_ 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             long = ['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 <stdatomic.h>
  90 #include <lightning.h>
  91
  92 // These should be provided...somehow...
  93 void *memset(void *s, int c, size_t n);
  94 void *memcpy(void *dest, const void *src, size_t n);
  95 int memcmp(const void *s1, const void *s2, size_t n);
  96
  97 void __attribute__((noreturn)) abort(void);
  98 void assert(scalar expression);
  99 """
 100
 101         if not DEBUG:
 102             self.c_file_pfx = self.c_file_pfx + """
 103 void *malloc(size_t size);
 104 void free(void *ptr);
 105
 106 #define MALLOC(a, _) malloc(a)
 107 #define FREE(p) if ((long)(p) > 1024) { free(p); }
 108 #define DO_ASSERT(a) (void)(a)
 109 #define CHECK(a)
 110 """
 111         else:
 112             self.c_file_pfx = self.c_file_pfx + """
 113 // Always run a, then assert it is true:
 114 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
 115 // Assert a is true or do nothing
 116 #define CHECK(a) DO_ASSERT(a)
 117
 118 // Running a leak check across all the allocations and frees of the JDK is a mess,
 119 // so instead we implement our own naive leak checker here, relying on the -wrap
 120 // linker option to wrap malloc/calloc/realloc/free, tracking everyhing allocated
 121 // and free'd in Rust or C across the generated bindings shared library.
 122
 123 #define BT_MAX 128
 124 typedef struct allocation {
 125         struct allocation* next;
 126         void* ptr;
 127         const char* struct_name;
 128 } allocation;
 129 static allocation* allocation_ll = NULL;
 130
 131 void* __real_malloc(size_t len);
 132 void* __real_calloc(size_t nmemb, size_t len);
 133 static void new_allocation(void* res, const char* struct_name) {
 134         allocation* new_alloc = __real_malloc(sizeof(allocation));
 135         new_alloc->ptr = res;
 136         new_alloc->struct_name = struct_name;
 137         new_alloc->next = allocation_ll;
 138         allocation_ll = new_alloc;
 139 }
 140 static void* MALLOC(size_t len, const char* struct_name) {
 141         void* res = __real_malloc(len);
 142         new_allocation(res, struct_name);
 143         return res;
 144 }
 145 void __real_free(void* ptr);
 146 static void alloc_freed(void* ptr) {
 147         allocation* p = NULL;
 148         allocation* it = allocation_ll;
 149         while (it->ptr != ptr) {
 150                 p = it; it = it->next;
 151                 if (it == NULL) {
 152                         //XXX: fprintf(stderr, "Tried to free unknown pointer %p\\n", ptr);
 153                         return; // addrsan should catch malloc-unknown and print more info than we have
 154                 }
 155         }
 156         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
 157         DO_ASSERT(it->ptr == ptr);
 158         __real_free(it);
 159 }
 160 static void FREE(void* ptr) {
 161         if ((long)ptr < 1024) return; // Rust loves to create pointers to the NULL page for dummys
 162         alloc_freed(ptr);
 163         __real_free(ptr);
 164 }
 165
 166 void* __wrap_malloc(size_t len) {
 167         void* res = __real_malloc(len);
 168         new_allocation(res, "malloc call");
 169         return res;
 170 }
 171 void* __wrap_calloc(size_t nmemb, size_t len) {
 172         void* res = __real_calloc(nmemb, len);
 173         new_allocation(res, "calloc call");
 174         return res;
 175 }
 176 void __wrap_free(void* ptr) {
 177         if (ptr == NULL) return;
 178         alloc_freed(ptr);
 179         __real_free(ptr);
 180 }
 181
 182 void* __real_realloc(void* ptr, size_t newlen);
 183 void* __wrap_realloc(void* ptr, size_t len) {
 184         if (ptr != NULL) alloc_freed(ptr);
 185         void* res = __real_realloc(ptr, len);
 186         new_allocation(res, "realloc call");
 187         return res;
 188 }
 189 void __wrap_reallocarray(void* ptr, size_t new_sz) {
 190         // Rust doesn't seem to use reallocarray currently
 191         DO_ASSERT(false);
 192 }
 193
 194 void __attribute__((destructor)) check_leaks() {
 195         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 196                 //XXX: fprintf(stderr, "%s %p remains\\n", a->struct_name, a->ptr);
 197         }
 198         DO_ASSERT(allocation_ll == NULL);
 199 }
 200 """
 201         self.c_file_pfx = self.c_file_pfx + """
 202 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
 203 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
 204 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
 205 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
 206
 207 _Static_assert(sizeof(void*) == 4, "Pointers mut be 32 bits");
 208
 209 typedef struct int64_tArray {uint32_t len;int64_t *ptr;} int64_tArray;
 210 typedef struct uint32_tArray {uint32_t len;int32_t *ptr;} uint32_tArray;
 211 typedef struct int8_tArray {uint32_t len;int8_t *ptr;} int8_tArray;
 212
 213 typedef bool jboolean;
 214
 215 """
 216
 217         self.hu_struct_file_prefix = f"""
 218 import CommonBase from './CommonBase';
 219 import * as bindings from '../bindings' // TODO: figure out location
 220
 221 """
 222         self.c_fn_ty_pfx = ""
 223         self.c_fn_name_pfx = ""
 224         self.c_fn_args_pfx = "void* ctx_TODO"
 225         self.file_ext = ".ts"
 226         self.ptr_c_ty = "uint32_t"
 227         self.ptr_native_ty = "number" # "uint32_t"
 228         self.result_c_ty = "uint32_t"
 229         self.ptr_arr = "uint32_tArray"
 230         self.get_native_arr_len_call = ("", ".len")
 231         self.get_native_arr_ptr_call = ("", ".ptr")
 232
 233     def release_native_arr_ptr_call(self, arr_var, arr_ptr_var):
 234         return None
 235     def create_native_arr_call(self, arr_len, ty_info):
 236         if ty_info.c_ty == "int8_tArray":
 237             return "{ .len = " + arr_len + ", .ptr = MALLOC(" + arr_len + ", \"Native " + ty_info.c_ty + " Bytes\") }"
 238         elif ty_info.c_ty == "int64_tArray":
 239             return "{ .len = " + arr_len + ", .ptr = MALLOC(" + arr_len + " * sizeof(int64_t), \"Native " + ty_info.c_ty + " Bytes\") }"
 240         elif ty_info.c_ty == "uint32_tArray":
 241             return "{ .len = " + arr_len + ", .ptr = MALLOC(" + arr_len + " * sizeof(int32_t), \"Native " + ty_info.c_ty + " Bytes\") }"
 242         else:
 243             print("Need to create arr!", ty_info.c_ty)
 244             return ty_info.c_ty
 245     def set_native_arr_contents(self, arr_name, arr_len, ty_info):
 246         if ty_info.c_ty == "int8_tArray":
 247             return ("memcpy(" + arr_name + ".ptr, ", ", " + arr_len + ")")
 248         else:
 249             assert False
 250     def get_native_arr_contents(self, arr_name, dest_name, arr_len, ty_info, copy):
 251         if ty_info.c_ty == "int8_tArray":
 252             if copy:
 253                 return "memcpy(" + dest_name + ", " + arr_name + ".ptr, " + arr_len + ")"
 254             else:
 255                 return arr_name + ".ptr"
 256         else:
 257             return "(" + ty_info.subty.c_ty + "*) " + arr_name + ".ptr"
 258     def get_native_arr_elem(self, arr_name, idxc, ty_info):
 259         assert False # Only called if above is None
 260     def cleanup_native_arr_ref_contents(self, arr_name, dest_name, arr_len, ty_info):
 261         if ty_info.c_ty == "int8_tArray":
 262             return None
 263         else:
 264             return None
 265
 266
 267     def wasm_import_header(self, target):
 268         if target == Target.NODEJS:
 269             return """
 270
 271 import * as fs from 'fs';
 272 const source = fs.readFileSync('./ldk.wasm');
 273
 274 const memory = new WebAssembly.Memory({initial: 256});
 275 const wasmModule = new WebAssembly.Module(source);
 276
 277 const imports: any = {};
 278 imports.env = {};
 279
 280 imports.env.memoryBase = 0;
 281 imports.env.memory = memory;
 282 imports.env.tableBase = 0;
 283 imports.env.table = new WebAssembly.Table({initial: 4, element: 'anyfunc'});
 284
 285 imports.env["abort"] = function () {
 286     console.error("ABORT");
 287 };
 288
 289 const wasmInstance = await WebAssembly.instantiate(wasmModule, imports)
 290 const wasm = wasmInstance.exports;
 291
 292
 293 // WASM CODEC
 294
 295 const nextMultipleOfFour = (value: number) => {
 296     return Math.ceil(value / 4) * 4;
 297 }
 298
 299 const encodeArray = (inputArray) => {
 300     // TODO: (matt) is this correct, or should it go back to length * 4?
 301     // const cArrayPointer = wasm.wasm_malloc(inputArray.length * 4);
 302     const cArrayPointer = wasm.wasm_malloc(nextMultipleOfFour(inputArray.length));
 303
 304     const arrayMemoryView = new Uint32Array(memory.buffer, cArrayPointer, inputArray.length);
 305     arrayMemoryView.set(inputArray);
 306     return cArrayPointer;
 307 }
 308
 309 const decodeArray = (arrayPointer, free = true) => {
 310     const arraySizeViewer = new Uint32Array(
 311         memory.buffer, // value
 312         arrayPointer, // offset
 313         1 // one int
 314     );
 315     const arraySize = arraySizeViewer[0];
 316     const actualArrayViewer = new Uint32Array(
 317         memory.buffer, // value
 318         arrayPointer, // offset
 319         arraySize + 1
 320     );
 321     const actualArray = actualArrayViewer.slice(1, arraySize + 1);
 322     if (free) {
 323         // wasm.free_array(arrayPointer);
 324         wasm.wasm_free(arrayPointer); // TODO: check if passing *void still captures remaining values
 325     }
 326     return actualArray;
 327 }
 328
 329 const encodeString = (string) => {
 330     // make malloc count divisible by 4
 331     const memoryNeed = nextMultipleOfFour(string.length + 1);
 332     const stringPointer = wasm.wasm_malloc(memoryNeed);
 333     const stringMemoryView = new Uint8Array(
 334         memory.buffer, // value
 335         stringPointer, // offset
 336         string.length + 1 // length
 337     );
 338     for (let i = 0; i < string.length; i++) {
 339         stringMemoryView[i] = string.charCodeAt(i);
 340     }
 341     stringMemoryView[string.length] = 0;
 342     return stringPointer;
 343 }
 344
 345 const decodeString = (stringPointer, free = true) => {
 346     const memoryView = new Uint8Array(memory.buffer, stringPointer);
 347     let cursor = 0;
 348     let result = '';
 349
 350     while (memoryView[cursor] !== 0) {
 351         result += String.fromCharCode(memoryView[cursor]);
 352         cursor++;
 353     }
 354
 355     if (free) {
 356         wasm.wasm_free(stringPointer);
 357     }
 358
 359     return result;
 360 };
 361
 362
 363             """
 364         return ''
 365
 366     def init_str(self, c_array_class_caches):
 367         return ""
 368
 369     def native_c_unitary_enum_map(self, struct_name, variants):
 370         out_c = "static inline " + struct_name + " " + struct_name + "_from_js(int32_t ord) {\n"
 371         out_c = out_c + "\tswitch (ord) {\n"
 372         ord_v = 0
 373
 374         out_typescript_enum_fields = ""
 375
 376         for var in variants:
 377             out_c = out_c + "\t\tcase %d: return %s;\n" % (ord_v, var)
 378             ord_v = ord_v + 1
 379             out_typescript_enum_fields += f"{var},\n\t\t\t\t"
 380         out_c = out_c + "\t}\n"
 381         out_c = out_c + "\tabort();\n"
 382         out_c = out_c + "}\n"
 383
 384         out_c = out_c + "static inline int32_t " + struct_name + "_to_js(" + struct_name + " val) {\n"
 385         out_c = out_c + "\tswitch (val) {\n"
 386         ord_v = 0
 387         for var in variants:
 388             out_c = out_c + "\t\tcase " + var + ": return %d;\n" % ord_v
 389             ord_v = ord_v + 1
 390         out_c = out_c + "\t\tdefault: abort();\n"
 391         out_c = out_c + "\t}\n"
 392         out_c = out_c + "}\n"
 393
 394         out_typescript_enum = f"""
 395             export enum {struct_name} {{
 396                 {out_typescript_enum_fields}
 397             }}
 398         """
 399
 400         return (out_c, out_typescript_enum, "")
 401
 402     def c_unitary_enum_to_native_call(self, ty_info):
 403         return (ty_info.rust_obj + "_to_js(", ")")
 404     def native_unitary_enum_to_c_call(self, ty_info):
 405         return (ty_info.rust_obj + "_from_js(", ")")
 406
 407     def c_complex_enum_pass_ty(self, struct_name):
 408         return "uint32_t"
 409
 410     def c_constr_native_complex_enum(self, struct_name, variant, c_params):
 411         ret = "0 /* " + struct_name + " - " + variant + " */"
 412         for param in c_params:
 413             ret = ret + "; (void) " + param
 414         return ret
 415
 416     def native_c_map_trait(self, struct_name, field_var_conversions, field_function_lines):
 417         out_typescript_bindings = "\n\n\n// OUT_TYPESCRIPT_BINDINGS :: MAP_TRAIT :: START\n\n"
 418
 419         constructor_arguments = ""
 420         super_instantiator = ""
 421         pointer_to_adder = ""
 422         impl_constructor_arguments = ""
 423         for var in field_var_conversions:
 424             if isinstance(var, ConvInfo):
 425                 constructor_arguments += f", {first_to_lower(var.arg_name)}?: {var.java_hu_ty}"
 426                 impl_constructor_arguments += f", {var.arg_name}: {var.java_hu_ty}"
 427                 if var.from_hu_conv is not None:
 428                     super_instantiator += ", " + var.from_hu_conv[0]
 429                     if var.from_hu_conv[1] != "":
 430                         pointer_to_adder += var.from_hu_conv[1] + ";\n"
 431                 else:
 432                     super_instantiator += ", " + first_to_lower(var.arg_name)
 433             else:
 434                 constructor_arguments += f", {first_to_lower(var[1])}?: bindings.{var[0]}"
 435                 super_instantiator += ", " + first_to_lower(var[1])
 436                 pointer_to_adder += "this.ptrs_to.push(" + first_to_lower(var[1]) + ");\n"
 437                 impl_constructor_arguments += f", {first_to_lower(var[1])}_impl: {var[0].replace('LDK', '')}.{var[0].replace('LDK', '')}Interface"
 438
 439         # BUILD INTERFACE METHODS
 440         out_java_interface = ""
 441         out_interface_implementation_overrides = ""
 442         java_methods = []
 443         for fn_line in field_function_lines:
 444             java_method_descriptor = ""
 445             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 446                 out_java_interface += fn_line.fn_name + "("
 447                 out_interface_implementation_overrides += f"{fn_line.fn_name} ("
 448
 449                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 450                     if idx >= 1:
 451                         out_java_interface += ", "
 452                         out_interface_implementation_overrides += ", "
 453                     out_java_interface += f"{arg_conv_info.arg_name}: {arg_conv_info.java_hu_ty}"
 454                     out_interface_implementation_overrides += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
 455                     java_method_descriptor += arg_conv_info.java_fn_ty_arg
 456                 out_java_interface += f"): {fn_line.ret_ty_info.java_hu_ty};\n\t\t\t\t"
 457                 java_method_descriptor += ")" + fn_line.ret_ty_info.java_fn_ty_arg
 458                 java_methods.append((fn_line.fn_name, java_method_descriptor))
 459
 460                 out_interface_implementation_overrides += f"): {fn_line.ret_ty_info.java_ty} {{\n"
 461
 462                 interface_method_override_inset = "\t\t\t\t\t\t"
 463                 interface_implementation_inset = "\t\t\t\t\t\t\t"
 464                 for arg_info in fn_line.args_ty:
 465                     if arg_info.to_hu_conv is not None:
 466                         out_interface_implementation_overrides += interface_implementation_inset + arg_info.to_hu_conv.replace("\n", "\n\t\t\t\t") + "\n"
 467
 468                 if fn_line.ret_ty_info.java_ty != "void":
 469                     out_interface_implementation_overrides += interface_implementation_inset + fn_line.ret_ty_info.java_hu_ty + " ret = arg." + fn_line.fn_name + "("
 470                 else:
 471                     out_interface_implementation_overrides += f"{interface_implementation_inset}arg." + fn_line.fn_name + "("
 472
 473                 for idx, arg_info in enumerate(fn_line.args_ty):
 474                     if idx != 0:
 475                         out_interface_implementation_overrides += ", "
 476                     if arg_info.to_hu_conv_name is not None:
 477                         out_interface_implementation_overrides += arg_info.to_hu_conv_name
 478                     else:
 479                         out_interface_implementation_overrides += arg_info.arg_name
 480
 481                 out_interface_implementation_overrides += ");\n"
 482                 if fn_line.ret_ty_info.java_ty != "void":
 483                     if fn_line.ret_ty_info.from_hu_conv is not None:
 484                         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"
 485                         if fn_line.ret_ty_info.from_hu_conv[1] != "":
 486                             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"
 487                         #if fn_line.ret_ty_info.rust_obj in result_types:
 488                         # XXX: We need to handle this in conversion logic so that its cross-language!
 489                         # Avoid double-free by breaking the result - we should learn to clone these and then we can be safe instead
 490                         #    out_interface_implementation_overrides = out_interface_implementation_overrides + "\t\t\t\tret.ptr = 0;\n"
 491                         out_interface_implementation_overrides = out_interface_implementation_overrides + "\t\t\t\treturn result;\n"
 492                     else:
 493                         out_interface_implementation_overrides = out_interface_implementation_overrides + "\t\t\t\treturn ret;\n"
 494                 out_interface_implementation_overrides += f"{interface_method_override_inset}}},\n\n{interface_method_override_inset}"
 495
 496         trait_constructor_arguments = ""
 497         for var in field_var_conversions:
 498             if isinstance(var, ConvInfo):
 499                 trait_constructor_arguments += ", " + var.arg_name
 500             else:
 501                 trait_constructor_arguments += ", " + var[1] + ".new_impl(" + var[1] + "_impl).bindings_instance"
 502
 503
 504
 505         out_typescript_human = f"""
 506             {self.hu_struct_file_prefix}
 507
 508             export class {struct_name.replace("LDK","")} extends CommonBase {{
 509
 510                 bindings_instance?: bindings.{struct_name};
 511
 512                 constructor(ptr?: number, arg?: bindings.{struct_name}{constructor_arguments}) {{
 513                     if (Number.isFinite(ptr)) {{
 514                                         super(ptr);
 515                                         this.bindings_instance = null;
 516                                     }} else {{
 517                                         // TODO: private constructor instantiation
 518                                         super(bindings.{struct_name}_new(arg{super_instantiator}));
 519                                         this.ptrs_to.push(arg);
 520                                         {pointer_to_adder}
 521                                     }}
 522                 }}
 523
 524                 protected finalize() {{
 525                     if (this.ptr != 0) {{
 526                         bindings.{struct_name.replace("LDK","")}_free(this.ptr);
 527                     }}
 528                     super.finalize();
 529                 }}
 530
 531                 static new_impl(arg: {struct_name.replace("LDK", "")}Interface{impl_constructor_arguments}): {struct_name.replace("LDK", "")} {{
 532                     const impl_holder: {struct_name}Holder = new {struct_name}Holder();
 533                     let structImplementation = <bindings.{struct_name}>{{
 534
 535                         // todo: in-line interface filling
 536
 537                         {out_interface_implementation_overrides}
 538                     }};
 539                     impl_holder.held = new {struct_name.replace("LDK", "")} (null, structImplementation{trait_constructor_arguments});
 540                 }}
 541
 542             }}
 543
 544             export interface {struct_name.replace("LDK", "")}Interface {{
 545                 {out_java_interface}
 546             }}
 547
 548             class {struct_name}Holder {{
 549                 held: {struct_name.replace("LDK", "")};
 550             }}
 551
 552         """
 553
 554
 555
 556         out_typescript_bindings += "\t\texport interface " + struct_name + " {\n"
 557         java_meths = []
 558         for fn_line in field_function_lines:
 559             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 560                 out_typescript_bindings += f"\t\t\t{fn_line.fn_name} ("
 561
 562                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 563                     if idx >= 1:
 564                         out_typescript_bindings = out_typescript_bindings + ", "
 565                     out_typescript_bindings += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
 566
 567                 out_typescript_bindings += f"): {fn_line.ret_ty_info.java_ty};\n"
 568
 569         out_typescript_bindings = out_typescript_bindings + "\t\t}\n\n"
 570
 571         out_typescript_bindings += f"\t\texport function {struct_name}_new(impl: {struct_name}"
 572         for var in field_var_conversions:
 573             if isinstance(var, ConvInfo):
 574                 out_typescript_bindings += f", {var.arg_name}: {var.java_ty}"
 575             else:
 576                 out_typescript_bindings += f", {var[1]}: {var[0]}"
 577
 578         out_typescript_bindings += f"""): number {{
 579             throw new Error('unimplemented'); // TODO: bind to WASM
 580         }}
 581
 582         export function {struct_name}_get_obj_from_jcalls(val: number): {struct_name} {{
 583             throw new Error('unimplemented'); // TODO: bind to WASM
 584         }}
 585         """
 586
 587         out_typescript_bindings += '\n// OUT_TYPESCRIPT_BINDINGS :: MAP_TRAIT :: END\n\n\n'
 588
 589         # Now that we've written out our java code (and created java_meths), generate C
 590         out_c = "typedef struct " + struct_name + "_JCalls {\n"
 591         out_c = out_c + "\tatomic_size_t refcnt;\n"
 592         out_c = out_c + "\tJavaVM *vm;\n"
 593         out_c = out_c + "\tjweak o;\n"
 594         for var in field_var_conversions:
 595             if isinstance(var, ConvInfo):
 596                 # We're a regular ol' field
 597                 pass
 598             else:
 599                 # We're a supertrait
 600                 out_c = out_c + "\t" + var[0] + "_JCalls* " + var[1] + ";\n"
 601         for fn in field_function_lines:
 602             if fn.fn_name != "free" and fn.fn_name != "clone":
 603                 out_c = out_c + "\tjmethodID " + fn.fn_name + "_meth;\n"
 604         out_c = out_c + "} " + struct_name + "_JCalls;\n"
 605
 606         for fn_line in field_function_lines:
 607             if fn_line.fn_name == "free":
 608                 out_c = out_c + "static void " + struct_name + "_JCalls_free(void* this_arg) {\n"
 609                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 610                 out_c = out_c + "\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n"
 611                 out_c = out_c + "\t\tJNIEnv *env;\n"
 612                 out_c = out_c + "\t\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_8) == JNI_OK);\n"
 613                 out_c = out_c + "\t\t(*env)->DeleteWeakGlobalRef(env, j_calls->o);\n"
 614                 out_c = out_c + "\t\tFREE(j_calls);\n"
 615                 out_c = out_c + "\t}\n}\n"
 616
 617         for idx, fn_line in enumerate(field_function_lines):
 618             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 619                 assert fn_line.ret_ty_info.ty_info.get_full_rust_ty()[1] == ""
 620                 out_c = out_c + fn_line.ret_ty_info.ty_info.get_full_rust_ty()[0] + " " + fn_line.fn_name + "_jcall("
 621                 if fn_line.self_is_const:
 622                     out_c = out_c + "const void* this_arg"
 623                 else:
 624                     out_c = out_c + "void* this_arg"
 625
 626                 for idx, arg in enumerate(fn_line.args_ty):
 627                     out_c = out_c + ", " + arg.ty_info.get_full_rust_ty()[0] + " " + arg.arg_name + arg.ty_info.get_full_rust_ty()[1]
 628
 629                 out_c = out_c + ") {\n"
 630                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 631                 out_c = out_c + "\tJNIEnv *env;\n"
 632                 out_c = out_c + "\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_8) == JNI_OK);\n"
 633
 634                 for arg_info in fn_line.args_ty:
 635                     if arg_info.ret_conv is not None:
 636                         out_c = out_c + "\t" + arg_info.ret_conv[0].replace('\n', '\n\t')
 637                         out_c = out_c + arg_info.arg_name
 638                         out_c = out_c + arg_info.ret_conv[1].replace('\n', '\n\t') + "\n"
 639
 640                 out_c = out_c + "\tjobject obj = (*env)->NewLocalRef(env, j_calls->o);\n\tCHECK(obj != NULL);\n"
 641                 if fn_line.ret_ty_info.c_ty.endswith("Array"):
 642                     out_c = out_c + "\t" + fn_line.ret_ty_info.c_ty + " arg = (*env)->CallObjectMethod(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 643                 elif not fn_line.ret_ty_info.passed_as_ptr:
 644                     out_c = out_c + "\treturn (*env)->Call" + fn_line.ret_ty_info.java_ty.title() + "Method(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 645                 else:
 646                     out_c = out_c + "\t" + fn_line.ret_ty_info.rust_obj + "* ret = (" + fn_line.ret_ty_info.rust_obj + "*)(*env)->CallLongMethod(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 647
 648                 for idx, arg_info in enumerate(fn_line.args_ty):
 649                     if arg_info.ret_conv is not None:
 650                         out_c = out_c + ", " + arg_info.ret_conv_name
 651                     else:
 652                         out_c = out_c + ", " + arg_info.arg_name
 653                 out_c = out_c + ");\n"
 654                 if fn_line.ret_ty_info.arg_conv is not None:
 655                     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"
 656
 657                 out_c = out_c + "}\n"
 658
 659         # Write out a clone function whether we need one or not, as we use them in moving to rust
 660         out_c = out_c + "static void* " + struct_name + "_JCalls_clone(const void* this_arg) {\n"
 661         out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 662         out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n"
 663         for var in field_var_conversions:
 664             if not isinstance(var, ConvInfo):
 665                 out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->" + var[1] + "->refcnt, 1, memory_order_release);\n"
 666         out_c = out_c + "\treturn (void*) this_arg;\n"
 667         out_c = out_c + "}\n"
 668
 669         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_init (" + self.c_fn_args_pfx + ", jobject o"
 670         for var in field_var_conversions:
 671             if isinstance(var, ConvInfo):
 672                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 673             else:
 674                 out_c = out_c + ", jobject " + var[1]
 675         out_c = out_c + ") {\n"
 676
 677         out_c = out_c + "\tjclass c = (*env)->GetObjectClass(env, o);\n"
 678         out_c = out_c + "\tCHECK(c != NULL);\n"
 679         out_c = out_c + "\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n"
 680         out_c = out_c + "\tatomic_init(&calls->refcnt, 1);\n"
 681         out_c = out_c + "\tDO_ASSERT((*env)->GetJavaVM(env, &calls->vm) == 0);\n"
 682         out_c = out_c + "\tcalls->o = (*env)->NewWeakGlobalRef(env, o);\n"
 683
 684         for (fn_name, java_meth_descr) in java_meths:
 685             if fn_name != "free" and fn_name != "clone":
 686                 out_c = out_c + "\tcalls->" + fn_name + "_meth = (*env)->GetMethodID(env, c, \"" + fn_name + "\", \"" + java_meth_descr + "\");\n"
 687                 out_c = out_c + "\tCHECK(calls->" + fn_name + "_meth != NULL);\n"
 688
 689         for var in field_var_conversions:
 690             if isinstance(var, ConvInfo) and var.arg_conv is not None:
 691                 out_c = out_c + "\n\t" + var.arg_conv.replace("\n", "\n\t") +"\n"
 692         out_c = out_c + "\n\t" + struct_name + " ret = {\n"
 693         out_c = out_c + "\t\t.this_arg = (void*) calls,\n"
 694         for fn_line in field_function_lines:
 695             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 696                 out_c = out_c + "\t\t." + fn_line.fn_name + " = " + fn_line.fn_name + "_jcall,\n"
 697             elif fn_line.fn_name == "free":
 698                 out_c = out_c + "\t\t.free = " + struct_name + "_JCalls_free,\n"
 699             else:
 700                 out_c = out_c + "\t\t.clone = " + struct_name + "_JCalls_clone,\n"
 701         for var in field_var_conversions:
 702             if isinstance(var, ConvInfo):
 703                 if var.arg_conv_name is not None:
 704                     out_c = out_c + "\t\t." + var.arg_name + " = " + var.arg_conv_name + ",\n"
 705                     out_c = out_c + "\t\t.set_" + var.arg_name + " = NULL,\n"
 706                 else:
 707                     out_c = out_c + "\t\t." + var.var_name + " = " + var.var_name + ",\n"
 708                     out_c = out_c + "\t\t.set_" + var.var_name + " = NULL,\n"
 709             else:
 710                 out_c = out_c + "\t\t." + var[1] + " = " + var[0] + "_init(env, clz, " + var[1] + "),\n"
 711         out_c = out_c + "\t};\n"
 712         for var in field_var_conversions:
 713             if not isinstance(var, ConvInfo):
 714                 out_c = out_c + "\tcalls->" + var[1] + " = ret." + var[1] + ".this_arg;\n"
 715         out_c = out_c + "\treturn ret;\n"
 716         out_c = out_c + "}\n"
 717
 718         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 + ", jobject o"
 719         for var in field_var_conversions:
 720             if isinstance(var, ConvInfo):
 721                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 722             else:
 723                 out_c = out_c + ", jobject " + var[1]
 724         out_c = out_c + ") {\n"
 725         out_c = out_c + "\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n"
 726         out_c = out_c + "\t*res_ptr = " + struct_name + "_init(env, clz, o"
 727         for var in field_var_conversions:
 728             if isinstance(var, ConvInfo):
 729                 out_c = out_c + ", " + var.arg_name
 730             else:
 731                 out_c = out_c + ", " + var[1]
 732         out_c = out_c + ");\n"
 733         out_c = out_c + "\treturn (long)res_ptr;\n"
 734         out_c = out_c + "}\n"
 735
 736         out_c = out_c + self.c_fn_ty_pfx + "jobject " + self.c_fn_name_pfx + struct_name.replace("_", "_1") + "_1get_1obj_1from_1jcalls (" + self.c_fn_args_pfx + ", " + self.ptr_c_ty + " val) {\n"
 737         out_c = out_c + "\tjobject ret = (*env)->NewLocalRef(env, ((" + struct_name + "_JCalls*)val)->o);\n"
 738         out_c = out_c + "\tCHECK(ret != NULL);\n"
 739         out_c = out_c + "\treturn ret;\n"
 740         out_c = out_c + "}\n"
 741
 742
 743         return (out_typescript_bindings, out_typescript_human, out_c)
 744
 745     def map_complex_enum(self, struct_name, variant_list, camel_to_snake):
 746         java_hu_type = struct_name.replace("LDK", "")
 747
 748         out_java_enum = ""
 749         out_java = ""
 750         out_c = ""
 751
 752         out_java_enum += (self.hu_struct_file_prefix)
 753         out_java_enum += ("export default class " + java_hu_type + " extends CommonBase {\n")
 754         out_java_enum += ("\tprotected constructor(_dummy: object, ptr: number) { super(ptr); }\n")
 755         out_java_enum += ("\tprotected finalize() {\n")
 756         out_java_enum += ("\t\tsuper.finalize();\n")
 757         out_java_enum += ("\t\tif (this.ptr != 0) { bindings." + java_hu_type + "_free(this.ptr); }\n")
 758         out_java_enum += ("\t}\n")
 759         out_java_enum += f"\tstatic constr_from_ptr(ptr: number): {java_hu_type} {{\n"
 760         out_java_enum += (f"\t\tconst raw_val: bindings.{struct_name} = bindings." + struct_name + "_ref_from_ptr(ptr);\n")
 761         java_hu_subclasses = ""
 762
 763         out_java +=  ("\tpublic static class " + struct_name + " {\n")
 764         out_java +=  ("\t\tprivate " + struct_name + "() {}\n")
 765         for var in variant_list:
 766             out_java +=  ("\t\texport class " + var.var_name + " extends " + struct_name + " {\n")
 767             java_hu_subclasses = java_hu_subclasses + "export class " + var.var_name + " extends " + java_hu_type + " {\n"
 768             out_java_enum += ("\t\tif (raw_val instanceof bindings." + struct_name + "." + var.var_name + ") {\n")
 769             out_java_enum += ("\t\t\treturn new " + var.var_name + "(this.ptr, raw_val);\n")
 770             init_meth_params = ""
 771             init_meth_body = ""
 772             hu_conv_body = ""
 773             for idx, field_ty in enumerate(var.fields):
 774                 out_java += ("\t\t\tpublic " + field_ty.java_ty + " " + field_ty.arg_name + ";\n")
 775                 java_hu_subclasses = java_hu_subclasses + "\tpublic " + field_ty.arg_name + f": {field_ty.java_hu_ty};\n"
 776                 if field_ty.to_hu_conv is not None:
 777                     hu_conv_body = hu_conv_body + "\t\tconst " + field_ty.arg_name + f": {field_ty.java_ty} = obj." + field_ty.arg_name + ";\n"
 778                     hu_conv_body = hu_conv_body + "\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
 779                     hu_conv_body = hu_conv_body + "\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
 780                 else:
 781                     hu_conv_body = hu_conv_body + "\t\tthis." + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
 782                 if idx > 0:
 783                     init_meth_params = init_meth_params + ", "
 784                 init_meth_params = init_meth_params + field_ty.java_ty + " " + field_ty.arg_name
 785                 init_meth_body = init_meth_body + "this." + field_ty.arg_name + " = " + field_ty.arg_name + "; "
 786             out_java +=  ("\t\t\t" + var.var_name + "(" + init_meth_params + ") { ")
 787             out_java +=  (init_meth_body)
 788             out_java +=  ("}\n")
 789             out_java += ("\t\t}\n")
 790             out_java_enum += ("\t\t}\n")
 791             java_hu_subclasses = java_hu_subclasses + "\tprivate constructor(ptr: number, obj: bindings." + struct_name + "." + var.var_name + ") {\n\t\tsuper(null, ptr);\n"
 792             java_hu_subclasses = java_hu_subclasses + hu_conv_body
 793             java_hu_subclasses = java_hu_subclasses + "\t}\n}\n"
 794         out_java += ("\t\tstatic native void init();\n")
 795         out_java += ("\t}\n")
 796         out_java_enum += ("\t\tthrow new Error('oops, this should be unreachable'); // Unreachable without extending the (internal) bindings interface\n\t}\n\n")
 797         out_java += ("\tstatic { " + struct_name + ".init(); }\n")
 798         out_java += ("\tpublic static native " + struct_name + " " + struct_name + "_ref_from_ptr(long ptr);\n");
 799
 800         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")
 801         out_c += ("\t" + struct_name + " *obj = (" + struct_name + "*)ptr;\n")
 802         out_c += ("\tswitch(obj->tag) {\n")
 803         for var in variant_list:
 804             out_c += ("\t\tcase " + struct_name + "_" + var.var_name + ": {\n")
 805             c_params = []
 806             for idx, field_map in enumerate(var.fields):
 807                 if field_map.ret_conv is not None:
 808                     out_c += ("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
 809                     out_c += ("obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name)
 810                     out_c += (field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
 811                     c_params.append(field_map.ret_conv_name)
 812                 else:
 813                     c_params.append("obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name)
 814             out_c += ("\t\t\treturn " + self.c_constr_native_complex_enum(struct_name, var.var_name, c_params) + ";\n")
 815             out_c += ("\t\t}\n")
 816         out_c += ("\t\tdefault: abort();\n")
 817         out_c += ("\t}\n}\n")
 818         out_java_enum += ("}\n")
 819         out_java_enum += (java_hu_subclasses)
 820         return (out_java, out_java_enum, out_c)
 821
 822     def map_opaque_struct(self, struct_name):
 823
 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         needs_decoding = return_type_info.c_ty in self.wasm_decoding_map
 886         return_value = 'nativeResponseValue'
 887         if needs_decoding:
 888             converter = self.wasm_decoding_map[return_type_info.c_ty]
 889             return_value = f"{converter}(nativeResponseValue)"
 890
 891         out_java = f"""\texport function {method_name}({method_argument_string}): {return_type_info.java_ty} {{
 892             const nativeResponseValue = wasm.{method_name}({native_call_argument_string});
 893             return {return_value};
 894         \n\t}}
 895         \n"""
 896
 897
 898
 899         if has_out_java_struct:
 900             out_java_struct = ""
 901             if not args_known:
 902                 out_java_struct += ("\t// Skipped " + method_name + "\n")
 903                 has_out_java_struct = False
 904             else:
 905                 meth_n = method_name[len(struct_meth) + 1:]
 906                 if not takes_self:
 907                     out_java_struct += (
 908                             "\tpublic static " + return_type_info.java_hu_ty + " constructor_" + meth_n + "(")
 909                 else:
 910                     out_java_struct += ("\tpublic " + return_type_info.java_hu_ty + " " + meth_n + "(")
 911                 for idx, arg in enumerate(argument_types):
 912                     if idx != 0:
 913                         if not takes_self or idx > 1:
 914                             out_java_struct += (", ")
 915                     elif takes_self:
 916                         continue
 917                     if arg.java_ty != "void":
 918                         if arg.arg_name in default_constructor_args:
 919                             for explode_idx, explode_arg in enumerate(default_constructor_args[arg.arg_name]):
 920                                 if explode_idx != 0:
 921                                     out_java_struct += (", ")
 922                                 out_java_struct += (
 923                                         explode_arg.java_hu_ty + " " + arg.arg_name + "_" + explode_arg.arg_name)
 924                         else:
 925                             out_java_struct += (arg.java_hu_ty + " " + arg.arg_name)
 926
 927         out_c += (") {\n")
 928         if out_java_struct is not None:
 929             out_java_struct += (") {\n")
 930         for info in argument_types:
 931             if info.arg_conv is not None:
 932                 out_c += ("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
 933         if return_type_info.ret_conv is not None:
 934             out_c += ("\t" + ret_conv_pfx.replace('\n', '\n\t'))
 935         elif return_type_info.c_ty != "void":
 936             out_c += ("\t" + return_type_info.c_ty + " ret_val = ")
 937         else:
 938             out_c += ("\t")
 939         if c_call_string is None:
 940             out_c += (method_name + "(")
 941         else:
 942             out_c += (c_call_string)
 943         for idx, info in enumerate(argument_types):
 944             if info.arg_conv_name is not None:
 945                 if idx != 0:
 946                     out_c += (", ")
 947                 elif c_call_string is not None:
 948                     continue
 949                 out_c += (info.arg_conv_name)
 950         out_c += (")")
 951         if return_type_info.ret_conv is not None:
 952             out_c += (ret_conv_sfx.replace('\n', '\n\t'))
 953         else:
 954             out_c += (";")
 955         for info in argument_types:
 956             if info.arg_conv_cleanup is not None:
 957                 out_c += ("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
 958         if return_type_info.ret_conv is not None:
 959             out_c += ("\n\treturn " + return_type_info.ret_conv_name + ";")
 960         elif return_type_info.c_ty != "void":
 961             out_c += ("\n\treturn ret_val;")
 962         out_c += ("\n}\n\n")
 963
 964         if has_out_java_struct:
 965             out_java_struct += ("\t\t")
 966             if return_type_info.java_ty != "void":
 967                 out_java_struct += (return_type_info.java_ty + " ret = ")
 968             out_java_struct += ("bindings." + method_name + "(")
 969             for idx, info in enumerate(argument_types):
 970                 if idx != 0:
 971                     out_java_struct += (", ")
 972                 if idx == 0 and takes_self:
 973                     out_java_struct += ("this.ptr")
 974                 elif info.arg_name in default_constructor_args:
 975                     out_java_struct += ("bindings." + info.java_hu_ty + "_new(")
 976                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
 977                         if explode_idx != 0:
 978                             out_java_struct += (", ")
 979                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
 980                         if explode_arg.from_hu_conv is not None:
 981                             out_java_struct += (
 982                                 explode_arg.from_hu_conv[0].replace(explode_arg.arg_name, expl_arg_name))
 983                         else:
 984                             out_java_struct += (expl_arg_name)
 985                     out_java_struct += (")")
 986                 elif info.from_hu_conv is not None:
 987                     out_java_struct += (info.from_hu_conv[0])
 988                 else:
 989                     out_java_struct += (info.arg_name)
 990             out_java_struct += (");\n")
 991             if return_type_info.to_hu_conv is not None:
 992                 if not takes_self:
 993                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t").replace("this",
 994                                                                                                              return_type_info.to_hu_conv_name) + "\n")
 995                 else:
 996                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t") + "\n")
 997
 998             for idx, info in enumerate(argument_types):
 999                 if idx == 0 and takes_self:
1000                     pass
1001                 elif info.arg_name in default_constructor_args:
1002                     for explode_arg in default_constructor_args[info.arg_name]:
1003                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1004                         if explode_arg.from_hu_conv is not None and return_type_info.to_hu_conv_name:
1005                             out_java_struct += ("\t\t" + explode_arg.from_hu_conv[1].replace(explode_arg.arg_name,
1006                                                                                              expl_arg_name).replace(
1007                                 "this", return_type_info.to_hu_conv_name) + ";\n")
1008                 elif info.from_hu_conv is not None and info.from_hu_conv[1] != "":
1009                     if not takes_self and return_type_info.to_hu_conv_name is not None:
1010                         out_java_struct += (
1011                                 "\t\t" + info.from_hu_conv[1].replace("this", return_type_info.to_hu_conv_name) + ";\n")
1012                     else:
1013                         out_java_struct += ("\t\t" + info.from_hu_conv[1] + ";\n")
1014
1015             if return_type_info.to_hu_conv_name is not None:
1016                 out_java_struct += ("\t\treturn " + return_type_info.to_hu_conv_name + ";\n")
1017             elif return_type_info.java_ty != "void" and return_type_info.rust_obj != "LDK" + struct_meth:
1018                 out_java_struct += ("\t\treturn ret;\n")
1019             out_java_struct += ("\t}\n\n")
1020
1021         return (out_java, out_c, out_java_struct)