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

   1 #!/usr/bin/env python3
   2 import sys, re
   3
   4 if len(sys.argv) != 6:
   5     print("USAGE: /path/to/lightning.h /path/to/bindings/output.java /path/to/bindings/ /path/to/bindings/output.c debug")
   6     print("debug should be true or false and indicates whether to track allocations and ensure we don't leak")
   7     sys.exit(1)
   8
   9 hu_struct_file_prefix = """package org.ldk.structs;
  10
  11 import org.ldk.impl.bindings;
  12 import org.ldk.enums.*;
  13 import org.ldk.util.*;
  14 import java.util.Arrays;
  15
  16 @SuppressWarnings("unchecked") // We correctly assign various generic arrays
  17 """
  18
  19 class TypeInfo:
  20     def __init__(self, is_native_primitive, rust_obj, java_ty, java_fn_ty_arg, java_hu_ty, c_ty, passed_as_ptr, is_ptr, var_name, arr_len, arr_access, subty=None):
  21         self.is_native_primitive = is_native_primitive
  22         self.rust_obj = rust_obj
  23         self.java_ty = java_ty
  24         self.java_hu_ty = java_hu_ty
  25         self.java_fn_ty_arg = java_fn_ty_arg
  26         self.c_ty = c_ty
  27         self.passed_as_ptr = passed_as_ptr
  28         self.is_ptr = is_ptr
  29         self.var_name = var_name
  30         self.arr_len = arr_len
  31         self.arr_access = arr_access
  32         self.subty = subty
  33         self.pass_by_ref = is_ptr
  34
  35 class ConvInfo:
  36     def __init__(self, ty_info, arg_name, arg_conv, arg_conv_name, arg_conv_cleanup, ret_conv, ret_conv_name, to_hu_conv, to_hu_conv_name, from_hu_conv):
  37         assert(ty_info.c_ty is not None)
  38         assert(ty_info.java_ty is not None)
  39         assert(arg_name is not None)
  40         self.passed_as_ptr = ty_info.passed_as_ptr
  41         self.rust_obj = ty_info.rust_obj
  42         self.c_ty = ty_info.c_ty
  43         self.java_ty = ty_info.java_ty
  44         self.java_hu_ty = ty_info.java_hu_ty
  45         self.java_fn_ty_arg = ty_info.java_fn_ty_arg
  46         self.arg_name = arg_name
  47         self.arg_conv = arg_conv
  48         self.arg_conv_name = arg_conv_name
  49         self.arg_conv_cleanup = arg_conv_cleanup
  50         self.ret_conv = ret_conv
  51         self.ret_conv_name = ret_conv_name
  52         self.to_hu_conv = to_hu_conv
  53         self.to_hu_conv_name = to_hu_conv_name
  54         self.from_hu_conv = from_hu_conv
  55
  56     def print_ty(self):
  57         out_c.write(self.c_ty)
  58         out_java.write(self.java_ty)
  59
  60     def print_name(self):
  61         if self.arg_name != "":
  62             out_java.write(" " + self.arg_name)
  63             out_c.write(" " + self.arg_name)
  64         else:
  65             out_java.write(" arg")
  66             out_c.write(" arg")
  67
  68 def camel_to_snake(s):
  69     # Convert camel case to snake case, in a way that appears to match cbindgen
  70     con = "_"
  71     ret = ""
  72     lastchar = ""
  73     lastund = False
  74     for char in s:
  75         if lastchar.isupper():
  76             if not char.isupper() and not lastund:
  77                 ret = ret + "_"
  78                 lastund = True
  79             else:
  80                 lastund = False
  81             ret = ret + lastchar.lower()
  82         else:
  83             ret = ret + lastchar
  84             if char.isupper() and not lastund:
  85                 ret = ret + "_"
  86                 lastund = True
  87             else:
  88                 lastund = False
  89         lastchar = char
  90         if char.isnumeric():
  91             lastund = True
  92     return (ret + lastchar.lower()).strip("_")
  93
  94 unitary_enums = set()
  95 complex_enums = set()
  96 opaque_structs = set()
  97 trait_structs = set()
  98 tuple_types = {}
  99
 100 var_is_arr_regex = re.compile("\(\*([A-za-z0-9_]*)\)\[([a-z0-9]*)\]")
 101 var_ty_regex = re.compile("([A-za-z_0-9]*)(.*)")
 102 java_c_types_none_allowed = True # Unset when we do the real pass that populates the above sets
 103 def java_c_types(fn_arg, ret_arr_len):
 104     fn_arg = fn_arg.strip()
 105     if fn_arg.startswith("MUST_USE_RES "):
 106         fn_arg = fn_arg[13:]
 107     is_const = False
 108     if fn_arg.startswith("const "):
 109         fn_arg = fn_arg[6:]
 110         is_const = True
 111
 112     is_ptr = False
 113     take_by_ptr = False
 114     rust_obj = None
 115     arr_access = None
 116     java_hu_ty = None
 117     if fn_arg.startswith("LDKThirtyTwoBytes"):
 118         fn_arg = "uint8_t (*" + fn_arg[18:] + ")[32]"
 119         assert var_is_arr_regex.match(fn_arg[8:])
 120         rust_obj = "LDKThirtyTwoBytes"
 121         arr_access = "data"
 122     elif fn_arg.startswith("LDKPublicKey"):
 123         fn_arg = "uint8_t (*" + fn_arg[13:] + ")[33]"
 124         assert var_is_arr_regex.match(fn_arg[8:])
 125         rust_obj = "LDKPublicKey"
 126         arr_access = "compressed_form"
 127     elif fn_arg.startswith("LDKSecretKey"):
 128         fn_arg = "uint8_t (*" + fn_arg[13:] + ")[32]"
 129         assert var_is_arr_regex.match(fn_arg[8:])
 130         rust_obj = "LDKSecretKey"
 131         arr_access = "bytes"
 132     elif fn_arg.startswith("LDKSignature"):
 133         fn_arg = "uint8_t (*" + fn_arg[13:] + ")[64]"
 134         assert var_is_arr_regex.match(fn_arg[8:])
 135         rust_obj = "LDKSignature"
 136         arr_access = "compact_form"
 137     elif fn_arg.startswith("LDKThreeBytes"):
 138         fn_arg = "uint8_t (*" + fn_arg[14:] + ")[3]"
 139         assert var_is_arr_regex.match(fn_arg[8:])
 140         rust_obj = "LDKThreeBytes"
 141         arr_access = "data"
 142     elif fn_arg.startswith("LDKFourBytes"):
 143         fn_arg = "uint8_t (*" + fn_arg[13:] + ")[4]"
 144         assert var_is_arr_regex.match(fn_arg[8:])
 145         rust_obj = "LDKFourBytes"
 146         arr_access = "data"
 147     elif fn_arg.startswith("LDKSixteenBytes"):
 148         fn_arg = "uint8_t (*" + fn_arg[16:] + ")[16]"
 149         assert var_is_arr_regex.match(fn_arg[8:])
 150         rust_obj = "LDKSixteenBytes"
 151         arr_access = "data"
 152     elif fn_arg.startswith("LDKTenBytes"):
 153         fn_arg = "uint8_t (*" + fn_arg[12:] + ")[10]"
 154         assert var_is_arr_regex.match(fn_arg[8:])
 155         rust_obj = "LDKTenBytes"
 156         arr_access = "data"
 157     elif fn_arg.startswith("LDKu8slice"):
 158         fn_arg = "uint8_t (*" + fn_arg[11:] + ")[datalen]"
 159         assert var_is_arr_regex.match(fn_arg[8:])
 160         rust_obj = "LDKu8slice"
 161         arr_access = "data"
 162     elif fn_arg.startswith("LDKCVecTempl_u8") or fn_arg.startswith("LDKCVec_u8Z"):
 163         if fn_arg.startswith("LDKCVecTempl_u8"):
 164             fn_arg = "uint8_t (*" + fn_arg[16:] + ")[datalen]"
 165             rust_obj = "LDKCVecTempl_u8"
 166             assert var_is_arr_regex.match(fn_arg[8:])
 167         else:
 168             fn_arg = "uint8_t (*" + fn_arg[12:] + ")[datalen]"
 169             rust_obj = "LDKCVec_u8Z"
 170             assert var_is_arr_regex.match(fn_arg[8:])
 171         arr_access = "data"
 172     elif fn_arg.startswith("LDKCVecTempl_") or fn_arg.startswith("LDKCVec_"):
 173         is_ptr = False
 174         if "*" in fn_arg:
 175             fn_arg = fn_arg.replace("*", "")
 176             is_ptr = True
 177
 178         if fn_arg.startswith("LDKCVec_"):
 179             tyn = fn_arg[8:].split(" ")
 180             assert tyn[0].endswith("Z")
 181             if tyn[0] == "u64Z":
 182                 new_arg = "uint64_t"
 183             else:
 184                 new_arg = "LDK" + tyn[0][:-1]
 185             for a in tyn[1:]:
 186                 new_arg = new_arg + " " + a
 187             res = java_c_types(new_arg, ret_arr_len)
 188         else:
 189             res = java_c_types("LDK" + fn_arg[13:], ret_arr_len)
 190         if res is None:
 191             assert java_c_types_none_allowed
 192             return None
 193         if is_ptr:
 194             res.pass_by_ref = True
 195         if res.is_native_primitive or res.passed_as_ptr:
 196             return TypeInfo(rust_obj=fn_arg.split(" ")[0], java_ty=res.java_ty + "[]", java_hu_ty=res.java_hu_ty + "[]",
 197                 java_fn_ty_arg="[" + res.java_fn_ty_arg, c_ty=res.c_ty + "Array", passed_as_ptr=False, is_ptr=is_ptr,
 198                 var_name=res.var_name, arr_len="datalen", arr_access="data", subty=res, is_native_primitive=False)
 199         else:
 200             return TypeInfo(rust_obj=fn_arg.split(" ")[0], java_ty=res.java_ty + "[]", java_hu_ty=res.java_hu_ty + "[]",
 201                 java_fn_ty_arg="[" + res.java_fn_ty_arg, c_ty="jobjectArray", passed_as_ptr=False, is_ptr=is_ptr,
 202                 var_name=res.var_name, arr_len="datalen", arr_access="data", subty=res, is_native_primitive=False)
 203
 204     is_primitive = False
 205     arr_len = None
 206     if fn_arg.startswith("void"):
 207         java_ty = "void"
 208         c_ty = "void"
 209         fn_ty_arg = "V"
 210         fn_arg = fn_arg[4:].strip()
 211         is_primitive = True
 212     elif fn_arg.startswith("bool"):
 213         java_ty = "boolean"
 214         c_ty = "jboolean"
 215         fn_ty_arg = "Z"
 216         fn_arg = fn_arg[4:].strip()
 217         is_primitive = True
 218     elif fn_arg.startswith("uint8_t"):
 219         java_ty = "byte"
 220         c_ty = "jbyte"
 221         fn_ty_arg = "B"
 222         fn_arg = fn_arg[7:].strip()
 223         is_primitive = True
 224     elif fn_arg.startswith("uint16_t"):
 225         java_ty = "short"
 226         c_ty = "jshort"
 227         fn_ty_arg = "S"
 228         fn_arg = fn_arg[8:].strip()
 229         is_primitive = True
 230     elif fn_arg.startswith("uint32_t"):
 231         java_ty = "int"
 232         c_ty = "jint"
 233         fn_ty_arg = "I"
 234         fn_arg = fn_arg[8:].strip()
 235         is_primitive = True
 236     elif fn_arg.startswith("uint64_t") or fn_arg.startswith("uintptr_t"):
 237         java_ty = "long"
 238         c_ty = "jlong"
 239         fn_ty_arg = "J"
 240         if fn_arg.startswith("uint64_t"):
 241             fn_arg = fn_arg[8:].strip()
 242         else:
 243             fn_arg = fn_arg[9:].strip()
 244         is_primitive = True
 245     elif is_const and fn_arg.startswith("char *"):
 246         java_ty = "String"
 247         c_ty = "const char*"
 248         fn_ty_arg = "Ljava/lang/String;"
 249         fn_arg = fn_arg[6:].strip()
 250     elif fn_arg.startswith("LDKStr"):
 251         java_ty = "String"
 252         c_ty = "jstring"
 253         fn_ty_arg = "Ljava/lang/String;"
 254         fn_arg = fn_arg[6:].strip()
 255         arr_access = "chars"
 256         arr_len = "len"
 257     else:
 258         ma = var_ty_regex.match(fn_arg)
 259         if ma.group(1).strip() in unitary_enums:
 260             java_ty = ma.group(1).strip()
 261             c_ty = "jclass"
 262             fn_ty_arg = "Lorg/ldk/enums/" + ma.group(1).strip() + ";"
 263             fn_arg = ma.group(2).strip()
 264             rust_obj = ma.group(1).strip()
 265             take_by_ptr = True
 266         elif ma.group(1).strip().startswith("LDKC2Tuple"):
 267             java_ty = "long"
 268             java_hu_ty = "TwoTuple<"
 269             if not ma.group(1).strip() in tuple_types:
 270                 assert java_c_types_none_allowed
 271                 return None
 272             for idx, ty_info in enumerate(tuple_types[ma.group(1).strip()][0]):
 273                 if idx != 0:
 274                     java_hu_ty = java_hu_ty + ", "
 275                 if ty_info.is_native_primitive:
 276                     java_hu_ty = java_hu_ty + ty_info.java_hu_ty.title() # If we're a primitive, capitalize the first letter
 277                 else:
 278                     java_hu_ty = java_hu_ty + ty_info.java_hu_ty
 279             java_hu_ty = java_hu_ty + ">"
 280             c_ty = "jlong"
 281             fn_ty_arg = "J"
 282             fn_arg = ma.group(2).strip()
 283             rust_obj = ma.group(1).strip()
 284             take_by_ptr = True
 285         elif ma.group(1).strip().startswith("LDKC3Tuple"):
 286             java_ty = "long"
 287             java_hu_ty = "ThreeTuple<"
 288             if not ma.group(1).strip() in tuple_types:
 289                 assert java_c_types_none_allowed
 290                 return None
 291             for idx, ty_info in enumerate(tuple_types[ma.group(1).strip()][0]):
 292                 if idx != 0:
 293                     java_hu_ty = java_hu_ty + ", "
 294                 if ty_info.is_native_primitive:
 295                     java_hu_ty = java_hu_ty + ty_info.java_hu_ty.title() # If we're a primitive, capitalize the first letter
 296                 else:
 297                     java_hu_ty = java_hu_ty + ty_info.java_hu_ty
 298             java_hu_ty = java_hu_ty + ">"
 299             c_ty = "jlong"
 300             fn_ty_arg = "J"
 301             fn_arg = ma.group(2).strip()
 302             rust_obj = ma.group(1).strip()
 303             take_by_ptr = True
 304         else:
 305             java_ty = "long"
 306             java_hu_ty = ma.group(1).strip().replace("LDK", "")
 307             c_ty = "jlong"
 308             fn_ty_arg = "J"
 309             fn_arg = ma.group(2).strip()
 310             rust_obj = ma.group(1).strip()
 311             take_by_ptr = True
 312
 313     if fn_arg.startswith(" *") or fn_arg.startswith("*"):
 314         fn_arg = fn_arg.replace("*", "").strip()
 315         is_ptr = True
 316         c_ty = "jlong"
 317         java_ty = "long"
 318         fn_ty_arg = "J"
 319         is_primitive = False
 320
 321     var_is_arr = var_is_arr_regex.match(fn_arg)
 322     if var_is_arr is not None or ret_arr_len is not None:
 323         assert(not take_by_ptr)
 324         assert(not is_ptr)
 325         java_ty = java_ty + "[]"
 326         c_ty = c_ty + "Array"
 327         if var_is_arr is not None:
 328             if var_is_arr.group(1) == "":
 329                 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,
 330                     passed_as_ptr=False, is_ptr=False, var_name="arg", arr_len=var_is_arr.group(2), arr_access=arr_access, is_native_primitive=False)
 331             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,
 332                 passed_as_ptr=False, is_ptr=False, var_name=var_is_arr.group(1), arr_len=var_is_arr.group(2), arr_access=arr_access, is_native_primitive=False)
 333
 334     if java_hu_ty is None:
 335         java_hu_ty = java_ty
 336     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,
 337         is_ptr=is_ptr, var_name=fn_arg, arr_len=arr_len, arr_access=arr_access, is_native_primitive=is_primitive)
 338
 339 fn_ptr_regex = re.compile("^extern const ([A-Za-z_0-9\* ]*) \(\*(.*)\)\((.*)\);$")
 340 fn_ret_arr_regex = re.compile("(.*) \(\*(.*)\((.*)\)\)\[([0-9]*)\];$")
 341 reg_fn_regex = re.compile("([A-Za-z_0-9\* ]* \*?)([a-zA-Z_0-9]*)\((.*)\);$")
 342 clone_fns = set()
 343 constructor_fns = {}
 344 with open(sys.argv[1]) as in_h:
 345     for line in in_h:
 346         reg_fn = reg_fn_regex.match(line)
 347         if reg_fn is not None:
 348             if reg_fn.group(2).endswith("_clone"):
 349                 clone_fns.add(reg_fn.group(2))
 350             else:
 351                 rty = java_c_types(reg_fn.group(1), None)
 352                 if rty is not None and rty.rust_obj is not None and reg_fn.group(2) == rty.java_hu_ty + "_new":
 353                     constructor_fns[rty.rust_obj] = reg_fn.group(3)
 354             continue
 355         arr_fn = fn_ret_arr_regex.match(line)
 356         if arr_fn is not None:
 357             if arr_fn.group(2).endswith("_clone"):
 358                 clone_fns.add(arr_fn.group(2))
 359             # No object constructors return arrays, as then they wouldn't be an object constructor
 360             continue
 361 java_c_types_none_allowed = False # C structs created by cbindgen are declared in dependency order
 362
 363 with open(sys.argv[1]) as in_h, open(sys.argv[2], "w") as out_java, open(sys.argv[4], "w") as out_c:
 364     def map_type(fn_arg, print_void, ret_arr_len, is_free):
 365         ty_info = java_c_types(fn_arg, ret_arr_len)
 366         return map_type_with_info(ty_info, print_void, ret_arr_len, is_free)
 367
 368     def map_type_with_info(ty_info, print_void, ret_arr_len, is_free):
 369         if ty_info.c_ty == "void":
 370             if not print_void:
 371                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 372                     arg_conv = None, arg_conv_name = None, arg_conv_cleanup = None,
 373                     ret_conv = None, ret_conv_name = None, to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 374         if ty_info.c_ty.endswith("Array"):
 375             arr_len = ty_info.arr_len
 376             if arr_len is not None:
 377                 arr_name = ty_info.var_name
 378             else:
 379                 arr_name = "ret"
 380                 arr_len = ret_arr_len
 381             if ty_info.c_ty == "jbyteArray":
 382                 ret_conv = ("jbyteArray " + arr_name + "_arr = (*_env)->NewByteArray(_env, " + arr_len + ");\n" + "(*_env)->SetByteArrayRegion(_env, " + arr_name + "_arr, 0, " + arr_len + ", ", "")
 383                 arg_conv_cleanup = None
 384                 if not arr_len.isdigit():
 385                     arg_conv = ty_info.rust_obj + " " + arr_name + "_ref;\n"
 386                     arg_conv = arg_conv + arr_name + "_ref." + ty_info.arr_access + " = (*_env)->GetByteArrayElements (_env, " + arr_name + ", NULL);\n"
 387                     arg_conv = arg_conv + arr_name + "_ref." + arr_len + " = (*_env)->GetArrayLength (_env, " + arr_name + ");"
 388                     arg_conv_cleanup = "(*_env)->ReleaseByteArrayElements(_env, " + arr_name + ", (int8_t*)" + arr_name + "_ref." + ty_info.arr_access + ", 0);"
 389                     ret_conv = (ty_info.rust_obj + " " + arr_name + "_var = ", "")
 390                     ret_conv = (ret_conv[0], ";\njbyteArray " + arr_name + "_arr = (*_env)->NewByteArray(_env, " + arr_name + "_var." + arr_len + ");\n")
 391                     ret_conv = (ret_conv[0], ret_conv[1] + "(*_env)->SetByteArrayRegion(_env, " + arr_name + "_arr, 0, " + arr_name + "_var." + arr_len + ", " + arr_name + "_var." + ty_info.arr_access + ");")
 392                 elif ty_info.rust_obj is not None:
 393                     arg_conv = ty_info.rust_obj + " " + arr_name + "_ref;\n"
 394                     arg_conv = arg_conv + "CHECK((*_env)->GetArrayLength (_env, " + arr_name + ") == " + arr_len + ");\n"
 395                     arg_conv = arg_conv + "(*_env)->GetByteArrayRegion (_env, " + arr_name + ", 0, " + arr_len + ", " + arr_name + "_ref." + ty_info.arr_access + ");"
 396                     ret_conv = (ret_conv[0], "." + ty_info.arr_access + ");")
 397                 else:
 398                     arg_conv = "unsigned char " + arr_name + "_arr[" + arr_len + "];\n"
 399                     arg_conv = arg_conv + "CHECK((*_env)->GetArrayLength (_env, " + arr_name + ") == " + arr_len + ");\n"
 400                     arg_conv = arg_conv + "(*_env)->GetByteArrayRegion (_env, " + arr_name + ", 0, " + arr_len + ", " + arr_name + "_arr);\n" + "unsigned char (*" + arr_name + "_ref)[" + arr_len + "] = &" + arr_name + "_arr;"
 401                     ret_conv = (ret_conv[0] + "*", ");")
 402                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 403                     arg_conv = arg_conv, arg_conv_name = arr_name + "_ref", arg_conv_cleanup = arg_conv_cleanup,
 404                     ret_conv = ret_conv, ret_conv_name = arr_name + "_arr", to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 405             else:
 406                 assert not arr_len.isdigit() # not implemented
 407                 assert ty_info.java_ty[len(ty_info.java_ty) - 2:] == "[]"
 408                 conv_name = "arr_conv_" + str(len(ty_info.java_hu_ty))
 409                 idxc = chr(ord('a') + (len(ty_info.java_hu_ty) % 26))
 410                 ty_info.subty.var_name = conv_name
 411                 subty = map_type_with_info(ty_info.subty, False, None, is_free)
 412                 if arr_name == "":
 413                     arr_name = "arg"
 414                 arg_conv = ty_info.rust_obj + " " + arr_name + "_constr;\n"
 415                 arg_conv = arg_conv + arr_name + "_constr." + arr_len + " = (*_env)->GetArrayLength (_env, " + arr_name + ");\n"
 416                 arg_conv = arg_conv + "if (" + arr_name + "_constr." + arr_len + " > 0)\n"
 417                 if subty.rust_obj is None:
 418                     szof = subty.c_ty
 419                 else:
 420                     szof = subty.rust_obj
 421                 arg_conv = arg_conv + "\t" + arr_name + "_constr." + ty_info.arr_access + " = MALLOC(" + arr_name + "_constr." + arr_len + " * sizeof(" + szof + "), \"" + ty_info.rust_obj + " Elements\");\n"
 422                 arg_conv = arg_conv + "else\n"
 423                 arg_conv = arg_conv + "\t" + arr_name + "_constr." + ty_info.arr_access + " = NULL;\n"
 424                 if not ty_info.java_ty[:len(ty_info.java_ty) - 2].endswith("[]"):
 425                     arg_conv = arg_conv + ty_info.java_ty.strip("[]") + "* " + arr_name + "_vals = (*_env)->Get" + ty_info.subty.java_ty.title() + "ArrayElements (_env, " + arr_name + ", NULL);\n"
 426                 arg_conv = arg_conv + "for (size_t " + idxc + " = 0; " + idxc + " < " + arr_name + "_constr." + arr_len + "; " + idxc + "++) {\n"
 427                 if not ty_info.java_ty[:len(ty_info.java_ty) - 2].endswith("[]"):
 428                     arg_conv = arg_conv + "\t" + ty_info.java_ty.strip("[]") + " " + conv_name + " = " + arr_name + "_vals[" + idxc + "];"
 429                     if subty.arg_conv is not None:
 430                         arg_conv = arg_conv + "\n\t" + subty.arg_conv.replace("\n", "\n\t")
 431                 else:
 432                     arg_conv = arg_conv + "\tjobject " + conv_name + " = (*_env)->GetObjectArrayElement(_env, " + arr_name + ", " + idxc + ");\n"
 433                     arg_conv = arg_conv + "\t" + subty.arg_conv.replace("\n", "\n\t")
 434                 arg_conv = arg_conv + "\n\t" + arr_name + "_constr." + ty_info.arr_access + "[" + idxc + "] = " + subty.arg_conv_name + ";\n}"
 435                 if not ty_info.java_ty[:len(ty_info.java_ty) - 2].endswith("[]"):
 436                     arg_conv = arg_conv + "\n(*_env)->Release" + ty_info.java_ty.strip("[]").title() + "ArrayElements (_env, " + arr_name + ", " + arr_name + "_vals, 0);"
 437                 if ty_info.is_ptr:
 438                     arg_conv_name = "&" + arr_name + "_constr"
 439                 else:
 440                     arg_conv_name = arr_name + "_constr"
 441                 arg_conv_cleanup = None
 442                 if ty_info.is_ptr:
 443                     arg_conv_cleanup = "FREE(" + arr_name + "_constr." + ty_info.arr_access + ");"
 444
 445                 if arr_name == "arg":
 446                     arr_name = "ret"
 447                 ret_conv = (ty_info.rust_obj + " " + arr_name + "_var = ", "")
 448                 if subty.ret_conv is None:
 449                     ret_conv = ("DUMMY", "DUMMY")
 450                 elif not ty_info.java_ty[:len(ty_info.java_ty) - 2].endswith("[]"):
 451                     ret_conv = (ret_conv[0], ";\n" + ty_info.c_ty + " " + arr_name + "_arr = (*_env)->New" + ty_info.java_ty.strip("[]").title() + "Array(_env, " + arr_name + "_var." + arr_len + ");\n")
 452                     ret_conv = (ret_conv[0], ret_conv[1] + subty.c_ty + " *" + arr_name + "_arr_ptr = (*_env)->GetPrimitiveArrayCritical(_env, " + arr_name + "_arr, NULL);\n")
 453                     ret_conv = (ret_conv[0], ret_conv[1] + "for (size_t " + idxc + " = 0; " + idxc + " < " + arr_name + "_var." + arr_len + "; " + idxc + "++) {\n")
 454                     ret_conv = (ret_conv[0], ret_conv[1] + "\t" + subty.ret_conv[0].replace("\n", "\n\t"))
 455                     ret_conv = (ret_conv[0], ret_conv[1] + arr_name + "_var." + ty_info.arr_access + "[" + idxc + "]" + subty.ret_conv[1].replace("\n", "\n\t"))
 456                     ret_conv = (ret_conv[0], ret_conv[1] + "\n\t" + arr_name + "_arr_ptr[" + idxc + "] = " + subty.ret_conv_name + ";\n")
 457                     ret_conv = (ret_conv[0], ret_conv[1] + "}\n(*_env)->ReleasePrimitiveArrayCritical(_env, " + arr_name + "_arr, " + arr_name + "_arr_ptr, 0);")
 458                 else:
 459                     ret_conv = (ret_conv[0], ";\n" + ty_info.c_ty + " " + arr_name + "_arr = (*_env)->NewObjectArray(_env, " + arr_name + "_var." + arr_len + ", NULL, NULL);\n") # XXX: second arg needs to be a clazz!
 460                     ret_conv = (ret_conv[0], ret_conv[1] + "for (size_t " + idxc + " = 0; " + idxc + " < " + arr_name + "_var." + arr_len + "; " + idxc + "++) {\n")
 461                     ret_conv = (ret_conv[0], ret_conv[1] + "\t" + subty.ret_conv[0].replace("\n", "\n\t"))
 462                     ret_conv = (ret_conv[0], ret_conv[1] + arr_name + "_var." + ty_info.arr_access + "[" + idxc + "]" + subty.ret_conv[1].replace("\n", "\n\t"))
 463                     ret_conv = (ret_conv[0], ret_conv[1] + "\n\t(*_env)->SetObjectArrayElement(_env, " + arr_name + "_arr, " + idxc + ", " + subty.ret_conv_name + ");")
 464                     ret_conv = (ret_conv[0], ret_conv[1] + "}")
 465                 if subty.rust_obj is not None and subty.rust_obj in opaque_structs:
 466                     ret_conv = (ret_conv[0], ret_conv[1] + "\nFREE(" + arr_name + "_var.data);")
 467
 468                 to_hu_conv = None
 469                 to_hu_conv_name = None
 470                 if subty.to_hu_conv is not None:
 471                     to_hu_conv = ty_info.java_hu_ty + " " + conv_name + "_arr = new " + ty_info.subty.java_hu_ty.split("<")[0] + "[" + arr_name + ".length];\n"
 472                     to_hu_conv = to_hu_conv + "for (int " + idxc + " = 0; " + idxc + " < " + arr_name + ".length; " + idxc + "++) {\n"
 473                     to_hu_conv = to_hu_conv + "\t" + subty.java_ty + " " + conv_name + " = " + arr_name + "[" + idxc + "];\n"
 474                     to_hu_conv = to_hu_conv + "\t" + subty.to_hu_conv.replace("\n", "\n\t") + "\n"
 475                     to_hu_conv = to_hu_conv + "\t" + conv_name + "_arr[" + idxc + "] = " + subty.to_hu_conv_name + ";\n}"
 476                     to_hu_conv_name = conv_name + "_arr"
 477                 from_hu_conv = None
 478                 if subty.from_hu_conv is not None:
 479                     if subty.java_ty == "long" and subty.java_hu_ty != "long":
 480                         from_hu_conv = ("Arrays.stream(" + arr_name + ").mapToLong(" + conv_name + " -> " + subty.from_hu_conv[0] + ").toArray()", "/* TODO 2 " + subty.java_hu_ty + "  */")
 481                     elif subty.java_ty == "long":
 482                         from_hu_conv = ("Arrays.stream(" + arr_name + ").map(" + conv_name + " -> " + subty.from_hu_conv[0] + ").toArray()", "/* TODO 2 " + subty.java_hu_ty + "  */")
 483                     else:
 484                         from_hu_conv = ("(" + ty_info.java_ty + ")Arrays.stream(" + arr_name + ").map(" + conv_name + " -> " + subty.from_hu_conv[0] + ").toArray()", "/* TODO 2 " + subty.java_hu_ty + "  */")
 485
 486                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 487                     arg_conv = arg_conv, arg_conv_name = arg_conv_name, arg_conv_cleanup = arg_conv_cleanup,
 488                     ret_conv = ret_conv, ret_conv_name = arr_name + "_arr", to_hu_conv = to_hu_conv, to_hu_conv_name = to_hu_conv_name, from_hu_conv = from_hu_conv)
 489         elif ty_info.java_ty == "String":
 490             if ty_info.arr_access is None:
 491                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 492                     arg_conv = None, arg_conv_name = None, arg_conv_cleanup = None,
 493                     ret_conv = ("jstring " + ty_info.var_name + "_conv = (*_env)->NewStringUTF(_env, ", ");"), ret_conv_name = ty_info.var_name + "_conv",
 494                     to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 495             else:
 496                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 497                     arg_conv = None, arg_conv_name = None, arg_conv_cleanup = None,
 498                     ret_conv = ("LDKStr " + ty_info.var_name + "_str = ",
 499                         ";\nchar* " + ty_info.var_name + "_buf = MALLOC(" + ty_info.var_name + "_str." + ty_info.arr_len + " + 1, \"str conv buf\");\n" +
 500                         "memcpy(" + ty_info.var_name + "_buf, " + ty_info.var_name + "_str." + ty_info.arr_access + ", " + ty_info.var_name + "_str." + ty_info.arr_len + ");\n" +
 501                         ty_info.var_name + "_buf[" + ty_info.var_name + "_str." + ty_info.arr_len + "] = 0;\n" +
 502                         "jstring " + ty_info.var_name + "_conv = (*_env)->NewStringUTF(_env, " + ty_info.var_name + "_str." + ty_info.arr_access + ");\n" +
 503                         "FREE(" + ty_info.var_name + "_buf);"),
 504                     ret_conv_name = ty_info.var_name + "_conv", to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 505         elif ty_info.var_name != "":
 506             # If we have a parameter name, print it (noting that it may indicate its a pointer)
 507             if ty_info.rust_obj is not None:
 508                 assert(ty_info.passed_as_ptr)
 509                 opaque_arg_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv;\n"
 510                 opaque_arg_conv = opaque_arg_conv + ty_info.var_name + "_conv.inner = (void*)(" + ty_info.var_name + " & (~1));\n"
 511                 opaque_arg_conv = opaque_arg_conv + ty_info.var_name + "_conv.is_owned = (" + ty_info.var_name + " & 1) || (" + ty_info.var_name + " == 0);"
 512                 if not ty_info.is_ptr and not is_free and not ty_info.pass_by_ref:
 513                     if (ty_info.java_hu_ty + "_clone") in clone_fns:
 514                         # TODO: This is a bit too naive, even with the checks above, we really need to know if rust wants a ref or not, not just if its pass as a ptr.
 515                         opaque_arg_conv = opaque_arg_conv + "\nif (" + ty_info.var_name + "_conv.inner != NULL)\n"
 516                         opaque_arg_conv = opaque_arg_conv + "\t" + ty_info.var_name + "_conv = " + ty_info.java_hu_ty + "_clone(&" + ty_info.var_name + "_conv);"
 517                     elif ty_info.passed_as_ptr:
 518                         opaque_arg_conv = opaque_arg_conv + "\n// Warning: we may need a move here but can't clone!"
 519                 if not ty_info.is_ptr:
 520                     if ty_info.rust_obj in unitary_enums:
 521                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 522                             arg_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv = " + ty_info.rust_obj + "_from_java(_env, " + ty_info.var_name + ");",
 523                             arg_conv_name = ty_info.var_name + "_conv",
 524                             arg_conv_cleanup = None,
 525                             ret_conv = ("jclass " + ty_info.var_name + "_conv = " + ty_info.rust_obj + "_to_java(_env, ", ");"),
 526                             ret_conv_name = ty_info.var_name + "_conv", to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 527                     if ty_info.rust_obj in opaque_structs:
 528                         ret_conv_suf = ";\nCHECK((((long)" + ty_info.var_name + "_var.inner) & 1) == 0); // We rely on a free low bit, malloc guarantees this.\n"
 529                         ret_conv_suf = ret_conv_suf + "CHECK((((long)&" + ty_info.var_name + "_var) & 1) == 0); // We rely on a free low bit, pointer alignment guarantees this.\n"
 530                         ret_conv_suf = ret_conv_suf + "long " + ty_info.var_name + "_ref;\n"
 531                         ret_conv_suf = ret_conv_suf + "if (" + ty_info.var_name + "_var.is_owned) {\n"
 532                         ret_conv_suf = ret_conv_suf + "\t" + ty_info.var_name + "_ref = (long)" + ty_info.var_name + "_var.inner | 1;\n"
 533                         ret_conv_suf = ret_conv_suf + "} else {\n"
 534                         ret_conv_suf = ret_conv_suf + "\t" + ty_info.var_name + "_ref = (long)&" + ty_info.var_name + "_var;\n"
 535                         ret_conv_suf = ret_conv_suf + "}"
 536                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 537                             arg_conv = opaque_arg_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 538                             ret_conv = (ty_info.rust_obj + " " + ty_info.var_name + "_var = ", ret_conv_suf),
 539                             ret_conv_name = ty_info.var_name + "_ref",
 540                             to_hu_conv = ty_info.java_hu_ty + " " + ty_info.var_name + "_hu_conv = new " + ty_info.java_hu_ty + "(null, " + ty_info.var_name + ");",
 541                             to_hu_conv_name = ty_info.var_name + "_hu_conv",
 542                             from_hu_conv = (ty_info.var_name + " == null ? 0 : " + ty_info.var_name + ".ptr & ~1", "this.ptrs_to.add(" + ty_info.var_name + ")"))
 543                     base_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv = *(" + ty_info.rust_obj + "*)" + ty_info.var_name + ";";
 544                     if ty_info.rust_obj in trait_structs:
 545                         if not is_free:
 546                             base_conv = base_conv + "\nif (" + ty_info.var_name + "_conv.free == " + ty_info.rust_obj + "_JCalls_free) {\n"
 547                             base_conv = base_conv + "\t// If this_arg is a JCalls struct, then we need to increment the refcnt in it.\n"
 548                             base_conv = base_conv + "\t" + ty_info.rust_obj + "_JCalls_clone(" + ty_info.var_name + "_conv.this_arg);\n}"
 549                         else:
 550                             base_conv = base_conv + "\n" + "FREE((void*)" + ty_info.var_name + ");"
 551                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 552                             arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 553                             ret_conv = ("CANT PASS TRAIT TO Java?", ""), ret_conv_name = "NO CONV POSSIBLE",
 554                             to_hu_conv = "DUMMY", to_hu_conv_name = None,
 555                             from_hu_conv = (ty_info.var_name + " == null ? 0 : " + ty_info.var_name + ".ptr", "this.ptrs_to.add(" + ty_info.var_name + ")"))
 556                     if ty_info.rust_obj != "LDKu8slice":
 557                         # Don't bother free'ing slices passed in - Rust doesn't auto-free the
 558                         # underlying unlike Vecs, and it gives Java more freedom.
 559                         base_conv = base_conv + "\nFREE((void*)" + ty_info.var_name + ");";
 560                     if ty_info.rust_obj in complex_enums:
 561                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 562                             arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 563                             ret_conv = ("long " + ty_info.var_name + "_ref = (long)&", ";"), ret_conv_name = ty_info.var_name + "_ref",
 564                             to_hu_conv = ty_info.java_hu_ty + " " + ty_info.var_name + "_hu_conv = " + ty_info.java_hu_ty + ".constr_from_ptr(" + ty_info.var_name + ");",
 565                             to_hu_conv_name = ty_info.var_name + "_hu_conv", from_hu_conv = (ty_info.var_name + ".conv_to_c()", ""))
 566                     if ty_info.rust_obj in tuple_types:
 567                         to_hu_conv_pfx = ""
 568                         to_hu_conv_sfx = ty_info.java_hu_ty + " " + ty_info.var_name + "_conv = new " + ty_info.java_hu_ty + "("
 569                         for idx, conv in enumerate(tuple_types[ty_info.rust_obj][0]):
 570                             if idx != 0:
 571                                 to_hu_conv_sfx = to_hu_conv_sfx + ", "
 572                             conv.var_name = ty_info.var_name + "_" + chr(idx + ord("a"))
 573                             conv_map = map_type_with_info(conv, False, None, is_free)
 574                             to_hu_conv_pfx = to_hu_conv_pfx + conv.java_ty + " " + ty_info.var_name + "_" + chr(idx + ord("a")) + " = " + "bindings." + tuple_types[ty_info.rust_obj][1] + "_get_" + chr(idx + ord("a")) + "(" + ty_info.var_name + ");\n"
 575                             if conv_map.to_hu_conv is not None:
 576                                 to_hu_conv_pfx = to_hu_conv_pfx + conv_map.to_hu_conv + ";\n"
 577                                 to_hu_conv_sfx = to_hu_conv_sfx + conv_map.to_hu_conv_name;
 578                             else:
 579                                 to_hu_conv_sfx = to_hu_conv_sfx + ty_info.var_name + "_" + chr(idx + ord("a"));
 580                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 581                             arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 582                             ret_conv = ("long " + ty_info.var_name + "_ref = (long)&", ";"), ret_conv_name = ty_info.var_name + "_ref",
 583                             to_hu_conv = to_hu_conv_pfx + to_hu_conv_sfx + ");", to_hu_conv_name = ty_info.var_name + "_conv", from_hu_conv = ("/*TODO b*/0", ""))
 584
 585                     # The manually-defined types - TxOut and Transaction
 586                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 587                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 588                         ret_conv = ("long " + ty_info.var_name + "_ref = (long)&", ";"), ret_conv_name = ty_info.var_name + "_ref",
 589                         to_hu_conv = ty_info.java_hu_ty + " " + ty_info.var_name + "_conv = new " +ty_info.java_hu_ty + "(null, " + ty_info.var_name + ");",
 590                         to_hu_conv_name = ty_info.var_name + "_conv", from_hu_conv = ("/*TODO 1*/0", ""))
 591                 else:
 592                     assert(not is_free)
 593                     if ty_info.rust_obj in opaque_structs:
 594                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 595                             arg_conv = opaque_arg_conv, arg_conv_name = "&" + ty_info.var_name + "_conv", arg_conv_cleanup = None,
 596                             ret_conv = None, ret_conv_name = None, to_hu_conv = "TODO 2", to_hu_conv_name = None,
 597                             from_hu_conv = (ty_info.var_name + " == null ? 0 : " + ty_info.var_name + ".ptr & ~1", "this.ptrs_to.add(" + ty_info.var_name + ")")) # its a pointer, no conv needed
 598                     elif ty_info.rust_obj in trait_structs:
 599                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 600                             arg_conv = ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)" + ty_info.var_name + ";",
 601                             arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 602                             ret_conv = None, ret_conv_name = None, to_hu_conv = "TODO 2.5", to_hu_conv_name = None,
 603                             from_hu_conv = (ty_info.var_name + " == null ? 0 : " + ty_info.var_name + ".ptr", "this.ptrs_to.add(" + ty_info.var_name + ")")) # its a pointer, no conv needed
 604                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 605                         arg_conv = ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)" + ty_info.var_name + ";",
 606                         arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 607                         ret_conv = None, ret_conv_name = None, to_hu_conv = "TODO 3", to_hu_conv_name = None, from_hu_conv = None) # its a pointer, no conv needed
 608             elif ty_info.is_ptr:
 609                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 610                     arg_conv = None, arg_conv_name = ty_info.var_name, arg_conv_cleanup = None,
 611                     ret_conv = None, ret_conv_name = None, to_hu_conv = "TODO 4", to_hu_conv_name = None, from_hu_conv = None)
 612             else:
 613                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 614                     arg_conv = None, arg_conv_name = ty_info.var_name, arg_conv_cleanup = None,
 615                     ret_conv = None, ret_conv_name = None, to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 616         elif not print_void:
 617             # We don't have a parameter name, and want one, just call it arg
 618             if ty_info.rust_obj is not None:
 619                 assert(not is_free or ty_info.rust_obj not in opaque_structs)
 620                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 621                     arg_conv = ty_info.rust_obj + " arg_conv = *(" + ty_info.rust_obj + "*)arg;\nFREE((void*)arg);",
 622                     arg_conv_name = "arg_conv", arg_conv_cleanup = None,
 623                     ret_conv = None, ret_conv_name = None, to_hu_conv = "TODO 7", to_hu_conv_name = None, from_hu_conv = None)
 624             else:
 625                 assert(not is_free)
 626                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 627                     arg_conv = None, arg_conv_name = "arg", arg_conv_cleanup = None,
 628                     ret_conv = None, ret_conv_name = None, to_hu_conv = "TODO 8", to_hu_conv_name = None, from_hu_conv = None)
 629         else:
 630             # We don't have a parameter name, and don't want one (cause we're returning)
 631             if ty_info.rust_obj is not None:
 632                 if not ty_info.is_ptr:
 633                     if ty_info.rust_obj in unitary_enums:
 634                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 635                             arg_conv = ty_info.rust_obj + " ret_conv = " + ty_info.rust_obj + "_from_java(_env, ret);",
 636                             arg_conv_name = "ret_conv", arg_conv_cleanup = None,
 637                             ret_conv = ("jclass ret = " + ty_info.rust_obj + "_to_java(_env, ", ");"), ret_conv_name = "ret",
 638                             to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 639                     if ty_info.rust_obj in opaque_structs:
 640                         # If we're returning a newly-allocated struct, we don't want Rust to ever
 641                         # free, instead relying on the Java GC to lose the ref. We undo this in
 642                         # any _free function.
 643                         # To avoid any issues, we first assert that the incoming object is non-ref.
 644                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 645                             ret_conv = (ty_info.rust_obj + " ret = ", ";"),
 646                             ret_conv_name = "((long)ret.inner) | (ret.is_owned ? 1 : 0)",
 647                             arg_conv = None, arg_conv_name = None, arg_conv_cleanup = None,
 648                             to_hu_conv = ty_info.java_hu_ty + " ret_hu_conv = new " + ty_info.java_hu_ty + "(null, ret);",
 649                             to_hu_conv_name = "ret_hu_conv", from_hu_conv = None)
 650                     elif ty_info.rust_obj in trait_structs:
 651                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 652                             ret_conv = (ty_info.rust_obj + "* ret = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n*ret = ", ";"),
 653                             ret_conv_name = "(long)ret",
 654                             arg_conv = None, arg_conv_name = None, arg_conv_cleanup = None,
 655                             to_hu_conv = ty_info.java_hu_ty + " ret_hu_conv = new " + ty_info.java_hu_ty + "(null, ret);\nret_hu_conv.ptrs_to.add(this);",
 656                             to_hu_conv_name = "ret_hu_conv", from_hu_conv = None)
 657                     else:
 658                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 659                             ret_conv = (ty_info.rust_obj + "* ret = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n*ret = ", ";"),
 660                             ret_conv_name = "(long)ret",
 661                             arg_conv = None, arg_conv_name = None, arg_conv_cleanup = None,
 662                             to_hu_conv = ty_info.java_hu_ty + " ret_hu_conv = new " + ty_info.java_hu_ty + "(null, ret);\nret_hu_conv.ptrs_to.add(this);",
 663                             to_hu_conv_name = "ret_hu_conv", from_hu_conv = None)
 664                 elif ty_info.rust_obj in trait_structs:
 665                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 666                         ret_conv = ("long ret = (long)", ";"), ret_conv_name = "ret",
 667                         arg_conv = None, arg_conv_name = None, arg_conv_cleanup = None,
 668                         to_hu_conv = ty_info.java_hu_ty + " ret_hu_conv = new " + ty_info.java_hu_ty + "(null, ret);\nret_hu_conv.ptrs_to.add(this);",
 669                         to_hu_conv_name = "ret_hu_conv", from_hu_conv = None)
 670                 else:
 671                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 672                         ret_conv = ("long ret = (long)", ";"), ret_conv_name = "ret",
 673                         arg_conv = None, arg_conv_name = None, arg_conv_cleanup = None,
 674                         to_hu_conv = "TODO c", to_hu_conv_name = None, from_hu_conv = None)
 675             else:
 676                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 677                     arg_conv = None, arg_conv_name = None, arg_conv_cleanup = None,
 678                     ret_conv = None, ret_conv_name = None,
 679                     to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 680
 681     def map_fn(line, re_match, ret_arr_len, c_call_string):
 682         out_java.write("\t// " + line)
 683         out_java.write("\tpublic static native ")
 684         out_c.write("JNIEXPORT ")
 685
 686         is_free = re_match.group(2).endswith("_free")
 687         struct_meth = re_match.group(2).split("_")[0]
 688
 689         ret_info = map_type(re_match.group(1), True, ret_arr_len, False)
 690         ret_info.print_ty()
 691
 692         if ret_info.ret_conv is not None:
 693             ret_conv_pfx, ret_conv_sfx = ret_info.ret_conv
 694
 695         out_java.write(" " + re_match.group(2) + "(")
 696         out_c.write(" JNICALL Java_org_ldk_impl_bindings_" + re_match.group(2).replace('_', '_1') + "(JNIEnv * _env, jclass _b")
 697
 698         arg_names = []
 699         default_constructor_args = {}
 700         takes_self = False
 701         args_known = not ret_info.passed_as_ptr or ret_info.rust_obj in opaque_structs or ret_info.rust_obj in trait_structs
 702         for idx, arg in enumerate(re_match.group(3).split(',')):
 703             if idx != 0:
 704                 out_java.write(", ")
 705             if arg != "void":
 706                 out_c.write(", ")
 707             arg_conv_info = map_type(arg, False, None, is_free)
 708             if arg_conv_info.c_ty != "void":
 709                 arg_conv_info.print_ty()
 710                 arg_conv_info.print_name()
 711             if arg_conv_info.arg_name == "this_ptr" or arg_conv_info.arg_name == "this_arg":
 712                 takes_self = True
 713             if arg_conv_info.passed_as_ptr and not arg_conv_info.rust_obj in opaque_structs:
 714                 if not arg_conv_info.rust_obj in trait_structs and not arg_conv_info.rust_obj in unitary_enums:
 715                     args_known = False
 716             if arg_conv_info.arg_conv is not None and "Warning" in arg_conv_info.arg_conv:
 717                 if arg_conv_info.rust_obj in constructor_fns:
 718                     assert not is_free
 719                     for explode_arg in constructor_fns[arg_conv_info.rust_obj].split(','):
 720                         explode_arg_conv = map_type(explode_arg, False, None, False)
 721                         if explode_arg_conv.c_ty == "void":
 722                             # We actually want to handle this case, but for now its only used in NetGraphMsgHandler::new()
 723                             # which ends up resulting in a redundant constructor - both without arguments for the NetworkGraph.
 724                             args_known = False
 725                         assert explode_arg_conv.arg_name != "this_ptr"
 726                         assert explode_arg_conv.arg_name != "this_arg"
 727                         if explode_arg_conv.passed_as_ptr and not explode_arg_conv.rust_obj in trait_structs:
 728                             args_known = False
 729                         if not arg_conv_info.arg_name in default_constructor_args:
 730                             default_constructor_args[arg_conv_info.arg_name] = []
 731                         default_constructor_args[arg_conv_info.arg_name].append(explode_arg_conv)
 732                 else:
 733                     args_known = False
 734             arg_names.append(arg_conv_info)
 735
 736         out_java_struct = None
 737         if ("LDK" + struct_meth in opaque_structs or "LDK" + struct_meth in trait_structs) and not is_free:
 738             out_java_struct = open(sys.argv[3] + "/structs/" + struct_meth + ".java", "a")
 739             if not args_known:
 740                 out_java_struct.write("\t// Skipped " + re_match.group(2) + "\n")
 741                 out_java_struct.close()
 742                 out_java_struct = None
 743             else:
 744                 meth_n = re_match.group(2)[len(struct_meth) + 1:]
 745                 if ret_info.rust_obj == "LDK" + struct_meth:
 746                     out_java_struct.write("\tpublic static " + ret_info.java_hu_ty + " constructor_" + meth_n + "(")
 747                 else:
 748                     out_java_struct.write("\tpublic " + ret_info.java_hu_ty + " " + meth_n + "(")
 749                 for idx, arg in enumerate(arg_names):
 750                     if idx != 0:
 751                         if not takes_self or idx > 1:
 752                             out_java_struct.write(", ")
 753                     if arg.java_ty != "void" and arg.arg_name != "this_ptr" and arg.arg_name != "this_arg":
 754                         if arg.arg_name in default_constructor_args:
 755                             for explode_idx, explode_arg in enumerate(default_constructor_args[arg.arg_name]):
 756                                 if explode_idx != 0:
 757                                     out_java_struct.write(", ")
 758                                 assert explode_arg.rust_obj in opaque_structs or explode_arg.rust_obj in trait_structs
 759                                 out_java_struct.write(explode_arg.java_hu_ty + " " + arg.arg_name + "_" + explode_arg.arg_name)
 760                         else:
 761                             out_java_struct.write(arg.java_hu_ty + " " + arg.arg_name)
 762
 763
 764         out_java.write(");\n")
 765         out_c.write(") {\n")
 766         if out_java_struct is not None:
 767             out_java_struct.write(") {\n")
 768
 769         for info in arg_names:
 770             if info.arg_conv is not None:
 771                 out_c.write("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
 772
 773         if ret_info.ret_conv is not None:
 774             out_c.write("\t" + ret_conv_pfx.replace('\n', '\n\t'))
 775         elif ret_info.c_ty != "void":
 776             out_c.write("\t" + ret_info.c_ty + " ret_val = ")
 777         else:
 778             out_c.write("\t")
 779
 780         if c_call_string is None:
 781             out_c.write(re_match.group(2) + "(")
 782         else:
 783             out_c.write(c_call_string)
 784         for idx, info in enumerate(arg_names):
 785             if info.arg_conv_name is not None:
 786                 if idx != 0:
 787                     out_c.write(", ")
 788                 elif c_call_string is not None:
 789                     continue
 790                 out_c.write(info.arg_conv_name)
 791         out_c.write(")")
 792         if ret_info.ret_conv is not None:
 793             out_c.write(ret_conv_sfx.replace('\n', '\n\t'))
 794         else:
 795             out_c.write(";")
 796         for info in arg_names:
 797             if info.arg_conv_cleanup is not None:
 798                 out_c.write("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
 799         if ret_info.ret_conv is not None:
 800             out_c.write("\n\treturn " + ret_info.ret_conv_name + ";")
 801         elif ret_info.c_ty != "void":
 802             out_c.write("\n\treturn ret_val;")
 803         out_c.write("\n}\n\n")
 804         if out_java_struct is not None:
 805             out_java_struct.write("\t\t")
 806             if ret_info.java_ty != "void":
 807                 out_java_struct.write(ret_info.java_ty + " ret = ")
 808             out_java_struct.write("bindings." + re_match.group(2) + "(")
 809             for idx, info in enumerate(arg_names):
 810                 if idx != 0:
 811                     out_java_struct.write(", ")
 812                 if info.arg_name == "this_ptr" or info.arg_name == "this_arg":
 813                     out_java_struct.write("this.ptr")
 814                 elif info.arg_name in default_constructor_args:
 815                     out_java_struct.write("bindings." + info.java_hu_ty + "_new(")
 816                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
 817                         if explode_idx != 0:
 818                             out_java_struct.write(", ")
 819                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
 820                         out_java_struct.write(explode_arg.from_hu_conv[0].replace(explode_arg.arg_name, expl_arg_name))
 821                     out_java_struct.write(")")
 822                 elif info.from_hu_conv is not None:
 823                     out_java_struct.write(info.from_hu_conv[0])
 824                 else:
 825                     out_java_struct.write(info.arg_name)
 826             out_java_struct.write(");\n")
 827             if ret_info.to_hu_conv is not None:
 828                 out_java_struct.write("\t\t" + ret_info.to_hu_conv.replace("\n", "\n\t\t") + "\n")
 829
 830             for info in arg_names:
 831                 if info.arg_name == "this_ptr" or info.arg_name == "this_arg":
 832                     pass
 833                 elif info.arg_name in default_constructor_args:
 834                     for explode_arg in default_constructor_args[info.arg_name]:
 835                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
 836                         out_java_struct.write("\t\t" + explode_arg.from_hu_conv[1].replace(explode_arg.arg_name, expl_arg_name).replace("this", ret_info.to_hu_conv_name) + ";\n")
 837                 elif info.from_hu_conv is not None and info.from_hu_conv[1] != "":
 838                     if ret_info.rust_obj == "LDK" + struct_meth and ret_info.to_hu_conv_name is not None:
 839                         out_java_struct.write("\t\t" + info.from_hu_conv[1].replace("this", ret_info.to_hu_conv_name) + ";\n")
 840                     else:
 841                         out_java_struct.write("\t\t" + info.from_hu_conv[1] + ";\n")
 842
 843             if ret_info.to_hu_conv_name is not None:
 844                 out_java_struct.write("\t\treturn " + ret_info.to_hu_conv_name + ";\n")
 845             elif ret_info.java_ty != "void" and ret_info.rust_obj != "LDK" + struct_meth:
 846                 out_java_struct.write("\t\treturn ret;\n")
 847             out_java_struct.write("\t}\n\n")
 848             out_java_struct.close()
 849
 850     def map_unitary_enum(struct_name, field_lines):
 851         with open(sys.argv[3] + "/enums/" + struct_name + ".java", "w") as out_java_enum:
 852             out_java_enum.write("package org.ldk.enums;\n\n")
 853             unitary_enums.add(struct_name)
 854             out_c.write("static inline " + struct_name + " " + struct_name + "_from_java(JNIEnv *env, jclass val) {\n")
 855             out_c.write("\tswitch ((*env)->CallIntMethod(env, val, ordinal_meth)) {\n")
 856             ord_v = 0
 857             for idx, struct_line in enumerate(field_lines):
 858                 if idx == 0:
 859                     out_java_enum.write("public enum " + struct_name + " {\n")
 860                 elif idx == len(field_lines) - 3:
 861                     assert(struct_line.endswith("_Sentinel,"))
 862                 elif idx == len(field_lines) - 2:
 863                     out_java_enum.write("\t; static native void init();\n")
 864                     out_java_enum.write("\tstatic { init(); }\n")
 865                     out_java_enum.write("}")
 866                     out_java.write("\tstatic { " + struct_name + ".values(); /* Force enum statics to run */ }\n")
 867                 elif idx == len(field_lines) - 1:
 868                     assert(struct_line == "")
 869                 else:
 870                     out_java_enum.write(struct_line + "\n")
 871                     out_c.write("\t\tcase %d: return %s;\n" % (ord_v, struct_line.strip().strip(",")))
 872                     ord_v = ord_v + 1
 873             out_c.write("\t}\n")
 874             out_c.write("\tabort();\n")
 875             out_c.write("}\n")
 876
 877             ord_v = 0
 878             out_c.write("static jclass " + struct_name + "_class = NULL;\n")
 879             for idx, struct_line in enumerate(field_lines):
 880                 if idx > 0 and idx < len(field_lines) - 3:
 881                     variant = struct_line.strip().strip(",")
 882                     out_c.write("static jfieldID " + struct_name + "_" + variant + " = NULL;\n")
 883             out_c.write("JNIEXPORT void JNICALL Java_org_ldk_enums_" + struct_name.replace("_", "_1") + "_init (JNIEnv * env, jclass clz) {\n")
 884             out_c.write("\t" + struct_name + "_class = (*env)->NewGlobalRef(env, clz);\n")
 885             out_c.write("\tCHECK(" + struct_name + "_class != NULL);\n")
 886             for idx, struct_line in enumerate(field_lines):
 887                 if idx > 0 and idx < len(field_lines) - 3:
 888                     variant = struct_line.strip().strip(",")
 889                     out_c.write("\t" + struct_name + "_" + variant + " = (*env)->GetStaticFieldID(env, " + struct_name + "_class, \"" + variant + "\", \"Lorg/ldk/enums/" + struct_name + ";\");\n")
 890                     out_c.write("\tCHECK(" + struct_name + "_" + variant + " != NULL);\n")
 891             out_c.write("}\n")
 892             out_c.write("static inline jclass " + struct_name + "_to_java(JNIEnv *env, " + struct_name + " val) {\n")
 893             out_c.write("\tswitch (val) {\n")
 894             for idx, struct_line in enumerate(field_lines):
 895                 if idx > 0 and idx < len(field_lines) - 3:
 896                     variant = struct_line.strip().strip(",")
 897                     out_c.write("\t\tcase " + variant + ":\n")
 898                     out_c.write("\t\t\treturn (*env)->GetStaticObjectField(env, " + struct_name + "_class, " + struct_name + "_" + variant + ");\n")
 899                     ord_v = ord_v + 1
 900             out_c.write("\t\tdefault: abort();\n")
 901             out_c.write("\t}\n")
 902             out_c.write("}\n\n")
 903
 904     def map_complex_enum(struct_name, union_enum_items):
 905         java_hu_type = struct_name.replace("LDK", "")
 906         complex_enums.add(struct_name)
 907         with open(sys.argv[3] + "/structs/" + java_hu_type + ".java", "w") as out_java_enum:
 908             out_java_enum.write(hu_struct_file_prefix)
 909             out_java_enum.write("public class " + java_hu_type + " extends CommonBase {\n")
 910             out_java_enum.write("\tprivate " + java_hu_type + "(Object _dummy, long ptr) { super(ptr); }\n")
 911             out_java_enum.write("\tlong conv_to_c() { assert false; return 0; /* Should only be called on subclasses */ }\n")
 912             out_java_enum.write("\tstatic " + java_hu_type + " constr_from_ptr(long ptr) {\n")
 913             out_java_enum.write("\t\tbindings." + struct_name + " raw_val = bindings." + struct_name + "_ref_from_ptr(ptr);\n")
 914             java_hu_subclasses = ""
 915
 916             tag_field_lines = union_enum_items["field_lines"]
 917             init_meth_jty_strs = {}
 918             for idx, struct_line in enumerate(tag_field_lines):
 919                 if idx == 0:
 920                     out_java.write("\tpublic static class " + struct_name + " {\n")
 921                     out_java.write("\t\tprivate " + struct_name + "() {}\n")
 922                 elif idx == len(tag_field_lines) - 3:
 923                     assert(struct_line.endswith("_Sentinel,"))
 924                 elif idx == len(tag_field_lines) - 2:
 925                     out_java.write("\t\tstatic native void init();\n")
 926                     out_java.write("\t}\n")
 927                 elif idx == len(tag_field_lines) - 1:
 928                     assert(struct_line == "")
 929                 else:
 930                     var_name = struct_line.strip(' ,')[len(struct_name) + 1:]
 931                     out_java.write("\t\tpublic final static class " + var_name + " extends " + struct_name + " {\n")
 932                     java_hu_subclasses = java_hu_subclasses + "\tpublic final static class " + var_name + " extends " + java_hu_type + " {\n"
 933                     out_java_enum.write("\t\tif (raw_val.getClass() == bindings." + struct_name + "." + var_name + ".class) {\n")
 934                     out_java_enum.write("\t\t\treturn new " + var_name + "(null, ptr);\n") # TODO: Conv values!
 935                     out_c.write("static jclass " + struct_name + "_" + var_name + "_class = NULL;\n")
 936                     out_c.write("static jmethodID " + struct_name + "_" + var_name + "_meth = NULL;\n")
 937                     init_meth_jty_str = ""
 938                     init_meth_params = ""
 939                     init_meth_body = ""
 940                     if "LDK" + var_name in union_enum_items:
 941                         enum_var_lines = union_enum_items["LDK" + var_name]
 942                         for idx, field in enumerate(enum_var_lines):
 943                             if idx != 0 and idx < len(enum_var_lines) - 2:
 944                                 field_ty = java_c_types(field.strip(' ;'), None)
 945                                 out_java.write("\t\t\tpublic " + field_ty.java_ty + " " + field_ty.var_name + ";\n")
 946                                 java_hu_subclasses = java_hu_subclasses + "\t\tpublic " + field_ty.java_hu_ty + " " + field_ty.var_name + ";\n"
 947                                 init_meth_jty_str = init_meth_jty_str + field_ty.java_fn_ty_arg
 948                                 if idx > 1:
 949                                     init_meth_params = init_meth_params + ", "
 950                                 init_meth_params = init_meth_params + field_ty.java_ty + " " + field_ty.var_name
 951                                 init_meth_body = init_meth_body + "this." + field_ty.var_name + " = " + field_ty.var_name + "; "
 952                         out_java.write("\t\t\t" + var_name + "(" + init_meth_params + ") { ")
 953                         out_java.write(init_meth_body)
 954                         out_java.write("}\n")
 955                     out_java.write("\t\t}\n")
 956                     out_java_enum.write("\t\t}\n")
 957                     java_hu_subclasses = java_hu_subclasses + "\t\tprivate " + var_name + "(Object _dummy, long ptr) { super(null, ptr); }\n"
 958                     java_hu_subclasses = java_hu_subclasses + "\t\t@Override long conv_to_c() { return 0; /*XXX*/ }\n"
 959                     java_hu_subclasses = java_hu_subclasses + "\t}\n"
 960                     init_meth_jty_strs[var_name] = init_meth_jty_str
 961             out_java_enum.write("\t\tassert false; return null; // Unreachable without extending the (internal) bindings interface\n\t}\n\n")
 962             out_java_enum.write(java_hu_subclasses)
 963             out_java.write("\tstatic { " + struct_name + ".init(); }\n")
 964             out_java.write("\tpublic static native " + struct_name + " " + struct_name + "_ref_from_ptr(long ptr);\n");
 965
 966             out_c.write("JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_00024" + struct_name.replace("_", "_1") + "_init (JNIEnv * env, jclass _a) {\n")
 967             for idx, struct_line in enumerate(tag_field_lines):
 968                 if idx != 0 and idx < len(tag_field_lines) - 3:
 969                     var_name = struct_line.strip(' ,')[len(struct_name) + 1:]
 970                     out_c.write("\t" + struct_name + "_" + var_name + "_class =\n")
 971                     out_c.write("\t\t(*env)->NewGlobalRef(env, (*env)->FindClass(env, \"Lorg/ldk/impl/bindings$" + struct_name + "$" + var_name + ";\"));\n")
 972                     out_c.write("\tCHECK(" + struct_name + "_" + var_name + "_class != NULL);\n")
 973                     out_c.write("\t" + struct_name + "_" + var_name + "_meth = (*env)->GetMethodID(env, " + struct_name + "_" + var_name + "_class, \"<init>\", \"(" + init_meth_jty_strs[var_name] + ")V\");\n")
 974                     out_c.write("\tCHECK(" + struct_name + "_" + var_name + "_meth != NULL);\n")
 975             out_c.write("}\n")
 976             out_c.write("JNIEXPORT jobject JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1ref_1from_1ptr (JNIEnv * _env, jclass _c, jlong ptr) {\n")
 977             out_c.write("\t" + struct_name + " *obj = (" + struct_name + "*)ptr;\n")
 978             out_c.write("\tswitch(obj->tag) {\n")
 979             for idx, struct_line in enumerate(tag_field_lines):
 980                 if idx != 0 and idx < len(tag_field_lines) - 3:
 981                     var_name = struct_line.strip(' ,')[len(struct_name) + 1:]
 982                     out_c.write("\t\tcase " + struct_name + "_" + var_name + ": {\n")
 983                     c_params_text = ""
 984                     if "LDK" + var_name in union_enum_items:
 985                         enum_var_lines = union_enum_items["LDK" + var_name]
 986                         for idx, field in enumerate(enum_var_lines):
 987                             if idx != 0 and idx < len(enum_var_lines) - 2:
 988                                 field_map = map_type(field.strip(' ;'), False, None, False)
 989                                 if field_map.ret_conv is not None:
 990                                     out_c.write("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
 991                                     out_c.write("obj->" + camel_to_snake(var_name) + "." + field_map.arg_name)
 992                                     out_c.write(field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
 993                                     c_params_text = c_params_text + ", " + field_map.ret_conv_name
 994                                 else:
 995                                     c_params_text = c_params_text + ", obj->" + camel_to_snake(var_name) + "." + field_map.arg_name
 996                     out_c.write("\t\t\treturn (*_env)->NewObject(_env, " + struct_name + "_" + var_name + "_class, " + struct_name + "_" + var_name + "_meth" + c_params_text + ");\n")
 997                     out_c.write("\t\t}\n")
 998             out_c.write("\t\tdefault: abort();\n")
 999             out_c.write("\t}\n}\n")
1000             out_java_enum.write("}\n")
1001
1002     def map_trait(struct_name, field_var_lines, trait_fn_lines):
1003         with open(sys.argv[3] + "/structs/" + struct_name.replace("LDK","") + ".java", "w") as out_java_trait:
1004             out_c.write("typedef struct " + struct_name + "_JCalls {\n")
1005             out_c.write("\tatomic_size_t refcnt;\n")
1006             out_c.write("\tJavaVM *vm;\n")
1007             out_c.write("\tjweak o;\n")
1008             for var_line in field_var_lines:
1009                 if var_line.group(1) in trait_structs:
1010                     out_c.write("\t" + var_line.group(1) + "_JCalls* " + var_line.group(2) + ";\n")
1011             for fn_line in trait_fn_lines:
1012                 if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
1013                     out_c.write("\tjmethodID " + fn_line.group(2) + "_meth;\n")
1014             out_c.write("} " + struct_name + "_JCalls;\n")
1015
1016             out_java_trait.write(hu_struct_file_prefix)
1017             out_java_trait.write("public class " + struct_name.replace("LDK","") + " extends CommonBase {\n")
1018             out_java_trait.write("\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); }\n")
1019             out_java_trait.write("\tpublic " + struct_name.replace("LDK", "") + "(bindings." + struct_name + " arg") # XXX: Should be priv ( but is currently used in tests
1020             for var_line in field_var_lines:
1021                 if var_line.group(1) in trait_structs:
1022                     out_java_trait.write(", bindings." + var_line.group(1) + " " + var_line.group(2))
1023             out_java_trait.write(") {\n")
1024             out_java_trait.write("\t\tsuper(bindings." + struct_name + "_new(arg")
1025             for var_line in field_var_lines:
1026                 if var_line.group(1) in trait_structs:
1027                     out_java_trait.write(", " + var_line.group(2))
1028             out_java_trait.write("));\n")
1029             out_java_trait.write("\t\tthis.ptrs_to.add(arg);\n")
1030             out_java_trait.write("\t}\n")
1031             out_java_trait.write("\t@Override @SuppressWarnings(\"deprecation\")\n")
1032             out_java_trait.write("\tprotected void finalize() throws Throwable {\n")
1033             out_java_trait.write("\t\tbindings." + struct_name.replace("LDK","") + "_free(ptr); super.finalize();\n")
1034             out_java_trait.write("\t}\n\n")
1035
1036             java_trait_constr = "\tpublic " + struct_name.replace("LDK", "") + "(" + struct_name.replace("LDK", "") + "Interface arg) {\n"
1037             java_trait_constr = java_trait_constr + "\t\tthis(new bindings." + struct_name + "() {\n"
1038             #out_java_trait.write("\tpublic static interface " + struct_name.replace("LDK", "") + "Interface {\n")
1039             out_java.write("\tpublic interface " + struct_name + " {\n")
1040             java_meths = []
1041             for fn_line in trait_fn_lines:
1042                 java_meth_descr = "("
1043                 if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
1044                     ret_ty_info = map_type(fn_line.group(1), True, None, False)
1045
1046                     out_java.write("\t\t " + ret_ty_info.java_ty + " " + fn_line.group(2) + "(")
1047                     java_trait_constr = java_trait_constr + "\t\t\t@Override public " + ret_ty_info.java_ty + " " + fn_line.group(2) + "("
1048                     #out_java_trait.write("\t\t" + ret_ty_info.java_hu_ty + " " + fn_line.group(2) + "(")
1049                     is_const = fn_line.group(3) is not None
1050                     out_c.write(fn_line.group(1) + fn_line.group(2) + "_jcall(")
1051                     if is_const:
1052                         out_c.write("const void* this_arg")
1053                     else:
1054                         out_c.write("void* this_arg")
1055
1056                     arg_names = []
1057                     for idx, arg in enumerate(fn_line.group(4).split(',')):
1058                         if arg == "":
1059                             continue
1060                         if idx >= 2:
1061                             out_java.write(", ")
1062                             java_trait_constr = java_trait_constr + ", "
1063                             #out_java_trait.write(", ")
1064                         out_c.write(", ")
1065                         arg_conv_info = map_type(arg, True, None, False)
1066                         out_c.write(arg.strip())
1067                         out_java.write(arg_conv_info.java_ty + " " + arg_conv_info.arg_name)
1068                         #out_java_trait.write(arg_conv_info.java_ty + " " + arg_conv_info.arg_name)
1069                         java_trait_constr = java_trait_constr + arg_conv_info.java_ty + " " + arg_conv_info.arg_name
1070                         arg_names.append(arg_conv_info)
1071                         java_meth_descr = java_meth_descr + arg_conv_info.java_fn_ty_arg
1072                     java_meth_descr = java_meth_descr + ")" + ret_ty_info.java_fn_ty_arg
1073                     java_meths.append(java_meth_descr)
1074
1075                     out_java.write(");\n")
1076                     #out_java_trait.write(");\n")
1077                     java_trait_constr = java_trait_constr + ") {\n"
1078                     out_c.write(") {\n")
1079                     out_c.write("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
1080                     out_c.write("\tJNIEnv *_env;\n")
1081                     out_c.write("\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&_env, JNI_VERSION_1_8) == JNI_OK);\n")
1082
1083                     for arg_info in arg_names:
1084                         if arg_info.ret_conv is not None:
1085                             out_c.write("\t" + arg_info.ret_conv[0].replace('\n', '\n\t'));
1086                             out_c.write(arg_info.arg_name)
1087                             out_c.write(arg_info.ret_conv[1].replace('\n', '\n\t') + "\n")
1088
1089                     out_c.write("\tjobject obj = (*_env)->NewLocalRef(_env, j_calls->o);\n\tCHECK(obj != NULL);\n")
1090                     if ret_ty_info.c_ty.endswith("Array"):
1091                         out_c.write("\t" + ret_ty_info.c_ty + " ret = (*_env)->CallObjectMethod(_env, obj, j_calls->" + fn_line.group(2) + "_meth")
1092                     elif not ret_ty_info.passed_as_ptr:
1093                         out_c.write("\treturn (*_env)->Call" + ret_ty_info.java_ty.title() + "Method(_env, obj, j_calls->" + fn_line.group(2) + "_meth")
1094                     else:
1095                         out_c.write("\t" + fn_line.group(1).strip() + "* ret = (" + fn_line.group(1).strip() + "*)(*_env)->CallLongMethod(_env, obj, j_calls->" + fn_line.group(2) + "_meth");
1096                     if ret_ty_info.java_ty != "void":
1097                         java_trait_constr = java_trait_constr + "\t\t\t\treturn arg." + fn_line.group(2) + "("
1098                     else:
1099                         java_trait_constr = java_trait_constr + "\t\t\t\targ." + fn_line.group(2) + "("
1100
1101                     for arg_info in arg_names:
1102                         if arg_info.ret_conv is not None:
1103                             out_c.write(", " + arg_info.ret_conv_name)
1104                         else:
1105                             out_c.write(", " + arg_info.arg_name)
1106                     out_c.write(");\n");
1107                     if ret_ty_info.arg_conv is not None:
1108                         out_c.write("\t" + ret_ty_info.arg_conv.replace("\n", "\n\t").replace("arg", "ret") + "\n\treturn " + ret_ty_info.arg_conv_name.replace("arg", "ret") + ";\n")
1109
1110                     if ret_ty_info.passed_as_ptr:
1111                         out_c.write("\t" + fn_line.group(1).strip() + " res = *ret;\n")
1112                         out_c.write("\tFREE(ret);\n")
1113                         out_c.write("\treturn res;\n")
1114                     out_c.write("}\n")
1115                     java_trait_constr = java_trait_constr + ");\n\t\t\t}\n"
1116                 elif fn_line.group(2) == "free":
1117                     out_c.write("static void " + struct_name + "_JCalls_free(void* this_arg) {\n")
1118                     out_c.write("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
1119                     out_c.write("\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n")
1120                     out_c.write("\t\tJNIEnv *env;\n")
1121                     out_c.write("\t\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_8) == JNI_OK);\n")
1122                     out_c.write("\t\t(*env)->DeleteWeakGlobalRef(env, j_calls->o);\n")
1123                     out_c.write("\t\tFREE(j_calls);\n")
1124                     out_c.write("\t}\n}\n")
1125             #out_java_trait.write("\t}\n")
1126             #out_java_trait.write(java_trait_constr + "\t\t});\n\t}\n")
1127
1128             # Write out a clone function whether we need one or not, as we use them in moving to rust
1129             out_c.write("static void* " + struct_name + "_JCalls_clone(const void* this_arg) {\n")
1130             out_c.write("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
1131             out_c.write("\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n")
1132             for var_line in field_var_lines:
1133                 if var_line.group(1) in trait_structs:
1134                     out_c.write("\tatomic_fetch_add_explicit(&j_calls->" + var_line.group(2) + "->refcnt, 1, memory_order_release);\n")
1135             out_c.write("\treturn (void*) this_arg;\n")
1136             out_c.write("}\n")
1137
1138             out_java.write("\t}\n")
1139
1140             out_java.write("\tpublic static native long " + struct_name + "_new(" + struct_name + " impl")
1141             out_c.write("static inline " + struct_name + " " + struct_name + "_init (JNIEnv * env, jclass _a, jobject o")
1142             for var_line in field_var_lines:
1143                 if var_line.group(1) in trait_structs:
1144                     out_java.write(", " + var_line.group(1) + " " + var_line.group(2))
1145                     out_c.write(", jobject " + var_line.group(2))
1146             out_java.write(");\n")
1147             out_c.write(") {\n")
1148
1149             out_c.write("\tjclass c = (*env)->GetObjectClass(env, o);\n")
1150             out_c.write("\tCHECK(c != NULL);\n")
1151             out_c.write("\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n")
1152             out_c.write("\tatomic_init(&calls->refcnt, 1);\n")
1153             out_c.write("\tDO_ASSERT((*env)->GetJavaVM(env, &calls->vm) == 0);\n")
1154             out_c.write("\tcalls->o = (*env)->NewWeakGlobalRef(env, o);\n")
1155             for (fn_line, java_meth_descr) in zip(trait_fn_lines, java_meths):
1156                 if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
1157                     out_c.write("\tcalls->" + fn_line.group(2) + "_meth = (*env)->GetMethodID(env, c, \"" + fn_line.group(2) + "\", \"" + java_meth_descr + "\");\n")
1158                     out_c.write("\tCHECK(calls->" + fn_line.group(2) + "_meth != NULL);\n")
1159             out_c.write("\n\t" + struct_name + " ret = {\n")
1160             out_c.write("\t\t.this_arg = (void*) calls,\n")
1161             for fn_line in trait_fn_lines:
1162                 if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
1163                     out_c.write("\t\t." + fn_line.group(2) + " = " + fn_line.group(2) + "_jcall,\n")
1164                 elif fn_line.group(2) == "free":
1165                     out_c.write("\t\t.free = " + struct_name + "_JCalls_free,\n")
1166                 else:
1167                     clone_fns.add(struct_name + "_clone")
1168                     out_c.write("\t\t.clone = " + struct_name + "_JCalls_clone,\n")
1169             for var_line in field_var_lines:
1170                 if var_line.group(1) in trait_structs:
1171                     out_c.write("\t\t." + var_line.group(2) + " = " + var_line.group(1) + "_init(env, _a, " + var_line.group(2) + "),\n")
1172             out_c.write("\t};\n")
1173             for var_line in field_var_lines:
1174                 if var_line.group(1) in trait_structs:
1175                     out_c.write("\tcalls->" + var_line.group(2) + " = ret." + var_line.group(2) + ".this_arg;\n")
1176             out_c.write("\treturn ret;\n")
1177             out_c.write("}\n")
1178
1179             out_c.write("JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1new (JNIEnv * env, jclass _a, jobject o")
1180             for var_line in field_var_lines:
1181                 if var_line.group(1) in trait_structs:
1182                     out_c.write(", jobject " + var_line.group(2))
1183             out_c.write(") {\n")
1184             out_c.write("\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n")
1185             out_c.write("\t*res_ptr = " + struct_name + "_init(env, _a, o")
1186             for var_line in field_var_lines:
1187                 if var_line.group(1) in trait_structs:
1188                     out_c.write(", " + var_line.group(2))
1189             out_c.write(");\n")
1190             out_c.write("\treturn (long)res_ptr;\n")
1191             out_c.write("}\n")
1192
1193             out_java.write("\tpublic static native " + struct_name + " " + struct_name + "_get_obj_from_jcalls(long val);\n")
1194             out_c.write("JNIEXPORT jobject JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1get_1obj_1from_1jcalls (JNIEnv * env, jclass _a, jlong val) {\n")
1195             out_c.write("\tjobject ret = (*env)->NewLocalRef(env, ((" + struct_name + "_JCalls*)val)->o);\n")
1196             out_c.write("\tCHECK(ret != NULL);\n")
1197             out_c.write("\treturn ret;\n")
1198             out_c.write("}\n")
1199
1200         for fn_line in trait_fn_lines:
1201             # For now, just disable enabling the _call_log - we don't know how to inverse-map String
1202             is_log = fn_line.group(2) == "log" and struct_name == "LDKLogger"
1203             if fn_line.group(2) != "free" and fn_line.group(2) != "clone" and fn_line.group(2) != "eq" and not is_log:
1204                 dummy_line = fn_line.group(1) + struct_name.replace("LDK", "") + "_" + fn_line.group(2) + " " + struct_name + "* this_arg" + fn_line.group(4) + "\n"
1205                 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(2) + ")(this_arg_conv->this_arg")
1206
1207     out_c.write("""#include \"org_ldk_impl_bindings.h\"
1208 #include <rust_types.h>
1209 #include <lightning.h>
1210 #include <string.h>
1211 #include <stdatomic.h>
1212 """)
1213
1214     if sys.argv[4] == "false":
1215         out_c.write("#define MALLOC(a, _) malloc(a)\n")
1216         out_c.write("#define FREE(p) if ((p) > 1024) { free(p); }\n")
1217         out_c.write("#define DO_ASSERT(a) (void)(a)\n")
1218         out_c.write("#define CHECK(a)\n")
1219     else:
1220         out_c.write("""#include <assert.h>
1221 // Always run a, then assert it is true:
1222 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
1223 // Assert a is true or do nothing
1224 #define CHECK(a) DO_ASSERT(a)
1225
1226 // Running a leak check across all the allocations and frees of the JDK is a mess,
1227 // so instead we implement our own naive leak checker here, relying on the -wrap
1228 // linker option to wrap malloc/calloc/realloc/free, tracking everyhing allocated
1229 // and free'd in Rust or C across the generated bindings shared library.
1230 #include <threads.h>
1231 #include <execinfo.h>
1232 #include <unistd.h>
1233 static mtx_t allocation_mtx;
1234
1235 void __attribute__((constructor)) init_mtx() {
1236         DO_ASSERT(mtx_init(&allocation_mtx, mtx_plain) == thrd_success);
1237 }
1238
1239 #define BT_MAX 128
1240 typedef struct allocation {
1241         struct allocation* next;
1242         void* ptr;
1243         const char* struct_name;
1244         void* bt[BT_MAX];
1245         int bt_len;
1246 } allocation;
1247 static allocation* allocation_ll = NULL;
1248
1249 void* __real_malloc(size_t len);
1250 void* __real_calloc(size_t nmemb, size_t len);
1251 static void new_allocation(void* res, const char* struct_name) {
1252         allocation* new_alloc = __real_malloc(sizeof(allocation));
1253         new_alloc->ptr = res;
1254         new_alloc->struct_name = struct_name;
1255         new_alloc->bt_len = backtrace(new_alloc->bt, BT_MAX);
1256         DO_ASSERT(mtx_lock(&allocation_mtx) == thrd_success);
1257         new_alloc->next = allocation_ll;
1258         allocation_ll = new_alloc;
1259         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
1260 }
1261 static void* MALLOC(size_t len, const char* struct_name) {
1262         void* res = __real_malloc(len);
1263         new_allocation(res, struct_name);
1264         return res;
1265 }
1266 void __real_free(void* ptr);
1267 static void alloc_freed(void* ptr) {
1268         allocation* p = NULL;
1269         DO_ASSERT(mtx_lock(&allocation_mtx) == thrd_success);
1270         allocation* it = allocation_ll;
1271         while (it->ptr != ptr) { p = it; it = it->next; }
1272         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
1273         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
1274         DO_ASSERT(it->ptr == ptr);
1275         __real_free(it);
1276 }
1277 static void FREE(void* ptr) {
1278         if ((long)ptr < 1024) return; // Rust loves to create pointers to the NULL page for dummys
1279         alloc_freed(ptr);
1280         __real_free(ptr);
1281 }
1282
1283 void* __wrap_malloc(size_t len) {
1284         void* res = __real_malloc(len);
1285         new_allocation(res, "malloc call");
1286         return res;
1287 }
1288 void* __wrap_calloc(size_t nmemb, size_t len) {
1289         void* res = __real_calloc(nmemb, len);
1290         new_allocation(res, "calloc call");
1291         return res;
1292 }
1293 void __wrap_free(void* ptr) {
1294         alloc_freed(ptr);
1295         __real_free(ptr);
1296 }
1297
1298 void* __real_realloc(void* ptr, size_t newlen);
1299 void* __wrap_realloc(void* ptr, size_t len) {
1300         alloc_freed(ptr);
1301         void* res = __real_realloc(ptr, len);
1302         new_allocation(res, "realloc call");
1303         return res;
1304 }
1305 void __wrap_reallocarray(void* ptr, size_t new_sz) {
1306         // Rust doesn't seem to use reallocarray currently
1307         assert(false);
1308 }
1309
1310 void __attribute__((destructor)) check_leaks() {
1311         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
1312                 fprintf(stderr, "%s %p remains:\\n", a->struct_name, a->ptr);
1313                 backtrace_symbols_fd(a->bt, a->bt_len, STDERR_FILENO);
1314                 fprintf(stderr, "\\n\\n");
1315         }
1316         DO_ASSERT(allocation_ll == NULL);
1317 }
1318 """)
1319     out_java.write("""package org.ldk.impl;
1320 import org.ldk.enums.*;
1321
1322 public class bindings {
1323         public static class VecOrSliceDef {
1324                 public long dataptr;
1325                 public long datalen;
1326                 public long stride;
1327                 public VecOrSliceDef(long dataptr, long datalen, long stride) {
1328                         this.dataptr = dataptr; this.datalen = datalen; this.stride = stride;
1329                 }
1330         }
1331         static {
1332                 System.loadLibrary(\"lightningjni\");
1333                 init(java.lang.Enum.class, VecOrSliceDef.class);
1334         }
1335         static native void init(java.lang.Class c, java.lang.Class slicedef);
1336
1337         public static native boolean deref_bool(long ptr);
1338         public static native long deref_long(long ptr);
1339         public static native void free_heap_ptr(long ptr);
1340         public static native byte[] read_bytes(long ptr, long len);
1341         public static native byte[] get_u8_slice_bytes(long slice_ptr);
1342         public static native long bytes_to_u8_vec(byte[] bytes);
1343         public static native long new_txpointer_copy_data(byte[] txdata);
1344         public static native long vec_slice_len(long vec);
1345         public static native long new_empty_slice_vec();
1346
1347 """)
1348     out_c.write("""
1349 static jmethodID ordinal_meth = NULL;
1350 static jmethodID slicedef_meth = NULL;
1351 static jclass slicedef_cls = NULL;
1352 JNIEXPORT void Java_org_ldk_impl_bindings_init(JNIEnv * env, jclass _b, jclass enum_class, jclass slicedef_class) {
1353         ordinal_meth = (*env)->GetMethodID(env, enum_class, "ordinal", "()I");
1354         CHECK(ordinal_meth != NULL);
1355         slicedef_meth = (*env)->GetMethodID(env, slicedef_class, "<init>", "(JJJ)V");
1356         CHECK(slicedef_meth != NULL);
1357         slicedef_cls = (*env)->NewGlobalRef(env, slicedef_class);
1358         CHECK(slicedef_cls != NULL);
1359 }
1360
1361 JNIEXPORT jboolean JNICALL Java_org_ldk_impl_bindings_deref_1bool (JNIEnv * env, jclass _a, jlong ptr) {
1362         return *((bool*)ptr);
1363 }
1364 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_deref_1long (JNIEnv * env, jclass _a, jlong ptr) {
1365         return *((long*)ptr);
1366 }
1367 JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_free_1heap_1ptr (JNIEnv * env, jclass _a, jlong ptr) {
1368         FREE((void*)ptr);
1369 }
1370 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_read_1bytes (JNIEnv * _env, jclass _b, jlong ptr, jlong len) {
1371         jbyteArray ret_arr = (*_env)->NewByteArray(_env, len);
1372         (*_env)->SetByteArrayRegion(_env, ret_arr, 0, len, (unsigned char*)ptr);
1373         return ret_arr;
1374 }
1375 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_get_1u8_1slice_1bytes (JNIEnv * _env, jclass _b, jlong slice_ptr) {
1376         LDKu8slice *slice = (LDKu8slice*)slice_ptr;
1377         jbyteArray ret_arr = (*_env)->NewByteArray(_env, slice->datalen);
1378         (*_env)->SetByteArrayRegion(_env, ret_arr, 0, slice->datalen, slice->data);
1379         return ret_arr;
1380 }
1381 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_bytes_1to_1u8_1vec (JNIEnv * _env, jclass _b, jbyteArray bytes) {
1382         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "LDKCVec_u8");
1383         vec->datalen = (*_env)->GetArrayLength(_env, bytes);
1384         vec->data = (uint8_t*)MALLOC(vec->datalen, "LDKCVec_u8Z Bytes");
1385         (*_env)->GetByteArrayRegion (_env, bytes, 0, vec->datalen, vec->data);
1386         return (long)vec;
1387 }
1388 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_new_1txpointer_1copy_1data (JNIEnv * env, jclass _b, jbyteArray bytes) {
1389         LDKTransaction *txdata = (LDKTransaction*)MALLOC(sizeof(LDKTransaction), "LDKTransaction");
1390         txdata->datalen = (*env)->GetArrayLength(env, bytes);
1391         txdata->data = (uint8_t*)MALLOC(txdata->datalen, "Tx Data Bytes");
1392         txdata->data_is_owned = true;
1393         (*env)->GetByteArrayRegion (env, bytes, 0, txdata->datalen, txdata->data);
1394         return (long)txdata;
1395 }
1396 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_vec_1slice_1len (JNIEnv * env, jclass _a, jlong ptr) {
1397         // Check offsets of a few Vec types are all consistent as we're meant to be generic across types
1398         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_SignatureZ, datalen), "Vec<*> needs to be mapped identically");
1399         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_MessageSendEventZ, datalen), "Vec<*> needs to be mapped identically");
1400         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_EventZ, datalen), "Vec<*> needs to be mapped identically");
1401         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_C2Tuple_usizeTransactionZZ, datalen), "Vec<*> needs to be mapped identically");
1402         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)ptr;
1403         return (long)vec->datalen;
1404 }
1405 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_new_1empty_1slice_1vec (JNIEnv * _env, jclass _b) {
1406         // Check sizes of a few Vec types are all consistent as we're meant to be generic across types
1407         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_SignatureZ), "Vec<*> needs to be mapped identically");
1408         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_MessageSendEventZ), "Vec<*> needs to be mapped identically");
1409         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_EventZ), "Vec<*> needs to be mapped identically");
1410         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_C2Tuple_usizeTransactionZZ), "Vec<*> needs to be mapped identically");
1411         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "Empty LDKCVec");
1412         vec->data = NULL;
1413         vec->datalen = 0;
1414         return (long)vec;
1415 }
1416
1417 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
1418 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
1419 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
1420 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
1421
1422 """)
1423
1424     with open(sys.argv[3] + "/structs/CommonBase.java", "a") as out_java_struct:
1425         out_java_struct.write("""package org.ldk.structs;
1426 import java.util.LinkedList;
1427 class CommonBase {
1428         final long ptr;
1429         LinkedList<Object> ptrs_to = new LinkedList();
1430         protected CommonBase(long ptr) { this.ptr = ptr; }
1431         public long _test_only_get_ptr() { return this.ptr; }
1432 }
1433 """)
1434
1435     in_block_comment = False
1436     cur_block_obj = None
1437
1438     const_val_regex = re.compile("^extern const ([A-Za-z_0-9]*) ([A-Za-z_0-9]*);$")
1439
1440     line_indicates_result_regex = re.compile("^   (LDKCResultPtr_[A-Za-z_0-9]*) contents;$")
1441     line_indicates_vec_regex = re.compile("^   ([A-Za-z_0-9]*) \*data;$")
1442     line_indicates_opaque_regex = re.compile("^   bool is_owned;$")
1443     line_indicates_trait_regex = re.compile("^   ([A-Za-z_0-9]* \*?)\(\*([A-Za-z_0-9]*)\)\((const )?void \*this_arg(.*)\);$")
1444     assert(line_indicates_trait_regex.match("   uintptr_t (*send_data)(void *this_arg, LDKu8slice data, bool resume_read);"))
1445     assert(line_indicates_trait_regex.match("   LDKCVec_MessageSendEventZ (*get_and_clear_pending_msg_events)(const void *this_arg);"))
1446     assert(line_indicates_trait_regex.match("   void *(*clone)(const void *this_arg);"))
1447     line_field_var_regex = re.compile("^   ([A-Za-z_0-9]*) ([A-Za-z_0-9]*);$")
1448     assert(line_field_var_regex.match("   LDKMessageSendEventsProvider MessageSendEventsProvider;"))
1449     struct_name_regex = re.compile("^typedef (struct|enum|union) (MUST_USE_STRUCT )?(LDK[A-Za-z_0-9]*) {$")
1450     assert(struct_name_regex.match("typedef struct LDKCVecTempl_u8 {"))
1451     assert(struct_name_regex.match("typedef enum LDKNetwork {"))
1452     struct_alias_regex = re.compile("^typedef (LDK[A-Za-z_0-9]*) (LDK[A-Za-z_0-9]*);$")
1453     assert(struct_alias_regex.match("typedef LDKCResultTempl_bool__PeerHandleError LDKCResult_boolPeerHandleErrorZ;"))
1454
1455     result_templ_structs = set()
1456     union_enum_items = {}
1457     result_ptr_struct_items = {}
1458     for line in in_h:
1459         if in_block_comment:
1460             if line.endswith("*/\n"):
1461                 in_block_comment = False
1462         elif cur_block_obj is not None:
1463             cur_block_obj  = cur_block_obj + line
1464             if line.startswith("} "):
1465                 field_lines = []
1466                 struct_name = None
1467                 vec_ty = None
1468                 obj_lines = cur_block_obj.split("\n")
1469                 is_opaque = False
1470                 result_contents = None
1471                 is_unitary_enum = False
1472                 is_union_enum = False
1473                 is_union = False
1474                 is_tuple = False
1475                 trait_fn_lines = []
1476                 field_var_lines = []
1477
1478                 for idx, struct_line in enumerate(obj_lines):
1479                     if struct_line.strip().startswith("/*"):
1480                         in_block_comment = True
1481                     if in_block_comment:
1482                         if struct_line.endswith("*/"):
1483                             in_block_comment = False
1484                     else:
1485                         struct_name_match = struct_name_regex.match(struct_line)
1486                         if struct_name_match is not None:
1487                             struct_name = struct_name_match.group(3)
1488                             if struct_name_match.group(1) == "enum":
1489                                 if not struct_name.endswith("_Tag"):
1490                                     is_unitary_enum = True
1491                                 else:
1492                                     is_union_enum = True
1493                             elif struct_name_match.group(1) == "union":
1494                                 is_union = True
1495                         if line_indicates_opaque_regex.match(struct_line):
1496                             is_opaque = True
1497                         result_match = line_indicates_result_regex.match(struct_line)
1498                         if result_match is not None:
1499                             result_contents = result_match.group(1)
1500                         vec_ty_match = line_indicates_vec_regex.match(struct_line)
1501                         if vec_ty_match is not None and struct_name.startswith("LDKCVecTempl_"):
1502                             vec_ty = vec_ty_match.group(1)
1503                         elif struct_name.startswith("LDKC2TupleTempl_") or struct_name.startswith("LDKC3TupleTempl_"):
1504                             is_tuple = True
1505                         trait_fn_match = line_indicates_trait_regex.match(struct_line)
1506                         if trait_fn_match is not None:
1507                             trait_fn_lines.append(trait_fn_match)
1508                         field_var_match = line_field_var_regex.match(struct_line)
1509                         if field_var_match is not None:
1510                             field_var_lines.append(field_var_match)
1511                         field_lines.append(struct_line)
1512
1513                 assert(struct_name is not None)
1514                 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))
1515                 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))
1516                 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))
1517                 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))
1518                 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))
1519                 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))
1520                 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))
1521
1522                 if is_opaque:
1523                     opaque_structs.add(struct_name)
1524                     with open(sys.argv[3] + "/structs/" + struct_name.replace("LDK","") + ".java", "w") as out_java_struct:
1525                         out_java_struct.write(hu_struct_file_prefix)
1526                         out_java_struct.write("public class " + struct_name.replace("LDK","") + " extends CommonBase")
1527                         if struct_name.startswith("LDKLocked"):
1528                             out_java_struct.write(" implements AutoCloseable")
1529                         out_java_struct.write(" {\n")
1530                         out_java_struct.write("\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); }\n")
1531                         if struct_name.startswith("LDKLocked"):
1532                             out_java_struct.write("\t@Override public void close() {\n")
1533                         else:
1534                             out_java_struct.write("\t@Override @SuppressWarnings(\"deprecation\")\n")
1535                             out_java_struct.write("\tprotected void finalize() throws Throwable {\n")
1536                             out_java_struct.write("\t\tsuper.finalize();\n")
1537                         out_java_struct.write("\t\tbindings." + struct_name.replace("LDK","") + "_free(ptr);\n")
1538                         out_java_struct.write("\t}\n\n")
1539                 elif result_contents is not None:
1540                     result_templ_structs.add(struct_name)
1541                     assert result_contents in result_ptr_struct_items
1542                 elif struct_name.startswith("LDKCResultPtr_"):
1543                     for line in field_lines:
1544                         if line.endswith("*result;"):
1545                             res_ty = line[:-8].strip()
1546                         elif line.endswith("*err;"):
1547                             err_ty = line[:-5].strip()
1548                     result_ptr_struct_items[struct_name] = (res_ty, err_ty)
1549                 elif is_tuple:
1550                     out_java.write("\tpublic static native long " + struct_name + "_new(")
1551                     out_c.write("JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1new(JNIEnv *_env, jclass _b")
1552                     ty_list = []
1553                     for idx, line in enumerate(field_lines):
1554                         if idx != 0 and idx < len(field_lines) - 2:
1555                             ty_info = java_c_types(line.strip(';'), None)
1556                             if idx != 1:
1557                                 out_java.write(", ")
1558                             e = chr(ord('a') + idx - 1)
1559                             out_java.write(ty_info.java_ty + " " + e)
1560                             out_c.write(", " + ty_info.c_ty + " " + e)
1561                             ty_list.append(ty_info)
1562                     tuple_types[struct_name] = (ty_list, struct_name)
1563                     out_java.write(");\n")
1564                     out_c.write(") {\n")
1565                     out_c.write("\t" + struct_name + "* ret = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n")
1566                     for idx, line in enumerate(field_lines):
1567                         if idx != 0 and idx < len(field_lines) - 2:
1568                             ty_info = map_type(line.strip(';'), False, None, False)
1569                             e = chr(ord('a') + idx - 1)
1570                             if ty_info.arg_conv is not None:
1571                                 out_c.write("\t" + ty_info.arg_conv.replace("\n", "\n\t"))
1572                                 out_c.write("\n\tret->" + e + " = " + ty_info.arg_conv_name + ";\n")
1573                             else:
1574                                 out_c.write("\tret->" + e + " = " + e + ";\n")
1575                             if ty_info.arg_conv_cleanup is not None:
1576                                 out_c.write("\t//TODO: Really need to call " + ty_info.arg_conv_cleanup + " here\n")
1577                     out_c.write("\treturn (long)ret;\n")
1578                     out_c.write("}\n")
1579                 elif vec_ty is not None:
1580                     if vec_ty in opaque_structs:
1581                         out_java.write("\tpublic static native long[] " + struct_name + "_arr_info(long vec_ptr);\n")
1582                         out_c.write("JNIEXPORT jlongArray JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1arr_1info(JNIEnv *env, jclass _b, jlong ptr) {\n")
1583                     else:
1584                         out_java.write("\tpublic static native VecOrSliceDef " + struct_name + "_arr_info(long vec_ptr);\n")
1585                         out_c.write("JNIEXPORT jobject JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1arr_1info(JNIEnv *env, jclass _b, jlong ptr) {\n")
1586                     out_c.write("\t" + struct_name + " *vec = (" + struct_name + "*)ptr;\n")
1587                     if vec_ty in opaque_structs:
1588                         out_c.write("\tjlongArray ret = (*env)->NewLongArray(env, vec->datalen);\n")
1589                         out_c.write("\tjlong *ret_elems = (*env)->GetPrimitiveArrayCritical(env, ret, NULL);\n")
1590                         out_c.write("\tfor (size_t i = 0; i < vec->datalen; i++) {\n")
1591                         out_c.write("\t\tCHECK((((long)vec->data[i].inner) & 1) == 0);\n")
1592                         out_c.write("\t\tret_elems[i] = (long)vec->data[i].inner | (vec->data[i].is_owned ? 1 : 0);\n")
1593                         out_c.write("\t}\n")
1594                         out_c.write("\t(*env)->ReleasePrimitiveArrayCritical(env, ret, ret_elems, 0);\n")
1595                         out_c.write("\treturn ret;\n")
1596                     else:
1597                         out_c.write("\treturn (*env)->NewObject(env, slicedef_cls, slicedef_meth, (long)vec->data, (long)vec->datalen, sizeof(" + vec_ty + "));\n")
1598                     out_c.write("}\n")
1599
1600                     ty_info = map_type(vec_ty + " arr_elem", False, None, False)
1601                     if len(ty_info.java_fn_ty_arg) == 1: # ie we're a primitive of some form
1602                         out_java.write("\tpublic static native long " + struct_name + "_new(" + ty_info.java_ty + "[] elems);\n")
1603                         out_c.write("JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1new(JNIEnv *env, jclass _b, j" + ty_info.java_ty + "Array elems){\n")
1604                         out_c.write("\t" + struct_name + " *ret = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n")
1605                         out_c.write("\tret->datalen = (*env)->GetArrayLength(env, elems);\n")
1606                         out_c.write("\tif (ret->datalen == 0) {\n")
1607                         out_c.write("\t\tret->data = NULL;\n")
1608                         out_c.write("\t} else {\n")
1609                         out_c.write("\t\tret->data = MALLOC(sizeof(" + vec_ty + ") * ret->datalen, \"" + struct_name + " Data\");\n")
1610                         out_c.write("\t\t" + ty_info.c_ty + " *java_elems = (*env)->GetPrimitiveArrayCritical(env, elems, NULL);\n")
1611                         out_c.write("\t\tfor (size_t i = 0; i < ret->datalen; i++) {\n")
1612                         if ty_info.arg_conv is not None:
1613                             out_c.write("\t\t\t" + ty_info.c_ty + " arr_elem = java_elems[i];\n")
1614                             out_c.write("\t\t\t" + ty_info.arg_conv.replace("\n", "\n\t\t\t") + "\n")
1615                             out_c.write("\t\t\tret->data[i] = " + ty_info.arg_conv_name + ";\n")
1616                             assert ty_info.arg_conv_cleanup is None
1617                         else:
1618                             out_c.write("\t\t\tret->data[i] = java_elems[i];\n")
1619                         out_c.write("\t\t}\n")
1620                         out_c.write("\t\t(*env)->ReleasePrimitiveArrayCritical(env, elems, java_elems, 0);\n")
1621                         out_c.write("\t}\n")
1622                         out_c.write("\treturn (long)ret;\n")
1623                         out_c.write("}\n")
1624                 elif is_union_enum:
1625                     assert(struct_name.endswith("_Tag"))
1626                     struct_name = struct_name[:-4]
1627                     union_enum_items[struct_name] = {"field_lines": field_lines}
1628                 elif struct_name.endswith("_Body") and struct_name.split("_")[0] in union_enum_items:
1629                     enum_var_name = struct_name.split("_")
1630                     union_enum_items[enum_var_name[0]][enum_var_name[1]] = field_lines
1631                 elif struct_name in union_enum_items:
1632                     map_complex_enum(struct_name, union_enum_items[struct_name])
1633                 elif is_unitary_enum:
1634                     map_unitary_enum(struct_name, field_lines)
1635                 elif len(trait_fn_lines) > 0:
1636                     trait_structs.add(struct_name)
1637                     map_trait(struct_name, field_var_lines, trait_fn_lines)
1638                 elif struct_name == "LDKTxOut":
1639                     with open(sys.argv[3] + "/structs/TxOut.java", "w") as out_java_struct:
1640                         out_java_struct.write(hu_struct_file_prefix)
1641                         out_java_struct.write("public class TxOut extends CommonBase{\n")
1642                         out_java_struct.write("\tTxOut(java.lang.Object _dummy, long ptr) { super(ptr); }\n")
1643                         # TODO: TxOut body
1644                         out_java_struct.write("}")
1645                 elif struct_name == "LDKTransaction":
1646                     with open(sys.argv[3] + "/structs/Transaction.java", "w") as out_java_struct:
1647                         out_java_struct.write(hu_struct_file_prefix)
1648                         out_java_struct.write("public class Transaction extends CommonBase{\n")
1649                         out_java_struct.write("\tTransaction(java.lang.Object _dummy, long ptr) { super(ptr); }\n")
1650                         # TODO: Transaction body
1651                         out_java_struct.write("}")
1652                 else:
1653                     pass # Everything remaining is a byte[] or some form
1654                 cur_block_obj = None
1655         else:
1656             fn_ptr = fn_ptr_regex.match(line)
1657             fn_ret_arr = fn_ret_arr_regex.match(line)
1658             reg_fn = reg_fn_regex.match(line)
1659             const_val = const_val_regex.match(line)
1660
1661             if line.startswith("#include <"):
1662                 pass
1663             elif line.startswith("/*"):
1664                 #out_java.write("\t" + line)
1665                 if not line.endswith("*/\n"):
1666                     in_block_comment = True
1667             elif line.startswith("typedef enum "):
1668                 cur_block_obj = line
1669             elif line.startswith("typedef struct "):
1670                 cur_block_obj = line
1671             elif line.startswith("typedef union "):
1672                 cur_block_obj = line
1673             elif line.startswith("typedef "):
1674                 alias_match =  struct_alias_regex.match(line)
1675                 if alias_match.group(1) in tuple_types:
1676                     tuple_types[alias_match.group(2)] = (tuple_types[alias_match.group(1)][0], alias_match.group(2))
1677                     tuple_types[alias_match.group(1)] = (tuple_types[alias_match.group(1)][0], alias_match.group(2))
1678                     for idx, ty_info in enumerate(tuple_types[alias_match.group(1)][0]):
1679                         e = chr(ord('a') + idx)
1680                         out_java.write("\tpublic static native " + ty_info.java_ty + " " + alias_match.group(2) + "_get_" + e + "(long ptr);\n")
1681                         # XXX: Write C method!
1682                 elif alias_match.group(1) in result_templ_structs:
1683                     human_ty = alias_match.group(2).replace("LDKCResult", "Result_").replace("__", "_").replace("Templ", "")
1684                     with open(sys.argv[3] + "/structs/" + human_ty + ".java", "w") as out_java_struct:
1685                         out_java_struct.write(hu_struct_file_prefix)
1686                         out_java_struct.write("public class " + human_ty + " extends CommonBase {\n")
1687                         out_java_struct.write("\tprivate " + human_ty + "(Object _dummy, long ptr) { super(ptr); }\n")
1688                         out_java_struct.write("\tprotected void finalize() throws Throwable {\n")
1689                         out_java_struct.write("\t\tbindings." + alias_match.group(2).replace("LDK","") + "_free(ptr); super.finalize();\n")
1690                         out_java_struct.write("\t}\n\n")
1691
1692                         contents_ty = alias_match.group(1).replace("LDKCResultTempl", "LDKCResultPtr")
1693                         res_ty, err_ty = result_ptr_struct_items[contents_ty]
1694                         res_map = map_type(res_ty + " res", True, None, False)
1695                         err_map = map_type(err_ty + " err", True, None, False)
1696
1697                         out_java.write("\tpublic static native boolean " + alias_match.group(2) + "_result_ok(long arg);\n")
1698                         out_c.write("JNIEXPORT jboolean JNICALL Java_org_ldk_impl_bindings_" + alias_match.group(2).replace("_", "_1") + "_1result_1ok (JNIEnv * env, jclass _a, jlong arg) {\n")
1699                         out_c.write("\treturn ((" + alias_match.group(2) + "*)arg)->result_ok;\n")
1700                         out_c.write("}\n")
1701
1702                         out_java.write("\tpublic static native " + res_map.java_ty + " " + alias_match.group(2) + "_get_ok(long arg);\n")
1703                         out_c.write("JNIEXPORT " + res_map.c_ty + " JNICALL Java_org_ldk_impl_bindings_" + alias_match.group(2).replace("_", "_1") + "_1get_1ok (JNIEnv * _env, jclass _a, jlong arg) {\n")
1704                         out_c.write("\t" + alias_match.group(2) + " *val = (" + alias_match.group(2) + "*)arg;\n")
1705                         out_c.write("\tCHECK(val->result_ok);\n\t")
1706                         out_java_struct.write("\tpublic static final class " + human_ty + "_OK extends " + human_ty + " {\n")
1707                         if res_map.ret_conv is not None:
1708                             out_c.write(res_map.ret_conv[0].replace("\n", "\n\t") + "(*val->contents.result)")
1709                             out_c.write(res_map.ret_conv[1].replace("\n", "\n\t") + "\n\treturn " + res_map.ret_conv_name)
1710                         else:
1711                             out_c.write("return *val->contents.result")
1712                         out_c.write(";\n}\n")
1713
1714                         out_java_struct.write("\t\tpublic " + res_map.java_hu_ty + " res;\n")
1715                         out_java_struct.write("\t\tprivate " + human_ty + "_OK(Object _dummy, long ptr) {\n")
1716                         out_java_struct.write("\t\t\tsuper(_dummy, ptr);\n")
1717                         if res_map.to_hu_conv is not None:
1718                             out_java_struct.write("\t\t\t" + res_map.java_ty + " res = bindings." + alias_match.group(2) + "_get_ok(ptr);\n")
1719                             out_java_struct.write("\t\t\t" + res_map.to_hu_conv.replace("\n", "\n\t\t\t"))
1720                             out_java_struct.write("\n\t\t\tthis.res = " + res_map.to_hu_conv_name + ";\n")
1721                         else:
1722                             out_java_struct.write("\t\t\tthis.res = bindings." + alias_match.group(2) + "_get_ok(ptr);\n")
1723                         out_java_struct.write("\t\t}\n\n")
1724
1725                         out_java.write("\tpublic static native " + err_map.java_ty + " " + alias_match.group(2) + "_get_err(long arg);\n")
1726                         out_c.write("JNIEXPORT " + err_map.c_ty + " JNICALL Java_org_ldk_impl_bindings_" + alias_match.group(2).replace("_", "_1") + "_1get_1err (JNIEnv * _env, jclass _a, jlong arg) {\n")
1727                         out_c.write("\t" + alias_match.group(2) + " *val = (" + alias_match.group(2) + "*)arg;\n")
1728                         out_c.write("\tCHECK(!val->result_ok);\n\t")
1729                         out_java_struct.write("\t}\n\tpublic static final class " + human_ty + "_Err extends " + human_ty + " {\n")
1730                         if err_map.ret_conv is not None:
1731                             out_c.write(err_map.ret_conv[0].replace("\n", "\n\t") + "(*val->contents.err)")
1732                             out_c.write(err_map.ret_conv[1].replace("\n", "\n\t") + "\n\treturn " + err_map.ret_conv_name)
1733                         else:
1734                             out_c.write("return *val->contents.err")
1735                         out_c.write(";\n}\n")
1736
1737                         out_java_struct.write("\t\tpublic " + err_map.java_hu_ty + " err;\n")
1738                         out_java_struct.write("\t\tprivate " + human_ty + "_Err(Object _dummy, long ptr) {\n")
1739                         out_java_struct.write("\t\t\tsuper(_dummy, ptr);\n")
1740                         if err_map.to_hu_conv is not None:
1741                             out_java_struct.write("\t\t\t" + err_map.java_ty + " err = bindings." + alias_match.group(2) + "_get_err(ptr);\n")
1742                             out_java_struct.write("\t\t\t" + err_map.to_hu_conv.replace("\n", "\n\t\t\t"))
1743                             out_java_struct.write("\n\t\t\tthis.err = " + err_map.to_hu_conv_name + ";\n")
1744                         else:
1745                             out_java_struct.write("\t\t\tthis.err = bindings." + alias_match.group(2) + "_get_err(ptr);\n")
1746                         out_java_struct.write("\t\t}\n\t}\n}\n")
1747             elif fn_ptr is not None:
1748                 map_fn(line, fn_ptr, None, None)
1749             elif fn_ret_arr is not None:
1750                 map_fn(line, fn_ret_arr, fn_ret_arr.group(4), None)
1751             elif reg_fn is not None:
1752                 map_fn(line, reg_fn, None, None)
1753             elif const_val_regex is not None:
1754                 # TODO Map const variables
1755                 pass
1756             else:
1757                 assert(line == "\n")
1758
1759     out_java.write("}\n")
1760     for struct_name in opaque_structs:
1761         with open(sys.argv[3] + "/structs/" + struct_name.replace("LDK","") + ".java", "a") as out_java_struct:
1762             out_java_struct.write("}\n")
1763     for struct_name in trait_structs:
1764         with open(sys.argv[3] + "/structs/" + struct_name.replace("LDK","") + ".java", "a") as out_java_struct:
1765             out_java_struct.write("}\n")