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