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

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