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

   1 #!/usr/bin/env python3
   2 import os, 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 = os.getenv("LDK_GARBAGECOLLECTED_GIT_OVERRIDE")
  37 if local_git_version is None:
  38     local_git_version = subprocess.check_output(["git", "describe", '--tag', '--dirty']).decode("utf-8").strip()
  39
  40 from bindingstypes import *
  41
  42 c_file = ""
  43 def write_c(s):
  44     global c_file
  45     c_file += s
  46
  47 def camel_to_snake(s):
  48     # Convert camel case to snake case, in a way that appears to match cbindgen
  49     con = "_"
  50     ret = ""
  51     lastchar = ""
  52     lastund = False
  53     for char in s:
  54         if lastchar.isupper():
  55             if not char.isupper() and not lastund:
  56                 ret = ret + "_"
  57                 lastund = True
  58             else:
  59                 lastund = False
  60             ret = ret + lastchar.lower()
  61         else:
  62             ret = ret + lastchar
  63             if char.isupper() and not lastund:
  64                 ret = ret + "_"
  65                 lastund = True
  66             else:
  67                 lastund = False
  68         lastchar = char
  69         if char.isnumeric():
  70             lastund = True
  71     return (ret + lastchar.lower()).strip("_")
  72
  73 def doc_to_field_nullable(doc):
  74     if doc is None:
  75         return False
  76     for line in doc.splitlines():
  77         if "Note that this (or a relevant inner pointer) may be NULL or all-0s to represent None" in line:
  78             return True
  79     return False
  80
  81 def doc_to_params_ret_nullable(doc):
  82     if doc is None:
  83         return (set(), False)
  84     params = set()
  85     ret_null = False
  86     for line in doc.splitlines():
  87         if "may be NULL or all-0s to represent None" not in line:
  88             continue
  89         if "Note that the return value" in line:
  90             ret_null = True
  91         elif "Note that " in line:
  92             param = line.split("Note that ")[1].split(" ")[0]
  93             params.add(param)
  94     return (params, ret_null)
  95
  96 unitary_enums = set()
  97 # Map from enum name to "contains trait object"
  98 complex_enums = {}
  99 opaque_structs = set()
 100 trait_structs = {}
 101 result_types = set()
 102 tuple_types = {}
 103
 104 var_is_arr_regex = re.compile("\(\* ?([A-za-z0-9_]*)\)\[([a-z0-9]*)\]")
 105 var_ty_regex = re.compile("([A-za-z_0-9]*)(.*)")
 106 java_c_types_none_allowed = True # Unset when we do the real pass that populates the above sets
 107 def java_c_types(fn_arg, ret_arr_len):
 108     fn_arg = fn_arg.strip()
 109     if fn_arg.startswith("MUST_USE_RES "):
 110         fn_arg = fn_arg[13:]
 111     is_const = False
 112     if fn_arg.startswith("const "):
 113         fn_arg = fn_arg[6:]
 114         is_const = True
 115     if fn_arg.startswith("struct "):
 116         fn_arg = fn_arg[7:]
 117     if fn_arg.startswith("enum "):
 118         fn_arg = fn_arg[5:]
 119     nonnull_ptr = "NONNULL_PTR" in fn_arg
 120     fn_arg = fn_arg.replace("NONNULL_PTR", "")
 121
 122     is_ptr = False
 123     take_by_ptr = False
 124     rust_obj = None
 125     arr_access = None
 126     java_hu_ty = None
 127     if fn_arg.startswith("LDKThirtyTwoBytes"):
 128         fn_arg = "uint8_t (*" + fn_arg[18:] + ")[32]"
 129         assert var_is_arr_regex.match(fn_arg[8:])
 130         rust_obj = "LDKThirtyTwoBytes"
 131         arr_access = "data"
 132     elif fn_arg.startswith("LDKTxid"):
 133         fn_arg = "uint8_t (*" + fn_arg[8:] + ")[32]"
 134         assert var_is_arr_regex.match(fn_arg[8:])
 135         rust_obj = "LDKThirtyTwoBytes"
 136         arr_access = "data"
 137     elif fn_arg.startswith("LDKPublicKey"):
 138         fn_arg = "uint8_t (*" + fn_arg[13:] + ")[33]"
 139         assert var_is_arr_regex.match(fn_arg[8:])
 140         rust_obj = "LDKPublicKey"
 141         arr_access = "compressed_form"
 142     elif fn_arg.startswith("LDKSecretKey"):
 143         fn_arg = "uint8_t (*" + fn_arg[13:] + ")[32]"
 144         assert var_is_arr_regex.match(fn_arg[8:])
 145         rust_obj = "LDKSecretKey"
 146         arr_access = "bytes"
 147     elif fn_arg.startswith("LDKSignature"):
 148         fn_arg = "uint8_t (*" + fn_arg[13:] + ")[64]"
 149         assert var_is_arr_regex.match(fn_arg[8:])
 150         rust_obj = "LDKSignature"
 151         arr_access = "compact_form"
 152     elif fn_arg.startswith("LDKRecoverableSignature"):
 153         fn_arg = "uint8_t (*" + fn_arg[25:] + ")[68]"
 154         assert var_is_arr_regex.match(fn_arg[8:])
 155         rust_obj = "LDKRecoverableSignature"
 156         arr_access = "serialized_form"
 157     elif fn_arg.startswith("LDKThreeBytes"):
 158         fn_arg = "uint8_t (*" + fn_arg[14:] + ")[3]"
 159         assert var_is_arr_regex.match(fn_arg[8:])
 160         rust_obj = "LDKThreeBytes"
 161         arr_access = "data"
 162     elif fn_arg.startswith("LDKFourBytes"):
 163         fn_arg = "uint8_t (*" + fn_arg[13:] + ")[4]"
 164         assert var_is_arr_regex.match(fn_arg[8:])
 165         rust_obj = "LDKFourBytes"
 166         arr_access = "data"
 167     elif fn_arg.startswith("LDKSixteenBytes"):
 168         fn_arg = "uint8_t (*" + fn_arg[16:] + ")[16]"
 169         assert var_is_arr_regex.match(fn_arg[8:])
 170         rust_obj = "LDKSixteenBytes"
 171         arr_access = "data"
 172     elif fn_arg.startswith("LDKTwentyBytes"):
 173         fn_arg = "uint8_t (*" + fn_arg[15:] + ")[20]"
 174         assert var_is_arr_regex.match(fn_arg[8:])
 175         rust_obj = "LDKTwentyBytes"
 176         arr_access = "data"
 177     elif fn_arg.startswith("LDKTenBytes"):
 178         fn_arg = "uint8_t (*" + fn_arg[12:] + ")[10]"
 179         assert var_is_arr_regex.match(fn_arg[8:])
 180         rust_obj = "LDKTenBytes"
 181         arr_access = "data"
 182     elif fn_arg.startswith("LDKu8slice"):
 183         fn_arg = "uint8_t (*" + fn_arg[11:] + ")[datalen]"
 184         assert var_is_arr_regex.match(fn_arg[8:])
 185         rust_obj = "LDKu8slice"
 186         arr_access = "data"
 187     elif fn_arg.startswith("LDKCVec_u8Z"):
 188         fn_arg = "uint8_t (*" + fn_arg[12:] + ")[datalen]"
 189         rust_obj = "LDKCVec_u8Z"
 190         assert var_is_arr_regex.match(fn_arg[8:])
 191         arr_access = "data"
 192     elif fn_arg.startswith("LDKTransaction ") or fn_arg == "LDKTransaction":
 193         fn_arg = "uint8_t (*" + fn_arg[15:] + ")[datalen]"
 194         rust_obj = "LDKTransaction"
 195         assert var_is_arr_regex.match(fn_arg[8:])
 196         arr_access = "data"
 197     elif fn_arg.startswith("LDKCVec_"):
 198         is_ptr = False
 199         if "*" in fn_arg:
 200             fn_arg = fn_arg.replace("*", "")
 201             is_ptr = True
 202
 203         tyn = fn_arg[8:].split(" ")
 204         assert tyn[0].endswith("Z")
 205         if tyn[0] == "u64Z":
 206             new_arg = "uint64_t"
 207         else:
 208             new_arg = "LDK" + tyn[0][:-1]
 209         for a in tyn[1:]:
 210             new_arg = new_arg + " " + a
 211         res = java_c_types(new_arg, ret_arr_len)
 212         if res is None:
 213             assert java_c_types_none_allowed
 214             return None
 215         if is_ptr:
 216             res.pass_by_ref = True
 217         if res.is_native_primitive or res.passed_as_ptr:
 218             return TypeInfo(rust_obj=fn_arg.split(" ")[0], java_ty=res.java_ty + "[]", java_hu_ty=res.java_hu_ty + "[]",
 219                 java_fn_ty_arg="[" + res.java_fn_ty_arg, c_ty=res.c_ty + "Array", passed_as_ptr=False, is_ptr=is_ptr,
 220                 nonnull_ptr=nonnull_ptr, is_const=is_const,
 221                 var_name=res.var_name, arr_len="datalen", arr_access="data", subty=res, is_native_primitive=False)
 222         else:
 223             return TypeInfo(rust_obj=fn_arg.split(" ")[0], java_ty=res.java_ty + "[]", java_hu_ty=res.java_hu_ty + "[]",
 224                 java_fn_ty_arg="[" + res.java_fn_ty_arg, c_ty=consts.ptr_arr, passed_as_ptr=False, is_ptr=is_ptr,
 225                 nonnull_ptr=nonnull_ptr, is_const=is_const,
 226                 var_name=res.var_name, arr_len="datalen", arr_access="data", subty=res, is_native_primitive=False)
 227
 228     is_primitive = False
 229     contains_trait = False
 230     arr_len = None
 231     mapped_type = []
 232     java_type_plural = None
 233     if fn_arg.startswith("void"):
 234         java_ty = "void"
 235         c_ty = "void"
 236         fn_ty_arg = "V"
 237         fn_arg = fn_arg[4:].strip()
 238         is_primitive = True
 239     elif fn_arg.startswith("bool"):
 240         java_ty = "boolean"
 241         c_ty = "jboolean"
 242         fn_ty_arg = "Z"
 243         fn_arg = fn_arg[4:].strip()
 244         is_primitive = True
 245     elif fn_arg.startswith("uint8_t"):
 246         mapped_type = consts.c_type_map['uint8_t']
 247         java_ty = mapped_type[0]
 248         c_ty = "int8_t"
 249         fn_ty_arg = "B"
 250         fn_arg = fn_arg[7:].strip()
 251         is_primitive = True
 252     elif fn_arg.startswith("LDKu5"):
 253         java_ty = consts.c_type_map['uint8_t'][0]
 254         java_hu_ty = "UInt5"
 255         rust_obj = "LDKu5"
 256         c_ty = "int8_t"
 257         fn_ty_arg = "B"
 258         fn_arg = fn_arg[6:].strip()
 259     elif fn_arg.startswith("uint16_t"):
 260         mapped_type = consts.c_type_map['uint16_t']
 261         java_ty = mapped_type[0]
 262         c_ty = "int16_t"
 263         fn_ty_arg = "S"
 264         fn_arg = fn_arg[8:].strip()
 265         is_primitive = True
 266     elif fn_arg.startswith("uint32_t"):
 267         mapped_type = consts.c_type_map['uint32_t']
 268         java_ty = mapped_type[0]
 269         c_ty = "int32_t"
 270         fn_ty_arg = "I"
 271         fn_arg = fn_arg[8:].strip()
 272         is_primitive = True
 273     elif fn_arg.startswith("uint64_t") or fn_arg.startswith("uintptr_t"):
 274         # TODO: uintptr_t is arch-dependent :(
 275         mapped_type = consts.c_type_map['uint64_t']
 276         java_ty = mapped_type[0]
 277         fn_ty_arg = "J"
 278         if fn_arg.startswith("uint64_t"):
 279             c_ty = "int64_t"
 280             fn_arg = fn_arg[8:].strip()
 281         else:
 282             c_ty = "int64_t"
 283             rust_obj = "uintptr_t"
 284             fn_arg = fn_arg[9:].strip()
 285         is_primitive = True
 286     elif is_const and fn_arg.startswith("char *"):
 287         java_ty = "String"
 288         c_ty = "const char*"
 289         fn_ty_arg = "Ljava/lang/String;"
 290         fn_arg = fn_arg[6:].strip()
 291     elif fn_arg.startswith("LDKStr"):
 292         rust_obj = "LDKStr"
 293         java_ty = "String"
 294         c_ty = "jstring"
 295         fn_ty_arg = "Ljava/lang/String;"
 296         fn_arg = fn_arg[6:].strip()
 297         arr_access = "chars"
 298         arr_len = "len"
 299     else:
 300         ma = var_ty_regex.match(fn_arg)
 301         if ma.group(1).strip() in unitary_enums:
 302             assert ma.group(1).strip().startswith("LDK")
 303             java_ty = ma.group(1).strip()[3:]
 304             java_hu_ty = java_ty
 305             c_ty = consts.result_c_ty
 306             fn_ty_arg = "Lorg/ldk/enums/" + java_ty + ";"
 307             fn_arg = ma.group(2).strip()
 308             rust_obj = ma.group(1).strip()
 309         else:
 310             c_ty = consts.ptr_c_ty
 311             java_ty = consts.ptr_native_ty
 312             java_hu_ty = ma.group(1).strip()
 313             java_hu_ty = java_hu_ty.replace("LDKCOption", "Option")
 314             java_hu_ty = java_hu_ty.replace("LDKCResult", "Result")
 315             java_hu_ty = java_hu_ty.replace("LDKC2Tuple", "TwoTuple")
 316             java_hu_ty = java_hu_ty.replace("LDKC3Tuple", "ThreeTuple")
 317             java_hu_ty = java_hu_ty.replace("LDK", "")
 318             fn_ty_arg = "J"
 319             fn_arg = ma.group(2).strip()
 320             rust_obj = ma.group(1).strip()
 321             if rust_obj in trait_structs:
 322                 contains_trait = True
 323             elif rust_obj in complex_enums:
 324                 contains_trait = complex_enums[rust_obj]
 325             take_by_ptr = True
 326
 327     if fn_arg.startswith(" *") or fn_arg.startswith("*"):
 328         fn_arg = fn_arg.replace("*", "").strip()
 329         is_ptr = True
 330         c_ty = consts.ptr_c_ty
 331         java_ty = consts.ptr_native_ty
 332         fn_ty_arg = "J"
 333
 334     var_is_arr = var_is_arr_regex.match(fn_arg)
 335     if var_is_arr is not None or ret_arr_len is not None:
 336         assert(not take_by_ptr)
 337         assert(not is_ptr)
 338         # is there a special case for plurals?
 339         if len(mapped_type) == 2:
 340             java_ty = mapped_type[1]
 341         else:
 342             java_ty = java_ty + "[]"
 343         c_ty = c_ty + "Array"
 344         if var_is_arr is not None:
 345             if var_is_arr.group(1) == "":
 346                 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,
 347                     passed_as_ptr=False, is_ptr=False, nonnull_ptr=nonnull_ptr, var_name="arg",
 348                     arr_len=var_is_arr.group(2), arr_access=arr_access, is_native_primitive=False, contains_trait=contains_trait)
 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=var_is_arr.group(1),
 351                 arr_len=var_is_arr.group(2), arr_access=arr_access, is_native_primitive=False, contains_trait=contains_trait)
 352
 353     if java_hu_ty is None:
 354         java_hu_ty = java_ty
 355     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,
 356         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,
 357         contains_trait=contains_trait)
 358
 359 fn_ptr_regex = re.compile("^extern const ([A-Za-z_0-9\* ]*) \(\*(.*)\)\((.*)\);$")
 360 fn_ret_arr_regex = re.compile("(.*) \(\*(.*)\((.*)\)\)\[([0-9]*)\];$")
 361 reg_fn_regex = re.compile("([A-Za-z_0-9\* ]* \*?)([a-zA-Z_0-9]*)\((.*)\);$")
 362 clone_fns = set()
 363 constructor_fns = {}
 364
 365 from gen_type_mapping import TypeMappingGenerator
 366 type_mapping_generator = TypeMappingGenerator(java_c_types, consts, opaque_structs, clone_fns, unitary_enums, trait_structs, complex_enums, result_types, tuple_types)
 367
 368 with open(sys.argv[1]) as in_h:
 369     for line in in_h:
 370         reg_fn = reg_fn_regex.match(line)
 371         if reg_fn is not None:
 372             if reg_fn.group(2).endswith("_clone"):
 373                 clone_fns.add(reg_fn.group(2))
 374             else:
 375                 rty = java_c_types(reg_fn.group(1), None)
 376                 if rty is not None and not rty.is_native_primitive and reg_fn.group(2) == rty.java_hu_ty + "_new":
 377                     constructor_fns[rty.rust_obj] = reg_fn.group(3)
 378             continue
 379         arr_fn = fn_ret_arr_regex.match(line)
 380         if arr_fn is not None:
 381             if arr_fn.group(2).endswith("_clone"):
 382                 clone_fns.add(arr_fn.group(2))
 383             # No object constructors return arrays, as then they wouldn't be an object constructor
 384             continue
 385
 386 # Define some manual clones...
 387 clone_fns.add("ThirtyTwoBytes_clone")
 388 write_c("static inline struct LDKThirtyTwoBytes ThirtyTwoBytes_clone(const struct LDKThirtyTwoBytes *orig) { struct LDKThirtyTwoBytes ret; memcpy(ret.data, orig->data, 32); return ret; }\n")
 389
 390 java_c_types_none_allowed = False # C structs created by cbindgen are declared in dependency order
 391
 392 with open(f"{sys.argv[3]}/structs/UtilMethods{consts.file_ext}", "a") as util:
 393     util.write(consts.util_fn_pfx)
 394
 395 with open(sys.argv[1]) as in_h, open(f"{sys.argv[2]}/bindings{consts.file_ext}", "w") as out_java:
 396     # Map a top-level function
 397     def map_fn(line, re_match, ret_arr_len, c_call_string, doc_comment):
 398         map_fn_with_ref_option(line, re_match, ret_arr_len, c_call_string, doc_comment, False)
 399     def map_fn_with_ref_option(line, re_match, ret_arr_len, c_call_string, doc_comment, force_holds_ref):
 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         if method_name.startswith("__"):
 406             return
 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             expected_struct = "LDKC" + struct_meth
 412             struct_meth_name = method_name[len(struct_meth) + 1:].strip("_")
 413         elif method_name.startswith("C2Tuple"):
 414             tuple_name = method_name.rsplit("Z", 1)[0][2:] + "Z"
 415             struct_meth = "Two" + tuple_name
 416             expected_struct = "LDKC2" + tuple_name
 417             struct_meth_name = method_name[len(tuple_name) + 2:].strip("_")
 418         else:
 419             struct_meth = method_name.split("_")[0]
 420             expected_struct = "LDK" + struct_meth
 421             struct_meth_name = method_name[len(struct_meth) + 1 if len(struct_meth) != 0 else 0:].strip("_")
 422
 423         (params_nullable, ret_nullable) = doc_to_params_ret_nullable(doc_comment)
 424         if ret_nullable:
 425             return_type_info = type_mapping_generator.map_nullable_type(method_return_type.strip() + " ret", True, ret_arr_len, False, force_holds_ref)
 426         else:
 427             return_type_info = type_mapping_generator.map_type(method_return_type.strip() + " ret", True, ret_arr_len, False, force_holds_ref)
 428
 429         argument_types = []
 430         default_constructor_args = {}
 431         takes_self = False
 432         takes_self_ptr = False
 433         args_known = True
 434
 435         for argument_index, argument in enumerate(method_arguments):
 436             arg_ty = type_mapping_generator.java_c_types(argument, None)
 437             argument_conversion_info = None
 438             if argument_index == 0 and arg_ty.java_hu_ty == struct_meth:
 439                 argument_conversion_info = type_mapping_generator.map_type_with_info(arg_ty, False, None, is_free, True, False)
 440                 takes_self = True
 441                 if argument_conversion_info.ty_info.is_ptr:
 442                     takes_self_ptr = True
 443             elif arg_ty.var_name in params_nullable:
 444                 argument_conversion_info = type_mapping_generator.map_type_with_info(arg_ty, False, None, is_free, True, True)
 445                 if argument_conversion_info.arg_conv is not None and "Warning" in argument_conversion_info.arg_conv:
 446                     arg_ty_info = java_c_types(argument, None)
 447                     print("WARNING: Remapping argument " + arg_ty_info.var_name + " of function " + method_name + " to a reference")
 448                     print("    The argument appears to require a move, or not clonable, and is nullable.")
 449                     print("    Normally for arguments that require a move and are not clonable, we split")
 450                     print("    the argument into the type's constructor's arguments and just use those to")
 451                     print("    construct a new object on the fly.")
 452                     print("    However, because the object is nullable, doing so would mean we can no")
 453                     print("    longer allow the user to pass null, as we now have an argument list instead.")
 454                     print("    Thus, we blindly assume its really an Option<&Type> instead of an Option<Type>.")
 455                     print("    It may or may not actually be a reference, but its the simplest mapping option")
 456                     print("    and also the only use of this code today.")
 457                     arg_ty_info.requires_clone = False
 458                     argument_conversion_info = type_mapping_generator.map_type_with_info(arg_ty_info, False, None, is_free, True, True)
 459                     assert argument_conversion_info.nullable
 460                     assert argument_conversion_info.arg_conv is not None and "Warning" not in argument_conversion_info.arg_conv
 461             else:
 462                 argument_conversion_info = type_mapping_generator.map_type_with_info(arg_ty, False, None, is_free, True, False)
 463
 464             if argument_conversion_info.arg_conv is not None and "Warning" in argument_conversion_info.arg_conv:
 465                 if argument_conversion_info.rust_obj in constructor_fns:
 466                     assert not is_free
 467                     for explode_arg in constructor_fns[argument_conversion_info.rust_obj].split(','):
 468                         explode_arg_conv = type_mapping_generator.map_type(explode_arg, False, None, False, True)
 469                         if explode_arg_conv.c_ty == "void":
 470                             # We actually want to handle this case, but for now its only used in NetGraphMsgHandler::new()
 471                             # which ends up resulting in a redundant constructor - both without arguments for the NetworkGraph.
 472                             args_known = False
 473                             pass
 474                         if not argument_conversion_info.arg_name in default_constructor_args:
 475                             default_constructor_args[argument_conversion_info.arg_name] = []
 476                         default_constructor_args[argument_conversion_info.arg_name].append(explode_arg_conv)
 477             argument_types.append(argument_conversion_info)
 478         if not takes_self and return_type_info.java_hu_ty != struct_meth:
 479             if not return_type_info.java_hu_ty.startswith("Result_" + struct_meth):
 480                 struct_meth_name = method_name
 481                 struct_meth = ""
 482                 expected_struct = ""
 483
 484         out_java.write("\t// " + line)
 485         (out_java_delta, out_c_delta, out_java_struct_delta) = \
 486             consts.map_function(argument_types, c_call_string, method_name, struct_meth_name, return_type_info, struct_meth, default_constructor_args, takes_self, takes_self_ptr, args_known, type_mapping_generator, doc_comment)
 487         out_java.write(out_java_delta)
 488
 489         if is_free:
 490             assert len(argument_types) == 1
 491             assert return_type_info.c_ty == "void"
 492             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")
 493             if argument_types[0].ty_info.passed_as_ptr and not argument_types[0].ty_info.rust_obj in opaque_structs:
 494                 write_c("\tif ((" + argument_types[0].ty_info.var_name + " & 1) != 0) return;\n")
 495
 496             for info in argument_types:
 497                 if info.arg_conv is not None:
 498                     write_c("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
 499             assert c_call_string is None
 500             write_c("\t" + method_name + "(")
 501             if argument_types[0].arg_conv_name is not None:
 502                 write_c(argument_types[0].arg_conv_name)
 503             write_c(");")
 504             for info in argument_types:
 505                 if info.arg_conv_cleanup is not None:
 506                     write_c("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
 507             write_c("\n}\n\n")
 508         else:
 509             write_c(out_c_delta)
 510
 511         out_java_struct = None
 512         if (expected_struct in opaque_structs or expected_struct in trait_structs
 513                 or expected_struct in complex_enums or expected_struct in complex_enums
 514                 or expected_struct in result_types or expected_struct in tuple_types) and not is_free:
 515             out_java_struct = open(f"{sys.argv[3]}/structs/{struct_meth}{consts.file_ext}", "a")
 516             out_java_struct.write(out_java_struct_delta)
 517         elif (not is_free and not method_name.endswith("_clone") and
 518                 not method_name.startswith("TxOut") and
 519                 not method_name.startswith("_") and
 520                 method_name != "check_platform" and method_name != "Result_read" and
 521                 not expected_struct in unitary_enums and
 522                 ((not method_name.startswith("C2Tuple_") and not method_name.startswith("C3Tuple_"))
 523                   or method_name.endswith("_read"))):
 524             out_java_struct = open(f"{sys.argv[3]}/structs/UtilMethods{consts.file_ext}", "a")
 525             for line in out_java_struct_delta.splitlines():
 526                 if not line.strip().startswith("this."):
 527                     out_java_struct.write(line + "\n")
 528                 else:
 529                     out_java_struct.write("\t\t// " + line.strip() + "\n")
 530
 531     def map_unitary_enum(struct_name, field_lines, enum_doc_comment):
 532         assert struct_name.startswith("LDK")
 533         with open(f"{sys.argv[3]}/enums/{struct_name[3:]}{consts.file_ext}", "w") as out_java_enum:
 534             unitary_enums.add(struct_name)
 535             for idx, (struct_line, _) in enumerate(field_lines):
 536                 if idx == 0:
 537                     assert(struct_line == "typedef enum %s {" % struct_name)
 538                 elif idx == len(field_lines) - 3:
 539                     assert(struct_line.endswith("_Sentinel,"))
 540                 elif idx == len(field_lines) - 2:
 541                     assert(struct_line == "} %s;" % struct_name)
 542                 elif idx == len(field_lines) - 1:
 543                     assert(struct_line == "")
 544             assert struct_name.startswith("LDK")
 545             (c_out, native_file_out, native_out) = consts.native_c_unitary_enum_map(struct_name[3:], [(x.strip().strip(","), y) for x, y in field_lines[1:-3]], enum_doc_comment)
 546             write_c(c_out)
 547             out_java_enum.write(native_file_out)
 548             out_java.write(native_out)
 549
 550     def map_complex_enum(struct_name, union_enum_items, inline_enum_variants, enum_doc_comment):
 551         java_hu_type = struct_name.replace("LDK", "").replace("COption", "Option")
 552
 553         enum_variants = []
 554         tag_field_lines = union_enum_items["field_lines"]
 555         contains_trait = False
 556         for idx, (struct_line, variant_docs) in enumerate(tag_field_lines):
 557             if idx == 0:
 558                 assert(struct_line == "typedef enum %s_Tag {" % struct_name)
 559             elif idx == len(tag_field_lines) - 3:
 560                 assert(struct_line.endswith("_Sentinel,"))
 561             elif idx == len(tag_field_lines) - 2:
 562                 assert(struct_line == "} %s_Tag;" % struct_name)
 563             elif idx == len(tag_field_lines) - 1:
 564                 assert(struct_line == "")
 565             else:
 566                 variant_name = struct_line.strip(' ,')[len(struct_name) + 1:]
 567                 fields = []
 568                 if "LDK" + variant_name in union_enum_items:
 569                     enum_var_lines = union_enum_items["LDK" + variant_name]
 570                     for idx, (field, field_docs) in enumerate(enum_var_lines):
 571                         if idx != 0 and idx < len(enum_var_lines) - 2 and field.strip() != "":
 572                             field_ty = type_mapping_generator.java_c_types(field.strip(' ;'), None)
 573                             contains_trait |= field_ty.contains_trait
 574                             if field_docs is not None and doc_to_field_nullable(field_docs):
 575                                 field_conv = type_mapping_generator.map_type_with_info(field_ty, False, None, False, True, True)
 576                             else:
 577                                 field_conv = type_mapping_generator.map_type_with_info(field_ty, False, None, False, True, False)
 578                             fields.append((field_conv, field_docs))
 579                     enum_variants.append(ComplexEnumVariantInfo(variant_name, variant_docs, fields, False))
 580                 elif camel_to_snake(variant_name) in inline_enum_variants:
 581                     # TODO: If we ever have a rust enum Variant(Option<Struct>) we need to pipe
 582                     # docs through to there, and then potentially mark the field nullable.
 583                     mapped = type_mapping_generator.map_type(inline_enum_variants[camel_to_snake(variant_name)] + " " + camel_to_snake(variant_name), False, None, False, True)
 584                     contains_trait |= mapped.ty_info.contains_trait
 585                     fields.append((mapped, None))
 586                     enum_variants.append(ComplexEnumVariantInfo(variant_name, variant_docs, fields, True))
 587                 else:
 588                     enum_variants.append(ComplexEnumVariantInfo(variant_name, variant_docs, fields, True))
 589         complex_enums[struct_name] = contains_trait
 590
 591         with open(f"{sys.argv[3]}/structs/{java_hu_type}{consts.file_ext}", "w") as out_java_enum:
 592             (out_java_addendum, out_java_enum_addendum, out_c_addendum) = consts.map_complex_enum(struct_name, enum_variants, camel_to_snake, enum_doc_comment)
 593
 594             out_java_enum.write(out_java_enum_addendum)
 595             out_java.write(out_java_addendum)
 596             write_c(out_c_addendum)
 597
 598     def map_trait(struct_name, field_var_lines, trait_fn_lines, trait_doc_comment):
 599         with open(f"{sys.argv[3]}/structs/{struct_name.replace('LDK', '')}{consts.file_ext}", "w") as out_java_trait:
 600             field_var_convs = []
 601             flattened_field_var_convs = []
 602             for var_line in field_var_lines:
 603                 if var_line.group(1) in trait_structs:
 604                     field_var_convs.append((var_line.group(1), var_line.group(2), trait_structs[var_line.group(1)]))
 605                     flattened_field_var_convs.append((var_line.group(1), var_line.group(2), ))
 606                     flattened_field_var_convs.extend(trait_structs[var_line.group(1)])
 607                 else:
 608                     mapped = type_mapping_generator.map_type(var_line.group(1) + " " + var_line.group(2), False, None, False, False)
 609                     field_var_convs.append(mapped)
 610                     flattened_field_var_convs.append(mapped)
 611             trait_structs[struct_name] = field_var_convs
 612
 613             field_fns = []
 614             for fn_docs, fn_line in trait_fn_lines:
 615                 if fn_line == "cloned":
 616                     ret_ty_info = type_mapping_generator.map_type("void", True, None, False, False)
 617                     field_fns.append(TraitMethInfo("cloned", False, ret_ty_info, [], fn_docs))
 618                 else:
 619                     (nullable_params, ret_nullable) = doc_to_params_ret_nullable(fn_docs)
 620                     if ret_nullable:
 621                         assert False # This isn't yet handled on the Java side
 622                         ret_ty_info.nullable = True
 623                         ret_ty_info = type_mapping_generator.map_nullable_type(fn_line.group(2).strip() + " ret", True, None, False, False)
 624                     else:
 625                         ret_ty_info = type_mapping_generator.map_type(fn_line.group(2).strip() + " ret", True, None, False, False)
 626                     is_const = fn_line.group(4) is not None
 627
 628                     arg_tys = []
 629                     for idx, arg in enumerate(fn_line.group(5).split(',')):
 630                         if arg == "":
 631                             continue
 632                         arg_ty_info = type_mapping_generator.java_c_types(arg, None)
 633                         if arg_ty_info.var_name in nullable_params:
 634                             # Types that are actually null instead of all-0s aren't yet handled on the Java side:
 635                             arg_conv_info = type_mapping_generator.map_type_with_info(arg_ty_info, True, None, False, False, True)
 636                         else:
 637                             arg_conv_info = type_mapping_generator.map_type_with_info(arg_ty_info, True, None, False, False, False)
 638                         arg_tys.append(arg_conv_info)
 639                     field_fns.append(TraitMethInfo(fn_line.group(3), is_const, ret_ty_info, arg_tys, fn_docs))
 640
 641             (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)
 642             write_c(out_c_addendum)
 643             out_java_trait.write(out_java_trait_addendum)
 644             out_java.write(out_java_addendum)
 645
 646         for fn_docs, fn_line in trait_fn_lines:
 647             if fn_line == "cloned":
 648                 continue
 649             # For now, just disable enabling the _call_log - we don't know how to inverse-map String
 650             is_log = fn_line.group(3) == "log" and struct_name == "LDKLogger"
 651             if fn_line.group(3) != "free" and fn_line.group(3) != "eq" and not is_log:
 652                 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"
 653                 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)
 654         for idx, var_line in enumerate(field_var_lines):
 655             if var_line.group(1) not in trait_structs:
 656                 write_c(var_line.group(1) + " " + struct_name + "_set_get_" + var_line.group(2) + "(" + struct_name + "* this_arg) {\n")
 657                 write_c("\tif (this_arg->set_" + var_line.group(2) + " != NULL)\n")
 658                 write_c("\t\tthis_arg->set_" + var_line.group(2) + "(this_arg);\n")
 659                 write_c("\treturn this_arg->" + var_line.group(2) + ";\n")
 660                 write_c("}\n")
 661                 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"
 662                 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)
 663
 664     def map_result(struct_name, res_ty, err_ty):
 665         result_types.add(struct_name)
 666         human_ty = struct_name.replace("LDKCResult", "Result")
 667         with open(f"{sys.argv[3]}/structs/{human_ty}{consts.file_ext}", "w") as out_java_struct:
 668             out_java_struct.write(consts.hu_struct_file_prefix)
 669             out_java_struct.write("public class " + human_ty + " extends CommonBase {\n")
 670             out_java_struct.write("\tprivate " + human_ty + "(Object _dummy, long ptr) { super(ptr); }\n")
 671             out_java_struct.write("\tprotected void finalize() throws Throwable {\n")
 672             out_java_struct.write("\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); } super.finalize();\n")
 673             out_java_struct.write("\t}\n\n")
 674             out_java_struct.write("\tstatic " + human_ty + " constr_from_ptr(long ptr) {\n")
 675             out_java_struct.write("\t\tif (bindings." + struct_name.replace("LDK", "") + "_is_ok(ptr)) {\n")
 676             out_java_struct.write("\t\t\treturn new " + human_ty + "_OK(null, ptr);\n")
 677             out_java_struct.write("\t\t} else {\n")
 678             out_java_struct.write("\t\t\treturn new " + human_ty + "_Err(null, ptr);\n")
 679             out_java_struct.write("\t\t}\n")
 680             out_java_struct.write("\t}\n")
 681
 682             res_map = type_mapping_generator.map_type(res_ty + " res", True, None, False, True)
 683             err_map = type_mapping_generator.map_type(err_ty + " err", True, None, False, True)
 684             can_clone = True
 685             if not res_map.is_native_primitive and (res_map.rust_obj.replace("LDK", "") + "_clone" not in clone_fns):
 686                 can_clone = False
 687             if not err_map.is_native_primitive and (err_map.rust_obj.replace("LDK", "") + "_clone" not in clone_fns):
 688                 can_clone = False
 689
 690             out_java.write("\tpublic static native " + res_map.java_ty + " " + struct_name + "_get_ok(long arg);\n")
 691             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")
 692             write_c("\t" + struct_name + " *val = (" + struct_name + "*)(arg & ~1);\n")
 693             write_c("\tCHECK(val->result_ok);\n\t")
 694             out_java_struct.write("\tpublic static final class " + human_ty + "_OK extends " + human_ty + " {\n")
 695             if res_map.ret_conv is not None:
 696                 write_c(res_map.ret_conv[0].replace("\n", "\n\t") + "(*val->contents.result)")
 697                 write_c(res_map.ret_conv[1].replace("\n", "\n\t") + "\n\treturn " + res_map.ret_conv_name)
 698             else:
 699                 write_c("return *val->contents.result")
 700             write_c(";\n}\n")
 701
 702             if res_map.java_hu_ty != "void":
 703                 out_java_struct.write("\t\tpublic final " + res_map.java_hu_ty + " res;\n")
 704             out_java_struct.write("\t\tprivate " + human_ty + "_OK(Object _dummy, long ptr) {\n")
 705             out_java_struct.write("\t\t\tsuper(_dummy, ptr);\n")
 706             if res_map.java_hu_ty == "void":
 707                 pass
 708             elif res_map.to_hu_conv is not None:
 709                 out_java_struct.write("\t\t\t" + res_map.java_ty + " res = bindings." + struct_name + "_get_ok(ptr);\n")
 710                 out_java_struct.write("\t\t\t" + res_map.to_hu_conv.replace("\n", "\n\t\t\t"))
 711                 out_java_struct.write("\n\t\t\tthis.res = " + res_map.to_hu_conv_name + ";\n")
 712             else:
 713                 out_java_struct.write("\t\t\tthis.res = bindings." + struct_name + "_get_ok(ptr);\n")
 714             out_java_struct.write("\t\t}\n")
 715             out_java_struct.write("\t}\n\n")
 716
 717             out_java.write("\tpublic static native " + err_map.java_ty + " " + struct_name + "_get_err(long arg);\n")
 718             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")
 719             write_c("\t" + struct_name + " *val = (" + struct_name + "*)(arg & ~1);\n")
 720             write_c("\tCHECK(!val->result_ok);\n\t")
 721             out_java_struct.write("\tpublic static final class " + human_ty + "_Err extends " + human_ty + " {\n")
 722             if err_map.ret_conv is not None:
 723                 write_c(err_map.ret_conv[0].replace("\n", "\n\t") + "(*val->contents.err)")
 724                 write_c(err_map.ret_conv[1].replace("\n", "\n\t") + "\n\treturn " + err_map.ret_conv_name)
 725             else:
 726                 write_c("return *val->contents.err")
 727             write_c(";\n}\n")
 728
 729             if err_map.java_hu_ty != "void":
 730                 out_java_struct.write("\t\tpublic final " + err_map.java_hu_ty + " err;\n")
 731             out_java_struct.write("\t\tprivate " + human_ty + "_Err(Object _dummy, long ptr) {\n")
 732             out_java_struct.write("\t\t\tsuper(_dummy, ptr);\n")
 733             if err_map.java_hu_ty == "void":
 734                 pass
 735             elif err_map.to_hu_conv is not None:
 736                 out_java_struct.write("\t\t\t" + err_map.java_ty + " err = bindings." + struct_name + "_get_err(ptr);\n")
 737                 out_java_struct.write("\t\t\t" + err_map.to_hu_conv.replace("\n", "\n\t\t\t"))
 738                 out_java_struct.write("\n\t\t\tthis.err = " + err_map.to_hu_conv_name + ";\n")
 739             else:
 740                 out_java_struct.write("\t\t\tthis.err = bindings." + struct_name + "_get_err(ptr);\n")
 741             out_java_struct.write("\t\t}\n")
 742
 743             out_java_struct.write("\t}\n\n")
 744
 745     def map_tuple(struct_name, field_lines):
 746         human_ty = struct_name.replace("LDKC2Tuple", "TwoTuple").replace("LDKC3Tuple", "ThreeTuple")
 747         with open(f"{sys.argv[3]}/structs/{human_ty}{consts.file_ext}", "w") as out_java_struct:
 748             out_java_struct.write(consts.map_tuple(struct_name))
 749             ty_list = []
 750             for idx, (line, _) in enumerate(field_lines):
 751                 if idx != 0 and idx < len(field_lines) - 2:
 752                     ty_list.append(java_c_types(line.strip(';'), None))
 753             tuple_types[struct_name] = (ty_list, struct_name)
 754
 755         # Map virtual getter functions
 756         for idx, (line, _) in enumerate(field_lines):
 757             if idx != 0 and idx < len(field_lines) - 2:
 758                 field_name = chr(ord('a') + idx - 1)
 759                 assert line.endswith(" " + field_name + ";")
 760                 field_ty = java_c_types(line[:-1], None)
 761                 ptr_fn_defn = line[:-3].strip() + " *" + struct_name.replace("LDK", "") + "_get_" + field_name + "(" + struct_name + " *NONNULL_PTR tuple)"
 762                 owned_fn_defn = line[:-3].strip() + " " + struct_name.replace("LDK", "") + "_get_" + field_name + "(" + struct_name + " *NONNULL_PTR tuple)"
 763
 764                 holds_ref = False
 765                 if field_ty.rust_obj is not None and field_ty.rust_obj.replace("LDK", "") + "_clone" in clone_fns:
 766                     fn_defn = owned_fn_defn
 767                     write_c("static inline " + fn_defn + "{\n")
 768                     write_c("\treturn " + field_ty.rust_obj.replace("LDK", "") + "_clone(&tuple->" + field_name + ");\n")
 769                 elif field_ty.arr_len is not None or field_ty.is_native_primitive:
 770                     fn_defn = owned_fn_defn
 771                     write_c("static inline " + fn_defn + "{\n")
 772                     write_c("\treturn tuple->" + field_name + ";\n")
 773                 else:
 774                     fn_defn = ptr_fn_defn
 775                     write_c("static inline " + fn_defn + "{\n")
 776                     write_c("\treturn &tuple->" + field_name + ";\n")
 777                     holds_ref = True
 778                 write_c("}\n")
 779                 dummy_line = fn_defn + ";\n"
 780                 map_fn_with_ref_option(dummy_line, reg_fn_regex.match(dummy_line), None, None, "", holds_ref)
 781
 782     out_java.write(consts.bindings_header)
 783     with open(f"{sys.argv[2]}/version{consts.file_ext}", "w") as out_java_version:
 784         out_java_version.write(consts.bindings_version_file.replace('<git_version_ldk_garbagecollected>', local_git_version))
 785
 786     with open(f"{sys.argv[3]}/structs/CommonBase{consts.file_ext}", "w") as out_java_struct:
 787         out_java_struct.write(consts.common_base)
 788
 789     block_comment = None
 790     last_block_comment = None
 791     cur_block_obj = None
 792
 793     const_val_regex = re.compile("^extern const ([A-Za-z_0-9]*) ([A-Za-z_0-9]*);$")
 794
 795     line_indicates_result_regex = re.compile("^   union (LDKCResult_[A-Za-z_0-9]*Ptr) contents;$")
 796     line_indicates_vec_regex = re.compile("^   (struct |enum |union )?([A-Za-z_0-9]*) \*data;$")
 797     line_indicates_opaque_regex = re.compile("^   bool is_owned;$")
 798     line_indicates_trait_regex = re.compile("^   (struct |enum |union )?([A-Za-z_0-9]* \*?)\(\*([A-Za-z_0-9]*)\)\((const )?void \*this_arg(.*)\);$")
 799     assert(line_indicates_trait_regex.match("   uintptr_t (*send_data)(void *this_arg, LDKu8slice data, bool resume_read);"))
 800     assert(line_indicates_trait_regex.match("   struct LDKCVec_MessageSendEventZ (*get_and_clear_pending_msg_events)(const void *this_arg);"))
 801     assert(line_indicates_trait_regex.match("   struct LDKCVec_u8Z (*write)(const void *this_arg);"))
 802     line_indicates_trait_clone_regex = re.compile("^   void \(\*cloned\)\(struct ([A-Za-z0-9])* \*NONNULL_PTR new_[A-Za-z0-9]*\);$")
 803     assert(line_indicates_trait_clone_regex.match("   void (*cloned)(struct LDKSign *NONNULL_PTR new_Sign);"))
 804     line_field_var_regex = re.compile("^   struct ([A-Za-z_0-9]*) ([A-Za-z_0-9]*);$")
 805     assert(line_field_var_regex.match("   struct LDKMessageSendEventsProvider MessageSendEventsProvider;"))
 806     assert(line_field_var_regex.match("   struct LDKChannelPublicKeys pubkeys;"))
 807     struct_name_regex = re.compile("^typedef (struct|enum|union) (MUST_USE_STRUCT )?(LDK[A-Za-z_0-9]*) {$")
 808     assert(struct_name_regex.match("typedef struct LDKCVec_u8Z {"))
 809     assert(struct_name_regex.match("typedef enum LDKNetwork {"))
 810
 811     union_enum_items = {}
 812     result_ptr_struct_items = {}
 813     for line in in_h:
 814         if block_comment is not None:
 815             if line.endswith("*/\n"):
 816                 last_block_comment = block_comment.strip("\n")
 817                 block_comment = None
 818             else:
 819                 block_comment = block_comment + line.strip(" /*")
 820         elif cur_block_obj is not None:
 821             cur_block_obj  = cur_block_obj + line
 822             if line.startswith("} "):
 823                 field_lines = []
 824                 struct_name = None
 825                 vec_ty = None
 826                 obj_lines = cur_block_obj.split("\n")
 827                 is_opaque = False
 828                 result_contents = None
 829                 is_unitary_enum = False
 830                 is_union_enum = False
 831                 is_union = False
 832                 is_tuple = False
 833                 trait_fn_lines = []
 834                 field_var_lines = []
 835                 last_struct_block_comment = None
 836
 837                 for idx, struct_line in enumerate(obj_lines):
 838                     if struct_line.strip().startswith("/*"):
 839                         block_comment = struct_line.strip(" /*")
 840                     if block_comment is not None:
 841                         if struct_line.endswith("*/"):
 842                             last_struct_block_comment = block_comment.strip("\n")
 843                             block_comment = None
 844                         else:
 845                             block_comment = block_comment + "\n" + struct_line.strip(" /*")
 846                     else:
 847                         struct_name_match = struct_name_regex.match(struct_line)
 848                         if struct_name_match is not None:
 849                             struct_name = struct_name_match.group(3)
 850                             if struct_name_match.group(1) == "enum":
 851                                 if not struct_name.endswith("_Tag"):
 852                                     is_unitary_enum = True
 853                                 else:
 854                                     is_union_enum = True
 855                             elif struct_name_match.group(1) == "union":
 856                                 is_union = True
 857                         if line_indicates_opaque_regex.match(struct_line):
 858                             is_opaque = True
 859                         result_match = line_indicates_result_regex.match(struct_line)
 860                         if result_match is not None:
 861                             result_contents = result_match.group(1)
 862                         vec_ty_match = line_indicates_vec_regex.match(struct_line)
 863                         if vec_ty_match is not None and struct_name.startswith("LDKCVec_"):
 864                             vec_ty = vec_ty_match.group(2)
 865                         elif struct_name.startswith("LDKC2Tuple_") or struct_name.startswith("LDKC3Tuple_"):
 866                             is_tuple = True
 867                         trait_fn_match = line_indicates_trait_regex.match(struct_line)
 868                         if trait_fn_match is not None:
 869                             trait_fn_lines.append((last_struct_block_comment, trait_fn_match))
 870                         trait_clone_fn_match = line_indicates_trait_clone_regex.match(struct_line)
 871                         if trait_clone_fn_match is not None:
 872                             trait_fn_lines.append((last_struct_block_comment, "cloned"))
 873                         field_var_match = line_field_var_regex.match(struct_line)
 874                         if field_var_match is not None:
 875                             field_var_lines.append(field_var_match)
 876                         field_lines.append((struct_line, last_struct_block_comment))
 877                         last_struct_block_comment = None
 878
 879                 assert(struct_name is not None)
 880                 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))
 881                 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))
 882                 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))
 883                 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))
 884                 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))
 885                 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))
 886                 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))
 887
 888                 if is_opaque:
 889                     opaque_structs.add(struct_name)
 890                     with open(f"{sys.argv[3]}/structs/{struct_name.replace('LDK', '')}{consts.file_ext}", "w") as out_java_struct:
 891                         out_opaque_struct_human = consts.map_opaque_struct(struct_name, last_block_comment)
 892                         last_block_comment = None
 893                         out_java_struct.write(out_opaque_struct_human)
 894                 elif result_contents is not None:
 895                     assert result_contents in result_ptr_struct_items
 896                     res_ty, err_ty = result_ptr_struct_items[result_contents]
 897                     map_result(struct_name, res_ty, err_ty)
 898                 elif struct_name.startswith("LDKCResult_") and struct_name.endswith("ZPtr"):
 899                     for line, _ in field_lines:
 900                         if line.endswith("*result;"):
 901                             res_ty = line[:-8].strip()
 902                         elif line.endswith("*err;"):
 903                             err_ty = line[:-5].strip()
 904                     result_ptr_struct_items[struct_name] = (res_ty, err_ty)
 905                     result_types.add(struct_name[:-3])
 906                 elif is_tuple:
 907                     map_tuple(struct_name, field_lines)
 908                 elif vec_ty is not None:
 909                     ty_info = type_mapping_generator.map_type(vec_ty + " arr_elem", False, None, False, False)
 910                     if len(ty_info.java_fn_ty_arg) == 1: # ie we're a primitive of some form
 911                         out_java.write("\tpublic static native long " + struct_name + "_new(" + ty_info.java_ty + "[] elems);\n")
 912                         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")
 913                         write_c("\t" + struct_name + " *ret = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n")
 914                         write_c("\tret->datalen = " + consts.get_native_arr_len_call[0] + "elems" + consts.get_native_arr_len_call[1] + ";\n")
 915                         write_c("\tif (ret->datalen == 0) {\n")
 916                         write_c("\t\tret->data = NULL;\n")
 917                         write_c("\t} else {\n")
 918                         write_c("\t\tret->data = MALLOC(sizeof(" + vec_ty + ") * ret->datalen, \"" + struct_name + " Data\");\n")
 919                         native_arr_ptr_call = consts.get_native_arr_ptr_call(ty_info.ty_info)
 920                         write_c("\t\t" + ty_info.c_ty + " *java_elems = " + native_arr_ptr_call[0] + "elems" + native_arr_ptr_call[1] + ";\n")
 921                         write_c("\t\tfor (size_t i = 0; i < ret->datalen; i++) {\n")
 922                         if ty_info.arg_conv is not None:
 923                             write_c("\t\t\t" + ty_info.c_ty + " arr_elem = java_elems[i];\n")
 924                             write_c("\t\t\t" + ty_info.arg_conv.replace("\n", "\n\t\t\t") + "\n")
 925                             write_c("\t\t\tret->data[i] = " + ty_info.arg_conv_name + ";\n")
 926                             assert ty_info.arg_conv_cleanup is None
 927                         else:
 928                             write_c("\t\t\tret->data[i] = java_elems[i];\n")
 929                         write_c("\t\t}\n")
 930                         cleanup = consts.release_native_arr_ptr_call(ty_info.ty_info, "elems", "java_elems")
 931                         if cleanup is not None:
 932                             write_c("\t\t" + cleanup + ";\n")
 933                         write_c("\t}\n")
 934                         write_c("\treturn (uint64_t)ret;\n")
 935                         write_c("}\n")
 936
 937                     if ty_info.is_native_primitive:
 938                         clone_fns.add(struct_name.replace("LDK", "") + "_clone")
 939                         write_c("static inline " + struct_name + " " + struct_name.replace("LDK", "") + "_clone(const " + struct_name + " *orig) {\n")
 940                         write_c("\t" + struct_name + " ret = { .data = MALLOC(sizeof(" + ty_info.c_ty + ") * orig->datalen, \"" + struct_name + " clone bytes\"), .datalen = orig->datalen };\n")
 941                         write_c("\tmemcpy(ret.data, orig->data, sizeof(" + ty_info.c_ty + ") * ret.datalen);\n")
 942                         write_c("\treturn ret;\n}\n")
 943                     elif (ty_info.rust_obj.replace("LDK", "") + "_clone") in clone_fns:
 944                         ty_name = "CVec_" + ty_info.rust_obj.replace("LDK", "") + "Z";
 945                         clone_fns.add(ty_name + "_clone")
 946                         write_c("static inline " + struct_name + " " + ty_name + "_clone(const " + struct_name + " *orig) {\n")
 947                         write_c("\t" + struct_name + " ret = { .data = MALLOC(sizeof(" + ty_info.rust_obj + ") * orig->datalen, \"" + struct_name + " clone bytes\"), .datalen = orig->datalen };\n")
 948                         write_c("\tfor (size_t i = 0; i < ret.datalen; i++) {\n")
 949                         write_c("\t\tret.data[i] = " + ty_info.rust_obj.replace("LDK", "") + "_clone(&orig->data[i]);\n")
 950                         write_c("\t}\n\treturn ret;\n}\n")
 951                 elif is_union_enum:
 952                     assert(struct_name.endswith("_Tag"))
 953                     struct_name = struct_name[:-4]
 954                     union_enum_items[struct_name] = {"field_lines": field_lines}
 955                 elif struct_name.endswith("_Body") and struct_name.split("_")[0] in union_enum_items:
 956                     enum_var_name = struct_name.split("_")
 957                     union_enum_items[enum_var_name[0]][enum_var_name[1]] = field_lines
 958                 elif struct_name in union_enum_items:
 959                     tuple_variants = {}
 960                     elem_items = -1
 961                     for line, _ in field_lines:
 962                         if line == "      struct {":
 963                             elem_items = 0
 964                         elif line == "      };":
 965                             elem_items = -1
 966                         elif elem_items > -1:
 967                             line = line.strip()
 968                             if line.startswith("struct "):
 969                                 line = line[7:]
 970                             elif line.startswith("enum "):
 971                                 line = line[5:]
 972                             split = line.split(" ")
 973                             assert len(split) == 2
 974                             tuple_variants[split[1].strip(";")] = split[0]
 975                             elem_items += 1
 976                             if elem_items > 1:
 977                                 # We don't currently support tuple variant with more than one element
 978                                 assert False
 979                     map_complex_enum(struct_name, union_enum_items[struct_name], tuple_variants, last_block_comment)
 980                     last_block_comment = None
 981                 elif is_unitary_enum:
 982                     map_unitary_enum(struct_name, field_lines, last_block_comment)
 983                     last_block_comment = None
 984                 elif len(trait_fn_lines) > 0:
 985                     map_trait(struct_name, field_var_lines, trait_fn_lines, last_block_comment)
 986                 elif struct_name == "LDKTxOut":
 987                     with open(f"{sys.argv[3]}/structs/TxOut{consts.file_ext}", "w") as out_java_struct:
 988                         out_java_struct.write(consts.hu_struct_file_prefix)
 989                         out_java_struct.write("public class TxOut extends CommonBase{\n")
 990                         out_java_struct.write("\t/** The script_pubkey in this output */\n")
 991                         out_java_struct.write("\tpublic final byte[] script_pubkey;\n")
 992                         out_java_struct.write("\t/** The value, in satoshis, of this output */\n")
 993                         out_java_struct.write("\tpublic final long value;\n")
 994                         out_java_struct.write("\n")
 995                         out_java_struct.write("\tTxOut(java.lang.Object _dummy, long ptr) {\n")
 996                         out_java_struct.write("\t\tsuper(ptr);\n")
 997                         out_java_struct.write("\t\tthis.script_pubkey = bindings.TxOut_get_script_pubkey(ptr);\n")
 998                         out_java_struct.write("\t\tthis.value = bindings.TxOut_get_value(ptr);\n")
 999                         out_java_struct.write("\t}\n")
1000                         out_java_struct.write("\tpublic TxOut(long value, byte[] script_pubkey) {\n")
1001                         out_java_struct.write("\t\tsuper(bindings.TxOut_new(script_pubkey, value));\n")
1002                         out_java_struct.write("\t\tthis.script_pubkey = bindings.TxOut_get_script_pubkey(ptr);\n")
1003                         out_java_struct.write("\t\tthis.value = bindings.TxOut_get_value(ptr);\n")
1004                         out_java_struct.write("\t}\n")
1005                         out_java_struct.write("\n")
1006                         out_java_struct.write("\t@Override @SuppressWarnings(\"deprecation\")\n")
1007                         out_java_struct.write("\tprotected void finalize() throws Throwable {\n")
1008                         out_java_struct.write("\t\tsuper.finalize();\n")
1009                         out_java_struct.write("\t\tif (ptr != 0) { bindings.TxOut_free(ptr); }\n")
1010                         out_java_struct.write("\t}\n")
1011                         out_java_struct.write("\n")
1012                         out_java_struct.write("}")
1013                         fn_line = "struct LDKCVec_u8Z TxOut_get_script_pubkey (struct LDKTxOut* thing)"
1014                         write_c(fn_line + " {")
1015                         write_c("\treturn CVec_u8Z_clone(&thing->script_pubkey);")
1016                         write_c("}")
1017                         map_fn(fn_line + "\n", re.compile("(.*) (TxOut_get_script_pubkey) \((.*)\)").match(fn_line), None, None, None)
1018                         fn_line = "uint64_t TxOut_get_value (struct LDKTxOut* thing)"
1019                         write_c(fn_line + " {")
1020                         write_c("\treturn thing->value;")
1021                         write_c("}")
1022                         map_fn(fn_line + "\n", re.compile("(.*) (TxOut_get_value) \((.*)\)").match(fn_line), None, None, None)
1023                 else:
1024                     pass # Everything remaining is a byte[] or some form
1025                 cur_block_obj = None
1026         else:
1027             fn_ptr = fn_ptr_regex.match(line)
1028             fn_ret_arr = fn_ret_arr_regex.match(line)
1029             reg_fn = reg_fn_regex.match(line)
1030             const_val = const_val_regex.match(line)
1031
1032             if line.startswith("#include <"):
1033                 pass
1034             elif line.startswith("/*"):
1035                 if not line.endswith("*/\n"):
1036                     block_comment = line.strip(" /*")
1037             elif line.startswith("typedef enum "):
1038                 cur_block_obj = line
1039             elif line.startswith("typedef struct "):
1040                 cur_block_obj = line
1041             elif line.startswith("typedef union "):
1042                 cur_block_obj = line
1043             elif fn_ptr is not None:
1044                 map_fn(line, fn_ptr, None, None, last_block_comment)
1045                 last_block_comment = None
1046             elif fn_ret_arr is not None:
1047                 map_fn(line, fn_ret_arr, fn_ret_arr.group(4), None, last_block_comment)
1048                 last_block_comment = None
1049             elif reg_fn is not None:
1050                 map_fn(line, reg_fn, None, None, last_block_comment)
1051                 last_block_comment = None
1052             elif const_val_regex is not None:
1053                 # TODO Map const variables
1054                 pass
1055             else:
1056                 assert(line == "\n")
1057
1058     out_java.write(consts.bindings_footer)
1059     for struct_name in opaque_structs:
1060         with open(f"{sys.argv[3]}/structs/{struct_name.replace('LDK', '')}{consts.file_ext}", "a") as out_java_struct:
1061             out_java_struct.write("}\n")
1062     for struct_name in trait_structs:
1063         with open(f"{sys.argv[3]}/structs/{struct_name.replace('LDK', '')}{consts.file_ext}", "a") as out_java_struct:
1064             out_java_struct.write("}\n")
1065     for struct_name in complex_enums:
1066         with open(f"{sys.argv[3]}/structs/{struct_name.replace('LDK', '').replace('COption', 'Option')}{consts.file_ext}", "a") as out_java_struct:
1067             out_java_struct.write("}\n")
1068     for struct_name in result_types:
1069         with open(f"{sys.argv[3]}/structs/{struct_name.replace('LDKCResult', 'Result')}{consts.file_ext}", "a") as out_java_struct:
1070             out_java_struct.write("}\n")
1071     for struct_name in tuple_types:
1072         struct_hu_name = struct_name.replace("LDKC2Tuple", "TwoTuple").replace("LDKC3Tuple", "ThreeTuple")
1073         with open(f"{sys.argv[3]}/structs/{struct_hu_name}{consts.file_ext}", "a") as out_java_struct:
1074             out_java_struct.write("}\n")
1075
1076 with open(f"{sys.argv[4]}/bindings.c.body", "w") as out_c:
1077     out_c.write(consts.c_file_pfx)
1078     out_c.write(consts.init_str())
1079     out_c.write(c_file)
1080 with open(f"{sys.argv[4]}/version.c", "w") as out_c:
1081     out_c.write(consts.c_version_file.replace('<git_version_ldk_garbagecollected>', local_git_version))
1082 with open(f"{sys.argv[3]}/structs/UtilMethods{consts.file_ext}", "a") as util:
1083     util.write(consts.util_fn_sfx)