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

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