_ 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, outdir=sys.argv[4])
  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("LDKTwelveBytes"):
 178         fn_arg = "uint8_t (*" + fn_arg[15:] + ")[12]"
 179         assert var_is_arr_regex.match(fn_arg[8:])
 180         rust_obj = "LDKTwelveBytes"
 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") or method_name.startswith("C3Tuple"):
 414             tuple_name = method_name.rsplit("Z", 1)[0][2:] + "Z"
 415             if method_name.startswith("C2Tuple"):
 416                 struct_meth = "Two" + tuple_name
 417                 expected_struct = "LDKC2" + tuple_name
 418             else:
 419                 struct_meth = "Three" + tuple_name
 420                 expected_struct = "LDKC3" + tuple_name
 421             struct_meth_name = method_name[len(tuple_name) + 2:].strip("_")
 422         else:
 423             struct_meth = method_name.split("_")[0]
 424             expected_struct = "LDK" + struct_meth
 425             struct_meth_name = method_name[len(struct_meth) + 1 if len(struct_meth) != 0 else 0:].strip("_")
 426
 427         (params_nullable, ret_nullable) = doc_to_params_ret_nullable(doc_comment)
 428         if ret_nullable:
 429             return_type_info = type_mapping_generator.map_nullable_type(method_return_type.strip() + " ret", True, ret_arr_len, False, force_holds_ref)
 430         else:
 431             return_type_info = type_mapping_generator.map_type(method_return_type.strip() + " ret", True, ret_arr_len, False, force_holds_ref)
 432
 433         if method_name.endswith("_clone") and expected_struct not in unitary_enums:
 434             meth_line = "uint64_t " + expected_struct.replace("LDK", "") + "_clone_ptr(" + expected_struct + " *NONNULL_PTR arg)"
 435             write_c("static inline " + meth_line + " {\n")
 436             write_c("\t" + return_type_info.ret_conv[0].replace("\n", "\n\t"))
 437             write_c(method_name + "(arg)")
 438             write_c(return_type_info.ret_conv[1])
 439             write_c("\n\treturn " + return_type_info.ret_conv_name + ";\n}\n")
 440             map_fn(meth_line + ";\n", re.compile("(uint64_t) ([A-Za-z_0-9]*)\((.*)\)").match(meth_line), None, None, None)
 441
 442         argument_types = []
 443         default_constructor_args = {}
 444         takes_self = False
 445         takes_self_ptr = False
 446         args_known = True
 447
 448         for argument_index, argument in enumerate(method_arguments):
 449             arg_ty = type_mapping_generator.java_c_types(argument, None)
 450             argument_conversion_info = None
 451             if argument_index == 0 and arg_ty.java_hu_ty == struct_meth:
 452                 argument_conversion_info = type_mapping_generator.map_type_with_info(arg_ty, False, None, is_free, True, False)
 453                 takes_self = True
 454                 if argument_conversion_info.ty_info.is_ptr:
 455                     takes_self_ptr = True
 456             elif arg_ty.var_name in params_nullable:
 457                 argument_conversion_info = type_mapping_generator.map_type_with_info(arg_ty, False, None, is_free, True, True)
 458                 if argument_conversion_info.arg_conv is not None and "Warning" in argument_conversion_info.arg_conv:
 459                     arg_ty_info = java_c_types(argument, None)
 460                     print("WARNING: Remapping argument " + arg_ty_info.var_name + " of function " + method_name + " to a reference")
 461                     print("    The argument appears to require a move, or not clonable, and is nullable.")
 462                     print("    Normally for arguments that require a move and are not clonable, we split")
 463                     print("    the argument into the type's constructor's arguments and just use those to")
 464                     print("    construct a new object on the fly.")
 465                     print("    However, because the object is nullable, doing so would mean we can no")
 466                     print("    longer allow the user to pass null, as we now have an argument list instead.")
 467                     print("    Thus, we blindly assume its really an Option<&Type> instead of an Option<Type>.")
 468                     print("    It may or may not actually be a reference, but its the simplest mapping option")
 469                     print("    and also the only use of this code today.")
 470                     arg_ty_info.requires_clone = False
 471                     argument_conversion_info = type_mapping_generator.map_type_with_info(arg_ty_info, False, None, is_free, True, True)
 472                     assert argument_conversion_info.nullable
 473                     assert argument_conversion_info.arg_conv is not None and "Warning" not in argument_conversion_info.arg_conv
 474             else:
 475                 argument_conversion_info = type_mapping_generator.map_type_with_info(arg_ty, False, None, is_free, True, False)
 476
 477             if argument_conversion_info.arg_conv is not None and "Warning" in argument_conversion_info.arg_conv:
 478                 if argument_conversion_info.rust_obj in constructor_fns:
 479                     assert not is_free
 480                     for explode_arg in constructor_fns[argument_conversion_info.rust_obj].split(','):
 481                         explode_arg_conv = type_mapping_generator.map_type(explode_arg, False, None, False, True)
 482                         if explode_arg_conv.c_ty == "void":
 483                             # We actually want to handle this case, but for now its only used in NetGraphMsgHandler::new()
 484                             # which ends up resulting in a redundant constructor - both without arguments for the NetworkGraph.
 485                             args_known = False
 486                             pass
 487                         if not argument_conversion_info.arg_name in default_constructor_args:
 488                             default_constructor_args[argument_conversion_info.arg_name] = []
 489                         default_constructor_args[argument_conversion_info.arg_name].append(explode_arg_conv)
 490             argument_types.append(argument_conversion_info)
 491         if not takes_self and return_type_info.java_hu_ty != struct_meth:
 492             if not return_type_info.java_hu_ty.startswith("Result_" + struct_meth):
 493                 struct_meth_name = method_name
 494                 struct_meth = ""
 495                 expected_struct = ""
 496
 497         out_java.write("\t// " + line)
 498         (out_java_delta, out_c_delta, out_java_struct_delta) = \
 499             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)
 500         out_java.write(out_java_delta)
 501
 502         if is_free:
 503             assert len(argument_types) == 1
 504             assert return_type_info.c_ty == "void"
 505             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")
 506             if argument_types[0].ty_info.passed_as_ptr and not argument_types[0].ty_info.rust_obj in opaque_structs:
 507                 write_c("\tif ((" + argument_types[0].ty_info.var_name + " & 1) != 0) return;\n")
 508
 509             for info in argument_types:
 510                 if info.arg_conv is not None:
 511                     write_c("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
 512             assert c_call_string is None
 513             write_c("\t" + method_name + "(")
 514             if argument_types[0].arg_conv_name is not None:
 515                 write_c(argument_types[0].arg_conv_name)
 516             write_c(");")
 517             for info in argument_types:
 518                 if info.arg_conv_cleanup is not None:
 519                     write_c("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
 520             write_c("\n}\n\n")
 521         else:
 522             write_c(out_c_delta)
 523
 524         out_java_struct = None
 525         if (expected_struct in opaque_structs or expected_struct in trait_structs
 526                 or expected_struct in complex_enums or expected_struct in complex_enums
 527                 or expected_struct in result_types or expected_struct in tuple_types) and not is_free:
 528             out_java_struct = open(f"{sys.argv[3]}/structs/{struct_meth}{consts.file_ext}", "a")
 529             out_java_struct.write(out_java_struct_delta)
 530         elif (not is_free and not method_name.endswith("_clone") and
 531                 not method_name.startswith("TxOut") and
 532                 not method_name.startswith("_") and
 533                 method_name != "check_platform" and method_name != "Result_read" and
 534                 not expected_struct in unitary_enums and
 535                 ((not method_name.startswith("C2Tuple_") and not method_name.startswith("C3Tuple_"))
 536                   or method_name.endswith("_read"))):
 537             out_java_struct = open(f"{sys.argv[3]}/structs/UtilMethods{consts.file_ext}", "a")
 538             for line in out_java_struct_delta.splitlines():
 539                 if "this" not in line:
 540                     out_java_struct.write(line + "\n")
 541                 else:
 542                     out_java_struct.write("\t\t// " + line.strip() + "\n")
 543
 544     def map_unitary_enum(struct_name, field_lines, enum_doc_comment):
 545         assert struct_name.startswith("LDK")
 546         with open(f"{sys.argv[3]}/enums/{struct_name[3:]}{consts.file_ext}", "w") as out_java_enum:
 547             unitary_enums.add(struct_name)
 548             for idx, (struct_line, _) in enumerate(field_lines):
 549                 if idx == 0:
 550                     assert(struct_line == "typedef enum %s {" % struct_name)
 551                 elif idx == len(field_lines) - 3:
 552                     assert(struct_line.endswith("_Sentinel,"))
 553                 elif idx == len(field_lines) - 2:
 554                     assert(struct_line == "} %s;" % struct_name)
 555                 elif idx == len(field_lines) - 1:
 556                     assert(struct_line == "")
 557             assert struct_name.startswith("LDK")
 558             (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)
 559             write_c(c_out)
 560             out_java_enum.write(native_file_out)
 561             out_java.write(native_out)
 562
 563     def map_complex_enum(struct_name, union_enum_items, inline_enum_variants, enum_doc_comment):
 564         java_hu_type = struct_name.replace("LDK", "").replace("COption", "Option")
 565
 566         enum_variants = []
 567         tag_field_lines = union_enum_items["field_lines"]
 568         contains_trait = False
 569         for idx, (struct_line, variant_docs) in enumerate(tag_field_lines):
 570             if idx == 0:
 571                 assert(struct_line == "typedef enum %s_Tag {" % struct_name)
 572             elif idx == len(tag_field_lines) - 3:
 573                 assert(struct_line.endswith("_Sentinel,"))
 574             elif idx == len(tag_field_lines) - 2:
 575                 assert(struct_line == "} %s_Tag;" % struct_name)
 576             elif idx == len(tag_field_lines) - 1:
 577                 assert(struct_line == "")
 578             else:
 579                 variant_name = struct_line.strip(' ,')[len(struct_name) + 1:]
 580                 fields = []
 581                 if "LDK" + variant_name in union_enum_items:
 582                     enum_var_lines = union_enum_items["LDK" + variant_name]
 583                     for idx, (field, field_docs) in enumerate(enum_var_lines):
 584                         if idx != 0 and idx < len(enum_var_lines) - 2 and field.strip() != "":
 585                             field_ty = type_mapping_generator.java_c_types(field.strip(' ;'), None)
 586                             contains_trait |= field_ty.contains_trait
 587                             if field_docs is not None and doc_to_field_nullable(field_docs):
 588                                 field_conv = type_mapping_generator.map_type_with_info(field_ty, False, None, False, True, True)
 589                             else:
 590                                 field_conv = type_mapping_generator.map_type_with_info(field_ty, False, None, False, True, False)
 591                             fields.append((field_conv, field_docs))
 592                     enum_variants.append(ComplexEnumVariantInfo(variant_name, variant_docs, fields, False))
 593                 elif camel_to_snake(variant_name) in inline_enum_variants:
 594                     # TODO: If we ever have a rust enum Variant(Option<Struct>) we need to pipe
 595                     # docs through to there, and then potentially mark the field nullable.
 596                     mapped = type_mapping_generator.map_type(inline_enum_variants[camel_to_snake(variant_name)] + " " + camel_to_snake(variant_name), False, None, False, True)
 597                     contains_trait |= mapped.ty_info.contains_trait
 598                     fields.append((mapped, None))
 599                     enum_variants.append(ComplexEnumVariantInfo(variant_name, variant_docs, fields, True))
 600                 else:
 601                     enum_variants.append(ComplexEnumVariantInfo(variant_name, variant_docs, fields, True))
 602         complex_enums[struct_name] = contains_trait
 603
 604         with open(f"{sys.argv[3]}/structs/{java_hu_type}{consts.file_ext}", "w") as out_java_enum:
 605             (out_java_addendum, out_java_enum_addendum, out_c_addendum) = consts.map_complex_enum(struct_name, enum_variants, camel_to_snake, enum_doc_comment)
 606
 607             out_java_enum.write(out_java_enum_addendum)
 608             out_java.write(out_java_addendum)
 609             write_c(out_c_addendum)
 610
 611     def map_trait(struct_name, field_var_lines, trait_fn_lines, trait_doc_comment):
 612         with open(f"{sys.argv[3]}/structs/{struct_name.replace('LDK', '')}{consts.file_ext}", "w") as out_java_trait:
 613             field_var_convs = []
 614             flattened_field_var_convs = []
 615             for var_line in field_var_lines:
 616                 if var_line.group(1) in trait_structs:
 617                     field_var_convs.append((var_line.group(1), var_line.group(2), trait_structs[var_line.group(1)]))
 618                     flattened_field_var_convs.append((var_line.group(1), var_line.group(2), ))
 619                     flattened_field_var_convs.extend(trait_structs[var_line.group(1)])
 620                 else:
 621                     mapped = type_mapping_generator.map_type(var_line.group(1) + " " + var_line.group(2), False, None, False, False)
 622                     field_var_convs.append(mapped)
 623                     flattened_field_var_convs.append(mapped)
 624             trait_structs[struct_name] = field_var_convs
 625
 626             field_fns = []
 627             for fn_docs, fn_line in trait_fn_lines:
 628                 if fn_line == "cloned":
 629                     ret_ty_info = type_mapping_generator.map_type("void", True, None, False, False)
 630                     field_fns.append(TraitMethInfo("cloned", False, ret_ty_info, [], fn_docs))
 631                 else:
 632                     (nullable_params, ret_nullable) = doc_to_params_ret_nullable(fn_docs)
 633                     if ret_nullable:
 634                         assert False # This isn't yet handled on the Java side
 635                         ret_ty_info.nullable = True
 636                         ret_ty_info = type_mapping_generator.map_nullable_type(fn_line.group(2).strip() + " ret", True, None, False, False)
 637                     else:
 638                         ret_ty_info = type_mapping_generator.map_type(fn_line.group(2).strip() + " ret", True, None, False, False)
 639                     is_const = fn_line.group(4) is not None
 640
 641                     arg_tys = []
 642                     for idx, arg in enumerate(fn_line.group(5).split(',')):
 643                         if arg == "":
 644                             continue
 645                         arg_ty_info = type_mapping_generator.java_c_types(arg, None)
 646                         if arg_ty_info.var_name in nullable_params:
 647                             # Types that are actually null instead of all-0s aren't yet handled on the Java side:
 648                             arg_conv_info = type_mapping_generator.map_type_with_info(arg_ty_info, True, None, False, False, True)
 649                         else:
 650                             arg_conv_info = type_mapping_generator.map_type_with_info(arg_ty_info, True, None, False, False, False)
 651                         arg_tys.append(arg_conv_info)
 652                     field_fns.append(TraitMethInfo(fn_line.group(3), is_const, ret_ty_info, arg_tys, fn_docs))
 653
 654             (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)
 655             write_c(out_c_addendum)
 656             out_java_trait.write(out_java_trait_addendum)
 657             out_java.write(out_java_addendum)
 658
 659         for fn_docs, fn_line in trait_fn_lines:
 660             if fn_line == "cloned":
 661                 continue
 662             # For now, just disable enabling the _call_log - we don't know how to inverse-map String
 663             is_log = fn_line.group(3) == "log" and struct_name == "LDKLogger"
 664             if fn_line.group(3) != "free" and fn_line.group(3) != "eq" and not is_log:
 665                 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"
 666                 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)
 667         for idx, var_line in enumerate(field_var_lines):
 668             if var_line.group(1) not in trait_structs:
 669                 write_c(var_line.group(1) + " " + struct_name + "_set_get_" + var_line.group(2) + "(" + struct_name + "* this_arg) {\n")
 670                 write_c("\tif (this_arg->set_" + var_line.group(2) + " != NULL)\n")
 671                 write_c("\t\tthis_arg->set_" + var_line.group(2) + "(this_arg);\n")
 672                 write_c("\treturn this_arg->" + var_line.group(2) + ";\n")
 673                 write_c("}\n")
 674                 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"
 675                 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)
 676
 677     def map_result(struct_name, res_ty, err_ty):
 678         result_types.add(struct_name)
 679         human_ty = struct_name.replace("LDKCResult", "Result")
 680         res_map = type_mapping_generator.map_type(res_ty + " res", True, None, False, True)
 681         err_map = type_mapping_generator.map_type(err_ty + " err", True, None, False, True)
 682         java_hu_struct = consts.map_result(struct_name, res_map, err_map)
 683         create_getter(struct_name, res_ty, "ok", ("*", "->contents.result"), ("", "->result_ok"))
 684         create_getter(struct_name, err_ty, "err", ("*", "->contents.err"), ("!", "->result_ok"))
 685         with open(f"{sys.argv[3]}/structs/{human_ty}{consts.file_ext}", "w") as out_java_struct:
 686             out_java_struct.write(java_hu_struct)
 687
 688     def create_getter(struct_name, field_decl, field_name, accessor, check_sfx):
 689         field_ty = java_c_types(field_decl + " " + field_name, None)
 690         ptr_fn_defn = field_decl + " *" + struct_name.replace("LDK", "") + "_get_" + field_name + "(" + struct_name + " *NONNULL_PTR owner)"
 691         owned_fn_defn = field_decl + " " + struct_name.replace("LDK", "") + "_get_" + field_name + "(" + struct_name + " *NONNULL_PTR owner)"
 692
 693         holds_ref = False
 694         if field_ty.rust_obj is not None and field_ty.rust_obj.replace("LDK", "") + "_clone" in clone_fns:
 695             fn_defn = owned_fn_defn
 696             write_c("static inline " + fn_defn + "{\n")
 697             if check_sfx is not None:
 698                 write_c("CHECK(" + check_sfx[0] + "owner" + check_sfx[1] + ");\n")
 699             write_c("\treturn " + field_ty.rust_obj.replace("LDK", "") + "_clone(&" + accessor[0] + "owner" + accessor[1] + ");\n")
 700         elif field_ty.arr_len is not None or field_ty.is_native_primitive or field_ty.rust_obj in unitary_enums:
 701             fn_defn = owned_fn_defn
 702             write_c("static inline " + fn_defn + "{\n")
 703             if check_sfx is not None:
 704                 write_c("CHECK(" + check_sfx[0] + "owner" + check_sfx[1] + ");\n")
 705             write_c("\treturn " + accessor[0] + "owner" + accessor[1] + ";\n")
 706             holds_ref = True
 707         else:
 708             fn_defn = ptr_fn_defn
 709             write_c("static inline " + fn_defn + "{\n")
 710             if check_sfx is not None:
 711                 write_c("CHECK(" + check_sfx[0] + "owner" + check_sfx[1] + ");\n")
 712             write_c("\treturn &" + accessor[0] + "owner" + accessor[1] + ";\n")
 713             holds_ref = True
 714         write_c("}\n")
 715         dummy_line = fn_defn + ";\n"
 716         map_fn_with_ref_option(dummy_line, reg_fn_regex.match(dummy_line), None, None, "", holds_ref)
 717
 718     def map_tuple(struct_name, field_lines):
 719         human_ty = struct_name.replace("LDKC2Tuple", "TwoTuple").replace("LDKC3Tuple", "ThreeTuple")
 720         with open(f"{sys.argv[3]}/structs/{human_ty}{consts.file_ext}", "w") as out_java_struct:
 721             out_java_struct.write(consts.map_tuple(struct_name))
 722             ty_list = []
 723             for idx, (line, _) in enumerate(field_lines):
 724                 if idx != 0 and idx < len(field_lines) - 2:
 725                     ty_list.append(java_c_types(line.strip(';'), None))
 726             tuple_types[struct_name] = (ty_list, struct_name)
 727
 728         # Map virtual getter functions
 729         for idx, (line, _) in enumerate(field_lines):
 730             if idx != 0 and idx < len(field_lines) - 2:
 731                 field_name = chr(ord('a') + idx - 1)
 732                 assert line.endswith(" " + field_name + ";")
 733                 create_getter(struct_name, line[:-3].strip(), field_name, ("", "->" + field_name), None)
 734
 735     out_java.write(consts.bindings_header)
 736     with open(f"{sys.argv[2]}/version{consts.file_ext}", "w") as out_java_version:
 737         out_java_version.write(consts.bindings_version_file.replace('<git_version_ldk_garbagecollected>', local_git_version))
 738
 739     with open(f"{sys.argv[3]}/structs/CommonBase{consts.file_ext}", "w") as out_java_struct:
 740         out_java_struct.write(consts.common_base)
 741
 742     block_comment = None
 743     last_block_comment = None
 744     cur_block_obj = None
 745
 746     const_val_regex = re.compile("^extern const ([A-Za-z_0-9]*) ([A-Za-z_0-9]*);$")
 747
 748     line_indicates_result_regex = re.compile("^   union (LDKCResult_[A-Za-z_0-9]*Ptr) contents;$")
 749     line_indicates_vec_regex = re.compile("^   (struct |enum |union )?([A-Za-z_0-9]*) \*data;$")
 750     line_indicates_opaque_regex = re.compile("^   bool is_owned;$")
 751     line_indicates_trait_regex = re.compile("^   (struct |enum |union )?([A-Za-z_0-9]* \*?)\(\*([A-Za-z_0-9]*)\)\((const )?void \*this_arg(.*)\);$")
 752     assert(line_indicates_trait_regex.match("   uintptr_t (*send_data)(void *this_arg, LDKu8slice data, bool resume_read);"))
 753     assert(line_indicates_trait_regex.match("   struct LDKCVec_MessageSendEventZ (*get_and_clear_pending_msg_events)(const void *this_arg);"))
 754     assert(line_indicates_trait_regex.match("   struct LDKCVec_u8Z (*write)(const void *this_arg);"))
 755     line_indicates_trait_clone_regex = re.compile("^   void \(\*cloned\)\(struct ([A-Za-z0-9])* \*NONNULL_PTR new_[A-Za-z0-9]*\);$")
 756     assert(line_indicates_trait_clone_regex.match("   void (*cloned)(struct LDKSign *NONNULL_PTR new_Sign);"))
 757     line_field_var_regex = re.compile("^   struct ([A-Za-z_0-9]*) ([A-Za-z_0-9]*);$")
 758     assert(line_field_var_regex.match("   struct LDKMessageSendEventsProvider MessageSendEventsProvider;"))
 759     assert(line_field_var_regex.match("   struct LDKChannelPublicKeys pubkeys;"))
 760     struct_name_regex = re.compile("^typedef (struct|enum|union) (MUST_USE_STRUCT )?(LDK[A-Za-z_0-9]*) {$")
 761     assert(struct_name_regex.match("typedef struct LDKCVec_u8Z {"))
 762     assert(struct_name_regex.match("typedef enum LDKNetwork {"))
 763
 764     union_enum_items = {}
 765     result_ptr_struct_items = {}
 766     for line in in_h:
 767         if block_comment is not None:
 768             if line.endswith("*/\n"):
 769                 last_block_comment = block_comment.strip("\n")
 770                 block_comment = None
 771             else:
 772                 block_comment = block_comment + line.strip(" /*")
 773         elif cur_block_obj is not None:
 774             cur_block_obj  = cur_block_obj + line
 775             if line.startswith("} "):
 776                 field_lines = []
 777                 struct_name = None
 778                 vec_ty = None
 779                 obj_lines = cur_block_obj.split("\n")
 780                 is_opaque = False
 781                 result_contents = None
 782                 is_unitary_enum = False
 783                 is_union_enum = False
 784                 is_union = False
 785                 is_tuple = False
 786                 trait_fn_lines = []
 787                 field_var_lines = []
 788                 last_struct_block_comment = None
 789
 790                 for idx, struct_line in enumerate(obj_lines):
 791                     if struct_line.strip().startswith("/*"):
 792                         block_comment = struct_line.strip(" /*")
 793                     if block_comment is not None:
 794                         if struct_line.endswith("*/"):
 795                             last_struct_block_comment = block_comment.strip("\n")
 796                             block_comment = None
 797                         else:
 798                             block_comment = block_comment + "\n" + struct_line.strip(" /*").replace("…", "...")
 799                     else:
 800                         struct_name_match = struct_name_regex.match(struct_line)
 801                         if struct_name_match is not None:
 802                             struct_name = struct_name_match.group(3)
 803                             if struct_name_match.group(1) == "enum":
 804                                 if not struct_name.endswith("_Tag"):
 805                                     is_unitary_enum = True
 806                                 else:
 807                                     is_union_enum = True
 808                             elif struct_name_match.group(1) == "union":
 809                                 is_union = True
 810                         if line_indicates_opaque_regex.match(struct_line):
 811                             is_opaque = True
 812                         result_match = line_indicates_result_regex.match(struct_line)
 813                         if result_match is not None:
 814                             result_contents = result_match.group(1)
 815                         vec_ty_match = line_indicates_vec_regex.match(struct_line)
 816                         if vec_ty_match is not None and struct_name.startswith("LDKCVec_"):
 817                             vec_ty = vec_ty_match.group(2)
 818                         elif struct_name.startswith("LDKC2Tuple_") or struct_name.startswith("LDKC3Tuple_"):
 819                             is_tuple = True
 820                         trait_fn_match = line_indicates_trait_regex.match(struct_line)
 821                         if trait_fn_match is not None:
 822                             trait_fn_lines.append((last_struct_block_comment, trait_fn_match))
 823                         trait_clone_fn_match = line_indicates_trait_clone_regex.match(struct_line)
 824                         if trait_clone_fn_match is not None:
 825                             trait_fn_lines.append((last_struct_block_comment, "cloned"))
 826                         field_var_match = line_field_var_regex.match(struct_line)
 827                         if field_var_match is not None:
 828                             field_var_lines.append(field_var_match)
 829                         field_lines.append((struct_line, last_struct_block_comment))
 830                         last_struct_block_comment = None
 831
 832                 assert(struct_name is not None)
 833                 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))
 834                 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))
 835                 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))
 836                 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))
 837                 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))
 838                 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))
 839                 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))
 840
 841                 if is_opaque:
 842                     opaque_structs.add(struct_name)
 843                     with open(f"{sys.argv[3]}/structs/{struct_name.replace('LDK', '')}{consts.file_ext}", "w") as out_java_struct:
 844                         out_opaque_struct_human = consts.map_opaque_struct(struct_name, last_block_comment)
 845                         last_block_comment = None
 846                         out_java_struct.write(out_opaque_struct_human)
 847                 elif result_contents is not None:
 848                     assert result_contents in result_ptr_struct_items
 849                     res_ty, err_ty = result_ptr_struct_items[result_contents]
 850                     map_result(struct_name, res_ty, err_ty)
 851                 elif struct_name.startswith("LDKCResult_") and struct_name.endswith("ZPtr"):
 852                     for line, _ in field_lines:
 853                         if line.endswith("*result;"):
 854                             res_ty = line[:-8].strip()
 855                         elif line.endswith("*err;"):
 856                             err_ty = line[:-5].strip()
 857                     result_ptr_struct_items[struct_name] = (res_ty, err_ty)
 858                     result_types.add(struct_name[:-3])
 859                 elif is_tuple:
 860                     map_tuple(struct_name, field_lines)
 861                 elif vec_ty is not None:
 862                     ty_info = type_mapping_generator.map_type(vec_ty + " arr_elem", False, None, False, False)
 863                     if ty_info.is_native_primitive:
 864                         clone_fns.add(struct_name.replace("LDK", "") + "_clone")
 865                         write_c("static inline " + struct_name + " " + struct_name.replace("LDK", "") + "_clone(const " + struct_name + " *orig) {\n")
 866                         write_c("\t" + struct_name + " ret = { .data = MALLOC(sizeof(" + ty_info.c_ty + ") * orig->datalen, \"" + struct_name + " clone bytes\"), .datalen = orig->datalen };\n")
 867                         write_c("\tmemcpy(ret.data, orig->data, sizeof(" + ty_info.c_ty + ") * ret.datalen);\n")
 868                         write_c("\treturn ret;\n}\n")
 869                     elif (ty_info.rust_obj.replace("LDK", "") + "_clone") in clone_fns:
 870                         ty_name = "CVec_" + ty_info.rust_obj.replace("LDK", "") + "Z";
 871                         clone_fns.add(ty_name + "_clone")
 872                         write_c("static inline " + struct_name + " " + ty_name + "_clone(const " + struct_name + " *orig) {\n")
 873                         write_c("\t" + struct_name + " ret = { .data = MALLOC(sizeof(" + ty_info.rust_obj + ") * orig->datalen, \"" + struct_name + " clone bytes\"), .datalen = orig->datalen };\n")
 874                         write_c("\tfor (size_t i = 0; i < ret.datalen; i++) {\n")
 875                         write_c("\t\tret.data[i] = " + ty_info.rust_obj.replace("LDK", "") + "_clone(&orig->data[i]);\n")
 876                         write_c("\t}\n\treturn ret;\n}\n")
 877                 elif is_union_enum:
 878                     assert(struct_name.endswith("_Tag"))
 879                     struct_name = struct_name[:-4]
 880                     union_enum_items[struct_name] = {"field_lines": field_lines}
 881                 elif struct_name.endswith("_Body") and struct_name.split("_")[0] in union_enum_items:
 882                     enum_var_name = struct_name.split("_")
 883                     union_enum_items[enum_var_name[0]][enum_var_name[1]] = field_lines
 884                 elif struct_name in union_enum_items:
 885                     tuple_variants = {}
 886                     elem_items = -1
 887                     for line, _ in field_lines:
 888                         if line == "      struct {":
 889                             elem_items = 0
 890                         elif line == "      };":
 891                             elem_items = -1
 892                         elif elem_items > -1:
 893                             line = line.strip()
 894                             if line.startswith("struct "):
 895                                 line = line[7:]
 896                             elif line.startswith("enum "):
 897                                 line = line[5:]
 898                             split = line.split(" ")
 899                             assert len(split) == 2
 900                             tuple_variants[split[1].strip(";")] = split[0]
 901                             elem_items += 1
 902                             if elem_items > 1:
 903                                 # We don't currently support tuple variant with more than one element
 904                                 assert False
 905                     map_complex_enum(struct_name, union_enum_items[struct_name], tuple_variants, last_block_comment)
 906                     last_block_comment = None
 907                 elif is_unitary_enum:
 908                     map_unitary_enum(struct_name, field_lines, last_block_comment)
 909                     last_block_comment = None
 910                 elif len(trait_fn_lines) > 0:
 911                     map_trait(struct_name, field_var_lines, trait_fn_lines, last_block_comment)
 912                 elif struct_name == "LDKTxOut":
 913                     with open(f"{sys.argv[3]}/structs/TxOut{consts.file_ext}", "w") as out_java_struct:
 914                         out_java_struct.write(consts.hu_struct_file_prefix)
 915                         out_java_struct.write(consts.txout_defn)
 916                         fn_line = "struct LDKCVec_u8Z TxOut_get_script_pubkey (struct LDKTxOut* thing)"
 917                         write_c(fn_line + " {")
 918                         write_c("\treturn CVec_u8Z_clone(&thing->script_pubkey);")
 919                         write_c("}")
 920                         map_fn(fn_line + "\n", re.compile("(.*) (TxOut_get_script_pubkey) \((.*)\)").match(fn_line), None, None, None)
 921                         fn_line = "uint64_t TxOut_get_value (struct LDKTxOut* thing)"
 922                         write_c(fn_line + " {")
 923                         write_c("\treturn thing->value;")
 924                         write_c("}")
 925                         map_fn(fn_line + "\n", re.compile("(.*) (TxOut_get_value) \((.*)\)").match(fn_line), None, None, None)
 926                 else:
 927                     pass # Everything remaining is a byte[] or some form
 928                 cur_block_obj = None
 929         else:
 930             fn_ptr = fn_ptr_regex.match(line)
 931             fn_ret_arr = fn_ret_arr_regex.match(line)
 932             reg_fn = reg_fn_regex.match(line)
 933             const_val = const_val_regex.match(line)
 934
 935             if line.startswith("#include <"):
 936                 pass
 937             elif line.startswith("/*"):
 938                 if not line.endswith("*/\n"):
 939                     block_comment = line.strip(" /*")
 940             elif line.startswith("typedef enum "):
 941                 cur_block_obj = line
 942             elif line.startswith("typedef struct "):
 943                 cur_block_obj = line
 944             elif line.startswith("typedef union "):
 945                 cur_block_obj = line
 946             elif fn_ptr is not None:
 947                 map_fn(line, fn_ptr, None, None, last_block_comment)
 948                 last_block_comment = None
 949             elif fn_ret_arr is not None:
 950                 map_fn(line, fn_ret_arr, fn_ret_arr.group(4), None, last_block_comment)
 951                 last_block_comment = None
 952             elif reg_fn is not None:
 953                 map_fn(line, reg_fn, None, None, last_block_comment)
 954                 last_block_comment = None
 955             elif const_val_regex is not None:
 956                 # TODO Map const variables
 957                 pass
 958             else:
 959                 assert(line == "\n")
 960
 961     out_java.write(consts.bindings_footer)
 962     for struct_name in opaque_structs:
 963         with open(f"{sys.argv[3]}/structs/{struct_name.replace('LDK', '')}{consts.file_ext}", "a") as out_java_struct:
 964             out_java_struct.write("}\n")
 965     for struct_name in trait_structs:
 966         with open(f"{sys.argv[3]}/structs/{struct_name.replace('LDK', '')}{consts.file_ext}", "a") as out_java_struct:
 967             out_java_struct.write("}\n")
 968     for struct_name in complex_enums:
 969         with open(f"{sys.argv[3]}/structs/{struct_name.replace('LDK', '').replace('COption', 'Option')}{consts.file_ext}", "a") as out_java_struct:
 970             out_java_struct.write("}\n")
 971     for struct_name in result_types:
 972         with open(f"{sys.argv[3]}/structs/{struct_name.replace('LDKCResult', 'Result')}{consts.file_ext}", "a") as out_java_struct:
 973             out_java_struct.write("}\n")
 974     for struct_name in tuple_types:
 975         struct_hu_name = struct_name.replace("LDKC2Tuple", "TwoTuple").replace("LDKC3Tuple", "ThreeTuple")
 976         with open(f"{sys.argv[3]}/structs/{struct_hu_name}{consts.file_ext}", "a") as out_java_struct:
 977             out_java_struct.write("}\n")
 978
 979 with open(f"{sys.argv[4]}/bindings.c.body", "w") as out_c:
 980     out_c.write(consts.c_file_pfx)
 981     out_c.write(consts.init_str())
 982     out_c.write(c_file)
 983 with open(f"{sys.argv[4]}/version.c", "w") as out_c:
 984     out_c.write(consts.c_version_file.replace('<git_version_ldk_garbagecollected>', local_git_version))
 985 with open(f"{sys.argv[3]}/structs/UtilMethods{consts.file_ext}", "a") as util:
 986     util.write(consts.util_fn_sfx)
 987 consts.cleanup()