_ Git - ldk-java/blob - typescript_strings.py

   1 from bindingstypes import ConvInfo
   2 from enum import Enum
   3
   4 def first_to_lower(string: str) -> str:
   5     first = string[0]
   6     return first.lower() + string[1:]
   7
   8
   9 class Target(Enum):
  10     NODEJS = 1,
  11     BROWSER = 2
  12
  13 class Consts:
  14     def __init__(self, DEBUG: bool, target: Target, **kwargs):
  15
  16         self.c_type_map = dict(
  17             uint8_t = ['number', 'Uint8Array'],
  18             uint16_t = ['number', 'Uint16Array'],
  19             uint32_t = ['number', 'Uint32Array'],
  20             uint64_t = ['number'],
  21         )
  22
  23         self.wasm_decoding_map = dict(
  24             int8_tArray = 'decodeArray'
  25         )
  26
  27         self.wasm_encoding_map = dict(
  28             int8_tArray = 'encodeArray',
  29         )
  30
  31         self.to_hu_conv_templates = dict(
  32             ptr = 'const {var_name}_hu_conv: {human_type} = new {human_type}(null, {var_name});',
  33             default = 'const {var_name}_hu_conv: {human_type} = new {human_type}(null, {var_name});',
  34         )
  35
  36         self.bindings_header = self.wasm_import_header(target) + """
  37 export class VecOrSliceDef {
  38     public dataptr: number;
  39     public datalen: number;
  40     public stride: number;
  41     public constructor(dataptr: number, datalen: number, stride: number) {
  42         this.dataptr = dataptr;
  43         this.datalen = datalen;
  44         this.stride = stride;
  45     }
  46 }
  47
  48 /*
  49 TODO: load WASM file
  50 static {
  51     System.loadLibrary(\"lightningjni\");
  52     init(java.lang.Enum.class, VecOrSliceDef.class);
  53     init_class_cache();
  54 }
  55
  56 static native void init(java.lang.Class c, java.lang.Class slicedef);
  57 static native void init_class_cache();
  58
  59 public static native boolean deref_bool(long ptr);
  60 public static native long deref_long(long ptr);
  61 public static native void free_heap_ptr(long ptr);
  62 public static native byte[] read_bytes(long ptr, long len);
  63 public static native byte[] get_u8_slice_bytes(long slice_ptr);
  64 public static native long bytes_to_u8_vec(byte[] bytes);
  65 public static native long new_txpointer_copy_data(byte[] txdata);
  66 public static native void txpointer_free(long ptr);
  67 public static native byte[] txpointer_get_buffer(long ptr);
  68 public static native long vec_slice_len(long vec);
  69 public static native long new_empty_slice_vec();
  70 */
  71
  72 """
  73
  74         self.bindings_footer = """
  75         export async function initializeWasm(allowDoubleInitialization: boolean = false): Promise<void> {
  76             if(isWasmInitialized && !allowDoubleInitialization) {
  77                 return;
  78             }
  79             const wasmInstance = await WebAssembly.instantiate(wasmModule, imports)
  80             wasm = wasmInstance.exports;
  81             isWasmInitialized = true;
  82         }
  83         """
  84
  85         self.common_base = """
  86             export default class CommonBase {
  87                 ptr: number;
  88                 ptrs_to: object[] = []; // new LinkedList(); TODO: build linked list implementation
  89                 protected constructor(ptr: number) { this.ptr = ptr; }
  90                 public _test_only_get_ptr(): number { return this.ptr; }
  91                 protected finalize() {
  92                     // TODO: finalize myself
  93                 }
  94             }
  95 """
  96
  97         self.c_file_pfx = """#include <rust_types.h>
  98 #include "js-wasm.h"
  99 #include <stdatomic.h>
 100 #include <lightning.h>
 101
 102 // These should be provided...somehow...
 103 void *memset(void *s, int c, size_t n);
 104 void *memcpy(void *dest, const void *src, size_t n);
 105 int memcmp(const void *s1, const void *s2, size_t n);
 106
 107 void __attribute__((noreturn)) abort(void);
 108 void assert(bool expression);
 109 """
 110
 111         if not DEBUG:
 112             self.c_file_pfx = self.c_file_pfx + """
 113 void *malloc(size_t size);
 114 void free(void *ptr);
 115
 116 #define MALLOC(a, _) malloc(a)
 117 #define FREE(p) if ((long)(p) > 1024) { free(p); }
 118 #define DO_ASSERT(a) (void)(a)
 119 #define CHECK(a)
 120 """
 121         else:
 122             self.c_file_pfx = self.c_file_pfx + """
 123 // Always run a, then assert it is true:
 124 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
 125 // Assert a is true or do nothing
 126 #define CHECK(a) DO_ASSERT(a)
 127
 128 // Running a leak check across all the allocations and frees of the JDK is a mess,
 129 // so instead we implement our own naive leak checker here, relying on the -wrap
 130 // linker option to wrap malloc/calloc/realloc/free, tracking everyhing allocated
 131 // and free'd in Rust or C across the generated bindings shared library.
 132
 133 #define BT_MAX 128
 134 typedef struct allocation {
 135         struct allocation* next;
 136         void* ptr;
 137         const char* struct_name;
 138 } allocation;
 139 static allocation* allocation_ll = NULL;
 140
 141 void* __real_malloc(size_t len);
 142 void* __real_calloc(size_t nmemb, size_t len);
 143 static void new_allocation(void* res, const char* struct_name) {
 144         allocation* new_alloc = __real_malloc(sizeof(allocation));
 145         new_alloc->ptr = res;
 146         new_alloc->struct_name = struct_name;
 147         new_alloc->next = allocation_ll;
 148         allocation_ll = new_alloc;
 149 }
 150 static void* MALLOC(size_t len, const char* struct_name) {
 151         void* res = __real_malloc(len);
 152         new_allocation(res, struct_name);
 153         return res;
 154 }
 155 void __real_free(void* ptr);
 156 static void alloc_freed(void* ptr) {
 157         allocation* p = NULL;
 158         allocation* it = allocation_ll;
 159         while (it->ptr != ptr) {
 160                 p = it; it = it->next;
 161                 if (it == NULL) {
 162                         //XXX: fprintf(stderr, "Tried to free unknown pointer %p\\n", ptr);
 163                         return; // addrsan should catch malloc-unknown and print more info than we have
 164                 }
 165         }
 166         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
 167         DO_ASSERT(it->ptr == ptr);
 168         __real_free(it);
 169 }
 170 static void FREE(void* ptr) {
 171         if ((long)ptr < 1024) return; // Rust loves to create pointers to the NULL page for dummys
 172         alloc_freed(ptr);
 173         __real_free(ptr);
 174 }
 175
 176 void* __wrap_malloc(size_t len) {
 177         void* res = __real_malloc(len);
 178         new_allocation(res, "malloc call");
 179         return res;
 180 }
 181 void* __wrap_calloc(size_t nmemb, size_t len) {
 182         void* res = __real_calloc(nmemb, len);
 183         new_allocation(res, "calloc call");
 184         return res;
 185 }
 186 void __wrap_free(void* ptr) {
 187         if (ptr == NULL) return;
 188         alloc_freed(ptr);
 189         __real_free(ptr);
 190 }
 191
 192 void* __real_realloc(void* ptr, size_t newlen);
 193 void* __wrap_realloc(void* ptr, size_t len) {
 194         if (ptr != NULL) alloc_freed(ptr);
 195         void* res = __real_realloc(ptr, len);
 196         new_allocation(res, "realloc call");
 197         return res;
 198 }
 199 void __wrap_reallocarray(void* ptr, size_t new_sz) {
 200         // Rust doesn't seem to use reallocarray currently
 201         DO_ASSERT(false);
 202 }
 203
 204 void __attribute__((destructor)) check_leaks() {
 205         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 206                 //XXX: fprintf(stderr, "%s %p remains\\n", a->struct_name, a->ptr);
 207         }
 208         DO_ASSERT(allocation_ll == NULL);
 209 }
 210 """
 211         self.c_file_pfx = self.c_file_pfx + """
 212 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
 213 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
 214 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
 215 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
 216
 217 _Static_assert(sizeof(void*) == 4, "Pointers mut be 32 bits");
 218
 219 //typedef struct int64_tArray { uint32_t *len; /* len + 1 is data */ } int64_tArray;
 220 //typedef struct uint32_tArray { uint32_t *len; /* len + 1 is data */ } uint32_tArray;
 221 //typedef struct ptrArray { uint32_t *len; /* len + 1 is data */ } ptrArray;
 222 //typedef struct int8_tArray { uint32_t *len; /* len + 1 is data */ } int8_tArray;
 223 typedef uint32_t int64_tArray;
 224 typedef uint32_t int8_tArray;
 225 typedef uint32_t uint32_tArray;
 226 typedef uint32_t ptrArray;
 227 typedef uint32_t jstring;
 228
 229 static inline uint32_t init_arr(size_t arr_len, size_t elem_size, const char *type_desc) {
 230         uint32_t *elems = (uint32_t*)MALLOC(arr_len * elem_size + 4, type_desc);
 231         elems[0] = arr_len;
 232         return (uint32_t)elems;
 233 }
 234
 235 jstring str_ref_to_ts(const char* chars, size_t len) {
 236         char* err_buf = MALLOC(len + 4, "str conv buf");
 237         *((uint32_t*)err_buf) = len;
 238         memcpy(err_buf + 4, chars, len);
 239         return (uint32_t) err_buf;
 240 }
 241
 242 typedef bool jboolean;
 243
 244 """
 245
 246         self.hu_struct_file_prefix = f"""
 247 import CommonBase from './CommonBase';
 248 import * as bindings from '../bindings' // TODO: figure out location
 249
 250 """
 251         self.c_fn_ty_pfx = ""
 252         self.c_fn_name_pfx = ""
 253         self.c_fn_args_pfx = "void* ctx_TODO"
 254         self.file_ext = ".ts"
 255         self.ptr_c_ty = "uint32_t"
 256         self.ptr_native_ty = "number"
 257         self.result_c_ty = "uint32_t"
 258         self.ptr_arr = "ptrArray"
 259         self.get_native_arr_len_call = ("*((uint32_t*)", ")")
 260
 261     def release_native_arr_ptr_call(self, ty_info, arr_var, arr_ptr_var):
 262         return None
 263     def create_native_arr_call(self, arr_len, ty_info):
 264         if ty_info.c_ty == "int8_tArray":
 265             return "init_arr(" + arr_len + ", sizeof(uint8_t), \"Native int8_tArray Bytes\")"
 266         elif ty_info.c_ty == "int64_tArray":
 267             return "init_arr(" + arr_len + ", sizeof(uint64_t), \"Native int64_tArray Bytes\")"
 268         elif ty_info.c_ty == "uint32_tArray":
 269             return "init_arr(" + arr_len + ", sizeof(uint32_t), \"Native uint32_tArray Bytes\")"
 270         elif ty_info.c_ty == "ptrArray":
 271             assert ty_info.subty is not None and ty_info.subty.c_ty.endswith("Array")
 272             return "init_arr(" + arr_len + ", sizeof(uint32_t), \"Native ptrArray Bytes\")"
 273         else:
 274             print("Need to create arr!", ty_info.c_ty)
 275             return ty_info.c_ty
 276     def set_native_arr_contents(self, arr_name, arr_len, ty_info):
 277         if ty_info.c_ty == "int8_tArray":
 278             return ("memcpy((uint8_t*)(" + arr_name + " + 4), ", ", " + arr_len + ")")
 279         else:
 280             assert False
 281     def get_native_arr_contents(self, arr_name, dest_name, arr_len, ty_info, copy):
 282         if ty_info.c_ty == "int8_tArray":
 283             if copy:
 284                 return "memcpy(" + dest_name + ", (uint8_t*)(" + arr_name + " + 4), " + arr_len + ")"
 285             else:
 286                 return "(int8_t*)(" + arr_name + " + 4)"
 287         else:
 288             return "(" + ty_info.subty.c_ty + "*)(" + arr_name + " + 4)"
 289     def get_native_arr_elem(self, arr_name, idxc, ty_info):
 290         assert False # Only called if above is None
 291     def get_native_arr_ptr_call(self, ty_info):
 292         if ty_info.subty is not None:
 293             return "(" + ty_info.subty.c_ty + "*)(", " + 4)"
 294         return "(" + ty_info.c_ty + "*)(", " + 4)"
 295     def get_native_arr_entry_call(self, ty_info, arr_name, idxc, entry_access):
 296         return None
 297     def cleanup_native_arr_ref_contents(self, arr_name, dest_name, arr_len, ty_info):
 298         if ty_info.c_ty == "int8_tArray":
 299             return None
 300         else:
 301             return None
 302
 303     def str_ref_to_c_call(self, var_name, str_len):
 304         return "str_ref_to_ts(" + var_name + ", " + str_len + ")"
 305
 306     def wasm_import_header(self, target):
 307         if target == Target.NODEJS:
 308             return """
 309 import * as fs from 'fs';
 310 const source = fs.readFileSync('./ldk.wasm');
 311
 312 const memory = new WebAssembly.Memory({initial: 256});
 313 const wasmModule = new WebAssembly.Module(source);
 314
 315 const imports: any = {};
 316 imports.env = {};
 317
 318 imports.env.memoryBase = 0;
 319 imports.env.memory = memory;
 320 imports.env.tableBase = 0;
 321 imports.env.table = new WebAssembly.Table({initial: 4, element: 'anyfunc'});
 322
 323 imports.env["abort"] = function () {
 324     console.error("ABORT");
 325 };
 326
 327 let wasm = null;
 328 let isWasmInitialized: boolean = false;
 329
 330
 331 // WASM CODEC
 332
 333 const nextMultipleOfFour = (value: number) => {
 334     return Math.ceil(value / 4) * 4;
 335 }
 336
 337 const encodeArray = (inputArray) => {
 338         const cArrayPointer = wasm.wasm_malloc((inputArray.length + 1) * 4);
 339         const arrayMemoryView = new Uint32Array(memory.buffer, cArrayPointer + 4, inputArray.length);
 340         arrayMemoryView.set(inputArray, 1);
 341     arrayMemoryView[0] = inputArray.length;
 342         return cArrayPointer;
 343 }
 344
 345 const getArrayLength = (arrayPointer) => {
 346         const arraySizeViewer = new Uint32Array(
 347                 memory.buffer, // value
 348                 arrayPointer, // offset
 349                 1 // one int
 350         );
 351         return arraySizeViewer[0];
 352 }
 353 const decodeUint8Array = (arrayPointer, free = true) => {
 354         const arraySize = getArrayLength(arrayPointer);
 355         const actualArrayViewer = new Uint8Array(
 356                 memory.buffer, // value
 357                 arrayPointer + 4, // offset (ignoring length bytes)
 358                 arraySize // uint8 count
 359         );
 360         // Clone the contents, TODO: In the future we should wrap the Viewer in a class that
 361         // will free the underlying memory when it becomes unreachable instead of copying here.
 362         const actualArray = actualArrayViewer.slice(0, arraySize);
 363         if (free) {
 364                 wasm.free(arrayPointer);
 365         }
 366         return actualArray;
 367 }
 368 const decodeUint32Array = (arrayPointer, free = true) => {
 369         const arraySize = getArrayLength(arrayPointer);
 370         const actualArrayViewer = new Uint32Array(
 371                 memory.buffer, // value
 372                 arrayPointer + 4, // offset (ignoring length bytes)
 373                 arraySize // uint32 count
 374         );
 375         // Clone the contents, TODO: In the future we should wrap the Viewer in a class that
 376         // will free the underlying memory when it becomes unreachable instead of copying here.
 377         const actualArray = actualArrayViewer.slice(0, arraySize);
 378         if (free) {
 379                 wasm.free(arrayPointer);
 380         }
 381         return actualArray;
 382 }
 383
 384 const encodeString = (string) => {
 385     // make malloc count divisible by 4
 386     const memoryNeed = nextMultipleOfFour(string.length + 1);
 387     const stringPointer = wasm.wasm_malloc(memoryNeed);
 388     const stringMemoryView = new Uint8Array(
 389         memory.buffer, // value
 390         stringPointer, // offset
 391         string.length + 1 // length
 392     );
 393     for (let i = 0; i < string.length; i++) {
 394         stringMemoryView[i] = string.charCodeAt(i);
 395     }
 396     stringMemoryView[string.length] = 0;
 397     return stringPointer;
 398 }
 399
 400 const decodeString = (stringPointer, free = true) => {
 401     const memoryView = new Uint8Array(memory.buffer, stringPointer);
 402     let cursor = 0;
 403     let result = '';
 404
 405     while (memoryView[cursor] !== 0) {
 406         result += String.fromCharCode(memoryView[cursor]);
 407         cursor++;
 408     }
 409
 410     if (free) {
 411         wasm.wasm_free(stringPointer);
 412     }
 413
 414     return result;
 415 };
 416 """
 417         return ''
 418
 419     def init_str(self):
 420         return ""
 421
 422     def native_c_unitary_enum_map(self, struct_name, variants):
 423         out_c = "static inline " + struct_name + " " + struct_name + "_from_js(int32_t ord) {\n"
 424         out_c = out_c + "\tswitch (ord) {\n"
 425         ord_v = 0
 426
 427         out_typescript_enum_fields = ""
 428
 429         for var in variants:
 430             out_c = out_c + "\t\tcase %d: return %s;\n" % (ord_v, var)
 431             ord_v = ord_v + 1
 432             out_typescript_enum_fields += f"{var},\n\t\t\t\t"
 433         out_c = out_c + "\t}\n"
 434         out_c = out_c + "\tabort();\n"
 435         out_c = out_c + "}\n"
 436
 437         out_c = out_c + "static inline int32_t " + struct_name + "_to_js(" + struct_name + " val) {\n"
 438         out_c = out_c + "\tswitch (val) {\n"
 439         ord_v = 0
 440         for var in variants:
 441             out_c = out_c + "\t\tcase " + var + ": return %d;\n" % ord_v
 442             ord_v = ord_v + 1
 443         out_c = out_c + "\t\tdefault: abort();\n"
 444         out_c = out_c + "\t}\n"
 445         out_c = out_c + "}\n"
 446
 447         out_typescript_enum = f"""
 448             export enum {struct_name} {{
 449                 {out_typescript_enum_fields}
 450             }}
 451 """
 452
 453         return (out_c, out_typescript_enum, "")
 454
 455     def c_unitary_enum_to_native_call(self, ty_info):
 456         return (ty_info.rust_obj + "_to_js(", ")")
 457     def native_unitary_enum_to_c_call(self, ty_info):
 458         return (ty_info.rust_obj + "_from_js(", ")")
 459
 460     def c_complex_enum_pass_ty(self, struct_name):
 461         return "uint32_t"
 462
 463     def c_constr_native_complex_enum(self, struct_name, variant, c_params):
 464         ret = "0 /* " + struct_name + " - " + variant + " */"
 465         for param in c_params:
 466             ret = ret + "; (void) " + param
 467         return ret
 468
 469     def native_c_map_trait(self, struct_name, field_var_conversions, field_function_lines):
 470         out_typescript_bindings = "\n\n\n// OUT_TYPESCRIPT_BINDINGS :: MAP_TRAIT :: START\n\n"
 471
 472         constructor_arguments = ""
 473         super_instantiator = ""
 474         pointer_to_adder = ""
 475         impl_constructor_arguments = ""
 476         for var in field_var_conversions:
 477             if isinstance(var, ConvInfo):
 478                 constructor_arguments += f", {first_to_lower(var.arg_name)}?: {var.java_hu_ty}"
 479                 impl_constructor_arguments += f", {var.arg_name}: {var.java_hu_ty}"
 480                 if var.from_hu_conv is not None:
 481                     super_instantiator += ", " + var.from_hu_conv[0]
 482                     if var.from_hu_conv[1] != "":
 483                         pointer_to_adder += var.from_hu_conv[1] + ";\n"
 484                 else:
 485                     super_instantiator += ", " + first_to_lower(var.arg_name)
 486             else:
 487                 constructor_arguments += f", {first_to_lower(var[1])}?: bindings.{var[0]}"
 488                 super_instantiator += ", " + first_to_lower(var[1])
 489                 pointer_to_adder += "this.ptrs_to.push(" + first_to_lower(var[1]) + ");\n"
 490                 impl_constructor_arguments += f", {first_to_lower(var[1])}_impl: {var[0].replace('LDK', '')}.{var[0].replace('LDK', '')}Interface"
 491
 492         # BUILD INTERFACE METHODS
 493         out_java_interface = ""
 494         out_interface_implementation_overrides = ""
 495         java_methods = []
 496         for fn_line in field_function_lines:
 497             java_method_descriptor = ""
 498             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 499                 out_java_interface += fn_line.fn_name + "("
 500                 out_interface_implementation_overrides += f"{fn_line.fn_name} ("
 501
 502                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 503                     if idx >= 1:
 504                         out_java_interface += ", "
 505                         out_interface_implementation_overrides += ", "
 506                     out_java_interface += f"{arg_conv_info.arg_name}: {arg_conv_info.java_hu_ty}"
 507                     out_interface_implementation_overrides += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
 508                     java_method_descriptor += arg_conv_info.java_fn_ty_arg
 509                 out_java_interface += f"): {fn_line.ret_ty_info.java_hu_ty};\n\t\t\t\t"
 510                 java_method_descriptor += ")" + fn_line.ret_ty_info.java_fn_ty_arg
 511                 java_methods.append((fn_line.fn_name, java_method_descriptor))
 512
 513                 out_interface_implementation_overrides += f"): {fn_line.ret_ty_info.java_ty} {{\n"
 514
 515                 interface_method_override_inset = "\t\t\t\t\t\t"
 516                 interface_implementation_inset = "\t\t\t\t\t\t\t"
 517                 for arg_info in fn_line.args_ty:
 518                     if arg_info.to_hu_conv is not None:
 519                         out_interface_implementation_overrides += interface_implementation_inset + arg_info.to_hu_conv.replace("\n", "\n\t\t\t\t") + "\n"
 520
 521                 if fn_line.ret_ty_info.java_ty != "void":
 522                     out_interface_implementation_overrides += interface_implementation_inset + fn_line.ret_ty_info.java_hu_ty + " ret = arg." + fn_line.fn_name + "("
 523                 else:
 524                     out_interface_implementation_overrides += f"{interface_implementation_inset}arg." + fn_line.fn_name + "("
 525
 526                 for idx, arg_info in enumerate(fn_line.args_ty):
 527                     if idx != 0:
 528                         out_interface_implementation_overrides += ", "
 529                     if arg_info.to_hu_conv_name is not None:
 530                         out_interface_implementation_overrides += arg_info.to_hu_conv_name
 531                     else:
 532                         out_interface_implementation_overrides += arg_info.arg_name
 533
 534                 out_interface_implementation_overrides += ");\n"
 535                 if fn_line.ret_ty_info.java_ty != "void":
 536                     if fn_line.ret_ty_info.from_hu_conv is not None:
 537                         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"
 538                         if fn_line.ret_ty_info.from_hu_conv[1] != "":
 539                             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"
 540                         #if fn_line.ret_ty_info.rust_obj in result_types:
 541                         # XXX: We need to handle this in conversion logic so that its cross-language!
 542                         # Avoid double-free by breaking the result - we should learn to clone these and then we can be safe instead
 543                         #    out_interface_implementation_overrides = out_interface_implementation_overrides + "\t\t\t\tret.ptr = 0;\n"
 544                         out_interface_implementation_overrides = out_interface_implementation_overrides + "\t\t\t\treturn result;\n"
 545                     else:
 546                         out_interface_implementation_overrides = out_interface_implementation_overrides + "\t\t\t\treturn ret;\n"
 547                 out_interface_implementation_overrides += f"{interface_method_override_inset}}},\n\n{interface_method_override_inset}"
 548
 549         trait_constructor_arguments = ""
 550         for var in field_var_conversions:
 551             if isinstance(var, ConvInfo):
 552                 trait_constructor_arguments += ", " + var.arg_name
 553             else:
 554                 trait_constructor_arguments += ", " + var[1] + ".new_impl(" + var[1] + "_impl).bindings_instance"
 555
 556         out_typescript_human = f"""
 557             {self.hu_struct_file_prefix}
 558
 559             export class {struct_name.replace("LDK","")} extends CommonBase {{
 560
 561                 bindings_instance?: bindings.{struct_name};
 562
 563                 constructor(ptr?: number, arg?: bindings.{struct_name}{constructor_arguments}) {{
 564                     if (Number.isFinite(ptr)) {{
 565                                         super(ptr);
 566                                         this.bindings_instance = null;
 567                                     }} else {{
 568                                         // TODO: private constructor instantiation
 569                                         super(bindings.{struct_name}_new(arg{super_instantiator}));
 570                                         this.ptrs_to.push(arg);
 571                                         {pointer_to_adder}
 572                                     }}
 573                 }}
 574
 575                 protected finalize() {{
 576                     if (this.ptr != 0) {{
 577                         bindings.{struct_name.replace("LDK","")}_free(this.ptr);
 578                     }}
 579                     super.finalize();
 580                 }}
 581
 582                 static new_impl(arg: {struct_name.replace("LDK", "")}Interface{impl_constructor_arguments}): {struct_name.replace("LDK", "")} {{
 583                     const impl_holder: {struct_name}Holder = new {struct_name}Holder();
 584                     let structImplementation = <bindings.{struct_name}>{{
 585                         // todo: in-line interface filling
 586                         {out_interface_implementation_overrides}
 587                     }};
 588                     impl_holder.held = new {struct_name.replace("LDK", "")} (null, structImplementation{trait_constructor_arguments});
 589                 }}
 590             }}
 591
 592             export interface {struct_name.replace("LDK", "")}Interface {{
 593                 {out_java_interface}
 594             }}
 595
 596             class {struct_name}Holder {{
 597                 held: {struct_name.replace("LDK", "")};
 598             }}
 599 """
 600
 601         out_typescript_bindings += "\t\texport interface " + struct_name + " {\n"
 602         java_meths = []
 603         for fn_line in field_function_lines:
 604             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 605                 out_typescript_bindings += f"\t\t\t{fn_line.fn_name} ("
 606
 607                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 608                     if idx >= 1:
 609                         out_typescript_bindings = out_typescript_bindings + ", "
 610                     out_typescript_bindings += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
 611
 612                 out_typescript_bindings += f"): {fn_line.ret_ty_info.java_ty};\n"
 613
 614         out_typescript_bindings = out_typescript_bindings + "\t\t}\n\n"
 615
 616         out_typescript_bindings += f"\t\texport function {struct_name}_new(impl: {struct_name}"
 617         for var in field_var_conversions:
 618             if isinstance(var, ConvInfo):
 619                 out_typescript_bindings += f", {var.arg_name}: {var.java_ty}"
 620             else:
 621                 out_typescript_bindings += f", {var[1]}: {var[0]}"
 622
 623         out_typescript_bindings += f"""): number {{
 624             throw new Error('unimplemented'); // TODO: bind to WASM
 625         }}
 626 """
 627
 628         out_typescript_bindings += '\n// OUT_TYPESCRIPT_BINDINGS :: MAP_TRAIT :: END\n\n\n'
 629
 630         # Now that we've written out our java code (and created java_meths), generate C
 631         out_c = "typedef struct " + struct_name + "_JCalls {\n"
 632         out_c = out_c + "\tatomic_size_t refcnt;\n"
 633         for var in field_var_conversions:
 634             if isinstance(var, ConvInfo):
 635                 # We're a regular ol' field
 636                 pass
 637             else:
 638                 # We're a supertrait
 639                 out_c = out_c + "\t" + var[0] + "_JCalls* " + var[1] + ";\n"
 640         for fn in field_function_lines:
 641             if fn.fn_name != "free" and fn.fn_name != "clone":
 642                 out_c = out_c + "\tuint32_t " + fn.fn_name + "_meth;\n"
 643         out_c = out_c + "} " + struct_name + "_JCalls;\n"
 644
 645         for fn_line in field_function_lines:
 646             if fn_line.fn_name == "free":
 647                 out_c = out_c + "static void " + struct_name + "_JCalls_free(void* this_arg) {\n"
 648                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 649                 out_c = out_c + "\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n"
 650                 for fn in field_function_lines:
 651                     if fn.fn_name != "free" and fn.fn_name != "clone":
 652                         out_c = out_c + "\t\tjs_free(j_calls->" + fn.fn_name + "_meth);\n"
 653                 out_c = out_c + "\t\tFREE(j_calls);\n"
 654                 out_c = out_c + "\t}\n}\n"
 655
 656         for idx, fn_line in enumerate(field_function_lines):
 657             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 658                 assert fn_line.ret_ty_info.ty_info.get_full_rust_ty()[1] == ""
 659                 out_c = out_c + fn_line.ret_ty_info.ty_info.get_full_rust_ty()[0] + " " + fn_line.fn_name + "_jcall("
 660                 if fn_line.self_is_const:
 661                     out_c = out_c + "const void* this_arg"
 662                 else:
 663                     out_c = out_c + "void* this_arg"
 664
 665                 for idx, arg in enumerate(fn_line.args_ty):
 666                     out_c = out_c + ", " + arg.ty_info.get_full_rust_ty()[0] + " " + arg.arg_name + arg.ty_info.get_full_rust_ty()[1]
 667
 668                 out_c = out_c + ") {\n"
 669                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 670
 671                 for arg_info in fn_line.args_ty:
 672                     if arg_info.ret_conv is not None:
 673                         out_c = out_c + "\t" + arg_info.ret_conv[0].replace('\n', '\n\t')
 674                         out_c = out_c + arg_info.arg_name
 675                         out_c = out_c + arg_info.ret_conv[1].replace('\n', '\n\t') + "\n"
 676
 677                 if fn_line.ret_ty_info.c_ty.endswith("Array"):
 678                     out_c = out_c + "\t" + fn_line.ret_ty_info.c_ty + " arg = js_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->" + fn_line.fn_name + "_meth"
 679                 elif fn_line.ret_ty_info.java_ty == "void":
 680                     out_c = out_c + "\tjs_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->" + fn_line.fn_name + "_meth"
 681                 elif not fn_line.ret_ty_info.passed_as_ptr:
 682                     out_c = out_c + "\treturn js_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->" + fn_line.fn_name + "_meth"
 683                 else:
 684                     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"
 685
 686                 for idx, arg_info in enumerate(fn_line.args_ty):
 687                     if arg_info.ret_conv is not None:
 688                         out_c = out_c + ", " + arg_info.ret_conv_name
 689                     else:
 690                         out_c = out_c + ", " + arg_info.arg_name
 691                 out_c = out_c + ");\n"
 692                 if fn_line.ret_ty_info.arg_conv is not None:
 693                     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"
 694
 695                 out_c = out_c + "}\n"
 696
 697         # Write out a clone function whether we need one or not, as we use them in moving to rust
 698         out_c = out_c + "static void* " + struct_name + "_JCalls_clone(const void* this_arg) {\n"
 699         out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 700         out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n"
 701         for var in field_var_conversions:
 702             if not isinstance(var, ConvInfo):
 703                 out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->" + var[1] + "->refcnt, 1, memory_order_release);\n"
 704         out_c = out_c + "\treturn (void*) this_arg;\n"
 705         out_c = out_c + "}\n"
 706
 707         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_init (" + self.c_fn_args_pfx + ", /*TODO: JS Object Reference */void* o"
 708         for var in field_var_conversions:
 709             if isinstance(var, ConvInfo):
 710                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 711             else:
 712                 out_c = out_c + ", /*TODO: JS Object Reference */void* " + var[1]
 713         out_c = out_c + ") {\n"
 714
 715         out_c = out_c + "\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n"
 716         out_c = out_c + "\tatomic_init(&calls->refcnt, 1);\n"
 717         out_c = out_c + "\t//TODO: Assign calls->o from o\n"
 718
 719         for (fn_name, java_meth_descr) in java_meths:
 720             if fn_name != "free" and fn_name != "clone":
 721                 out_c = out_c + "\tcalls->" + fn_name + "_meth = (*env)->GetMethodID(env, c, \"" + fn_name + "\", \"" + java_meth_descr + "\");\n"
 722                 out_c = out_c + "\tCHECK(calls->" + fn_name + "_meth != NULL);\n"
 723
 724         for var in field_var_conversions:
 725             if isinstance(var, ConvInfo) and var.arg_conv is not None:
 726                 out_c = out_c + "\n\t" + var.arg_conv.replace("\n", "\n\t") +"\n"
 727         out_c = out_c + "\n\t" + struct_name + " ret = {\n"
 728         out_c = out_c + "\t\t.this_arg = (void*) calls,\n"
 729         for fn_line in field_function_lines:
 730             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 731                 out_c = out_c + "\t\t." + fn_line.fn_name + " = " + fn_line.fn_name + "_jcall,\n"
 732             elif fn_line.fn_name == "free":
 733                 out_c = out_c + "\t\t.free = " + struct_name + "_JCalls_free,\n"
 734             else:
 735                 out_c = out_c + "\t\t.clone = " + struct_name + "_JCalls_clone,\n"
 736         for var in field_var_conversions:
 737             if isinstance(var, ConvInfo):
 738                 if var.arg_conv_name is not None:
 739                     out_c = out_c + "\t\t." + var.arg_name + " = " + var.arg_conv_name + ",\n"
 740                     out_c = out_c + "\t\t.set_" + var.arg_name + " = NULL,\n"
 741                 else:
 742                     out_c = out_c + "\t\t." + var.var_name + " = " + var.var_name + ",\n"
 743                     out_c = out_c + "\t\t.set_" + var.var_name + " = NULL,\n"
 744             else:
 745                 out_c = out_c + "\t\t." + var[1] + " = " + var[0] + "_init(NULL, " + var[1] + "),\n"
 746         out_c = out_c + "\t};\n"
 747         for var in field_var_conversions:
 748             if not isinstance(var, ConvInfo):
 749                 out_c = out_c + "\tcalls->" + var[1] + " = ret." + var[1] + ".this_arg;\n"
 750         out_c = out_c + "\treturn ret;\n"
 751         out_c = out_c + "}\n"
 752
 753         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"
 754         for var in field_var_conversions:
 755             if isinstance(var, ConvInfo):
 756                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 757             else:
 758                 out_c = out_c + ", /*TODO: JS Object Reference */ void* " + var[1]
 759         out_c = out_c + ") {\n"
 760         out_c = out_c + "\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n"
 761         out_c = out_c + "\t*res_ptr = " + struct_name + "_init(NULL, o"
 762         for var in field_var_conversions:
 763             if isinstance(var, ConvInfo):
 764                 out_c = out_c + ", " + var.arg_name
 765             else:
 766                 out_c = out_c + ", " + var[1]
 767         out_c = out_c + ");\n"
 768         out_c = out_c + "\treturn (long)res_ptr;\n"
 769         out_c = out_c + "}\n"
 770
 771         return (out_typescript_bindings, out_typescript_human, out_c)
 772
 773     def trait_struct_inc_refcnt(self, ty_info):
 774         return ""
 775
 776     def map_complex_enum(self, struct_name, variant_list, camel_to_snake):
 777         java_hu_type = struct_name.replace("LDK", "")
 778
 779         out_java_enum = ""
 780         out_java = ""
 781         out_c = ""
 782
 783         out_java_enum += (self.hu_struct_file_prefix)
 784         out_java_enum += ("export default class " + java_hu_type + " extends CommonBase {\n")
 785         out_java_enum += ("\tprotected constructor(_dummy: object, ptr: number) { super(ptr); }\n")
 786         out_java_enum += ("\tprotected finalize() {\n")
 787         out_java_enum += ("\t\tsuper.finalize();\n")
 788         out_java_enum += ("\t\tif (this.ptr != 0) { bindings." + java_hu_type + "_free(this.ptr); }\n")
 789         out_java_enum += ("\t}\n")
 790         out_java_enum += f"\tstatic constr_from_ptr(ptr: number): {java_hu_type} {{\n"
 791         out_java_enum += (f"\t\tconst raw_val: bindings.{struct_name} = bindings." + struct_name + "_ref_from_ptr(ptr);\n")
 792         java_hu_subclasses = ""
 793
 794         out_java +=  ("\tpublic static class " + struct_name + " {\n")
 795         out_java +=  ("\t\tprivate " + struct_name + "() {}\n")
 796         for var in variant_list:
 797             out_java +=  ("\t\texport class " + var.var_name + " extends " + struct_name + " {\n")
 798             java_hu_subclasses = java_hu_subclasses + "export class " + var.var_name + " extends " + java_hu_type + " {\n"
 799             out_java_enum += ("\t\tif (raw_val instanceof bindings." + struct_name + "." + var.var_name + ") {\n")
 800             out_java_enum += ("\t\t\treturn new " + var.var_name + "(this.ptr, raw_val);\n")
 801             init_meth_params = ""
 802             init_meth_body = ""
 803             hu_conv_body = ""
 804             for idx, field_ty in enumerate(var.fields):
 805                 out_java += ("\t\t\tpublic " + field_ty.java_ty + " " + field_ty.arg_name + ";\n")
 806                 java_hu_subclasses = java_hu_subclasses + "\tpublic " + field_ty.arg_name + f": {field_ty.java_hu_ty};\n"
 807                 if field_ty.to_hu_conv is not None:
 808                     hu_conv_body = hu_conv_body + "\t\tconst " + field_ty.arg_name + f": {field_ty.java_ty} = obj." + field_ty.arg_name + ";\n"
 809                     hu_conv_body = hu_conv_body + "\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
 810                     hu_conv_body = hu_conv_body + "\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
 811                 else:
 812                     hu_conv_body = hu_conv_body + "\t\tthis." + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
 813                 if idx > 0:
 814                     init_meth_params = init_meth_params + ", "
 815                 init_meth_params = init_meth_params + field_ty.java_ty + " " + field_ty.arg_name
 816                 init_meth_body = init_meth_body + "this." + field_ty.arg_name + " = " + field_ty.arg_name + "; "
 817             out_java +=  ("\t\t\t" + var.var_name + "(" + init_meth_params + ") { ")
 818             out_java +=  (init_meth_body)
 819             out_java +=  ("}\n")
 820             out_java += ("\t\t}\n")
 821             out_java_enum += ("\t\t}\n")
 822             java_hu_subclasses = java_hu_subclasses + "\tprivate constructor(ptr: number, obj: bindings." + struct_name + "." + var.var_name + ") {\n\t\tsuper(null, ptr);\n"
 823             java_hu_subclasses = java_hu_subclasses + hu_conv_body
 824             java_hu_subclasses = java_hu_subclasses + "\t}\n}\n"
 825         out_java += ("\t\tstatic native void init();\n")
 826         out_java += ("\t}\n")
 827         out_java_enum += ("\t\tthrow new Error('oops, this should be unreachable'); // Unreachable without extending the (internal) bindings interface\n\t}\n\n")
 828         out_java += ("\tstatic { " + struct_name + ".init(); }\n")
 829         out_java += ("\tpublic static native " + struct_name + " " + struct_name + "_ref_from_ptr(long ptr);\n");
 830
 831         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")
 832         out_c += ("\t" + struct_name + " *obj = (" + struct_name + "*)ptr;\n")
 833         out_c += ("\tswitch(obj->tag) {\n")
 834         for var in variant_list:
 835             out_c += ("\t\tcase " + struct_name + "_" + var.var_name + ": {\n")
 836             c_params = []
 837             for idx, field_map in enumerate(var.fields):
 838                 if field_map.ret_conv is not None:
 839                     out_c += ("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
 840                     out_c += ("obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name)
 841                     out_c += (field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
 842                     c_params.append(field_map.ret_conv_name)
 843                 else:
 844                     c_params.append("obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name)
 845             out_c += ("\t\t\treturn " + self.c_constr_native_complex_enum(struct_name, var.var_name, c_params) + ";\n")
 846             out_c += ("\t\t}\n")
 847         out_c += ("\t\tdefault: abort();\n")
 848         out_c += ("\t}\n}\n")
 849         out_java_enum += ("}\n")
 850         out_java_enum += (java_hu_subclasses)
 851         return (out_java, out_java_enum, out_c)
 852
 853     def map_opaque_struct(self, struct_name):
 854         implementations = ""
 855         method_header = ""
 856         if struct_name.startswith("LDKLocked"):
 857             implementations += "implements AutoCloseable "
 858             method_header = """
 859                 public close() {
 860 """
 861         else:
 862             method_header = """
 863                 protected finalize() {
 864                     super.finalize();
 865 """
 866
 867         out_opaque_struct_human = f"""
 868             {self.hu_struct_file_prefix}
 869
 870             export default class {struct_name.replace("LDK","")} extends CommonBase {implementations}{{
 871                 constructor(_dummy: object, ptr: number) {{
 872                     super(ptr);
 873                 }}
 874
 875                 {method_header}
 876                     if (this.ptr != 0) {{
 877                         bindings.{struct_name.replace("LDK","")}_free(this.ptr);
 878                     }}
 879                 }}
 880 """
 881         return out_opaque_struct_human
 882
 883     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):
 884         out_java = ""
 885         out_c = ""
 886         out_java_struct = None
 887
 888         out_java += ("\tpublic static native ")
 889         out_c += (self.c_fn_ty_pfx)
 890         out_c += (return_type_info.c_ty)
 891         out_java += (return_type_info.java_ty)
 892         if return_type_info.ret_conv is not None:
 893             ret_conv_pfx, ret_conv_sfx = return_type_info.ret_conv
 894         out_java += (" " + method_name + "(")
 895         out_c += (" " + self.c_fn_name_pfx + method_name.replace('_', '_1') + "(" + self.c_fn_args_pfx)
 896
 897         method_argument_string = ""
 898         native_call_argument_string = ""
 899         for idx, arg_conv_info in enumerate(argument_types):
 900             if idx != 0:
 901                 method_argument_string += (", ")
 902                 native_call_argument_string += ', '
 903             if arg_conv_info.c_ty != "void":
 904                 out_c += (", ")
 905             if arg_conv_info.c_ty != "void":
 906                 out_c += (arg_conv_info.c_ty + " " + arg_conv_info.arg_name)
 907                 needs_encoding = arg_conv_info.c_ty in self.wasm_encoding_map
 908                 native_argument = arg_conv_info.arg_name
 909                 if needs_encoding:
 910                     converter = self.wasm_encoding_map[arg_conv_info.c_ty]
 911                     native_argument = f"{converter}({arg_conv_info.arg_name})"
 912                 method_argument_string += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
 913                 native_call_argument_string += native_argument
 914
 915         has_return_value = return_type_info.c_ty != 'void'
 916         needs_decoding = return_type_info.c_ty in self.wasm_decoding_map
 917         return_statement = 'return nativeResponseValue;'
 918         if not has_return_value:
 919             return_statement = '// debug statements here'
 920         elif needs_decoding:
 921             converter = self.wasm_decoding_map[return_type_info.c_ty]
 922             return_statement = f"return {converter}(nativeResponseValue);"
 923
 924         out_java = f"""\texport function {method_name}({method_argument_string}): {return_type_info.java_ty} {{
 925                 if(!isWasmInitialized) {{
 926                         throw new Error("initializeWasm() must be awaited first!");
 927                 }}
 928                 const nativeResponseValue = wasm.{method_name}({native_call_argument_string});
 929                 {return_statement}
 930         }}
 931 """
 932
 933         if has_out_java_struct:
 934             out_java_struct = ""
 935             if not args_known:
 936                 out_java_struct += ("\t// Skipped " + method_name + "\n")
 937                 has_out_java_struct = False
 938             else:
 939                 meth_n = method_name[len(struct_meth) + 1:]
 940                 if not takes_self:
 941                     out_java_struct += (
 942                             "\tpublic static " + return_type_info.java_hu_ty + " constructor_" + meth_n + "(")
 943                 else:
 944                     out_java_struct += ("\tpublic " + return_type_info.java_hu_ty + " " + meth_n + "(")
 945                 for idx, arg in enumerate(argument_types):
 946                     if idx != 0:
 947                         if not takes_self or idx > 1:
 948                             out_java_struct += (", ")
 949                     elif takes_self:
 950                         continue
 951                     if arg.java_ty != "void":
 952                         if arg.arg_name in default_constructor_args:
 953                             for explode_idx, explode_arg in enumerate(default_constructor_args[arg.arg_name]):
 954                                 if explode_idx != 0:
 955                                     out_java_struct += (", ")
 956                                 out_java_struct += (
 957                                         explode_arg.java_hu_ty + " " + arg.arg_name + "_" + explode_arg.arg_name)
 958                         else:
 959                             out_java_struct += (arg.java_hu_ty + " " + arg.arg_name)
 960
 961         out_c += (") {\n")
 962         if out_java_struct is not None:
 963             out_java_struct += (") {\n")
 964         for info in argument_types:
 965             if info.arg_conv is not None:
 966                 out_c += ("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
 967         if return_type_info.ret_conv is not None:
 968             out_c += ("\t" + ret_conv_pfx.replace('\n', '\n\t'))
 969         elif return_type_info.c_ty != "void":
 970             out_c += ("\t" + return_type_info.c_ty + " ret_val = ")
 971         else:
 972             out_c += ("\t")
 973         if c_call_string is None:
 974             out_c += (method_name + "(")
 975         else:
 976             out_c += (c_call_string)
 977         for idx, info in enumerate(argument_types):
 978             if info.arg_conv_name is not None:
 979                 if idx != 0:
 980                     out_c += (", ")
 981                 elif c_call_string is not None:
 982                     continue
 983                 out_c += (info.arg_conv_name)
 984         out_c += (")")
 985         if return_type_info.ret_conv is not None:
 986             out_c += (ret_conv_sfx.replace('\n', '\n\t'))
 987         else:
 988             out_c += (";")
 989         for info in argument_types:
 990             if info.arg_conv_cleanup is not None:
 991                 out_c += ("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
 992         if return_type_info.ret_conv is not None:
 993             out_c += ("\n\treturn " + return_type_info.ret_conv_name + ";")
 994         elif return_type_info.c_ty != "void":
 995             out_c += ("\n\treturn ret_val;")
 996         out_c += ("\n}\n\n")
 997
 998         if has_out_java_struct:
 999             out_java_struct += ("\t\t")
1000             if return_type_info.java_ty != "void":
1001                 out_java_struct += (return_type_info.java_ty + " ret = ")
1002             out_java_struct += ("bindings." + method_name + "(")
1003             for idx, info in enumerate(argument_types):
1004                 if idx != 0:
1005                     out_java_struct += (", ")
1006                 if idx == 0 and takes_self:
1007                     out_java_struct += ("this.ptr")
1008                 elif info.arg_name in default_constructor_args:
1009                     out_java_struct += ("bindings." + info.java_hu_ty + "_new(")
1010                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
1011                         if explode_idx != 0:
1012                             out_java_struct += (", ")
1013                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1014                         if explode_arg.from_hu_conv is not None:
1015                             out_java_struct += (
1016                                 explode_arg.from_hu_conv[0].replace(explode_arg.arg_name, expl_arg_name))
1017                         else:
1018                             out_java_struct += (expl_arg_name)
1019                     out_java_struct += (")")
1020                 elif info.from_hu_conv is not None:
1021                     out_java_struct += (info.from_hu_conv[0])
1022                 else:
1023                     out_java_struct += (info.arg_name)
1024             out_java_struct += (");\n")
1025             if return_type_info.to_hu_conv is not None:
1026                 if not takes_self:
1027                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t").replace("this",
1028                                                                                                              return_type_info.to_hu_conv_name) + "\n")
1029                 else:
1030                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t") + "\n")
1031
1032             for idx, info in enumerate(argument_types):
1033                 if idx == 0 and takes_self:
1034                     pass
1035                 elif info.arg_name in default_constructor_args:
1036                     for explode_arg in default_constructor_args[info.arg_name]:
1037                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1038                         if explode_arg.from_hu_conv is not None and return_type_info.to_hu_conv_name:
1039                             out_java_struct += ("\t\t" + explode_arg.from_hu_conv[1].replace(explode_arg.arg_name,
1040                                                                                              expl_arg_name).replace(
1041                                 "this", return_type_info.to_hu_conv_name) + ";\n")
1042                 elif info.from_hu_conv is not None and info.from_hu_conv[1] != "":
1043                     if not takes_self and return_type_info.to_hu_conv_name is not None:
1044                         out_java_struct += (
1045                                 "\t\t" + info.from_hu_conv[1].replace("this", return_type_info.to_hu_conv_name) + ";\n")
1046                     else:
1047                         out_java_struct += ("\t\t" + info.from_hu_conv[1] + ";\n")
1048
1049             if return_type_info.to_hu_conv_name is not None:
1050                 out_java_struct += ("\t\treturn " + return_type_info.to_hu_conv_name + ";\n")
1051             elif return_type_info.java_ty != "void" and return_type_info.rust_obj != "LDK" + struct_meth:
1052                 out_java_struct += ("\t\treturn ret;\n")
1053             out_java_struct += ("\t}\n\n")
1054
1055         return (out_java, out_c, out_java_struct)