_ 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         for var in field_var_conversions:
 272             if isinstance(var, ConvInfo):
 273                 constructor_arguments += f", {first_to_lower(var.arg_name)}?: {var.java_hu_ty}"
 274                 if var.from_hu_conv is not None:
 275                     super_instantiator += ", " + var.from_hu_conv[0]
 276                     if var.from_hu_conv[1] != "":
 277                         pointer_to_adder += var.from_hu_conv[1] + ";\n"
 278                 else:
 279                     super_instantiator += ", " + first_to_lower(var.arg_name)
 280             else:
 281                 constructor_arguments += f", {first_to_lower(var[1])}?: bindings.{var[0]}"
 282                 super_instantiator += ", " + first_to_lower(var[1])
 283                 pointer_to_adder += "this.ptrs_to.push(" + first_to_lower(var[1]) + ");\n"
 284
 285         # BUILD INTERFACE METHODS
 286         out_java_interface = ""
 287         for fn_line in field_function_lines:
 288             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 289                 out_java_interface += fn_line.fn_name + "("
 290
 291                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 292                     if idx >= 1:
 293                         out_java_interface += ", "
 294                     out_java_interface += f"{arg_conv_info.arg_name}: {arg_conv_info.java_hu_ty}"
 295                 out_java_interface += f"): {fn_line.ret_ty_info.java_hu_ty};\n\t\t\t\t"
 296
 297         out_java_trait = f"""
 298             {self.hu_struct_file_prefix}
 299
 300             export class {struct_name.replace("LDK","")} extends CommonBase {{
 301
 302                 bindings_instance?: bindings.{struct_name};
 303
 304                 constructor(ptr?: number, arg?: bindings.{struct_name}{constructor_arguments}) {{
 305                     if (Number.isFinite(ptr)) {{
 306                                         super(ptr);
 307                                         this.bindings_instance = null;
 308                                     }} else {{
 309                                         // TODO: private constructor instantiation
 310                                         super(bindings.{struct_name}_new(arg{super_instantiator}));
 311                                         this.ptrs_to.push(arg);
 312                                         {pointer_to_adder}
 313                                     }}
 314                 }}
 315
 316                 protected finalize() {{
 317                     if (this.ptr != 0) {{
 318                         bindings.{struct_name.replace("LDK","")}_free(this.ptr);
 319                     }}
 320                     super.finalize();
 321                 }}
 322
 323             }}
 324
 325             export interface {struct_name.replace("LDK", "")}Interface {{
 326                 {out_java_interface}
 327             }}
 328         """
 329
 330
 331
 332         java_trait_constr = "\tprivate static class " + struct_name + "Holder { " + struct_name.replace("LDK", "") + " held; }\n"
 333         java_trait_constr = java_trait_constr + "\tpublic static " + struct_name.replace("LDK", "") + " new_impl(" + struct_name.replace("LDK", "") + "Interface arg"
 334         for var in field_var_conversions:
 335             if isinstance(var, ConvInfo):
 336                 java_trait_constr = java_trait_constr + ", " + var.java_hu_ty + " " + var.arg_name
 337             else:
 338                 # Ideally we'd be able to take any instance of the interface, but our C code can only represent
 339                 # Java-implemented version, so we require users pass a Java implementation here :/
 340                 java_trait_constr = java_trait_constr + ", " + var[0].replace("LDK", "") + "." + var[0].replace("LDK", "") + "Interface " + var[1] + "_impl"
 341         java_trait_constr = java_trait_constr + ") {\n\t\tfinal " + struct_name + "Holder impl_holder = new " + struct_name + "Holder();\n"
 342         java_trait_constr = java_trait_constr + "\t\timpl_holder.held = new " + struct_name.replace("LDK", "") + "(new bindings." + struct_name + "() {\n"
 343         out_java_trait = out_java_trait + "\tpublic static interface " + struct_name.replace("LDK", "") + "Interface {\n"
 344         out_java = out_java + "\tpublic interface " + struct_name + " {\n"
 345         java_meths = []
 346         for fn_line in field_function_lines:
 347             java_meth_descr = "("
 348             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 349                 out_java = out_java + "\t\t " + fn_line.ret_ty_info.java_ty + " " + fn_line.fn_name + "("
 350                 java_trait_constr = java_trait_constr + "\t\t\t@Override public " + fn_line.ret_ty_info.java_ty + " " + fn_line.fn_name + "("
 351                 out_java_trait = out_java_trait + "\t\t" + fn_line.ret_ty_info.java_hu_ty + " " + fn_line.fn_name + "("
 352
 353                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 354                     if idx >= 1:
 355                         out_java = out_java + ", "
 356                         java_trait_constr = java_trait_constr + ", "
 357                         out_java_trait = out_java_trait + ", "
 358                     out_java = out_java + arg_conv_info.java_ty + " " + arg_conv_info.arg_name
 359                     out_java_trait = out_java_trait + arg_conv_info.java_hu_ty + " " + arg_conv_info.arg_name
 360                     java_trait_constr = java_trait_constr + arg_conv_info.java_ty + " " + arg_conv_info.arg_name
 361                     java_meth_descr = java_meth_descr + arg_conv_info.java_fn_ty_arg
 362                 java_meth_descr = java_meth_descr + ")" + fn_line.ret_ty_info.java_fn_ty_arg
 363                 java_meths.append((fn_line.fn_name, java_meth_descr))
 364
 365                 out_java = out_java + ");\n"
 366                 out_java_trait = out_java_trait + ");\n"
 367                 java_trait_constr = java_trait_constr + ") {\n"
 368
 369                 for arg_info in fn_line.args_ty:
 370                     if arg_info.to_hu_conv is not None:
 371                         java_trait_constr = java_trait_constr + "\t\t\t\t" + arg_info.to_hu_conv.replace("\n", "\n\t\t\t\t") + "\n"
 372
 373                 if fn_line.ret_ty_info.java_ty != "void":
 374                     java_trait_constr = java_trait_constr + "\t\t\t\t" + fn_line.ret_ty_info.java_hu_ty + " ret = arg." + fn_line.fn_name + "("
 375                 else:
 376                     java_trait_constr = java_trait_constr + "\t\t\t\targ." + fn_line.fn_name + "("
 377
 378                 for idx, arg_info in enumerate(fn_line.args_ty):
 379                     if idx != 0:
 380                         java_trait_constr = java_trait_constr + ", "
 381                     if arg_info.to_hu_conv_name is not None:
 382                         java_trait_constr = java_trait_constr + arg_info.to_hu_conv_name
 383                     else:
 384                         java_trait_constr = java_trait_constr + arg_info.arg_name
 385
 386                 java_trait_constr = java_trait_constr + ");\n"
 387                 if fn_line.ret_ty_info.java_ty != "void":
 388                     if fn_line.ret_ty_info.from_hu_conv is not None:
 389                         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"
 390                         if fn_line.ret_ty_info.from_hu_conv[1] != "":
 391                             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"
 392                         #if fn_line.ret_ty_info.rust_obj in result_types:
 393                         # XXX: We need to handle this in conversion logic so that its cross-language!
 394                         # Avoid double-free by breaking the result - we should learn to clone these and then we can be safe instead
 395                         #    java_trait_constr = java_trait_constr + "\t\t\t\tret.ptr = 0;\n"
 396                         java_trait_constr = java_trait_constr + "\t\t\t\treturn result;\n"
 397                     else:
 398                         java_trait_constr = java_trait_constr + "\t\t\t\treturn ret;\n"
 399                 java_trait_constr = java_trait_constr + "\t\t\t}\n"
 400         java_trait_constr = java_trait_constr + "\t\t}"
 401         for var in field_var_conversions:
 402             if isinstance(var, ConvInfo):
 403                 java_trait_constr = java_trait_constr + ", " + var.arg_name
 404             else:
 405                 java_trait_constr = java_trait_constr + ", " + var[1] + ".new_impl(" + var[1] + "_impl).bindings_instance"
 406         out_java_trait = out_java_trait + "\t}\n"
 407         out_java_trait = out_java_trait + java_trait_constr + ");\n\t\treturn impl_holder.held;\n\t}\n"
 408
 409         print(java_trait_constr)
 410
 411         out_java = out_java + "\t}\n"
 412
 413         out_java = out_java + "\tpublic static native long " + struct_name + "_new(" + struct_name + " impl"
 414         for var in field_var_conversions:
 415             if isinstance(var, ConvInfo):
 416                 out_java = out_java + ", " + var.java_ty + " " + var.arg_name
 417             else:
 418                 out_java = out_java + ", " + var[0] + " " + var[1]
 419         out_java = out_java + ");\n"
 420         out_java = out_java + "\tpublic static native " + struct_name + " " + struct_name + "_get_obj_from_jcalls(long val);\n"
 421
 422         # Now that we've written out our java code (and created java_meths), generate C
 423         out_c = "typedef struct " + struct_name + "_JCalls {\n"
 424         out_c = out_c + "\tatomic_size_t refcnt;\n"
 425         out_c = out_c + "\tJavaVM *vm;\n"
 426         out_c = out_c + "\tjweak o;\n"
 427         for var in field_var_conversions:
 428             if isinstance(var, ConvInfo):
 429                 # We're a regular ol' field
 430                 pass
 431             else:
 432                 # We're a supertrait
 433                 out_c = out_c + "\t" + var[0] + "_JCalls* " + var[1] + ";\n"
 434         for fn in field_function_lines:
 435             if fn.fn_name != "free" and fn.fn_name != "clone":
 436                 out_c = out_c + "\tjmethodID " + fn.fn_name + "_meth;\n"
 437         out_c = out_c + "} " + struct_name + "_JCalls;\n"
 438
 439         for fn_line in field_function_lines:
 440             if fn_line.fn_name == "free":
 441                 out_c = out_c + "static void " + struct_name + "_JCalls_free(void* this_arg) {\n"
 442                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 443                 out_c = out_c + "\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n"
 444                 out_c = out_c + "\t\tJNIEnv *env;\n"
 445                 out_c = out_c + "\t\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_8) == JNI_OK);\n"
 446                 out_c = out_c + "\t\t(*env)->DeleteWeakGlobalRef(env, j_calls->o);\n"
 447                 out_c = out_c + "\t\tFREE(j_calls);\n"
 448                 out_c = out_c + "\t}\n}\n"
 449
 450         for idx, fn_line in enumerate(field_function_lines):
 451             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 452                 assert fn_line.ret_ty_info.ty_info.get_full_rust_ty()[1] == ""
 453                 out_c = out_c + fn_line.ret_ty_info.ty_info.get_full_rust_ty()[0] + " " + fn_line.fn_name + "_jcall("
 454                 if fn_line.self_is_const:
 455                     out_c = out_c + "const void* this_arg"
 456                 else:
 457                     out_c = out_c + "void* this_arg"
 458
 459                 for idx, arg in enumerate(fn_line.args_ty):
 460                     out_c = out_c + ", " + arg.ty_info.get_full_rust_ty()[0] + " " + arg.arg_name + arg.ty_info.get_full_rust_ty()[1]
 461
 462                 out_c = out_c + ") {\n"
 463                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 464                 out_c = out_c + "\tJNIEnv *env;\n"
 465                 out_c = out_c + "\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_8) == JNI_OK);\n"
 466
 467                 for arg_info in fn_line.args_ty:
 468                     if arg_info.ret_conv is not None:
 469                         out_c = out_c + "\t" + arg_info.ret_conv[0].replace('\n', '\n\t')
 470                         out_c = out_c + arg_info.arg_name
 471                         out_c = out_c + arg_info.ret_conv[1].replace('\n', '\n\t') + "\n"
 472
 473                 out_c = out_c + "\tjobject obj = (*env)->NewLocalRef(env, j_calls->o);\n\tCHECK(obj != NULL);\n"
 474                 if fn_line.ret_ty_info.c_ty.endswith("Array"):
 475                     out_c = out_c + "\t" + fn_line.ret_ty_info.c_ty + " arg = (*env)->CallObjectMethod(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 476                 elif not fn_line.ret_ty_info.passed_as_ptr:
 477                     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"
 478                 else:
 479                     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"
 480
 481                 for idx, arg_info in enumerate(fn_line.args_ty):
 482                     if arg_info.ret_conv is not None:
 483                         out_c = out_c + ", " + arg_info.ret_conv_name
 484                     else:
 485                         out_c = out_c + ", " + arg_info.arg_name
 486                 out_c = out_c + ");\n"
 487                 if fn_line.ret_ty_info.arg_conv is not None:
 488                     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"
 489
 490                 out_c = out_c + "}\n"
 491
 492         # Write out a clone function whether we need one or not, as we use them in moving to rust
 493         out_c = out_c + "static void* " + struct_name + "_JCalls_clone(const 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 + "\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n"
 496         for var in field_var_conversions:
 497             if not isinstance(var, ConvInfo):
 498                 out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->" + var[1] + "->refcnt, 1, memory_order_release);\n"
 499         out_c = out_c + "\treturn (void*) this_arg;\n"
 500         out_c = out_c + "}\n"
 501
 502         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_init (" + self.c_fn_args_pfx + ", jobject o"
 503         for var in field_var_conversions:
 504             if isinstance(var, ConvInfo):
 505                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 506             else:
 507                 out_c = out_c + ", jobject " + var[1]
 508         out_c = out_c + ") {\n"
 509
 510         out_c = out_c + "\tjclass c = (*env)->GetObjectClass(env, o);\n"
 511         out_c = out_c + "\tCHECK(c != NULL);\n"
 512         out_c = out_c + "\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n"
 513         out_c = out_c + "\tatomic_init(&calls->refcnt, 1);\n"
 514         out_c = out_c + "\tDO_ASSERT((*env)->GetJavaVM(env, &calls->vm) == 0);\n"
 515         out_c = out_c + "\tcalls->o = (*env)->NewWeakGlobalRef(env, o);\n"
 516
 517         for (fn_name, java_meth_descr) in java_meths:
 518             if fn_name != "free" and fn_name != "clone":
 519                 out_c = out_c + "\tcalls->" + fn_name + "_meth = (*env)->GetMethodID(env, c, \"" + fn_name + "\", \"" + java_meth_descr + "\");\n"
 520                 out_c = out_c + "\tCHECK(calls->" + fn_name + "_meth != NULL);\n"
 521
 522         for var in field_var_conversions:
 523             if isinstance(var, ConvInfo) and var.arg_conv is not None:
 524                 out_c = out_c + "\n\t" + var.arg_conv.replace("\n", "\n\t") +"\n"
 525         out_c = out_c + "\n\t" + struct_name + " ret = {\n"
 526         out_c = out_c + "\t\t.this_arg = (void*) calls,\n"
 527         for fn_line in field_function_lines:
 528             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 529                 out_c = out_c + "\t\t." + fn_line.fn_name + " = " + fn_line.fn_name + "_jcall,\n"
 530             elif fn_line.fn_name == "free":
 531                 out_c = out_c + "\t\t.free = " + struct_name + "_JCalls_free,\n"
 532             else:
 533                 out_c = out_c + "\t\t.clone = " + struct_name + "_JCalls_clone,\n"
 534         for var in field_var_conversions:
 535             if isinstance(var, ConvInfo):
 536                 if var.arg_conv_name is not None:
 537                     out_c = out_c + "\t\t." + var.arg_name + " = " + var.arg_conv_name + ",\n"
 538                     out_c = out_c + "\t\t.set_" + var.arg_name + " = NULL,\n"
 539                 else:
 540                     out_c = out_c + "\t\t." + var.var_name + " = " + var.var_name + ",\n"
 541                     out_c = out_c + "\t\t.set_" + var.var_name + " = NULL,\n"
 542             else:
 543                 out_c = out_c + "\t\t." + var[1] + " = " + var[0] + "_init(env, clz, " + var[1] + "),\n"
 544         out_c = out_c + "\t};\n"
 545         for var in field_var_conversions:
 546             if not isinstance(var, ConvInfo):
 547                 out_c = out_c + "\tcalls->" + var[1] + " = ret." + var[1] + ".this_arg;\n"
 548         out_c = out_c + "\treturn ret;\n"
 549         out_c = out_c + "}\n"
 550
 551         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"
 552         for var in field_var_conversions:
 553             if isinstance(var, ConvInfo):
 554                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 555             else:
 556                 out_c = out_c + ", jobject " + var[1]
 557         out_c = out_c + ") {\n"
 558         out_c = out_c + "\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n"
 559         out_c = out_c + "\t*res_ptr = " + struct_name + "_init(env, clz, o"
 560         for var in field_var_conversions:
 561             if isinstance(var, ConvInfo):
 562                 out_c = out_c + ", " + var.arg_name
 563             else:
 564                 out_c = out_c + ", " + var[1]
 565         out_c = out_c + ");\n"
 566         out_c = out_c + "\treturn (long)res_ptr;\n"
 567         out_c = out_c + "}\n"
 568
 569         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"
 570         out_c = out_c + "\tjobject ret = (*env)->NewLocalRef(env, ((" + struct_name + "_JCalls*)val)->o);\n"
 571         out_c = out_c + "\tCHECK(ret != NULL);\n"
 572         out_c = out_c + "\treturn ret;\n"
 573         out_c = out_c + "}\n"
 574
 575
 576         return (out_java, out_java_trait, out_c)
 577
 578     def map_complex_enum(self, struct_name, variant_list, camel_to_snake):
 579         java_hu_type = struct_name.replace("LDK", "")
 580
 581         out_java_enum = ""
 582         out_java = ""
 583         out_c = ""
 584
 585         out_java_enum += (self.hu_struct_file_prefix)
 586         out_java_enum += ("export default class " + java_hu_type + " extends CommonBase {\n")
 587         out_java_enum += ("\tprotected constructor(_dummy: object, ptr: number) { super(ptr); }\n")
 588         out_java_enum += ("\tprotected finalize() {\n")
 589         out_java_enum += ("\t\tsuper.finalize();\n")
 590         out_java_enum += ("\t\tif (this.ptr != 0) { bindings." + java_hu_type + "_free(this.ptr); }\n")
 591         out_java_enum += ("\t}\n")
 592         out_java_enum += f"\tstatic constr_from_ptr(ptr: number): {java_hu_type} {{\n"
 593         out_java_enum += (f"\t\tconst raw_val: bindings.{struct_name} = bindings." + struct_name + "_ref_from_ptr(ptr);\n")
 594         java_hu_subclasses = ""
 595
 596         out_java +=  ("\tpublic static class " + struct_name + " {\n")
 597         out_java +=  ("\t\tprivate " + struct_name + "() {}\n")
 598         for var in variant_list:
 599             out_java +=  ("\t\texport class " + var.var_name + " extends " + struct_name + " {\n")
 600             java_hu_subclasses = java_hu_subclasses + "export class " + var.var_name + " extends " + java_hu_type + " {\n"
 601             out_java_enum += ("\t\tif (raw_val instanceof bindings." + struct_name + "." + var.var_name + ") {\n")
 602             out_java_enum += ("\t\t\treturn new " + var.var_name + "(this.ptr, raw_val);\n")
 603             init_meth_params = ""
 604             init_meth_body = ""
 605             hu_conv_body = ""
 606             for idx, field_ty in enumerate(var.fields):
 607                 out_java += ("\t\t\tpublic " + field_ty.java_ty + " " + field_ty.arg_name + ";\n")
 608                 java_hu_subclasses = java_hu_subclasses + "\tpublic " + field_ty.arg_name + f": {field_ty.java_hu_ty};\n"
 609                 if field_ty.to_hu_conv is not None:
 610                     hu_conv_body = hu_conv_body + "\t\tconst " + field_ty.arg_name + f": {field_ty.java_ty} = obj." + field_ty.arg_name + ";\n"
 611                     hu_conv_body = hu_conv_body + "\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
 612                     hu_conv_body = hu_conv_body + "\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
 613                 else:
 614                     hu_conv_body = hu_conv_body + "\t\tthis." + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
 615                 if idx > 0:
 616                     init_meth_params = init_meth_params + ", "
 617                 init_meth_params = init_meth_params + field_ty.java_ty + " " + field_ty.arg_name
 618                 init_meth_body = init_meth_body + "this." + field_ty.arg_name + " = " + field_ty.arg_name + "; "
 619             out_java +=  ("\t\t\t" + var.var_name + "(" + init_meth_params + ") { ")
 620             out_java +=  (init_meth_body)
 621             out_java +=  ("}\n")
 622             out_java += ("\t\t}\n")
 623             out_java_enum += ("\t\t}\n")
 624             java_hu_subclasses = java_hu_subclasses + "\tprivate constructor(ptr: number, obj: bindings." + struct_name + "." + var.var_name + ") {\n\t\tsuper(null, ptr);\n"
 625             java_hu_subclasses = java_hu_subclasses + hu_conv_body
 626             java_hu_subclasses = java_hu_subclasses + "\t}\n}\n"
 627         out_java += ("\t\tstatic native void init();\n")
 628         out_java += ("\t}\n")
 629         out_java_enum += ("\t\tthrow new Error('oops, this should be unreachable'); // Unreachable without extending the (internal) bindings interface\n\t}\n\n")
 630         out_java += ("\tstatic { " + struct_name + ".init(); }\n")
 631         out_java += ("\tpublic static native " + struct_name + " " + struct_name + "_ref_from_ptr(long ptr);\n");
 632
 633         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")
 634         out_c += ("\t" + struct_name + " *obj = (" + struct_name + "*)ptr;\n")
 635         out_c += ("\tswitch(obj->tag) {\n")
 636         for var in variant_list:
 637             out_c += ("\t\tcase " + struct_name + "_" + var.var_name + ": {\n")
 638             c_params = []
 639             for idx, field_map in enumerate(var.fields):
 640                 if field_map.ret_conv is not None:
 641                     out_c += ("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
 642                     out_c += ("obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name)
 643                     out_c += (field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
 644                     c_params.append(field_map.ret_conv_name)
 645                 else:
 646                     c_params.append("obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name)
 647             out_c += ("\t\t\treturn " + self.c_constr_native_complex_enum(struct_name, var.var_name, c_params) + ";\n")
 648             out_c += ("\t\t}\n")
 649         out_c += ("\t\tdefault: abort();\n")
 650         out_c += ("\t}\n}\n")
 651         out_java_enum += ("}\n")
 652         out_java_enum += (java_hu_subclasses)
 653         return (out_java, out_java_enum, out_c)