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

   1 #!/usr/bin/env python3
   2 import sys, re, subprocess
   3
   4 if len(sys.argv) < 7:
   5     print("USAGE: /path/to/lightning.h /path/to/bindings/output /path/to/bindings/ /path/to/bindings/output.c debug lang")
   6     sys.exit(1)
   7
   8 if sys.argv[5] == "false":
   9     DEBUG = False
  10 elif sys.argv[5] == "true":
  11     DEBUG = True
  12 else:
  13     print("debug should be true or false and indicates whether to track allocations and ensure we don't leak")
  14     sys.exit(1)
  15
  16 target = None
  17 if sys.argv[6] == "java" or sys.argv[6] == "android":
  18     import java_strings
  19     from java_strings import Consts
  20     target = java_strings.Target.JAVA
  21     if sys.argv[6] == "android":
  22         target = java_strings.Target.ANDROID
  23 elif sys.argv[6] == "typescript":
  24     import typescript_strings
  25     from typescript_strings import Consts
  26     target = typescript_strings.Target.NODEJS
  27     if len(sys.argv) == 8 and sys.argv[7] == 'browser':
  28         target = typescript_strings.Target.BROWSER
  29 else:
  30     print("Only java or typescript can be set for lang")
  31     sys.exit(1)
  32
  33
  34 consts = Consts(DEBUG, target=target)
  35
  36 local_git_version = subprocess.check_output(["git", "describe", '--tag', '--dirty']).decode("utf-8").strip()
  37
  38 from bindingstypes import *
  39
  40 c_file = ""
  41 def write_c(s):
  42     global c_file
  43     c_file += s
  44
  45 def camel_to_snake(s):
  46     # Convert camel case to snake case, in a way that appears to match cbindgen
  47     con = "_"
  48     ret = ""
  49     lastchar = ""
  50     lastund = False
  51     for char in s:
  52         if lastchar.isupper():
  53             if not char.isupper() and not lastund:
  54                 ret = ret + "_"
  55                 lastund = True
  56             else:
  57                 lastund = False
  58             ret = ret + lastchar.lower()
  59         else:
  60             ret = ret + lastchar
  61             if char.isupper() and not lastund:
  62                 ret = ret + "_"
  63                 lastund = True
  64             else:
  65                 lastund = False
  66         lastchar = char
  67         if char.isnumeric():
  68             lastund = True
  69     return (ret + lastchar.lower()).strip("_")
  70
  71 unitary_enums = set()
  72 complex_enums = set()
  73 opaque_structs = set()
  74 trait_structs = {}
  75 result_types = set()
  76 tuple_types = {}
  77
  78 var_is_arr_regex = re.compile("\(\*([A-za-z0-9_]*)\)\[([a-z0-9]*)\]")
  79 var_ty_regex = re.compile("([A-za-z_0-9]*)(.*)")
  80 java_c_types_none_allowed = True # Unset when we do the real pass that populates the above sets
  81 def java_c_types(fn_arg, ret_arr_len):
  82     fn_arg = fn_arg.strip()
  83     if fn_arg.startswith("MUST_USE_RES "):
  84         fn_arg = fn_arg[13:]
  85     is_const = False
  86     if fn_arg.startswith("const "):
  87         fn_arg = fn_arg[6:]
  88         is_const = True
  89     if fn_arg.startswith("struct "):
  90         fn_arg = fn_arg[7:]
  91     if fn_arg.startswith("enum "):
  92         fn_arg = fn_arg[5:]
  93     nonnull_ptr = "NONNULL_PTR" in fn_arg
  94     fn_arg = fn_arg.replace("NONNULL_PTR", "")
  95
  96     is_ptr = False
  97     take_by_ptr = False
  98     rust_obj = None
  99     arr_access = None
 100     java_hu_ty = None
 101     if fn_arg.startswith("LDKThirtyTwoBytes"):
 102         fn_arg = "uint8_t (*" + fn_arg[18:] + ")[32]"
 103         assert var_is_arr_regex.match(fn_arg[8:])
 104         rust_obj = "LDKThirtyTwoBytes"
 105         arr_access = "data"
 106     elif fn_arg.startswith("LDKTxid"):
 107         fn_arg = "uint8_t (*" + fn_arg[8:] + ")[32]"
 108         assert var_is_arr_regex.match(fn_arg[8:])
 109         rust_obj = "LDKThirtyTwoBytes"
 110         arr_access = "data"
 111     elif fn_arg.startswith("LDKPublicKey"):
 112         fn_arg = "uint8_t (*" + fn_arg[13:] + ")[33]"
 113         assert var_is_arr_regex.match(fn_arg[8:])
 114         rust_obj = "LDKPublicKey"
 115         arr_access = "compressed_form"
 116     elif fn_arg.startswith("LDKSecretKey"):
 117         fn_arg = "uint8_t (*" + fn_arg[13:] + ")[32]"
 118         assert var_is_arr_regex.match(fn_arg[8:])
 119         rust_obj = "LDKSecretKey"
 120         arr_access = "bytes"
 121     elif fn_arg.startswith("LDKSignature"):
 122         fn_arg = "uint8_t (*" + fn_arg[13:] + ")[64]"
 123         assert var_is_arr_regex.match(fn_arg[8:])
 124         rust_obj = "LDKSignature"
 125         arr_access = "compact_form"
 126     elif fn_arg.startswith("LDKRecoverableSignature"):
 127         fn_arg = "uint8_t (*" + fn_arg[25:] + ")[68]"
 128         assert var_is_arr_regex.match(fn_arg[8:])
 129         rust_obj = "LDKRecoverableSignature"
 130         arr_access = "serialized_form"
 131     elif fn_arg.startswith("LDKThreeBytes"):
 132         fn_arg = "uint8_t (*" + fn_arg[14:] + ")[3]"
 133         assert var_is_arr_regex.match(fn_arg[8:])
 134         rust_obj = "LDKThreeBytes"
 135         arr_access = "data"
 136     elif fn_arg.startswith("LDKFourBytes"):
 137         fn_arg = "uint8_t (*" + fn_arg[13:] + ")[4]"
 138         assert var_is_arr_regex.match(fn_arg[8:])
 139         rust_obj = "LDKFourBytes"
 140         arr_access = "data"
 141     elif fn_arg.startswith("LDKSixteenBytes"):
 142         fn_arg = "uint8_t (*" + fn_arg[16:] + ")[16]"
 143         assert var_is_arr_regex.match(fn_arg[8:])
 144         rust_obj = "LDKSixteenBytes"
 145         arr_access = "data"
 146     elif fn_arg.startswith("LDKTwentyBytes"):
 147         fn_arg = "uint8_t (*" + fn_arg[15:] + ")[20]"
 148         assert var_is_arr_regex.match(fn_arg[8:])
 149         rust_obj = "LDKTwentyBytes"
 150         arr_access = "data"
 151     elif fn_arg.startswith("LDKTenBytes"):
 152         fn_arg = "uint8_t (*" + fn_arg[12:] + ")[10]"
 153         assert var_is_arr_regex.match(fn_arg[8:])
 154         rust_obj = "LDKTenBytes"
 155         arr_access = "data"
 156     elif fn_arg.startswith("LDKu8slice"):
 157         fn_arg = "uint8_t (*" + fn_arg[11:] + ")[datalen]"
 158         assert var_is_arr_regex.match(fn_arg[8:])
 159         rust_obj = "LDKu8slice"
 160         arr_access = "data"
 161     elif fn_arg.startswith("LDKCVec_u8Z"):
 162         fn_arg = "uint8_t (*" + fn_arg[12:] + ")[datalen]"
 163         rust_obj = "LDKCVec_u8Z"
 164         assert var_is_arr_regex.match(fn_arg[8:])
 165         arr_access = "data"
 166     elif fn_arg.startswith("LDKTransaction ") or fn_arg == "LDKTransaction":
 167         fn_arg = "uint8_t (*" + fn_arg[15:] + ")[datalen]"
 168         rust_obj = "LDKTransaction"
 169         assert var_is_arr_regex.match(fn_arg[8:])
 170         arr_access = "data"
 171     elif fn_arg.startswith("LDKCVec_"):
 172         is_ptr = False
 173         if "*" in fn_arg:
 174             fn_arg = fn_arg.replace("*", "")
 175             is_ptr = True
 176
 177         tyn = fn_arg[8:].split(" ")
 178         assert tyn[0].endswith("Z")
 179         if tyn[0] == "u64Z":
 180             new_arg = "uint64_t"
 181         else:
 182             new_arg = "LDK" + tyn[0][:-1]
 183         for a in tyn[1:]:
 184             new_arg = new_arg + " " + a
 185         res = java_c_types(new_arg, ret_arr_len)
 186         if res is None:
 187             assert java_c_types_none_allowed
 188             return None
 189         if is_ptr:
 190             res.pass_by_ref = True
 191         if res.is_native_primitive or res.passed_as_ptr:
 192             return TypeInfo(rust_obj=fn_arg.split(" ")[0], java_ty=res.java_ty + "[]", java_hu_ty=res.java_hu_ty + "[]",
 193                 java_fn_ty_arg="[" + res.java_fn_ty_arg, c_ty=res.c_ty + "Array", passed_as_ptr=False, is_ptr=is_ptr,
 194                 nonnull_ptr=nonnull_ptr, is_const=is_const,
 195                 var_name=res.var_name, arr_len="datalen", arr_access="data", subty=res, is_native_primitive=False)
 196         else:
 197             return TypeInfo(rust_obj=fn_arg.split(" ")[0], java_ty=res.java_ty + "[]", java_hu_ty=res.java_hu_ty + "[]",
 198                 java_fn_ty_arg="[" + res.java_fn_ty_arg, c_ty=consts.ptr_arr, passed_as_ptr=False, is_ptr=is_ptr,
 199                 nonnull_ptr=nonnull_ptr, is_const=is_const,
 200                 var_name=res.var_name, arr_len="datalen", arr_access="data", subty=res, is_native_primitive=False)
 201
 202     is_primitive = False
 203     arr_len = None
 204     mapped_type = []
 205     java_type_plural = None
 206     if fn_arg.startswith("void"):
 207         java_ty = "void"
 208         c_ty = "void"
 209         fn_ty_arg = "V"
 210         fn_arg = fn_arg[4:].strip()
 211         is_primitive = True
 212     elif fn_arg.startswith("bool"):
 213         java_ty = "boolean"
 214         c_ty = "jboolean"
 215         fn_ty_arg = "Z"
 216         fn_arg = fn_arg[4:].strip()
 217         is_primitive = True
 218     elif fn_arg.startswith("uint8_t"):
 219         mapped_type = consts.c_type_map['uint8_t']
 220         java_ty = mapped_type[0]
 221         c_ty = "int8_t"
 222         fn_ty_arg = "B"
 223         fn_arg = fn_arg[7:].strip()
 224         is_primitive = True
 225     elif fn_arg.startswith("LDKu5"):
 226         java_ty = consts.c_type_map['uint8_t'][0]
 227         java_hu_ty = "UInt5"
 228         rust_obj = "LDKu5"
 229         c_ty = "int8_t"
 230         fn_ty_arg = "B"
 231         fn_arg = fn_arg[6:].strip()
 232     elif fn_arg.startswith("uint16_t"):
 233         mapped_type = consts.c_type_map['uint16_t']
 234         java_ty = mapped_type[0]
 235         c_ty = "int16_t"
 236         fn_ty_arg = "S"
 237         fn_arg = fn_arg[8:].strip()
 238         is_primitive = True
 239     elif fn_arg.startswith("uint32_t"):
 240         mapped_type = consts.c_type_map['uint32_t']
 241         java_ty = mapped_type[0]
 242         c_ty = "int32_t"
 243         fn_ty_arg = "I"
 244         fn_arg = fn_arg[8:].strip()
 245         is_primitive = True
 246     elif fn_arg.startswith("uint64_t") or fn_arg.startswith("uintptr_t"):
 247         # TODO: uintptr_t is arch-dependent :(
 248         mapped_type = consts.c_type_map['uint64_t']
 249         java_ty = mapped_type[0]
 250         fn_ty_arg = "J"
 251         if fn_arg.startswith("uint64_t"):
 252             c_ty = "int64_t"
 253             fn_arg = fn_arg[8:].strip()
 254         else:
 255             c_ty = "int64_t"
 256             rust_obj = "uintptr_t"
 257             fn_arg = fn_arg[9:].strip()
 258         is_primitive = True
 259     elif is_const and fn_arg.startswith("char *"):
 260         java_ty = "String"
 261         c_ty = "const char*"
 262         fn_ty_arg = "Ljava/lang/String;"
 263         fn_arg = fn_arg[6:].strip()
 264     elif fn_arg.startswith("LDKStr"):
 265         rust_obj = "LDKStr"
 266         java_ty = "String"
 267         c_ty = "jstring"
 268         fn_ty_arg = "Ljava/lang/String;"
 269         fn_arg = fn_arg[6:].strip()
 270         arr_access = "chars"
 271         arr_len = "len"
 272     else:
 273         ma = var_ty_regex.match(fn_arg)
 274         if ma.group(1).strip() in unitary_enums:
 275             java_ty = ma.group(1).strip()
 276             c_ty = consts.result_c_ty
 277             fn_ty_arg = "Lorg/ldk/enums/" + ma.group(1).strip() + ";"
 278             fn_arg = ma.group(2).strip()
 279             rust_obj = ma.group(1).strip()
 280         elif ma.group(1).strip().startswith("LDKC2Tuple"):
 281             c_ty = consts.ptr_c_ty
 282             java_ty = consts.ptr_native_ty
 283             java_hu_ty = "TwoTuple<"
 284             if not ma.group(1).strip() in tuple_types:
 285                 assert java_c_types_none_allowed
 286                 return None
 287             for idx, ty_info in enumerate(tuple_types[ma.group(1).strip()][0]):
 288                 if idx != 0:
 289                     java_hu_ty = java_hu_ty + ", "
 290                 if ty_info.is_native_primitive:
 291                     if ty_info.java_hu_ty == "int":
 292                         java_hu_ty = java_hu_ty + "Integer" # Java concrete integer type is Integer, not Int
 293                     else:
 294                         java_hu_ty = java_hu_ty + ty_info.java_hu_ty.title() # If we're a primitive, capitalize the first letter
 295                 else:
 296                     java_hu_ty = java_hu_ty + ty_info.java_hu_ty
 297             java_hu_ty = java_hu_ty + ">"
 298             fn_ty_arg = "J"
 299             fn_arg = ma.group(2).strip()
 300             rust_obj = ma.group(1).strip()
 301             take_by_ptr = True
 302         elif ma.group(1).strip().startswith("LDKC3Tuple"):
 303             c_ty = consts.ptr_c_ty
 304             java_ty = consts.ptr_native_ty
 305             java_hu_ty = "ThreeTuple<"
 306             if not ma.group(1).strip() in tuple_types:
 307                 assert java_c_types_none_allowed
 308                 return None
 309             for idx, ty_info in enumerate(tuple_types[ma.group(1).strip()][0]):
 310                 if idx != 0:
 311                     java_hu_ty = java_hu_ty + ", "
 312                 if ty_info.is_native_primitive:
 313                     if ty_info.java_hu_ty == "int":
 314                         java_hu_ty = java_hu_ty + "Integer" # Java concrete integer type is Integer, not Int
 315                     else:
 316                         java_hu_ty = java_hu_ty + ty_info.java_hu_ty.title() # If we're a primitive, capitalize the first letter
 317                 else:
 318                     java_hu_ty = java_hu_ty + ty_info.java_hu_ty
 319             java_hu_ty = java_hu_ty + ">"
 320             fn_ty_arg = "J"
 321             fn_arg = ma.group(2).strip()
 322             rust_obj = ma.group(1).strip()
 323             take_by_ptr = True
 324         else:
 325             c_ty = consts.ptr_c_ty
 326             java_ty = consts.ptr_native_ty
 327             java_hu_ty = ma.group(1).strip().replace("LDKCOption", "Option").replace("LDKCResult", "Result").replace("LDK", "")
 328             fn_ty_arg = "J"
 329             fn_arg = ma.group(2).strip()
 330             rust_obj = ma.group(1).strip()
 331             take_by_ptr = True
 332
 333     if fn_arg.startswith(" *") or fn_arg.startswith("*"):
 334         fn_arg = fn_arg.replace("*", "").strip()
 335         is_ptr = True
 336         c_ty = consts.ptr_c_ty
 337         java_ty = consts.ptr_native_ty
 338         fn_ty_arg = "J"
 339
 340     var_is_arr = var_is_arr_regex.match(fn_arg)
 341     if var_is_arr is not None or ret_arr_len is not None:
 342         assert(not take_by_ptr)
 343         assert(not is_ptr)
 344         # is there a special case for plurals?
 345         if len(mapped_type) == 2:
 346             java_ty = mapped_type[1]
 347         else:
 348             java_ty = java_ty + "[]"
 349         c_ty = c_ty + "Array"
 350         if var_is_arr is not None:
 351             if var_is_arr.group(1) == "":
 352                 return TypeInfo(rust_obj=rust_obj, java_ty=java_ty, java_hu_ty=java_ty, java_fn_ty_arg="[" + fn_ty_arg, c_ty=c_ty, is_const=is_const,
 353                     passed_as_ptr=False, is_ptr=False, nonnull_ptr=nonnull_ptr, var_name="arg",
 354                     arr_len=var_is_arr.group(2), arr_access=arr_access, is_native_primitive=False)
 355             return TypeInfo(rust_obj=rust_obj, java_ty=java_ty, java_hu_ty=java_ty, java_fn_ty_arg="[" + fn_ty_arg, c_ty=c_ty, is_const=is_const,
 356                 passed_as_ptr=False, is_ptr=False, nonnull_ptr=nonnull_ptr, var_name=var_is_arr.group(1),
 357                 arr_len=var_is_arr.group(2), arr_access=arr_access, is_native_primitive=False)
 358
 359     if java_hu_ty is None:
 360         java_hu_ty = java_ty
 361     return TypeInfo(rust_obj=rust_obj, java_ty=java_ty, java_hu_ty=java_hu_ty, java_fn_ty_arg=fn_ty_arg, c_ty=c_ty, passed_as_ptr=is_ptr or take_by_ptr,
 362         is_const=is_const, is_ptr=is_ptr, nonnull_ptr=nonnull_ptr, var_name=fn_arg, arr_len=arr_len, arr_access=arr_access, is_native_primitive=is_primitive)
 363
 364 fn_ptr_regex = re.compile("^extern const ([A-Za-z_0-9\* ]*) \(\*(.*)\)\((.*)\);$")
 365 fn_ret_arr_regex = re.compile("(.*) \(\*(.*)\((.*)\)\)\[([0-9]*)\];$")
 366 reg_fn_regex = re.compile("([A-Za-z_0-9\* ]* \*?)([a-zA-Z_0-9]*)\((.*)\);$")
 367 clone_fns = set()
 368 constructor_fns = {}
 369
 370 from gen_type_mapping import TypeMappingGenerator
 371 type_mapping_generator = TypeMappingGenerator(java_c_types, consts, opaque_structs, clone_fns, unitary_enums, trait_structs, complex_enums, result_types, tuple_types)
 372
 373 with open(sys.argv[1]) as in_h:
 374     for line in in_h:
 375         reg_fn = reg_fn_regex.match(line)
 376         if reg_fn is not None:
 377             if reg_fn.group(2).endswith("_clone"):
 378                 clone_fns.add(reg_fn.group(2))
 379             else:
 380                 rty = java_c_types(reg_fn.group(1), None)
 381                 if rty is not None and not rty.is_native_primitive and reg_fn.group(2) == rty.java_hu_ty + "_new":
 382                     constructor_fns[rty.rust_obj] = reg_fn.group(3)
 383             continue
 384         arr_fn = fn_ret_arr_regex.match(line)
 385         if arr_fn is not None:
 386             if arr_fn.group(2).endswith("_clone"):
 387                 clone_fns.add(arr_fn.group(2))
 388             # No object constructors return arrays, as then they wouldn't be an object constructor
 389             continue
 390
 391 # Define some manual clones...
 392 clone_fns.add("ThirtyTwoBytes_clone")
 393 write_c("static inline struct LDKThirtyTwoBytes ThirtyTwoBytes_clone(const struct LDKThirtyTwoBytes *orig) { struct LDKThirtyTwoBytes ret; memcpy(ret.data, orig->data, 32); return ret; }\n")
 394
 395 java_c_types_none_allowed = False # C structs created by cbindgen are declared in dependency order
 396
 397 with open(f"{sys.argv[3]}/structs/UtilMethods{consts.file_ext}", "a") as util:
 398     util.write(consts.util_fn_pfx)
 399
 400 with open(sys.argv[1]) as in_h, open(sys.argv[2], "w") as out_java:
 401     # Map a top-level function
 402     def map_fn(line, re_match, ret_arr_len, c_call_string, doc_comment):
 403         method_return_type = re_match.group(1)
 404         method_name = re_match.group(2)
 405         method_comma_separated_arguments = re_match.group(3)
 406         method_arguments = method_comma_separated_arguments.split(',')
 407
 408         is_free = method_name.endswith("_free")
 409         if method_name.startswith("COption") or method_name.startswith("CResult"):
 410             struct_meth = method_name.rsplit("Z", 1)[0][1:] + "Z"
 411         else:
 412             struct_meth = method_name.split("_")[0]
 413
 414         return_type_info = type_mapping_generator.map_type(method_return_type.strip() + " ret", True, ret_arr_len, False, False)
 415
 416         argument_types = []
 417         default_constructor_args = {}
 418         takes_self = False
 419         args_known = True
 420
 421         for argument_index, argument in enumerate(method_arguments):
 422             argument_conversion_info = type_mapping_generator.map_type(argument, False, None, is_free, True)
 423             if argument_index == 0 and argument_conversion_info.java_hu_ty == struct_meth:
 424                 takes_self = True
 425             if argument_conversion_info.arg_conv is not None and "Warning" in argument_conversion_info.arg_conv:
 426                 if argument_conversion_info.rust_obj in constructor_fns:
 427                     assert not is_free
 428                     for explode_arg in constructor_fns[argument_conversion_info.rust_obj].split(','):
 429                         explode_arg_conv = type_mapping_generator.map_type(explode_arg, False, None, False, True)
 430                         if explode_arg_conv.c_ty == "void":
 431                             # We actually want to handle this case, but for now its only used in NetGraphMsgHandler::new()
 432                             # which ends up resulting in a redundant constructor - both without arguments for the NetworkGraph.
 433                             args_known = False
 434                             pass
 435                         if not argument_conversion_info.arg_name in default_constructor_args:
 436                             default_constructor_args[argument_conversion_info.arg_name] = []
 437                         default_constructor_args[argument_conversion_info.arg_name].append(explode_arg_conv)
 438             argument_types.append(argument_conversion_info)
 439
 440         out_java.write("\t// " + line)
 441         (out_java_delta, out_c_delta, out_java_struct_delta) = \
 442             consts.map_function(argument_types, c_call_string, method_name, return_type_info, struct_meth, default_constructor_args, takes_self, args_known, type_mapping_generator, doc_comment)
 443         out_java.write(out_java_delta)
 444
 445         if is_free:
 446             assert len(argument_types) == 1
 447             assert return_type_info.c_ty == "void"
 448             write_c(consts.c_fn_ty_pfx + "void " + consts.c_fn_name_define_pfx(method_name, True) + argument_types[0].c_ty + " " + argument_types[0].ty_info.var_name + ") {\n")
 449             if argument_types[0].ty_info.passed_as_ptr and not argument_types[0].ty_info.rust_obj in opaque_structs:
 450                 write_c("\tif ((" + argument_types[0].ty_info.var_name + " & 1) != 0) return;\n")
 451
 452             for info in argument_types:
 453                 if info.arg_conv is not None:
 454                     write_c("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
 455             assert c_call_string is None
 456             write_c("\t" + method_name + "(")
 457             if argument_types[0].arg_conv_name is not None:
 458                 write_c(argument_types[0].arg_conv_name)
 459             write_c(");")
 460             for info in argument_types:
 461                 if info.arg_conv_cleanup is not None:
 462                     write_c("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
 463             write_c("\n}\n\n")
 464         else:
 465             write_c(out_c_delta)
 466
 467         out_java_struct = None
 468         expected_struct = "LDK" + struct_meth
 469         expected_cstruct = "LDKC" + struct_meth
 470         if (expected_struct in opaque_structs or expected_struct in trait_structs
 471                 or expected_struct in complex_enums or expected_cstruct in complex_enums
 472                 or expected_cstruct in result_types) and not is_free:
 473             out_java_struct = open(f"{sys.argv[3]}/structs/{struct_meth}{consts.file_ext}", "a")
 474         elif (method_name.startswith("C2Tuple_") and method_name.endswith("_read")) or \
 475                 (return_type_info.rust_obj is not None and "Result" in return_type_info.rust_obj and "from" in method_name):
 476             out_java_struct = open(f"{sys.argv[3]}/structs/UtilMethods{consts.file_ext}", "a")
 477         if out_java_struct is not None:
 478             out_java_struct.write(out_java_struct_delta)
 479
 480     def map_unitary_enum(struct_name, field_lines, enum_doc_comment):
 481         with open(f"{sys.argv[3]}/enums/{struct_name}{consts.file_ext}", "w") as out_java_enum:
 482             unitary_enums.add(struct_name)
 483             for idx, struct_line in enumerate(field_lines):
 484                 if idx == 0:
 485                     assert(struct_line == "typedef enum %s {" % struct_name)
 486                 elif idx == len(field_lines) - 3:
 487                     assert(struct_line.endswith("_Sentinel,"))
 488                 elif idx == len(field_lines) - 2:
 489                     assert(struct_line == "} %s;" % struct_name)
 490                 elif idx == len(field_lines) - 1:
 491                     assert(struct_line == "")
 492             (c_out, native_file_out, native_out) = consts.native_c_unitary_enum_map(struct_name, [x.strip().strip(",") for x in field_lines[1:-3]], enum_doc_comment)
 493             write_c(c_out)
 494             out_java_enum.write(native_file_out)
 495             out_java.write(native_out)
 496
 497     def map_complex_enum(struct_name, union_enum_items, inline_enum_variants, enum_doc_comment):
 498         java_hu_type = struct_name.replace("LDK", "").replace("COption", "Option")
 499         complex_enums.add(struct_name)
 500
 501         enum_variants = []
 502         tag_field_lines = union_enum_items["field_lines"]
 503         for idx, struct_line in enumerate(tag_field_lines):
 504             if idx == 0:
 505                 assert(struct_line == "typedef enum %s_Tag {" % struct_name)
 506             elif idx == len(tag_field_lines) - 3:
 507                 assert(struct_line.endswith("_Sentinel,"))
 508             elif idx == len(tag_field_lines) - 2:
 509                 assert(struct_line == "} %s_Tag;" % struct_name)
 510             elif idx == len(tag_field_lines) - 1:
 511                 assert(struct_line == "")
 512             else:
 513                 variant_name = struct_line.strip(' ,')[len(struct_name) + 1:]
 514                 fields = []
 515                 if "LDK" + variant_name in union_enum_items:
 516                     enum_var_lines = union_enum_items["LDK" + variant_name]
 517                     for idx, field in enumerate(enum_var_lines):
 518                         if idx != 0 and idx < len(enum_var_lines) - 2 and field.strip() != "":
 519                             fields.append(type_mapping_generator.map_type(field.strip(' ;'), False, None, False, True))
 520                     enum_variants.append(ComplexEnumVariantInfo(variant_name, fields, False))
 521                 elif camel_to_snake(variant_name) in inline_enum_variants:
 522                     fields.append(type_mapping_generator.map_type(inline_enum_variants[camel_to_snake(variant_name)] + " " + camel_to_snake(variant_name), False, None, False, True))
 523                     enum_variants.append(ComplexEnumVariantInfo(variant_name, fields, True))
 524                 else:
 525                     enum_variants.append(ComplexEnumVariantInfo(variant_name, fields, True))
 526
 527         with open(f"{sys.argv[3]}/structs/{java_hu_type}{consts.file_ext}", "w") as out_java_enum:
 528             (out_java_addendum, out_java_enum_addendum, out_c_addendum) = consts.map_complex_enum(struct_name, enum_variants, camel_to_snake, enum_doc_comment)
 529
 530             out_java_enum.write(out_java_enum_addendum)
 531             out_java.write(out_java_addendum)
 532             write_c(out_c_addendum)
 533
 534     def map_trait(struct_name, field_var_lines, trait_fn_lines, trait_doc_comment):
 535         with open(f"{sys.argv[3]}/structs/{struct_name.replace('LDK', '')}{consts.file_ext}", "w") as out_java_trait:
 536             field_var_convs = []
 537             flattened_field_var_convs = []
 538             for var_line in field_var_lines:
 539                 if var_line.group(1) in trait_structs:
 540                     field_var_convs.append((var_line.group(1), var_line.group(2), trait_structs[var_line.group(1)]))
 541                     flattened_field_var_convs.append((var_line.group(1), var_line.group(2), ))
 542                     flattened_field_var_convs.extend(trait_structs[var_line.group(1)])
 543                 else:
 544                     mapped = type_mapping_generator.map_type(var_line.group(1) + " " + var_line.group(2), False, None, False, False)
 545                     field_var_convs.append(mapped)
 546                     flattened_field_var_convs.append(mapped)
 547             trait_structs[struct_name] = field_var_convs
 548
 549             field_fns = []
 550             for fn_docs, fn_line in trait_fn_lines:
 551                 ret_ty_info = type_mapping_generator.map_type(fn_line.group(2).strip() + " ret", True, None, False, False)
 552                 is_const = fn_line.group(4) is not None
 553
 554                 arg_tys = []
 555                 for idx, arg in enumerate(fn_line.group(5).split(',')):
 556                     if arg == "":
 557                         continue
 558                     arg_conv_info = type_mapping_generator.map_type(arg, True, None, False, False)
 559                     arg_tys.append(arg_conv_info)
 560                 field_fns.append(TraitMethInfo(fn_line.group(3), is_const, ret_ty_info, arg_tys, fn_docs))
 561
 562             (out_java_addendum, out_java_trait_addendum, out_c_addendum) = consts.native_c_map_trait(struct_name, field_var_convs, flattened_field_var_convs, field_fns, trait_doc_comment)
 563             write_c(out_c_addendum)
 564             out_java_trait.write(out_java_trait_addendum)
 565             out_java.write(out_java_addendum)
 566
 567         for fn_docs, fn_line in trait_fn_lines:
 568             # For now, just disable enabling the _call_log - we don't know how to inverse-map String
 569             is_log = fn_line.group(3) == "log" and struct_name == "LDKLogger"
 570             if fn_line.group(3) != "free" and fn_line.group(3) != "clone" and fn_line.group(3) != "eq" and not is_log:
 571                 dummy_line = fn_line.group(2) + struct_name.replace("LDK", "") + "_" + fn_line.group(3) + " " + struct_name + " *NONNULL_PTR this_arg" + fn_line.group(5) + "\n"
 572                 map_fn(dummy_line, re.compile("([A-Za-z_0-9]*) *([A-Za-z_0-9]*) *(.*)").match(dummy_line), None, "(this_arg_conv->" + fn_line.group(3) + ")(this_arg_conv->this_arg", fn_docs)
 573         for idx, var_line in enumerate(field_var_lines):
 574             if var_line.group(1) not in trait_structs:
 575                 write_c(var_line.group(1) + " " + struct_name + "_set_get_" + var_line.group(2) + "(" + struct_name + "* this_arg) {\n")
 576                 write_c("\tif (this_arg->set_" + var_line.group(2) + " != NULL)\n")
 577                 write_c("\t\tthis_arg->set_" + var_line.group(2) + "(this_arg);\n")
 578                 write_c("\treturn this_arg->" + var_line.group(2) + ";\n")
 579                 write_c("}\n")
 580                 dummy_line = var_line.group(1) + " " + struct_name.replace("LDK", "") + "_get_" + var_line.group(2) + " " + struct_name + " *NONNULL_PTR this_arg" + fn_line.group(5) + "\n"
 581                 map_fn(dummy_line, re.compile("([A-Za-z_0-9]*) *([A-Za-z_0-9]*) *(.*)").match(dummy_line), None, struct_name + "_set_get_" + var_line.group(2) + "(this_arg_conv", fn_docs)
 582
 583     def map_result(struct_name, res_ty, err_ty):
 584         result_types.add(struct_name)
 585         human_ty = struct_name.replace("LDKCResult", "Result")
 586         with open(f"{sys.argv[3]}/structs/{human_ty}{consts.file_ext}", "w") as out_java_struct:
 587             out_java_struct.write(consts.hu_struct_file_prefix)
 588             out_java_struct.write("public class " + human_ty + " extends CommonBase {\n")
 589             out_java_struct.write("\tprivate " + human_ty + "(Object _dummy, long ptr) { super(ptr); }\n")
 590             out_java_struct.write("\tprotected void finalize() throws Throwable {\n")
 591             out_java_struct.write("\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); } super.finalize();\n")
 592             out_java_struct.write("\t}\n\n")
 593             out_java_struct.write("\tstatic " + human_ty + " constr_from_ptr(long ptr) {\n")
 594             out_java_struct.write("\t\tif (bindings." + struct_name + "_result_ok(ptr)) {\n")
 595             out_java_struct.write("\t\t\treturn new " + human_ty + "_OK(null, ptr);\n")
 596             out_java_struct.write("\t\t} else {\n")
 597             out_java_struct.write("\t\t\treturn new " + human_ty + "_Err(null, ptr);\n")
 598             out_java_struct.write("\t\t}\n")
 599             out_java_struct.write("\t}\n")
 600
 601             res_map = type_mapping_generator.map_type(res_ty + " res", True, None, False, True)
 602             err_map = type_mapping_generator.map_type(err_ty + " err", True, None, False, True)
 603             can_clone = True
 604             if not res_map.is_native_primitive and (res_map.rust_obj.replace("LDK", "") + "_clone" not in clone_fns):
 605                 can_clone = False
 606             if not err_map.is_native_primitive and (err_map.rust_obj.replace("LDK", "") + "_clone" not in clone_fns):
 607                 can_clone = False
 608
 609             out_java.write("\tpublic static native boolean " + struct_name + "_result_ok(long arg);\n")
 610             write_c(consts.c_fn_ty_pfx + "jboolean " + consts.c_fn_name_define_pfx(struct_name + "_result_ok", True) + consts.ptr_c_ty + " arg) {\n")
 611             write_c("\treturn ((" + struct_name + "*)arg)->result_ok;\n")
 612             write_c("}\n")
 613
 614             out_java.write("\tpublic static native " + res_map.java_ty + " " + struct_name + "_get_ok(long arg);\n")
 615             write_c(consts.c_fn_ty_pfx + res_map.c_ty + " " + consts.c_fn_name_define_pfx(struct_name + "_get_ok", True) + consts.ptr_c_ty + " arg) {\n")
 616             write_c("\t" + struct_name + " *val = (" + struct_name + "*)(arg & ~1);\n")
 617             write_c("\tCHECK(val->result_ok);\n\t")
 618             out_java_struct.write("\tpublic static final class " + human_ty + "_OK extends " + human_ty + " {\n")
 619             if res_map.ret_conv is not None:
 620                 write_c(res_map.ret_conv[0].replace("\n", "\n\t") + "(*val->contents.result)")
 621                 write_c(res_map.ret_conv[1].replace("\n", "\n\t") + "\n\treturn " + res_map.ret_conv_name)
 622             else:
 623                 write_c("return *val->contents.result")
 624             write_c(";\n}\n")
 625
 626             if res_map.java_hu_ty != "void":
 627                 out_java_struct.write("\t\tpublic final " + res_map.java_hu_ty + " res;\n")
 628             out_java_struct.write("\t\tprivate " + human_ty + "_OK(Object _dummy, long ptr) {\n")
 629             out_java_struct.write("\t\t\tsuper(_dummy, ptr);\n")
 630             if res_map.java_hu_ty == "void":
 631                 pass
 632             elif res_map.to_hu_conv is not None:
 633                 out_java_struct.write("\t\t\t" + res_map.java_ty + " res = bindings." + struct_name + "_get_ok(ptr);\n")
 634                 out_java_struct.write("\t\t\t" + res_map.to_hu_conv.replace("\n", "\n\t\t\t"))
 635                 out_java_struct.write("\n\t\t\tthis.res = " + res_map.to_hu_conv_name + ";\n")
 636             else:
 637                 out_java_struct.write("\t\t\tthis.res = bindings." + struct_name + "_get_ok(ptr);\n")
 638             out_java_struct.write("\t\t}\n")
 639             out_java_struct.write("\t}\n\n")
 640
 641             out_java.write("\tpublic static native " + err_map.java_ty + " " + struct_name + "_get_err(long arg);\n")
 642             write_c(consts.c_fn_ty_pfx + err_map.c_ty + " " + consts.c_fn_name_define_pfx(struct_name + "_get_err", True) + consts.ptr_c_ty + " arg) {\n")
 643             write_c("\t" + struct_name + " *val = (" + struct_name + "*)(arg & ~1);\n")
 644             write_c("\tCHECK(!val->result_ok);\n\t")
 645             out_java_struct.write("\tpublic static final class " + human_ty + "_Err extends " + human_ty + " {\n")
 646             if err_map.ret_conv is not None:
 647                 write_c(err_map.ret_conv[0].replace("\n", "\n\t") + "(*val->contents.err)")
 648                 write_c(err_map.ret_conv[1].replace("\n", "\n\t") + "\n\treturn " + err_map.ret_conv_name)
 649             else:
 650                 write_c("return *val->contents.err")
 651             write_c(";\n}\n")
 652
 653             if err_map.java_hu_ty != "void":
 654                 out_java_struct.write("\t\tpublic final " + err_map.java_hu_ty + " err;\n")
 655             out_java_struct.write("\t\tprivate " + human_ty + "_Err(Object _dummy, long ptr) {\n")
 656             out_java_struct.write("\t\t\tsuper(_dummy, ptr);\n")
 657             if err_map.java_hu_ty == "void":
 658                 pass
 659             elif err_map.to_hu_conv is not None:
 660                 out_java_struct.write("\t\t\t" + err_map.java_ty + " err = bindings." + struct_name + "_get_err(ptr);\n")
 661                 out_java_struct.write("\t\t\t" + err_map.to_hu_conv.replace("\n", "\n\t\t\t"))
 662                 out_java_struct.write("\n\t\t\tthis.err = " + err_map.to_hu_conv_name + ";\n")
 663             else:
 664                 out_java_struct.write("\t\t\tthis.err = bindings." + struct_name + "_get_err(ptr);\n")
 665             out_java_struct.write("\t\t}\n")
 666
 667             out_java_struct.write("\t}\n\n")
 668
 669     def map_tuple(struct_name, field_lines):
 670         out_java.write("\tpublic static native long " + struct_name + "_new(")
 671         write_c(consts.c_fn_ty_pfx + consts.ptr_c_ty + " " + consts.c_fn_name_define_pfx(struct_name + "_new", len(field_lines) > 3))
 672         ty_list = []
 673         for idx, line in enumerate(field_lines):
 674             if idx != 0 and idx < len(field_lines) - 2:
 675                 ty_info = java_c_types(line.strip(';'), None)
 676                 if idx != 1:
 677                     out_java.write(", ")
 678                     write_c(", ")
 679                 e = chr(ord('a') + idx - 1)
 680                 out_java.write(ty_info.java_ty + " " + e)
 681                 write_c(ty_info.c_ty + " " + e)
 682                 ty_list.append(ty_info)
 683         tuple_types[struct_name] = (ty_list, struct_name)
 684         out_java.write(");\n")
 685         write_c(") {\n")
 686         write_c("\t" + struct_name + "* ret = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n")
 687         for idx, line in enumerate(field_lines):
 688             if idx != 0 and idx < len(field_lines) - 2:
 689                 ty_info = type_mapping_generator.map_type(line.strip(';'), False, None, False, False)
 690                 e = chr(ord('a') + idx - 1)
 691                 if ty_info.arg_conv is not None:
 692                     write_c("\t" + ty_info.arg_conv.replace("\n", "\n\t"))
 693                     write_c("\n\tret->" + e + " = " + ty_info.arg_conv_name + ";\n")
 694                 else:
 695                     write_c("\tret->" + e + " = " + e + ";\n")
 696                 if ty_info.arg_conv_cleanup is not None:
 697                     write_c("\t//TODO: Really need to call " + ty_info.arg_conv_cleanup + " here\n")
 698         write_c("\treturn (uint64_t)ret;\n")
 699         write_c("}\n")
 700
 701         for idx, ty_info in enumerate(ty_list):
 702             e = chr(ord('a') + idx)
 703             out_java.write("\tpublic static native " + ty_info.java_ty + " " + struct_name + "_get_" + e + "(long ptr);\n")
 704             write_c(consts.c_fn_ty_pfx + ty_info.c_ty + " " + consts.c_fn_name_define_pfx(struct_name + "_get_" + e, True) + consts.ptr_c_ty + " ptr) {\n")
 705             write_c("\t" + struct_name + " *tuple = (" + struct_name + "*)(ptr & ~1);\n")
 706             conv_info = type_mapping_generator.map_type_with_info(ty_info, False, None, False, True)
 707             if conv_info.ret_conv is not None:
 708                 write_c("\t" + conv_info.ret_conv[0].replace("\n", "\n\t") + "tuple->" + e + conv_info.ret_conv[1].replace("\n", "\n\t") + "\n")
 709                 write_c("\treturn " + conv_info.ret_conv_name + ";\n")
 710             else:
 711                 write_c("\treturn tuple->" + e + ";\n")
 712             write_c("}\n")
 713
 714     out_java.write(consts.bindings_header.replace('<git_version_ldk_garbagecollected>', local_git_version))
 715
 716     with open(f"{sys.argv[3]}/structs/CommonBase{consts.file_ext}", "w") as out_java_struct:
 717         out_java_struct.write(consts.common_base)
 718
 719     block_comment = None
 720     last_block_comment = None
 721     cur_block_obj = None
 722
 723     const_val_regex = re.compile("^extern const ([A-Za-z_0-9]*) ([A-Za-z_0-9]*);$")
 724
 725     line_indicates_result_regex = re.compile("^   union (LDKCResult_[A-Za-z_0-9]*Ptr) contents;$")
 726     line_indicates_vec_regex = re.compile("^   (struct |enum |union )?([A-Za-z_0-9]*) \*data;$")
 727     line_indicates_opaque_regex = re.compile("^   bool is_owned;$")
 728     line_indicates_trait_regex = re.compile("^   (struct |enum |union )?([A-Za-z_0-9]* \*?)\(\*([A-Za-z_0-9]*)\)\((const )?void \*this_arg(.*)\);$")
 729     assert(line_indicates_trait_regex.match("   uintptr_t (*send_data)(void *this_arg, LDKu8slice data, bool resume_read);"))
 730     assert(line_indicates_trait_regex.match("   struct LDKCVec_MessageSendEventZ (*get_and_clear_pending_msg_events)(const void *this_arg);"))
 731     assert(line_indicates_trait_regex.match("   void *(*clone)(const void *this_arg);"))
 732     assert(line_indicates_trait_regex.match("   struct LDKCVec_u8Z (*write)(const void *this_arg);"))
 733     line_field_var_regex = re.compile("^   struct ([A-Za-z_0-9]*) ([A-Za-z_0-9]*);$")
 734     assert(line_field_var_regex.match("   struct LDKMessageSendEventsProvider MessageSendEventsProvider;"))
 735     assert(line_field_var_regex.match("   struct LDKChannelPublicKeys pubkeys;"))
 736     struct_name_regex = re.compile("^typedef (struct|enum|union) (MUST_USE_STRUCT )?(LDK[A-Za-z_0-9]*) {$")
 737     assert(struct_name_regex.match("typedef struct LDKCVec_u8Z {"))
 738     assert(struct_name_regex.match("typedef enum LDKNetwork {"))
 739
 740     union_enum_items = {}
 741     result_ptr_struct_items = {}
 742     for line in in_h:
 743         if block_comment is not None:
 744             if line.endswith("*/\n"):
 745                 last_block_comment = block_comment.strip("\n")
 746                 block_comment = None
 747             else:
 748                 block_comment = block_comment + line.strip(" /*")
 749         elif cur_block_obj is not None:
 750             cur_block_obj  = cur_block_obj + line
 751             if line.startswith("} "):
 752                 field_lines = []
 753                 struct_name = None
 754                 vec_ty = None
 755                 obj_lines = cur_block_obj.split("\n")
 756                 is_opaque = False
 757                 result_contents = None
 758                 is_unitary_enum = False
 759                 is_union_enum = False
 760                 is_union = False
 761                 is_tuple = False
 762                 trait_fn_lines = []
 763                 field_var_lines = []
 764
 765                 for idx, struct_line in enumerate(obj_lines):
 766                     if struct_line.strip().startswith("/*"):
 767                         block_comment = struct_line.strip(" /*")
 768                     if block_comment is not None:
 769                         if struct_line.endswith("*/"):
 770                             last_struct_block_comment = block_comment.strip("\n")
 771                             block_comment = None
 772                         else:
 773                             block_comment = block_comment + "\n" + struct_line.strip(" /*")
 774                     else:
 775                         struct_name_match = struct_name_regex.match(struct_line)
 776                         if struct_name_match is not None:
 777                             struct_name = struct_name_match.group(3)
 778                             if struct_name_match.group(1) == "enum":
 779                                 if not struct_name.endswith("_Tag"):
 780                                     is_unitary_enum = True
 781                                 else:
 782                                     is_union_enum = True
 783                             elif struct_name_match.group(1) == "union":
 784                                 is_union = True
 785                         if line_indicates_opaque_regex.match(struct_line):
 786                             is_opaque = True
 787                         result_match = line_indicates_result_regex.match(struct_line)
 788                         if result_match is not None:
 789                             result_contents = result_match.group(1)
 790                         vec_ty_match = line_indicates_vec_regex.match(struct_line)
 791                         if vec_ty_match is not None and struct_name.startswith("LDKCVec_"):
 792                             vec_ty = vec_ty_match.group(2)
 793                         elif struct_name.startswith("LDKC2Tuple_") or struct_name.startswith("LDKC3Tuple_"):
 794                             is_tuple = True
 795                         trait_fn_match = line_indicates_trait_regex.match(struct_line)
 796                         if trait_fn_match is not None:
 797                             trait_fn_lines.append((last_struct_block_comment, trait_fn_match))
 798                         field_var_match = line_field_var_regex.match(struct_line)
 799                         if field_var_match is not None:
 800                             field_var_lines.append(field_var_match)
 801                         field_lines.append(struct_line)
 802
 803                 assert(struct_name is not None)
 804                 assert(len(trait_fn_lines) == 0 or not (is_opaque or is_unitary_enum or is_union_enum or is_union or result_contents is not None or vec_ty is not None))
 805                 assert(not is_opaque or not (len(trait_fn_lines) != 0 or is_unitary_enum or is_union_enum or is_union or result_contents is not None or vec_ty is not None))
 806                 assert(not is_unitary_enum or not (len(trait_fn_lines) != 0 or is_opaque or is_union_enum or is_union or result_contents is not None or vec_ty is not None))
 807                 assert(not is_union_enum or not (len(trait_fn_lines) != 0 or is_unitary_enum or is_opaque or is_union or result_contents is not None or vec_ty is not None))
 808                 assert(not is_union or not (len(trait_fn_lines) != 0 or is_unitary_enum or is_union_enum or is_opaque or result_contents is not None or vec_ty is not None))
 809                 assert(result_contents is None or not (len(trait_fn_lines) != 0 or is_unitary_enum or is_union_enum or is_opaque or is_union or vec_ty is not None))
 810                 assert(vec_ty is None or not (len(trait_fn_lines) != 0 or is_unitary_enum or is_union_enum or is_opaque or is_union or result_contents is not None))
 811
 812                 if is_opaque:
 813                     opaque_structs.add(struct_name)
 814                     with open(f"{sys.argv[3]}/structs/{struct_name.replace('LDK', '')}{consts.file_ext}", "w") as out_java_struct:
 815                         out_opaque_struct_human = consts.map_opaque_struct(struct_name, last_block_comment)
 816                         last_block_comment = None
 817                         out_java_struct.write(out_opaque_struct_human)
 818                 elif result_contents is not None:
 819                     assert result_contents in result_ptr_struct_items
 820                     res_ty, err_ty = result_ptr_struct_items[result_contents]
 821                     map_result(struct_name, res_ty, err_ty)
 822                 elif struct_name.startswith("LDKCResult_") and struct_name.endswith("ZPtr"):
 823                     for line in field_lines:
 824                         if line.endswith("*result;"):
 825                             res_ty = line[:-8].strip()
 826                         elif line.endswith("*err;"):
 827                             err_ty = line[:-5].strip()
 828                     result_ptr_struct_items[struct_name] = (res_ty, err_ty)
 829                     result_types.add(struct_name[:-3])
 830                 elif is_tuple:
 831                     map_tuple(struct_name, field_lines)
 832                 elif vec_ty is not None:
 833                     ty_info = type_mapping_generator.map_type(vec_ty + " arr_elem", False, None, False, False)
 834                     if len(ty_info.java_fn_ty_arg) == 1: # ie we're a primitive of some form
 835                         out_java.write("\tpublic static native long " + struct_name + "_new(" + ty_info.java_ty + "[] elems);\n")
 836                         write_c(consts.c_fn_ty_pfx + consts.ptr_c_ty + " " + consts.c_fn_name_define_pfx(struct_name + "_new", True) + ty_info.c_ty + "Array elems) {\n")
 837                         write_c("\t" + struct_name + " *ret = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n")
 838                         write_c("\tret->datalen = " + consts.get_native_arr_len_call[0] + "elems" + consts.get_native_arr_len_call[1] + ";\n")
 839                         write_c("\tif (ret->datalen == 0) {\n")
 840                         write_c("\t\tret->data = NULL;\n")
 841                         write_c("\t} else {\n")
 842                         write_c("\t\tret->data = MALLOC(sizeof(" + vec_ty + ") * ret->datalen, \"" + struct_name + " Data\");\n")
 843                         native_arr_ptr_call = consts.get_native_arr_ptr_call(ty_info.ty_info)
 844                         write_c("\t\t" + ty_info.c_ty + " *java_elems = " + native_arr_ptr_call[0] + "elems" + native_arr_ptr_call[1] + ";\n")
 845                         write_c("\t\tfor (size_t i = 0; i < ret->datalen; i++) {\n")
 846                         if ty_info.arg_conv is not None:
 847                             write_c("\t\t\t" + ty_info.c_ty + " arr_elem = java_elems[i];\n")
 848                             write_c("\t\t\t" + ty_info.arg_conv.replace("\n", "\n\t\t\t") + "\n")
 849                             write_c("\t\t\tret->data[i] = " + ty_info.arg_conv_name + ";\n")
 850                             assert ty_info.arg_conv_cleanup is None
 851                         else:
 852                             write_c("\t\t\tret->data[i] = java_elems[i];\n")
 853                         write_c("\t\t}\n")
 854                         cleanup = consts.release_native_arr_ptr_call(ty_info.ty_info, "elems", "java_elems")
 855                         if cleanup is not None:
 856                             write_c("\t\t" + cleanup + ";\n")
 857                         write_c("\t}\n")
 858                         write_c("\treturn (uint64_t)ret;\n")
 859                         write_c("}\n")
 860
 861                     if ty_info.is_native_primitive:
 862                         clone_fns.add(struct_name.replace("LDK", "") + "_clone")
 863                         write_c("static inline " + struct_name + " " + struct_name.replace("LDK", "") + "_clone(const " + struct_name + " *orig) {\n")
 864                         write_c("\t" + struct_name + " ret = { .data = MALLOC(sizeof(" + ty_info.c_ty + ") * orig->datalen, \"" + struct_name + " clone bytes\"), .datalen = orig->datalen };\n")
 865                         write_c("\tmemcpy(ret.data, orig->data, sizeof(" + ty_info.c_ty + ") * ret.datalen);\n")
 866                         write_c("\treturn ret;\n}\n")
 867                     elif (ty_info.rust_obj.replace("LDK", "") + "_clone") in clone_fns:
 868                         ty_name = "CVec_" + ty_info.rust_obj.replace("LDK", "") + "Z";
 869                         clone_fns.add(ty_name + "_clone")
 870                         write_c("static inline " + struct_name + " " + ty_name + "_clone(const " + struct_name + " *orig) {\n")
 871                         write_c("\t" + struct_name + " ret = { .data = MALLOC(sizeof(" + ty_info.rust_obj + ") * orig->datalen, \"" + struct_name + " clone bytes\"), .datalen = orig->datalen };\n")
 872                         write_c("\tfor (size_t i = 0; i < ret.datalen; i++) {\n")
 873                         write_c("\t\tret.data[i] = " + ty_info.rust_obj.replace("LDK", "") + "_clone(&orig->data[i]);\n")
 874                         write_c("\t}\n\treturn ret;\n}\n")
 875                 elif is_union_enum:
 876                     assert(struct_name.endswith("_Tag"))
 877                     struct_name = struct_name[:-4]
 878                     union_enum_items[struct_name] = {"field_lines": field_lines}
 879                 elif struct_name.endswith("_Body") and struct_name.split("_")[0] in union_enum_items:
 880                     enum_var_name = struct_name.split("_")
 881                     union_enum_items[enum_var_name[0]][enum_var_name[1]] = field_lines
 882                 elif struct_name in union_enum_items:
 883                     tuple_variants = {}
 884                     elem_items = -1
 885                     for line in field_lines:
 886                         if line == "      struct {":
 887                             elem_items = 0
 888                         elif line == "      };":
 889                             elem_items = -1
 890                         elif elem_items > -1:
 891                             line = line.strip()
 892                             if line.startswith("struct "):
 893                                 line = line[7:]
 894                             elif line.startswith("enum "):
 895                                 line = line[5:]
 896                             split = line.split(" ")
 897                             assert len(split) == 2
 898                             tuple_variants[split[1].strip(";")] = split[0]
 899                             elem_items += 1
 900                             if elem_items > 1:
 901                                 # We don't currently support tuple variant with more than one element
 902                                 assert False
 903                     map_complex_enum(struct_name, union_enum_items[struct_name], tuple_variants, last_block_comment)
 904                     last_block_comment = None
 905                 elif is_unitary_enum:
 906                     map_unitary_enum(struct_name, field_lines, last_block_comment)
 907                     last_block_comment = None
 908                 elif len(trait_fn_lines) > 0:
 909                     map_trait(struct_name, field_var_lines, trait_fn_lines, last_block_comment)
 910                 elif struct_name == "LDKTxOut":
 911                     with open(f"{sys.argv[3]}/structs/TxOut{consts.file_ext}", "w") as out_java_struct:
 912                         out_java_struct.write(consts.hu_struct_file_prefix)
 913                         out_java_struct.write("public class TxOut extends CommonBase{\n")
 914                         out_java_struct.write("\tTxOut(java.lang.Object _dummy, long ptr) { super(ptr); }\n")
 915                         out_java_struct.write("\tlong to_c_ptr() { return 0; }\n")
 916                         out_java_struct.write("\t@Override @SuppressWarnings(\"deprecation\")\n")
 917                         out_java_struct.write("\tprotected void finalize() throws Throwable {\n")
 918                         out_java_struct.write("\t\tsuper.finalize();\n")
 919                         out_java_struct.write("\t\tif (ptr != 0) { bindings.TxOut_free(ptr); }\n")
 920                         out_java_struct.write("\t}\n")
 921                         # TODO: TxOut body
 922                         out_java_struct.write("}")
 923                 else:
 924                     pass # Everything remaining is a byte[] or some form
 925                 cur_block_obj = None
 926         else:
 927             fn_ptr = fn_ptr_regex.match(line)
 928             fn_ret_arr = fn_ret_arr_regex.match(line)
 929             reg_fn = reg_fn_regex.match(line)
 930             const_val = const_val_regex.match(line)
 931
 932             if line.startswith("#include <"):
 933                 pass
 934             elif line.startswith("/*"):
 935                 if not line.endswith("*/\n"):
 936                     block_comment = line.strip(" /*")
 937             elif line.startswith("typedef enum "):
 938                 cur_block_obj = line
 939             elif line.startswith("typedef struct "):
 940                 cur_block_obj = line
 941             elif line.startswith("typedef union "):
 942                 cur_block_obj = line
 943             elif fn_ptr is not None:
 944                 map_fn(line, fn_ptr, None, None, last_block_comment)
 945                 last_block_comment = None
 946             elif fn_ret_arr is not None:
 947                 map_fn(line, fn_ret_arr, fn_ret_arr.group(4), None, last_block_comment)
 948                 last_block_comment = None
 949             elif reg_fn is not None:
 950                 map_fn(line, reg_fn, None, None, last_block_comment)
 951                 last_block_comment = None
 952             elif const_val_regex is not None:
 953                 # TODO Map const variables
 954                 pass
 955             else:
 956                 assert(line == "\n")
 957
 958     out_java.write(consts.bindings_footer)
 959     for struct_name in opaque_structs:
 960         with open(f"{sys.argv[3]}/structs/{struct_name.replace('LDK', '')}{consts.file_ext}", "a") as out_java_struct:
 961             out_java_struct.write("}\n")
 962     for struct_name in trait_structs:
 963         with open(f"{sys.argv[3]}/structs/{struct_name.replace('LDK', '')}{consts.file_ext}", "a") as out_java_struct:
 964             out_java_struct.write("}\n")
 965     for struct_name in complex_enums:
 966         with open(f"{sys.argv[3]}/structs/{struct_name.replace('LDK', '').replace('COption', 'Option')}{consts.file_ext}", "a") as out_java_struct:
 967             out_java_struct.write("}\n")
 968     for struct_name in result_types:
 969         with open(f"{sys.argv[3]}/structs/{struct_name.replace('LDKCResult', 'Result')}{consts.file_ext}", "a") as out_java_struct:
 970             out_java_struct.write("}\n")
 971
 972 with open(sys.argv[4], "w") as out_c:
 973     out_c.write(consts.c_file_pfx.replace('<git_version_ldk_garbagecollected>', local_git_version))
 974     out_c.write(consts.init_str())
 975     out_c.write(c_file)
 976 with open(f"{sys.argv[3]}/structs/UtilMethods{consts.file_ext}", "a") as util:
 977     util.write(consts.util_fn_sfx)