_ 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, outdir: str, **kwargs):
  15         self.outdir = outdir
  16         self.struct_file_suffixes = {}
  17         self.c_type_map = dict(
  18             uint8_t = ['number', 'Uint8Array'],
  19             uint16_t = ['number', 'Uint16Array'],
  20             uint32_t = ['number', 'Uint32Array'],
  21             uint64_t = ['number'],
  22         )
  23
  24         self.wasm_decoding_map = dict(
  25             int8_tArray = 'decodeUint8Array'
  26         )
  27
  28         self.wasm_encoding_map = dict(
  29             int8_tArray = 'encodeUint8Array',
  30         )
  31
  32         self.to_hu_conv_templates = dict(
  33             ptr = 'const {var_name}_hu_conv: {human_type} = new {human_type}(null, {var_name});',
  34             default = 'const {var_name}_hu_conv: {human_type} = new {human_type}(null, {var_name});',
  35         )
  36
  37         self.bindings_header = self.wasm_import_header(target) + """
  38 export class VecOrSliceDef {
  39     public dataptr: number;
  40     public datalen: number;
  41     public stride: number;
  42     public constructor(dataptr: number, datalen: number, stride: number) {
  43         this.dataptr = dataptr;
  44         this.datalen = datalen;
  45         this.stride = stride;
  46     }
  47 }
  48
  49 /*
  50 TODO: load WASM file
  51 static {
  52     System.loadLibrary(\"lightningjni\");
  53     init(java.lang.Enum.class, VecOrSliceDef.class);
  54     init_class_cache();
  55 }
  56
  57 static native void init(java.lang.Class c, java.lang.Class slicedef);
  58 static native void init_class_cache();
  59
  60 public static native boolean deref_bool(long ptr);
  61 public static native long deref_long(long ptr);
  62 public static native void free_heap_ptr(long ptr);
  63 public static native byte[] read_bytes(long ptr, long len);
  64 public static native byte[] get_u8_slice_bytes(long slice_ptr);
  65 public static native long bytes_to_u8_vec(byte[] bytes);
  66 public static native long new_txpointer_copy_data(byte[] txdata);
  67 public static native void txpointer_free(long ptr);
  68 public static native byte[] txpointer_get_buffer(long ptr);
  69 public static native long vec_slice_len(long vec);
  70 public static native long new_empty_slice_vec();
  71 */
  72
  73 """
  74
  75         self.bindings_version_file = ""
  76
  77         self.bindings_footer = ""
  78
  79         self.util_fn_pfx = ""
  80         self.util_fn_sfx = ""
  81
  82         self.common_base = """
  83 function freer(f: () => void) { f() }
  84 const finalizer = new FinalizationRegistry(freer);
  85 function get_freeer(ptr: number, free_fn: (number) => void) {
  86         return () => {
  87                 free_fn(ptr);
  88         }
  89 }
  90
  91 export default class CommonBase {
  92         protected ptr: number;
  93         protected ptrs_to: object[] = [];
  94         protected constructor(ptr: number, free_fn: (ptr: number) => void) {
  95                 this.ptr = ptr;
  96                 if (Number.isFinite(ptr) && ptr != 0){
  97                         finalizer.register(this, get_freeer(ptr, free_fn));
  98                 }
  99         }
 100         // In Java, protected means "any subclass can access fields on any other subclass'"
 101         // In TypeScript, protected means "any subclass can access parent fields on instances of itself"
 102         // To work around this, we add accessors for other instances' protected fields here.
 103         protected static add_ref_from(holder: CommonBase, referent: object) {
 104                 holder.ptrs_to.push(referent);
 105         }
 106         protected static get_ptr_of(o: CommonBase) {
 107                 return o.ptr;
 108         }
 109         protected static set_null_skip_free(o: CommonBase) {
 110                 o.ptr = 0;
 111                 finalizer.unregister(o);
 112         }
 113 }
 114 """
 115
 116         self.c_file_pfx = """#include "js-wasm.h"
 117 #include <stdatomic.h>
 118 #include <lightning.h>
 119
 120 // These should be provided...somehow...
 121 void *memset(void *s, int c, size_t n);
 122 void *memcpy(void *dest, const void *src, size_t n);
 123 int memcmp(const void *s1, const void *s2, size_t n);
 124
 125 void __attribute__((noreturn)) abort(void);
 126 static inline void assert(bool expression) {
 127         if (!expression) { abort(); }
 128 }
 129 """
 130
 131         if not DEBUG:
 132             self.c_file_pfx = self.c_file_pfx + """
 133 void *malloc(size_t size);
 134 void free(void *ptr);
 135
 136 #define MALLOC(a, _) malloc(a)
 137 #define FREE(p) if ((unsigned long)(p) > 4096) { free(p); }
 138 #define DO_ASSERT(a) (void)(a)
 139 #define CHECK(a)
 140 #define CHECK_ACCESS(p)
 141 #define CHECK_INNER_FIELD_ACCESS_OR_NULL(v)
 142 """
 143         else:
 144             self.c_file_pfx = self.c_file_pfx + """
 145 // Always run a, then assert it is true:
 146 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
 147 // Assert a is true or do nothing
 148 #define CHECK(a) DO_ASSERT(a)
 149
 150 // Running a leak check across all the allocations and frees of the JDK is a mess,
 151 // so instead we implement our own naive leak checker here, relying on the -wrap
 152 // linker option to wrap malloc/calloc/realloc/free, tracking everyhing allocated
 153 // and free'd in Rust or C across the generated bindings shared library.
 154
 155 #define BT_MAX 128
 156 typedef struct allocation {
 157         struct allocation* next;
 158         void* ptr;
 159         const char* struct_name;
 160 } allocation;
 161 static allocation* allocation_ll = NULL;
 162
 163 void* __real_malloc(size_t len);
 164 void* __real_calloc(size_t nmemb, size_t len);
 165 static void new_allocation(void* res, const char* struct_name) {
 166         allocation* new_alloc = __real_malloc(sizeof(allocation));
 167         new_alloc->ptr = res;
 168         new_alloc->struct_name = struct_name;
 169         new_alloc->next = allocation_ll;
 170         allocation_ll = new_alloc;
 171 }
 172 static void* MALLOC(size_t len, const char* struct_name) {
 173         void* res = __real_malloc(len);
 174         new_allocation(res, struct_name);
 175         return res;
 176 }
 177 void __real_free(void* ptr);
 178 static void alloc_freed(void* ptr) {
 179         allocation* p = NULL;
 180         allocation* it = allocation_ll;
 181         while (it->ptr != ptr) {
 182                 p = it; it = it->next;
 183                 if (it == NULL) {
 184                         //XXX: fprintf(stderr, "Tried to free unknown pointer %p\\n", ptr);
 185                         return; // addrsan should catch malloc-unknown and print more info than we have
 186                 }
 187         }
 188         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
 189         DO_ASSERT(it->ptr == ptr);
 190         __real_free(it);
 191 }
 192 static void FREE(void* ptr) {
 193         if ((unsigned long)ptr <= 4096) return; // Rust loves to create pointers to the NULL page for dummys
 194         alloc_freed(ptr);
 195         __real_free(ptr);
 196 }
 197
 198 static void CHECK_ACCESS(const void* ptr) {
 199         allocation* it = allocation_ll;
 200         while (it->ptr != ptr) {
 201                 it = it->next;
 202                 if (it == NULL) {
 203                         return; // addrsan should catch malloc-unknown and print more info than we have
 204                 }
 205         }
 206 }
 207 #define CHECK_INNER_FIELD_ACCESS_OR_NULL(v) \\
 208         if (v.is_owned && v.inner != NULL) { \\
 209                 const void *p = __unmangle_inner_ptr(v.inner); \\
 210                 if (p != NULL) { \\
 211                         CHECK_ACCESS(p); \\
 212                 } \\
 213         }
 214
 215 void* __wrap_malloc(size_t len) {
 216         void* res = __real_malloc(len);
 217         new_allocation(res, "malloc call");
 218         return res;
 219 }
 220 void* __wrap_calloc(size_t nmemb, size_t len) {
 221         void* res = __real_calloc(nmemb, len);
 222         new_allocation(res, "calloc call");
 223         return res;
 224 }
 225 void __wrap_free(void* ptr) {
 226         if (ptr == NULL) return;
 227         alloc_freed(ptr);
 228         __real_free(ptr);
 229 }
 230
 231 void* __real_realloc(void* ptr, size_t newlen);
 232 void* __wrap_realloc(void* ptr, size_t len) {
 233         if (ptr != NULL) alloc_freed(ptr);
 234         void* res = __real_realloc(ptr, len);
 235         new_allocation(res, "realloc call");
 236         return res;
 237 }
 238 void __wrap_reallocarray(void* ptr, size_t new_sz) {
 239         // Rust doesn't seem to use reallocarray currently
 240         DO_ASSERT(false);
 241 }
 242
 243 void __attribute__((destructor)) check_leaks() {
 244         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 245                 //XXX: fprintf(stderr, "%s %p remains\\n", a->struct_name, a->ptr);
 246         }
 247         DO_ASSERT(allocation_ll == NULL);
 248 }
 249 """
 250         self.c_file_pfx = self.c_file_pfx + """
 251 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
 252 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
 253 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
 254 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
 255
 256 _Static_assert(sizeof(void*) == 4, "Pointers mut be 32 bits");
 257
 258 #define DECL_ARR_TYPE(ty, name) \\
 259         struct name##array { \\
 260                 uint32_t arr_len; \\
 261                 ty elems[]; \\
 262         }; \\
 263         typedef struct name##array * name##Array; \\
 264         static inline name##Array init_##name##Array(size_t arr_len) { \\
 265                 name##Array arr = (name##Array)MALLOC(arr_len * sizeof(ty) + sizeof(uint32_t), "##name array init"); \\
 266                 arr->arr_len = arr_len; \\
 267                 return arr; \\
 268         }
 269
 270 DECL_ARR_TYPE(int64_t, int64_t);
 271 DECL_ARR_TYPE(int8_t, int8_t);
 272 DECL_ARR_TYPE(uint32_t, uint32_t);
 273 DECL_ARR_TYPE(void*, ptr);
 274 DECL_ARR_TYPE(char, char);
 275 typedef charArray jstring;
 276
 277 static inline jstring str_ref_to_ts(const char* chars, size_t len) {
 278         charArray arr = init_charArray(len);
 279         memcpy(arr->elems, chars, len);
 280         return arr;
 281 }
 282 static inline LDKStr str_ref_to_owned_c(const jstring str) {
 283         char* newchars = MALLOC(str->arr_len + 1, "String chars");
 284         memcpy(newchars, str->elems, str->arr_len);
 285         newchars[str->arr_len] = 0;
 286         LDKStr res = {
 287                 .chars = newchars,
 288                 .len = str->arr_len,
 289                 .chars_is_owned = true
 290         };
 291         return res;
 292 }
 293
 294 typedef bool jboolean;
 295
 296 uint32_t __attribute__((visibility("default"))) TS_malloc(uint32_t size) {
 297         return (uint32_t)MALLOC(size, "JS-Called malloc");
 298 }
 299 void __attribute__((visibility("default"))) TS_free(uint32_t ptr) {
 300         FREE((void*)ptr);
 301 }
 302 """
 303
 304         self.c_version_file = ""
 305
 306         self.hu_struct_file_prefix = """
 307 import CommonBase from './CommonBase.mjs';
 308 import * as bindings from '../bindings.mjs'
 309 import * as InternalUtils from '../InternalUtils.mjs'
 310
 311 """
 312         self.c_fn_ty_pfx = ""
 313         self.file_ext = ".mts"
 314         self.ptr_c_ty = "uint32_t"
 315         self.ptr_native_ty = "number"
 316         self.result_c_ty = "uint32_t"
 317         self.ptr_arr = "ptrArray"
 318         self.is_arr_some_check = ("", " != 0")
 319         self.get_native_arr_len_call = ("", "->arr_len")
 320
 321         with open(outdir + "/InternalUtils.mts", "w") as f:
 322             f.write("export function check_arr_len(arr: Uint8Array, len: number): Uint8Array {\n")
 323             f.write("\tif (arr.length != len) { throw new Error(\"Expected array of length \" + len + \"got \" + arr.length); }\n")
 324             f.write("\treturn arr;\n")
 325             f.write("}")
 326
 327     def release_native_arr_ptr_call(self, ty_info, arr_var, arr_ptr_var):
 328         return None
 329     def create_native_arr_call(self, arr_len, ty_info):
 330         if ty_info.c_ty == "ptrArray":
 331             assert ty_info.subty is not None and ty_info.subty.c_ty.endswith("Array")
 332         return "init_" + ty_info.c_ty + "(" + arr_len + ")"
 333     def set_native_arr_contents(self, arr_name, arr_len, ty_info):
 334         if ty_info.c_ty == "int8_tArray":
 335             return ("memcpy(" + arr_name + "->elems, ", ", " + arr_len + ")")
 336         else:
 337             assert False
 338     def get_native_arr_contents(self, arr_name, dest_name, arr_len, ty_info, copy):
 339         if ty_info.c_ty == "int8_tArray":
 340             if copy:
 341                 return "memcpy(" + dest_name + ", " + arr_name + "->elems, " + arr_len + ")"
 342         if ty_info.c_ty == "ptrArray":
 343             return "(void*) " + arr_name + "->elems"
 344         else:
 345             assert not copy
 346             return arr_name + "->elems"
 347     def get_native_arr_elem(self, arr_name, idxc, ty_info):
 348         assert False # Only called if above is None
 349     def get_native_arr_ptr_call(self, ty_info):
 350         if ty_info.subty is not None:
 351             return "(" + ty_info.subty.c_ty + "*)(", " + 4)"
 352         return "(" + ty_info.c_ty + "*)(", " + 4)"
 353     def get_native_arr_entry_call(self, ty_info, arr_name, idxc, entry_access):
 354         return None
 355     def cleanup_native_arr_ref_contents(self, arr_name, dest_name, arr_len, ty_info):
 356         if ty_info.c_ty == "int8_tArray":
 357             return None
 358         else:
 359             return None
 360
 361     def str_ref_to_native_call(self, var_name, str_len):
 362         return "str_ref_to_ts(" + var_name + ", " + str_len + ")"
 363     def str_ref_to_c_call(self, var_name):
 364         return "str_ref_to_owned_c(" + var_name + ")"
 365
 366     def c_fn_name_define_pfx(self, fn_name, have_args):
 367         return " __attribute__((visibility(\"default\"))) TS_" + fn_name + "("
 368
 369     def wasm_import_header(self, target):
 370         res = """
 371 const imports: any = {};
 372 imports.env = {};
 373
 374 imports.env.tableBase = 0;
 375 imports.env.table = new WebAssembly.Table({initial: 4, element: 'anyfunc'});
 376
 377 imports.env["abort"] = function () {
 378         console.error("ABORT");
 379 };
 380 imports.env["js_invoke_function"] = function(fn: number, arg1: number, arg2: number, arg3: number, arg4: number, arg5: number, arg6: number, arg7: number, arg8: number, arg9: number, arg10: number) {
 381         console.log('function called from wasm:', fn, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9, arg10);
 382 };
 383 imports.env["js_free_function_ptr"] = function(fn: number) {
 384         console.log("function ptr free'd from wasm:", fn);
 385 };
 386
 387 imports.wasi_snapshot_preview1 = {
 388         "fd_write" : () => {
 389                 console.log("ABORT");
 390         },
 391         "random_get" : () => {
 392                 console.log("RAND GET");
 393         },
 394         "environ_sizes_get" : () => {
 395                 console.log("wasi_snapshot_preview1:environ_sizes_get");
 396         },
 397         "proc_exit" : () => {
 398                 console.log("wasi_snapshot_preview1:proc_exit");
 399         },
 400         "environ_get" : () => {
 401                 console.log("wasi_snapshot_preview1:environ_get");
 402         },
 403 };
 404
 405 var wasm = null;
 406 let isWasmInitialized: boolean = false;
 407 """
 408
 409         if target == Target.NODEJS:
 410             res += """import * as fs from 'fs';
 411 export async function initializeWasm(path) {
 412         const source = fs.readFileSync(path);
 413         const { instance: wasmInstance } = await WebAssembly.instantiate(source, imports);
 414         wasm = wasmInstance.exports;
 415         isWasmInitialized = true;
 416 };
 417 """
 418         else:
 419             res += """
 420 export async function initializeWasm(uri) {
 421         const stream = fetch(uri);
 422         const { instance: wasmInstance } = await WebAssembly.instantiateStreaming(stream, imports);
 423         wasm = wasmInstance.exports;
 424         isWasmInitialized = true;
 425 };
 426
 427 """
 428
 429         return res + """
 430
 431
 432 // WASM CODEC
 433
 434 const nextMultipleOfFour = (value: number) => {
 435         return Math.ceil(value / 4) * 4;
 436 }
 437
 438 const encodeUint8Array = (inputArray) => {
 439         const cArrayPointer = wasm.TS_malloc(inputArray.length + 4);
 440         const arrayLengthView = new Uint32Array(wasm.memory.buffer, cArrayPointer, 1);
 441         arrayLengthView[0] = inputArray.length;
 442         const arrayMemoryView = new Uint8Array(wasm.memory.buffer, cArrayPointer + 4, inputArray.length);
 443         arrayMemoryView.set(inputArray);
 444         return cArrayPointer;
 445 }
 446
 447 const encodeUint32Array = (inputArray) => {
 448         const cArrayPointer = wasm.TS_malloc((inputArray.length + 1) * 4);
 449         const arrayMemoryView = new Uint32Array(wasm.memory.buffer, cArrayPointer, inputArray.length);
 450         arrayMemoryView.set(inputArray, 1);
 451         arrayMemoryView[0] = inputArray.length;
 452         return cArrayPointer;
 453 }
 454
 455 const getArrayLength = (arrayPointer) => {
 456         const arraySizeViewer = new Uint32Array(
 457                 wasm.memory.buffer, // value
 458                 arrayPointer, // offset
 459                 1 // one int
 460         );
 461         return arraySizeViewer[0];
 462 }
 463 const decodeUint8Array = (arrayPointer, free = true) => {
 464         const arraySize = getArrayLength(arrayPointer);
 465         const actualArrayViewer = new Uint8Array(
 466                 wasm.memory.buffer, // value
 467                 arrayPointer + 4, // offset (ignoring length bytes)
 468                 arraySize // uint8 count
 469         );
 470         // Clone the contents, TODO: In the future we should wrap the Viewer in a class that
 471         // will free the underlying memory when it becomes unreachable instead of copying here.
 472         const actualArray = actualArrayViewer.slice(0, arraySize);
 473         if (free) {
 474                 wasm.TS_free(arrayPointer);
 475         }
 476         return actualArray;
 477 }
 478 const decodeUint32Array = (arrayPointer, free = true) => {
 479         const arraySize = getArrayLength(arrayPointer);
 480         const actualArrayViewer = new Uint32Array(
 481                 wasm.memory.buffer, // value
 482                 arrayPointer + 4, // offset (ignoring length bytes)
 483                 arraySize // uint32 count
 484         );
 485         // Clone the contents, TODO: In the future we should wrap the Viewer in a class that
 486         // will free the underlying memory when it becomes unreachable instead of copying here.
 487         const actualArray = actualArrayViewer.slice(0, arraySize);
 488         if (free) {
 489                 wasm.TS_free(arrayPointer);
 490         }
 491         return actualArray;
 492 }
 493
 494 const encodeString = (string) => {
 495         // make malloc count divisible by 4
 496         const memoryNeed = nextMultipleOfFour(string.length + 1);
 497         const stringPointer = wasm.TS_malloc(memoryNeed);
 498         const stringMemoryView = new Uint8Array(
 499                 wasm.memory.buffer, // value
 500                 stringPointer, // offset
 501                 string.length + 1 // length
 502         );
 503         for (let i = 0; i < string.length; i++) {
 504                 stringMemoryView[i] = string.charCodeAt(i);
 505         }
 506         stringMemoryView[string.length] = 0;
 507         return stringPointer;
 508 }
 509
 510 const decodeString = (stringPointer, free = true) => {
 511         const memoryView = new Uint8Array(wasm.memory.buffer, stringPointer);
 512         let cursor = 0;
 513         let result = '';
 514
 515         while (memoryView[cursor] !== 0) {
 516                 result += String.fromCharCode(memoryView[cursor]);
 517                 cursor++;
 518         }
 519
 520         if (free) {
 521                 wasm.wasm_free(stringPointer);
 522         }
 523
 524         return result;
 525 };
 526 """
 527
 528     def init_str(self):
 529         return ""
 530
 531     def var_decl_statement(self, ty_string, var_name, statement):
 532         return "const " + var_name + ": " + ty_string + " = " + statement
 533
 534     def get_ptr(self, var):
 535         return "CommonBase.get_ptr_of(" + var + ")"
 536     def set_null_skip_free(self, var):
 537         return "CommonBase.set_null_skip_free(" + var + ");"
 538
 539     def add_ref(self, holder, referent):
 540         return "CommonBase.add_ref_from(" + holder + ", " + referent + ")"
 541
 542     def obj_defined(self, struct_names, folder):
 543         with open(self.outdir + "/index.mts", 'a') as index:
 544             index.write(f"export * from './{folder}/{struct_names[0]}.mjs';\n")
 545         with open(self.outdir + "/imports.mts.part", 'a') as imports:
 546             imports.write(f"import {{ {', '.join(struct_names)} }} from '../{folder}/{struct_names[0]}.mjs';\n")
 547
 548     def native_c_unitary_enum_map(self, struct_name, variants, enum_doc_comment):
 549         out_c = "static inline LDK" + struct_name + " LDK" + struct_name + "_from_js(int32_t ord) {\n"
 550         out_c = out_c + "\tswitch (ord) {\n"
 551         ord_v = 0
 552
 553         out_typescript_enum_fields = ""
 554
 555         for var, var_docs in variants:
 556             out_c = out_c + "\t\tcase %d: return %s;\n" % (ord_v, var)
 557             ord_v = ord_v + 1
 558             if var_docs is not None:
 559                 out_typescript_enum_fields += f"/**\n * {var_docs}\n */\n"
 560             out_typescript_enum_fields += f"{var},\n\t\t\t\t"
 561         out_c = out_c + "\t}\n"
 562         out_c = out_c + "\tabort();\n"
 563         out_c = out_c + "}\n"
 564
 565         out_c = out_c + "static inline int32_t LDK" + struct_name + "_to_js(LDK" + struct_name + " val) {\n"
 566         out_c = out_c + "\tswitch (val) {\n"
 567         ord_v = 0
 568         for var, _ in variants:
 569             out_c = out_c + "\t\tcase " + var + ": return %d;\n" % ord_v
 570             ord_v = ord_v + 1
 571         out_c = out_c + "\t\tdefault: abort();\n"
 572         out_c = out_c + "\t}\n"
 573         out_c = out_c + "}\n"
 574
 575         out_typescript = f"""
 576             export enum {struct_name} {{
 577                 {out_typescript_enum_fields}
 578             }}
 579 """
 580         out_typescript_enum = f"export {{ {struct_name} }} from \"../bindings.mjs\";"
 581         self.obj_defined([struct_name], "enums")
 582         return (out_c, out_typescript_enum, out_typescript)
 583
 584     def c_unitary_enum_to_native_call(self, ty_info):
 585         return (ty_info.rust_obj + "_to_js(", ")")
 586     def native_unitary_enum_to_c_call(self, ty_info):
 587         return (ty_info.rust_obj + "_from_js(", ")")
 588
 589     def c_complex_enum_pass_ty(self, struct_name):
 590         return "uint32_t"
 591
 592     def c_constr_native_complex_enum(self, struct_name, variant, c_params):
 593         ret = "0 /* " + struct_name + " - " + variant + " */"
 594         for param in c_params:
 595             ret = ret + "; (void) " + param
 596         return ret
 597
 598     def native_c_map_trait(self, struct_name, field_var_conversions, flattened_field_var_conversions, field_function_lines, trait_doc_comment):
 599         out_typescript_bindings = "\n\n\n// OUT_TYPESCRIPT_BINDINGS :: MAP_TRAIT :: START\n\n"
 600
 601         constructor_arguments = ""
 602         super_instantiator = ""
 603         pointer_to_adder = ""
 604         impl_constructor_arguments = ""
 605         for var in flattened_field_var_conversions:
 606             if isinstance(var, ConvInfo):
 607                 constructor_arguments += f", {first_to_lower(var.arg_name)}?: {var.java_hu_ty}"
 608                 impl_constructor_arguments += f", {var.arg_name}: {var.java_hu_ty}"
 609                 if var.from_hu_conv is not None:
 610                     super_instantiator += ", " + var.from_hu_conv[0]
 611                     if var.from_hu_conv[1] != "":
 612                         pointer_to_adder += var.from_hu_conv[1] + ";\n"
 613                 else:
 614                     super_instantiator += ", " + first_to_lower(var.arg_name)
 615             else:
 616                 constructor_arguments += f", {first_to_lower(var[1])}?: bindings.{var[0]}"
 617                 super_instantiator += ", " + first_to_lower(var[1])
 618                 pointer_to_adder += "this.ptrs_to.push(" + first_to_lower(var[1]) + ");\n"
 619                 impl_constructor_arguments += f", {first_to_lower(var[1])}_impl: {var[0].replace('LDK', '')}.{var[0].replace('LDK', '')}Interface"
 620
 621         # BUILD INTERFACE METHODS
 622         out_java_interface = ""
 623         out_interface_implementation_overrides = ""
 624         java_methods = []
 625         for fn_line in field_function_lines:
 626             java_method_descriptor = ""
 627             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 628                 out_java_interface += fn_line.fn_name + "("
 629                 out_interface_implementation_overrides += f"{fn_line.fn_name} ("
 630
 631                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 632                     if idx >= 1:
 633                         out_java_interface += ", "
 634                         out_interface_implementation_overrides += ", "
 635                     out_java_interface += f"{arg_conv_info.arg_name}: {arg_conv_info.java_hu_ty}"
 636                     out_interface_implementation_overrides += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
 637                     java_method_descriptor += arg_conv_info.java_fn_ty_arg
 638                 out_java_interface += f"): {fn_line.ret_ty_info.java_hu_ty};\n\t\t\t\t"
 639                 java_method_descriptor += ")" + fn_line.ret_ty_info.java_fn_ty_arg
 640                 java_methods.append((fn_line.fn_name, java_method_descriptor))
 641
 642                 out_interface_implementation_overrides += f"): {fn_line.ret_ty_info.java_ty} {{\n"
 643
 644                 interface_method_override_inset = "\t\t\t\t\t\t"
 645                 interface_implementation_inset = "\t\t\t\t\t\t\t"
 646                 for arg_info in fn_line.args_ty:
 647                     if arg_info.to_hu_conv is not None:
 648                         out_interface_implementation_overrides += interface_implementation_inset + arg_info.to_hu_conv.replace("\n", "\n\t\t\t\t") + "\n"
 649
 650                 if fn_line.ret_ty_info.java_ty != "void":
 651                     out_interface_implementation_overrides += interface_implementation_inset + fn_line.ret_ty_info.java_hu_ty + " ret = arg." + fn_line.fn_name + "("
 652                 else:
 653                     out_interface_implementation_overrides += f"{interface_implementation_inset}arg." + fn_line.fn_name + "("
 654
 655                 for idx, arg_info in enumerate(fn_line.args_ty):
 656                     if idx != 0:
 657                         out_interface_implementation_overrides += ", "
 658                     if arg_info.to_hu_conv_name is not None:
 659                         out_interface_implementation_overrides += arg_info.to_hu_conv_name
 660                     else:
 661                         out_interface_implementation_overrides += arg_info.arg_name
 662
 663                 out_interface_implementation_overrides += ");\n"
 664                 if fn_line.ret_ty_info.java_ty != "void":
 665                     if fn_line.ret_ty_info.from_hu_conv is not None:
 666                         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"
 667                         if fn_line.ret_ty_info.from_hu_conv[1] != "":
 668                             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"
 669                         #if fn_line.ret_ty_info.rust_obj in result_types:
 670                         # XXX: We need to handle this in conversion logic so that its cross-language!
 671                         # Avoid double-free by breaking the result - we should learn to clone these and then we can be safe instead
 672                         #    out_interface_implementation_overrides = out_interface_implementation_overrides + "\t\t\t\tret.ptr = 0;\n"
 673                         out_interface_implementation_overrides = out_interface_implementation_overrides + "\t\t\t\treturn result;\n"
 674                     else:
 675                         out_interface_implementation_overrides = out_interface_implementation_overrides + "\t\t\t\treturn ret;\n"
 676                 out_interface_implementation_overrides += f"{interface_method_override_inset}}},\n\n{interface_method_override_inset}"
 677
 678         trait_constructor_arguments = ""
 679         for var in field_var_conversions:
 680             if isinstance(var, ConvInfo):
 681                 trait_constructor_arguments += ", " + var.arg_name
 682             else:
 683                 trait_constructor_arguments += ", " + var[1] + ".new_impl(" + var[1] + "_impl"
 684                 for suparg in var[2]:
 685                     if isinstance(suparg, ConvInfo):
 686                         trait_constructor_arguments += ", " + suparg.arg_name
 687                     else:
 688                         trait_constructor_arguments += ", " + suparg[1]
 689                 trait_constructor_arguments += ").bindings_instance"
 690                 for suparg in var[2]:
 691                     if isinstance(suparg, ConvInfo):
 692                         trait_constructor_arguments += ", " + suparg.arg_name
 693                     else:
 694                         trait_constructor_arguments += ", " + suparg[1]
 695
 696         out_typescript_human = f"""
 697 {self.hu_struct_file_prefix}
 698
 699 {struct_name.replace("LDK","")} extends CommonBase {{
 700
 701         bindings_instance?: bindings.{struct_name};
 702
 703         constructor(ptr?: number, arg?: bindings.{struct_name}{constructor_arguments}) {{
 704                 if (Number.isFinite(ptr)) {{
 705                         super(ptr, bindings.{struct_name.replace("LDK","")}_free);
 706                         this.bindings_instance = null;
 707                 }} else {{
 708                         // TODO: private constructor instantiation
 709                         super(bindings.{struct_name}_new(arg{super_instantiator}));
 710                         this.ptrs_to.push(arg);
 711                         {pointer_to_adder}
 712                 }}
 713         }}
 714
 715         static new_impl(arg: {struct_name.replace("LDK", "")}Interface{impl_constructor_arguments}): {struct_name.replace("LDK", "")} {{
 716                 const impl_holder: {struct_name}Holder = new {struct_name}Holder();
 717                 let structImplementation = <bindings.{struct_name}>{{
 718                         // todo: in-line interface filling
 719                         {out_interface_implementation_overrides}
 720                 }};
 721                 impl_holder.held = new {struct_name.replace("LDK", "")} (null, structImplementation{trait_constructor_arguments});
 722         }}
 723
 724         export interface {struct_name.replace("LDK", "")}Interface {{
 725                 {out_java_interface}
 726         }}
 727
 728         class {struct_name}Holder {{
 729                 held: {struct_name.replace("LDK", "")};
 730         }}
 731 """
 732
 733         out_typescript_bindings += "\t\texport interface " + struct_name + " {\n"
 734         java_meths = []
 735         for fn_line in field_function_lines:
 736             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 737                 out_typescript_bindings += f"\t\t\t{fn_line.fn_name} ("
 738
 739                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 740                     if idx >= 1:
 741                         out_typescript_bindings = out_typescript_bindings + ", "
 742                     out_typescript_bindings += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
 743
 744                 out_typescript_bindings += f"): {fn_line.ret_ty_info.java_ty};\n"
 745
 746         out_typescript_bindings = out_typescript_bindings + "\t\t}\n\n"
 747
 748         out_typescript_bindings += f"\t\texport function {struct_name}_new(impl: {struct_name}"
 749         for var in flattened_field_var_conversions:
 750             if isinstance(var, ConvInfo):
 751                 out_typescript_bindings += f", {var.arg_name}: {var.java_ty}"
 752             else:
 753                 out_typescript_bindings += f", {var[1]}: {var[0]}"
 754
 755         out_typescript_bindings += f"""): number {{
 756             throw new Error('unimplemented'); // TODO: bind to WASM
 757         }}
 758 """
 759
 760         out_typescript_bindings += '\n// OUT_TYPESCRIPT_BINDINGS :: MAP_TRAIT :: END\n\n\n'
 761
 762         # Now that we've written out our java code (and created java_meths), generate C
 763         out_c = "typedef struct " + struct_name + "_JCalls {\n"
 764         out_c = out_c + "\tatomic_size_t refcnt;\n"
 765         for var in flattened_field_var_conversions:
 766             if isinstance(var, ConvInfo):
 767                 # We're a regular ol' field
 768                 pass
 769             else:
 770                 # We're a supertrait
 771                 out_c = out_c + "\t" + var[0] + "_JCalls* " + var[1] + ";\n"
 772         for fn in field_function_lines:
 773             if fn.fn_name != "free" and fn.fn_name != "cloned":
 774                 out_c = out_c + "\tuint32_t " + fn.fn_name + "_meth;\n"
 775         out_c = out_c + "} " + struct_name + "_JCalls;\n"
 776
 777         for fn_line in field_function_lines:
 778             if fn_line.fn_name == "free":
 779                 out_c = out_c + "static void " + struct_name + "_JCalls_free(void* this_arg) {\n"
 780                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 781                 out_c = out_c + "\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n"
 782                 for fn in field_function_lines:
 783                     if fn.fn_name != "free" and fn.fn_name != "cloned":
 784                         out_c = out_c + "\t\tjs_free_function_ptr(j_calls->" + fn.fn_name + "_meth);\n"
 785                 out_c = out_c + "\t\tFREE(j_calls);\n"
 786                 out_c = out_c + "\t}\n}\n"
 787
 788         for idx, fn_line in enumerate(field_function_lines):
 789             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 790                 assert fn_line.ret_ty_info.ty_info.get_full_rust_ty()[1] == ""
 791                 out_c = out_c + fn_line.ret_ty_info.ty_info.get_full_rust_ty()[0] + " " + fn_line.fn_name + "_" + struct_name + "_jcall("
 792                 if fn_line.self_is_const:
 793                     out_c = out_c + "const void* this_arg"
 794                 else:
 795                     out_c = out_c + "void* this_arg"
 796
 797                 for idx, arg in enumerate(fn_line.args_ty):
 798                     out_c = out_c + ", " + arg.ty_info.get_full_rust_ty()[0] + " " + arg.arg_name + arg.ty_info.get_full_rust_ty()[1]
 799
 800                 out_c = out_c + ") {\n"
 801                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 802
 803                 for arg_info in fn_line.args_ty:
 804                     if arg_info.ret_conv is not None:
 805                         out_c = out_c + "\t" + arg_info.ret_conv[0].replace('\n', '\n\t')
 806                         out_c = out_c + arg_info.arg_name
 807                         out_c = out_c + arg_info.ret_conv[1].replace('\n', '\n\t') + "\n"
 808
 809                 if fn_line.ret_ty_info.c_ty.endswith("Array"):
 810                     out_c += "\t" + fn_line.ret_ty_info.c_ty + " ret = (" + fn_line.ret_ty_info.c_ty + ")"
 811                     out_c += "js_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->" + fn_line.fn_name + "_meth"
 812                 elif fn_line.ret_ty_info.java_ty == "void":
 813                     out_c = out_c + "\tjs_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->" + fn_line.fn_name + "_meth"
 814                 elif fn_line.ret_ty_info.java_ty == "String":
 815                     out_c = out_c + "\tjstring ret = (jstring)js_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->" + fn_line.fn_name + "_meth"
 816                 elif not fn_line.ret_ty_info.passed_as_ptr:
 817                     out_c = out_c + "\treturn js_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->" + fn_line.fn_name + "_meth"
 818                 else:
 819                     out_c = out_c + "\tuint32_t ret = js_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->" + fn_line.fn_name + "_meth"
 820
 821                 for idx, arg_info in enumerate(fn_line.args_ty):
 822                     if arg_info.ret_conv is not None:
 823                         out_c = out_c + ", (uint32_t)" + arg_info.ret_conv_name
 824                     else:
 825                         out_c = out_c + ", (uint32_t)" + arg_info.arg_name
 826                 out_c = out_c + ");\n"
 827                 if fn_line.ret_ty_info.arg_conv is not None:
 828                     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"
 829
 830                 out_c = out_c + "}\n"
 831
 832         # Write out a clone function whether we need one or not, as we use them in moving to rust
 833         out_c = out_c + "static void " + struct_name + "_JCalls_cloned(" + struct_name + "* new_obj) {\n"
 834         out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) new_obj->this_arg;\n"
 835         out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n"
 836         for var in field_var_conversions:
 837             if not isinstance(var, ConvInfo):
 838                 out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->" + var[1] + "->refcnt, 1, memory_order_release);\n"
 839         out_c = out_c + "}\n"
 840
 841         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_init (/*TODO: JS Object Reference */void* o"
 842         for var in flattened_field_var_conversions:
 843             if isinstance(var, ConvInfo):
 844                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 845             else:
 846                 out_c = out_c + ", /*TODO: JS Object Reference */void* " + var[1]
 847         out_c = out_c + ") {\n"
 848
 849         out_c = out_c + "\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n"
 850         out_c = out_c + "\tatomic_init(&calls->refcnt, 1);\n"
 851         out_c = out_c + "\t//TODO: Assign calls->o from o\n"
 852
 853         for (fn_name, java_meth_descr) in java_meths:
 854             if fn_name != "free" and fn_name != "cloned":
 855                 out_c = out_c + "\tcalls->" + fn_name + "_meth = (*env)->GetMethodID(env, c, \"" + fn_name + "\", \"" + java_meth_descr + "\");\n"
 856                 out_c = out_c + "\tCHECK(calls->" + fn_name + "_meth != NULL);\n"
 857
 858         for var in flattened_field_var_conversions:
 859             if isinstance(var, ConvInfo) and var.arg_conv is not None:
 860                 out_c = out_c + "\n\t" + var.arg_conv.replace("\n", "\n\t") +"\n"
 861         out_c = out_c + "\n\t" + struct_name + " ret = {\n"
 862         out_c = out_c + "\t\t.this_arg = (void*) calls,\n"
 863         for fn_line in field_function_lines:
 864             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 865                 out_c = out_c + "\t\t." + fn_line.fn_name + " = " + fn_line.fn_name + "_" + struct_name + "_jcall,\n"
 866             elif fn_line.fn_name == "free":
 867                 out_c = out_c + "\t\t.free = " + struct_name + "_JCalls_free,\n"
 868             else:
 869                 out_c = out_c + "\t\t.cloned = " + struct_name + "_JCalls_cloned,\n"
 870         for var in field_var_conversions:
 871             if isinstance(var, ConvInfo):
 872                 if var.arg_conv_name is not None:
 873                     out_c = out_c + "\t\t." + var.arg_name + " = " + var.arg_conv_name + ",\n"
 874                     out_c = out_c + "\t\t.set_" + var.arg_name + " = NULL,\n"
 875                 else:
 876                     out_c = out_c + "\t\t." + var.var_name + " = " + var.var_name + ",\n"
 877                     out_c = out_c + "\t\t.set_" + var.var_name + " = NULL,\n"
 878             else:
 879                 out_c += "\t\t." + var[1] + " = " + var[0] + "_init(" + var[1]
 880                 for suparg in var[2]:
 881                     if isinstance(suparg, ConvInfo):
 882                         out_c += ", " + suparg.arg_name
 883                     else:
 884                         out_c += ", " + suparg[1]
 885                 out_c += "),\n"
 886         out_c = out_c + "\t};\n"
 887         for var in flattened_field_var_conversions:
 888             if not isinstance(var, ConvInfo):
 889                 out_c = out_c + "\tcalls->" + var[1] + " = ret." + var[1] + ".this_arg;\n"
 890         out_c = out_c + "\treturn ret;\n"
 891         out_c = out_c + "}\n"
 892
 893         out_c = out_c + self.c_fn_ty_pfx + "long " + self.c_fn_name_define_pfx(struct_name + "_new", True) + "/*TODO: JS Object Reference */void* o"
 894         for var in flattened_field_var_conversions:
 895             if isinstance(var, ConvInfo):
 896                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 897             else:
 898                 out_c = out_c + ", /*TODO: JS Object Reference */ void* " + var[1]
 899         out_c = out_c + ") {\n"
 900         out_c = out_c + "\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n"
 901         out_c = out_c + "\t*res_ptr = " + struct_name + "_init(o"
 902         for var in flattened_field_var_conversions:
 903             if isinstance(var, ConvInfo):
 904                 out_c = out_c + ", " + var.arg_name
 905             else:
 906                 out_c = out_c + ", " + var[1]
 907         out_c = out_c + ");\n"
 908         out_c = out_c + "\treturn (long)res_ptr;\n"
 909         out_c = out_c + "}\n"
 910
 911         return (out_typescript_bindings, out_typescript_human, out_c)
 912
 913     def trait_struct_inc_refcnt(self, ty_info):
 914         return ""
 915
 916     def map_complex_enum(self, struct_name, variant_list, camel_to_snake, enum_doc_comment):
 917         bindings_type = struct_name.replace("LDK", "")
 918         java_hu_type = struct_name.replace("LDK", "").replace("COption", "Option")
 919
 920         out_java_enum = ""
 921         out_java = ""
 922         out_c = ""
 923
 924         out_java_enum += (self.hu_struct_file_prefix)
 925
 926         java_hu_class = ""
 927         java_hu_class += "export class " + java_hu_type + " extends CommonBase {\n"
 928         java_hu_class += "\tprotected constructor(_dummy: object, ptr: number) { super(ptr, bindings." + bindings_type + "_free); }\n"
 929         java_hu_class += "\t/* @internal */\n"
 930         java_hu_class += f"\tpublic static constr_from_ptr(ptr: number): {java_hu_type} {{\n"
 931         java_hu_class += f"\t\tconst raw_val: bindings.{struct_name} = bindings." + struct_name + "_ref_from_ptr(ptr);\n"
 932         java_hu_subclasses = ""
 933
 934         out_java += "\texport class " + struct_name + " {\n"
 935         out_java += "\t\tprotected constructor() {}\n"
 936         java_subclasses = ""
 937         for var in variant_list:
 938             java_subclasses += "\texport class " + struct_name + "_" + var.var_name + " extends " + struct_name + " {\n"
 939             java_hu_subclasses = java_hu_subclasses + "export class " + java_hu_type + "_" + var.var_name + " extends " + java_hu_type + " {\n"
 940             java_hu_class += "\t\tif (raw_val instanceof bindings." + struct_name + "_" + var.var_name + ") {\n"
 941             java_hu_class += "\t\t\treturn new " + java_hu_type + "_" + var.var_name + "(ptr, raw_val);\n"
 942             init_meth_params = ""
 943             hu_conv_body = ""
 944             for idx, (field_ty, field_docs) in enumerate(var.fields):
 945                 java_hu_subclasses = java_hu_subclasses + "\tpublic " + field_ty.arg_name + f": {field_ty.java_hu_ty};\n"
 946                 if field_ty.to_hu_conv is not None:
 947                     hu_conv_body = hu_conv_body + "\t\tconst " + field_ty.arg_name + f": {field_ty.java_ty} = obj." + field_ty.arg_name + ";\n"
 948                     hu_conv_body = hu_conv_body + "\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
 949                     hu_conv_body = hu_conv_body + "\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
 950                 else:
 951                     hu_conv_body = hu_conv_body + "\t\tthis." + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
 952                 if idx > 0:
 953                     init_meth_params += ", "
 954                 init_meth_params += "public " + field_ty.arg_name + ": " + field_ty.java_ty
 955             java_subclasses += "\t\tconstructor(" + init_meth_params + ") { super(); }\n"
 956             java_subclasses += "\t}\n"
 957             java_hu_class += "\t\t}\n"
 958             java_hu_subclasses += "\t/* @internal */\n"
 959             java_hu_subclasses += "\tpublic constructor(ptr: number, obj: bindings." + struct_name + "_" + var.var_name + ") {\n\t\tsuper(null, ptr);\n"
 960             java_hu_subclasses = java_hu_subclasses + hu_conv_body
 961             java_hu_subclasses = java_hu_subclasses + "\t}\n}\n"
 962         out_java += ("\t}\n")
 963         out_java += java_subclasses
 964         java_hu_class += "\t\tthrow new Error('oops, this should be unreachable'); // Unreachable without extending the (internal) bindings interface\n\t}\n\n"
 965         out_java += self.fn_call_body(struct_name + "_ref_from_ptr", "uint32_t", "number", "ptr: number", "ptr")
 966
 967         out_c += (self.c_fn_ty_pfx + self.c_complex_enum_pass_ty(struct_name) + self.c_fn_name_define_pfx(struct_name + "_ref_from_ptr", True) + self.ptr_c_ty + " ptr) {\n")
 968         out_c += ("\t" + struct_name + " *obj = (" + struct_name + "*)(ptr & ~1);\n")
 969         out_c += ("\tswitch(obj->tag) {\n")
 970         for var in variant_list:
 971             out_c += ("\t\tcase " + struct_name + "_" + var.var_name + ": {\n")
 972             c_params = []
 973             for idx, (field_map, _) in enumerate(var.fields):
 974                 if field_map.ret_conv is not None:
 975                     out_c += ("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
 976                     if var.tuple_variant:
 977                         out_c += "obj->" + camel_to_snake(var.var_name)
 978                     else:
 979                         out_c += "obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name
 980                     out_c += (field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
 981                     c_params.append(field_map.ret_conv_name)
 982                 else:
 983                     if var.tuple_variant:
 984                         c_params.append("obj->" + camel_to_snake(var.var_name))
 985                     else:
 986                         c_params.append("obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name)
 987             out_c += ("\t\t\treturn " + self.c_constr_native_complex_enum(struct_name, var.var_name, c_params) + ";\n")
 988             out_c += ("\t\t}\n")
 989         out_c += ("\t\tdefault: abort();\n")
 990         out_c += ("\t}\n}\n")
 991         out_java_enum += java_hu_class
 992         self.struct_file_suffixes[java_hu_type] = java_hu_subclasses
 993         self.obj_defined([java_hu_type], "structs")
 994         return (out_java, out_java_enum, out_c)
 995
 996     def map_opaque_struct(self, struct_name, struct_doc_comment):
 997         implementations = ""
 998         method_header = ""
 999         if struct_name.startswith("LDKLocked"):
1000             return "NOT IMPLEMENTED"
1001
1002         hu_name = struct_name.replace("LDKC2Tuple", "TwoTuple").replace("LDKC3Tuple", "ThreeTuple").replace("LDK", "")
1003         out_opaque_struct_human = f"""{self.hu_struct_file_prefix}
1004
1005 export class {hu_name} extends CommonBase {implementations}{{
1006         /* @internal */
1007         public constructor(_dummy: object, ptr: number) {{
1008                 super(ptr, bindings.{struct_name.replace("LDK","")}_free);
1009         }}
1010
1011 """
1012         self.obj_defined([hu_name], "structs")
1013         return out_opaque_struct_human
1014
1015     def map_tuple(self, struct_name):
1016         return self.map_opaque_struct(struct_name, "A Tuple")
1017
1018     def map_result(self, struct_name, res_map, err_map):
1019         human_ty = struct_name.replace("LDKCResult", "Result")
1020
1021         suffixes = f"export class {human_ty}_OK extends {human_ty} {{\n"
1022         if res_map.java_hu_ty != "void":
1023             suffixes += "\tpublic res: " + res_map.java_hu_ty + ";\n"
1024         suffixes += f"""
1025         /* @internal */
1026         public constructor(_dummy: object, ptr: number) {{
1027                 super(_dummy, ptr);
1028 """
1029         if res_map.java_hu_ty == "void":
1030             pass
1031         elif res_map.to_hu_conv is not None:
1032             suffixes += "\t\tconst res: " + res_map.java_ty + " = bindings." + struct_name.replace("LDK", "") + "_get_ok(ptr);\n"
1033             suffixes += "\t\t" + res_map.to_hu_conv.replace("\n", "\n\t\t")
1034             suffixes += "\n\t\tthis.res = " + res_map.to_hu_conv_name + ";\n"
1035         else:
1036             suffixes += "\t\tthis.res = bindings." + struct_name.replace("LDK", "") + "_get_ok(ptr);\n"
1037         suffixes += "\t}\n}\n"
1038
1039         suffixes += f"export class {human_ty}_Err extends {human_ty} {{\n"
1040         if err_map.java_hu_ty != "void":
1041             suffixes += "\tpublic err: " + err_map.java_hu_ty + ";\n"
1042         suffixes += f"""
1043         /* @internal */
1044         public constructor(_dummy: object, ptr: number) {{
1045                 super(_dummy, ptr);
1046 """
1047         if err_map.java_hu_ty == "void":
1048             pass
1049         elif err_map.to_hu_conv is not None:
1050             suffixes += "\t\tconst err: " + err_map.java_ty + " = bindings." + struct_name.replace("LDK", "") + "_get_err(ptr);\n"
1051             suffixes += "\t\t" + err_map.to_hu_conv.replace("\n", "\n\t\t")
1052             suffixes += "\n\t\tthis.err = " + err_map.to_hu_conv_name + ";\n"
1053         else:
1054             suffixes += "\t\tthis.err = bindings." + struct_name.replace("LDK", "") + "_get_err(ptr);\n"
1055         suffixes += "\t}\n}"
1056
1057         self.struct_file_suffixes[human_ty] = suffixes
1058         self.obj_defined([human_ty], "structs")
1059
1060         return f"""{self.hu_struct_file_prefix}
1061
1062 export class {human_ty} extends CommonBase {{
1063         protected constructor(_dummy: object, ptr: number) {{
1064                 super(ptr, bindings.{struct_name.replace("LDK","")}_free);
1065         }}
1066         /* @internal */
1067         public static constr_from_ptr(ptr: number): {human_ty} {{
1068                 if (bindings.{struct_name.replace("LDK", "")}_is_ok(ptr)) {{
1069                         return new {human_ty}_OK(null, ptr);
1070                 }} else {{
1071                         return new {human_ty}_Err(null, ptr);
1072                 }}
1073         }}
1074 """
1075
1076     def fn_call_body(self, method_name, return_c_ty, return_java_ty, method_argument_string, native_call_argument_string):
1077         has_return_value = return_c_ty != 'void'
1078         needs_decoding = return_c_ty in self.wasm_decoding_map
1079         return_statement = 'return nativeResponseValue;'
1080         if not has_return_value:
1081             return_statement = '// debug statements here'
1082         elif needs_decoding:
1083             converter = self.wasm_decoding_map[return_c_ty]
1084             return_statement = f"return {converter}(nativeResponseValue);"
1085
1086         return f"""\texport function {method_name}({method_argument_string}): {return_java_ty} {{
1087                 if(!isWasmInitialized) {{
1088                         throw new Error("initializeWasm() must be awaited first!");
1089                 }}
1090                 const nativeResponseValue = wasm.TS_{method_name}({native_call_argument_string});
1091                 {return_statement}
1092         }}
1093 """
1094     def map_function(self, argument_types, c_call_string, method_name, meth_n, return_type_info, struct_meth, default_constructor_args, takes_self, takes_self_as_ref, args_known, type_mapping_generator, doc_comment):
1095         out_java = ""
1096         out_c = ""
1097         out_java_struct = None
1098
1099         out_java += ("\t")
1100         out_c += (self.c_fn_ty_pfx)
1101         out_c += (return_type_info.c_ty)
1102         out_java += (return_type_info.java_ty)
1103         if return_type_info.ret_conv is not None:
1104             ret_conv_pfx, ret_conv_sfx = return_type_info.ret_conv
1105         out_java += (" " + method_name + "(")
1106         out_c += (" "  + self.c_fn_name_define_pfx(method_name, True))
1107
1108         method_argument_string = ""
1109         native_call_argument_string = ""
1110         for idx, arg_conv_info in enumerate(argument_types):
1111             if idx != 0:
1112                 method_argument_string += (", ")
1113                 native_call_argument_string += ', '
1114                 out_c += (", ")
1115             if arg_conv_info.c_ty != "void":
1116                 out_c += (arg_conv_info.c_ty + " " + arg_conv_info.arg_name)
1117                 needs_encoding = arg_conv_info.c_ty in self.wasm_encoding_map
1118                 native_argument = arg_conv_info.arg_name
1119                 if needs_encoding:
1120                     converter = self.wasm_encoding_map[arg_conv_info.c_ty]
1121                     native_argument = f"{converter}({arg_conv_info.arg_name})"
1122                 method_argument_string += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
1123                 native_call_argument_string += native_argument
1124         out_java = self.fn_call_body(method_name, return_type_info.c_ty, return_type_info.java_ty, method_argument_string, native_call_argument_string)
1125
1126         out_java_struct = ""
1127         if not args_known:
1128             out_java_struct += ("\t// Skipped " + method_name + "\n")
1129         else:
1130             if not takes_self:
1131                 out_java_struct += (
1132                         "\tpublic static constructor_" + meth_n + "(")
1133             else:
1134                 out_java_struct += ("\tpublic " + meth_n + "(")
1135             for idx, arg in enumerate(argument_types):
1136                 if idx != 0:
1137                     if not takes_self or idx > 1:
1138                         out_java_struct += (", ")
1139                 elif takes_self:
1140                     continue
1141                 if arg.java_ty != "void":
1142                     if arg.arg_name in default_constructor_args:
1143                         for explode_idx, explode_arg in enumerate(default_constructor_args[arg.arg_name]):
1144                             if explode_idx != 0:
1145                                 out_java_struct += (", ")
1146                             out_java_struct += arg.arg_name + "_" + explode_arg.arg_name + ": " + explode_arg.java_hu_ty
1147                     else:
1148                         out_java_struct += arg.arg_name + ": " + arg.java_hu_ty
1149
1150         out_c += (") {\n")
1151         if out_java_struct is not None:
1152             out_java_struct += "): " + return_type_info.java_hu_ty + " {\n"
1153         for info in argument_types:
1154             if info.arg_conv is not None:
1155                 out_c += ("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
1156         if return_type_info.ret_conv is not None:
1157             out_c += ("\t" + ret_conv_pfx.replace('\n', '\n\t'))
1158         elif return_type_info.c_ty != "void":
1159             out_c += ("\t" + return_type_info.c_ty + " ret_val = ")
1160         else:
1161             out_c += ("\t")
1162         if c_call_string is None:
1163             out_c += (method_name + "(")
1164         else:
1165             out_c += (c_call_string)
1166         for idx, info in enumerate(argument_types):
1167             if info.arg_conv_name is not None:
1168                 if idx != 0:
1169                     out_c += (", ")
1170                 elif c_call_string is not None:
1171                     continue
1172                 out_c += (info.arg_conv_name)
1173         out_c += (")")
1174         if return_type_info.ret_conv is not None:
1175             out_c += (ret_conv_sfx.replace('\n', '\n\t'))
1176         else:
1177             out_c += (";")
1178         for info in argument_types:
1179             if info.arg_conv_cleanup is not None:
1180                 out_c += ("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
1181         if return_type_info.ret_conv is not None:
1182             out_c += ("\n\treturn " + return_type_info.ret_conv_name + ";")
1183         elif return_type_info.c_ty != "void":
1184             out_c += ("\n\treturn ret_val;")
1185         out_c += ("\n}\n\n")
1186
1187         if args_known:
1188             out_java_struct += ("\t\t")
1189             if return_type_info.java_ty != "void":
1190                 out_java_struct += "const ret: " + return_type_info.java_ty + " = "
1191             out_java_struct += ("bindings." + method_name + "(")
1192             for idx, info in enumerate(argument_types):
1193                 if idx != 0:
1194                     out_java_struct += (", ")
1195                 if idx == 0 and takes_self:
1196                     out_java_struct += ("this.ptr")
1197                 elif info.arg_name in default_constructor_args:
1198                     out_java_struct += ("bindings." + info.java_hu_ty + "_new(")
1199                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
1200                         if explode_idx != 0:
1201                             out_java_struct += (", ")
1202                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1203                         if explode_arg.from_hu_conv is not None:
1204                             out_java_struct += (
1205                                 explode_arg.from_hu_conv[0].replace(explode_arg.arg_name, expl_arg_name))
1206                         else:
1207                             out_java_struct += (expl_arg_name)
1208                     out_java_struct += (")")
1209                 elif info.from_hu_conv is not None:
1210                     out_java_struct += (info.from_hu_conv[0])
1211                 else:
1212                     out_java_struct += (info.arg_name)
1213             out_java_struct += (");\n")
1214             if return_type_info.to_hu_conv is not None:
1215                 if not takes_self:
1216                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t").replace("this",
1217                                                                                                              return_type_info.to_hu_conv_name) + "\n")
1218                 else:
1219                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t") + "\n")
1220
1221             for idx, info in enumerate(argument_types):
1222                 if idx == 0 and takes_self:
1223                     pass
1224                 elif info.arg_name in default_constructor_args:
1225                     for explode_arg in default_constructor_args[info.arg_name]:
1226                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1227                         if explode_arg.from_hu_conv is not None and return_type_info.to_hu_conv_name:
1228                             out_java_struct += ("\t\t" + explode_arg.from_hu_conv[1].replace(explode_arg.arg_name,
1229                                                                                              expl_arg_name).replace(
1230                                 "this", return_type_info.to_hu_conv_name) + ";\n")
1231                 elif info.from_hu_conv is not None and info.from_hu_conv[1] != "":
1232                     if not takes_self and return_type_info.to_hu_conv_name is not None:
1233                         out_java_struct += (
1234                                 "\t\t" + info.from_hu_conv[1].replace("this", return_type_info.to_hu_conv_name).replace("\n", "\n\t\t") + ";\n")
1235                     else:
1236                         out_java_struct += ("\t\t" + info.from_hu_conv[1].replace("\n", "\n\t\t") + ";\n")
1237
1238             if return_type_info.to_hu_conv_name is not None:
1239                 out_java_struct += ("\t\treturn " + return_type_info.to_hu_conv_name + ";\n")
1240             elif return_type_info.java_ty != "void" and return_type_info.rust_obj != "LDK" + struct_meth:
1241                 out_java_struct += ("\t\treturn ret;\n")
1242             out_java_struct += ("\t}\n\n")
1243
1244         return (out_java, out_c, out_java_struct)
1245
1246     def cleanup(self):
1247         for struct in self.struct_file_suffixes:
1248             with open(self.outdir + "/structs/" + struct + self.file_ext, "a") as src:
1249                 src.write(self.struct_file_suffixes[struct])