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

   1 from bindingstypes import ConvInfo
   2 from enum import Enum
   3
   4 def first_to_lower(string: str) -> str:
   5     first = string[0]
   6     return first.lower() + string[1:]
   7
   8
   9 class Target(Enum):
  10     NODEJS = 1,
  11     BROWSER = 2
  12
  13 class Consts:
  14     def __init__(self, DEBUG: bool, target: Target, **kwargs):
  15
  16         self.c_type_map = dict(
  17             uint8_t = ['number', 'Uint8Array'],
  18             uint16_t = ['number', 'Uint16Array'],
  19             uint32_t = ['number', 'Uint32Array'],
  20             long = ['number'],
  21         )
  22
  23         self.to_hu_conv_templates = dict(
  24             ptr = 'const {var_name}_hu_conv: {human_type} = new {human_type}(null, {var_name});',
  25             default = 'const {var_name}_hu_conv: {human_type} = new {human_type}(null, {var_name});',
  26         )
  27
  28         self.bindings_header = self.wasm_import_header(target) + """
  29 export class VecOrSliceDef {
  30     public dataptr: number;
  31     public datalen: number;
  32     public stride: number;
  33     public constructor(dataptr: number, datalen: number, stride: number) {
  34         this.dataptr = dataptr;
  35         this.datalen = datalen;
  36         this.stride = stride;
  37     }
  38 }
  39
  40 /*
  41 TODO: load WASM file
  42 static {
  43     System.loadLibrary(\"lightningjni\");
  44     init(java.lang.Enum.class, VecOrSliceDef.class);
  45     init_class_cache();
  46 }
  47
  48 static native void init(java.lang.Class c, java.lang.Class slicedef);
  49 static native void init_class_cache();
  50
  51 public static native boolean deref_bool(long ptr);
  52 public static native long deref_long(long ptr);
  53 public static native void free_heap_ptr(long ptr);
  54 public static native byte[] read_bytes(long ptr, long len);
  55 public static native byte[] get_u8_slice_bytes(long slice_ptr);
  56 public static native long bytes_to_u8_vec(byte[] bytes);
  57 public static native long new_txpointer_copy_data(byte[] txdata);
  58 public static native void txpointer_free(long ptr);
  59 public static native byte[] txpointer_get_buffer(long ptr);
  60 public static native long vec_slice_len(long vec);
  61 public static native long new_empty_slice_vec();
  62 */
  63
  64 """
  65
  66         self.common_base = """
  67             export default class CommonBase {
  68                 ptr: number;
  69                 ptrs_to: object[] = []; // new LinkedList(); TODO: build linked list implementation
  70                 protected constructor(ptr: number) { this.ptr = ptr; }
  71                 public _test_only_get_ptr(): number { return this.ptr; }
  72                 protected finalize() {
  73                     // TODO: finalize myself
  74                 }
  75             }
  76         """
  77
  78         self.c_file_pfx = """#include <rust_types.h>
  79 #include <stdatomic.h>
  80 #include <lightning.h>
  81
  82 // These should be provided...somehow...
  83 void *memset(void *s, int c, size_t n);
  84 void *memcpy(void *dest, const void *src, size_t n);
  85 int memcmp(const void *s1, const void *s2, size_t n);
  86
  87 void __attribute__((noreturn)) abort(void);
  88 void assert(scalar expression);
  89 """
  90
  91         if not DEBUG:
  92             self.c_file_pfx = self.c_file_pfx + """
  93 void *malloc(size_t size);
  94 void free(void *ptr);
  95
  96 #define MALLOC(a, _) malloc(a)
  97 #define FREE(p) if ((long)(p) > 1024) { free(p); }
  98 #define DO_ASSERT(a) (void)(a)
  99 #define CHECK(a)
 100 """
 101         else:
 102             self.c_file_pfx = self.c_file_pfx + """
 103 // Always run a, then assert it is true:
 104 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
 105 // Assert a is true or do nothing
 106 #define CHECK(a) DO_ASSERT(a)
 107
 108 // Running a leak check across all the allocations and frees of the JDK is a mess,
 109 // so instead we implement our own naive leak checker here, relying on the -wrap
 110 // linker option to wrap malloc/calloc/realloc/free, tracking everyhing allocated
 111 // and free'd in Rust or C across the generated bindings shared library.
 112
 113 #define BT_MAX 128
 114 typedef struct allocation {
 115         struct allocation* next;
 116         void* ptr;
 117         const char* struct_name;
 118 } allocation;
 119 static allocation* allocation_ll = NULL;
 120
 121 void* __real_malloc(size_t len);
 122 void* __real_calloc(size_t nmemb, size_t len);
 123 static void new_allocation(void* res, const char* struct_name) {
 124         allocation* new_alloc = __real_malloc(sizeof(allocation));
 125         new_alloc->ptr = res;
 126         new_alloc->struct_name = struct_name;
 127         new_alloc->next = allocation_ll;
 128         allocation_ll = new_alloc;
 129 }
 130 static void* MALLOC(size_t len, const char* struct_name) {
 131         void* res = __real_malloc(len);
 132         new_allocation(res, struct_name);
 133         return res;
 134 }
 135 void __real_free(void* ptr);
 136 static void alloc_freed(void* ptr) {
 137         allocation* p = NULL;
 138         allocation* it = allocation_ll;
 139         while (it->ptr != ptr) {
 140                 p = it; it = it->next;
 141                 if (it == NULL) {
 142                         //XXX: fprintf(stderr, "Tried to free unknown pointer %p\\n", ptr);
 143                         return; // addrsan should catch malloc-unknown and print more info than we have
 144                 }
 145         }
 146         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
 147         DO_ASSERT(it->ptr == ptr);
 148         __real_free(it);
 149 }
 150 static void FREE(void* ptr) {
 151         if ((long)ptr < 1024) return; // Rust loves to create pointers to the NULL page for dummys
 152         alloc_freed(ptr);
 153         __real_free(ptr);
 154 }
 155
 156 void* __wrap_malloc(size_t len) {
 157         void* res = __real_malloc(len);
 158         new_allocation(res, "malloc call");
 159         return res;
 160 }
 161 void* __wrap_calloc(size_t nmemb, size_t len) {
 162         void* res = __real_calloc(nmemb, len);
 163         new_allocation(res, "calloc call");
 164         return res;
 165 }
 166 void __wrap_free(void* ptr) {
 167         if (ptr == NULL) return;
 168         alloc_freed(ptr);
 169         __real_free(ptr);
 170 }
 171
 172 void* __real_realloc(void* ptr, size_t newlen);
 173 void* __wrap_realloc(void* ptr, size_t len) {
 174         if (ptr != NULL) alloc_freed(ptr);
 175         void* res = __real_realloc(ptr, len);
 176         new_allocation(res, "realloc call");
 177         return res;
 178 }
 179 void __wrap_reallocarray(void* ptr, size_t new_sz) {
 180         // Rust doesn't seem to use reallocarray currently
 181         DO_ASSERT(false);
 182 }
 183
 184 void __attribute__((destructor)) check_leaks() {
 185         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 186                 //XXX: fprintf(stderr, "%s %p remains\\n", a->struct_name, a->ptr);
 187         }
 188         DO_ASSERT(allocation_ll == NULL);
 189 }
 190 """
 191         self.c_file_pfx = self.c_file_pfx + """
 192 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
 193 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
 194 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
 195 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
 196
 197 _Static_assert(sizeof(void*) == 4, "Pointers mut be 32 bits");
 198
 199 typedef struct int64_tArray {uint32_t len;int64_t *ptr;} int64_tArray;
 200 typedef struct uint32_tArray {uint32_t len;int32_t *ptr;} uint32_tArray;
 201 typedef struct int8_tArray {uint32_t len;int8_t *ptr;} int8_tArray;
 202
 203 typedef bool jboolean;
 204
 205 """
 206
 207         self.hu_struct_file_prefix = f"""
 208 import CommonBase from './CommonBase';
 209 import * as bindings from '../bindings' // TODO: figure out location
 210
 211 """
 212         self.c_fn_ty_pfx = ""
 213         self.c_fn_name_pfx = ""
 214         self.c_fn_args_pfx = "void* ctx_TODO"
 215         self.file_ext = ".ts"
 216         self.ptr_c_ty = "uint32_t"
 217         self.ptr_native_ty = "uint32_t"
 218         self.result_c_ty = "uint32_t"
 219         self.ptr_arr = "uint32_tArray"
 220         self.get_native_arr_len_call = ("", ".len")
 221         self.get_native_arr_ptr_call = ("", ".ptr")
 222
 223     def release_native_arr_ptr_call(self, arr_var, arr_ptr_var):
 224         return None
 225     def create_native_arr_call(self, arr_len, ty_info):
 226         if ty_info.c_ty == "int8_tArray":
 227             return "{ .len = " + arr_len + ", .ptr = MALLOC(" + arr_len + ", \"Native " + ty_info.c_ty + " Bytes\") }"
 228         elif ty_info.c_ty == "int64_tArray":
 229             return "{ .len = " + arr_len + ", .ptr = MALLOC(" + arr_len + " * sizeof(int64_t), \"Native " + ty_info.c_ty + " Bytes\") }"
 230         elif ty_info.c_ty == "uint32_tArray":
 231             return "{ .len = " + arr_len + ", .ptr = MALLOC(" + arr_len + " * sizeof(int32_t), \"Native " + ty_info.c_ty + " Bytes\") }"
 232         else:
 233             print("Need to create arr!", ty_info.c_ty)
 234             return ty_info.c_ty
 235     def set_native_arr_contents(self, arr_name, arr_len, ty_info):
 236         if ty_info.c_ty == "int8_tArray":
 237             return ("memcpy(" + arr_name + ".ptr, ", ", " + arr_len + ")")
 238         else:
 239             assert False
 240     def get_native_arr_contents(self, arr_name, dest_name, arr_len, ty_info, copy):
 241         if ty_info.c_ty == "int8_tArray":
 242             if copy:
 243                 return "memcpy(" + dest_name + ", " + arr_name + ".ptr, " + arr_len + ")"
 244             else:
 245                 return arr_name + ".ptr"
 246         else:
 247             return "(" + ty_info.subty.c_ty + "*) " + arr_name + ".ptr"
 248     def get_native_arr_elem(self, arr_name, idxc, ty_info):
 249         assert False # Only called if above is None
 250     def cleanup_native_arr_ref_contents(self, arr_name, dest_name, arr_len, ty_info):
 251         if ty_info.c_ty == "int8_tArray":
 252             return None
 253         else:
 254             return None
 255
 256
 257     def wasm_import_header(self, target):
 258         if target == Target.NODEJS:
 259             return """
 260 const path = require('path').join(__dirname, 'bindings.wasm');
 261 const bytes = require('fs').readFileSync(path);
 262 let imports = {};
 263 // add all exports to dictionary and move down?
 264 // use `module.exports`?
 265 // imports['./bindings.js'] = require('./bindings.js');
 266
 267 const wasmModule = new WebAssembly.Module(bytes);
 268 const wasmInstance = new WebAssembly.Instance(wasmModule, imports);
 269 // module.exports = wasmInstance.exports;
 270 const wasm = wasmInstance.exports;
 271             """
 272         return ''
 273
 274     def init_str(self, c_array_class_caches):
 275         return ""
 276
 277     def native_c_unitary_enum_map(self, struct_name, variants):
 278         out_c = "static inline " + struct_name + " " + struct_name + "_from_js(int32_t ord) {\n"
 279         out_c = out_c + "\tswitch (ord) {\n"
 280         ord_v = 0
 281
 282         out_typescript_enum_fields = ""
 283
 284         for var in variants:
 285             out_c = out_c + "\t\tcase %d: return %s;\n" % (ord_v, var)
 286             ord_v = ord_v + 1
 287             out_typescript_enum_fields += f"{var},\n\t\t\t\t"
 288         out_c = out_c + "\t}\n"
 289         out_c = out_c + "\tabort();\n"
 290         out_c = out_c + "}\n"
 291
 292         out_c = out_c + "static inline int32_t " + struct_name + "_to_js(" + struct_name + " val) {\n"
 293         out_c = out_c + "\tswitch (val) {\n"
 294         ord_v = 0
 295         for var in variants:
 296             out_c = out_c + "\t\tcase " + var + ": return %d;\n" % ord_v
 297             ord_v = ord_v + 1
 298         out_c = out_c + "\t\tdefault: abort();\n"
 299         out_c = out_c + "\t}\n"
 300         out_c = out_c + "}\n"
 301
 302         out_typescript_enum = f"""
 303             export enum {struct_name} {{
 304                 {out_typescript_enum_fields}
 305             }}
 306         """
 307
 308         return (out_c, out_typescript_enum, "")
 309
 310     def c_unitary_enum_to_native_call(self, ty_info):
 311         return (ty_info.rust_obj + "_to_js(", ")")
 312     def native_unitary_enum_to_c_call(self, ty_info):
 313         return (ty_info.rust_obj + "_from_js(", ")")
 314
 315     def c_complex_enum_pass_ty(self, struct_name):
 316         return "uint32_t"
 317
 318     def c_constr_native_complex_enum(self, struct_name, variant, c_params):
 319         ret = "0 /* " + struct_name + " - " + variant + " */"
 320         for param in c_params:
 321             ret = ret + "; (void) " + param
 322         return ret
 323
 324     def native_c_map_trait(self, struct_name, field_var_conversions, field_function_lines):
 325         out_typescript_bindings = "\n\n\n// OUT_TYPESCRIPT_BINDINGS :: MAP_TRAIT :: START\n\n"
 326
 327         constructor_arguments = ""
 328         super_instantiator = ""
 329         pointer_to_adder = ""
 330         impl_constructor_arguments = ""
 331         for var in field_var_conversions:
 332             if isinstance(var, ConvInfo):
 333                 constructor_arguments += f", {first_to_lower(var.arg_name)}?: {var.java_hu_ty}"
 334                 impl_constructor_arguments += f", {var.arg_name}: {var.java_hu_ty}"
 335                 if var.from_hu_conv is not None:
 336                     super_instantiator += ", " + var.from_hu_conv[0]
 337                     if var.from_hu_conv[1] != "":
 338                         pointer_to_adder += var.from_hu_conv[1] + ";\n"
 339                 else:
 340                     super_instantiator += ", " + first_to_lower(var.arg_name)
 341             else:
 342                 constructor_arguments += f", {first_to_lower(var[1])}?: bindings.{var[0]}"
 343                 super_instantiator += ", " + first_to_lower(var[1])
 344                 pointer_to_adder += "this.ptrs_to.push(" + first_to_lower(var[1]) + ");\n"
 345                 impl_constructor_arguments += f", {first_to_lower(var[1])}_impl: {var[0].replace('LDK', '')}.{var[0].replace('LDK', '')}Interface"
 346
 347         # BUILD INTERFACE METHODS
 348         out_java_interface = ""
 349         out_interface_implementation_overrides = ""
 350         java_methods = []
 351         for fn_line in field_function_lines:
 352             java_method_descriptor = ""
 353             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 354                 out_java_interface += fn_line.fn_name + "("
 355                 out_interface_implementation_overrides += f"{fn_line.fn_name} ("
 356
 357                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 358                     if idx >= 1:
 359                         out_java_interface += ", "
 360                         out_interface_implementation_overrides += ", "
 361                     out_java_interface += f"{arg_conv_info.arg_name}: {arg_conv_info.java_hu_ty}"
 362                     out_interface_implementation_overrides += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
 363                     java_method_descriptor += arg_conv_info.java_fn_ty_arg
 364                 out_java_interface += f"): {fn_line.ret_ty_info.java_hu_ty};\n\t\t\t\t"
 365                 java_method_descriptor += ")" + fn_line.ret_ty_info.java_fn_ty_arg
 366                 java_methods.append((fn_line.fn_name, java_method_descriptor))
 367
 368                 out_interface_implementation_overrides += f"): {fn_line.ret_ty_info.java_ty} {{\n"
 369
 370                 interface_method_override_inset = "\t\t\t\t\t\t"
 371                 interface_implementation_inset = "\t\t\t\t\t\t\t"
 372                 for arg_info in fn_line.args_ty:
 373                     if arg_info.to_hu_conv is not None:
 374                         out_interface_implementation_overrides += interface_implementation_inset + arg_info.to_hu_conv.replace("\n", "\n\t\t\t\t") + "\n"
 375
 376                 if fn_line.ret_ty_info.java_ty != "void":
 377                     out_interface_implementation_overrides += interface_implementation_inset + fn_line.ret_ty_info.java_hu_ty + " ret = arg." + fn_line.fn_name + "("
 378                 else:
 379                     out_interface_implementation_overrides += f"{interface_implementation_inset}arg." + fn_line.fn_name + "("
 380
 381                 for idx, arg_info in enumerate(fn_line.args_ty):
 382                     if idx != 0:
 383                         out_interface_implementation_overrides += ", "
 384                     if arg_info.to_hu_conv_name is not None:
 385                         out_interface_implementation_overrides += arg_info.to_hu_conv_name
 386                     else:
 387                         out_interface_implementation_overrides += arg_info.arg_name
 388
 389                 out_interface_implementation_overrides += ");\n"
 390                 if fn_line.ret_ty_info.java_ty != "void":
 391                     if fn_line.ret_ty_info.from_hu_conv is not None:
 392                         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"
 393                         if fn_line.ret_ty_info.from_hu_conv[1] != "":
 394                             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"
 395                         #if fn_line.ret_ty_info.rust_obj in result_types:
 396                         # XXX: We need to handle this in conversion logic so that its cross-language!
 397                         # Avoid double-free by breaking the result - we should learn to clone these and then we can be safe instead
 398                         #    out_interface_implementation_overrides = out_interface_implementation_overrides + "\t\t\t\tret.ptr = 0;\n"
 399                         out_interface_implementation_overrides = out_interface_implementation_overrides + "\t\t\t\treturn result;\n"
 400                     else:
 401                         out_interface_implementation_overrides = out_interface_implementation_overrides + "\t\t\t\treturn ret;\n"
 402                 out_interface_implementation_overrides += f"{interface_method_override_inset}}},\n\n{interface_method_override_inset}"
 403
 404         trait_constructor_arguments = ""
 405         for var in field_var_conversions:
 406             if isinstance(var, ConvInfo):
 407                 trait_constructor_arguments += ", " + var.arg_name
 408             else:
 409                 trait_constructor_arguments += ", " + var[1] + ".new_impl(" + var[1] + "_impl).bindings_instance"
 410
 411
 412
 413         out_typescript_human = f"""
 414             {self.hu_struct_file_prefix}
 415
 416             export class {struct_name.replace("LDK","")} extends CommonBase {{
 417
 418                 bindings_instance?: bindings.{struct_name};
 419
 420                 constructor(ptr?: number, arg?: bindings.{struct_name}{constructor_arguments}) {{
 421                     if (Number.isFinite(ptr)) {{
 422                                         super(ptr);
 423                                         this.bindings_instance = null;
 424                                     }} else {{
 425                                         // TODO: private constructor instantiation
 426                                         super(bindings.{struct_name}_new(arg{super_instantiator}));
 427                                         this.ptrs_to.push(arg);
 428                                         {pointer_to_adder}
 429                                     }}
 430                 }}
 431
 432                 protected finalize() {{
 433                     if (this.ptr != 0) {{
 434                         bindings.{struct_name.replace("LDK","")}_free(this.ptr);
 435                     }}
 436                     super.finalize();
 437                 }}
 438
 439                 static new_impl(arg: {struct_name.replace("LDK", "")}Interface{impl_constructor_arguments}): {struct_name.replace("LDK", "")} {{
 440                     const impl_holder: {struct_name}Holder = new {struct_name}Holder();
 441                     let structImplementation = <bindings.{struct_name}>{{
 442
 443                         // todo: in-line interface filling
 444
 445                         {out_interface_implementation_overrides}
 446                     }};
 447                     impl_holder.held = new {struct_name.replace("LDK", "")} (null, structImplementation{trait_constructor_arguments});
 448                 }}
 449
 450             }}
 451
 452             export interface {struct_name.replace("LDK", "")}Interface {{
 453                 {out_java_interface}
 454             }}
 455
 456             class {struct_name}Holder {{
 457                 held: {struct_name.replace("LDK", "")};
 458             }}
 459
 460         """
 461
 462
 463
 464         out_typescript_bindings += "\t\texport interface " + struct_name + " {\n"
 465         java_meths = []
 466         for fn_line in field_function_lines:
 467             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 468                 out_typescript_bindings += f"\t\t\t{fn_line.fn_name} ("
 469
 470                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 471                     if idx >= 1:
 472                         out_typescript_bindings = out_typescript_bindings + ", "
 473                     out_typescript_bindings += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
 474
 475                 out_typescript_bindings += f"): {fn_line.ret_ty_info.java_ty};\n"
 476
 477         out_typescript_bindings = out_typescript_bindings + "\t\t}\n\n"
 478
 479         out_typescript_bindings += f"\t\texport function {struct_name}_new(impl: {struct_name}"
 480         for var in field_var_conversions:
 481             if isinstance(var, ConvInfo):
 482                 out_typescript_bindings += f", {var.arg_name}: {var.java_ty}"
 483             else:
 484                 out_typescript_bindings += f", {var[1]}: {var[0]}"
 485
 486         out_typescript_bindings += f"""): number {{
 487             throw new Error('unimplemented'); // TODO: bind to WASM
 488         }}
 489
 490         export function {struct_name}_get_obj_from_jcalls(val: number): {struct_name} {{
 491             throw new Error('unimplemented'); // TODO: bind to WASM
 492         }}
 493         """
 494
 495         out_typescript_bindings += '\n// OUT_TYPESCRIPT_BINDINGS :: MAP_TRAIT :: END\n\n\n'
 496
 497         # Now that we've written out our java code (and created java_meths), generate C
 498         out_c = "typedef struct " + struct_name + "_JCalls {\n"
 499         out_c = out_c + "\tatomic_size_t refcnt;\n"
 500         out_c = out_c + "\tJavaVM *vm;\n"
 501         out_c = out_c + "\tjweak o;\n"
 502         for var in field_var_conversions:
 503             if isinstance(var, ConvInfo):
 504                 # We're a regular ol' field
 505                 pass
 506             else:
 507                 # We're a supertrait
 508                 out_c = out_c + "\t" + var[0] + "_JCalls* " + var[1] + ";\n"
 509         for fn in field_function_lines:
 510             if fn.fn_name != "free" and fn.fn_name != "clone":
 511                 out_c = out_c + "\tjmethodID " + fn.fn_name + "_meth;\n"
 512         out_c = out_c + "} " + struct_name + "_JCalls;\n"
 513
 514         for fn_line in field_function_lines:
 515             if fn_line.fn_name == "free":
 516                 out_c = out_c + "static void " + struct_name + "_JCalls_free(void* this_arg) {\n"
 517                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 518                 out_c = out_c + "\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n"
 519                 out_c = out_c + "\t\tJNIEnv *env;\n"
 520                 out_c = out_c + "\t\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_8) == JNI_OK);\n"
 521                 out_c = out_c + "\t\t(*env)->DeleteWeakGlobalRef(env, j_calls->o);\n"
 522                 out_c = out_c + "\t\tFREE(j_calls);\n"
 523                 out_c = out_c + "\t}\n}\n"
 524
 525         for idx, fn_line in enumerate(field_function_lines):
 526             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 527                 assert fn_line.ret_ty_info.ty_info.get_full_rust_ty()[1] == ""
 528                 out_c = out_c + fn_line.ret_ty_info.ty_info.get_full_rust_ty()[0] + " " + fn_line.fn_name + "_jcall("
 529                 if fn_line.self_is_const:
 530                     out_c = out_c + "const void* this_arg"
 531                 else:
 532                     out_c = out_c + "void* this_arg"
 533
 534                 for idx, arg in enumerate(fn_line.args_ty):
 535                     out_c = out_c + ", " + arg.ty_info.get_full_rust_ty()[0] + " " + arg.arg_name + arg.ty_info.get_full_rust_ty()[1]
 536
 537                 out_c = out_c + ") {\n"
 538                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 539                 out_c = out_c + "\tJNIEnv *env;\n"
 540                 out_c = out_c + "\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_8) == JNI_OK);\n"
 541
 542                 for arg_info in fn_line.args_ty:
 543                     if arg_info.ret_conv is not None:
 544                         out_c = out_c + "\t" + arg_info.ret_conv[0].replace('\n', '\n\t')
 545                         out_c = out_c + arg_info.arg_name
 546                         out_c = out_c + arg_info.ret_conv[1].replace('\n', '\n\t') + "\n"
 547
 548                 out_c = out_c + "\tjobject obj = (*env)->NewLocalRef(env, j_calls->o);\n\tCHECK(obj != NULL);\n"
 549                 if fn_line.ret_ty_info.c_ty.endswith("Array"):
 550                     out_c = out_c + "\t" + fn_line.ret_ty_info.c_ty + " arg = (*env)->CallObjectMethod(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 551                 elif not fn_line.ret_ty_info.passed_as_ptr:
 552                     out_c = out_c + "\treturn (*env)->Call" + fn_line.ret_ty_info.java_ty.title() + "Method(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 553                 else:
 554                     out_c = out_c + "\t" + fn_line.ret_ty_info.rust_obj + "* ret = (" + fn_line.ret_ty_info.rust_obj + "*)(*env)->CallLongMethod(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 555
 556                 for idx, arg_info in enumerate(fn_line.args_ty):
 557                     if arg_info.ret_conv is not None:
 558                         out_c = out_c + ", " + arg_info.ret_conv_name
 559                     else:
 560                         out_c = out_c + ", " + arg_info.arg_name
 561                 out_c = out_c + ");\n"
 562                 if fn_line.ret_ty_info.arg_conv is not None:
 563                     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"
 564
 565                 out_c = out_c + "}\n"
 566
 567         # Write out a clone function whether we need one or not, as we use them in moving to rust
 568         out_c = out_c + "static void* " + struct_name + "_JCalls_clone(const void* this_arg) {\n"
 569         out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 570         out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n"
 571         for var in field_var_conversions:
 572             if not isinstance(var, ConvInfo):
 573                 out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->" + var[1] + "->refcnt, 1, memory_order_release);\n"
 574         out_c = out_c + "\treturn (void*) this_arg;\n"
 575         out_c = out_c + "}\n"
 576
 577         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_init (" + self.c_fn_args_pfx + ", jobject o"
 578         for var in field_var_conversions:
 579             if isinstance(var, ConvInfo):
 580                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 581             else:
 582                 out_c = out_c + ", jobject " + var[1]
 583         out_c = out_c + ") {\n"
 584
 585         out_c = out_c + "\tjclass c = (*env)->GetObjectClass(env, o);\n"
 586         out_c = out_c + "\tCHECK(c != NULL);\n"
 587         out_c = out_c + "\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n"
 588         out_c = out_c + "\tatomic_init(&calls->refcnt, 1);\n"
 589         out_c = out_c + "\tDO_ASSERT((*env)->GetJavaVM(env, &calls->vm) == 0);\n"
 590         out_c = out_c + "\tcalls->o = (*env)->NewWeakGlobalRef(env, o);\n"
 591
 592         for (fn_name, java_meth_descr) in java_meths:
 593             if fn_name != "free" and fn_name != "clone":
 594                 out_c = out_c + "\tcalls->" + fn_name + "_meth = (*env)->GetMethodID(env, c, \"" + fn_name + "\", \"" + java_meth_descr + "\");\n"
 595                 out_c = out_c + "\tCHECK(calls->" + fn_name + "_meth != NULL);\n"
 596
 597         for var in field_var_conversions:
 598             if isinstance(var, ConvInfo) and var.arg_conv is not None:
 599                 out_c = out_c + "\n\t" + var.arg_conv.replace("\n", "\n\t") +"\n"
 600         out_c = out_c + "\n\t" + struct_name + " ret = {\n"
 601         out_c = out_c + "\t\t.this_arg = (void*) calls,\n"
 602         for fn_line in field_function_lines:
 603             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 604                 out_c = out_c + "\t\t." + fn_line.fn_name + " = " + fn_line.fn_name + "_jcall,\n"
 605             elif fn_line.fn_name == "free":
 606                 out_c = out_c + "\t\t.free = " + struct_name + "_JCalls_free,\n"
 607             else:
 608                 out_c = out_c + "\t\t.clone = " + struct_name + "_JCalls_clone,\n"
 609         for var in field_var_conversions:
 610             if isinstance(var, ConvInfo):
 611                 if var.arg_conv_name is not None:
 612                     out_c = out_c + "\t\t." + var.arg_name + " = " + var.arg_conv_name + ",\n"
 613                     out_c = out_c + "\t\t.set_" + var.arg_name + " = NULL,\n"
 614                 else:
 615                     out_c = out_c + "\t\t." + var.var_name + " = " + var.var_name + ",\n"
 616                     out_c = out_c + "\t\t.set_" + var.var_name + " = NULL,\n"
 617             else:
 618                 out_c = out_c + "\t\t." + var[1] + " = " + var[0] + "_init(env, clz, " + var[1] + "),\n"
 619         out_c = out_c + "\t};\n"
 620         for var in field_var_conversions:
 621             if not isinstance(var, ConvInfo):
 622                 out_c = out_c + "\tcalls->" + var[1] + " = ret." + var[1] + ".this_arg;\n"
 623         out_c = out_c + "\treturn ret;\n"
 624         out_c = out_c + "}\n"
 625
 626         out_c = out_c + self.c_fn_ty_pfx + "long " + self.c_fn_name_pfx + struct_name.replace("_", "_1") + "_1new (" + self.c_fn_args_pfx + ", jobject o"
 627         for var in field_var_conversions:
 628             if isinstance(var, ConvInfo):
 629                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 630             else:
 631                 out_c = out_c + ", jobject " + var[1]
 632         out_c = out_c + ") {\n"
 633         out_c = out_c + "\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n"
 634         out_c = out_c + "\t*res_ptr = " + struct_name + "_init(env, clz, o"
 635         for var in field_var_conversions:
 636             if isinstance(var, ConvInfo):
 637                 out_c = out_c + ", " + var.arg_name
 638             else:
 639                 out_c = out_c + ", " + var[1]
 640         out_c = out_c + ");\n"
 641         out_c = out_c + "\treturn (long)res_ptr;\n"
 642         out_c = out_c + "}\n"
 643
 644         out_c = out_c + self.c_fn_ty_pfx + "jobject " + self.c_fn_name_pfx + struct_name.replace("_", "_1") + "_1get_1obj_1from_1jcalls (" + self.c_fn_args_pfx + ", " + self.ptr_c_ty + " val) {\n"
 645         out_c = out_c + "\tjobject ret = (*env)->NewLocalRef(env, ((" + struct_name + "_JCalls*)val)->o);\n"
 646         out_c = out_c + "\tCHECK(ret != NULL);\n"
 647         out_c = out_c + "\treturn ret;\n"
 648         out_c = out_c + "}\n"
 649
 650
 651         return (out_typescript_bindings, out_typescript_human, out_c)
 652
 653     def map_complex_enum(self, struct_name, variant_list, camel_to_snake):
 654         java_hu_type = struct_name.replace("LDK", "")
 655
 656         out_java_enum = ""
 657         out_java = ""
 658         out_c = ""
 659
 660         out_java_enum += (self.hu_struct_file_prefix)
 661         out_java_enum += ("export default class " + java_hu_type + " extends CommonBase {\n")
 662         out_java_enum += ("\tprotected constructor(_dummy: object, ptr: number) { super(ptr); }\n")
 663         out_java_enum += ("\tprotected finalize() {\n")
 664         out_java_enum += ("\t\tsuper.finalize();\n")
 665         out_java_enum += ("\t\tif (this.ptr != 0) { bindings." + java_hu_type + "_free(this.ptr); }\n")
 666         out_java_enum += ("\t}\n")
 667         out_java_enum += f"\tstatic constr_from_ptr(ptr: number): {java_hu_type} {{\n"
 668         out_java_enum += (f"\t\tconst raw_val: bindings.{struct_name} = bindings." + struct_name + "_ref_from_ptr(ptr);\n")
 669         java_hu_subclasses = ""
 670
 671         out_java +=  ("\tpublic static class " + struct_name + " {\n")
 672         out_java +=  ("\t\tprivate " + struct_name + "() {}\n")
 673         for var in variant_list:
 674             out_java +=  ("\t\texport class " + var.var_name + " extends " + struct_name + " {\n")
 675             java_hu_subclasses = java_hu_subclasses + "export class " + var.var_name + " extends " + java_hu_type + " {\n"
 676             out_java_enum += ("\t\tif (raw_val instanceof bindings." + struct_name + "." + var.var_name + ") {\n")
 677             out_java_enum += ("\t\t\treturn new " + var.var_name + "(this.ptr, raw_val);\n")
 678             init_meth_params = ""
 679             init_meth_body = ""
 680             hu_conv_body = ""
 681             for idx, field_ty in enumerate(var.fields):
 682                 out_java += ("\t\t\tpublic " + field_ty.java_ty + " " + field_ty.arg_name + ";\n")
 683                 java_hu_subclasses = java_hu_subclasses + "\tpublic " + field_ty.arg_name + f": {field_ty.java_hu_ty};\n"
 684                 if field_ty.to_hu_conv is not None:
 685                     hu_conv_body = hu_conv_body + "\t\tconst " + field_ty.arg_name + f": {field_ty.java_ty} = obj." + field_ty.arg_name + ";\n"
 686                     hu_conv_body = hu_conv_body + "\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
 687                     hu_conv_body = hu_conv_body + "\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
 688                 else:
 689                     hu_conv_body = hu_conv_body + "\t\tthis." + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
 690                 if idx > 0:
 691                     init_meth_params = init_meth_params + ", "
 692                 init_meth_params = init_meth_params + field_ty.java_ty + " " + field_ty.arg_name
 693                 init_meth_body = init_meth_body + "this." + field_ty.arg_name + " = " + field_ty.arg_name + "; "
 694             out_java +=  ("\t\t\t" + var.var_name + "(" + init_meth_params + ") { ")
 695             out_java +=  (init_meth_body)
 696             out_java +=  ("}\n")
 697             out_java += ("\t\t}\n")
 698             out_java_enum += ("\t\t}\n")
 699             java_hu_subclasses = java_hu_subclasses + "\tprivate constructor(ptr: number, obj: bindings." + struct_name + "." + var.var_name + ") {\n\t\tsuper(null, ptr);\n"
 700             java_hu_subclasses = java_hu_subclasses + hu_conv_body
 701             java_hu_subclasses = java_hu_subclasses + "\t}\n}\n"
 702         out_java += ("\t\tstatic native void init();\n")
 703         out_java += ("\t}\n")
 704         out_java_enum += ("\t\tthrow new Error('oops, this should be unreachable'); // Unreachable without extending the (internal) bindings interface\n\t}\n\n")
 705         out_java += ("\tstatic { " + struct_name + ".init(); }\n")
 706         out_java += ("\tpublic static native " + struct_name + " " + struct_name + "_ref_from_ptr(long ptr);\n");
 707
 708         out_c += (self.c_fn_ty_pfx + self.c_complex_enum_pass_ty(struct_name) + " " + self.c_fn_name_pfx + struct_name.replace("_", "_1") + "_1ref_1from_1ptr (" + self.c_fn_args_pfx + ", " + self.ptr_c_ty + " ptr) {\n")
 709         out_c += ("\t" + struct_name + " *obj = (" + struct_name + "*)ptr;\n")
 710         out_c += ("\tswitch(obj->tag) {\n")
 711         for var in variant_list:
 712             out_c += ("\t\tcase " + struct_name + "_" + var.var_name + ": {\n")
 713             c_params = []
 714             for idx, field_map in enumerate(var.fields):
 715                 if field_map.ret_conv is not None:
 716                     out_c += ("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
 717                     out_c += ("obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name)
 718                     out_c += (field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
 719                     c_params.append(field_map.ret_conv_name)
 720                 else:
 721                     c_params.append("obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name)
 722             out_c += ("\t\t\treturn " + self.c_constr_native_complex_enum(struct_name, var.var_name, c_params) + ";\n")
 723             out_c += ("\t\t}\n")
 724         out_c += ("\t\tdefault: abort();\n")
 725         out_c += ("\t}\n}\n")
 726         out_java_enum += ("}\n")
 727         out_java_enum += (java_hu_subclasses)
 728         return (out_java, out_java_enum, out_c)
 729
 730     def map_opaque_struct(self, struct_name):
 731
 732         implementations = ""
 733         method_header = ""
 734         if struct_name.startswith("LDKLocked"):
 735             implementations += "implements AutoCloseable "
 736             method_header = """
 737                 public close() {
 738             """
 739         else:
 740             method_header = """
 741                 protected finalize() {
 742                     super.finalize();
 743             """
 744
 745         out_opaque_struct_human = f"""
 746             {self.hu_struct_file_prefix}
 747
 748             export default class {struct_name.replace("LDK","")} extends CommonBase {implementations}{{
 749                 constructor(_dummy: object, ptr: number) {{
 750                     super(ptr);
 751                 }}
 752
 753                 {method_header}
 754                     if (this.ptr != 0) {{
 755                         bindings.{struct_name.replace("LDK","")}_free(this.ptr);
 756                     }}
 757                 }}
 758         """
 759         return out_opaque_struct_human