_ 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.function_ptr_counter = 0
  18         self.function_ptrs = {}
  19         self.c_type_map = dict(
  20             uint8_t = ['number', 'number', 'Uint8Array'],
  21             uint16_t = ['number', 'number', 'Uint16Array'],
  22             uint32_t = ['number', 'number', 'Uint32Array'],
  23             uint64_t = ['bigint', 'bigint', 'BigUint64Array'],
  24         )
  25         self.java_type_map = dict(
  26             String = "number"
  27         )
  28         self.java_hu_type_map = dict(
  29             String = "string"
  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
  39         self.bindings_version_file = """export function get_ldk_java_bindings_version(): String {
  40         return "<git_version_ldk_garbagecollected>";
  41 }"""
  42
  43         self.bindings_footer = ""
  44
  45         self.common_base = """
  46 function freer(f: () => void) { f() }
  47 const finalizer = new FinalizationRegistry(freer);
  48 function get_freeer(ptr: number, free_fn: (ptr: number) => void) {
  49         return () => {
  50                 free_fn(ptr);
  51         }
  52 }
  53
  54 export default class CommonBase {
  55         protected ptr: number;
  56         protected ptrs_to: object[] = [];
  57         protected constructor(ptr: number, free_fn: (ptr: number) => void) {
  58                 this.ptr = ptr;
  59                 if (Number.isFinite(ptr) && ptr != 0){
  60                         finalizer.register(this, get_freeer(ptr, free_fn));
  61                 }
  62         }
  63         // In Java, protected means "any subclass can access fields on any other subclass'"
  64         // In TypeScript, protected means "any subclass can access parent fields on instances of itself"
  65         // To work around this, we add accessors for other instances' protected fields here.
  66         protected static add_ref_from(holder: CommonBase, referent: object) {
  67                 holder.ptrs_to.push(referent);
  68         }
  69         protected static get_ptr_of(o: CommonBase) {
  70                 return o.ptr;
  71         }
  72         protected static set_null_skip_free(o: CommonBase) {
  73                 o.ptr = 0;
  74                 finalizer.unregister(o);
  75         }
  76 }
  77 """
  78
  79         self.txout_defn = """export class TxOut extends CommonBase {
  80         /** The script_pubkey in this output */
  81         public script_pubkey: Uint8Array;
  82         /** The value, in satoshis, of this output */
  83         public value: bigint;
  84
  85         /* @internal */
  86         public constructor(_dummy: object, ptr: number) {
  87                 super(ptr, bindings.TxOut_free);
  88                 this.script_pubkey = bindings.decodeUint8Array(bindings.TxOut_get_script_pubkey(ptr));
  89                 this.value = bindings.TxOut_get_value(ptr);
  90         }
  91         public constructor_new(value: bigint, script_pubkey: Uint8Array): TxOut {
  92                 return new TxOut(null, bindings.TxOut_new(bindings.encodeUint8Array(script_pubkey), value));
  93         }
  94 }"""
  95         self.obj_defined(["TxOut"], "structs")
  96
  97         self.c_file_pfx = """#include "js-wasm.h"
  98 #include <stdatomic.h>
  99 #include <lightning.h>
 100
 101 // These should be provided...somehow...
 102 void *memset(void *s, int c, size_t n);
 103 void *memcpy(void *dest, const void *src, size_t n);
 104 int memcmp(const void *s1, const void *s2, size_t n);
 105
 106 extern void __attribute__((noreturn)) abort(void);
 107 static inline void assert(bool expression) {
 108         if (!expression) { abort(); }
 109 }
 110
 111 uint32_t __attribute__((export_name("test_bigint_pass_deadbeef0badf00d"))) test_bigint_pass_deadbeef0badf00d(uint64_t val) {
 112         return val == 0xdeadbeef0badf00dULL;
 113 }
 114
 115 """
 116
 117         if not DEBUG:
 118             self.c_file_pfx = self.c_file_pfx + """
 119 void *malloc(size_t size);
 120 void free(void *ptr);
 121
 122 #define MALLOC(a, _) malloc(a)
 123 #define FREE(p) if ((unsigned long)(p) > 4096) { free(p); }
 124 #define DO_ASSERT(a) (void)(a)
 125 #define CHECK(a)
 126 #define CHECK_ACCESS(p)
 127 #define CHECK_INNER_FIELD_ACCESS_OR_NULL(v)
 128 """
 129         else:
 130             self.c_file_pfx = self.c_file_pfx + """
 131 // Always run a, then assert it is true:
 132 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
 133 // Assert a is true or do nothing
 134 #define CHECK(a) DO_ASSERT(a)
 135
 136 // Running a leak check across all the allocations and frees of the JDK is a mess,
 137 // so instead we implement our own naive leak checker here, relying on the -wrap
 138 // linker option to wrap malloc/calloc/realloc/free, tracking everyhing allocated
 139 // and free'd in Rust or C across the generated bindings shared library.
 140
 141 #define BT_MAX 128
 142 typedef struct allocation {
 143         struct allocation* next;
 144         void* ptr;
 145         const char* struct_name;
 146 } allocation;
 147 static allocation* allocation_ll = NULL;
 148
 149 void* __real_malloc(size_t len);
 150 void* __real_calloc(size_t nmemb, size_t len);
 151 static void new_allocation(void* res, const char* struct_name) {
 152         allocation* new_alloc = __real_malloc(sizeof(allocation));
 153         new_alloc->ptr = res;
 154         new_alloc->struct_name = struct_name;
 155         new_alloc->next = allocation_ll;
 156         allocation_ll = new_alloc;
 157 }
 158 static void* MALLOC(size_t len, const char* struct_name) {
 159         void* res = __real_malloc(len);
 160         new_allocation(res, struct_name);
 161         return res;
 162 }
 163 void __real_free(void* ptr);
 164 static void alloc_freed(void* ptr) {
 165         allocation* p = NULL;
 166         allocation* it = allocation_ll;
 167         while (it->ptr != ptr) {
 168                 p = it; it = it->next;
 169                 if (it == NULL) {
 170                         //XXX: fprintf(stderr, "Tried to free unknown pointer %p\\n", ptr);
 171                         return; // addrsan should catch malloc-unknown and print more info than we have
 172                 }
 173         }
 174         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
 175         DO_ASSERT(it->ptr == ptr);
 176         __real_free(it);
 177 }
 178 static void FREE(void* ptr) {
 179         if ((unsigned long)ptr <= 4096) return; // Rust loves to create pointers to the NULL page for dummys
 180         alloc_freed(ptr);
 181         __real_free(ptr);
 182 }
 183
 184 static void CHECK_ACCESS(const void* ptr) {
 185         allocation* it = allocation_ll;
 186         while (it->ptr != ptr) {
 187                 it = it->next;
 188                 if (it == NULL) {
 189                         return; // addrsan should catch malloc-unknown and print more info than we have
 190                 }
 191         }
 192 }
 193 #define CHECK_INNER_FIELD_ACCESS_OR_NULL(v) \\
 194         if (v.is_owned && v.inner != NULL) { \\
 195                 const void *p = __unmangle_inner_ptr(v.inner); \\
 196                 if (p != NULL) { \\
 197                         CHECK_ACCESS(p); \\
 198                 } \\
 199         }
 200
 201 void* __wrap_malloc(size_t len) {
 202         void* res = __real_malloc(len);
 203         new_allocation(res, "malloc call");
 204         return res;
 205 }
 206 void* __wrap_calloc(size_t nmemb, size_t len) {
 207         void* res = __real_calloc(nmemb, len);
 208         new_allocation(res, "calloc call");
 209         return res;
 210 }
 211 void __wrap_free(void* ptr) {
 212         if (ptr == NULL) return;
 213         alloc_freed(ptr);
 214         __real_free(ptr);
 215 }
 216
 217 void* __real_realloc(void* ptr, size_t newlen);
 218 void* __wrap_realloc(void* ptr, size_t len) {
 219         if (ptr != NULL) alloc_freed(ptr);
 220         void* res = __real_realloc(ptr, len);
 221         new_allocation(res, "realloc call");
 222         return res;
 223 }
 224 void __wrap_reallocarray(void* ptr, size_t new_sz) {
 225         // Rust doesn't seem to use reallocarray currently
 226         DO_ASSERT(false);
 227 }
 228
 229 void __attribute__((destructor)) check_leaks() {
 230         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 231                 //XXX: fprintf(stderr, "%s %p remains\\n", a->struct_name, a->ptr);
 232         }
 233         DO_ASSERT(allocation_ll == NULL);
 234 }
 235 """
 236         self.c_file_pfx = self.c_file_pfx + """
 237 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
 238 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
 239 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
 240 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
 241
 242 _Static_assert(sizeof(void*) == 4, "Pointers mut be 32 bits");
 243
 244 #define DECL_ARR_TYPE(ty, name) \\
 245         struct name##array { \\
 246                 uint32_t arr_len; \\
 247                 ty elems[]; \\
 248         }; \\
 249         typedef struct name##array * name##Array; \\
 250         static inline name##Array init_##name##Array(size_t arr_len) { \\
 251                 name##Array arr = (name##Array)MALLOC(arr_len * sizeof(ty) + sizeof(uint32_t), "##name array init"); \\
 252                 arr->arr_len = arr_len; \\
 253                 return arr; \\
 254         }
 255
 256 DECL_ARR_TYPE(int64_t, int64_t);
 257 DECL_ARR_TYPE(int8_t, int8_t);
 258 DECL_ARR_TYPE(uint32_t, uint32_t);
 259 DECL_ARR_TYPE(void*, ptr);
 260 DECL_ARR_TYPE(char, char);
 261 typedef charArray jstring;
 262
 263 static inline jstring str_ref_to_ts(const char* chars, size_t len) {
 264         charArray arr = init_charArray(len);
 265         memcpy(arr->elems, chars, len);
 266         return arr;
 267 }
 268 static inline LDKStr str_ref_to_owned_c(const jstring str) {
 269         char* newchars = MALLOC(str->arr_len + 1, "String chars");
 270         memcpy(newchars, str->elems, str->arr_len);
 271         newchars[str->arr_len] = 0;
 272         LDKStr res = {
 273                 .chars = newchars,
 274                 .len = str->arr_len,
 275                 .chars_is_owned = true
 276         };
 277         return res;
 278 }
 279
 280 typedef bool jboolean;
 281
 282 uint32_t __attribute__((export_name("TS_malloc"))) TS_malloc(uint32_t size) {
 283         return (uint32_t)MALLOC(size, "JS-Called malloc");
 284 }
 285 void __attribute__((export_name("TS_free"))) TS_free(uint32_t ptr) {
 286         FREE((void*)ptr);
 287 }
 288
 289 jstring __attribute__((export_name("TS_get_ldk_c_bindings_version"))) TS_get_ldk_c_bindings_version() {
 290         const char *res = check_get_ldk_bindings_version();
 291         if (res == NULL) return NULL;
 292         return str_ref_to_ts(res, strlen(res));
 293 }
 294 jstring __attribute__((export_name("TS_get_ldk_version"))) get_ldk_version() {
 295         const char *res = check_get_ldk_version();
 296         if (res == NULL) return NULL;
 297         return str_ref_to_ts(res, strlen(res));
 298 }
 299 #include "version.c"
 300 """
 301
 302         self.c_version_file = """jstring __attribute__((export_name("TS_get_lib_version_string"))) TS_get_lib_version_string() {
 303         return str_ref_to_ts("<git_version_ldk_garbagecollected>", strlen("<git_version_ldk_garbagecollected>"));
 304 }"""
 305
 306         self.hu_struct_file_prefix = """
 307 import CommonBase from './CommonBase.mjs';
 308 import * as bindings from '../bindings.mjs'
 309
 310 """
 311         self.util_fn_pfx = self.hu_struct_file_prefix + "\nexport class UtilMethods extends CommonBase {\n"
 312         self.util_fn_sfx = "}"
 313         self.c_fn_ty_pfx = ""
 314         self.file_ext = ".mts"
 315         self.ptr_c_ty = "uint32_t"
 316         self.ptr_native_ty = "number"
 317         self.result_c_ty = "uint32_t"
 318         self.ptr_arr = "ptrArray"
 319         self.is_arr_some_check = ("", " != 0")
 320         self.get_native_arr_len_call = ("", "->arr_len")
 321
 322     def release_native_arr_ptr_call(self, ty_info, arr_var, arr_ptr_var):
 323         return None
 324     def create_native_arr_call(self, arr_len, ty_info):
 325         if ty_info.c_ty == "ptrArray":
 326             assert ty_info.subty is not None and ty_info.subty.c_ty.endswith("Array")
 327         return "init_" + ty_info.c_ty + "(" + arr_len + ")"
 328     def set_native_arr_contents(self, arr_name, arr_len, ty_info):
 329         if ty_info.c_ty == "int8_tArray":
 330             return ("memcpy(" + arr_name + "->elems, ", ", " + arr_len + ")")
 331         else:
 332             assert False
 333     def get_native_arr_contents(self, arr_name, dest_name, arr_len, ty_info, copy):
 334         if ty_info.c_ty == "int8_tArray":
 335             if copy:
 336                 return "memcpy(" + dest_name + ", " + arr_name + "->elems, " + arr_len + ")"
 337         if ty_info.c_ty == "ptrArray":
 338             return "(void*) " + arr_name + "->elems"
 339         else:
 340             assert not copy
 341             return arr_name + "->elems"
 342     def get_native_arr_elem(self, arr_name, idxc, ty_info):
 343         assert False # Only called if above is None
 344     def get_native_arr_ptr_call(self, ty_info):
 345         if ty_info.subty is not None:
 346             return "(" + ty_info.subty.c_ty + "*)(((uint8_t*)", ") + 4)"
 347         return "(" + ty_info.c_ty + "*)(((uint8_t*)", ") + 4)"
 348     def get_native_arr_entry_call(self, ty_info, arr_name, idxc, entry_access):
 349         return None
 350     def cleanup_native_arr_ref_contents(self, arr_name, dest_name, arr_len, ty_info):
 351         if ty_info.c_ty == "int8_tArray":
 352             return None
 353         else:
 354             return None
 355
 356     def map_hu_array_elems(self, arr_name, conv_name, arr_ty, elem_ty):
 357         assert elem_ty.c_ty == "uint32_t" or elem_ty.c_ty.endswith("Array")
 358         return arr_name + " != null ? " + arr_name + ".map(" + conv_name + " => " + elem_ty.from_hu_conv[0] + ") : null"
 359
 360     def str_ref_to_native_call(self, var_name, str_len):
 361         return "str_ref_to_ts(" + var_name + ", " + str_len + ")"
 362     def str_ref_to_c_call(self, var_name):
 363         return "str_ref_to_owned_c(" + var_name + ")"
 364     def str_to_hu_conv(self, var_name):
 365         return "const " + var_name + "_conv: string = bindings.decodeString(" + var_name + ");"
 366     def str_from_hu_conv(self, var_name):
 367         return ("bindings.encodeString(" + var_name + ")", "")
 368
 369     def c_fn_name_define_pfx(self, fn_name, have_args):
 370         return " __attribute__((export_name(\"TS_" + fn_name + "\"))) TS_" + fn_name + "("
 371
 372     def wasm_import_header(self, target):
 373         res = """
 374 import * as version from './version.mjs';
 375
 376 const imports: any = {};
 377 imports.env = {};
 378
 379 var js_objs: Array<WeakRef<object>> = [];
 380 var js_invoke: Function;
 381
 382 imports.wasi_snapshot_preview1 = {
 383         "fd_write": (fd: number, iovec_array_ptr: number, iovec_array_len: number) => {
 384                 // This should generally only be used to print panic messages
 385                 console.log("FD_WRITE to " + fd + " in " + iovec_array_len + " chunks.");
 386                 const ptr_len_view = new Uint32Array(wasm.memory.buffer, iovec_array_ptr, iovec_array_len * 2);
 387                 for (var i = 0; i < iovec_array_len; i++) {
 388                         const bytes_view = new Uint8Array(wasm.memory.buffer, ptr_len_view[i*2], ptr_len_view[i*2+1]);
 389                         console.log(String.fromCharCode(...bytes_view));
 390                 }
 391                 return 0;
 392         },
 393         "random_get": (buf_ptr: number, buf_len: number) => {
 394                 const buf = new Uint8Array(wasm.memory.buffer, buf_ptr, buf_len);
 395                 crypto.getRandomValues(buf);
 396                 return 0;
 397         },
 398         "environ_sizes_get": (environ_var_count_ptr: number, environ_len_ptr: number) => {
 399                 // This is called before fd_write to format + print panic messages
 400                 console.log("wasi_snapshot_preview1:environ_sizes_get");
 401                 const out_count_view = new Uint32Array(wasm.memory.buffer, environ_var_count_ptr, 1);
 402                 out_count_view[0] = 1;
 403                 const out_len_view = new Uint32Array(wasm.memory.buffer, environ_len_ptr, 1);
 404                 out_len_view[0] = "RUST_BACKTRACE=1".length + 1; // Note that string must be NULL-terminated
 405                 return 0;
 406         },
 407         "environ_get": (environ_ptr: number, environ_buf_ptr: number) => {
 408                 // This is called before fd_write to format + print panic messages
 409                 console.log("wasi_snapshot_preview1:environ_get");
 410                 const out_ptrs = new Uint32Array(wasm.memory.buffer, environ_ptr, 2);
 411                 out_ptrs[0] = environ_buf_ptr;
 412                 out_ptrs[1] = "RUST_BACKTRACE=1".length;
 413                 const out_environ = new Uint8Array(wasm.memory.buffer, environ_buf_ptr, out_ptrs[1]);
 414                 for (var i = 0; i < out_ptrs[1]; i++) { out_environ[i] = "RUST_BACKTRACE=1".codePointAt(i); }
 415                 out_environ[out_ptrs[1]] = 0;
 416                 return 0;
 417         },
 418         "proc_exit" : () => {
 419                 console.log("wasi_snapshot_preview1:proc_exit");
 420         },
 421 };
 422
 423 var wasm: any = null;
 424 let isWasmInitialized: boolean = false;
 425 """
 426
 427         if target == Target.NODEJS:
 428             res += """import * as fs from 'fs';
 429 import { webcrypto as crypto } from 'crypto';
 430 export async function initializeWasm(path: string) {
 431         const source = fs.readFileSync(path);
 432         imports.env["js_invoke_function"] = js_invoke;
 433         const { instance: wasmInstance } = await WebAssembly.instantiate(source, imports);"""
 434         else:
 435             res += """
 436 export async function initializeWasm(uri: string) {
 437         const stream = fetch(uri);
 438         imports.env["js_invoke_function"] = js_invoke;
 439         const { instance: wasmInstance } = await WebAssembly.instantiateStreaming(stream, imports);"""
 440
 441         return res + """
 442         wasm = wasmInstance.exports;
 443         if (!wasm.test_bigint_pass_deadbeef0badf00d(BigInt("0xdeadbeef0badf00d"))) {
 444                 throw new Error(\"Currently need BigInt-as-u64 support, try ----experimental-wasm-bigint");
 445         }
 446
 447         if (decodeString(wasm.TS_get_lib_version_string()) !== version.get_ldk_java_bindings_version())
 448                 throw new Error(\"Compiled LDK library and LDK class failes do not match\");
 449         // Fetching the LDK versions from C also checks that the header and binaries match
 450         if (wasm.TS_get_ldk_c_bindings_version() == 0)
 451                 throw new Error(\"LDK version did not match the header we built against\");
 452         if (wasm.TS_get_ldk_version() == 0)
 453                 throw new Error(\"LDK C bindings version did not match the header we built against\");
 454         const c_bindings_version: string = decodeString(wasm.TS_get_ldk_c_bindings_version());
 455         const ldk_version: string = decodeString(wasm.TS_get_ldk_version());
 456         console.log(\"Loaded LDK-Java Bindings with LDK \" + ldk_version + \" and LDK-C-Bindings \" + c_bindings_version);
 457
 458         isWasmInitialized = true;
 459 };
 460
 461 // WASM CODEC
 462
 463 const nextMultipleOfFour = (value: number) => {
 464         return Math.ceil(value / 4) * 4;
 465 }
 466
 467 export function encodeUint8Array (inputArray: Uint8Array): number {
 468         const cArrayPointer = wasm.TS_malloc(inputArray.length + 4);
 469         const arrayLengthView = new Uint32Array(wasm.memory.buffer, cArrayPointer, 1);
 470         arrayLengthView[0] = inputArray.length;
 471         const arrayMemoryView = new Uint8Array(wasm.memory.buffer, cArrayPointer + 4, inputArray.length);
 472         arrayMemoryView.set(inputArray);
 473         return cArrayPointer;
 474 }
 475 export function encodeUint32Array (inputArray: Uint32Array|Array<number>): number {
 476         const cArrayPointer = wasm.TS_malloc((inputArray.length + 1) * 4);
 477         const arrayMemoryView = new Uint32Array(wasm.memory.buffer, cArrayPointer, inputArray.length);
 478         arrayMemoryView.set(inputArray, 1);
 479         arrayMemoryView[0] = inputArray.length;
 480         return cArrayPointer;
 481 }
 482 export function encodeUint64Array (inputArray: BigUint64Array|Array<bigint>): number {
 483         const cArrayPointer = wasm.TS_malloc(inputArray.length * 8 + 1);
 484         const arrayLengthView = new Uint32Array(wasm.memory.buffer, cArrayPointer, 1);
 485         arrayLengthView[0] = inputArray.length;
 486         const arrayMemoryView = new BigUint64Array(wasm.memory.buffer, cArrayPointer + 4, inputArray.length);
 487         arrayMemoryView.set(inputArray);
 488         return cArrayPointer;
 489 }
 490
 491 export function check_arr_len(arr: Uint8Array, len: number): Uint8Array {
 492         if (arr.length != len) { throw new Error("Expected array of length " + len + "got " + arr.length); }
 493         return arr;
 494 }
 495
 496 export function getArrayLength(arrayPointer: number): number {
 497         const arraySizeViewer = new Uint32Array(wasm.memory.buffer, arrayPointer, 1);
 498         return arraySizeViewer[0];
 499 }
 500 export function decodeUint8Array (arrayPointer: number, free = true): Uint8Array {
 501         const arraySize = getArrayLength(arrayPointer);
 502         const actualArrayViewer = new Uint8Array(wasm.memory.buffer, arrayPointer + 4, arraySize);
 503         // Clone the contents, TODO: In the future we should wrap the Viewer in a class that
 504         // will free the underlying memory when it becomes unreachable instead of copying here.
 505         // Note that doing so may have edge-case interactions with memory resizing (invalidating the buffer).
 506         const actualArray = actualArrayViewer.slice(0, arraySize);
 507         if (free) {
 508                 wasm.TS_free(arrayPointer);
 509         }
 510         return actualArray;
 511 }
 512 const decodeUint32Array = (arrayPointer: number, free = true) => {
 513         const arraySize = getArrayLength(arrayPointer);
 514         const actualArrayViewer = new Uint32Array(
 515                 wasm.memory.buffer, // value
 516                 arrayPointer + 4, // offset (ignoring length bytes)
 517                 arraySize // uint32 count
 518         );
 519         // Clone the contents, TODO: In the future we should wrap the Viewer in a class that
 520         // will free the underlying memory when it becomes unreachable instead of copying here.
 521         const actualArray = actualArrayViewer.slice(0, arraySize);
 522         if (free) {
 523                 wasm.TS_free(arrayPointer);
 524         }
 525         return actualArray;
 526 }
 527
 528 export function getU32ArrayElem(arrayPointer: number, idx: number): number {
 529         const actualArrayViewer = new Uint32Array(wasm.memory.buffer, arrayPointer + 4, idx + 1);
 530         return actualArrayViewer[idx];
 531 }
 532
 533 export function encodeString(str: string): number {
 534         const charArray = new TextEncoder().encode(str);
 535         return encodeUint8Array(charArray);
 536 }
 537
 538 export function decodeString(stringPointer: number, free = true): string {
 539         const arraySize = getArrayLength(stringPointer);
 540         const memoryView = new Uint8Array(wasm.memory.buffer, stringPointer + 4, arraySize);
 541         const result = new TextDecoder("utf-8").decode(memoryView);
 542
 543         if (free) {
 544                 wasm.TS_free(stringPointer);
 545         }
 546
 547         return result;
 548 }
 549 """
 550
 551     def init_str(self):
 552         return ""
 553
 554     def get_java_arr_len(self, arr_name):
 555         return "bindings.getArrayLength(" + arr_name + ")"
 556     def get_java_arr_elem(self, elem_ty, arr_name, idx):
 557         if elem_ty.c_ty == "uint32_t" or elem_ty.c_ty == "uintptr_t" or elem_ty.c_ty.endswith("Array"):
 558             return "bindings.getU32ArrayElem(" + arr_name + ", " + idx + ")"
 559         else:
 560             assert False
 561     def constr_hu_array(self, ty_info, arr_len):
 562         return "new Array(" + arr_len + ").fill(null)"
 563
 564     def primitive_arr_from_hu(self, mapped_ty, fixed_len, arr_name):
 565         inner = arr_name
 566         if fixed_len is not None:
 567             assert mapped_ty.c_ty == "int8_t"
 568             inner = "bindings.check_arr_len(" + arr_name + ", " + fixed_len + ")"
 569         if mapped_ty.c_ty.endswith("Array"):
 570             return ("bindings.encodeUint32Array(" + inner + ")", "")
 571         elif mapped_ty.c_ty == "uint8_t" or mapped_ty.c_ty == "int8_t":
 572             return ("bindings.encodeUint8Array(" + inner + ")", "")
 573         elif mapped_ty.c_ty == "uint32_t":
 574             return ("bindings.encodeUint32Array(" + inner + ")", "")
 575         elif mapped_ty.c_ty == "int64_t":
 576             return ("bindings.encodeUint64Array(" + inner + ")", "")
 577         else:
 578             print(mapped_ty.c_ty)
 579             assert False
 580
 581     def primitive_arr_to_hu(self, mapped_ty, fixed_len, arr_name, conv_name):
 582         assert mapped_ty.c_ty == "uint8_t" or mapped_ty.c_ty == "int8_t"
 583         return "const " + conv_name + ": Uint8Array = bindings.decodeUint8Array(" + arr_name + ");"
 584
 585     def var_decl_statement(self, ty_string, var_name, statement):
 586         return "const " + var_name + ": " + ty_string + " = " + statement
 587
 588     def java_arr_ty_str(self, elem_ty_str):
 589         return "number"
 590
 591     def for_n_in_range(self, n, minimum, maximum):
 592         return "for (var " + n + " = " + minimum + "; " + n + " < " + maximum + "; " + n + "++) {"
 593     def for_n_in_arr(self, n, arr_name, arr_elem_ty):
 594         return (arr_name + ".forEach((" + n + ": " + arr_elem_ty.java_hu_ty + ") => { ", " })")
 595
 596     def get_ptr(self, var):
 597         return "CommonBase.get_ptr_of(" + var + ")"
 598     def set_null_skip_free(self, var):
 599         return "CommonBase.set_null_skip_free(" + var + ");"
 600
 601     def add_ref(self, holder, referent):
 602         return "CommonBase.add_ref_from(" + holder + ", " + referent + ")"
 603
 604     def obj_defined(self, struct_names, folder):
 605         with open(self.outdir + "/index.mts", 'a') as index:
 606             index.write(f"export * from './{folder}/{struct_names[0]}.mjs';\n")
 607         with open(self.outdir + "/imports.mts.part", 'a') as imports:
 608             imports.write(f"import {{ {', '.join(struct_names)} }} from '../{folder}/{struct_names[0]}.mjs';\n")
 609
 610     def native_c_unitary_enum_map(self, struct_name, variants, enum_doc_comment):
 611         out_c = "static inline LDK" + struct_name + " LDK" + struct_name + "_from_js(int32_t ord) {\n"
 612         out_c = out_c + "\tswitch (ord) {\n"
 613         ord_v = 0
 614
 615         out_typescript_enum_fields = ""
 616
 617         for var, var_docs in variants:
 618             out_c = out_c + "\t\tcase %d: return %s;\n" % (ord_v, var)
 619             ord_v = ord_v + 1
 620             if var_docs is not None:
 621                 out_typescript_enum_fields += f"/**\n * {var_docs}\n */\n"
 622             out_typescript_enum_fields += f"{var},\n\t\t\t\t"
 623         out_c = out_c + "\t}\n"
 624         out_c = out_c + "\tabort();\n"
 625         out_c = out_c + "}\n"
 626
 627         out_c = out_c + "static inline int32_t LDK" + struct_name + "_to_js(LDK" + struct_name + " val) {\n"
 628         out_c = out_c + "\tswitch (val) {\n"
 629         ord_v = 0
 630         for var, _ in variants:
 631             out_c = out_c + "\t\tcase " + var + ": return %d;\n" % ord_v
 632             ord_v = ord_v + 1
 633         out_c = out_c + "\t\tdefault: abort();\n"
 634         out_c = out_c + "\t}\n"
 635         out_c = out_c + "}\n"
 636
 637         out_typescript = f"""
 638             export enum {struct_name} {{
 639                 {out_typescript_enum_fields}
 640             }}
 641 """
 642         out_typescript_enum = f"export {{ {struct_name} }} from \"../bindings.mjs\";"
 643         self.obj_defined([struct_name], "enums")
 644         return (out_c, out_typescript_enum, out_typescript)
 645
 646     def c_unitary_enum_to_native_call(self, ty_info):
 647         return (ty_info.rust_obj + "_to_js(", ")")
 648     def native_unitary_enum_to_c_call(self, ty_info):
 649         return (ty_info.rust_obj + "_from_js(", ")")
 650
 651     def native_c_map_trait(self, struct_name, field_var_conversions, flattened_field_var_conversions, field_function_lines, trait_doc_comment):
 652         out_typescript_bindings = "\n\n\n// OUT_TYPESCRIPT_BINDINGS :: MAP_TRAIT :: START\n\n"
 653
 654         super_instantiator = ""
 655         bindings_instantiator = ""
 656         pointer_to_adder = ""
 657         impl_constructor_arguments = ""
 658         for var in flattened_field_var_conversions:
 659             if isinstance(var, ConvInfo):
 660                 impl_constructor_arguments += f", {var.arg_name}: {var.java_hu_ty}"
 661                 super_instantiator += first_to_lower(var.arg_name) + ", "
 662                 if var.from_hu_conv is not None:
 663                     bindings_instantiator += ", " + var.from_hu_conv[0]
 664                     if var.from_hu_conv[1] != "":
 665                         pointer_to_adder += "\t\t\t" + var.from_hu_conv[1] + ";\n"
 666                 else:
 667                     bindings_instantiator += ", " + first_to_lower(var.arg_name)
 668             else:
 669                 bindings_instantiator += ", " + first_to_lower(var[1]) + ".bindings_instance"
 670                 super_instantiator += first_to_lower(var[1]) + "_impl, "
 671                 pointer_to_adder += "\t\timpl_holder.held.ptrs_to.push(" + first_to_lower(var[1]) + ");\n"
 672                 impl_constructor_arguments += f", {first_to_lower(var[1])}_impl: {var[0].replace('LDK', '')}Interface"
 673
 674         super_constructor_statements = ""
 675         trait_constructor_arguments = ""
 676         for var in field_var_conversions:
 677             if isinstance(var, ConvInfo):
 678                 trait_constructor_arguments += ", " + var.arg_name
 679             else:
 680                 super_constructor_statements += "\t\tconst " + first_to_lower(var[1]) + " = " + var[1] + ".new_impl(" + super_instantiator + ");\n"
 681                 trait_constructor_arguments += ", " + first_to_lower(var[1]) + ".bindings_instance"
 682                 for suparg in var[2]:
 683                     if isinstance(suparg, ConvInfo):
 684                         trait_constructor_arguments += ", " + suparg.arg_name
 685                     else:
 686                         trait_constructor_arguments += ", " + suparg[1]
 687
 688         # BUILD INTERFACE METHODS
 689         out_java_interface = ""
 690         out_interface_implementation_overrides = ""
 691         java_methods = []
 692         for fn_line in field_function_lines:
 693             java_method_descriptor = ""
 694             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 695                 out_java_interface += "\t" + fn_line.fn_name + "("
 696                 out_interface_implementation_overrides += f"\t\t\t{fn_line.fn_name} ("
 697
 698                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 699                     if idx >= 1:
 700                         out_java_interface += ", "
 701                         out_interface_implementation_overrides += ", "
 702                     out_java_interface += f"{arg_conv_info.arg_name}: {arg_conv_info.java_hu_ty}"
 703                     out_interface_implementation_overrides += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
 704                     java_method_descriptor += arg_conv_info.java_fn_ty_arg
 705                 out_java_interface += f"): {fn_line.ret_ty_info.java_hu_ty};\n"
 706                 java_method_descriptor += ")" + fn_line.ret_ty_info.java_fn_ty_arg
 707                 java_methods.append((fn_line.fn_name, java_method_descriptor))
 708
 709                 out_interface_implementation_overrides += f"): {fn_line.ret_ty_info.java_ty} {{\n"
 710
 711                 for arg_info in fn_line.args_ty:
 712                     if arg_info.to_hu_conv is not None:
 713                         out_interface_implementation_overrides += "\t\t\t\t" + arg_info.to_hu_conv.replace("\n", "\n\t\t\t\t") + "\n"
 714
 715                 if fn_line.ret_ty_info.java_ty != "void":
 716                     out_interface_implementation_overrides += "\t\t\t\tconst ret: " + fn_line.ret_ty_info.java_hu_ty + " = arg." + fn_line.fn_name + "("
 717                 else:
 718                     out_interface_implementation_overrides += f"\t\t\t\targ." + fn_line.fn_name + "("
 719
 720                 for idx, arg_info in enumerate(fn_line.args_ty):
 721                     if idx != 0:
 722                         out_interface_implementation_overrides += ", "
 723                     if arg_info.to_hu_conv_name is not None:
 724                         out_interface_implementation_overrides += arg_info.to_hu_conv_name
 725                     else:
 726                         out_interface_implementation_overrides += arg_info.arg_name
 727
 728                 out_interface_implementation_overrides += ");\n"
 729                 if fn_line.ret_ty_info.java_ty != "void":
 730                     if fn_line.ret_ty_info.from_hu_conv is not None:
 731                         out_interface_implementation_overrides += "\t\t\t\t" + f"const result: {fn_line.ret_ty_info.java_ty} = " + fn_line.ret_ty_info.from_hu_conv[0].replace("\n", "\n\t\t\t\t") + ";\n"
 732                         if fn_line.ret_ty_info.from_hu_conv[1] != "":
 733                             out_interface_implementation_overrides += "\t\t\t\t" + fn_line.ret_ty_info.from_hu_conv[1].replace("this", "impl_holder.held").replace("\n", "\n\t\t\t\t") + ";\n"
 734                         #if fn_line.ret_ty_info.rust_obj in result_types:
 735                         # XXX: We need to handle this in conversion logic so that its cross-language!
 736                         # Avoid double-free by breaking the result - we should learn to clone these and then we can be safe instead
 737                         #    out_interface_implementation_overrides = out_interface_implementation_overrides + "\t\t\t\tret.ptr = 0;\n"
 738                         out_interface_implementation_overrides += "\t\t\t\treturn result;\n"
 739                     else:
 740                         out_interface_implementation_overrides += "\t\t\t\treturn ret;\n"
 741                 out_interface_implementation_overrides += f"\t\t\t}},\n"
 742
 743         out_typescript_human = f"""
 744 {self.hu_struct_file_prefix}
 745
 746 export interface {struct_name.replace("LDK", "")}Interface {{
 747 {out_java_interface}}}
 748
 749 class {struct_name}Holder {{
 750         held: {struct_name.replace("LDK", "")};
 751 }}
 752
 753 export class {struct_name.replace("LDK","")} extends CommonBase {{
 754         /* @internal */
 755         public bindings_instance?: bindings.{struct_name};
 756
 757         /* @internal */
 758         constructor(_dummy: object, ptr: number) {{
 759                 super(ptr, bindings.{struct_name.replace("LDK","")}_free);
 760                 this.bindings_instance = null;
 761         }}
 762
 763         static new_impl(arg: {struct_name.replace("LDK", "")}Interface{impl_constructor_arguments}): {struct_name.replace("LDK", "")} {{
 764                 const impl_holder: {struct_name}Holder = new {struct_name}Holder();
 765                 let structImplementation = {{
 766 {out_interface_implementation_overrides}                }} as bindings.{struct_name};
 767 {super_constructor_statements}          const ptr: number = bindings.{struct_name}_new(structImplementation{bindings_instantiator});
 768
 769                 impl_holder.held = new {struct_name.replace("LDK", "")}(null, ptr);
 770                 impl_holder.held.bindings_instance = structImplementation;
 771 {pointer_to_adder}              return impl_holder.held;
 772         }}
 773 """
 774         self.obj_defined([struct_name.replace("LDK", ""), struct_name.replace("LDK", "") + "Interface"], "structs")
 775
 776         out_typescript_bindings += "export interface " + struct_name + " {\n"
 777         java_meths = []
 778         for fn_line in field_function_lines:
 779             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 780                 out_typescript_bindings += f"\t{fn_line.fn_name} ("
 781
 782                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 783                     if idx >= 1:
 784                         out_typescript_bindings = out_typescript_bindings + ", "
 785                     out_typescript_bindings += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
 786
 787                 out_typescript_bindings += f"): {fn_line.ret_ty_info.java_ty};\n"
 788
 789         out_typescript_bindings += "}\n\n"
 790
 791         out_typescript_bindings += f"export function {struct_name}_new(impl: {struct_name}"
 792         for var in flattened_field_var_conversions:
 793             if isinstance(var, ConvInfo):
 794                 out_typescript_bindings += f", {var.arg_name}: {var.java_ty}"
 795             else:
 796                 out_typescript_bindings += f", {var[1]}: {var[0]}"
 797
 798         out_typescript_bindings += f"""): number {{
 799         if(!isWasmInitialized) {{
 800                 throw new Error("initializeWasm() must be awaited first!");
 801         }}
 802         var new_obj_idx = js_objs.length;
 803         for (var i = 0; i < js_objs.length; i++) {{
 804                 if (js_objs[i] == null || js_objs[i] == undefined) {{ new_obj_idx = i; break; }}
 805         }}
 806         js_objs[i] = new WeakRef(impl);
 807         return wasm.TS_{struct_name}_new(i);
 808 }}
 809 """
 810
 811         out_typescript_bindings += '\n// OUT_TYPESCRIPT_BINDINGS :: MAP_TRAIT :: END\n\n\n'
 812
 813         # Now that we've written out our java code (and created java_meths), generate C
 814         out_c = "typedef struct " + struct_name + "_JCalls {\n"
 815         out_c += "\tatomic_size_t refcnt;\n"
 816         out_c += "\tuint32_t instance_ptr;\n"
 817         for var in flattened_field_var_conversions:
 818             if isinstance(var, ConvInfo):
 819                 # We're a regular ol' field
 820                 pass
 821             else:
 822                 # We're a supertrait
 823                 out_c = out_c + "\t" + var[0] + "_JCalls* " + var[1] + ";\n"
 824         out_c = out_c + "} " + struct_name + "_JCalls;\n"
 825
 826         for fn_line in field_function_lines:
 827             if fn_line.fn_name == "free":
 828                 out_c = out_c + "static void " + struct_name + "_JCalls_free(void* this_arg) {\n"
 829                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 830                 out_c = out_c + "\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n"
 831                 out_c = out_c + "\t\tFREE(j_calls);\n"
 832                 out_c = out_c + "\t}\n}\n"
 833
 834         for idx, fn_line in enumerate(field_function_lines):
 835             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 836                 assert fn_line.ret_ty_info.ty_info.get_full_rust_ty()[1] == ""
 837                 out_c = out_c + fn_line.ret_ty_info.ty_info.get_full_rust_ty()[0] + " " + fn_line.fn_name + "_" + struct_name + "_jcall("
 838                 if fn_line.self_is_const:
 839                     out_c = out_c + "const void* this_arg"
 840                 else:
 841                     out_c = out_c + "void* this_arg"
 842
 843                 for idx, arg in enumerate(fn_line.args_ty):
 844                     out_c = out_c + ", " + arg.ty_info.get_full_rust_ty()[0] + " " + arg.arg_name + arg.ty_info.get_full_rust_ty()[1]
 845
 846                 out_c = out_c + ") {\n"
 847                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 848
 849                 for arg_info in fn_line.args_ty:
 850                     if arg_info.ret_conv is not None:
 851                         out_c = out_c + "\t" + arg_info.ret_conv[0].replace('\n', '\n\t')
 852                         out_c = out_c + arg_info.arg_name
 853                         out_c = out_c + arg_info.ret_conv[1].replace('\n', '\n\t') + "\n"
 854
 855                 if fn_line.ret_ty_info.c_ty.endswith("Array"):
 856                     out_c += "\t" + fn_line.ret_ty_info.c_ty + " ret = (" + fn_line.ret_ty_info.c_ty + ")"
 857                     out_c += "js_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
 858                 elif fn_line.ret_ty_info.java_ty == "void":
 859                     out_c = out_c + "\tjs_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
 860                 elif fn_line.ret_ty_info.java_hu_ty == "string":
 861                     out_c = out_c + "\tjstring ret = (jstring)js_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
 862                 elif not fn_line.ret_ty_info.passed_as_ptr:
 863                     out_c = out_c + "\treturn js_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
 864                 else:
 865                     out_c = out_c + "\tuint32_t ret = js_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
 866
 867                 self.function_ptrs[self.function_ptr_counter] = (struct_name, fn_line.fn_name)
 868                 self.function_ptr_counter += 1
 869
 870                 for idx, arg_info in enumerate(fn_line.args_ty):
 871                     if arg_info.ret_conv is not None:
 872                         out_c = out_c + ", (uint32_t)" + arg_info.ret_conv_name
 873                     else:
 874                         out_c = out_c + ", (uint32_t)" + arg_info.arg_name
 875                 out_c = out_c + ");\n"
 876                 if fn_line.ret_ty_info.arg_conv is not None:
 877                     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"
 878
 879                 out_c = out_c + "}\n"
 880
 881         # Write out a clone function whether we need one or not, as we use them in moving to rust
 882         out_c = out_c + "static void " + struct_name + "_JCalls_cloned(" + struct_name + "* new_obj) {\n"
 883         out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) new_obj->this_arg;\n"
 884         out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n"
 885         for var in field_var_conversions:
 886             if not isinstance(var, ConvInfo):
 887                 out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->" + var[1] + "->refcnt, 1, memory_order_release);\n"
 888         out_c = out_c + "}\n"
 889
 890         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_init (JSValue o"
 891         for var in flattened_field_var_conversions:
 892             if isinstance(var, ConvInfo):
 893                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 894             else:
 895                 out_c = out_c + ", JSValue " + var[1]
 896         out_c = out_c + ") {\n"
 897
 898         out_c = out_c + "\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n"
 899         out_c = out_c + "\tatomic_init(&calls->refcnt, 1);\n"
 900         out_c = out_c + "\tcalls->instance_ptr = o;\n"
 901
 902         for (fn_name, java_meth_descr) in java_meths:
 903             if fn_name != "free" and fn_name != "cloned":
 904                 out_c = out_c + "\tcalls->" + fn_name + "_meth = (*env)->GetMethodID(env, c, \"" + fn_name + "\", \"" + java_meth_descr + "\");\n"
 905                 out_c = out_c + "\tCHECK(calls->" + fn_name + "_meth != NULL);\n"
 906
 907         for var in flattened_field_var_conversions:
 908             if isinstance(var, ConvInfo) and var.arg_conv is not None:
 909                 out_c = out_c + "\n\t" + var.arg_conv.replace("\n", "\n\t") +"\n"
 910         out_c = out_c + "\n\t" + struct_name + " ret = {\n"
 911         out_c = out_c + "\t\t.this_arg = (void*) calls,\n"
 912         for fn_line in field_function_lines:
 913             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 914                 out_c = out_c + "\t\t." + fn_line.fn_name + " = " + fn_line.fn_name + "_" + struct_name + "_jcall,\n"
 915             elif fn_line.fn_name == "free":
 916                 out_c = out_c + "\t\t.free = " + struct_name + "_JCalls_free,\n"
 917             else:
 918                 out_c = out_c + "\t\t.cloned = " + struct_name + "_JCalls_cloned,\n"
 919         for var in field_var_conversions:
 920             if isinstance(var, ConvInfo):
 921                 if var.arg_conv_name is not None:
 922                     out_c = out_c + "\t\t." + var.arg_name + " = " + var.arg_conv_name + ",\n"
 923                     out_c = out_c + "\t\t.set_" + var.arg_name + " = NULL,\n"
 924                 else:
 925                     out_c = out_c + "\t\t." + var.var_name + " = " + var.var_name + ",\n"
 926                     out_c = out_c + "\t\t.set_" + var.var_name + " = NULL,\n"
 927             else:
 928                 out_c += "\t\t." + var[1] + " = " + var[0] + "_init(" + var[1]
 929                 for suparg in var[2]:
 930                     if isinstance(suparg, ConvInfo):
 931                         out_c += ", " + suparg.arg_name
 932                     else:
 933                         out_c += ", " + suparg[1]
 934                 out_c += "),\n"
 935         out_c = out_c + "\t};\n"
 936         for var in flattened_field_var_conversions:
 937             if not isinstance(var, ConvInfo):
 938                 out_c = out_c + "\tcalls->" + var[1] + " = ret." + var[1] + ".this_arg;\n"
 939         out_c = out_c + "\treturn ret;\n"
 940         out_c = out_c + "}\n"
 941
 942         out_c = out_c + self.c_fn_ty_pfx + "long " + self.c_fn_name_define_pfx(struct_name + "_new", True) + "JSValue o"
 943         for var in flattened_field_var_conversions:
 944             if isinstance(var, ConvInfo):
 945                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 946             else:
 947                 out_c = out_c + ", JSValue " + var[1]
 948         out_c = out_c + ") {\n"
 949         out_c = out_c + "\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n"
 950         out_c = out_c + "\t*res_ptr = " + struct_name + "_init(o"
 951         for var in flattened_field_var_conversions:
 952             if isinstance(var, ConvInfo):
 953                 out_c = out_c + ", " + var.arg_name
 954             else:
 955                 out_c = out_c + ", " + var[1]
 956         out_c = out_c + ");\n"
 957         out_c = out_c + "\treturn (long)res_ptr;\n"
 958         out_c = out_c + "}\n"
 959
 960         return (out_typescript_bindings, out_typescript_human, out_c)
 961
 962     def trait_struct_inc_refcnt(self, ty_info):
 963         return ""
 964
 965     def map_complex_enum(self, struct_name, variant_list, camel_to_snake, enum_doc_comment):
 966         bindings_type = struct_name.replace("LDK", "")
 967         java_hu_type = struct_name.replace("LDK", "").replace("COption", "Option")
 968
 969         out_java_enum = ""
 970         out_java = ""
 971         out_c = ""
 972
 973         out_java_enum += (self.hu_struct_file_prefix)
 974
 975         java_hu_class = ""
 976         java_hu_class += "export class " + java_hu_type + " extends CommonBase {\n"
 977         java_hu_class += "\tprotected constructor(_dummy: object, ptr: number) { super(ptr, bindings." + bindings_type + "_free); }\n"
 978         java_hu_class += "\t/* @internal */\n"
 979         java_hu_class += f"\tpublic static constr_from_ptr(ptr: number): {java_hu_type} {{\n"
 980         java_hu_class += f"\t\tconst raw_ty: number = bindings." + struct_name + "_ty_from_ptr(ptr);\n"
 981         out_c += self.c_fn_ty_pfx + "uint32_t" + self.c_fn_name_define_pfx(struct_name + "_ty_from_ptr", True) + self.ptr_c_ty + " ptr) {\n"
 982         out_c += "\t" + struct_name + " *obj = (" + struct_name + "*)(ptr & ~1);\n"
 983         out_c += "\tswitch(obj->tag) {\n"
 984         java_hu_class += "\t\tswitch (raw_ty) {\n"
 985         java_hu_subclasses = ""
 986
 987         out_java += "export class " + struct_name + " {\n"
 988         out_java += "\tprotected constructor() {}\n"
 989         var_idx = 0
 990         for var in variant_list:
 991             java_hu_subclasses = java_hu_subclasses + "export class " + java_hu_type + "_" + var.var_name + " extends " + java_hu_type + " {\n"
 992             java_hu_class += f"\t\t\tcase {var_idx}: "
 993             java_hu_class += "return new " + java_hu_type + "_" + var.var_name + "(ptr);\n"
 994             out_c += f"\t\tcase {struct_name}_{var.var_name}: return {var_idx};\n"
 995             hu_conv_body = ""
 996             for idx, (field_ty, field_docs) in enumerate(var.fields):
 997                 java_hu_subclasses = java_hu_subclasses + "\tpublic " + field_ty.arg_name + f": {field_ty.java_hu_ty};\n"
 998                 if field_ty.to_hu_conv is not None:
 999                     hu_conv_body += f"\t\tconst {field_ty.arg_name}: {field_ty.java_ty} = bindings.{struct_name}_{var.var_name}_get_{field_ty.arg_name}(ptr);\n"
1000                     hu_conv_body += f"\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
1001                     hu_conv_body += f"\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
1002                 else:
1003                     hu_conv_body += f"\t\tthis.{field_ty.arg_name} = bindings.{struct_name}_{var.var_name}_get_{field_ty.arg_name}(ptr);\n"
1004             java_hu_subclasses += "\t/* @internal */\n"
1005             java_hu_subclasses += "\tpublic constructor(ptr: number) {\n\t\tsuper(null, ptr);\n"
1006             java_hu_subclasses = java_hu_subclasses + hu_conv_body
1007             java_hu_subclasses = java_hu_subclasses + "\t}\n}\n"
1008             var_idx += 1
1009         out_java += "}\n"
1010         java_hu_class += "\t\t\tdefault:\n\t\t\t\tthrow new Error('oops, this should be unreachable'); // Unreachable without extending the (internal) bindings interface\n\t\t}\n\t}\n\n"
1011         out_java += self.fn_call_body(struct_name + "_ty_from_ptr", "uint32_t", "number", "ptr: number", "ptr")
1012         out_c += ("\t\tdefault: abort();\n")
1013         out_c += ("\t}\n}\n")
1014
1015         for var in variant_list:
1016             for idx, (field_map, _) in enumerate(var.fields):
1017                 fn_name = f"{struct_name}_{var.var_name}_get_{field_map.arg_name}"
1018                 out_c += self.c_fn_ty_pfx + field_map.c_ty + self.c_fn_name_define_pfx(fn_name, True) + self.ptr_c_ty + " ptr) {\n"
1019                 out_c += "\t" + struct_name + " *obj = (" + struct_name + "*)(ptr & ~1);\n"
1020                 out_c += f"\tassert(obj->tag == {struct_name}_{var.var_name});\n"
1021                 if field_map.ret_conv is not None:
1022                     out_c += ("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
1023                     if var.tuple_variant:
1024                         out_c += "obj->" + camel_to_snake(var.var_name)
1025                     else:
1026                         out_c += "obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name
1027                     out_c += (field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
1028                     out_c += "\treturn " + field_map.ret_conv_name + ";\n"
1029                 else:
1030                     if var.tuple_variant:
1031                         out_c += "\treturn " + "obj->" + camel_to_snake(var.var_name) + ";\n"
1032                     else:
1033                         out_c += "\treturn " + "obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name + ";\n"
1034                 out_c += "}\n"
1035                 out_java += self.fn_call_body(fn_name, field_map.c_ty, field_map.java_ty, "ptr: number", "ptr")
1036         out_java_enum += java_hu_class
1037         self.struct_file_suffixes[java_hu_type] = java_hu_subclasses
1038         self.obj_defined([java_hu_type], "structs")
1039         return (out_java, out_java_enum, out_c)
1040
1041     def map_opaque_struct(self, struct_name, struct_doc_comment):
1042         implementations = ""
1043         method_header = ""
1044
1045         hu_name = struct_name.replace("LDKC2Tuple", "TwoTuple").replace("LDKC3Tuple", "ThreeTuple").replace("LDK", "")
1046         out_opaque_struct_human = f"{self.hu_struct_file_prefix}"
1047         if struct_name.startswith("LDKLocked"):
1048             out_opaque_struct_human += "/** XXX: DO NOT USE THIS - it remains locked until the GC runs (if that ever happens */"
1049         out_opaque_struct_human += f"""
1050 export class {hu_name} extends CommonBase {implementations}{{
1051         /* @internal */
1052         public constructor(_dummy: object, ptr: number) {{
1053                 super(ptr, bindings.{struct_name.replace("LDK","")}_free);
1054         }}
1055
1056 """
1057         self.obj_defined([hu_name], "structs")
1058         return out_opaque_struct_human
1059
1060     def map_tuple(self, struct_name):
1061         return self.map_opaque_struct(struct_name, "A Tuple")
1062
1063     def map_result(self, struct_name, res_map, err_map):
1064         human_ty = struct_name.replace("LDKCResult", "Result")
1065
1066         suffixes = f"export class {human_ty}_OK extends {human_ty} {{\n"
1067         if res_map.java_hu_ty != "void":
1068             suffixes += "\tpublic res: " + res_map.java_hu_ty + ";\n"
1069         suffixes += f"""
1070         /* @internal */
1071         public constructor(_dummy: object, ptr: number) {{
1072                 super(_dummy, ptr);
1073 """
1074         if res_map.java_hu_ty == "void":
1075             pass
1076         elif res_map.to_hu_conv is not None:
1077             suffixes += "\t\tconst res: " + res_map.java_ty + " = bindings." + struct_name.replace("LDK", "") + "_get_ok(ptr);\n"
1078             suffixes += "\t\t" + res_map.to_hu_conv.replace("\n", "\n\t\t")
1079             suffixes += "\n\t\tthis.res = " + res_map.to_hu_conv_name + ";\n"
1080         else:
1081             suffixes += "\t\tthis.res = bindings." + struct_name.replace("LDK", "") + "_get_ok(ptr);\n"
1082         suffixes += "\t}\n}\n"
1083
1084         suffixes += f"export class {human_ty}_Err extends {human_ty} {{\n"
1085         if err_map.java_hu_ty != "void":
1086             suffixes += "\tpublic err: " + err_map.java_hu_ty + ";\n"
1087         suffixes += f"""
1088         /* @internal */
1089         public constructor(_dummy: object, ptr: number) {{
1090                 super(_dummy, ptr);
1091 """
1092         if err_map.java_hu_ty == "void":
1093             pass
1094         elif err_map.to_hu_conv is not None:
1095             suffixes += "\t\tconst err: " + err_map.java_ty + " = bindings." + struct_name.replace("LDK", "") + "_get_err(ptr);\n"
1096             suffixes += "\t\t" + err_map.to_hu_conv.replace("\n", "\n\t\t")
1097             suffixes += "\n\t\tthis.err = " + err_map.to_hu_conv_name + ";\n"
1098         else:
1099             suffixes += "\t\tthis.err = bindings." + struct_name.replace("LDK", "") + "_get_err(ptr);\n"
1100         suffixes += "\t}\n}"
1101
1102         self.struct_file_suffixes[human_ty] = suffixes
1103         self.obj_defined([human_ty], "structs")
1104
1105         return f"""{self.hu_struct_file_prefix}
1106
1107 export class {human_ty} extends CommonBase {{
1108         protected constructor(_dummy: object, ptr: number) {{
1109                 super(ptr, bindings.{struct_name.replace("LDK","")}_free);
1110         }}
1111         /* @internal */
1112         public static constr_from_ptr(ptr: number): {human_ty} {{
1113                 if (bindings.{struct_name.replace("LDK", "")}_is_ok(ptr)) {{
1114                         return new {human_ty}_OK(null, ptr);
1115                 }} else {{
1116                         return new {human_ty}_Err(null, ptr);
1117                 }}
1118         }}
1119 """
1120
1121     def fn_call_body(self, method_name, return_c_ty, return_java_ty, method_argument_string, native_call_argument_string):
1122         has_return_value = return_c_ty != 'void'
1123         return_statement = 'return nativeResponseValue;'
1124         if not has_return_value:
1125             return_statement = '// debug statements here'
1126
1127         return f"""export function {method_name}({method_argument_string}): {return_java_ty} {{
1128         if(!isWasmInitialized) {{
1129                 throw new Error("initializeWasm() must be awaited first!");
1130         }}
1131         const nativeResponseValue = wasm.TS_{method_name}({native_call_argument_string});
1132         {return_statement}
1133 }}
1134 """
1135     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):
1136         out_java = ""
1137         out_c = ""
1138         out_java_struct = None
1139
1140         out_java += ("\t")
1141         out_c += (self.c_fn_ty_pfx)
1142         out_c += (return_type_info.c_ty)
1143         out_java += (return_type_info.java_ty)
1144         if return_type_info.ret_conv is not None:
1145             ret_conv_pfx, ret_conv_sfx = return_type_info.ret_conv
1146         out_java += (" " + method_name + "(")
1147         out_c += (" "  + self.c_fn_name_define_pfx(method_name, True))
1148
1149         method_argument_string = ""
1150         native_call_argument_string = ""
1151         for idx, arg_conv_info in enumerate(argument_types):
1152             if idx != 0:
1153                 method_argument_string += (", ")
1154                 native_call_argument_string += ', '
1155                 out_c += (", ")
1156             if arg_conv_info.c_ty != "void":
1157                 out_c += (arg_conv_info.c_ty + " " + arg_conv_info.arg_name)
1158                 method_argument_string += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
1159                 native_call_argument_string += arg_conv_info.arg_name
1160         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)
1161
1162         out_java_struct = ""
1163         if not args_known:
1164             out_java_struct += ("\t// Skipped " + method_name + "\n")
1165         else:
1166             if not takes_self:
1167                 out_java_struct += (
1168                         "\tpublic static constructor_" + meth_n + "(")
1169             else:
1170                 out_java_struct += ("\tpublic " + meth_n + "(")
1171             for idx, arg in enumerate(argument_types):
1172                 if idx != 0:
1173                     if not takes_self or idx > 1:
1174                         out_java_struct += (", ")
1175                 elif takes_self:
1176                     continue
1177                 if arg.java_ty != "void":
1178                     if arg.arg_name in default_constructor_args:
1179                         for explode_idx, explode_arg in enumerate(default_constructor_args[arg.arg_name]):
1180                             if explode_idx != 0:
1181                                 out_java_struct += (", ")
1182                             out_java_struct += arg.arg_name + "_" + explode_arg.arg_name + ": " + explode_arg.java_hu_ty
1183                     else:
1184                         out_java_struct += arg.arg_name + ": " + arg.java_hu_ty
1185
1186         out_c += (") {\n")
1187         if out_java_struct is not None:
1188             out_java_struct += "): " + return_type_info.java_hu_ty + " {\n"
1189         for info in argument_types:
1190             if info.arg_conv is not None:
1191                 out_c += ("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
1192         if return_type_info.ret_conv is not None:
1193             out_c += ("\t" + ret_conv_pfx.replace('\n', '\n\t'))
1194         elif return_type_info.c_ty != "void":
1195             out_c += ("\t" + return_type_info.c_ty + " ret_val = ")
1196         else:
1197             out_c += ("\t")
1198         if c_call_string is None:
1199             out_c += (method_name + "(")
1200         else:
1201             out_c += (c_call_string)
1202         for idx, info in enumerate(argument_types):
1203             if info.arg_conv_name is not None:
1204                 if idx != 0:
1205                     out_c += (", ")
1206                 elif c_call_string is not None:
1207                     continue
1208                 out_c += (info.arg_conv_name)
1209         out_c += (")")
1210         if return_type_info.ret_conv is not None:
1211             out_c += (ret_conv_sfx.replace('\n', '\n\t'))
1212         else:
1213             out_c += (";")
1214         for info in argument_types:
1215             if info.arg_conv_cleanup is not None:
1216                 out_c += ("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
1217         if return_type_info.ret_conv is not None:
1218             out_c += ("\n\treturn " + return_type_info.ret_conv_name + ";")
1219         elif return_type_info.c_ty != "void":
1220             out_c += ("\n\treturn ret_val;")
1221         out_c += ("\n}\n\n")
1222
1223         if args_known:
1224             out_java_struct += ("\t\t")
1225             if return_type_info.java_ty != "void":
1226                 out_java_struct += "const ret: " + return_type_info.java_ty + " = "
1227             out_java_struct += ("bindings." + method_name + "(")
1228             for idx, info in enumerate(argument_types):
1229                 if idx != 0:
1230                     out_java_struct += (", ")
1231                 if idx == 0 and takes_self:
1232                     out_java_struct += ("this.ptr")
1233                 elif info.arg_name in default_constructor_args:
1234                     out_java_struct += ("bindings." + info.java_hu_ty + "_new(")
1235                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
1236                         if explode_idx != 0:
1237                             out_java_struct += (", ")
1238                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1239                         if explode_arg.from_hu_conv is not None:
1240                             out_java_struct += (
1241                                 explode_arg.from_hu_conv[0].replace(explode_arg.arg_name, expl_arg_name))
1242                         else:
1243                             out_java_struct += (expl_arg_name)
1244                     out_java_struct += (")")
1245                 elif info.from_hu_conv is not None:
1246                     out_java_struct += (info.from_hu_conv[0])
1247                 else:
1248                     out_java_struct += (info.arg_name)
1249             out_java_struct += (");\n")
1250             if return_type_info.to_hu_conv is not None:
1251                 if not takes_self:
1252                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t").replace("this",
1253                                                                                                              return_type_info.to_hu_conv_name) + "\n")
1254                 else:
1255                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t") + "\n")
1256
1257             for idx, info in enumerate(argument_types):
1258                 if idx == 0 and takes_self:
1259                     pass
1260                 elif info.arg_name in default_constructor_args:
1261                     for explode_arg in default_constructor_args[info.arg_name]:
1262                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1263                         if explode_arg.from_hu_conv is not None and return_type_info.to_hu_conv_name:
1264                             out_java_struct += ("\t\t" + explode_arg.from_hu_conv[1].replace(explode_arg.arg_name,
1265                                                                                              expl_arg_name).replace(
1266                                 "this", return_type_info.to_hu_conv_name) + ";\n")
1267                 elif info.from_hu_conv is not None and info.from_hu_conv[1] != "":
1268                     if not takes_self and return_type_info.to_hu_conv_name is not None:
1269                         out_java_struct += (
1270                                 "\t\t" + info.from_hu_conv[1].replace("this", return_type_info.to_hu_conv_name).replace("\n", "\n\t\t") + ";\n")
1271                     else:
1272                         out_java_struct += ("\t\t" + info.from_hu_conv[1].replace("\n", "\n\t\t") + ";\n")
1273
1274             if return_type_info.to_hu_conv_name is not None:
1275                 out_java_struct += ("\t\treturn " + return_type_info.to_hu_conv_name + ";\n")
1276             elif return_type_info.java_ty != "void" and return_type_info.rust_obj != "LDK" + struct_meth:
1277                 out_java_struct += ("\t\treturn ret;\n")
1278             out_java_struct += ("\t}\n\n")
1279
1280         return (out_java, out_c, out_java_struct)
1281
1282     def cleanup(self):
1283         for struct in self.struct_file_suffixes:
1284             with open(self.outdir + "/structs/" + struct + self.file_ext, "a") as src:
1285                 src.write(self.struct_file_suffixes[struct])
1286
1287         with open(self.outdir + "/bindings.mts", "a") as bindings:
1288             bindings.write("""
1289
1290 js_invoke = function(obj_ptr: number, fn_id: number, arg1: number, arg2: number, arg3: number, arg4: number, arg5: number, arg6: number, arg7: number, arg8: number, arg9: number, arg10: number) {
1291         const weak: WeakRef<object> = js_objs[obj_ptr];
1292         if (weak == null || weak == undefined) {
1293                 console.error("Got function call on unknown/free'd JS object!");
1294                 throw new Error("Got function call on unknown/free'd JS object!");
1295         }
1296         const obj: object = weak.deref();
1297         if (obj == null || obj == undefined) {
1298                 console.error("Got function call on GC'd JS object!");
1299                 throw new Error("Got function call on GC'd JS object!");
1300         }
1301         var fn;
1302 """)
1303             bindings.write("\tswitch (fn_id) {\n")
1304             for f in self.function_ptrs:
1305                 bindings.write(f"\t\tcase {str(f)}: fn = Object.getOwnPropertyDescriptor(obj, \"{self.function_ptrs[f][1]}\"); break;\n")
1306
1307             bindings.write("""\t\tdefault:
1308                         console.error("Got unknown function call from C!");
1309                         throw new Error("Got unknown function call from C!");
1310         }
1311         if (fn == null || fn == undefined) {
1312                 console.error("Got function call on incorrect JS object!");
1313                 throw new Error("Got function call on incorrect JS object!");
1314         }
1315         return fn.value.bind(obj)(arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9, arg10);
1316 }""")