_struct += (info.arg_name)
1044             out_java_struct += (");\n")
1045             if return_type_info.to_hu_conv is not None:
1046                 if not takes_self:
1047                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t").replace("this",
1048                                                                                                              return_type_info.to_hu_conv_name) + "\n")
1049                 else:
1050                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t") + "\n")
1051
1052             for idx, info in enumerate(argument_types):
1053                 if idx == 0 and takes_self:
1054                     pass
1055                 elif info.arg_name in default_constructor_args:
1056                     for explode_arg in default_constructor_args[info.arg_name]:
1057                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1058                         if explode_arg.from_hu_conv is not None and return_type_info.to_hu_conv_name:
1059                             out_java_struct += ("\t\t" + explode_arg.from_hu_conv[1].replace(explode_arg.arg_name,
1060                                                                                              expl_arg_name).replace(
1061                                 "this", return_type_info.to_hu_conv_name) + ";\n")
1062                 elif info.from_hu_conv is not None and info.from_hu_conv[1] != "":
1063                     if not takes_self and return_type_info.to_hu_conv_name is not None:
1064                         out_java_struct += (
1065                                 "\t\t" + info.from_hu_conv[1].replace("this", return_type_info.to_hu_conv_name).replace("\n", "\n\t\t") + ";\n")
1066                     else:
1067                         out_java_struct += ("\t\t" + info.from_hu_conv[1].replace("\n", "\n\t\t") + ";\n")
1068
1069             if return_type_info.to_hu_conv_name is not None:
1070                 out_java_struct += ("\t\treturn " + return_type_info.to_hu_conv_name + ";\n")
1071             elif return_type_info.java_ty != "void" and return_type_info.rust_obj != "LDK" + struct_meth:
1072                 out_java_struct += ("\t\treturn ret;\n")
1073             out_java_struct += ("\t}\n\n")
1074
1075         return (out_java, out_c, out_java_struct)