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