_ 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 void assert(bool expression);
 109 """
 110
 111         if not DEBUG:
 112             self.c_file_pfx = self.c_file_pfx + """
 113 void *malloc(size_t size);
 114 void free(void *ptr);
 115
 116 #define MALLOC(a, _) malloc(a)
 117 #define FREE(p) if ((long)(p) > 1024) { free(p); }
 118 #define DO_ASSERT(a) (void)(a)
 119 #define CHECK(a)
 120 """
 121         else:
 122             self.c_file_pfx = self.c_file_pfx + """
 123 // Always run a, then assert it is true:
 124 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
 125 // Assert a is true or do nothing
 126 #define CHECK(a) DO_ASSERT(a)
 127
 128 // Running a leak check across all the allocations and frees of the JDK is a mess,
 129 // so instead we implement our own naive leak checker here, relying on the -wrap
 130 // linker option to wrap malloc/calloc/realloc/free, tracking everyhing allocated
 131 // and free'd in Rust or C across the generated bindings shared library.
 132
 133 #define BT_MAX 128
 134 typedef struct allocation {
 135         struct allocation* next;
 136         void* ptr;
 137         const char* struct_name;
 138 } allocation;
 139 static allocation* allocation_ll = NULL;
 140
 141 void* __real_malloc(size_t len);
 142 void* __real_calloc(size_t nmemb, size_t len);
 143 static void new_allocation(void* res, const char* struct_name) {
 144         allocation* new_alloc = __real_malloc(sizeof(allocation));
 145         new_alloc->ptr = res;
 146         new_alloc->struct_name = struct_name;
 147         new_alloc->next = allocation_ll;
 148         allocation_ll = new_alloc;
 149 }
 150 static void* MALLOC(size_t len, const char* struct_name) {
 151         void* res = __real_malloc(len);
 152         new_allocation(res, struct_name);
 153         return res;
 154 }
 155 void __real_free(void* ptr);
 156 static void alloc_freed(void* ptr) {
 157         allocation* p = NULL;
 158         allocation* it = allocation_ll;
 159         while (it->ptr != ptr) {
 160                 p = it; it = it->next;
 161                 if (it == NULL) {
 162                         //XXX: fprintf(stderr, "Tried to free unknown pointer %p\\n", ptr);
 163                         return; // addrsan should catch malloc-unknown and print more info than we have
 164                 }
 165         }
 166         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
 167         DO_ASSERT(it->ptr == ptr);
 168         __real_free(it);
 169 }
 170 static void FREE(void* ptr) {
 171         if ((long)ptr < 1024) return; // Rust loves to create pointers to the NULL page for dummys
 172         alloc_freed(ptr);
 173         __real_free(ptr);
 174 }
 175
 176 void* __wrap_malloc(size_t len) {
 177         void* res = __real_malloc(len);
 178         new_allocation(res, "malloc call");
 179         return res;
 180 }
 181 void* __wrap_calloc(size_t nmemb, size_t len) {
 182         void* res = __real_calloc(nmemb, len);
 183         new_allocation(res, "calloc call");
 184         return res;
 185 }
 186 void __wrap_free(void* ptr) {
 187         if (ptr == NULL) return;
 188         alloc_freed(ptr);
 189         __real_free(ptr);
 190 }
 191
 192 void* __real_realloc(void* ptr, size_t newlen);
 193 void* __wrap_realloc(void* ptr, size_t len) {
 194         if (ptr != NULL) alloc_freed(ptr);
 195         void* res = __real_realloc(ptr, len);
 196         new_allocation(res, "realloc call");
 197         return res;
 198 }
 199 void __wrap_reallocarray(void* ptr, size_t new_sz) {
 200         // Rust doesn't seem to use reallocarray currently
 201         DO_ASSERT(false);
 202 }
 203
 204 void __attribute__((destructor)) check_leaks() {
 205         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 206                 //XXX: fprintf(stderr, "%s %p remains\\n", a->struct_name, a->ptr);
 207         }
 208         DO_ASSERT(allocation_ll == NULL);
 209 }
 210 """
 211         self.c_file_pfx = self.c_file_pfx + """
 212 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
 213 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
 214 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
 215 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
 216
 217 _Static_assert(sizeof(void*) == 4, "Pointers mut be 32 bits");
 218
 219 typedef struct int64_tArray { uint32_t *len; /* len + 1 is data */ } int64_tArray;
 220 typedef struct uint32_tArray { uint32_t *len; /* len + 1 is data */ } uint32_tArray;
 221 typedef struct ptrArray { uint32_t *len; /* len + 1 is data */ } ptrArray;
 222 typedef struct int8_tArray { uint32_t *len; /* len + 1 is data */ } int8_tArray;
 223 typedef struct jstring {} jstring;
 224
 225 jstring conv_owned_string(const char* _src) { jstring a; return a; }
 226
 227 typedef bool jboolean;
 228
 229 """
 230
 231         self.hu_struct_file_prefix = f"""
 232 import CommonBase from './CommonBase';
 233 import * as bindings from '../bindings' // TODO: figure out location
 234
 235 """
 236         self.c_fn_ty_pfx = ""
 237         self.c_fn_name_pfx = ""
 238         self.c_fn_args_pfx = "void* ctx_TODO"
 239         self.file_ext = ".ts"
 240         self.ptr_c_ty = "uint32_t"
 241         self.ptr_native_ty = "uint32_t"
 242         self.result_c_ty = "uint32_t"
 243         self.owned_str_to_c_call = ("conv_owned_string(", ")")
 244         self.ptr_arr = "ptrArray"
 245         self.get_native_arr_len_call = ("*", ".len")
 246
 247     def release_native_arr_ptr_call(self, ty_info, arr_var, arr_ptr_var):
 248         return None
 249     def create_native_arr_call(self, arr_len, ty_info):
 250         if ty_info.c_ty == "int8_tArray":
 251             return "{ .len = MALLOC(" + arr_len + " + sizeof(uint32_t), \"Native " + ty_info.c_ty + " Bytes\") }"
 252         elif ty_info.c_ty == "int64_tArray":
 253             return "{ .len = MALLOC(" + arr_len + " * sizeof(int64_t) + sizeof(uint32_t), \"Native " + ty_info.c_ty + " Bytes\") }"
 254         elif ty_info.c_ty == "uint32_tArray":
 255             return "{ .len = MALLOC(" + arr_len + " * sizeof(int32_t) + sizeof(uint32_t), \"Native " + ty_info.c_ty + " Bytes\") }"
 256         elif ty_info.c_ty == "ptrArray":
 257             assert ty_info.subty is not None and ty_info.subty.c_ty.endswith("Array")
 258             return "{ .len = MALLOC(" + arr_len + " * sizeof(int32_t) + sizeof(uint32_t), \"Native Object Bytes\") }"
 259         else:
 260             print("Need to create arr!", ty_info.c_ty)
 261             return ty_info.c_ty
 262     def set_native_arr_contents(self, arr_name, arr_len, ty_info):
 263         if ty_info.c_ty == "int8_tArray":
 264             return ("memcpy(" + arr_name + ".len + 1, ", ", " + arr_len + ")")
 265         else:
 266             assert False
 267     def get_native_arr_contents(self, arr_name, dest_name, arr_len, ty_info, copy):
 268         if ty_info.c_ty == "int8_tArray":
 269             if copy:
 270                 return "memcpy(" + dest_name + ", " + arr_name + ".len + 1, " + arr_len + ")"
 271             else:
 272                 return "(int8_t*)(" + arr_name + ".len + 1)"
 273         else:
 274             return "(" + ty_info.subty.c_ty + "*)(" + arr_name + ".len + 1)"
 275     def get_native_arr_elem(self, arr_name, idxc, ty_info):
 276         assert False # Only called if above is None
 277     def get_native_arr_ptr_call(self, ty_info):
 278         if ty_info.subty is not None:
 279             return "(" + ty_info.subty.c_ty + "*)(", ".len + 1)"
 280         return "(" + ty_info.c_ty + "*)(", ".len + 1)"
 281     def get_native_arr_entry_call(self, ty_info, arr_name, idxc, entry_access):
 282         return None
 283     def cleanup_native_arr_ref_contents(self, arr_name, dest_name, arr_len, ty_info):
 284         if ty_info.c_ty == "int8_tArray":
 285             return None
 286         else:
 287             return None
 288
 289
 290     def wasm_import_header(self, target):
 291         if target == Target.NODEJS:
 292             return """
 293
 294 import * as fs from 'fs';
 295 const source = fs.readFileSync('./ldk.wasm');
 296
 297 const memory = new WebAssembly.Memory({initial: 256});
 298 const wasmModule = new WebAssembly.Module(source);
 299
 300 const imports: any = {};
 301 imports.env = {};
 302
 303 imports.env.memoryBase = 0;
 304 imports.env.memory = memory;
 305 imports.env.tableBase = 0;
 306 imports.env.table = new WebAssembly.Table({initial: 4, element: 'anyfunc'});
 307
 308 imports.env["abort"] = function () {
 309     console.error("ABORT");
 310 };
 311
 312 let wasm = null;
 313 let isWasmInitialized: boolean = false;
 314
 315
 316 // WASM CODEC
 317
 318 const nextMultipleOfFour = (value: number) => {
 319     return Math.ceil(value / 4) * 4;
 320 }
 321
 322 const encodeArray = (inputArray) => {
 323     // TODO: (matt) is this correct, or should it go back to length * 4?
 324     // const cArrayPointer = wasm.wasm_malloc(inputArray.length * 4);
 325     const cArrayPointer = wasm.wasm_malloc(nextMultipleOfFour(inputArray.length));
 326
 327     const arrayMemoryView = new Uint32Array(memory.buffer, cArrayPointer, inputArray.length);
 328     arrayMemoryView.set(inputArray);
 329     return cArrayPointer;
 330 }
 331
 332 const decodeArray = (arrayPointer, free = true) => {
 333     const arraySizeViewer = new Uint32Array(
 334         memory.buffer, // value
 335         arrayPointer, // offset
 336         1 // one int
 337     );
 338     const arraySize = arraySizeViewer[0];
 339     const actualArrayViewer = new Uint32Array(
 340         memory.buffer, // value
 341         arrayPointer, // offset
 342         arraySize + 1
 343     );
 344     const actualArray = actualArrayViewer.slice(1, arraySize + 1);
 345     if (free) {
 346         // wasm.free_array(arrayPointer);
 347         wasm.wasm_free(arrayPointer); // TODO: check if passing *void still captures remaining values
 348     }
 349     return actualArray;
 350 }
 351
 352 const encodeString = (string) => {
 353     // make malloc count divisible by 4
 354     const memoryNeed = nextMultipleOfFour(string.length + 1);
 355     const stringPointer = wasm.wasm_malloc(memoryNeed);
 356     const stringMemoryView = new Uint8Array(
 357         memory.buffer, // value
 358         stringPointer, // offset
 359         string.length + 1 // length
 360     );
 361     for (let i = 0; i < string.length; i++) {
 362         stringMemoryView[i] = string.charCodeAt(i);
 363     }
 364     stringMemoryView[string.length] = 0;
 365     return stringPointer;
 366 }
 367
 368 const decodeString = (stringPointer, free = true) => {
 369     const memoryView = new Uint8Array(memory.buffer, stringPointer);
 370     let cursor = 0;
 371     let result = '';
 372
 373     while (memoryView[cursor] !== 0) {
 374         result += String.fromCharCode(memoryView[cursor]);
 375         cursor++;
 376     }
 377
 378     if (free) {
 379         wasm.wasm_free(stringPointer);
 380     }
 381
 382     return result;
 383 };
 384
 385
 386             """
 387         return ''
 388
 389     def init_str(self):
 390         return ""
 391
 392     def native_c_unitary_enum_map(self, struct_name, variants):
 393         out_c = "static inline " + struct_name + " " + struct_name + "_from_js(int32_t ord) {\n"
 394         out_c = out_c + "\tswitch (ord) {\n"
 395         ord_v = 0
 396
 397         out_typescript_enum_fields = ""
 398
 399         for var in variants:
 400             out_c = out_c + "\t\tcase %d: return %s;\n" % (ord_v, var)
 401             ord_v = ord_v + 1
 402             out_typescript_enum_fields += f"{var},\n\t\t\t\t"
 403         out_c = out_c + "\t}\n"
 404         out_c = out_c + "\tabort();\n"
 405         out_c = out_c + "}\n"
 406
 407         out_c = out_c + "static inline int32_t " + struct_name + "_to_js(" + struct_name + " val) {\n"
 408         out_c = out_c + "\tswitch (val) {\n"
 409         ord_v = 0
 410         for var in variants:
 411             out_c = out_c + "\t\tcase " + var + ": return %d;\n" % ord_v
 412             ord_v = ord_v + 1
 413         out_c = out_c + "\t\tdefault: abort();\n"
 414         out_c = out_c + "\t}\n"
 415         out_c = out_c + "}\n"
 416
 417         out_typescript_enum = f"""
 418             export enum {struct_name} {{
 419                 {out_typescript_enum_fields}
 420             }}
 421 """
 422
 423         return (out_c, out_typescript_enum, "")
 424
 425     def c_unitary_enum_to_native_call(self, ty_info):
 426         return (ty_info.rust_obj + "_to_js(", ")")
 427     def native_unitary_enum_to_c_call(self, ty_info):
 428         return (ty_info.rust_obj + "_from_js(", ")")
 429
 430     def c_complex_enum_pass_ty(self, struct_name):
 431         return "uint32_t"
 432
 433     def c_constr_native_complex_enum(self, struct_name, variant, c_params):
 434         ret = "0 /* " + struct_name + " - " + variant + " */"
 435         for param in c_params:
 436             ret = ret + "; (void) " + param
 437         return ret
 438
 439     def native_c_map_trait(self, struct_name, field_var_conversions, field_function_lines):
 440         out_typescript_bindings = "\n\n\n// OUT_TYPESCRIPT_BINDINGS :: MAP_TRAIT :: START\n\n"
 441
 442         constructor_arguments = ""
 443         super_instantiator = ""
 444         pointer_to_adder = ""
 445         impl_constructor_arguments = ""
 446         for var in field_var_conversions:
 447             if isinstance(var, ConvInfo):
 448                 constructor_arguments += f", {first_to_lower(var.arg_name)}?: {var.java_hu_ty}"
 449                 impl_constructor_arguments += f", {var.arg_name}: {var.java_hu_ty}"
 450                 if var.from_hu_conv is not None:
 451                     super_instantiator += ", " + var.from_hu_conv[0]
 452                     if var.from_hu_conv[1] != "":
 453                         pointer_to_adder += var.from_hu_conv[1] + ";\n"
 454                 else:
 455                     super_instantiator += ", " + first_to_lower(var.arg_name)
 456             else:
 457                 constructor_arguments += f", {first_to_lower(var[1])}?: bindings.{var[0]}"
 458                 super_instantiator += ", " + first_to_lower(var[1])
 459                 pointer_to_adder += "this.ptrs_to.push(" + first_to_lower(var[1]) + ");\n"
 460                 impl_constructor_arguments += f", {first_to_lower(var[1])}_impl: {var[0].replace('LDK', '')}.{var[0].replace('LDK', '')}Interface"
 461
 462         # BUILD INTERFACE METHODS
 463         out_java_interface = ""
 464         out_interface_implementation_overrides = ""
 465         java_methods = []
 466         for fn_line in field_function_lines:
 467             java_method_descriptor = ""
 468             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 469                 out_java_interface += fn_line.fn_name + "("
 470                 out_interface_implementation_overrides += f"{fn_line.fn_name} ("
 471
 472                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 473                     if idx >= 1:
 474                         out_java_interface += ", "
 475                         out_interface_implementation_overrides += ", "
 476                     out_java_interface += f"{arg_conv_info.arg_name}: {arg_conv_info.java_hu_ty}"
 477                     out_interface_implementation_overrides += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
 478                     java_method_descriptor += arg_conv_info.java_fn_ty_arg
 479                 out_java_interface += f"): {fn_line.ret_ty_info.java_hu_ty};\n\t\t\t\t"
 480                 java_method_descriptor += ")" + fn_line.ret_ty_info.java_fn_ty_arg
 481                 java_methods.append((fn_line.fn_name, java_method_descriptor))
 482
 483                 out_interface_implementation_overrides += f"): {fn_line.ret_ty_info.java_ty} {{\n"
 484
 485                 interface_method_override_inset = "\t\t\t\t\t\t"
 486                 interface_implementation_inset = "\t\t\t\t\t\t\t"
 487                 for arg_info in fn_line.args_ty:
 488                     if arg_info.to_hu_conv is not None:
 489                         out_interface_implementation_overrides += interface_implementation_inset + arg_info.to_hu_conv.replace("\n", "\n\t\t\t\t") + "\n"
 490
 491                 if fn_line.ret_ty_info.java_ty != "void":
 492                     out_interface_implementation_overrides += interface_implementation_inset + fn_line.ret_ty_info.java_hu_ty + " ret = arg." + fn_line.fn_name + "("
 493                 else:
 494                     out_interface_implementation_overrides += f"{interface_implementation_inset}arg." + fn_line.fn_name + "("
 495
 496                 for idx, arg_info in enumerate(fn_line.args_ty):
 497                     if idx != 0:
 498                         out_interface_implementation_overrides += ", "
 499                     if arg_info.to_hu_conv_name is not None:
 500                         out_interface_implementation_overrides += arg_info.to_hu_conv_name
 501                     else:
 502                         out_interface_implementation_overrides += arg_info.arg_name
 503
 504                 out_interface_implementation_overrides += ");\n"
 505                 if fn_line.ret_ty_info.java_ty != "void":
 506                     if fn_line.ret_ty_info.from_hu_conv is not None:
 507                         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"
 508                         if fn_line.ret_ty_info.from_hu_conv[1] != "":
 509                             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"
 510                         #if fn_line.ret_ty_info.rust_obj in result_types:
 511                         # XXX: We need to handle this in conversion logic so that its cross-language!
 512                         # Avoid double-free by breaking the result - we should learn to clone these and then we can be safe instead
 513                         #    out_interface_implementation_overrides = out_interface_implementation_overrides + "\t\t\t\tret.ptr = 0;\n"
 514                         out_interface_implementation_overrides = out_interface_implementation_overrides + "\t\t\t\treturn result;\n"
 515                     else:
 516                         out_interface_implementation_overrides = out_interface_implementation_overrides + "\t\t\t\treturn ret;\n"
 517                 out_interface_implementation_overrides += f"{interface_method_override_inset}}},\n\n{interface_method_override_inset}"
 518
 519         trait_constructor_arguments = ""
 520         for var in field_var_conversions:
 521             if isinstance(var, ConvInfo):
 522                 trait_constructor_arguments += ", " + var.arg_name
 523             else:
 524                 trait_constructor_arguments += ", " + var[1] + ".new_impl(" + var[1] + "_impl).bindings_instance"
 525
 526         out_typescript_human = f"""
 527             {self.hu_struct_file_prefix}
 528
 529             export class {struct_name.replace("LDK","")} extends CommonBase {{
 530
 531                 bindings_instance?: bindings.{struct_name};
 532
 533                 constructor(ptr?: number, arg?: bindings.{struct_name}{constructor_arguments}) {{
 534                     if (Number.isFinite(ptr)) {{
 535                                         super(ptr);
 536                                         this.bindings_instance = null;
 537                                     }} else {{
 538                                         // TODO: private constructor instantiation
 539                                         super(bindings.{struct_name}_new(arg{super_instantiator}));
 540                                         this.ptrs_to.push(arg);
 541                                         {pointer_to_adder}
 542                                     }}
 543                 }}
 544
 545                 protected finalize() {{
 546                     if (this.ptr != 0) {{
 547                         bindings.{struct_name.replace("LDK","")}_free(this.ptr);
 548                     }}
 549                     super.finalize();
 550                 }}
 551
 552                 static new_impl(arg: {struct_name.replace("LDK", "")}Interface{impl_constructor_arguments}): {struct_name.replace("LDK", "")} {{
 553                     const impl_holder: {struct_name}Holder = new {struct_name}Holder();
 554                     let structImplementation = <bindings.{struct_name}>{{
 555                         // todo: in-line interface filling
 556                         {out_interface_implementation_overrides}
 557                     }};
 558                     impl_holder.held = new {struct_name.replace("LDK", "")} (null, structImplementation{trait_constructor_arguments});
 559                 }}
 560             }}
 561
 562             export interface {struct_name.replace("LDK", "")}Interface {{
 563                 {out_java_interface}
 564             }}
 565
 566             class {struct_name}Holder {{
 567                 held: {struct_name.replace("LDK", "")};
 568             }}
 569 """
 570
 571         out_typescript_bindings += "\t\texport interface " + struct_name + " {\n"
 572         java_meths = []
 573         for fn_line in field_function_lines:
 574             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 575                 out_typescript_bindings += f"\t\t\t{fn_line.fn_name} ("
 576
 577                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 578                     if idx >= 1:
 579                         out_typescript_bindings = out_typescript_bindings + ", "
 580                     out_typescript_bindings += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
 581
 582                 out_typescript_bindings += f"): {fn_line.ret_ty_info.java_ty};\n"
 583
 584         out_typescript_bindings = out_typescript_bindings + "\t\t}\n\n"
 585
 586         out_typescript_bindings += f"\t\texport function {struct_name}_new(impl: {struct_name}"
 587         for var in field_var_conversions:
 588             if isinstance(var, ConvInfo):
 589                 out_typescript_bindings += f", {var.arg_name}: {var.java_ty}"
 590             else:
 591                 out_typescript_bindings += f", {var[1]}: {var[0]}"
 592
 593         out_typescript_bindings += f"""): number {{
 594             throw new Error('unimplemented'); // TODO: bind to WASM
 595         }}
 596 """
 597
 598         out_typescript_bindings += '\n// OUT_TYPESCRIPT_BINDINGS :: MAP_TRAIT :: END\n\n\n'
 599
 600         # Now that we've written out our java code (and created java_meths), generate C
 601         out_c = "typedef struct " + struct_name + "_JCalls {\n"
 602         out_c = out_c + "\tatomic_size_t refcnt;\n"
 603         out_c = out_c + "\t// TODO: Object pointer o;\n"
 604         for var in field_var_conversions:
 605             if isinstance(var, ConvInfo):
 606                 # We're a regular ol' field
 607                 pass
 608             else:
 609                 # We're a supertrait
 610                 out_c = out_c + "\t" + var[0] + "_JCalls* " + var[1] + ";\n"
 611         for fn in field_function_lines:
 612             if fn.fn_name != "free" and fn.fn_name != "clone":
 613                 out_c = out_c + "\t// TODO: Some kind of method pointer " + fn.fn_name + "_meth;\n"
 614         out_c = out_c + "} " + struct_name + "_JCalls;\n"
 615
 616         for fn_line in field_function_lines:
 617             if fn_line.fn_name == "free":
 618                 out_c = out_c + "static void " + struct_name + "_JCalls_free(void* this_arg) {\n"
 619                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 620                 out_c = out_c + "\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n"
 621                 out_c = out_c + "\t\t// TODO: do any release required for j_calls->o (refcnt-- in java, but may be redundant)\n"
 622                 out_c = out_c + "\t\tFREE(j_calls);\n"
 623                 out_c = out_c + "\t}\n}\n"
 624
 625         for idx, fn_line in enumerate(field_function_lines):
 626             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 627                 assert fn_line.ret_ty_info.ty_info.get_full_rust_ty()[1] == ""
 628                 out_c = out_c + fn_line.ret_ty_info.ty_info.get_full_rust_ty()[0] + " " + fn_line.fn_name + "_jcall("
 629                 if fn_line.self_is_const:
 630                     out_c = out_c + "const void* this_arg"
 631                 else:
 632                     out_c = out_c + "void* this_arg"
 633
 634                 for idx, arg in enumerate(fn_line.args_ty):
 635                     out_c = out_c + ", " + arg.ty_info.get_full_rust_ty()[0] + " " + arg.arg_name + arg.ty_info.get_full_rust_ty()[1]
 636
 637                 out_c = out_c + ") {\n"
 638                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 639
 640                 for arg_info in fn_line.args_ty:
 641                     if arg_info.ret_conv is not None:
 642                         out_c = out_c + "\t" + arg_info.ret_conv[0].replace('\n', '\n\t')
 643                         out_c = out_c + arg_info.arg_name
 644                         out_c = out_c + arg_info.ret_conv[1].replace('\n', '\n\t') + "\n"
 645
 646                 out_c = out_c + "\t//TODO: jobject obj = get object we can call against on j_calls->o\n"
 647                 if fn_line.ret_ty_info.c_ty.endswith("Array"):
 648                     out_c = out_c + "\t" + fn_line.ret_ty_info.c_ty + " arg; // TODO: Call " + fn_line.fn_name + " on j_calls with instance obj, returning an object"
 649                 elif fn_line.ret_ty_info.java_ty == "void":
 650                     out_c = out_c + "\treturn; //TODO: Call " + fn_line.fn_name + " on j_calls with instance obj"
 651                 elif not fn_line.ret_ty_info.passed_as_ptr:
 652                     out_c = out_c + "\treturn 0; //TODO: Call " + fn_line.fn_name + " on j_calls with instance obj, returning " + fn_line.ret_ty_info.java_ty
 653                 else:
 654                     out_c = out_c + "\t" + fn_line.ret_ty_info.rust_obj + "* ret; // TODO: Call " + fn_line.fn_name + " on j_calls with instance obj, returning a pointer"
 655
 656                 for idx, arg_info in enumerate(fn_line.args_ty):
 657                     if arg_info.ret_conv is not None:
 658                         out_c = out_c + ", " + arg_info.ret_conv_name
 659                     else:
 660                         out_c = out_c + ", " + arg_info.arg_name
 661                 out_c = out_c + ");\n"
 662                 if fn_line.ret_ty_info.arg_conv is not None:
 663                     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"
 664
 665                 out_c = out_c + "}\n"
 666
 667         # Write out a clone function whether we need one or not, as we use them in moving to rust
 668         out_c = out_c + "static void* " + struct_name + "_JCalls_clone(const void* this_arg) {\n"
 669         out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 670         out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n"
 671         for var in field_var_conversions:
 672             if not isinstance(var, ConvInfo):
 673                 out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->" + var[1] + "->refcnt, 1, memory_order_release);\n"
 674         out_c = out_c + "\treturn (void*) this_arg;\n"
 675         out_c = out_c + "}\n"
 676
 677         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_init (" + self.c_fn_args_pfx + ", /*TODO: JS Object Reference */void* o"
 678         for var in field_var_conversions:
 679             if isinstance(var, ConvInfo):
 680                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 681             else:
 682                 out_c = out_c + ", /*TODO: JS Object Reference */void* " + var[1]
 683         out_c = out_c + ") {\n"
 684
 685         out_c = out_c + "\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n"
 686         out_c = out_c + "\tatomic_init(&calls->refcnt, 1);\n"
 687         out_c = out_c + "\t//TODO: Assign calls->o from o\n"
 688
 689         for (fn_name, java_meth_descr) in java_meths:
 690             if fn_name != "free" and fn_name != "clone":
 691                 out_c = out_c + "\tcalls->" + fn_name + "_meth = (*env)->GetMethodID(env, c, \"" + fn_name + "\", \"" + java_meth_descr + "\");\n"
 692                 out_c = out_c + "\tCHECK(calls->" + fn_name + "_meth != NULL);\n"
 693
 694         for var in field_var_conversions:
 695             if isinstance(var, ConvInfo) and var.arg_conv is not None:
 696                 out_c = out_c + "\n\t" + var.arg_conv.replace("\n", "\n\t") +"\n"
 697         out_c = out_c + "\n\t" + struct_name + " ret = {\n"
 698         out_c = out_c + "\t\t.this_arg = (void*) calls,\n"
 699         for fn_line in field_function_lines:
 700             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 701                 out_c = out_c + "\t\t." + fn_line.fn_name + " = " + fn_line.fn_name + "_jcall,\n"
 702             elif fn_line.fn_name == "free":
 703                 out_c = out_c + "\t\t.free = " + struct_name + "_JCalls_free,\n"
 704             else:
 705                 out_c = out_c + "\t\t.clone = " + struct_name + "_JCalls_clone,\n"
 706         for var in field_var_conversions:
 707             if isinstance(var, ConvInfo):
 708                 if var.arg_conv_name is not None:
 709                     out_c = out_c + "\t\t." + var.arg_name + " = " + var.arg_conv_name + ",\n"
 710                     out_c = out_c + "\t\t.set_" + var.arg_name + " = NULL,\n"
 711                 else:
 712                     out_c = out_c + "\t\t." + var.var_name + " = " + var.var_name + ",\n"
 713                     out_c = out_c + "\t\t.set_" + var.var_name + " = NULL,\n"
 714             else:
 715                 out_c = out_c + "\t\t." + var[1] + " = " + var[0] + "_init(NULL, " + var[1] + "),\n"
 716         out_c = out_c + "\t};\n"
 717         for var in field_var_conversions:
 718             if not isinstance(var, ConvInfo):
 719                 out_c = out_c + "\tcalls->" + var[1] + " = ret." + var[1] + ".this_arg;\n"
 720         out_c = out_c + "\treturn ret;\n"
 721         out_c = out_c + "}\n"
 722
 723         out_c = out_c + self.c_fn_ty_pfx + "long " + self.c_fn_name_pfx + struct_name.replace("_", "_1") + "_1new (" + self.c_fn_args_pfx + ", /*TODO: JS Object Reference */void* o"
 724         for var in field_var_conversions:
 725             if isinstance(var, ConvInfo):
 726                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 727             else:
 728                 out_c = out_c + ", /*TODO: JS Object Reference */ void* " + var[1]
 729         out_c = out_c + ") {\n"
 730         out_c = out_c + "\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n"
 731         out_c = out_c + "\t*res_ptr = " + struct_name + "_init(NULL, o"
 732         for var in field_var_conversions:
 733             if isinstance(var, ConvInfo):
 734                 out_c = out_c + ", " + var.arg_name
 735             else:
 736                 out_c = out_c + ", " + var[1]
 737         out_c = out_c + ");\n"
 738         out_c = out_c + "\treturn (long)res_ptr;\n"
 739         out_c = out_c + "}\n"
 740
 741         return (out_typescript_bindings, out_typescript_human, out_c)
 742
 743     def trait_struct_inc_refcnt(self, ty_info):
 744         return ""
 745
 746     def map_complex_enum(self, struct_name, variant_list, camel_to_snake):
 747         java_hu_type = struct_name.replace("LDK", "")
 748
 749         out_java_enum = ""
 750         out_java = ""
 751         out_c = ""
 752
 753         out_java_enum += (self.hu_struct_file_prefix)
 754         out_java_enum += ("export default class " + java_hu_type + " extends CommonBase {\n")
 755         out_java_enum += ("\tprotected constructor(_dummy: object, ptr: number) { super(ptr); }\n")
 756         out_java_enum += ("\tprotected finalize() {\n")
 757         out_java_enum += ("\t\tsuper.finalize();\n")
 758         out_java_enum += ("\t\tif (this.ptr != 0) { bindings." + java_hu_type + "_free(this.ptr); }\n")
 759         out_java_enum += ("\t}\n")
 760         out_java_enum += f"\tstatic constr_from_ptr(ptr: number): {java_hu_type} {{\n"
 761         out_java_enum += (f"\t\tconst raw_val: bindings.{struct_name} = bindings." + struct_name + "_ref_from_ptr(ptr);\n")
 762         java_hu_subclasses = ""
 763
 764         out_java +=  ("\tpublic static class " + struct_name + " {\n")
 765         out_java +=  ("\t\tprivate " + struct_name + "() {}\n")
 766         for var in variant_list:
 767             out_java +=  ("\t\texport class " + var.var_name + " extends " + struct_name + " {\n")
 768             java_hu_subclasses = java_hu_subclasses + "export class " + var.var_name + " extends " + java_hu_type + " {\n"
 769             out_java_enum += ("\t\tif (raw_val instanceof bindings." + struct_name + "." + var.var_name + ") {\n")
 770             out_java_enum += ("\t\t\treturn new " + var.var_name + "(this.ptr, raw_val);\n")
 771             init_meth_params = ""
 772             init_meth_body = ""
 773             hu_conv_body = ""
 774             for idx, field_ty in enumerate(var.fields):
 775                 out_java += ("\t\t\tpublic " + field_ty.java_ty + " " + field_ty.arg_name + ";\n")
 776                 java_hu_subclasses = java_hu_subclasses + "\tpublic " + field_ty.arg_name + f": {field_ty.java_hu_ty};\n"
 777                 if field_ty.to_hu_conv is not None:
 778                     hu_conv_body = hu_conv_body + "\t\tconst " + field_ty.arg_name + f": {field_ty.java_ty} = obj." + field_ty.arg_name + ";\n"
 779                     hu_conv_body = hu_conv_body + "\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
 780                     hu_conv_body = hu_conv_body + "\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
 781                 else:
 782                     hu_conv_body = hu_conv_body + "\t\tthis." + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
 783                 if idx > 0:
 784                     init_meth_params = init_meth_params + ", "
 785                 init_meth_params = init_meth_params + field_ty.java_ty + " " + field_ty.arg_name
 786                 init_meth_body = init_meth_body + "this." + field_ty.arg_name + " = " + field_ty.arg_name + "; "
 787             out_java +=  ("\t\t\t" + var.var_name + "(" + init_meth_params + ") { ")
 788             out_java +=  (init_meth_body)
 789             out_java +=  ("}\n")
 790             out_java += ("\t\t}\n")
 791             out_java_enum += ("\t\t}\n")
 792             java_hu_subclasses = java_hu_subclasses + "\tprivate constructor(ptr: number, obj: bindings." + struct_name + "." + var.var_name + ") {\n\t\tsuper(null, ptr);\n"
 793             java_hu_subclasses = java_hu_subclasses + hu_conv_body
 794             java_hu_subclasses = java_hu_subclasses + "\t}\n}\n"
 795         out_java += ("\t\tstatic native void init();\n")
 796         out_java += ("\t}\n")
 797         out_java_enum += ("\t\tthrow new Error('oops, this should be unreachable'); // Unreachable without extending the (internal) bindings interface\n\t}\n\n")
 798         out_java += ("\tstatic { " + struct_name + ".init(); }\n")
 799         out_java += ("\tpublic static native " + struct_name + " " + struct_name + "_ref_from_ptr(long ptr);\n");
 800
 801         out_c += (self.c_fn_ty_pfx + self.c_complex_enum_pass_ty(struct_name) + " " + self.c_fn_name_pfx + struct_name.replace("_", "_1") + "_1ref_1from_1ptr (" + self.c_fn_args_pfx + ", " + self.ptr_c_ty + " ptr) {\n")
 802         out_c += ("\t" + struct_name + " *obj = (" + struct_name + "*)ptr;\n")
 803         out_c += ("\tswitch(obj->tag) {\n")
 804         for var in variant_list:
 805             out_c += ("\t\tcase " + struct_name + "_" + var.var_name + ": {\n")
 806             c_params = []
 807             for idx, field_map in enumerate(var.fields):
 808                 if field_map.ret_conv is not None:
 809                     out_c += ("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
 810                     out_c += ("obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name)
 811                     out_c += (field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
 812                     c_params.append(field_map.ret_conv_name)
 813                 else:
 814                     c_params.append("obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name)
 815             out_c += ("\t\t\treturn " + self.c_constr_native_complex_enum(struct_name, var.var_name, c_params) + ";\n")
 816             out_c += ("\t\t}\n")
 817         out_c += ("\t\tdefault: abort();\n")
 818         out_c += ("\t}\n}\n")
 819         out_java_enum += ("}\n")
 820         out_java_enum += (java_hu_subclasses)
 821         return (out_java, out_java_enum, out_c)
 822
 823     def map_opaque_struct(self, struct_name):
 824         implementations = ""
 825         method_header = ""
 826         if struct_name.startswith("LDKLocked"):
 827             implementations += "implements AutoCloseable "
 828             method_header = """
 829                 public close() {
 830 """
 831         else:
 832             method_header = """
 833                 protected finalize() {
 834                     super.finalize();
 835 """
 836
 837         out_opaque_struct_human = f"""
 838             {self.hu_struct_file_prefix}
 839
 840             export default class {struct_name.replace("LDK","")} extends CommonBase {implementations}{{
 841                 constructor(_dummy: object, ptr: number) {{
 842                     super(ptr);
 843                 }}
 844
 845                 {method_header}
 846                     if (this.ptr != 0) {{
 847                         bindings.{struct_name.replace("LDK","")}_free(this.ptr);
 848                     }}
 849                 }}
 850 """
 851         return out_opaque_struct_human
 852
 853     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):
 854         out_java = ""
 855         out_c = ""
 856         out_java_struct = None
 857
 858         out_java += ("\tpublic static native ")
 859         out_c += (self.c_fn_ty_pfx)
 860         out_c += (return_type_info.c_ty)
 861         out_java += (return_type_info.java_ty)
 862         if return_type_info.ret_conv is not None:
 863             ret_conv_pfx, ret_conv_sfx = return_type_info.ret_conv
 864         out_java += (" " + method_name + "(")
 865         out_c += (" " + self.c_fn_name_pfx + method_name.replace('_', '_1') + "(" + self.c_fn_args_pfx)
 866
 867         method_argument_string = ""
 868         native_call_argument_string = ""
 869         for idx, arg_conv_info in enumerate(argument_types):
 870             if idx != 0:
 871                 method_argument_string += (", ")
 872                 native_call_argument_string += ', '
 873             if arg_conv_info.c_ty != "void":
 874                 out_c += (", ")
 875             if arg_conv_info.c_ty != "void":
 876                 out_c += (arg_conv_info.c_ty + " " + arg_conv_info.arg_name)
 877                 needs_encoding = arg_conv_info.c_ty in self.wasm_encoding_map
 878                 native_argument = arg_conv_info.arg_name
 879                 if needs_encoding:
 880                     converter = self.wasm_encoding_map[arg_conv_info.c_ty]
 881                     native_argument = f"{converter}({arg_conv_info.arg_name})"
 882                 method_argument_string += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
 883                 native_call_argument_string += native_argument
 884
 885         has_return_value = return_type_info.c_ty != 'void'
 886         needs_decoding = return_type_info.c_ty in self.wasm_decoding_map
 887         return_statement = 'return nativeResponseValue;'
 888         if not has_return_value:
 889             return_statement = '// debug statements here'
 890         elif needs_decoding:
 891             converter = self.wasm_decoding_map[return_type_info.c_ty]
 892             return_statement = f"return {converter}(nativeResponseValue);"
 893
 894         out_java = f"""\texport function {method_name}({method_argument_string}): {return_type_info.java_ty} {{
 895             if(!isWasmInitialized){{
 896                 throw new Error("initializeWasm() must be awaited first!");
 897             }}
 898             const nativeResponseValue = wasm.{method_name}({native_call_argument_string});
 899             {return_statement}\n\t}}
 900         \n"""
 901
 902
 903
 904         if has_out_java_struct:
 905             out_java_struct = ""
 906             if not args_known:
 907                 out_java_struct += ("\t// Skipped " + method_name + "\n")
 908                 has_out_java_struct = False
 909             else:
 910                 meth_n = method_name[len(struct_meth) + 1:]
 911                 if not takes_self:
 912                     out_java_struct += (
 913                             "\tpublic static " + return_type_info.java_hu_ty + " constructor_" + meth_n + "(")
 914                 else:
 915                     out_java_struct += ("\tpublic " + return_type_info.java_hu_ty + " " + meth_n + "(")
 916                 for idx, arg in enumerate(argument_types):
 917                     if idx != 0:
 918                         if not takes_self or idx > 1:
 919                             out_java_struct += (", ")
 920                     elif takes_self:
 921                         continue
 922                     if arg.java_ty != "void":
 923                         if arg.arg_name in default_constructor_args:
 924                             for explode_idx, explode_arg in enumerate(default_constructor_args[arg.arg_name]):
 925                                 if explode_idx != 0:
 926                                     out_java_struct += (", ")
 927                                 out_java_struct += (
 928                                         explode_arg.java_hu_ty + " " + arg.arg_name + "_" + explode_arg.arg_name)
 929                         else:
 930                             out_java_struct += (arg.java_hu_ty + " " + arg.arg_name)
 931
 932         out_c += (") {\n")
 933         if out_java_struct is not None:
 934             out_java_struct += (") {\n")
 935         for info in argument_types:
 936             if info.arg_conv is not None:
 937                 out_c += ("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
 938         if return_type_info.ret_conv is not None:
 939             out_c += ("\t" + ret_conv_pfx.replace('\n', '\n\t'))
 940         elif return_type_info.c_ty != "void":
 941             out_c += ("\t" + return_type_info.c_ty + " ret_val = ")
 942         else:
 943             out_c += ("\t")
 944         if c_call_string is None:
 945             out_c += (method_name + "(")
 946         else:
 947             out_c += (c_call_string)
 948         for idx, info in enumerate(argument_types):
 949             if info.arg_conv_name is not None:
 950                 if idx != 0:
 951                     out_c += (", ")
 952                 elif c_call_string is not None:
 953                     continue
 954                 out_c += (info.arg_conv_name)
 955         out_c += (")")
 956         if return_type_info.ret_conv is not None:
 957             out_c += (ret_conv_sfx.replace('\n', '\n\t'))
 958         else:
 959             out_c += (";")
 960         for info in argument_types:
 961             if info.arg_conv_cleanup is not None:
 962                 out_c += ("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
 963         if return_type_info.ret_conv is not None:
 964             out_c += ("\n\treturn " + return_type_info.ret_conv_name + ";")
 965         elif return_type_info.c_ty != "void":
 966             out_c += ("\n\treturn ret_val;")
 967         out_c += ("\n}\n\n")
 968
 969         if has_out_java_struct:
 970             out_java_struct += ("\t\t")
 971             if return_type_info.java_ty != "void":
 972                 out_java_struct += (return_type_info.java_ty + " ret = ")
 973             out_java_struct += ("bindings." + method_name + "(")
 974             for idx, info in enumerate(argument_types):
 975                 if idx != 0:
 976                     out_java_struct += (", ")
 977                 if idx == 0 and takes_self:
 978                     out_java_struct += ("this.ptr")
 979                 elif info.arg_name in default_constructor_args:
 980                     out_java_struct += ("bindings." + info.java_hu_ty + "_new(")
 981                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
 982                         if explode_idx != 0:
 983                             out_java_struct += (", ")
 984                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
 985                         if explode_arg.from_hu_conv is not None:
 986                             out_java_struct += (
 987                                 explode_arg.from_hu_conv[0].replace(explode_arg.arg_name, expl_arg_name))
 988                         else:
 989                             out_java_struct += (expl_arg_name)
 990                     out_java_struct += (")")
 991                 elif info.from_hu_conv is not None:
 992                     out_java_struct += (info.from_hu_conv[0])
 993                 else:
 994                     out_java_struct += (info.arg_name)
 995             out_java_struct += (");\n")
 996             if return_type_info.to_hu_conv is not None:
 997                 if not takes_self:
 998                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t").replace("this",
 999                                                                                                              return_type_info.to_hu_conv_name) + "\n")
1000                 else:
1001                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t") + "\n")
1002
1003             for idx, info in enumerate(argument_types):
1004                 if idx == 0 and takes_self:
1005                     pass
1006                 elif info.arg_name in default_constructor_args:
1007                     for explode_arg in default_constructor_args[info.arg_name]:
1008                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1009                         if explode_arg.from_hu_conv is not None and return_type_info.to_hu_conv_name:
1010                             out_java_struct += ("\t\t" + explode_arg.from_hu_conv[1].replace(explode_arg.arg_name,
1011                                                                                              expl_arg_name).replace(
1012                                 "this", return_type_info.to_hu_conv_name) + ";\n")
1013                 elif info.from_hu_conv is not None and info.from_hu_conv[1] != "":
1014                     if not takes_self and return_type_info.to_hu_conv_name is not None:
1015                         out_java_struct += (
1016                                 "\t\t" + info.from_hu_conv[1].replace("this", return_type_info.to_hu_conv_name) + ";\n")
1017                     else:
1018                         out_java_struct += ("\t\t" + info.from_hu_conv[1] + ";\n")
1019
1020             if return_type_info.to_hu_conv_name is not None:
1021                 out_java_struct += ("\t\treturn " + return_type_info.to_hu_conv_name + ";\n")
1022             elif return_type_info.java_ty != "void" and return_type_info.rust_obj != "LDK" + struct_meth:
1023                 out_java_struct += ("\t\treturn ret;\n")
1024             out_java_struct += ("\t}\n\n")
1025
1026         return (out_java, out_c, out_java_struct)