_ 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
  76         self.common_base = """
  77             export default class CommonBase {
  78                 ptr: number;
  79                 ptrs_to: object[] = []; // new LinkedList(); TODO: build linked list implementation
  80                 protected constructor(ptr: number) { this.ptr = ptr; }
  81                 public _test_only_get_ptr(): number { return this.ptr; }
  82                 protected finalize() {
  83                     // TODO: finalize myself
  84                 }
  85             }
  86 """
  87
  88         self.c_file_pfx = """#include <rust_types.h>
  89 #include "js-wasm.h"
  90 #include <stdatomic.h>
  91 #include <lightning.h>
  92
  93 // These should be provided...somehow...
  94 void *memset(void *s, int c, size_t n);
  95 void *memcpy(void *dest, const void *src, size_t n);
  96 int memcmp(const void *s1, const void *s2, size_t n);
  97
  98 void __attribute__((noreturn)) abort(void);
  99 void assert(bool expression);
 100 """
 101
 102         if not DEBUG:
 103             self.c_file_pfx = self.c_file_pfx + """
 104 void *malloc(size_t size);
 105 void free(void *ptr);
 106
 107 #define MALLOC(a, _) malloc(a)
 108 #define FREE(p) if ((long)(p) > 1024) { free(p); }
 109 #define DO_ASSERT(a) (void)(a)
 110 #define CHECK(a)
 111 """
 112         else:
 113             self.c_file_pfx = self.c_file_pfx + """
 114 // Always run a, then assert it is true:
 115 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
 116 // Assert a is true or do nothing
 117 #define CHECK(a) DO_ASSERT(a)
 118
 119 // Running a leak check across all the allocations and frees of the JDK is a mess,
 120 // so instead we implement our own naive leak checker here, relying on the -wrap
 121 // linker option to wrap malloc/calloc/realloc/free, tracking everyhing allocated
 122 // and free'd in Rust or C across the generated bindings shared library.
 123
 124 #define BT_MAX 128
 125 typedef struct allocation {
 126         struct allocation* next;
 127         void* ptr;
 128         const char* struct_name;
 129 } allocation;
 130 static allocation* allocation_ll = NULL;
 131
 132 void* __real_malloc(size_t len);
 133 void* __real_calloc(size_t nmemb, size_t len);
 134 static void new_allocation(void* res, const char* struct_name) {
 135         allocation* new_alloc = __real_malloc(sizeof(allocation));
 136         new_alloc->ptr = res;
 137         new_alloc->struct_name = struct_name;
 138         new_alloc->next = allocation_ll;
 139         allocation_ll = new_alloc;
 140 }
 141 static void* MALLOC(size_t len, const char* struct_name) {
 142         void* res = __real_malloc(len);
 143         new_allocation(res, struct_name);
 144         return res;
 145 }
 146 void __real_free(void* ptr);
 147 static void alloc_freed(void* ptr) {
 148         allocation* p = NULL;
 149         allocation* it = allocation_ll;
 150         while (it->ptr != ptr) {
 151                 p = it; it = it->next;
 152                 if (it == NULL) {
 153                         //XXX: fprintf(stderr, "Tried to free unknown pointer %p\\n", ptr);
 154                         return; // addrsan should catch malloc-unknown and print more info than we have
 155                 }
 156         }
 157         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
 158         DO_ASSERT(it->ptr == ptr);
 159         __real_free(it);
 160 }
 161 static void FREE(void* ptr) {
 162         if ((long)ptr < 1024) return; // Rust loves to create pointers to the NULL page for dummys
 163         alloc_freed(ptr);
 164         __real_free(ptr);
 165 }
 166
 167 void* __wrap_malloc(size_t len) {
 168         void* res = __real_malloc(len);
 169         new_allocation(res, "malloc call");
 170         return res;
 171 }
 172 void* __wrap_calloc(size_t nmemb, size_t len) {
 173         void* res = __real_calloc(nmemb, len);
 174         new_allocation(res, "calloc call");
 175         return res;
 176 }
 177 void __wrap_free(void* ptr) {
 178         if (ptr == NULL) return;
 179         alloc_freed(ptr);
 180         __real_free(ptr);
 181 }
 182
 183 void* __real_realloc(void* ptr, size_t newlen);
 184 void* __wrap_realloc(void* ptr, size_t len) {
 185         if (ptr != NULL) alloc_freed(ptr);
 186         void* res = __real_realloc(ptr, len);
 187         new_allocation(res, "realloc call");
 188         return res;
 189 }
 190 void __wrap_reallocarray(void* ptr, size_t new_sz) {
 191         // Rust doesn't seem to use reallocarray currently
 192         DO_ASSERT(false);
 193 }
 194
 195 void __attribute__((destructor)) check_leaks() {
 196         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 197                 //XXX: fprintf(stderr, "%s %p remains\\n", a->struct_name, a->ptr);
 198         }
 199         DO_ASSERT(allocation_ll == NULL);
 200 }
 201 """
 202         self.c_file_pfx = self.c_file_pfx + """
 203 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
 204 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
 205 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
 206 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
 207
 208 _Static_assert(sizeof(void*) == 4, "Pointers mut be 32 bits");
 209
 210 typedef struct int64_tArray { uint32_t *len; /* len + 1 is data */ } int64_tArray;
 211 typedef struct uint32_tArray { uint32_t *len; /* len + 1 is data */ } uint32_tArray;
 212 typedef struct ptrArray { uint32_t *len; /* len + 1 is data */ } ptrArray;
 213 typedef struct int8_tArray { uint32_t *len; /* len + 1 is data */ } int8_tArray;
 214 typedef struct jstring {} jstring;
 215
 216 jstring conv_owned_string(const char* _src) { jstring a; return a; }
 217
 218 typedef bool jboolean;
 219
 220 """
 221
 222         self.hu_struct_file_prefix = f"""
 223 import CommonBase from './CommonBase';
 224 import * as bindings from '../bindings' // TODO: figure out location
 225
 226 """
 227         self.c_fn_ty_pfx = ""
 228         self.c_fn_name_pfx = ""
 229         self.c_fn_args_pfx = "void* ctx_TODO"
 230         self.file_ext = ".ts"
 231         self.ptr_c_ty = "uint32_t"
 232         self.ptr_native_ty = "uint32_t"
 233         self.result_c_ty = "uint32_t"
 234         self.owned_str_to_c_call = ("conv_owned_string(", ")")
 235         self.ptr_arr = "ptrArray"
 236         self.get_native_arr_len_call = ("*", ".len")
 237
 238     def release_native_arr_ptr_call(self, ty_info, arr_var, arr_ptr_var):
 239         return None
 240     def create_native_arr_call(self, arr_len, ty_info):
 241         if ty_info.c_ty == "int8_tArray":
 242             return "{ .len = MALLOC(" + arr_len + " + sizeof(uint32_t), \"Native " + ty_info.c_ty + " Bytes\") }"
 243         elif ty_info.c_ty == "int64_tArray":
 244             return "{ .len = MALLOC(" + arr_len + " * sizeof(int64_t) + sizeof(uint32_t), \"Native " + ty_info.c_ty + " Bytes\") }"
 245         elif ty_info.c_ty == "uint32_tArray":
 246             return "{ .len = MALLOC(" + arr_len + " * sizeof(int32_t) + sizeof(uint32_t), \"Native " + ty_info.c_ty + " Bytes\") }"
 247         elif ty_info.c_ty == "ptrArray":
 248             assert ty_info.subty is not None and ty_info.subty.c_ty.endswith("Array")
 249             return "{ .len = MALLOC(" + arr_len + " * sizeof(int32_t) + sizeof(uint32_t), \"Native Object Bytes\") }"
 250         else:
 251             print("Need to create arr!", ty_info.c_ty)
 252             return ty_info.c_ty
 253     def set_native_arr_contents(self, arr_name, arr_len, ty_info):
 254         if ty_info.c_ty == "int8_tArray":
 255             return ("memcpy(" + arr_name + ".len + 1, ", ", " + arr_len + ")")
 256         else:
 257             assert False
 258     def get_native_arr_contents(self, arr_name, dest_name, arr_len, ty_info, copy):
 259         if ty_info.c_ty == "int8_tArray":
 260             if copy:
 261                 return "memcpy(" + dest_name + ", " + arr_name + ".len + 1, " + arr_len + ")"
 262             else:
 263                 return "(int8_t*)(" + arr_name + ".len + 1)"
 264         else:
 265             return "(" + ty_info.subty.c_ty + "*)(" + arr_name + ".len + 1)"
 266     def get_native_arr_elem(self, arr_name, idxc, ty_info):
 267         assert False # Only called if above is None
 268     def get_native_arr_ptr_call(self, ty_info):
 269         if ty_info.subty is not None:
 270             return "(" + ty_info.subty.c_ty + "*)(", ".len + 1)"
 271         return "(" + ty_info.c_ty + "*)(", ".len + 1)"
 272     def get_native_arr_entry_call(self, ty_info, arr_name, idxc, entry_access):
 273         return None
 274     def cleanup_native_arr_ref_contents(self, arr_name, dest_name, arr_len, ty_info):
 275         if ty_info.c_ty == "int8_tArray":
 276             return None
 277         else:
 278             return None
 279
 280
 281     def wasm_import_header(self, target):
 282         if target == Target.NODEJS:
 283             return """
 284 import * as fs from 'fs';
 285 const source = fs.readFileSync('./ldk.wasm');
 286
 287 const memory = new WebAssembly.Memory({initial: 256});
 288 const wasmModule = new WebAssembly.Module(source);
 289
 290 const imports: any = {};
 291 imports.env = {};
 292
 293 imports.env.memoryBase = 0;
 294 imports.env.memory = memory;
 295 imports.env.tableBase = 0;
 296 imports.env.table = new WebAssembly.Table({initial: 4, element: 'anyfunc'});
 297
 298 imports.env["abort"] = function () {
 299     console.error("ABORT");
 300 };
 301
 302 const wasmInstance = await WebAssembly.instantiate(wasmModule, imports)
 303 const wasm = wasmInstance.exports;
 304
 305 // WASM CODEC
 306
 307 const nextMultipleOfFour = (value: number) => {
 308     return Math.ceil(value / 4) * 4;
 309 }
 310
 311 const encodeArray = (inputArray) => {
 312     // TODO: (matt) is this correct, or should it go back to length * 4?
 313     // const cArrayPointer = wasm.wasm_malloc(inputArray.length * 4);
 314     const cArrayPointer = wasm.wasm_malloc(nextMultipleOfFour(inputArray.length));
 315
 316     const arrayMemoryView = new Uint32Array(memory.buffer, cArrayPointer, inputArray.length);
 317     arrayMemoryView.set(inputArray);
 318     return cArrayPointer;
 319 }
 320
 321 const decodeArray = (arrayPointer, free = true) => {
 322     const arraySizeViewer = new Uint32Array(
 323         memory.buffer, // value
 324         arrayPointer, // offset
 325         1 // one int
 326     );
 327     const arraySize = arraySizeViewer[0];
 328     const actualArrayViewer = new Uint32Array(
 329         memory.buffer, // value
 330         arrayPointer, // offset
 331         arraySize + 1
 332     );
 333     const actualArray = actualArrayViewer.slice(1, arraySize + 1);
 334     if (free) {
 335         // wasm.free_array(arrayPointer);
 336         wasm.wasm_free(arrayPointer); // TODO: check if passing *void still captures remaining values
 337     }
 338     return actualArray;
 339 }
 340
 341 const encodeString = (string) => {
 342     // make malloc count divisible by 4
 343     const memoryNeed = nextMultipleOfFour(string.length + 1);
 344     const stringPointer = wasm.wasm_malloc(memoryNeed);
 345     const stringMemoryView = new Uint8Array(
 346         memory.buffer, // value
 347         stringPointer, // offset
 348         string.length + 1 // length
 349     );
 350     for (let i = 0; i < string.length; i++) {
 351         stringMemoryView[i] = string.charCodeAt(i);
 352     }
 353     stringMemoryView[string.length] = 0;
 354     return stringPointer;
 355 }
 356
 357 const decodeString = (stringPointer, free = true) => {
 358     const memoryView = new Uint8Array(memory.buffer, stringPointer);
 359     let cursor = 0;
 360     let result = '';
 361
 362     while (memoryView[cursor] !== 0) {
 363         result += String.fromCharCode(memoryView[cursor]);
 364         cursor++;
 365     }
 366
 367     if (free) {
 368         wasm.wasm_free(stringPointer);
 369     }
 370
 371     return result;
 372 };
 373 """
 374         return ''
 375
 376     def init_str(self):
 377         return ""
 378
 379     def native_c_unitary_enum_map(self, struct_name, variants):
 380         out_c = "static inline " + struct_name + " " + struct_name + "_from_js(int32_t ord) {\n"
 381         out_c = out_c + "\tswitch (ord) {\n"
 382         ord_v = 0
 383
 384         out_typescript_enum_fields = ""
 385
 386         for var in variants:
 387             out_c = out_c + "\t\tcase %d: return %s;\n" % (ord_v, var)
 388             ord_v = ord_v + 1
 389             out_typescript_enum_fields += f"{var},\n\t\t\t\t"
 390         out_c = out_c + "\t}\n"
 391         out_c = out_c + "\tabort();\n"
 392         out_c = out_c + "}\n"
 393
 394         out_c = out_c + "static inline int32_t " + struct_name + "_to_js(" + struct_name + " val) {\n"
 395         out_c = out_c + "\tswitch (val) {\n"
 396         ord_v = 0
 397         for var in variants:
 398             out_c = out_c + "\t\tcase " + var + ": return %d;\n" % ord_v
 399             ord_v = ord_v + 1
 400         out_c = out_c + "\t\tdefault: abort();\n"
 401         out_c = out_c + "\t}\n"
 402         out_c = out_c + "}\n"
 403
 404         out_typescript_enum = f"""
 405             export enum {struct_name} {{
 406                 {out_typescript_enum_fields}
 407             }}
 408 """
 409
 410         return (out_c, out_typescript_enum, "")
 411
 412     def c_unitary_enum_to_native_call(self, ty_info):
 413         return (ty_info.rust_obj + "_to_js(", ")")
 414     def native_unitary_enum_to_c_call(self, ty_info):
 415         return (ty_info.rust_obj + "_from_js(", ")")
 416
 417     def c_complex_enum_pass_ty(self, struct_name):
 418         return "uint32_t"
 419
 420     def c_constr_native_complex_enum(self, struct_name, variant, c_params):
 421         ret = "0 /* " + struct_name + " - " + variant + " */"
 422         for param in c_params:
 423             ret = ret + "; (void) " + param
 424         return ret
 425
 426     def native_c_map_trait(self, struct_name, field_var_conversions, field_function_lines):
 427         out_typescript_bindings = "\n\n\n// OUT_TYPESCRIPT_BINDINGS :: MAP_TRAIT :: START\n\n"
 428
 429         constructor_arguments = ""
 430         super_instantiator = ""
 431         pointer_to_adder = ""
 432         impl_constructor_arguments = ""
 433         for var in field_var_conversions:
 434             if isinstance(var, ConvInfo):
 435                 constructor_arguments += f", {first_to_lower(var.arg_name)}?: {var.java_hu_ty}"
 436                 impl_constructor_arguments += f", {var.arg_name}: {var.java_hu_ty}"
 437                 if var.from_hu_conv is not None:
 438                     super_instantiator += ", " + var.from_hu_conv[0]
 439                     if var.from_hu_conv[1] != "":
 440                         pointer_to_adder += var.from_hu_conv[1] + ";\n"
 441                 else:
 442                     super_instantiator += ", " + first_to_lower(var.arg_name)
 443             else:
 444                 constructor_arguments += f", {first_to_lower(var[1])}?: bindings.{var[0]}"
 445                 super_instantiator += ", " + first_to_lower(var[1])
 446                 pointer_to_adder += "this.ptrs_to.push(" + first_to_lower(var[1]) + ");\n"
 447                 impl_constructor_arguments += f", {first_to_lower(var[1])}_impl: {var[0].replace('LDK', '')}.{var[0].replace('LDK', '')}Interface"
 448
 449         # BUILD INTERFACE METHODS
 450         out_java_interface = ""
 451         out_interface_implementation_overrides = ""
 452         java_methods = []
 453         for fn_line in field_function_lines:
 454             java_method_descriptor = ""
 455             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 456                 out_java_interface += fn_line.fn_name + "("
 457                 out_interface_implementation_overrides += f"{fn_line.fn_name} ("
 458
 459                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 460                     if idx >= 1:
 461                         out_java_interface += ", "
 462                         out_interface_implementation_overrides += ", "
 463                     out_java_interface += f"{arg_conv_info.arg_name}: {arg_conv_info.java_hu_ty}"
 464                     out_interface_implementation_overrides += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
 465                     java_method_descriptor += arg_conv_info.java_fn_ty_arg
 466                 out_java_interface += f"): {fn_line.ret_ty_info.java_hu_ty};\n\t\t\t\t"
 467                 java_method_descriptor += ")" + fn_line.ret_ty_info.java_fn_ty_arg
 468                 java_methods.append((fn_line.fn_name, java_method_descriptor))
 469
 470                 out_interface_implementation_overrides += f"): {fn_line.ret_ty_info.java_ty} {{\n"
 471
 472                 interface_method_override_inset = "\t\t\t\t\t\t"
 473                 interface_implementation_inset = "\t\t\t\t\t\t\t"
 474                 for arg_info in fn_line.args_ty:
 475                     if arg_info.to_hu_conv is not None:
 476                         out_interface_implementation_overrides += interface_implementation_inset + arg_info.to_hu_conv.replace("\n", "\n\t\t\t\t") + "\n"
 477
 478                 if fn_line.ret_ty_info.java_ty != "void":
 479                     out_interface_implementation_overrides += interface_implementation_inset + fn_line.ret_ty_info.java_hu_ty + " ret = arg." + fn_line.fn_name + "("
 480                 else:
 481                     out_interface_implementation_overrides += f"{interface_implementation_inset}arg." + fn_line.fn_name + "("
 482
 483                 for idx, arg_info in enumerate(fn_line.args_ty):
 484                     if idx != 0:
 485                         out_interface_implementation_overrides += ", "
 486                     if arg_info.to_hu_conv_name is not None:
 487                         out_interface_implementation_overrides += arg_info.to_hu_conv_name
 488                     else:
 489                         out_interface_implementation_overrides += arg_info.arg_name
 490
 491                 out_interface_implementation_overrides += ");\n"
 492                 if fn_line.ret_ty_info.java_ty != "void":
 493                     if fn_line.ret_ty_info.from_hu_conv is not None:
 494                         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"
 495                         if fn_line.ret_ty_info.from_hu_conv[1] != "":
 496                             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"
 497                         #if fn_line.ret_ty_info.rust_obj in result_types:
 498                         # XXX: We need to handle this in conversion logic so that its cross-language!
 499                         # Avoid double-free by breaking the result - we should learn to clone these and then we can be safe instead
 500                         #    out_interface_implementation_overrides = out_interface_implementation_overrides + "\t\t\t\tret.ptr = 0;\n"
 501                         out_interface_implementation_overrides = out_interface_implementation_overrides + "\t\t\t\treturn result;\n"
 502                     else:
 503                         out_interface_implementation_overrides = out_interface_implementation_overrides + "\t\t\t\treturn ret;\n"
 504                 out_interface_implementation_overrides += f"{interface_method_override_inset}}},\n\n{interface_method_override_inset}"
 505
 506         trait_constructor_arguments = ""
 507         for var in field_var_conversions:
 508             if isinstance(var, ConvInfo):
 509                 trait_constructor_arguments += ", " + var.arg_name
 510             else:
 511                 trait_constructor_arguments += ", " + var[1] + ".new_impl(" + var[1] + "_impl).bindings_instance"
 512
 513         out_typescript_human = f"""
 514             {self.hu_struct_file_prefix}
 515
 516             export class {struct_name.replace("LDK","")} extends CommonBase {{
 517
 518                 bindings_instance?: bindings.{struct_name};
 519
 520                 constructor(ptr?: number, arg?: bindings.{struct_name}{constructor_arguments}) {{
 521                     if (Number.isFinite(ptr)) {{
 522                                         super(ptr);
 523                                         this.bindings_instance = null;
 524                                     }} else {{
 525                                         // TODO: private constructor instantiation
 526                                         super(bindings.{struct_name}_new(arg{super_instantiator}));
 527                                         this.ptrs_to.push(arg);
 528                                         {pointer_to_adder}
 529                                     }}
 530                 }}
 531
 532                 protected finalize() {{
 533                     if (this.ptr != 0) {{
 534                         bindings.{struct_name.replace("LDK","")}_free(this.ptr);
 535                     }}
 536                     super.finalize();
 537                 }}
 538
 539                 static new_impl(arg: {struct_name.replace("LDK", "")}Interface{impl_constructor_arguments}): {struct_name.replace("LDK", "")} {{
 540                     const impl_holder: {struct_name}Holder = new {struct_name}Holder();
 541                     let structImplementation = <bindings.{struct_name}>{{
 542                         // todo: in-line interface filling
 543                         {out_interface_implementation_overrides}
 544                     }};
 545                     impl_holder.held = new {struct_name.replace("LDK", "")} (null, structImplementation{trait_constructor_arguments});
 546                 }}
 547             }}
 548
 549             export interface {struct_name.replace("LDK", "")}Interface {{
 550                 {out_java_interface}
 551             }}
 552
 553             class {struct_name}Holder {{
 554                 held: {struct_name.replace("LDK", "")};
 555             }}
 556 """
 557
 558         out_typescript_bindings += "\t\texport interface " + struct_name + " {\n"
 559         java_meths = []
 560         for fn_line in field_function_lines:
 561             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 562                 out_typescript_bindings += f"\t\t\t{fn_line.fn_name} ("
 563
 564                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 565                     if idx >= 1:
 566                         out_typescript_bindings = out_typescript_bindings + ", "
 567                     out_typescript_bindings += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
 568
 569                 out_typescript_bindings += f"): {fn_line.ret_ty_info.java_ty};\n"
 570
 571         out_typescript_bindings = out_typescript_bindings + "\t\t}\n\n"
 572
 573         out_typescript_bindings += f"\t\texport function {struct_name}_new(impl: {struct_name}"
 574         for var in field_var_conversions:
 575             if isinstance(var, ConvInfo):
 576                 out_typescript_bindings += f", {var.arg_name}: {var.java_ty}"
 577             else:
 578                 out_typescript_bindings += f", {var[1]}: {var[0]}"
 579
 580         out_typescript_bindings += f"""): number {{
 581             throw new Error('unimplemented'); // TODO: bind to WASM
 582         }}
 583 """
 584
 585         out_typescript_bindings += '\n// OUT_TYPESCRIPT_BINDINGS :: MAP_TRAIT :: END\n\n\n'
 586
 587         # Now that we've written out our java code (and created java_meths), generate C
 588         out_c = "typedef struct " + struct_name + "_JCalls {\n"
 589         out_c = out_c + "\tatomic_size_t refcnt;\n"
 590         out_c = out_c + "\t// TODO: Object pointer o;\n"
 591         for var in field_var_conversions:
 592             if isinstance(var, ConvInfo):
 593                 # We're a regular ol' field
 594                 pass
 595             else:
 596                 # We're a supertrait
 597                 out_c = out_c + "\t" + var[0] + "_JCalls* " + var[1] + ";\n"
 598         for fn in field_function_lines:
 599             if fn.fn_name != "free" and fn.fn_name != "clone":
 600                 out_c = out_c + "\t// TODO: Some kind of method pointer " + fn.fn_name + "_meth;\n"
 601         out_c = out_c + "} " + struct_name + "_JCalls;\n"
 602
 603         for fn_line in field_function_lines:
 604             if fn_line.fn_name == "free":
 605                 out_c = out_c + "static void " + struct_name + "_JCalls_free(void* this_arg) {\n"
 606                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 607                 out_c = out_c + "\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n"
 608                 out_c = out_c + "\t\t// TODO: do any release required for j_calls->o (refcnt-- in java, but may be redundant)\n"
 609                 out_c = out_c + "\t\tFREE(j_calls);\n"
 610                 out_c = out_c + "\t}\n}\n"
 611
 612         for idx, fn_line in enumerate(field_function_lines):
 613             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 614                 assert fn_line.ret_ty_info.ty_info.get_full_rust_ty()[1] == ""
 615                 out_c = out_c + fn_line.ret_ty_info.ty_info.get_full_rust_ty()[0] + " " + fn_line.fn_name + "_jcall("
 616                 if fn_line.self_is_const:
 617                     out_c = out_c + "const void* this_arg"
 618                 else:
 619                     out_c = out_c + "void* this_arg"
 620
 621                 for idx, arg in enumerate(fn_line.args_ty):
 622                     out_c = out_c + ", " + arg.ty_info.get_full_rust_ty()[0] + " " + arg.arg_name + arg.ty_info.get_full_rust_ty()[1]
 623
 624                 out_c = out_c + ") {\n"
 625                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 626
 627                 for arg_info in fn_line.args_ty:
 628                     if arg_info.ret_conv is not None:
 629                         out_c = out_c + "\t" + arg_info.ret_conv[0].replace('\n', '\n\t')
 630                         out_c = out_c + arg_info.arg_name
 631                         out_c = out_c + arg_info.ret_conv[1].replace('\n', '\n\t') + "\n"
 632
 633                 out_c = out_c + "\t//TODO: jobject obj = get object we can call against on j_calls->o\n"
 634                 if fn_line.ret_ty_info.c_ty.endswith("Array"):
 635                     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"
 636                 elif fn_line.ret_ty_info.java_ty == "void":
 637                     out_c = out_c + "\treturn; //TODO: Call " + fn_line.fn_name + " on j_calls with instance obj"
 638                 elif not fn_line.ret_ty_info.passed_as_ptr:
 639                     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
 640                 else:
 641                     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"
 642
 643                 for idx, arg_info in enumerate(fn_line.args_ty):
 644                     if arg_info.ret_conv is not None:
 645                         out_c = out_c + ", " + arg_info.ret_conv_name
 646                     else:
 647                         out_c = out_c + ", " + arg_info.arg_name
 648                 out_c = out_c + ");\n"
 649                 if fn_line.ret_ty_info.arg_conv is not None:
 650                     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"
 651
 652                 out_c = out_c + "}\n"
 653
 654         # Write out a clone function whether we need one or not, as we use them in moving to rust
 655         out_c = out_c + "static void* " + struct_name + "_JCalls_clone(const void* this_arg) {\n"
 656         out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 657         out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n"
 658         for var in field_var_conversions:
 659             if not isinstance(var, ConvInfo):
 660                 out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->" + var[1] + "->refcnt, 1, memory_order_release);\n"
 661         out_c = out_c + "\treturn (void*) this_arg;\n"
 662         out_c = out_c + "}\n"
 663
 664         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_init (" + self.c_fn_args_pfx + ", /*TODO: JS Object Reference */void* o"
 665         for var in field_var_conversions:
 666             if isinstance(var, ConvInfo):
 667                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 668             else:
 669                 out_c = out_c + ", /*TODO: JS Object Reference */void* " + var[1]
 670         out_c = out_c + ") {\n"
 671
 672         out_c = out_c + "\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n"
 673         out_c = out_c + "\tatomic_init(&calls->refcnt, 1);\n"
 674         out_c = out_c + "\t//TODO: Assign calls->o from o\n"
 675
 676         for (fn_name, java_meth_descr) in java_meths:
 677             if fn_name != "free" and fn_name != "clone":
 678                 out_c = out_c + "\tcalls->" + fn_name + "_meth = (*env)->GetMethodID(env, c, \"" + fn_name + "\", \"" + java_meth_descr + "\");\n"
 679                 out_c = out_c + "\tCHECK(calls->" + fn_name + "_meth != NULL);\n"
 680
 681         for var in field_var_conversions:
 682             if isinstance(var, ConvInfo) and var.arg_conv is not None:
 683                 out_c = out_c + "\n\t" + var.arg_conv.replace("\n", "\n\t") +"\n"
 684         out_c = out_c + "\n\t" + struct_name + " ret = {\n"
 685         out_c = out_c + "\t\t.this_arg = (void*) calls,\n"
 686         for fn_line in field_function_lines:
 687             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 688                 out_c = out_c + "\t\t." + fn_line.fn_name + " = " + fn_line.fn_name + "_jcall,\n"
 689             elif fn_line.fn_name == "free":
 690                 out_c = out_c + "\t\t.free = " + struct_name + "_JCalls_free,\n"
 691             else:
 692                 out_c = out_c + "\t\t.clone = " + struct_name + "_JCalls_clone,\n"
 693         for var in field_var_conversions:
 694             if isinstance(var, ConvInfo):
 695                 if var.arg_conv_name is not None:
 696                     out_c = out_c + "\t\t." + var.arg_name + " = " + var.arg_conv_name + ",\n"
 697                     out_c = out_c + "\t\t.set_" + var.arg_name + " = NULL,\n"
 698                 else:
 699                     out_c = out_c + "\t\t." + var.var_name + " = " + var.var_name + ",\n"
 700                     out_c = out_c + "\t\t.set_" + var.var_name + " = NULL,\n"
 701             else:
 702                 out_c = out_c + "\t\t." + var[1] + " = " + var[0] + "_init(NULL, " + var[1] + "),\n"
 703         out_c = out_c + "\t};\n"
 704         for var in field_var_conversions:
 705             if not isinstance(var, ConvInfo):
 706                 out_c = out_c + "\tcalls->" + var[1] + " = ret." + var[1] + ".this_arg;\n"
 707         out_c = out_c + "\treturn ret;\n"
 708         out_c = out_c + "}\n"
 709
 710         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"
 711         for var in field_var_conversions:
 712             if isinstance(var, ConvInfo):
 713                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 714             else:
 715                 out_c = out_c + ", /*TODO: JS Object Reference */ void* " + var[1]
 716         out_c = out_c + ") {\n"
 717         out_c = out_c + "\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n"
 718         out_c = out_c + "\t*res_ptr = " + struct_name + "_init(NULL, o"
 719         for var in field_var_conversions:
 720             if isinstance(var, ConvInfo):
 721                 out_c = out_c + ", " + var.arg_name
 722             else:
 723                 out_c = out_c + ", " + var[1]
 724         out_c = out_c + ");\n"
 725         out_c = out_c + "\treturn (long)res_ptr;\n"
 726         out_c = out_c + "}\n"
 727
 728         return (out_typescript_bindings, out_typescript_human, out_c)
 729
 730     def trait_struct_inc_refcnt(self, ty_info):
 731         return ""
 732
 733     def map_complex_enum(self, struct_name, variant_list, camel_to_snake):
 734         java_hu_type = struct_name.replace("LDK", "")
 735
 736         out_java_enum = ""
 737         out_java = ""
 738         out_c = ""
 739
 740         out_java_enum += (self.hu_struct_file_prefix)
 741         out_java_enum += ("export default class " + java_hu_type + " extends CommonBase {\n")
 742         out_java_enum += ("\tprotected constructor(_dummy: object, ptr: number) { super(ptr); }\n")
 743         out_java_enum += ("\tprotected finalize() {\n")
 744         out_java_enum += ("\t\tsuper.finalize();\n")
 745         out_java_enum += ("\t\tif (this.ptr != 0) { bindings." + java_hu_type + "_free(this.ptr); }\n")
 746         out_java_enum += ("\t}\n")
 747         out_java_enum += f"\tstatic constr_from_ptr(ptr: number): {java_hu_type} {{\n"
 748         out_java_enum += (f"\t\tconst raw_val: bindings.{struct_name} = bindings." + struct_name + "_ref_from_ptr(ptr);\n")
 749         java_hu_subclasses = ""
 750
 751         out_java +=  ("\tpublic static class " + struct_name + " {\n")
 752         out_java +=  ("\t\tprivate " + struct_name + "() {}\n")
 753         for var in variant_list:
 754             out_java +=  ("\t\texport class " + var.var_name + " extends " + struct_name + " {\n")
 755             java_hu_subclasses = java_hu_subclasses + "export class " + var.var_name + " extends " + java_hu_type + " {\n"
 756             out_java_enum += ("\t\tif (raw_val instanceof bindings." + struct_name + "." + var.var_name + ") {\n")
 757             out_java_enum += ("\t\t\treturn new " + var.var_name + "(this.ptr, raw_val);\n")
 758             init_meth_params = ""
 759             init_meth_body = ""
 760             hu_conv_body = ""
 761             for idx, field_ty in enumerate(var.fields):
 762                 out_java += ("\t\t\tpublic " + field_ty.java_ty + " " + field_ty.arg_name + ";\n")
 763                 java_hu_subclasses = java_hu_subclasses + "\tpublic " + field_ty.arg_name + f": {field_ty.java_hu_ty};\n"
 764                 if field_ty.to_hu_conv is not None:
 765                     hu_conv_body = hu_conv_body + "\t\tconst " + field_ty.arg_name + f": {field_ty.java_ty} = obj." + field_ty.arg_name + ";\n"
 766                     hu_conv_body = hu_conv_body + "\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
 767                     hu_conv_body = hu_conv_body + "\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
 768                 else:
 769                     hu_conv_body = hu_conv_body + "\t\tthis." + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
 770                 if idx > 0:
 771                     init_meth_params = init_meth_params + ", "
 772                 init_meth_params = init_meth_params + field_ty.java_ty + " " + field_ty.arg_name
 773                 init_meth_body = init_meth_body + "this." + field_ty.arg_name + " = " + field_ty.arg_name + "; "
 774             out_java +=  ("\t\t\t" + var.var_name + "(" + init_meth_params + ") { ")
 775             out_java +=  (init_meth_body)
 776             out_java +=  ("}\n")
 777             out_java += ("\t\t}\n")
 778             out_java_enum += ("\t\t}\n")
 779             java_hu_subclasses = java_hu_subclasses + "\tprivate constructor(ptr: number, obj: bindings." + struct_name + "." + var.var_name + ") {\n\t\tsuper(null, ptr);\n"
 780             java_hu_subclasses = java_hu_subclasses + hu_conv_body
 781             java_hu_subclasses = java_hu_subclasses + "\t}\n}\n"
 782         out_java += ("\t\tstatic native void init();\n")
 783         out_java += ("\t}\n")
 784         out_java_enum += ("\t\tthrow new Error('oops, this should be unreachable'); // Unreachable without extending the (internal) bindings interface\n\t}\n\n")
 785         out_java += ("\tstatic { " + struct_name + ".init(); }\n")
 786         out_java += ("\tpublic static native " + struct_name + " " + struct_name + "_ref_from_ptr(long ptr);\n");
 787
 788         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")
 789         out_c += ("\t" + struct_name + " *obj = (" + struct_name + "*)ptr;\n")
 790         out_c += ("\tswitch(obj->tag) {\n")
 791         for var in variant_list:
 792             out_c += ("\t\tcase " + struct_name + "_" + var.var_name + ": {\n")
 793             c_params = []
 794             for idx, field_map in enumerate(var.fields):
 795                 if field_map.ret_conv is not None:
 796                     out_c += ("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
 797                     out_c += ("obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name)
 798                     out_c += (field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
 799                     c_params.append(field_map.ret_conv_name)
 800                 else:
 801                     c_params.append("obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name)
 802             out_c += ("\t\t\treturn " + self.c_constr_native_complex_enum(struct_name, var.var_name, c_params) + ";\n")
 803             out_c += ("\t\t}\n")
 804         out_c += ("\t\tdefault: abort();\n")
 805         out_c += ("\t}\n}\n")
 806         out_java_enum += ("}\n")
 807         out_java_enum += (java_hu_subclasses)
 808         return (out_java, out_java_enum, out_c)
 809
 810     def map_opaque_struct(self, struct_name):
 811         implementations = ""
 812         method_header = ""
 813         if struct_name.startswith("LDKLocked"):
 814             implementations += "implements AutoCloseable "
 815             method_header = """
 816                 public close() {
 817 """
 818         else:
 819             method_header = """
 820                 protected finalize() {
 821                     super.finalize();
 822 """
 823
 824         out_opaque_struct_human = f"""
 825             {self.hu_struct_file_prefix}
 826
 827             export default class {struct_name.replace("LDK","")} extends CommonBase {implementations}{{
 828                 constructor(_dummy: object, ptr: number) {{
 829                     super(ptr);
 830                 }}
 831
 832                 {method_header}
 833                     if (this.ptr != 0) {{
 834                         bindings.{struct_name.replace("LDK","")}_free(this.ptr);
 835                     }}
 836                 }}
 837 """
 838         return out_opaque_struct_human
 839
 840     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):
 841         out_java = ""
 842         out_c = ""
 843         out_java_struct = None
 844
 845         out_java += ("\tpublic static native ")
 846         out_c += (self.c_fn_ty_pfx)
 847         out_c += (return_type_info.c_ty)
 848         out_java += (return_type_info.java_ty)
 849         if return_type_info.ret_conv is not None:
 850             ret_conv_pfx, ret_conv_sfx = return_type_info.ret_conv
 851         out_java += (" " + method_name + "(")
 852         out_c += (" " + self.c_fn_name_pfx + method_name.replace('_', '_1') + "(" + self.c_fn_args_pfx)
 853
 854         method_argument_string = ""
 855         native_call_argument_string = ""
 856         for idx, arg_conv_info in enumerate(argument_types):
 857             if idx != 0:
 858                 method_argument_string += (", ")
 859                 native_call_argument_string += ', '
 860             if arg_conv_info.c_ty != "void":
 861                 out_c += (", ")
 862             if arg_conv_info.c_ty != "void":
 863                 out_c += (arg_conv_info.c_ty + " " + arg_conv_info.arg_name)
 864                 needs_encoding = arg_conv_info.c_ty in self.wasm_encoding_map
 865                 native_argument = arg_conv_info.arg_name
 866                 if needs_encoding:
 867                     converter = self.wasm_encoding_map[arg_conv_info.c_ty]
 868                     native_argument = f"{converter}({arg_conv_info.arg_name})"
 869                 method_argument_string += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
 870                 native_call_argument_string += native_argument
 871
 872         needs_decoding = return_type_info.c_ty in self.wasm_decoding_map
 873         return_value = 'nativeResponseValue'
 874         if needs_decoding:
 875             converter = self.wasm_decoding_map[return_type_info.c_ty]
 876             return_value = f"{converter}(nativeResponseValue)"
 877
 878         out_java = f"""\texport function {method_name}({method_argument_string}): {return_type_info.java_ty} {{
 879             const nativeResponseValue = wasm.{method_name}({native_call_argument_string});
 880             return {return_value};
 881         \n\t}}
 882         \n"""
 883
 884
 885
 886         if has_out_java_struct:
 887             out_java_struct = ""
 888             if not args_known:
 889                 out_java_struct += ("\t// Skipped " + method_name + "\n")
 890                 has_out_java_struct = False
 891             else:
 892                 meth_n = method_name[len(struct_meth) + 1:]
 893                 if not takes_self:
 894                     out_java_struct += (
 895                             "\tpublic static " + return_type_info.java_hu_ty + " constructor_" + meth_n + "(")
 896                 else:
 897                     out_java_struct += ("\tpublic " + return_type_info.java_hu_ty + " " + meth_n + "(")
 898                 for idx, arg in enumerate(argument_types):
 899                     if idx != 0:
 900                         if not takes_self or idx > 1:
 901                             out_java_struct += (", ")
 902                     elif takes_self:
 903                         continue
 904                     if arg.java_ty != "void":
 905                         if arg.arg_name in default_constructor_args:
 906                             for explode_idx, explode_arg in enumerate(default_constructor_args[arg.arg_name]):
 907                                 if explode_idx != 0:
 908                                     out_java_struct += (", ")
 909                                 out_java_struct += (
 910                                         explode_arg.java_hu_ty + " " + arg.arg_name + "_" + explode_arg.arg_name)
 911                         else:
 912                             out_java_struct += (arg.java_hu_ty + " " + arg.arg_name)
 913
 914         out_c += (") {\n")
 915         if out_java_struct is not None:
 916             out_java_struct += (") {\n")
 917         for info in argument_types:
 918             if info.arg_conv is not None:
 919                 out_c += ("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
 920         if return_type_info.ret_conv is not None:
 921             out_c += ("\t" + ret_conv_pfx.replace('\n', '\n\t'))
 922         elif return_type_info.c_ty != "void":
 923             out_c += ("\t" + return_type_info.c_ty + " ret_val = ")
 924         else:
 925             out_c += ("\t")
 926         if c_call_string is None:
 927             out_c += (method_name + "(")
 928         else:
 929             out_c += (c_call_string)
 930         for idx, info in enumerate(argument_types):
 931             if info.arg_conv_name is not None:
 932                 if idx != 0:
 933                     out_c += (", ")
 934                 elif c_call_string is not None:
 935                     continue
 936                 out_c += (info.arg_conv_name)
 937         out_c += (")")
 938         if return_type_info.ret_conv is not None:
 939             out_c += (ret_conv_sfx.replace('\n', '\n\t'))
 940         else:
 941             out_c += (";")
 942         for info in argument_types:
 943             if info.arg_conv_cleanup is not None:
 944                 out_c += ("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
 945         if return_type_info.ret_conv is not None:
 946             out_c += ("\n\treturn " + return_type_info.ret_conv_name + ";")
 947         elif return_type_info.c_ty != "void":
 948             out_c += ("\n\treturn ret_val;")
 949         out_c += ("\n}\n\n")
 950
 951         if has_out_java_struct:
 952             out_java_struct += ("\t\t")
 953             if return_type_info.java_ty != "void":
 954                 out_java_struct += (return_type_info.java_ty + " ret = ")
 955             out_java_struct += ("bindings." + method_name + "(")
 956             for idx, info in enumerate(argument_types):
 957                 if idx != 0:
 958                     out_java_struct += (", ")
 959                 if idx == 0 and takes_self:
 960                     out_java_struct += ("this.ptr")
 961                 elif info.arg_name in default_constructor_args:
 962                     out_java_struct += ("bindings." + info.java_hu_ty + "_new(")
 963                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
 964                         if explode_idx != 0:
 965                             out_java_struct += (", ")
 966                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
 967                         if explode_arg.from_hu_conv is not None:
 968                             out_java_struct += (
 969                                 explode_arg.from_hu_conv[0].replace(explode_arg.arg_name, expl_arg_name))
 970                         else:
 971                             out_java_struct += (expl_arg_name)
 972                     out_java_struct += (")")
 973                 elif info.from_hu_conv is not None:
 974                     out_java_struct += (info.from_hu_conv[0])
 975                 else:
 976                     out_java_struct += (info.arg_name)
 977             out_java_struct += (");\n")
 978             if return_type_info.to_hu_conv is not None:
 979                 if not takes_self:
 980                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t").replace("this",
 981                                                                                                              return_type_info.to_hu_conv_name) + "\n")
 982                 else:
 983                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t") + "\n")
 984
 985             for idx, info in enumerate(argument_types):
 986                 if idx == 0 and takes_self:
 987                     pass
 988                 elif info.arg_name in default_constructor_args:
 989                     for explode_arg in default_constructor_args[info.arg_name]:
 990                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
 991                         if explode_arg.from_hu_conv is not None and return_type_info.to_hu_conv_name:
 992                             out_java_struct += ("\t\t" + explode_arg.from_hu_conv[1].replace(explode_arg.arg_name,
 993                                                                                              expl_arg_name).replace(
 994                                 "this", return_type_info.to_hu_conv_name) + ";\n")
 995                 elif info.from_hu_conv is not None and info.from_hu_conv[1] != "":
 996                     if not takes_self and return_type_info.to_hu_conv_name is not None:
 997                         out_java_struct += (
 998                                 "\t\t" + info.from_hu_conv[1].replace("this", return_type_info.to_hu_conv_name) + ";\n")
 999                     else:
1000                         out_java_struct += ("\t\t" + info.from_hu_conv[1] + ";\n")
1001
1002             if return_type_info.to_hu_conv_name is not None:
1003                 out_java_struct += ("\t\treturn " + return_type_info.to_hu_conv_name + ";\n")
1004             elif return_type_info.java_ty != "void" and return_type_info.rust_obj != "LDK" + struct_meth:
1005                 out_java_struct += ("\t\treturn ret;\n")
1006             out_java_struct += ("\t}\n\n")
1007
1008         return (out_java, out_c, out_java_struct)