_ 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, holds_ref):
 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, holds_ref)
 367
 368     def map_type_with_info(ty_info, print_void, ret_arr_len, is_free, holds_ref):
 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                     if not holds_ref and ty_info.rust_obj == "LDKCVec_u8Z":
 393                         ret_conv = (ret_conv[0], ret_conv[1] + "\nCVec_u8Z_free(" + arr_name + "_var);")
 394                 elif ty_info.rust_obj is not None:
 395                     arg_conv = ty_info.rust_obj + " " + arr_name + "_ref;\n"
 396                     arg_conv = arg_conv + "CHECK((*_env)->GetArrayLength (_env, " + arr_name + ") == " + arr_len + ");\n"
 397                     arg_conv = arg_conv + "(*_env)->GetByteArrayRegion (_env, " + arr_name + ", 0, " + arr_len + ", " + arr_name + "_ref." + ty_info.arr_access + ");"
 398                     ret_conv = (ret_conv[0], "." + ty_info.arr_access + ");")
 399                 else:
 400                     arg_conv = "unsigned char " + arr_name + "_arr[" + arr_len + "];\n"
 401                     arg_conv = arg_conv + "CHECK((*_env)->GetArrayLength (_env, " + arr_name + ") == " + arr_len + ");\n"
 402                     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;"
 403                     ret_conv = (ret_conv[0] + "*", ");")
 404                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 405                     arg_conv = arg_conv, arg_conv_name = arr_name + "_ref", arg_conv_cleanup = arg_conv_cleanup,
 406                     ret_conv = ret_conv, ret_conv_name = arr_name + "_arr", to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 407             else:
 408                 assert not arr_len.isdigit() # fixed length arrays not implemented
 409                 assert ty_info.java_ty[len(ty_info.java_ty) - 2:] == "[]"
 410                 conv_name = "arr_conv_" + str(len(ty_info.java_hu_ty))
 411                 idxc = chr(ord('a') + (len(ty_info.java_hu_ty) % 26))
 412                 ty_info.subty.var_name = conv_name
 413                 subty = map_type_with_info(ty_info.subty, False, None, is_free, holds_ref)
 414                 if arr_name == "":
 415                     arr_name = "arg"
 416                 arg_conv = ty_info.rust_obj + " " + arr_name + "_constr;\n"
 417                 arg_conv = arg_conv + arr_name + "_constr." + arr_len + " = (*_env)->GetArrayLength (_env, " + arr_name + ");\n"
 418                 arg_conv = arg_conv + "if (" + arr_name + "_constr." + arr_len + " > 0)\n"
 419                 if subty.rust_obj is None:
 420                     szof = subty.c_ty
 421                 else:
 422                     szof = subty.rust_obj
 423                 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"
 424                 arg_conv = arg_conv + "else\n"
 425                 arg_conv = arg_conv + "\t" + arr_name + "_constr." + ty_info.arr_access + " = NULL;\n"
 426                 if not ty_info.java_ty[:len(ty_info.java_ty) - 2].endswith("[]"):
 427                     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"
 428                 arg_conv = arg_conv + "for (size_t " + idxc + " = 0; " + idxc + " < " + arr_name + "_constr." + arr_len + "; " + idxc + "++) {\n"
 429                 if not ty_info.java_ty[:len(ty_info.java_ty) - 2].endswith("[]"):
 430                     arg_conv = arg_conv + "\t" + ty_info.java_ty.strip("[]") + " " + conv_name + " = " + arr_name + "_vals[" + idxc + "];"
 431                     if subty.arg_conv is not None:
 432                         arg_conv = arg_conv + "\n\t" + subty.arg_conv.replace("\n", "\n\t")
 433                 else:
 434                     arg_conv = arg_conv + "\tjobject " + conv_name + " = (*_env)->GetObjectArrayElement(_env, " + arr_name + ", " + idxc + ");\n"
 435                     arg_conv = arg_conv + "\t" + subty.arg_conv.replace("\n", "\n\t")
 436                 arg_conv = arg_conv + "\n\t" + arr_name + "_constr." + ty_info.arr_access + "[" + idxc + "] = " + subty.arg_conv_name + ";\n}"
 437                 if not ty_info.java_ty[:len(ty_info.java_ty) - 2].endswith("[]"):
 438                     arg_conv = arg_conv + "\n(*_env)->Release" + ty_info.java_ty.strip("[]").title() + "ArrayElements (_env, " + arr_name + ", " + arr_name + "_vals, 0);"
 439                 if ty_info.is_ptr:
 440                     arg_conv_name = "&" + arr_name + "_constr"
 441                 else:
 442                     arg_conv_name = arr_name + "_constr"
 443                 arg_conv_cleanup = None
 444                 if ty_info.is_ptr:
 445                     arg_conv_cleanup = "FREE(" + arr_name + "_constr." + ty_info.arr_access + ");"
 446
 447                 if arr_name == "arg":
 448                     arr_name = "ret"
 449                 ret_conv = (ty_info.rust_obj + " " + arr_name + "_var = ", "")
 450                 if subty.ret_conv is None:
 451                     ret_conv = ("DUMMY", "DUMMY")
 452                 elif not ty_info.java_ty[:len(ty_info.java_ty) - 2].endswith("[]"):
 453                     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")
 454                     ret_conv = (ret_conv[0], ret_conv[1] + subty.c_ty + " *" + arr_name + "_arr_ptr = (*_env)->GetPrimitiveArrayCritical(_env, " + arr_name + "_arr, NULL);\n")
 455                     ret_conv = (ret_conv[0], ret_conv[1] + "for (size_t " + idxc + " = 0; " + idxc + " < " + arr_name + "_var." + arr_len + "; " + idxc + "++) {\n")
 456                     ret_conv = (ret_conv[0], ret_conv[1] + "\t" + subty.ret_conv[0].replace("\n", "\n\t"))
 457                     ret_conv = (ret_conv[0], ret_conv[1] + arr_name + "_var." + ty_info.arr_access + "[" + idxc + "]" + subty.ret_conv[1].replace("\n", "\n\t"))
 458                     ret_conv = (ret_conv[0], ret_conv[1] + "\n\t" + arr_name + "_arr_ptr[" + idxc + "] = " + subty.ret_conv_name + ";\n")
 459                     ret_conv = (ret_conv[0], ret_conv[1] + "}\n(*_env)->ReleasePrimitiveArrayCritical(_env, " + arr_name + "_arr, " + arr_name + "_arr_ptr, 0);")
 460                 else:
 461                     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!
 462                     ret_conv = (ret_conv[0], ret_conv[1] + "for (size_t " + idxc + " = 0; " + idxc + " < " + arr_name + "_var." + arr_len + "; " + idxc + "++) {\n")
 463                     ret_conv = (ret_conv[0], ret_conv[1] + "\t" + subty.ret_conv[0].replace("\n", "\n\t"))
 464                     ret_conv = (ret_conv[0], ret_conv[1] + arr_name + "_var." + ty_info.arr_access + "[" + idxc + "]" + subty.ret_conv[1].replace("\n", "\n\t"))
 465                     ret_conv = (ret_conv[0], ret_conv[1] + "\n\t(*_env)->SetObjectArrayElement(_env, " + arr_name + "_arr, " + idxc + ", " + subty.ret_conv_name + ");\n")
 466                     ret_conv = (ret_conv[0], ret_conv[1] + "}")
 467                 if not holds_ref:
 468                     if subty.rust_obj is not None and subty.rust_obj in opaque_structs:
 469                         ret_conv = (ret_conv[0], ret_conv[1] + "\nFREE(" + arr_name + "_var." + ty_info.arr_access + ");")
 470                     else:
 471                         ret_conv = (ret_conv[0], ret_conv[1] + "\n" + ty_info.rust_obj.replace("LDK", "") + "_free(" + arr_name + "_var);")
 472
 473                 to_hu_conv = None
 474                 to_hu_conv_name = None
 475                 if subty.to_hu_conv is not None:
 476                     to_hu_conv = ty_info.java_hu_ty + " " + conv_name + "_arr = new " + ty_info.subty.java_hu_ty.split("<")[0] + "[" + arr_name + ".length];\n"
 477                     to_hu_conv = to_hu_conv + "for (int " + idxc + " = 0; " + idxc + " < " + arr_name + ".length; " + idxc + "++) {\n"
 478                     to_hu_conv = to_hu_conv + "\t" + subty.java_ty + " " + conv_name + " = " + arr_name + "[" + idxc + "];\n"
 479                     to_hu_conv = to_hu_conv + "\t" + subty.to_hu_conv.replace("\n", "\n\t") + "\n"
 480                     to_hu_conv = to_hu_conv + "\t" + conv_name + "_arr[" + idxc + "] = " + subty.to_hu_conv_name + ";\n}"
 481                     to_hu_conv_name = conv_name + "_arr"
 482                 from_hu_conv = None
 483                 if subty.from_hu_conv is not None:
 484                     if subty.java_ty == "long" and subty.java_hu_ty != "long":
 485                         from_hu_conv = ("Arrays.stream(" + arr_name + ").mapToLong(" + conv_name + " -> " + subty.from_hu_conv[0] + ").toArray()", "/* TODO 2 " + subty.java_hu_ty + "  */")
 486                     elif subty.java_ty == "long":
 487                         from_hu_conv = ("Arrays.stream(" + arr_name + ").map(" + conv_name + " -> " + subty.from_hu_conv[0] + ").toArray()", "/* TODO 2 " + subty.java_hu_ty + "  */")
 488                     else:
 489                         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 + "  */")
 490
 491                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 492                     arg_conv = arg_conv, arg_conv_name = arg_conv_name, arg_conv_cleanup = arg_conv_cleanup,
 493                     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)
 494         elif ty_info.java_ty == "String":
 495             if ty_info.arr_access is None:
 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 = ("jstring " + ty_info.var_name + "_conv = (*_env)->NewStringUTF(_env, ", ");"), ret_conv_name = ty_info.var_name + "_conv",
 499                     to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 500             else:
 501                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 502                     arg_conv = None, arg_conv_name = None, arg_conv_cleanup = None,
 503                     ret_conv = ("LDKStr " + ty_info.var_name + "_str = ",
 504                         ";\nchar* " + ty_info.var_name + "_buf = MALLOC(" + ty_info.var_name + "_str." + ty_info.arr_len + " + 1, \"str conv buf\");\n" +
 505                         "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" +
 506                         ty_info.var_name + "_buf[" + ty_info.var_name + "_str." + ty_info.arr_len + "] = 0;\n" +
 507                         "jstring " + ty_info.var_name + "_conv = (*_env)->NewStringUTF(_env, " + ty_info.var_name + "_str." + ty_info.arr_access + ");\n" +
 508                         "FREE(" + ty_info.var_name + "_buf);"),
 509                     ret_conv_name = ty_info.var_name + "_conv", to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 510         elif ty_info.var_name != "":
 511             # If we have a parameter name, print it (noting that it may indicate its a pointer)
 512             if ty_info.rust_obj is not None:
 513                 assert(ty_info.passed_as_ptr)
 514                 opaque_arg_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv;\n"
 515                 opaque_arg_conv = opaque_arg_conv + ty_info.var_name + "_conv.inner = (void*)(" + ty_info.var_name + " & (~1));\n"
 516                 opaque_arg_conv = opaque_arg_conv + ty_info.var_name + "_conv.is_owned = (" + ty_info.var_name + " & 1) || (" + ty_info.var_name + " == 0);"
 517                 if not ty_info.is_ptr and not is_free and not ty_info.pass_by_ref:
 518                     if (ty_info.java_hu_ty + "_clone") in clone_fns:
 519                         # 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.
 520                         opaque_arg_conv = opaque_arg_conv + "\nif (" + ty_info.var_name + "_conv.inner != NULL)\n"
 521                         opaque_arg_conv = opaque_arg_conv + "\t" + ty_info.var_name + "_conv = " + ty_info.java_hu_ty + "_clone(&" + ty_info.var_name + "_conv);"
 522                     elif ty_info.passed_as_ptr:
 523                         opaque_arg_conv = opaque_arg_conv + "\n// Warning: we may need a move here but can't clone!"
 524                 if not ty_info.is_ptr:
 525                     if ty_info.rust_obj in unitary_enums:
 526                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 527                             arg_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv = " + ty_info.rust_obj + "_from_java(_env, " + ty_info.var_name + ");",
 528                             arg_conv_name = ty_info.var_name + "_conv",
 529                             arg_conv_cleanup = None,
 530                             ret_conv = ("jclass " + ty_info.var_name + "_conv = " + ty_info.rust_obj + "_to_java(_env, ", ");"),
 531                             ret_conv_name = ty_info.var_name + "_conv", to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 532                     if ty_info.rust_obj in opaque_structs:
 533                         ret_conv_suf = ";\nCHECK((((long)" + ty_info.var_name + "_var.inner) & 1) == 0); // We rely on a free low bit, malloc guarantees this.\n"
 534                         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"
 535                         if holds_ref:
 536                             ret_conv_suf = ret_conv_suf + "long " + ty_info.var_name + "_ref = (long)" + ty_info.var_name + "_var.inner & ~1;"
 537                         else:
 538                             ret_conv_suf = ret_conv_suf + "long " + ty_info.var_name + "_ref;\n"
 539                             ret_conv_suf = ret_conv_suf + "if (" + ty_info.var_name + "_var.is_owned) {\n"
 540                             ret_conv_suf = ret_conv_suf + "\t" + ty_info.var_name + "_ref = (long)" + ty_info.var_name + "_var.inner | 1;\n"
 541                             ret_conv_suf = ret_conv_suf + "} else {\n"
 542                             ret_conv_suf = ret_conv_suf + "\t" + ty_info.var_name + "_ref = (long)" + ty_info.var_name + "_var.inner & ~1;\n"
 543                             ret_conv_suf = ret_conv_suf + "}"
 544                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 545                             arg_conv = opaque_arg_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 546                             ret_conv = (ty_info.rust_obj + " " + ty_info.var_name + "_var = ", ret_conv_suf),
 547                             ret_conv_name = ty_info.var_name + "_ref",
 548                             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 + ");",
 549                             to_hu_conv_name = ty_info.var_name + "_hu_conv",
 550                             from_hu_conv = (ty_info.var_name + " == null ? 0 : " + ty_info.var_name + ".ptr & ~1", "this.ptrs_to.add(" + ty_info.var_name + ")"))
 551                     base_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv = *(" + ty_info.rust_obj + "*)" + ty_info.var_name + ";";
 552                     if ty_info.rust_obj in trait_structs:
 553                         if not is_free:
 554                             base_conv = base_conv + "\nif (" + ty_info.var_name + "_conv.free == " + ty_info.rust_obj + "_JCalls_free) {\n"
 555                             base_conv = base_conv + "\t// If this_arg is a JCalls struct, then we need to increment the refcnt in it.\n"
 556                             base_conv = base_conv + "\t" + ty_info.rust_obj + "_JCalls_clone(" + ty_info.var_name + "_conv.this_arg);\n}"
 557                         else:
 558                             base_conv = base_conv + "\n" + "FREE((void*)" + ty_info.var_name + ");"
 559                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 560                             arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 561                             ret_conv = ("CANT PASS TRAIT TO Java?", ""), ret_conv_name = "NO CONV POSSIBLE",
 562                             to_hu_conv = "DUMMY", to_hu_conv_name = None,
 563                             from_hu_conv = (ty_info.var_name + " == null ? 0 : " + ty_info.var_name + ".ptr", "this.ptrs_to.add(" + ty_info.var_name + ")"))
 564                     if ty_info.rust_obj != "LDKu8slice":
 565                         # Don't bother free'ing slices passed in - Rust doesn't auto-free the
 566                         # underlying unlike Vecs, and it gives Java more freedom.
 567                         base_conv = base_conv + "\nFREE((void*)" + ty_info.var_name + ");";
 568                     if ty_info.rust_obj in complex_enums:
 569                         ret_conv = ("long " + ty_info.var_name + "_ref = (long)&", ";")
 570                         if not ty_info.is_ptr and not holds_ref and (ty_info.java_hu_ty + "_clone") in clone_fns:
 571                             ret_conv = (ty_info.rust_obj + " *" + ty_info.var_name + "_copy = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n", "")
 572                             ret_conv = (ret_conv[0] + "*" + ty_info.var_name + "_copy = " + ty_info.java_hu_ty + "_clone(&", ");\n")
 573                             ret_conv = (ret_conv[0], ret_conv[1] + "long " + ty_info.var_name + "_ref = (long)" + ty_info.var_name + "_copy;")
 574                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 575                             arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 576                             ret_conv = ret_conv, ret_conv_name = ty_info.var_name + "_ref",
 577                             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 + ");",
 578                             to_hu_conv_name = ty_info.var_name + "_hu_conv", from_hu_conv = (ty_info.var_name + ".conv_to_c()", ""))
 579                     if ty_info.rust_obj in tuple_types:
 580                         to_hu_conv_pfx = ""
 581                         to_hu_conv_sfx = ty_info.java_hu_ty + " " + ty_info.var_name + "_conv = new " + ty_info.java_hu_ty + "("
 582                         for idx, conv in enumerate(tuple_types[ty_info.rust_obj][0]):
 583                             if idx != 0:
 584                                 to_hu_conv_sfx = to_hu_conv_sfx + ", "
 585                             conv.var_name = ty_info.var_name + "_" + chr(idx + ord("a"))
 586                             conv_map = map_type_with_info(conv, False, None, is_free, holds_ref)
 587                             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"
 588                             if conv_map.to_hu_conv is not None:
 589                                 to_hu_conv_pfx = to_hu_conv_pfx + conv_map.to_hu_conv + ";\n"
 590                                 to_hu_conv_sfx = to_hu_conv_sfx + conv_map.to_hu_conv_name;
 591                             else:
 592                                 to_hu_conv_sfx = to_hu_conv_sfx + ty_info.var_name + "_" + chr(idx + ord("a"));
 593                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 594                             arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 595                             ret_conv = ("long " + ty_info.var_name + "_ref = (long)&", ";"), ret_conv_name = ty_info.var_name + "_ref",
 596                             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", ""))
 597
 598                     # The manually-defined types - TxOut and Transaction
 599                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 600                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 601                         ret_conv = ("long " + ty_info.var_name + "_ref = (long)&", ";"), ret_conv_name = ty_info.var_name + "_ref",
 602                         to_hu_conv = ty_info.java_hu_ty + " " + ty_info.var_name + "_conv = new " +ty_info.java_hu_ty + "(null, " + ty_info.var_name + ");",
 603                         to_hu_conv_name = ty_info.var_name + "_conv", from_hu_conv = ("/*TODO 1*/0", ""))
 604                 else:
 605                     assert(not is_free)
 606                     if ty_info.rust_obj in opaque_structs:
 607                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 608                             arg_conv = opaque_arg_conv, arg_conv_name = "&" + ty_info.var_name + "_conv", arg_conv_cleanup = None,
 609                             ret_conv = None, ret_conv_name = None, to_hu_conv = "TODO 2", to_hu_conv_name = None,
 610                             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
 611                     elif ty_info.rust_obj in trait_structs:
 612                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 613                             arg_conv = ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)" + ty_info.var_name + ";",
 614                             arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 615                             ret_conv = None, ret_conv_name = None, to_hu_conv = "TODO 2.5", to_hu_conv_name = None,
 616                             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
 617                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 618                         arg_conv = ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)" + ty_info.var_name + ";",
 619                         arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 620                         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
 621             elif ty_info.is_ptr:
 622                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 623                     arg_conv = None, arg_conv_name = ty_info.var_name, arg_conv_cleanup = None,
 624                     ret_conv = None, ret_conv_name = None, to_hu_conv = "TODO 4", to_hu_conv_name = None, from_hu_conv = None)
 625             else:
 626                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 627                     arg_conv = None, arg_conv_name = ty_info.var_name, arg_conv_cleanup = None,
 628                     ret_conv = None, ret_conv_name = None, to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 629         elif not print_void:
 630             # We don't have a parameter name, and want one, just call it arg
 631             if ty_info.rust_obj is not None:
 632                 assert(not is_free or ty_info.rust_obj not in opaque_structs)
 633                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 634                     arg_conv = ty_info.rust_obj + " arg_conv = *(" + ty_info.rust_obj + "*)arg;\nFREE((void*)arg);",
 635                     arg_conv_name = "arg_conv", arg_conv_cleanup = None,
 636                     ret_conv = None, ret_conv_name = None, to_hu_conv = "TODO 7", to_hu_conv_name = None, from_hu_conv = None)
 637             else:
 638                 assert(not is_free)
 639                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 640                     arg_conv = None, arg_conv_name = "arg", arg_conv_cleanup = None,
 641                     ret_conv = None, ret_conv_name = None, to_hu_conv = "TODO 8", to_hu_conv_name = None, from_hu_conv = None)
 642         else:
 643             # We don't have a parameter name, and don't want one (cause we're returning)
 644             if ty_info.rust_obj is not None:
 645                 if not ty_info.is_ptr:
 646                     if ty_info.rust_obj in unitary_enums:
 647                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 648                             arg_conv = ty_info.rust_obj + " ret_conv = " + ty_info.rust_obj + "_from_java(_env, ret);",
 649                             arg_conv_name = "ret_conv", arg_conv_cleanup = None,
 650                             ret_conv = ("jclass ret = " + ty_info.rust_obj + "_to_java(_env, ", ");"), ret_conv_name = "ret",
 651                             to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 652                     if ty_info.rust_obj in opaque_structs:
 653                         # If we're returning a newly-allocated struct, we don't want Rust to ever
 654                         # free, instead relying on the Java GC to lose the ref. We undo this in
 655                         # any _free function.
 656                         # To avoid any issues, we first assert that the incoming object is non-ref.
 657                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 658                             ret_conv = (ty_info.rust_obj + " ret = ", ";"),
 659                             ret_conv_name = "((long)ret.inner) | (ret.is_owned ? 1 : 0)",
 660                             arg_conv = None, arg_conv_name = None, arg_conv_cleanup = None,
 661                             to_hu_conv = ty_info.java_hu_ty + " ret_hu_conv = new " + ty_info.java_hu_ty + "(null, ret);",
 662                             to_hu_conv_name = "ret_hu_conv", from_hu_conv = None)
 663                     elif ty_info.rust_obj in trait_structs:
 664                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 665                             ret_conv = (ty_info.rust_obj + "* ret = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n*ret = ", ";"),
 666                             ret_conv_name = "(long)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 = (ty_info.rust_obj + "* ret = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n*ret = ", ";"),
 673                             ret_conv_name = "(long)ret",
 674                             arg_conv = None, arg_conv_name = None, arg_conv_cleanup = None,
 675                             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);",
 676                             to_hu_conv_name = "ret_hu_conv", from_hu_conv = None)
 677                 elif ty_info.rust_obj in trait_structs:
 678                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 679                         ret_conv = ("long ret = (long)", ";"), ret_conv_name = "ret",
 680                         arg_conv = None, arg_conv_name = None, arg_conv_cleanup = None,
 681                         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);",
 682                         to_hu_conv_name = "ret_hu_conv", from_hu_conv = None)
 683                 else:
 684                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 685                         ret_conv = ("long ret = (long)", ";"), ret_conv_name = "ret",
 686                         arg_conv = None, arg_conv_name = None, arg_conv_cleanup = None,
 687                         to_hu_conv = "TODO c", to_hu_conv_name = None, from_hu_conv = None)
 688             else:
 689                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 690                     arg_conv = None, arg_conv_name = None, arg_conv_cleanup = None,
 691                     ret_conv = None, ret_conv_name = None,
 692                     to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 693
 694     def map_fn(line, re_match, ret_arr_len, c_call_string):
 695         out_java.write("\t// " + line)
 696         out_java.write("\tpublic static native ")
 697         out_c.write("JNIEXPORT ")
 698
 699         is_free = re_match.group(2).endswith("_free")
 700         struct_meth = re_match.group(2).split("_")[0]
 701
 702         ret_info = map_type(re_match.group(1), True, ret_arr_len, False, False)
 703         ret_info.print_ty()
 704
 705         if ret_info.ret_conv is not None:
 706             ret_conv_pfx, ret_conv_sfx = ret_info.ret_conv
 707
 708         out_java.write(" " + re_match.group(2) + "(")
 709         out_c.write(" JNICALL Java_org_ldk_impl_bindings_" + re_match.group(2).replace('_', '_1') + "(JNIEnv * _env, jclass _b")
 710
 711         arg_names = []
 712         default_constructor_args = {}
 713         takes_self = False
 714         args_known = not ret_info.passed_as_ptr or ret_info.rust_obj in opaque_structs or ret_info.rust_obj in trait_structs
 715         for idx, arg in enumerate(re_match.group(3).split(',')):
 716             if idx != 0:
 717                 out_java.write(", ")
 718             if arg != "void":
 719                 out_c.write(", ")
 720             arg_conv_info = map_type(arg, False, None, is_free, False)
 721             if arg_conv_info.c_ty != "void":
 722                 arg_conv_info.print_ty()
 723                 arg_conv_info.print_name()
 724             if arg_conv_info.arg_name == "this_ptr" or arg_conv_info.arg_name == "this_arg":
 725                 takes_self = True
 726             if arg_conv_info.passed_as_ptr and not arg_conv_info.rust_obj in opaque_structs:
 727                 if not arg_conv_info.rust_obj in trait_structs and not arg_conv_info.rust_obj in unitary_enums:
 728                     args_known = False
 729             if arg_conv_info.arg_conv is not None and "Warning" in arg_conv_info.arg_conv:
 730                 if arg_conv_info.rust_obj in constructor_fns:
 731                     assert not is_free
 732                     for explode_arg in constructor_fns[arg_conv_info.rust_obj].split(','):
 733                         explode_arg_conv = map_type(explode_arg, False, None, False, False)
 734                         if explode_arg_conv.c_ty == "void":
 735                             # We actually want to handle this case, but for now its only used in NetGraphMsgHandler::new()
 736                             # which ends up resulting in a redundant constructor - both without arguments for the NetworkGraph.
 737                             args_known = False
 738                         assert explode_arg_conv.arg_name != "this_ptr"
 739                         assert explode_arg_conv.arg_name != "this_arg"
 740                         if explode_arg_conv.passed_as_ptr and not explode_arg_conv.rust_obj in trait_structs:
 741                             args_known = False
 742                         if not arg_conv_info.arg_name in default_constructor_args:
 743                             default_constructor_args[arg_conv_info.arg_name] = []
 744                         default_constructor_args[arg_conv_info.arg_name].append(explode_arg_conv)
 745                 else:
 746                     args_known = False
 747             arg_names.append(arg_conv_info)
 748
 749         out_java_struct = None
 750         if ("LDK" + struct_meth in opaque_structs or "LDK" + struct_meth in trait_structs) and not is_free:
 751             out_java_struct = open(sys.argv[3] + "/structs/" + struct_meth + ".java", "a")
 752             if not args_known:
 753                 out_java_struct.write("\t// Skipped " + re_match.group(2) + "\n")
 754                 out_java_struct.close()
 755                 out_java_struct = None
 756             else:
 757                 meth_n = re_match.group(2)[len(struct_meth) + 1:]
 758                 if ret_info.rust_obj == "LDK" + struct_meth:
 759                     out_java_struct.write("\tpublic static " + ret_info.java_hu_ty + " constructor_" + meth_n + "(")
 760                 else:
 761                     out_java_struct.write("\tpublic " + ret_info.java_hu_ty + " " + meth_n + "(")
 762                 for idx, arg in enumerate(arg_names):
 763                     if idx != 0:
 764                         if not takes_self or idx > 1:
 765                             out_java_struct.write(", ")
 766                     if arg.java_ty != "void" and arg.arg_name != "this_ptr" and arg.arg_name != "this_arg":
 767                         if arg.arg_name in default_constructor_args:
 768                             for explode_idx, explode_arg in enumerate(default_constructor_args[arg.arg_name]):
 769                                 if explode_idx != 0:
 770                                     out_java_struct.write(", ")
 771                                 assert explode_arg.rust_obj in opaque_structs or explode_arg.rust_obj in trait_structs
 772                                 out_java_struct.write(explode_arg.java_hu_ty + " " + arg.arg_name + "_" + explode_arg.arg_name)
 773                         else:
 774                             out_java_struct.write(arg.java_hu_ty + " " + arg.arg_name)
 775
 776
 777         out_java.write(");\n")
 778         out_c.write(") {\n")
 779         if out_java_struct is not None:
 780             out_java_struct.write(") {\n")
 781
 782         for info in arg_names:
 783             if info.arg_conv is not None:
 784                 out_c.write("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
 785
 786         if ret_info.ret_conv is not None:
 787             out_c.write("\t" + ret_conv_pfx.replace('\n', '\n\t'))
 788         elif ret_info.c_ty != "void":
 789             out_c.write("\t" + ret_info.c_ty + " ret_val = ")
 790         else:
 791             out_c.write("\t")
 792
 793         if c_call_string is None:
 794             out_c.write(re_match.group(2) + "(")
 795         else:
 796             out_c.write(c_call_string)
 797         for idx, info in enumerate(arg_names):
 798             if info.arg_conv_name is not None:
 799                 if idx != 0:
 800                     out_c.write(", ")
 801                 elif c_call_string is not None:
 802                     continue
 803                 out_c.write(info.arg_conv_name)
 804         out_c.write(")")
 805         if ret_info.ret_conv is not None:
 806             out_c.write(ret_conv_sfx.replace('\n', '\n\t'))
 807         else:
 808             out_c.write(";")
 809         for info in arg_names:
 810             if info.arg_conv_cleanup is not None:
 811                 out_c.write("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
 812         if ret_info.ret_conv is not None:
 813             out_c.write("\n\treturn " + ret_info.ret_conv_name + ";")
 814         elif ret_info.c_ty != "void":
 815             out_c.write("\n\treturn ret_val;")
 816         out_c.write("\n}\n\n")
 817         if out_java_struct is not None:
 818             out_java_struct.write("\t\t")
 819             if ret_info.java_ty != "void":
 820                 out_java_struct.write(ret_info.java_ty + " ret = ")
 821             out_java_struct.write("bindings." + re_match.group(2) + "(")
 822             for idx, info in enumerate(arg_names):
 823                 if idx != 0:
 824                     out_java_struct.write(", ")
 825                 if info.arg_name == "this_ptr" or info.arg_name == "this_arg":
 826                     out_java_struct.write("this.ptr")
 827                 elif info.arg_name in default_constructor_args:
 828                     out_java_struct.write("bindings." + info.java_hu_ty + "_new(")
 829                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
 830                         if explode_idx != 0:
 831                             out_java_struct.write(", ")
 832                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
 833                         out_java_struct.write(explode_arg.from_hu_conv[0].replace(explode_arg.arg_name, expl_arg_name))
 834                     out_java_struct.write(")")
 835                 elif info.from_hu_conv is not None:
 836                     out_java_struct.write(info.from_hu_conv[0])
 837                 else:
 838                     out_java_struct.write(info.arg_name)
 839             out_java_struct.write(");\n")
 840             if ret_info.to_hu_conv is not None:
 841                 out_java_struct.write("\t\t" + ret_info.to_hu_conv.replace("\n", "\n\t\t") + "\n")
 842
 843             for info in arg_names:
 844                 if info.arg_name == "this_ptr" or info.arg_name == "this_arg":
 845                     pass
 846                 elif info.arg_name in default_constructor_args:
 847                     for explode_arg in default_constructor_args[info.arg_name]:
 848                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
 849                         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")
 850                 elif info.from_hu_conv is not None and info.from_hu_conv[1] != "":
 851                     if ret_info.rust_obj == "LDK" + struct_meth and ret_info.to_hu_conv_name is not None:
 852                         out_java_struct.write("\t\t" + info.from_hu_conv[1].replace("this", ret_info.to_hu_conv_name) + ";\n")
 853                     else:
 854                         out_java_struct.write("\t\t" + info.from_hu_conv[1] + ";\n")
 855
 856             if ret_info.to_hu_conv_name is not None:
 857                 out_java_struct.write("\t\treturn " + ret_info.to_hu_conv_name + ";\n")
 858             elif ret_info.java_ty != "void" and ret_info.rust_obj != "LDK" + struct_meth:
 859                 out_java_struct.write("\t\treturn ret;\n")
 860             out_java_struct.write("\t}\n\n")
 861             out_java_struct.close()
 862
 863     def map_unitary_enum(struct_name, field_lines):
 864         with open(sys.argv[3] + "/enums/" + struct_name + ".java", "w") as out_java_enum:
 865             out_java_enum.write("package org.ldk.enums;\n\n")
 866             unitary_enums.add(struct_name)
 867             out_c.write("static inline " + struct_name + " " + struct_name + "_from_java(JNIEnv *env, jclass val) {\n")
 868             out_c.write("\tswitch ((*env)->CallIntMethod(env, val, ordinal_meth)) {\n")
 869             ord_v = 0
 870             for idx, struct_line in enumerate(field_lines):
 871                 if idx == 0:
 872                     out_java_enum.write("public enum " + struct_name + " {\n")
 873                 elif idx == len(field_lines) - 3:
 874                     assert(struct_line.endswith("_Sentinel,"))
 875                 elif idx == len(field_lines) - 2:
 876                     out_java_enum.write("\t; static native void init();\n")
 877                     out_java_enum.write("\tstatic { init(); }\n")
 878                     out_java_enum.write("}")
 879                     out_java.write("\tstatic { " + struct_name + ".values(); /* Force enum statics to run */ }\n")
 880                 elif idx == len(field_lines) - 1:
 881                     assert(struct_line == "")
 882                 else:
 883                     out_java_enum.write(struct_line + "\n")
 884                     out_c.write("\t\tcase %d: return %s;\n" % (ord_v, struct_line.strip().strip(",")))
 885                     ord_v = ord_v + 1
 886             out_c.write("\t}\n")
 887             out_c.write("\tabort();\n")
 888             out_c.write("}\n")
 889
 890             ord_v = 0
 891             out_c.write("static jclass " + struct_name + "_class = NULL;\n")
 892             for idx, struct_line in enumerate(field_lines):
 893                 if idx > 0 and idx < len(field_lines) - 3:
 894                     variant = struct_line.strip().strip(",")
 895                     out_c.write("static jfieldID " + struct_name + "_" + variant + " = NULL;\n")
 896             out_c.write("JNIEXPORT void JNICALL Java_org_ldk_enums_" + struct_name.replace("_", "_1") + "_init (JNIEnv * env, jclass clz) {\n")
 897             out_c.write("\t" + struct_name + "_class = (*env)->NewGlobalRef(env, clz);\n")
 898             out_c.write("\tCHECK(" + struct_name + "_class != NULL);\n")
 899             for idx, struct_line in enumerate(field_lines):
 900                 if idx > 0 and idx < len(field_lines) - 3:
 901                     variant = struct_line.strip().strip(",")
 902                     out_c.write("\t" + struct_name + "_" + variant + " = (*env)->GetStaticFieldID(env, " + struct_name + "_class, \"" + variant + "\", \"Lorg/ldk/enums/" + struct_name + ";\");\n")
 903                     out_c.write("\tCHECK(" + struct_name + "_" + variant + " != NULL);\n")
 904             out_c.write("}\n")
 905             out_c.write("static inline jclass " + struct_name + "_to_java(JNIEnv *env, " + struct_name + " val) {\n")
 906             out_c.write("\tswitch (val) {\n")
 907             for idx, struct_line in enumerate(field_lines):
 908                 if idx > 0 and idx < len(field_lines) - 3:
 909                     variant = struct_line.strip().strip(",")
 910                     out_c.write("\t\tcase " + variant + ":\n")
 911                     out_c.write("\t\t\treturn (*env)->GetStaticObjectField(env, " + struct_name + "_class, " + struct_name + "_" + variant + ");\n")
 912                     ord_v = ord_v + 1
 913             out_c.write("\t\tdefault: abort();\n")
 914             out_c.write("\t}\n")
 915             out_c.write("}\n\n")
 916
 917     def map_complex_enum(struct_name, union_enum_items):
 918         java_hu_type = struct_name.replace("LDK", "")
 919         complex_enums.add(struct_name)
 920         with open(sys.argv[3] + "/structs/" + java_hu_type + ".java", "w") as out_java_enum:
 921             out_java_enum.write(hu_struct_file_prefix)
 922             out_java_enum.write("public class " + java_hu_type + " extends CommonBase {\n")
 923             out_java_enum.write("\tprivate " + java_hu_type + "(Object _dummy, long ptr) { super(ptr); }\n")
 924             out_java_enum.write("\t@Override @SuppressWarnings(\"deprecation\")\n")
 925             out_java_enum.write("\tprotected void finalize() throws Throwable {\n")
 926             out_java_enum.write("\t\tsuper.finalize();\n")
 927             out_java_enum.write("\t\tbindings." + java_hu_type + "_free(ptr);\n")
 928             out_java_enum.write("\t}\n")
 929             out_java_enum.write("\tlong conv_to_c() { assert false; return 0; /* Should only be called on subclasses */ }\n")
 930             out_java_enum.write("\tstatic " + java_hu_type + " constr_from_ptr(long ptr) {\n")
 931             out_java_enum.write("\t\tbindings." + struct_name + " raw_val = bindings." + struct_name + "_ref_from_ptr(ptr);\n")
 932             java_hu_subclasses = ""
 933
 934             tag_field_lines = union_enum_items["field_lines"]
 935             init_meth_jty_strs = {}
 936             for idx, struct_line in enumerate(tag_field_lines):
 937                 if idx == 0:
 938                     out_java.write("\tpublic static class " + struct_name + " {\n")
 939                     out_java.write("\t\tprivate " + struct_name + "() {}\n")
 940                 elif idx == len(tag_field_lines) - 3:
 941                     assert(struct_line.endswith("_Sentinel,"))
 942                 elif idx == len(tag_field_lines) - 2:
 943                     out_java.write("\t\tstatic native void init();\n")
 944                     out_java.write("\t}\n")
 945                 elif idx == len(tag_field_lines) - 1:
 946                     assert(struct_line == "")
 947                 else:
 948                     var_name = struct_line.strip(' ,')[len(struct_name) + 1:]
 949                     out_java.write("\t\tpublic final static class " + var_name + " extends " + struct_name + " {\n")
 950                     java_hu_subclasses = java_hu_subclasses + "\tpublic final static class " + var_name + " extends " + java_hu_type + " {\n"
 951                     out_java_enum.write("\t\tif (raw_val.getClass() == bindings." + struct_name + "." + var_name + ".class) {\n")
 952                     out_java_enum.write("\t\t\treturn new " + var_name + "(ptr, (bindings." + struct_name + "." + var_name + ")raw_val);\n")
 953                     out_c.write("static jclass " + struct_name + "_" + var_name + "_class = NULL;\n")
 954                     out_c.write("static jmethodID " + struct_name + "_" + var_name + "_meth = NULL;\n")
 955                     init_meth_jty_str = ""
 956                     init_meth_params = ""
 957                     init_meth_body = ""
 958                     hu_conv_body = ""
 959                     if "LDK" + var_name in union_enum_items:
 960                         enum_var_lines = union_enum_items["LDK" + var_name]
 961                         for idx, field in enumerate(enum_var_lines):
 962                             if idx != 0 and idx < len(enum_var_lines) - 2:
 963                                 field_ty = map_type(field.strip(' ;'), False, None, False, True)
 964                                 out_java.write("\t\t\tpublic " + field_ty.java_ty + " " + field_ty.arg_name + ";\n")
 965                                 java_hu_subclasses = java_hu_subclasses + "\t\tpublic " + field_ty.java_hu_ty + " " + field_ty.arg_name + ";\n"
 966                                 if field_ty.to_hu_conv is not None:
 967                                     hu_conv_body = hu_conv_body + "\t\t\t" + field_ty.java_ty + " " + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
 968                                     hu_conv_body = hu_conv_body + "\t\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
 969                                     hu_conv_body = hu_conv_body + "\t\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
 970                                 else:
 971                                     hu_conv_body = hu_conv_body + "\t\t\tthis." + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
 972                                 init_meth_jty_str = init_meth_jty_str + field_ty.java_fn_ty_arg
 973                                 if idx > 1:
 974                                     init_meth_params = init_meth_params + ", "
 975                                 init_meth_params = init_meth_params + field_ty.java_ty + " " + field_ty.arg_name
 976                                 init_meth_body = init_meth_body + "this." + field_ty.arg_name + " = " + field_ty.arg_name + "; "
 977                         out_java.write("\t\t\t" + var_name + "(" + init_meth_params + ") { ")
 978                         out_java.write(init_meth_body)
 979                         out_java.write("}\n")
 980                     out_java.write("\t\t}\n")
 981                     out_java_enum.write("\t\t}\n")
 982                     java_hu_subclasses = java_hu_subclasses + "\t\tprivate " + var_name + "(long ptr, bindings." + struct_name + "." + var_name + " obj) {\n\t\t\tsuper(null, ptr);\n"
 983                     java_hu_subclasses = java_hu_subclasses + hu_conv_body
 984                     java_hu_subclasses = java_hu_subclasses + "\t\t}\n\t\t@Override long conv_to_c() { return 0; /*XXX*/ }\n"
 985                     java_hu_subclasses = java_hu_subclasses + "\t}\n"
 986                     init_meth_jty_strs[var_name] = init_meth_jty_str
 987             out_java_enum.write("\t\tassert false; return null; // Unreachable without extending the (internal) bindings interface\n\t}\n\n")
 988             out_java_enum.write(java_hu_subclasses)
 989             out_java.write("\tstatic { " + struct_name + ".init(); }\n")
 990             out_java.write("\tpublic static native " + struct_name + " " + struct_name + "_ref_from_ptr(long ptr);\n");
 991
 992             out_c.write("JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_00024" + struct_name.replace("_", "_1") + "_init (JNIEnv * env, jclass _a) {\n")
 993             for idx, struct_line in enumerate(tag_field_lines):
 994                 if idx != 0 and idx < len(tag_field_lines) - 3:
 995                     var_name = struct_line.strip(' ,')[len(struct_name) + 1:]
 996                     out_c.write("\t" + struct_name + "_" + var_name + "_class =\n")
 997                     out_c.write("\t\t(*env)->NewGlobalRef(env, (*env)->FindClass(env, \"Lorg/ldk/impl/bindings$" + struct_name + "$" + var_name + ";\"));\n")
 998                     out_c.write("\tCHECK(" + struct_name + "_" + var_name + "_class != NULL);\n")
 999                     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")
1000                     out_c.write("\tCHECK(" + struct_name + "_" + var_name + "_meth != NULL);\n")
1001             out_c.write("}\n")
1002             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")
1003             out_c.write("\t" + struct_name + " *obj = (" + struct_name + "*)ptr;\n")
1004             out_c.write("\tswitch(obj->tag) {\n")
1005             for idx, struct_line in enumerate(tag_field_lines):
1006                 if idx != 0 and idx < len(tag_field_lines) - 3:
1007                     var_name = struct_line.strip(' ,')[len(struct_name) + 1:]
1008                     out_c.write("\t\tcase " + struct_name + "_" + var_name + ": {\n")
1009                     c_params_text = ""
1010                     if "LDK" + var_name in union_enum_items:
1011                         enum_var_lines = union_enum_items["LDK" + var_name]
1012                         for idx, field in enumerate(enum_var_lines):
1013                             if idx != 0 and idx < len(enum_var_lines) - 2:
1014                                 field_map = map_type(field.strip(' ;'), False, None, False, True)
1015                                 if field_map.ret_conv is not None:
1016                                     out_c.write("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
1017                                     out_c.write("obj->" + camel_to_snake(var_name) + "." + field_map.arg_name)
1018                                     out_c.write(field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
1019                                     c_params_text = c_params_text + ", " + field_map.ret_conv_name
1020                                 else:
1021                                     c_params_text = c_params_text + ", obj->" + camel_to_snake(var_name) + "." + field_map.arg_name
1022                     out_c.write("\t\t\treturn (*_env)->NewObject(_env, " + struct_name + "_" + var_name + "_class, " + struct_name + "_" + var_name + "_meth" + c_params_text + ");\n")
1023                     out_c.write("\t\t}\n")
1024             out_c.write("\t\tdefault: abort();\n")
1025             out_c.write("\t}\n}\n")
1026             out_java_enum.write("}\n")
1027
1028     def map_trait(struct_name, field_var_lines, trait_fn_lines):
1029         with open(sys.argv[3] + "/structs/" + struct_name.replace("LDK","") + ".java", "w") as out_java_trait:
1030             out_c.write("typedef struct " + struct_name + "_JCalls {\n")
1031             out_c.write("\tatomic_size_t refcnt;\n")
1032             out_c.write("\tJavaVM *vm;\n")
1033             out_c.write("\tjweak o;\n")
1034             for var_line in field_var_lines:
1035                 if var_line.group(1) in trait_structs:
1036                     out_c.write("\t" + var_line.group(1) + "_JCalls* " + var_line.group(2) + ";\n")
1037             for fn_line in trait_fn_lines:
1038                 if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
1039                     out_c.write("\tjmethodID " + fn_line.group(2) + "_meth;\n")
1040             out_c.write("} " + struct_name + "_JCalls;\n")
1041
1042             out_java_trait.write(hu_struct_file_prefix)
1043             out_java_trait.write("public class " + struct_name.replace("LDK","") + " extends CommonBase {\n")
1044             out_java_trait.write("\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); }\n")
1045             out_java_trait.write("\tpublic " + struct_name.replace("LDK", "") + "(bindings." + struct_name + " arg") # XXX: Should be priv ( but is currently used in tests
1046             for var_line in field_var_lines:
1047                 if var_line.group(1) in trait_structs:
1048                     out_java_trait.write(", bindings." + var_line.group(1) + " " + var_line.group(2))
1049             out_java_trait.write(") {\n")
1050             out_java_trait.write("\t\tsuper(bindings." + struct_name + "_new(arg")
1051             for var_line in field_var_lines:
1052                 if var_line.group(1) in trait_structs:
1053                     out_java_trait.write(", " + var_line.group(2))
1054             out_java_trait.write("));\n")
1055             out_java_trait.write("\t\tthis.ptrs_to.add(arg);\n")
1056             out_java_trait.write("\t}\n")
1057             out_java_trait.write("\t@Override @SuppressWarnings(\"deprecation\")\n")
1058             out_java_trait.write("\tprotected void finalize() throws Throwable {\n")
1059             out_java_trait.write("\t\tbindings." + struct_name.replace("LDK","") + "_free(ptr); super.finalize();\n")
1060             out_java_trait.write("\t}\n\n")
1061
1062             java_trait_constr = "\tpublic " + struct_name.replace("LDK", "") + "(" + struct_name.replace("LDK", "") + "Interface arg) {\n"
1063             java_trait_constr = java_trait_constr + "\t\tthis(new bindings." + struct_name + "() {\n"
1064             #out_java_trait.write("\tpublic static interface " + struct_name.replace("LDK", "") + "Interface {\n")
1065             out_java.write("\tpublic interface " + struct_name + " {\n")
1066             java_meths = []
1067             for fn_line in trait_fn_lines:
1068                 java_meth_descr = "("
1069                 if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
1070                     ret_ty_info = map_type(fn_line.group(1), True, None, False, False)
1071
1072                     out_java.write("\t\t " + ret_ty_info.java_ty + " " + fn_line.group(2) + "(")
1073                     java_trait_constr = java_trait_constr + "\t\t\t@Override public " + ret_ty_info.java_ty + " " + fn_line.group(2) + "("
1074                     #out_java_trait.write("\t\t" + ret_ty_info.java_hu_ty + " " + fn_line.group(2) + "(")
1075                     is_const = fn_line.group(3) is not None
1076                     out_c.write(fn_line.group(1) + fn_line.group(2) + "_jcall(")
1077                     if is_const:
1078                         out_c.write("const void* this_arg")
1079                     else:
1080                         out_c.write("void* this_arg")
1081
1082                     arg_names = []
1083                     for idx, arg in enumerate(fn_line.group(4).split(',')):
1084                         if arg == "":
1085                             continue
1086                         if idx >= 2:
1087                             out_java.write(", ")
1088                             java_trait_constr = java_trait_constr + ", "
1089                             #out_java_trait.write(", ")
1090                         out_c.write(", ")
1091                         arg_conv_info = map_type(arg, True, None, False, False)
1092                         out_c.write(arg.strip())
1093                         out_java.write(arg_conv_info.java_ty + " " + arg_conv_info.arg_name)
1094                         #out_java_trait.write(arg_conv_info.java_ty + " " + arg_conv_info.arg_name)
1095                         java_trait_constr = java_trait_constr + arg_conv_info.java_ty + " " + arg_conv_info.arg_name
1096                         arg_names.append(arg_conv_info)
1097                         java_meth_descr = java_meth_descr + arg_conv_info.java_fn_ty_arg
1098                     java_meth_descr = java_meth_descr + ")" + ret_ty_info.java_fn_ty_arg
1099                     java_meths.append(java_meth_descr)
1100
1101                     out_java.write(");\n")
1102                     #out_java_trait.write(");\n")
1103                     java_trait_constr = java_trait_constr + ") {\n"
1104                     out_c.write(") {\n")
1105                     out_c.write("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
1106                     out_c.write("\tJNIEnv *_env;\n")
1107                     out_c.write("\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&_env, JNI_VERSION_1_8) == JNI_OK);\n")
1108
1109                     for arg_info in arg_names:
1110                         if arg_info.ret_conv is not None:
1111                             out_c.write("\t" + arg_info.ret_conv[0].replace('\n', '\n\t'));
1112                             out_c.write(arg_info.arg_name)
1113                             out_c.write(arg_info.ret_conv[1].replace('\n', '\n\t') + "\n")
1114
1115                     out_c.write("\tjobject obj = (*_env)->NewLocalRef(_env, j_calls->o);\n\tCHECK(obj != NULL);\n")
1116                     if ret_ty_info.c_ty.endswith("Array"):
1117                         out_c.write("\t" + ret_ty_info.c_ty + " ret = (*_env)->CallObjectMethod(_env, obj, j_calls->" + fn_line.group(2) + "_meth")
1118                     elif not ret_ty_info.passed_as_ptr:
1119                         out_c.write("\treturn (*_env)->Call" + ret_ty_info.java_ty.title() + "Method(_env, obj, j_calls->" + fn_line.group(2) + "_meth")
1120                     else:
1121                         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");
1122                     if ret_ty_info.java_ty != "void":
1123                         java_trait_constr = java_trait_constr + "\t\t\t\treturn arg." + fn_line.group(2) + "("
1124                     else:
1125                         java_trait_constr = java_trait_constr + "\t\t\t\targ." + fn_line.group(2) + "("
1126
1127                     for arg_info in arg_names:
1128                         if arg_info.ret_conv is not None:
1129                             out_c.write(", " + arg_info.ret_conv_name)
1130                         else:
1131                             out_c.write(", " + arg_info.arg_name)
1132                     out_c.write(");\n");
1133                     if ret_ty_info.arg_conv is not None:
1134                         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")
1135
1136                     if ret_ty_info.passed_as_ptr:
1137                         out_c.write("\t" + fn_line.group(1).strip() + " res = *ret;\n")
1138                         out_c.write("\tFREE(ret);\n")
1139                         out_c.write("\treturn res;\n")
1140                     out_c.write("}\n")
1141                     java_trait_constr = java_trait_constr + ");\n\t\t\t}\n"
1142                 elif fn_line.group(2) == "free":
1143                     out_c.write("static void " + struct_name + "_JCalls_free(void* this_arg) {\n")
1144                     out_c.write("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
1145                     out_c.write("\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n")
1146                     out_c.write("\t\tJNIEnv *env;\n")
1147                     out_c.write("\t\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_8) == JNI_OK);\n")
1148                     out_c.write("\t\t(*env)->DeleteWeakGlobalRef(env, j_calls->o);\n")
1149                     out_c.write("\t\tFREE(j_calls);\n")
1150                     out_c.write("\t}\n}\n")
1151             #out_java_trait.write("\t}\n")
1152             #out_java_trait.write(java_trait_constr + "\t\t});\n\t}\n")
1153
1154             # Write out a clone function whether we need one or not, as we use them in moving to rust
1155             out_c.write("static void* " + struct_name + "_JCalls_clone(const void* this_arg) {\n")
1156             out_c.write("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
1157             out_c.write("\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n")
1158             for var_line in field_var_lines:
1159                 if var_line.group(1) in trait_structs:
1160                     out_c.write("\tatomic_fetch_add_explicit(&j_calls->" + var_line.group(2) + "->refcnt, 1, memory_order_release);\n")
1161             out_c.write("\treturn (void*) this_arg;\n")
1162             out_c.write("}\n")
1163
1164             out_java.write("\t}\n")
1165
1166             out_java.write("\tpublic static native long " + struct_name + "_new(" + struct_name + " impl")
1167             out_c.write("static inline " + struct_name + " " + struct_name + "_init (JNIEnv * env, jclass _a, jobject o")
1168             for var_line in field_var_lines:
1169                 if var_line.group(1) in trait_structs:
1170                     out_java.write(", " + var_line.group(1) + " " + var_line.group(2))
1171                     out_c.write(", jobject " + var_line.group(2))
1172             out_java.write(");\n")
1173             out_c.write(") {\n")
1174
1175             out_c.write("\tjclass c = (*env)->GetObjectClass(env, o);\n")
1176             out_c.write("\tCHECK(c != NULL);\n")
1177             out_c.write("\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n")
1178             out_c.write("\tatomic_init(&calls->refcnt, 1);\n")
1179             out_c.write("\tDO_ASSERT((*env)->GetJavaVM(env, &calls->vm) == 0);\n")
1180             out_c.write("\tcalls->o = (*env)->NewWeakGlobalRef(env, o);\n")
1181             for (fn_line, java_meth_descr) in zip(trait_fn_lines, java_meths):
1182                 if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
1183                     out_c.write("\tcalls->" + fn_line.group(2) + "_meth = (*env)->GetMethodID(env, c, \"" + fn_line.group(2) + "\", \"" + java_meth_descr + "\");\n")
1184                     out_c.write("\tCHECK(calls->" + fn_line.group(2) + "_meth != NULL);\n")
1185             out_c.write("\n\t" + struct_name + " ret = {\n")
1186             out_c.write("\t\t.this_arg = (void*) calls,\n")
1187             for fn_line in trait_fn_lines:
1188                 if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
1189                     out_c.write("\t\t." + fn_line.group(2) + " = " + fn_line.group(2) + "_jcall,\n")
1190                 elif fn_line.group(2) == "free":
1191                     out_c.write("\t\t.free = " + struct_name + "_JCalls_free,\n")
1192                 else:
1193                     clone_fns.add(struct_name + "_clone")
1194                     out_c.write("\t\t.clone = " + struct_name + "_JCalls_clone,\n")
1195             for var_line in field_var_lines:
1196                 if var_line.group(1) in trait_structs:
1197                     out_c.write("\t\t." + var_line.group(2) + " = " + var_line.group(1) + "_init(env, _a, " + var_line.group(2) + "),\n")
1198             out_c.write("\t};\n")
1199             for var_line in field_var_lines:
1200                 if var_line.group(1) in trait_structs:
1201                     out_c.write("\tcalls->" + var_line.group(2) + " = ret." + var_line.group(2) + ".this_arg;\n")
1202             out_c.write("\treturn ret;\n")
1203             out_c.write("}\n")
1204
1205             out_c.write("JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1new (JNIEnv * env, jclass _a, jobject o")
1206             for var_line in field_var_lines:
1207                 if var_line.group(1) in trait_structs:
1208                     out_c.write(", jobject " + var_line.group(2))
1209             out_c.write(") {\n")
1210             out_c.write("\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n")
1211             out_c.write("\t*res_ptr = " + struct_name + "_init(env, _a, o")
1212             for var_line in field_var_lines:
1213                 if var_line.group(1) in trait_structs:
1214                     out_c.write(", " + var_line.group(2))
1215             out_c.write(");\n")
1216             out_c.write("\treturn (long)res_ptr;\n")
1217             out_c.write("}\n")
1218
1219             out_java.write("\tpublic static native " + struct_name + " " + struct_name + "_get_obj_from_jcalls(long val);\n")
1220             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")
1221             out_c.write("\tjobject ret = (*env)->NewLocalRef(env, ((" + struct_name + "_JCalls*)val)->o);\n")
1222             out_c.write("\tCHECK(ret != NULL);\n")
1223             out_c.write("\treturn ret;\n")
1224             out_c.write("}\n")
1225
1226         for fn_line in trait_fn_lines:
1227             # For now, just disable enabling the _call_log - we don't know how to inverse-map String
1228             is_log = fn_line.group(2) == "log" and struct_name == "LDKLogger"
1229             if fn_line.group(2) != "free" and fn_line.group(2) != "clone" and fn_line.group(2) != "eq" and not is_log:
1230                 dummy_line = fn_line.group(1) + struct_name.replace("LDK", "") + "_" + fn_line.group(2) + " " + struct_name + "* this_arg" + fn_line.group(4) + "\n"
1231                 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")
1232
1233     out_c.write("""#include \"org_ldk_impl_bindings.h\"
1234 #include <rust_types.h>
1235 #include <lightning.h>
1236 #include <string.h>
1237 #include <stdatomic.h>
1238 """)
1239
1240     if sys.argv[4] == "false":
1241         out_c.write("#define MALLOC(a, _) malloc(a)\n")
1242         out_c.write("#define FREE(p) if ((p) > 1024) { free(p); }\n")
1243         out_c.write("#define DO_ASSERT(a) (void)(a)\n")
1244         out_c.write("#define CHECK(a)\n")
1245     else:
1246         out_c.write("""#include <assert.h>
1247 // Always run a, then assert it is true:
1248 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
1249 // Assert a is true or do nothing
1250 #define CHECK(a) DO_ASSERT(a)
1251
1252 // Running a leak check across all the allocations and frees of the JDK is a mess,
1253 // so instead we implement our own naive leak checker here, relying on the -wrap
1254 // linker option to wrap malloc/calloc/realloc/free, tracking everyhing allocated
1255 // and free'd in Rust or C across the generated bindings shared library.
1256 #include <threads.h>
1257 #include <execinfo.h>
1258 #include <unistd.h>
1259 static mtx_t allocation_mtx;
1260
1261 void __attribute__((constructor)) init_mtx() {
1262         DO_ASSERT(mtx_init(&allocation_mtx, mtx_plain) == thrd_success);
1263 }
1264
1265 #define BT_MAX 128
1266 typedef struct allocation {
1267         struct allocation* next;
1268         void* ptr;
1269         const char* struct_name;
1270         void* bt[BT_MAX];
1271         int bt_len;
1272 } allocation;
1273 static allocation* allocation_ll = NULL;
1274
1275 void* __real_malloc(size_t len);
1276 void* __real_calloc(size_t nmemb, size_t len);
1277 static void new_allocation(void* res, const char* struct_name) {
1278         allocation* new_alloc = __real_malloc(sizeof(allocation));
1279         new_alloc->ptr = res;
1280         new_alloc->struct_name = struct_name;
1281         new_alloc->bt_len = backtrace(new_alloc->bt, BT_MAX);
1282         DO_ASSERT(mtx_lock(&allocation_mtx) == thrd_success);
1283         new_alloc->next = allocation_ll;
1284         allocation_ll = new_alloc;
1285         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
1286 }
1287 static void* MALLOC(size_t len, const char* struct_name) {
1288         void* res = __real_malloc(len);
1289         new_allocation(res, struct_name);
1290         return res;
1291 }
1292 void __real_free(void* ptr);
1293 static void alloc_freed(void* ptr) {
1294         allocation* p = NULL;
1295         DO_ASSERT(mtx_lock(&allocation_mtx) == thrd_success);
1296         allocation* it = allocation_ll;
1297         while (it->ptr != ptr) { p = it; it = it->next; }
1298         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
1299         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
1300         DO_ASSERT(it->ptr == ptr);
1301         __real_free(it);
1302 }
1303 static void FREE(void* ptr) {
1304         if ((long)ptr < 1024) return; // Rust loves to create pointers to the NULL page for dummys
1305         alloc_freed(ptr);
1306         __real_free(ptr);
1307 }
1308
1309 void* __wrap_malloc(size_t len) {
1310         void* res = __real_malloc(len);
1311         new_allocation(res, "malloc call");
1312         return res;
1313 }
1314 void* __wrap_calloc(size_t nmemb, size_t len) {
1315         void* res = __real_calloc(nmemb, len);
1316         new_allocation(res, "calloc call");
1317         return res;
1318 }
1319 void __wrap_free(void* ptr) {
1320         alloc_freed(ptr);
1321         __real_free(ptr);
1322 }
1323
1324 void* __real_realloc(void* ptr, size_t newlen);
1325 void* __wrap_realloc(void* ptr, size_t len) {
1326         alloc_freed(ptr);
1327         void* res = __real_realloc(ptr, len);
1328         new_allocation(res, "realloc call");
1329         return res;
1330 }
1331 void __wrap_reallocarray(void* ptr, size_t new_sz) {
1332         // Rust doesn't seem to use reallocarray currently
1333         assert(false);
1334 }
1335
1336 void __attribute__((destructor)) check_leaks() {
1337         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
1338                 fprintf(stderr, "%s %p remains:\\n", a->struct_name, a->ptr);
1339                 backtrace_symbols_fd(a->bt, a->bt_len, STDERR_FILENO);
1340                 fprintf(stderr, "\\n\\n");
1341         }
1342         DO_ASSERT(allocation_ll == NULL);
1343 }
1344 """)
1345     out_java.write("""package org.ldk.impl;
1346 import org.ldk.enums.*;
1347
1348 public class bindings {
1349         public static class VecOrSliceDef {
1350                 public long dataptr;
1351                 public long datalen;
1352                 public long stride;
1353                 public VecOrSliceDef(long dataptr, long datalen, long stride) {
1354                         this.dataptr = dataptr; this.datalen = datalen; this.stride = stride;
1355                 }
1356         }
1357         static {
1358                 System.loadLibrary(\"lightningjni\");
1359                 init(java.lang.Enum.class, VecOrSliceDef.class);
1360         }
1361         static native void init(java.lang.Class c, java.lang.Class slicedef);
1362
1363         public static native boolean deref_bool(long ptr);
1364         public static native long deref_long(long ptr);
1365         public static native void free_heap_ptr(long ptr);
1366         public static native byte[] read_bytes(long ptr, long len);
1367         public static native byte[] get_u8_slice_bytes(long slice_ptr);
1368         public static native long bytes_to_u8_vec(byte[] bytes);
1369         public static native long new_txpointer_copy_data(byte[] txdata);
1370         public static native long vec_slice_len(long vec);
1371         public static native long new_empty_slice_vec();
1372
1373 """)
1374     out_c.write("""
1375 static jmethodID ordinal_meth = NULL;
1376 static jmethodID slicedef_meth = NULL;
1377 static jclass slicedef_cls = NULL;
1378 JNIEXPORT void Java_org_ldk_impl_bindings_init(JNIEnv * env, jclass _b, jclass enum_class, jclass slicedef_class) {
1379         ordinal_meth = (*env)->GetMethodID(env, enum_class, "ordinal", "()I");
1380         CHECK(ordinal_meth != NULL);
1381         slicedef_meth = (*env)->GetMethodID(env, slicedef_class, "<init>", "(JJJ)V");
1382         CHECK(slicedef_meth != NULL);
1383         slicedef_cls = (*env)->NewGlobalRef(env, slicedef_class);
1384         CHECK(slicedef_cls != NULL);
1385 }
1386
1387 JNIEXPORT jboolean JNICALL Java_org_ldk_impl_bindings_deref_1bool (JNIEnv * env, jclass _a, jlong ptr) {
1388         return *((bool*)ptr);
1389 }
1390 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_deref_1long (JNIEnv * env, jclass _a, jlong ptr) {
1391         return *((long*)ptr);
1392 }
1393 JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_free_1heap_1ptr (JNIEnv * env, jclass _a, jlong ptr) {
1394         FREE((void*)ptr);
1395 }
1396 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_read_1bytes (JNIEnv * _env, jclass _b, jlong ptr, jlong len) {
1397         jbyteArray ret_arr = (*_env)->NewByteArray(_env, len);
1398         (*_env)->SetByteArrayRegion(_env, ret_arr, 0, len, (unsigned char*)ptr);
1399         return ret_arr;
1400 }
1401 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_get_1u8_1slice_1bytes (JNIEnv * _env, jclass _b, jlong slice_ptr) {
1402         LDKu8slice *slice = (LDKu8slice*)slice_ptr;
1403         jbyteArray ret_arr = (*_env)->NewByteArray(_env, slice->datalen);
1404         (*_env)->SetByteArrayRegion(_env, ret_arr, 0, slice->datalen, slice->data);
1405         return ret_arr;
1406 }
1407 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_bytes_1to_1u8_1vec (JNIEnv * _env, jclass _b, jbyteArray bytes) {
1408         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "LDKCVec_u8");
1409         vec->datalen = (*_env)->GetArrayLength(_env, bytes);
1410         vec->data = (uint8_t*)MALLOC(vec->datalen, "LDKCVec_u8Z Bytes");
1411         (*_env)->GetByteArrayRegion (_env, bytes, 0, vec->datalen, vec->data);
1412         return (long)vec;
1413 }
1414 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_new_1txpointer_1copy_1data (JNIEnv * env, jclass _b, jbyteArray bytes) {
1415         LDKTransaction *txdata = (LDKTransaction*)MALLOC(sizeof(LDKTransaction), "LDKTransaction");
1416         txdata->datalen = (*env)->GetArrayLength(env, bytes);
1417         txdata->data = (uint8_t*)MALLOC(txdata->datalen, "Tx Data Bytes");
1418         txdata->data_is_owned = true;
1419         (*env)->GetByteArrayRegion (env, bytes, 0, txdata->datalen, txdata->data);
1420         return (long)txdata;
1421 }
1422 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_vec_1slice_1len (JNIEnv * env, jclass _a, jlong ptr) {
1423         // Check offsets of a few Vec types are all consistent as we're meant to be generic across types
1424         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_SignatureZ, datalen), "Vec<*> needs to be mapped identically");
1425         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_MessageSendEventZ, datalen), "Vec<*> needs to be mapped identically");
1426         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_EventZ, datalen), "Vec<*> needs to be mapped identically");
1427         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_C2Tuple_usizeTransactionZZ, datalen), "Vec<*> needs to be mapped identically");
1428         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)ptr;
1429         return (long)vec->datalen;
1430 }
1431 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_new_1empty_1slice_1vec (JNIEnv * _env, jclass _b) {
1432         // Check sizes of a few Vec types are all consistent as we're meant to be generic across types
1433         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_SignatureZ), "Vec<*> needs to be mapped identically");
1434         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_MessageSendEventZ), "Vec<*> needs to be mapped identically");
1435         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_EventZ), "Vec<*> needs to be mapped identically");
1436         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_C2Tuple_usizeTransactionZZ), "Vec<*> needs to be mapped identically");
1437         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "Empty LDKCVec");
1438         vec->data = NULL;
1439         vec->datalen = 0;
1440         return (long)vec;
1441 }
1442
1443 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
1444 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
1445 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
1446 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
1447
1448 """)
1449
1450     with open(sys.argv[3] + "/structs/CommonBase.java", "a") as out_java_struct:
1451         out_java_struct.write("""package org.ldk.structs;
1452 import java.util.LinkedList;
1453 class CommonBase {
1454         final long ptr;
1455         LinkedList<Object> ptrs_to = new LinkedList();
1456         protected CommonBase(long ptr) { this.ptr = ptr; }
1457         public long _test_only_get_ptr() { return this.ptr; }
1458 }
1459 """)
1460
1461     in_block_comment = False
1462     cur_block_obj = None
1463
1464     const_val_regex = re.compile("^extern const ([A-Za-z_0-9]*) ([A-Za-z_0-9]*);$")
1465
1466     line_indicates_result_regex = re.compile("^   (LDKCResultPtr_[A-Za-z_0-9]*) contents;$")
1467     line_indicates_vec_regex = re.compile("^   ([A-Za-z_0-9]*) \*data;$")
1468     line_indicates_opaque_regex = re.compile("^   bool is_owned;$")
1469     line_indicates_trait_regex = re.compile("^   ([A-Za-z_0-9]* \*?)\(\*([A-Za-z_0-9]*)\)\((const )?void \*this_arg(.*)\);$")
1470     assert(line_indicates_trait_regex.match("   uintptr_t (*send_data)(void *this_arg, LDKu8slice data, bool resume_read);"))
1471     assert(line_indicates_trait_regex.match("   LDKCVec_MessageSendEventZ (*get_and_clear_pending_msg_events)(const void *this_arg);"))
1472     assert(line_indicates_trait_regex.match("   void *(*clone)(const void *this_arg);"))
1473     line_field_var_regex = re.compile("^   ([A-Za-z_0-9]*) ([A-Za-z_0-9]*);$")
1474     assert(line_field_var_regex.match("   LDKMessageSendEventsProvider MessageSendEventsProvider;"))
1475     struct_name_regex = re.compile("^typedef (struct|enum|union) (MUST_USE_STRUCT )?(LDK[A-Za-z_0-9]*) {$")
1476     assert(struct_name_regex.match("typedef struct LDKCVecTempl_u8 {"))
1477     assert(struct_name_regex.match("typedef enum LDKNetwork {"))
1478     struct_alias_regex = re.compile("^typedef (LDK[A-Za-z_0-9]*) (LDK[A-Za-z_0-9]*);$")
1479     assert(struct_alias_regex.match("typedef LDKCResultTempl_bool__PeerHandleError LDKCResult_boolPeerHandleErrorZ;"))
1480
1481     result_templ_structs = set()
1482     union_enum_items = {}
1483     result_ptr_struct_items = {}
1484     for line in in_h:
1485         if in_block_comment:
1486             if line.endswith("*/\n"):
1487                 in_block_comment = False
1488         elif cur_block_obj is not None:
1489             cur_block_obj  = cur_block_obj + line
1490             if line.startswith("} "):
1491                 field_lines = []
1492                 struct_name = None
1493                 vec_ty = None
1494                 obj_lines = cur_block_obj.split("\n")
1495                 is_opaque = False
1496                 result_contents = None
1497                 is_unitary_enum = False
1498                 is_union_enum = False
1499                 is_union = False
1500                 is_tuple = False
1501                 trait_fn_lines = []
1502                 field_var_lines = []
1503
1504                 for idx, struct_line in enumerate(obj_lines):
1505                     if struct_line.strip().startswith("/*"):
1506                         in_block_comment = True
1507                     if in_block_comment:
1508                         if struct_line.endswith("*/"):
1509                             in_block_comment = False
1510                     else:
1511                         struct_name_match = struct_name_regex.match(struct_line)
1512                         if struct_name_match is not None:
1513                             struct_name = struct_name_match.group(3)
1514                             if struct_name_match.group(1) == "enum":
1515                                 if not struct_name.endswith("_Tag"):
1516                                     is_unitary_enum = True
1517                                 else:
1518                                     is_union_enum = True
1519                             elif struct_name_match.group(1) == "union":
1520                                 is_union = True
1521                         if line_indicates_opaque_regex.match(struct_line):
1522                             is_opaque = True
1523                         result_match = line_indicates_result_regex.match(struct_line)
1524                         if result_match is not None:
1525                             result_contents = result_match.group(1)
1526                         vec_ty_match = line_indicates_vec_regex.match(struct_line)
1527                         if vec_ty_match is not None and struct_name.startswith("LDKCVecTempl_"):
1528                             vec_ty = vec_ty_match.group(1)
1529                         elif struct_name.startswith("LDKC2TupleTempl_") or struct_name.startswith("LDKC3TupleTempl_"):
1530                             is_tuple = True
1531                         trait_fn_match = line_indicates_trait_regex.match(struct_line)
1532                         if trait_fn_match is not None:
1533                             trait_fn_lines.append(trait_fn_match)
1534                         field_var_match = line_field_var_regex.match(struct_line)
1535                         if field_var_match is not None:
1536                             field_var_lines.append(field_var_match)
1537                         field_lines.append(struct_line)
1538
1539                 assert(struct_name is not None)
1540                 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))
1541                 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))
1542                 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))
1543                 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))
1544                 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))
1545                 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))
1546                 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))
1547
1548                 if is_opaque:
1549                     opaque_structs.add(struct_name)
1550                     with open(sys.argv[3] + "/structs/" + struct_name.replace("LDK","") + ".java", "w") as out_java_struct:
1551                         out_java_struct.write(hu_struct_file_prefix)
1552                         out_java_struct.write("public class " + struct_name.replace("LDK","") + " extends CommonBase")
1553                         if struct_name.startswith("LDKLocked"):
1554                             out_java_struct.write(" implements AutoCloseable")
1555                         out_java_struct.write(" {\n")
1556                         out_java_struct.write("\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); }\n")
1557                         if struct_name.startswith("LDKLocked"):
1558                             out_java_struct.write("\t@Override public void close() {\n")
1559                         else:
1560                             out_java_struct.write("\t@Override @SuppressWarnings(\"deprecation\")\n")
1561                             out_java_struct.write("\tprotected void finalize() throws Throwable {\n")
1562                             out_java_struct.write("\t\tsuper.finalize();\n")
1563                         out_java_struct.write("\t\tbindings." + struct_name.replace("LDK","") + "_free(ptr);\n")
1564                         out_java_struct.write("\t}\n\n")
1565                 elif result_contents is not None:
1566                     result_templ_structs.add(struct_name)
1567                     assert result_contents in result_ptr_struct_items
1568                 elif struct_name.startswith("LDKCResultPtr_"):
1569                     for line in field_lines:
1570                         if line.endswith("*result;"):
1571                             res_ty = line[:-8].strip()
1572                         elif line.endswith("*err;"):
1573                             err_ty = line[:-5].strip()
1574                     result_ptr_struct_items[struct_name] = (res_ty, err_ty)
1575                 elif is_tuple:
1576                     out_java.write("\tpublic static native long " + struct_name + "_new(")
1577                     out_c.write("JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1new(JNIEnv *_env, jclass _b")
1578                     ty_list = []
1579                     for idx, line in enumerate(field_lines):
1580                         if idx != 0 and idx < len(field_lines) - 2:
1581                             ty_info = java_c_types(line.strip(';'), None)
1582                             if idx != 1:
1583                                 out_java.write(", ")
1584                             e = chr(ord('a') + idx - 1)
1585                             out_java.write(ty_info.java_ty + " " + e)
1586                             out_c.write(", " + ty_info.c_ty + " " + e)
1587                             ty_list.append(ty_info)
1588                     tuple_types[struct_name] = (ty_list, struct_name)
1589                     out_java.write(");\n")
1590                     out_c.write(") {\n")
1591                     out_c.write("\t" + struct_name + "* ret = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n")
1592                     for idx, line in enumerate(field_lines):
1593                         if idx != 0 and idx < len(field_lines) - 2:
1594                             ty_info = map_type(line.strip(';'), False, None, False, False)
1595                             e = chr(ord('a') + idx - 1)
1596                             if ty_info.arg_conv is not None:
1597                                 out_c.write("\t" + ty_info.arg_conv.replace("\n", "\n\t"))
1598                                 out_c.write("\n\tret->" + e + " = " + ty_info.arg_conv_name + ";\n")
1599                             else:
1600                                 out_c.write("\tret->" + e + " = " + e + ";\n")
1601                             if ty_info.arg_conv_cleanup is not None:
1602                                 out_c.write("\t//TODO: Really need to call " + ty_info.arg_conv_cleanup + " here\n")
1603                     out_c.write("\treturn (long)ret;\n")
1604                     out_c.write("}\n")
1605                 elif vec_ty is not None:
1606                     if vec_ty in opaque_structs:
1607                         out_java.write("\tpublic static native long[] " + struct_name + "_arr_info(long vec_ptr);\n")
1608                         out_c.write("JNIEXPORT jlongArray JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1arr_1info(JNIEnv *env, jclass _b, jlong ptr) {\n")
1609                     else:
1610                         out_java.write("\tpublic static native VecOrSliceDef " + struct_name + "_arr_info(long vec_ptr);\n")
1611                         out_c.write("JNIEXPORT jobject JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1arr_1info(JNIEnv *env, jclass _b, jlong ptr) {\n")
1612                     out_c.write("\t" + struct_name + " *vec = (" + struct_name + "*)ptr;\n")
1613                     if vec_ty in opaque_structs:
1614                         out_c.write("\tjlongArray ret = (*env)->NewLongArray(env, vec->datalen);\n")
1615                         out_c.write("\tjlong *ret_elems = (*env)->GetPrimitiveArrayCritical(env, ret, NULL);\n")
1616                         out_c.write("\tfor (size_t i = 0; i < vec->datalen; i++) {\n")
1617                         out_c.write("\t\tCHECK((((long)vec->data[i].inner) & 1) == 0);\n")
1618                         out_c.write("\t\tret_elems[i] = (long)vec->data[i].inner | (vec->data[i].is_owned ? 1 : 0);\n")
1619                         out_c.write("\t}\n")
1620                         out_c.write("\t(*env)->ReleasePrimitiveArrayCritical(env, ret, ret_elems, 0);\n")
1621                         out_c.write("\treturn ret;\n")
1622                     else:
1623                         out_c.write("\treturn (*env)->NewObject(env, slicedef_cls, slicedef_meth, (long)vec->data, (long)vec->datalen, sizeof(" + vec_ty + "));\n")
1624                     out_c.write("}\n")
1625
1626                     ty_info = map_type(vec_ty + " arr_elem", False, None, False, False)
1627                     if len(ty_info.java_fn_ty_arg) == 1: # ie we're a primitive of some form
1628                         out_java.write("\tpublic static native long " + struct_name + "_new(" + ty_info.java_ty + "[] elems);\n")
1629                         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")
1630                         out_c.write("\t" + struct_name + " *ret = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n")
1631                         out_c.write("\tret->datalen = (*env)->GetArrayLength(env, elems);\n")
1632                         out_c.write("\tif (ret->datalen == 0) {\n")
1633                         out_c.write("\t\tret->data = NULL;\n")
1634                         out_c.write("\t} else {\n")
1635                         out_c.write("\t\tret->data = MALLOC(sizeof(" + vec_ty + ") * ret->datalen, \"" + struct_name + " Data\");\n")
1636                         out_c.write("\t\t" + ty_info.c_ty + " *java_elems = (*env)->GetPrimitiveArrayCritical(env, elems, NULL);\n")
1637                         out_c.write("\t\tfor (size_t i = 0; i < ret->datalen; i++) {\n")
1638                         if ty_info.arg_conv is not None:
1639                             out_c.write("\t\t\t" + ty_info.c_ty + " arr_elem = java_elems[i];\n")
1640                             out_c.write("\t\t\t" + ty_info.arg_conv.replace("\n", "\n\t\t\t") + "\n")
1641                             out_c.write("\t\t\tret->data[i] = " + ty_info.arg_conv_name + ";\n")
1642                             assert ty_info.arg_conv_cleanup is None
1643                         else:
1644                             out_c.write("\t\t\tret->data[i] = java_elems[i];\n")
1645                         out_c.write("\t\t}\n")
1646                         out_c.write("\t\t(*env)->ReleasePrimitiveArrayCritical(env, elems, java_elems, 0);\n")
1647                         out_c.write("\t}\n")
1648                         out_c.write("\treturn (long)ret;\n")
1649                         out_c.write("}\n")
1650                 elif is_union_enum:
1651                     assert(struct_name.endswith("_Tag"))
1652                     struct_name = struct_name[:-4]
1653                     union_enum_items[struct_name] = {"field_lines": field_lines}
1654                 elif struct_name.endswith("_Body") and struct_name.split("_")[0] in union_enum_items:
1655                     enum_var_name = struct_name.split("_")
1656                     union_enum_items[enum_var_name[0]][enum_var_name[1]] = field_lines
1657                 elif struct_name in union_enum_items:
1658                     map_complex_enum(struct_name, union_enum_items[struct_name])
1659                 elif is_unitary_enum:
1660                     map_unitary_enum(struct_name, field_lines)
1661                 elif len(trait_fn_lines) > 0:
1662                     trait_structs.add(struct_name)
1663                     map_trait(struct_name, field_var_lines, trait_fn_lines)
1664                 elif struct_name == "LDKTxOut":
1665                     with open(sys.argv[3] + "/structs/TxOut.java", "w") as out_java_struct:
1666                         out_java_struct.write(hu_struct_file_prefix)
1667                         out_java_struct.write("public class TxOut extends CommonBase{\n")
1668                         out_java_struct.write("\tTxOut(java.lang.Object _dummy, long ptr) { super(ptr); }\n")
1669                         # TODO: TxOut body
1670                         out_java_struct.write("}")
1671                 elif struct_name == "LDKTransaction":
1672                     with open(sys.argv[3] + "/structs/Transaction.java", "w") as out_java_struct:
1673                         out_java_struct.write(hu_struct_file_prefix)
1674                         out_java_struct.write("public class Transaction extends CommonBase{\n")
1675                         out_java_struct.write("\tTransaction(java.lang.Object _dummy, long ptr) { super(ptr); }\n")
1676                         # TODO: Transaction body
1677                         out_java_struct.write("}")
1678                 else:
1679                     pass # Everything remaining is a byte[] or some form
1680                 cur_block_obj = None
1681         else:
1682             fn_ptr = fn_ptr_regex.match(line)
1683             fn_ret_arr = fn_ret_arr_regex.match(line)
1684             reg_fn = reg_fn_regex.match(line)
1685             const_val = const_val_regex.match(line)
1686
1687             if line.startswith("#include <"):
1688                 pass
1689             elif line.startswith("/*"):
1690                 #out_java.write("\t" + line)
1691                 if not line.endswith("*/\n"):
1692                     in_block_comment = True
1693             elif line.startswith("typedef enum "):
1694                 cur_block_obj = line
1695             elif line.startswith("typedef struct "):
1696                 cur_block_obj = line
1697             elif line.startswith("typedef union "):
1698                 cur_block_obj = line
1699             elif line.startswith("typedef "):
1700                 alias_match =  struct_alias_regex.match(line)
1701                 if alias_match.group(1) in tuple_types:
1702                     tuple_types[alias_match.group(2)] = (tuple_types[alias_match.group(1)][0], alias_match.group(2))
1703                     tuple_types[alias_match.group(1)] = (tuple_types[alias_match.group(1)][0], alias_match.group(2))
1704                     for idx, ty_info in enumerate(tuple_types[alias_match.group(1)][0]):
1705                         e = chr(ord('a') + idx)
1706                         out_java.write("\tpublic static native " + ty_info.java_ty + " " + alias_match.group(2) + "_get_" + e + "(long ptr);\n")
1707                         # XXX: Write C method!
1708                 elif alias_match.group(1) in result_templ_structs:
1709                     human_ty = alias_match.group(2).replace("LDKCResult", "Result_").replace("__", "_").replace("Templ", "")
1710                     with open(sys.argv[3] + "/structs/" + human_ty + ".java", "w") as out_java_struct:
1711                         out_java_struct.write(hu_struct_file_prefix)
1712                         out_java_struct.write("public class " + human_ty + " extends CommonBase {\n")
1713                         out_java_struct.write("\tprivate " + human_ty + "(Object _dummy, long ptr) { super(ptr); }\n")
1714                         out_java_struct.write("\tprotected void finalize() throws Throwable {\n")
1715                         out_java_struct.write("\t\tbindings." + alias_match.group(2).replace("LDK","") + "_free(ptr); super.finalize();\n")
1716                         out_java_struct.write("\t}\n\n")
1717
1718                         contents_ty = alias_match.group(1).replace("LDKCResultTempl", "LDKCResultPtr")
1719                         res_ty, err_ty = result_ptr_struct_items[contents_ty]
1720                         res_map = map_type(res_ty + " res", True, None, False, True)
1721                         err_map = map_type(err_ty + " err", True, None, False, True)
1722
1723                         out_java.write("\tpublic static native boolean " + alias_match.group(2) + "_result_ok(long arg);\n")
1724                         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")
1725                         out_c.write("\treturn ((" + alias_match.group(2) + "*)arg)->result_ok;\n")
1726                         out_c.write("}\n")
1727
1728                         out_java.write("\tpublic static native " + res_map.java_ty + " " + alias_match.group(2) + "_get_ok(long arg);\n")
1729                         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")
1730                         out_c.write("\t" + alias_match.group(2) + " *val = (" + alias_match.group(2) + "*)arg;\n")
1731                         out_c.write("\tCHECK(val->result_ok);\n\t")
1732                         out_java_struct.write("\tpublic static final class " + human_ty + "_OK extends " + human_ty + " {\n")
1733                         if res_map.ret_conv is not None:
1734                             out_c.write(res_map.ret_conv[0].replace("\n", "\n\t") + "(*val->contents.result)")
1735                             out_c.write(res_map.ret_conv[1].replace("\n", "\n\t") + "\n\treturn " + res_map.ret_conv_name)
1736                         else:
1737                             out_c.write("return *val->contents.result")
1738                         out_c.write(";\n}\n")
1739
1740                         out_java_struct.write("\t\tpublic " + res_map.java_hu_ty + " res;\n")
1741                         out_java_struct.write("\t\tprivate " + human_ty + "_OK(Object _dummy, long ptr) {\n")
1742                         out_java_struct.write("\t\t\tsuper(_dummy, ptr);\n")
1743                         if res_map.to_hu_conv is not None:
1744                             out_java_struct.write("\t\t\t" + res_map.java_ty + " res = bindings." + alias_match.group(2) + "_get_ok(ptr);\n")
1745                             out_java_struct.write("\t\t\t" + res_map.to_hu_conv.replace("\n", "\n\t\t\t"))
1746                             out_java_struct.write("\n\t\t\tthis.res = " + res_map.to_hu_conv_name + ";\n")
1747                         else:
1748                             out_java_struct.write("\t\t\tthis.res = bindings." + alias_match.group(2) + "_get_ok(ptr);\n")
1749                         out_java_struct.write("\t\t}\n\n")
1750
1751                         out_java.write("\tpublic static native " + err_map.java_ty + " " + alias_match.group(2) + "_get_err(long arg);\n")
1752                         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")
1753                         out_c.write("\t" + alias_match.group(2) + " *val = (" + alias_match.group(2) + "*)arg;\n")
1754                         out_c.write("\tCHECK(!val->result_ok);\n\t")
1755                         out_java_struct.write("\t}\n\tpublic static final class " + human_ty + "_Err extends " + human_ty + " {\n")
1756                         if err_map.ret_conv is not None:
1757                             out_c.write(err_map.ret_conv[0].replace("\n", "\n\t") + "(*val->contents.err)")
1758                             out_c.write(err_map.ret_conv[1].replace("\n", "\n\t") + "\n\treturn " + err_map.ret_conv_name)
1759                         else:
1760                             out_c.write("return *val->contents.err")
1761                         out_c.write(";\n}\n")
1762
1763                         out_java_struct.write("\t\tpublic " + err_map.java_hu_ty + " err;\n")
1764                         out_java_struct.write("\t\tprivate " + human_ty + "_Err(Object _dummy, long ptr) {\n")
1765                         out_java_struct.write("\t\t\tsuper(_dummy, ptr);\n")
1766                         if err_map.to_hu_conv is not None:
1767                             out_java_struct.write("\t\t\t" + err_map.java_ty + " err = bindings." + alias_match.group(2) + "_get_err(ptr);\n")
1768                             out_java_struct.write("\t\t\t" + err_map.to_hu_conv.replace("\n", "\n\t\t\t"))
1769                             out_java_struct.write("\n\t\t\tthis.err = " + err_map.to_hu_conv_name + ";\n")
1770                         else:
1771                             out_java_struct.write("\t\t\tthis.err = bindings." + alias_match.group(2) + "_get_err(ptr);\n")
1772                         out_java_struct.write("\t\t}\n\t}\n}\n")
1773             elif fn_ptr is not None:
1774                 map_fn(line, fn_ptr, None, None)
1775             elif fn_ret_arr is not None:
1776                 map_fn(line, fn_ret_arr, fn_ret_arr.group(4), None)
1777             elif reg_fn is not None:
1778                 map_fn(line, reg_fn, None, None)
1779             elif const_val_regex is not None:
1780                 # TODO Map const variables
1781                 pass
1782             else:
1783                 assert(line == "\n")
1784
1785     out_java.write("}\n")
1786     for struct_name in opaque_structs:
1787         with open(sys.argv[3] + "/structs/" + struct_name.replace("LDK","") + ".java", "a") as out_java_struct:
1788             out_java_struct.write("}\n")
1789     for struct_name in trait_structs:
1790         with open(sys.argv[3] + "/structs/" + struct_name.replace("LDK","") + ".java", "a") as out_java_struct:
1791             out_java_struct.write("}\n")