_ 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 "js-wasm.h"
 101 #include <stdatomic.h>
 102 #include <lightning.h>
 103
 104 // These should be provided...somehow...
 105 void *memset(void *s, int c, size_t n);
 106 void *memcpy(void *dest, const void *src, size_t n);
 107 int memcmp(const void *s1, const void *s2, size_t n);
 108
 109 void __attribute__((noreturn)) abort(void);
 110 static inline void assert(bool expression) {
 111         if (!expression) { abort(); }
 112 }
 113 """
 114
 115         if not DEBUG:
 116             self.c_file_pfx = self.c_file_pfx + """
 117 void *malloc(size_t size);
 118 void free(void *ptr);
 119
 120 #define MALLOC(a, _) malloc(a)
 121 #define FREE(p) if ((long)(p) > 1024) { free(p); }
 122 #define DO_ASSERT(a) (void)(a)
 123 #define CHECK(a)
 124 """
 125         else:
 126             self.c_file_pfx = self.c_file_pfx + """
 127 // Always run a, then assert it is true:
 128 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
 129 // Assert a is true or do nothing
 130 #define CHECK(a) DO_ASSERT(a)
 131
 132 // Running a leak check across all the allocations and frees of the JDK is a mess,
 133 // so instead we implement our own naive leak checker here, relying on the -wrap
 134 // linker option to wrap malloc/calloc/realloc/free, tracking everyhing allocated
 135 // and free'd in Rust or C across the generated bindings shared library.
 136
 137 #define BT_MAX 128
 138 typedef struct allocation {
 139         struct allocation* next;
 140         void* ptr;
 141         const char* struct_name;
 142 } allocation;
 143 static allocation* allocation_ll = NULL;
 144
 145 void* __real_malloc(size_t len);
 146 void* __real_calloc(size_t nmemb, size_t len);
 147 static void new_allocation(void* res, const char* struct_name) {
 148         allocation* new_alloc = __real_malloc(sizeof(allocation));
 149         new_alloc->ptr = res;
 150         new_alloc->struct_name = struct_name;
 151         new_alloc->next = allocation_ll;
 152         allocation_ll = new_alloc;
 153 }
 154 static void* MALLOC(size_t len, const char* struct_name) {
 155         void* res = __real_malloc(len);
 156         new_allocation(res, struct_name);
 157         return res;
 158 }
 159 void __real_free(void* ptr);
 160 static void alloc_freed(void* ptr) {
 161         allocation* p = NULL;
 162         allocation* it = allocation_ll;
 163         while (it->ptr != ptr) {
 164                 p = it; it = it->next;
 165                 if (it == NULL) {
 166                         //XXX: fprintf(stderr, "Tried to free unknown pointer %p\\n", ptr);
 167                         return; // addrsan should catch malloc-unknown and print more info than we have
 168                 }
 169         }
 170         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
 171         DO_ASSERT(it->ptr == ptr);
 172         __real_free(it);
 173 }
 174 static void FREE(void* ptr) {
 175         if ((long)ptr < 1024) return; // Rust loves to create pointers to the NULL page for dummys
 176         alloc_freed(ptr);
 177         __real_free(ptr);
 178 }
 179
 180 void* __wrap_malloc(size_t len) {
 181         void* res = __real_malloc(len);
 182         new_allocation(res, "malloc call");
 183         return res;
 184 }
 185 void* __wrap_calloc(size_t nmemb, size_t len) {
 186         void* res = __real_calloc(nmemb, len);
 187         new_allocation(res, "calloc call");
 188         return res;
 189 }
 190 void __wrap_free(void* ptr) {
 191         if (ptr == NULL) return;
 192         alloc_freed(ptr);
 193         __real_free(ptr);
 194 }
 195
 196 void* __real_realloc(void* ptr, size_t newlen);
 197 void* __wrap_realloc(void* ptr, size_t len) {
 198         if (ptr != NULL) alloc_freed(ptr);
 199         void* res = __real_realloc(ptr, len);
 200         new_allocation(res, "realloc call");
 201         return res;
 202 }
 203 void __wrap_reallocarray(void* ptr, size_t new_sz) {
 204         // Rust doesn't seem to use reallocarray currently
 205         DO_ASSERT(false);
 206 }
 207
 208 void __attribute__((destructor)) check_leaks() {
 209         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 210                 //XXX: fprintf(stderr, "%s %p remains\\n", a->struct_name, a->ptr);
 211         }
 212         DO_ASSERT(allocation_ll == NULL);
 213 }
 214 """
 215         self.c_file_pfx = self.c_file_pfx + """
 216 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
 217 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
 218 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
 219 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
 220
 221 _Static_assert(sizeof(void*) == 4, "Pointers mut be 32 bits");
 222
 223 typedef uint32_t int64_tArray;
 224 typedef uint32_t int8_tArray;
 225 typedef uint32_t uint32_tArray;
 226 typedef uint32_t ptrArray;
 227 typedef uint32_t jstring;
 228
 229 static inline uint32_t init_arr(size_t arr_len, size_t elem_size, const char *type_desc) {
 230         uint32_t *elems = (uint32_t*)MALLOC(arr_len * elem_size + 4, type_desc);
 231         elems[0] = arr_len;
 232         return (uint32_t)elems;
 233 }
 234
 235 static inline jstring str_ref_to_ts(const char* chars, size_t len) {
 236         char* err_buf = MALLOC(len + 4, "str conv buf");
 237         *((uint32_t*)err_buf) = len;
 238         memcpy(err_buf + 4, chars, len);
 239         return (uint32_t) err_buf;
 240 }
 241 static inline LDKStr str_ref_to_owned_c(jstring str) {
 242         uint32_t *str_len = (uint32_t*)str;
 243         char* newchars = MALLOC(*str_len + 1, "String chars");
 244         memcpy(newchars, (const char*)(str + 4), *str_len);
 245         newchars[*str_len] = 0;
 246         LDKStr res= {
 247                 .chars = newchars,
 248                 .len = *str_len,
 249                 .chars_is_owned = true
 250         };
 251         return res;
 252 }
 253
 254 typedef bool jboolean;
 255
 256 uint32_t __attribute__((visibility("default"))) TS_malloc(uint32_t size) {
 257         return (uint32_t)MALLOC(size, "JS-Called malloc");
 258 }
 259 void __attribute__((visibility("default"))) TS_free(uint32_t ptr) {
 260         FREE((void*)ptr);
 261 }
 262 """
 263
 264         self.hu_struct_file_prefix = f"""
 265 import CommonBase from './CommonBase';
 266 import * as bindings from '../bindings' // TODO: figure out location
 267
 268 """
 269         self.c_fn_ty_pfx = ""
 270         self.file_ext = ".ts"
 271         self.ptr_c_ty = "uint32_t"
 272         self.ptr_native_ty = "number"
 273         self.result_c_ty = "uint32_t"
 274         self.ptr_arr = "ptrArray"
 275         self.get_native_arr_len_call = ("*((uint32_t*)", ")")
 276
 277     def release_native_arr_ptr_call(self, ty_info, arr_var, arr_ptr_var):
 278         return None
 279     def create_native_arr_call(self, arr_len, ty_info):
 280         if ty_info.c_ty == "int8_tArray":
 281             return "init_arr(" + arr_len + ", sizeof(uint8_t), \"Native int8_tArray Bytes\")"
 282         elif ty_info.c_ty == "int64_tArray":
 283             return "init_arr(" + arr_len + ", sizeof(uint64_t), \"Native int64_tArray Bytes\")"
 284         elif ty_info.c_ty == "uint32_tArray":
 285             return "init_arr(" + arr_len + ", sizeof(uint32_t), \"Native uint32_tArray Bytes\")"
 286         elif ty_info.c_ty == "ptrArray":
 287             assert ty_info.subty is not None and ty_info.subty.c_ty.endswith("Array")
 288             return "init_arr(" + arr_len + ", sizeof(uint32_t), \"Native ptrArray Bytes\")"
 289         else:
 290             print("Need to create arr!", ty_info.c_ty)
 291             return ty_info.c_ty
 292     def set_native_arr_contents(self, arr_name, arr_len, ty_info):
 293         if ty_info.c_ty == "int8_tArray":
 294             return ("memcpy((uint8_t*)(" + arr_name + " + 4), ", ", " + arr_len + ")")
 295         else:
 296             assert False
 297     def get_native_arr_contents(self, arr_name, dest_name, arr_len, ty_info, copy):
 298         if ty_info.c_ty == "int8_tArray":
 299             if copy:
 300                 return "memcpy(" + dest_name + ", (uint8_t*)(" + arr_name + " + 4), " + arr_len + ")"
 301             else:
 302                 return "(int8_t*)(" + arr_name + " + 4)"
 303         else:
 304             return "(" + ty_info.subty.c_ty + "*)(" + arr_name + " + 4)"
 305     def get_native_arr_elem(self, arr_name, idxc, ty_info):
 306         assert False # Only called if above is None
 307     def get_native_arr_ptr_call(self, ty_info):
 308         if ty_info.subty is not None:
 309             return "(" + ty_info.subty.c_ty + "*)(", " + 4)"
 310         return "(" + ty_info.c_ty + "*)(", " + 4)"
 311     def get_native_arr_entry_call(self, ty_info, arr_name, idxc, entry_access):
 312         return None
 313     def cleanup_native_arr_ref_contents(self, arr_name, dest_name, arr_len, ty_info):
 314         if ty_info.c_ty == "int8_tArray":
 315             return None
 316         else:
 317             return None
 318
 319     def str_ref_to_native_call(self, var_name, str_len):
 320         return "str_ref_to_ts(" + var_name + ", " + str_len + ")"
 321     def str_ref_to_c_call(self, var_name):
 322         return "str_ref_to_owned_c(" + var_name + ")"
 323
 324     def c_fn_name_define_pfx(self, fn_name, have_args):
 325         return " __attribute__((visibility(\"default\"))) TS_" + fn_name + "("
 326
 327     def wasm_import_header(self, target):
 328         if target == Target.NODEJS:
 329             return """
 330 import * as fs from 'fs';
 331 const source = fs.readFileSync('./ldk.wasm');
 332
 333 const memory = new WebAssembly.Memory({initial: 256});
 334 const wasmModule = new WebAssembly.Module(source);
 335
 336 const imports: any = {};
 337 imports.env = {};
 338
 339 imports.env.memoryBase = 0;
 340 imports.env.memory = memory;
 341 imports.env.tableBase = 0;
 342 imports.env.table = new WebAssembly.Table({initial: 4, element: 'anyfunc'});
 343
 344 imports.env["abort"] = function () {
 345     console.error("ABORT");
 346 };
 347
 348 let wasm = null;
 349 let isWasmInitialized: boolean = false;
 350
 351
 352 // WASM CODEC
 353
 354 const nextMultipleOfFour = (value: number) => {
 355     return Math.ceil(value / 4) * 4;
 356 }
 357
 358 const encodeUint8Array = (inputArray) => {
 359         const cArrayPointer = wasm.TS_malloc(inputArray.length + 4);
 360         const arrayLengthView = new Uint32Array(memory.buffer, cArrayPointer, 1);
 361     arrayLengthView[0] = inputArray.length;
 362         const arrayMemoryView = new Uint8Array(memory.buffer, cArrayPointer + 4, inputArray.length);
 363         arrayMemoryView.set(inputArray);
 364         return cArrayPointer;
 365 }
 366
 367 const encodeUint32Array = (inputArray) => {
 368         const cArrayPointer = wasm.TS_malloc((inputArray.length + 1) * 4);
 369         const arrayMemoryView = new Uint32Array(memory.buffer, cArrayPointer, inputArray.length);
 370         arrayMemoryView.set(inputArray, 1);
 371     arrayMemoryView[0] = inputArray.length;
 372         return cArrayPointer;
 373 }
 374
 375 const getArrayLength = (arrayPointer) => {
 376         const arraySizeViewer = new Uint32Array(
 377                 memory.buffer, // value
 378                 arrayPointer, // offset
 379                 1 // one int
 380         );
 381         return arraySizeViewer[0];
 382 }
 383 const decodeUint8Array = (arrayPointer, free = true) => {
 384         const arraySize = getArrayLength(arrayPointer);
 385         const actualArrayViewer = new Uint8Array(
 386                 memory.buffer, // value
 387                 arrayPointer + 4, // offset (ignoring length bytes)
 388                 arraySize // uint8 count
 389         );
 390         // Clone the contents, TODO: In the future we should wrap the Viewer in a class that
 391         // will free the underlying memory when it becomes unreachable instead of copying here.
 392         const actualArray = actualArrayViewer.slice(0, arraySize);
 393         if (free) {
 394                 wasm.TS_free(arrayPointer);
 395         }
 396         return actualArray;
 397 }
 398 const decodeUint32Array = (arrayPointer, free = true) => {
 399         const arraySize = getArrayLength(arrayPointer);
 400         const actualArrayViewer = new Uint32Array(
 401                 memory.buffer, // value
 402                 arrayPointer + 4, // offset (ignoring length bytes)
 403                 arraySize // uint32 count
 404         );
 405         // Clone the contents, TODO: In the future we should wrap the Viewer in a class that
 406         // will free the underlying memory when it becomes unreachable instead of copying here.
 407         const actualArray = actualArrayViewer.slice(0, arraySize);
 408         if (free) {
 409                 wasm.TS_free(arrayPointer);
 410         }
 411         return actualArray;
 412 }
 413
 414 const encodeString = (string) => {
 415     // make malloc count divisible by 4
 416     const memoryNeed = nextMultipleOfFour(string.length + 1);
 417     const stringPointer = wasm.TS_malloc(memoryNeed);
 418     const stringMemoryView = new Uint8Array(
 419         memory.buffer, // value
 420         stringPointer, // offset
 421         string.length + 1 // length
 422     );
 423     for (let i = 0; i < string.length; i++) {
 424         stringMemoryView[i] = string.charCodeAt(i);
 425     }
 426     stringMemoryView[string.length] = 0;
 427     return stringPointer;
 428 }
 429
 430 const decodeString = (stringPointer, free = true) => {
 431     const memoryView = new Uint8Array(memory.buffer, stringPointer);
 432     let cursor = 0;
 433     let result = '';
 434
 435     while (memoryView[cursor] !== 0) {
 436         result += String.fromCharCode(memoryView[cursor]);
 437         cursor++;
 438     }
 439
 440     if (free) {
 441         wasm.wasm_free(stringPointer);
 442     }
 443
 444     return result;
 445 };
 446 """
 447         return ''
 448
 449     def init_str(self):
 450         return ""
 451
 452     def native_c_unitary_enum_map(self, struct_name, variants, enum_doc_comment):
 453         out_c = "static inline LDK" + struct_name + " LDK" + struct_name + "_from_js(int32_t ord) {\n"
 454         out_c = out_c + "\tswitch (ord) {\n"
 455         ord_v = 0
 456
 457         out_typescript_enum_fields = ""
 458
 459         for var in variants:
 460             out_c = out_c + "\t\tcase %d: return %s;\n" % (ord_v, var)
 461             ord_v = ord_v + 1
 462             out_typescript_enum_fields += f"{var},\n\t\t\t\t"
 463         out_c = out_c + "\t}\n"
 464         out_c = out_c + "\tabort();\n"
 465         out_c = out_c + "}\n"
 466
 467         out_c = out_c + "static inline int32_t LDK" + struct_name + "_to_js(LDK" + struct_name + " val) {\n"
 468         out_c = out_c + "\tswitch (val) {\n"
 469         ord_v = 0
 470         for var in variants:
 471             out_c = out_c + "\t\tcase " + var + ": return %d;\n" % ord_v
 472             ord_v = ord_v + 1
 473         out_c = out_c + "\t\tdefault: abort();\n"
 474         out_c = out_c + "\t}\n"
 475         out_c = out_c + "}\n"
 476
 477         out_typescript_enum = f"""
 478             export enum {struct_name} {{
 479                 {out_typescript_enum_fields}
 480             }}
 481 """
 482
 483         return (out_c, out_typescript_enum, "")
 484
 485     def c_unitary_enum_to_native_call(self, ty_info):
 486         return (ty_info.rust_obj + "_to_js(", ")")
 487     def native_unitary_enum_to_c_call(self, ty_info):
 488         return (ty_info.rust_obj + "_from_js(", ")")
 489
 490     def c_complex_enum_pass_ty(self, struct_name):
 491         return "uint32_t"
 492
 493     def c_constr_native_complex_enum(self, struct_name, variant, c_params):
 494         ret = "0 /* " + struct_name + " - " + variant + " */"
 495         for param in c_params:
 496             ret = ret + "; (void) " + param
 497         return ret
 498
 499     def native_c_map_trait(self, struct_name, field_var_conversions, flattened_field_var_conversions, field_function_lines, trait_doc_comment):
 500         out_typescript_bindings = "\n\n\n// OUT_TYPESCRIPT_BINDINGS :: MAP_TRAIT :: START\n\n"
 501
 502         constructor_arguments = ""
 503         super_instantiator = ""
 504         pointer_to_adder = ""
 505         impl_constructor_arguments = ""
 506         for var in flattened_field_var_conversions:
 507             if isinstance(var, ConvInfo):
 508                 constructor_arguments += f", {first_to_lower(var.arg_name)}?: {var.java_hu_ty}"
 509                 impl_constructor_arguments += f", {var.arg_name}: {var.java_hu_ty}"
 510                 if var.from_hu_conv is not None:
 511                     super_instantiator += ", " + var.from_hu_conv[0]
 512                     if var.from_hu_conv[1] != "":
 513                         pointer_to_adder += var.from_hu_conv[1] + ";\n"
 514                 else:
 515                     super_instantiator += ", " + first_to_lower(var.arg_name)
 516             else:
 517                 constructor_arguments += f", {first_to_lower(var[1])}?: bindings.{var[0]}"
 518                 super_instantiator += ", " + first_to_lower(var[1])
 519                 pointer_to_adder += "this.ptrs_to.push(" + first_to_lower(var[1]) + ");\n"
 520                 impl_constructor_arguments += f", {first_to_lower(var[1])}_impl: {var[0].replace('LDK', '')}.{var[0].replace('LDK', '')}Interface"
 521
 522         # BUILD INTERFACE METHODS
 523         out_java_interface = ""
 524         out_interface_implementation_overrides = ""
 525         java_methods = []
 526         for fn_line in field_function_lines:
 527             java_method_descriptor = ""
 528             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 529                 out_java_interface += fn_line.fn_name + "("
 530                 out_interface_implementation_overrides += f"{fn_line.fn_name} ("
 531
 532                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 533                     if idx >= 1:
 534                         out_java_interface += ", "
 535                         out_interface_implementation_overrides += ", "
 536                     out_java_interface += f"{arg_conv_info.arg_name}: {arg_conv_info.java_hu_ty}"
 537                     out_interface_implementation_overrides += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
 538                     java_method_descriptor += arg_conv_info.java_fn_ty_arg
 539                 out_java_interface += f"): {fn_line.ret_ty_info.java_hu_ty};\n\t\t\t\t"
 540                 java_method_descriptor += ")" + fn_line.ret_ty_info.java_fn_ty_arg
 541                 java_methods.append((fn_line.fn_name, java_method_descriptor))
 542
 543                 out_interface_implementation_overrides += f"): {fn_line.ret_ty_info.java_ty} {{\n"
 544
 545                 interface_method_override_inset = "\t\t\t\t\t\t"
 546                 interface_implementation_inset = "\t\t\t\t\t\t\t"
 547                 for arg_info in fn_line.args_ty:
 548                     if arg_info.to_hu_conv is not None:
 549                         out_interface_implementation_overrides += interface_implementation_inset + arg_info.to_hu_conv.replace("\n", "\n\t\t\t\t") + "\n"
 550
 551                 if fn_line.ret_ty_info.java_ty != "void":
 552                     out_interface_implementation_overrides += interface_implementation_inset + fn_line.ret_ty_info.java_hu_ty + " ret = arg." + fn_line.fn_name + "("
 553                 else:
 554                     out_interface_implementation_overrides += f"{interface_implementation_inset}arg." + fn_line.fn_name + "("
 555
 556                 for idx, arg_info in enumerate(fn_line.args_ty):
 557                     if idx != 0:
 558                         out_interface_implementation_overrides += ", "
 559                     if arg_info.to_hu_conv_name is not None:
 560                         out_interface_implementation_overrides += arg_info.to_hu_conv_name
 561                     else:
 562                         out_interface_implementation_overrides += arg_info.arg_name
 563
 564                 out_interface_implementation_overrides += ");\n"
 565                 if fn_line.ret_ty_info.java_ty != "void":
 566                     if fn_line.ret_ty_info.from_hu_conv is not None:
 567                         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"
 568                         if fn_line.ret_ty_info.from_hu_conv[1] != "":
 569                             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"
 570                         #if fn_line.ret_ty_info.rust_obj in result_types:
 571                         # XXX: We need to handle this in conversion logic so that its cross-language!
 572                         # Avoid double-free by breaking the result - we should learn to clone these and then we can be safe instead
 573                         #    out_interface_implementation_overrides = out_interface_implementation_overrides + "\t\t\t\tret.ptr = 0;\n"
 574                         out_interface_implementation_overrides = out_interface_implementation_overrides + "\t\t\t\treturn result;\n"
 575                     else:
 576                         out_interface_implementation_overrides = out_interface_implementation_overrides + "\t\t\t\treturn ret;\n"
 577                 out_interface_implementation_overrides += f"{interface_method_override_inset}}},\n\n{interface_method_override_inset}"
 578
 579         trait_constructor_arguments = ""
 580         for var in field_var_conversions:
 581             if isinstance(var, ConvInfo):
 582                 trait_constructor_arguments += ", " + var.arg_name
 583             else:
 584                 trait_constructor_arguments += ", " + var[1] + ".new_impl(" + var[1] + "_impl"
 585                 for suparg in var[2]:
 586                     if isinstance(suparg, ConvInfo):
 587                         trait_constructor_arguments += ", " + suparg.arg_name
 588                     else:
 589                         trait_constructor_arguments += ", " + suparg[1]
 590                 trait_constructor_arguments += ").bindings_instance"
 591                 for suparg in var[2]:
 592                     if isinstance(suparg, ConvInfo):
 593                         trait_constructor_arguments += ", " + suparg.arg_name
 594                     else:
 595                         trait_constructor_arguments += ", " + suparg[1]
 596
 597         out_typescript_human = f"""
 598             {self.hu_struct_file_prefix}
 599
 600             export class {struct_name.replace("LDK","")} extends CommonBase {{
 601
 602                 bindings_instance?: bindings.{struct_name};
 603
 604                 constructor(ptr?: number, arg?: bindings.{struct_name}{constructor_arguments}) {{
 605                     if (Number.isFinite(ptr)) {{
 606                                         super(ptr);
 607                                         this.bindings_instance = null;
 608                                     }} else {{
 609                                         // TODO: private constructor instantiation
 610                                         super(bindings.{struct_name}_new(arg{super_instantiator}));
 611                                         this.ptrs_to.push(arg);
 612                                         {pointer_to_adder}
 613                                     }}
 614                 }}
 615
 616                 protected finalize() {{
 617                     if (this.ptr != 0) {{
 618                         bindings.{struct_name.replace("LDK","")}_free(this.ptr);
 619                     }}
 620                     super.finalize();
 621                 }}
 622
 623                 static new_impl(arg: {struct_name.replace("LDK", "")}Interface{impl_constructor_arguments}): {struct_name.replace("LDK", "")} {{
 624                     const impl_holder: {struct_name}Holder = new {struct_name}Holder();
 625                     let structImplementation = <bindings.{struct_name}>{{
 626                         // todo: in-line interface filling
 627                         {out_interface_implementation_overrides}
 628                     }};
 629                     impl_holder.held = new {struct_name.replace("LDK", "")} (null, structImplementation{trait_constructor_arguments});
 630                 }}
 631             }}
 632
 633             export interface {struct_name.replace("LDK", "")}Interface {{
 634                 {out_java_interface}
 635             }}
 636
 637             class {struct_name}Holder {{
 638                 held: {struct_name.replace("LDK", "")};
 639             }}
 640 """
 641
 642         out_typescript_bindings += "\t\texport interface " + struct_name + " {\n"
 643         java_meths = []
 644         for fn_line in field_function_lines:
 645             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 646                 out_typescript_bindings += f"\t\t\t{fn_line.fn_name} ("
 647
 648                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 649                     if idx >= 1:
 650                         out_typescript_bindings = out_typescript_bindings + ", "
 651                     out_typescript_bindings += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
 652
 653                 out_typescript_bindings += f"): {fn_line.ret_ty_info.java_ty};\n"
 654
 655         out_typescript_bindings = out_typescript_bindings + "\t\t}\n\n"
 656
 657         out_typescript_bindings += f"\t\texport function {struct_name}_new(impl: {struct_name}"
 658         for var in flattened_field_var_conversions:
 659             if isinstance(var, ConvInfo):
 660                 out_typescript_bindings += f", {var.arg_name}: {var.java_ty}"
 661             else:
 662                 out_typescript_bindings += f", {var[1]}: {var[0]}"
 663
 664         out_typescript_bindings += f"""): number {{
 665             throw new Error('unimplemented'); // TODO: bind to WASM
 666         }}
 667 """
 668
 669         out_typescript_bindings += '\n// OUT_TYPESCRIPT_BINDINGS :: MAP_TRAIT :: END\n\n\n'
 670
 671         # Now that we've written out our java code (and created java_meths), generate C
 672         out_c = "typedef struct " + struct_name + "_JCalls {\n"
 673         out_c = out_c + "\tatomic_size_t refcnt;\n"
 674         for var in flattened_field_var_conversions:
 675             if isinstance(var, ConvInfo):
 676                 # We're a regular ol' field
 677                 pass
 678             else:
 679                 # We're a supertrait
 680                 out_c = out_c + "\t" + var[0] + "_JCalls* " + var[1] + ";\n"
 681         for fn in field_function_lines:
 682             if fn.fn_name != "free" and fn.fn_name != "cloned":
 683                 out_c = out_c + "\tuint32_t " + fn.fn_name + "_meth;\n"
 684         out_c = out_c + "} " + struct_name + "_JCalls;\n"
 685
 686         for fn_line in field_function_lines:
 687             if fn_line.fn_name == "free":
 688                 out_c = out_c + "static void " + struct_name + "_JCalls_free(void* this_arg) {\n"
 689                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 690                 out_c = out_c + "\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n"
 691                 for fn in field_function_lines:
 692                     if fn.fn_name != "free" and fn.fn_name != "cloned":
 693                         out_c = out_c + "\t\tjs_free(j_calls->" + fn.fn_name + "_meth);\n"
 694                 out_c = out_c + "\t\tFREE(j_calls);\n"
 695                 out_c = out_c + "\t}\n}\n"
 696
 697         for idx, fn_line in enumerate(field_function_lines):
 698             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 699                 assert fn_line.ret_ty_info.ty_info.get_full_rust_ty()[1] == ""
 700                 out_c = out_c + fn_line.ret_ty_info.ty_info.get_full_rust_ty()[0] + " " + fn_line.fn_name + "_" + struct_name + "_jcall("
 701                 if fn_line.self_is_const:
 702                     out_c = out_c + "const void* this_arg"
 703                 else:
 704                     out_c = out_c + "void* this_arg"
 705
 706                 for idx, arg in enumerate(fn_line.args_ty):
 707                     out_c = out_c + ", " + arg.ty_info.get_full_rust_ty()[0] + " " + arg.arg_name + arg.ty_info.get_full_rust_ty()[1]
 708
 709                 out_c = out_c + ") {\n"
 710                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 711
 712                 for arg_info in fn_line.args_ty:
 713                     if arg_info.ret_conv is not None:
 714                         out_c = out_c + "\t" + arg_info.ret_conv[0].replace('\n', '\n\t')
 715                         out_c = out_c + arg_info.arg_name
 716                         out_c = out_c + arg_info.ret_conv[1].replace('\n', '\n\t') + "\n"
 717
 718                 if fn_line.ret_ty_info.c_ty.endswith("Array"):
 719                     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"
 720                 elif fn_line.ret_ty_info.java_ty == "void":
 721                     out_c = out_c + "\tjs_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->" + fn_line.fn_name + "_meth"
 722                 elif not fn_line.ret_ty_info.passed_as_ptr:
 723                     out_c = out_c + "\treturn js_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->" + fn_line.fn_name + "_meth"
 724                 else:
 725                     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"
 726
 727                 for idx, arg_info in enumerate(fn_line.args_ty):
 728                     if arg_info.ret_conv is not None:
 729                         out_c = out_c + ", " + arg_info.ret_conv_name
 730                     else:
 731                         out_c = out_c + ", " + arg_info.arg_name
 732                 out_c = out_c + ");\n"
 733                 if fn_line.ret_ty_info.arg_conv is not None:
 734                     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"
 735
 736                 out_c = out_c + "}\n"
 737
 738         # Write out a clone function whether we need one or not, as we use them in moving to rust
 739         out_c = out_c + "static void " + struct_name + "_JCalls_cloned(" + struct_name + "* new_obj) {\n"
 740         out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) new_obj->this_arg;\n"
 741         out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n"
 742         for var in field_var_conversions:
 743             if not isinstance(var, ConvInfo):
 744                 out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->" + var[1] + "->refcnt, 1, memory_order_release);\n"
 745         out_c = out_c + "\treturn (void*) this_arg;\n"
 746         out_c = out_c + "}\n"
 747
 748         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_init (/*TODO: JS Object Reference */void* o"
 749         for var in flattened_field_var_conversions:
 750             if isinstance(var, ConvInfo):
 751                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 752             else:
 753                 out_c = out_c + ", /*TODO: JS Object Reference */void* " + var[1]
 754         out_c = out_c + ") {\n"
 755
 756         out_c = out_c + "\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n"
 757         out_c = out_c + "\tatomic_init(&calls->refcnt, 1);\n"
 758         out_c = out_c + "\t//TODO: Assign calls->o from o\n"
 759
 760         for (fn_name, java_meth_descr) in java_meths:
 761             if fn_name != "free" and fn_name != "cloned":
 762                 out_c = out_c + "\tcalls->" + fn_name + "_meth = (*env)->GetMethodID(env, c, \"" + fn_name + "\", \"" + java_meth_descr + "\");\n"
 763                 out_c = out_c + "\tCHECK(calls->" + fn_name + "_meth != NULL);\n"
 764
 765         for var in flattened_field_var_conversions:
 766             if isinstance(var, ConvInfo) and var.arg_conv is not None:
 767                 out_c = out_c + "\n\t" + var.arg_conv.replace("\n", "\n\t") +"\n"
 768         out_c = out_c + "\n\t" + struct_name + " ret = {\n"
 769         out_c = out_c + "\t\t.this_arg = (void*) calls,\n"
 770         for fn_line in field_function_lines:
 771             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 772                 out_c = out_c + "\t\t." + fn_line.fn_name + " = " + fn_line.fn_name + "_" + struct_name + "_jcall,\n"
 773             elif fn_line.fn_name == "free":
 774                 out_c = out_c + "\t\t.free = " + struct_name + "_JCalls_free,\n"
 775             else:
 776                 out_c = out_c + "\t\t.cloned = " + struct_name + "_JCalls_cloned,\n"
 777         for var in field_var_conversions:
 778             if isinstance(var, ConvInfo):
 779                 if var.arg_conv_name is not None:
 780                     out_c = out_c + "\t\t." + var.arg_name + " = " + var.arg_conv_name + ",\n"
 781                     out_c = out_c + "\t\t.set_" + var.arg_name + " = NULL,\n"
 782                 else:
 783                     out_c = out_c + "\t\t." + var.var_name + " = " + var.var_name + ",\n"
 784                     out_c = out_c + "\t\t.set_" + var.var_name + " = NULL,\n"
 785             else:
 786                 out_c += "\t\t." + var[1] + " = " + var[0] + "_init(" + var[1]
 787                 for suparg in var[2]:
 788                     if isinstance(suparg, ConvInfo):
 789                         out_c += ", " + suparg.arg_name
 790                     else:
 791                         out_c += ", " + suparg[1]
 792                 out_c += "),\n"
 793         out_c = out_c + "\t};\n"
 794         for var in flattened_field_var_conversions:
 795             if not isinstance(var, ConvInfo):
 796                 out_c = out_c + "\tcalls->" + var[1] + " = ret." + var[1] + ".this_arg;\n"
 797         out_c = out_c + "\treturn ret;\n"
 798         out_c = out_c + "}\n"
 799
 800         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"
 801         for var in flattened_field_var_conversions:
 802             if isinstance(var, ConvInfo):
 803                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 804             else:
 805                 out_c = out_c + ", /*TODO: JS Object Reference */ void* " + var[1]
 806         out_c = out_c + ") {\n"
 807         out_c = out_c + "\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n"
 808         out_c = out_c + "\t*res_ptr = " + struct_name + "_init(o"
 809         for var in flattened_field_var_conversions:
 810             if isinstance(var, ConvInfo):
 811                 out_c = out_c + ", " + var.arg_name
 812             else:
 813                 out_c = out_c + ", " + var[1]
 814         out_c = out_c + ");\n"
 815         out_c = out_c + "\treturn (long)res_ptr;\n"
 816         out_c = out_c + "}\n"
 817
 818         return (out_typescript_bindings, out_typescript_human, out_c)
 819
 820     def trait_struct_inc_refcnt(self, ty_info):
 821         return ""
 822
 823     def map_complex_enum(self, struct_name, variant_list, camel_to_snake, enum_doc_comment):
 824         java_hu_type = struct_name.replace("LDK", "")
 825
 826         out_java_enum = ""
 827         out_java = ""
 828         out_c = ""
 829
 830         out_java_enum += (self.hu_struct_file_prefix)
 831         out_java_enum += ("export default class " + java_hu_type + " extends CommonBase {\n")
 832         out_java_enum += ("\tprotected constructor(_dummy: object, ptr: number) { super(ptr); }\n")
 833         out_java_enum += ("\tprotected finalize() {\n")
 834         out_java_enum += ("\t\tsuper.finalize();\n")
 835         out_java_enum += ("\t\tif (this.ptr != 0) { bindings." + java_hu_type + "_free(this.ptr); }\n")
 836         out_java_enum += ("\t}\n")
 837         out_java_enum += f"\tstatic constr_from_ptr(ptr: number): {java_hu_type} {{\n"
 838         out_java_enum += (f"\t\tconst raw_val: bindings.{struct_name} = bindings." + struct_name + "_ref_from_ptr(ptr);\n")
 839         java_hu_subclasses = ""
 840
 841         out_java +=  ("\tpublic static class " + struct_name + " {\n")
 842         out_java +=  ("\t\tprivate " + struct_name + "() {}\n")
 843         for var in variant_list:
 844             out_java +=  ("\t\texport class " + var.var_name + " extends " + struct_name + " {\n")
 845             java_hu_subclasses = java_hu_subclasses + "export class " + var.var_name + " extends " + java_hu_type + " {\n"
 846             out_java_enum += ("\t\tif (raw_val instanceof bindings." + struct_name + "." + var.var_name + ") {\n")
 847             out_java_enum += ("\t\t\treturn new " + var.var_name + "(this.ptr, raw_val);\n")
 848             init_meth_params = ""
 849             init_meth_body = ""
 850             hu_conv_body = ""
 851             for idx, field_ty in enumerate(var.fields):
 852                 out_java += ("\t\t\tpublic " + field_ty.java_ty + " " + field_ty.arg_name + ";\n")
 853                 java_hu_subclasses = java_hu_subclasses + "\tpublic " + field_ty.arg_name + f": {field_ty.java_hu_ty};\n"
 854                 if field_ty.to_hu_conv is not None:
 855                     hu_conv_body = hu_conv_body + "\t\tconst " + field_ty.arg_name + f": {field_ty.java_ty} = obj." + field_ty.arg_name + ";\n"
 856                     hu_conv_body = hu_conv_body + "\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
 857                     hu_conv_body = hu_conv_body + "\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
 858                 else:
 859                     hu_conv_body = hu_conv_body + "\t\tthis." + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
 860                 if idx > 0:
 861                     init_meth_params = init_meth_params + ", "
 862                 init_meth_params = init_meth_params + field_ty.java_ty + " " + field_ty.arg_name
 863                 init_meth_body = init_meth_body + "this." + field_ty.arg_name + " = " + field_ty.arg_name + "; "
 864             out_java +=  ("\t\t\t" + var.var_name + "(" + init_meth_params + ") { ")
 865             out_java +=  (init_meth_body)
 866             out_java +=  ("}\n")
 867             out_java += ("\t\t}\n")
 868             out_java_enum += ("\t\t}\n")
 869             java_hu_subclasses = java_hu_subclasses + "\tprivate constructor(ptr: number, obj: bindings." + struct_name + "." + var.var_name + ") {\n\t\tsuper(null, ptr);\n"
 870             java_hu_subclasses = java_hu_subclasses + hu_conv_body
 871             java_hu_subclasses = java_hu_subclasses + "\t}\n}\n"
 872         out_java += ("\t\tstatic native void init();\n")
 873         out_java += ("\t}\n")
 874         out_java_enum += ("\t\tthrow new Error('oops, this should be unreachable'); // Unreachable without extending the (internal) bindings interface\n\t}\n\n")
 875         out_java += ("\tstatic { " + struct_name + ".init(); }\n")
 876         out_java += ("\tpublic static native " + struct_name + " " + struct_name + "_ref_from_ptr(long ptr);\n");
 877
 878         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")
 879         out_c += ("\t" + struct_name + " *obj = (" + struct_name + "*)(ptr & ~1);\n")
 880         out_c += ("\tswitch(obj->tag) {\n")
 881         for var in variant_list:
 882             out_c += ("\t\tcase " + struct_name + "_" + var.var_name + ": {\n")
 883             c_params = []
 884             for idx, field_map in enumerate(var.fields):
 885                 if field_map.ret_conv is not None:
 886                     out_c += ("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
 887                     if var.tuple_variant:
 888                         out_c += "obj->" + camel_to_snake(var.var_name)
 889                     else:
 890                         out_c += "obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name
 891                     out_c += (field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
 892                     c_params.append(field_map.ret_conv_name)
 893                 else:
 894                     if var.tuple_variant:
 895                         c_params.append("obj->" + camel_to_snake(var.var_name))
 896                     else:
 897                         c_params.append("obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name)
 898             out_c += ("\t\t\treturn " + self.c_constr_native_complex_enum(struct_name, var.var_name, c_params) + ";\n")
 899             out_c += ("\t\t}\n")
 900         out_c += ("\t\tdefault: abort();\n")
 901         out_c += ("\t}\n}\n")
 902         out_java_enum += ("}\n")
 903         out_java_enum += (java_hu_subclasses)
 904         return (out_java, out_java_enum, out_c)
 905
 906     def map_opaque_struct(self, struct_name, struct_doc_comment):
 907         implementations = ""
 908         method_header = ""
 909         if struct_name.startswith("LDKLocked"):
 910             implementations += "implements AutoCloseable "
 911             method_header = """
 912                 public close() {
 913 """
 914         else:
 915             method_header = """
 916                 protected finalize() {
 917                     super.finalize();
 918 """
 919
 920         out_opaque_struct_human = f"""
 921             {self.hu_struct_file_prefix}
 922
 923             export default class {struct_name.replace("LDK","")} extends CommonBase {implementations}{{
 924                 constructor(_dummy: object, ptr: number) {{
 925                     super(ptr);
 926                 }}
 927
 928                 {method_header}
 929                     if (this.ptr != 0) {{
 930                         bindings.{struct_name.replace("LDK","")}_free(this.ptr);
 931                     }}
 932                 }}
 933 """
 934         return out_opaque_struct_human
 935
 936     def map_function(self, argument_types, c_call_string, method_name, return_type_info, struct_meth, default_constructor_args, takes_self, takes_self_as_ref, args_known, type_mapping_generator, doc_comment):
 937         out_java = ""
 938         out_c = ""
 939         out_java_struct = None
 940
 941         out_java += ("\tpublic static native ")
 942         out_c += (self.c_fn_ty_pfx)
 943         out_c += (return_type_info.c_ty)
 944         out_java += (return_type_info.java_ty)
 945         if return_type_info.ret_conv is not None:
 946             ret_conv_pfx, ret_conv_sfx = return_type_info.ret_conv
 947         out_java += (" " + method_name + "(")
 948         out_c += (" "  + self.c_fn_name_define_pfx(method_name, True))
 949
 950         method_argument_string = ""
 951         native_call_argument_string = ""
 952         for idx, arg_conv_info in enumerate(argument_types):
 953             if idx != 0:
 954                 method_argument_string += (", ")
 955                 native_call_argument_string += ', '
 956                 out_c += (", ")
 957             if arg_conv_info.c_ty != "void":
 958                 out_c += (arg_conv_info.c_ty + " " + arg_conv_info.arg_name)
 959                 needs_encoding = arg_conv_info.c_ty in self.wasm_encoding_map
 960                 native_argument = arg_conv_info.arg_name
 961                 if needs_encoding:
 962                     converter = self.wasm_encoding_map[arg_conv_info.c_ty]
 963                     native_argument = f"{converter}({arg_conv_info.arg_name})"
 964                 method_argument_string += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
 965                 native_call_argument_string += native_argument
 966
 967         has_return_value = return_type_info.c_ty != 'void'
 968         needs_decoding = return_type_info.c_ty in self.wasm_decoding_map
 969         return_statement = 'return nativeResponseValue;'
 970         if not has_return_value:
 971             return_statement = '// debug statements here'
 972         elif needs_decoding:
 973             converter = self.wasm_decoding_map[return_type_info.c_ty]
 974             return_statement = f"return {converter}(nativeResponseValue);"
 975
 976         out_java = f"""\texport function {method_name}({method_argument_string}): {return_type_info.java_ty} {{
 977                 if(!isWasmInitialized) {{
 978                         throw new Error("initializeWasm() must be awaited first!");
 979                 }}
 980                 const nativeResponseValue = wasm.{method_name}({native_call_argument_string});
 981                 {return_statement}
 982         }}
 983 """
 984
 985         out_java_struct = ""
 986         if not args_known:
 987             out_java_struct += ("\t// Skipped " + method_name + "\n")
 988         else:
 989             meth_n = method_name[len(struct_meth) + 1:]
 990             if not takes_self:
 991                 out_java_struct += (
 992                         "\tpublic static " + return_type_info.java_hu_ty + " constructor_" + meth_n + "(")
 993             else:
 994                 out_java_struct += ("\tpublic " + return_type_info.java_hu_ty + " " + meth_n + "(")
 995             for idx, arg in enumerate(argument_types):
 996                 if idx != 0:
 997                     if not takes_self or idx > 1:
 998                         out_java_struct += (", ")
 999                 elif takes_self:
1000                     continue
1001                 if arg.java_ty != "void":
1002                     if arg.arg_name in default_constructor_args:
1003                         for explode_idx, explode_arg in enumerate(default_constructor_args[arg.arg_name]):
1004                             if explode_idx != 0:
1005                                 out_java_struct += (", ")
1006                             out_java_struct += (
1007                                     explode_arg.java_hu_ty + " " + arg.arg_name + "_" + explode_arg.arg_name)
1008                     else:
1009                         out_java_struct += (arg.java_hu_ty + " " + arg.arg_name)
1010
1011         out_c += (") {\n")
1012         if out_java_struct is not None:
1013             out_java_struct += (") {\n")
1014         for info in argument_types:
1015             if info.arg_conv is not None:
1016                 out_c += ("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
1017         if return_type_info.ret_conv is not None:
1018             out_c += ("\t" + ret_conv_pfx.replace('\n', '\n\t'))
1019         elif return_type_info.c_ty != "void":
1020             out_c += ("\t" + return_type_info.c_ty + " ret_val = ")
1021         else:
1022             out_c += ("\t")
1023         if c_call_string is None:
1024             out_c += (method_name + "(")
1025         else:
1026             out_c += (c_call_string)
1027         for idx, info in enumerate(argument_types):
1028             if info.arg_conv_name is not None:
1029                 if idx != 0:
1030                     out_c += (", ")
1031                 elif c_call_string is not None:
1032                     continue
1033                 out_c += (info.arg_conv_name)
1034         out_c += (")")
1035         if return_type_info.ret_conv is not None:
1036             out_c += (ret_conv_sfx.replace('\n', '\n\t'))
1037         else:
1038             out_c += (";")
1039         for info in argument_types:
1040             if info.arg_conv_cleanup is not None:
1041                 out_c += ("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
1042         if return_type_info.ret_conv is not None:
1043             out_c += ("\n\treturn " + return_type_info.ret_conv_name + ";")
1044         elif return_type_info.c_ty != "void":
1045             out_c += ("\n\treturn ret_val;")
1046         out_c += ("\n}\n\n")
1047
1048         if args_known:
1049             out_java_struct += ("\t\t")
1050             if return_type_info.java_ty != "void":
1051                 out_java_struct += (return_type_info.java_ty + " ret = ")
1052             out_java_struct += ("bindings." + method_name + "(")
1053             for idx, info in enumerate(argument_types):
1054                 if idx != 0:
1055                     out_java_struct += (", ")
1056                 if idx == 0 and takes_self:
1057                     out_java_struct += ("this.ptr")
1058                 elif info.arg_name in default_constructor_args:
1059                     out_java_struct += ("bindings." + info.java_hu_ty + "_new(")
1060                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
1061                         if explode_idx != 0:
1062                             out_java_struct += (", ")
1063                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1064                         if explode_arg.from_hu_conv is not None:
1065                             out_java_struct += (
1066                                 explode_arg.from_hu_conv[0].replace(explode_arg.arg_name, expl_arg_name))
1067                         else:
1068                             out_java_struct += (expl_arg_name)
1069                     out_java_struct += (")")
1070                 elif info.from_hu_conv is not None:
1071                     out_java_struct += (info.from_hu_conv[0])
1072                 else:
1073                     out_java_struct += (info.arg_name)
1074             out_java_struct += (");\n")
1075             if return_type_info.to_hu_conv is not None:
1076                 if not takes_self:
1077                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t").replace("this",
1078                                                                                                              return_type_info.to_hu_conv_name) + "\n")
1079                 else:
1080                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t") + "\n")
1081
1082             for idx, info in enumerate(argument_types):
1083                 if idx == 0 and takes_self:
1084                     pass
1085                 elif info.arg_name in default_constructor_args:
1086                     for explode_arg in default_constructor_args[info.arg_name]:
1087                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1088                         if explode_arg.from_hu_conv is not None and return_type_info.to_hu_conv_name:
1089                             out_java_struct += ("\t\t" + explode_arg.from_hu_conv[1].replace(explode_arg.arg_name,
1090                                                                                              expl_arg_name).replace(
1091                                 "this", return_type_info.to_hu_conv_name) + ";\n")
1092                 elif info.from_hu_conv is not None and info.from_hu_conv[1] != "":
1093                     if not takes_self and return_type_info.to_hu_conv_name is not None:
1094                         out_java_struct += (
1095                                 "\t\t" + info.from_hu_conv[1].replace("this", return_type_info.to_hu_conv_name).replace("\n", "\n\t\t") + ";\n")
1096                     else:
1097                         out_java_struct += ("\t\t" + info.from_hu_conv[1].replace("\n", "\n\t\t") + ";\n")
1098
1099             if return_type_info.to_hu_conv_name is not None:
1100                 out_java_struct += ("\t\treturn " + return_type_info.to_hu_conv_name + ";\n")
1101             elif return_type_info.java_ty != "void" and return_type_info.rust_obj != "LDK" + struct_meth:
1102                 out_java_struct += ("\t\treturn ret;\n")
1103             out_java_struct += ("\t}\n\n")
1104
1105         return (out_java, out_c, out_java_struct)