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