_ 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 result_types = set()
  99 tuple_types = {}
 100
 101 def is_common_base_ext(struct_name):
 102     return struct_name in complex_enums or struct_name in opaque_structs or struct_name in trait_structs or struct_name in result_types
 103
 104 var_is_arr_regex = re.compile("\(\*([A-za-z0-9_]*)\)\[([a-z0-9]*)\]")
 105 var_ty_regex = re.compile("([A-za-z_0-9]*)(.*)")
 106 java_c_types_none_allowed = True # Unset when we do the real pass that populates the above sets
 107 def java_c_types(fn_arg, ret_arr_len):
 108     fn_arg = fn_arg.strip()
 109     if fn_arg.startswith("MUST_USE_RES "):
 110         fn_arg = fn_arg[13:]
 111     is_const = False
 112     if fn_arg.startswith("const "):
 113         fn_arg = fn_arg[6:]
 114         is_const = True
 115
 116     is_ptr = False
 117     take_by_ptr = False
 118     rust_obj = None
 119     arr_access = None
 120     java_hu_ty = None
 121     if fn_arg.startswith("LDKThirtyTwoBytes"):
 122         fn_arg = "uint8_t (*" + fn_arg[18:] + ")[32]"
 123         assert var_is_arr_regex.match(fn_arg[8:])
 124         rust_obj = "LDKThirtyTwoBytes"
 125         arr_access = "data"
 126     elif fn_arg.startswith("LDKPublicKey"):
 127         fn_arg = "uint8_t (*" + fn_arg[13:] + ")[33]"
 128         assert var_is_arr_regex.match(fn_arg[8:])
 129         rust_obj = "LDKPublicKey"
 130         arr_access = "compressed_form"
 131     elif fn_arg.startswith("LDKSecretKey"):
 132         fn_arg = "uint8_t (*" + fn_arg[13:] + ")[32]"
 133         assert var_is_arr_regex.match(fn_arg[8:])
 134         rust_obj = "LDKSecretKey"
 135         arr_access = "bytes"
 136     elif fn_arg.startswith("LDKSignature"):
 137         fn_arg = "uint8_t (*" + fn_arg[13:] + ")[64]"
 138         assert var_is_arr_regex.match(fn_arg[8:])
 139         rust_obj = "LDKSignature"
 140         arr_access = "compact_form"
 141     elif fn_arg.startswith("LDKThreeBytes"):
 142         fn_arg = "uint8_t (*" + fn_arg[14:] + ")[3]"
 143         assert var_is_arr_regex.match(fn_arg[8:])
 144         rust_obj = "LDKThreeBytes"
 145         arr_access = "data"
 146     elif fn_arg.startswith("LDKFourBytes"):
 147         fn_arg = "uint8_t (*" + fn_arg[13:] + ")[4]"
 148         assert var_is_arr_regex.match(fn_arg[8:])
 149         rust_obj = "LDKFourBytes"
 150         arr_access = "data"
 151     elif fn_arg.startswith("LDKSixteenBytes"):
 152         fn_arg = "uint8_t (*" + fn_arg[16:] + ")[16]"
 153         assert var_is_arr_regex.match(fn_arg[8:])
 154         rust_obj = "LDKSixteenBytes"
 155         arr_access = "data"
 156     elif fn_arg.startswith("LDKTenBytes"):
 157         fn_arg = "uint8_t (*" + fn_arg[12:] + ")[10]"
 158         assert var_is_arr_regex.match(fn_arg[8:])
 159         rust_obj = "LDKTenBytes"
 160         arr_access = "data"
 161     elif fn_arg.startswith("LDKu8slice"):
 162         fn_arg = "uint8_t (*" + fn_arg[11:] + ")[datalen]"
 163         assert var_is_arr_regex.match(fn_arg[8:])
 164         rust_obj = "LDKu8slice"
 165         arr_access = "data"
 166     elif fn_arg.startswith("LDKCVecTempl_u8") or fn_arg.startswith("LDKCVec_u8Z"):
 167         if fn_arg.startswith("LDKCVecTempl_u8"):
 168             fn_arg = "uint8_t (*" + fn_arg[16:] + ")[datalen]"
 169             rust_obj = "LDKCVecTempl_u8"
 170             assert var_is_arr_regex.match(fn_arg[8:])
 171         else:
 172             fn_arg = "uint8_t (*" + fn_arg[12:] + ")[datalen]"
 173             rust_obj = "LDKCVec_u8Z"
 174             assert var_is_arr_regex.match(fn_arg[8:])
 175         arr_access = "data"
 176     elif fn_arg.startswith("LDKCVecTempl_") or fn_arg.startswith("LDKCVec_"):
 177         is_ptr = False
 178         if "*" in fn_arg:
 179             fn_arg = fn_arg.replace("*", "")
 180             is_ptr = True
 181
 182         if fn_arg.startswith("LDKCVec_"):
 183             tyn = fn_arg[8:].split(" ")
 184             assert tyn[0].endswith("Z")
 185             if tyn[0] == "u64Z":
 186                 new_arg = "uint64_t"
 187             else:
 188                 new_arg = "LDK" + tyn[0][:-1]
 189             for a in tyn[1:]:
 190                 new_arg = new_arg + " " + a
 191             res = java_c_types(new_arg, ret_arr_len)
 192         else:
 193             res = java_c_types("LDK" + fn_arg[13:], ret_arr_len)
 194         if res is None:
 195             assert java_c_types_none_allowed
 196             return None
 197         if is_ptr:
 198             res.pass_by_ref = True
 199         if res.is_native_primitive or res.passed_as_ptr:
 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=res.c_ty + "Array", 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         else:
 204             return TypeInfo(rust_obj=fn_arg.split(" ")[0], java_ty=res.java_ty + "[]", java_hu_ty=res.java_hu_ty + "[]",
 205                 java_fn_ty_arg="[" + res.java_fn_ty_arg, c_ty="jobjectArray", passed_as_ptr=False, is_ptr=is_ptr,
 206                 var_name=res.var_name, arr_len="datalen", arr_access="data", subty=res, is_native_primitive=False)
 207
 208     is_primitive = False
 209     arr_len = None
 210     if fn_arg.startswith("void"):
 211         java_ty = "void"
 212         c_ty = "void"
 213         fn_ty_arg = "V"
 214         fn_arg = fn_arg[4:].strip()
 215         is_primitive = True
 216     elif fn_arg.startswith("bool"):
 217         java_ty = "boolean"
 218         c_ty = "jboolean"
 219         fn_ty_arg = "Z"
 220         fn_arg = fn_arg[4:].strip()
 221         is_primitive = True
 222     elif fn_arg.startswith("uint8_t"):
 223         java_ty = "byte"
 224         c_ty = "jbyte"
 225         fn_ty_arg = "B"
 226         fn_arg = fn_arg[7:].strip()
 227         is_primitive = True
 228     elif fn_arg.startswith("uint16_t"):
 229         java_ty = "short"
 230         c_ty = "jshort"
 231         fn_ty_arg = "S"
 232         fn_arg = fn_arg[8:].strip()
 233         is_primitive = True
 234     elif fn_arg.startswith("uint32_t"):
 235         java_ty = "int"
 236         c_ty = "jint"
 237         fn_ty_arg = "I"
 238         fn_arg = fn_arg[8:].strip()
 239         is_primitive = True
 240     elif fn_arg.startswith("uint64_t") or fn_arg.startswith("uintptr_t"):
 241         java_ty = "long"
 242         c_ty = "jlong"
 243         fn_ty_arg = "J"
 244         if fn_arg.startswith("uint64_t"):
 245             fn_arg = fn_arg[8:].strip()
 246         else:
 247             fn_arg = fn_arg[9:].strip()
 248         is_primitive = True
 249     elif is_const and fn_arg.startswith("char *"):
 250         java_ty = "String"
 251         c_ty = "const char*"
 252         fn_ty_arg = "Ljava/lang/String;"
 253         fn_arg = fn_arg[6:].strip()
 254     elif fn_arg.startswith("LDKStr"):
 255         java_ty = "String"
 256         c_ty = "jstring"
 257         fn_ty_arg = "Ljava/lang/String;"
 258         fn_arg = fn_arg[6:].strip()
 259         arr_access = "chars"
 260         arr_len = "len"
 261     else:
 262         ma = var_ty_regex.match(fn_arg)
 263         if ma.group(1).strip() in unitary_enums:
 264             java_ty = ma.group(1).strip()
 265             c_ty = "jclass"
 266             fn_ty_arg = "Lorg/ldk/enums/" + ma.group(1).strip() + ";"
 267             fn_arg = ma.group(2).strip()
 268             rust_obj = ma.group(1).strip()
 269             take_by_ptr = True
 270         elif ma.group(1).strip().startswith("LDKC2Tuple"):
 271             java_ty = "long"
 272             java_hu_ty = "TwoTuple<"
 273             if not ma.group(1).strip() in tuple_types:
 274                 assert java_c_types_none_allowed
 275                 return None
 276             for idx, ty_info in enumerate(tuple_types[ma.group(1).strip()][0]):
 277                 if idx != 0:
 278                     java_hu_ty = java_hu_ty + ", "
 279                 if ty_info.is_native_primitive:
 280                     java_hu_ty = java_hu_ty + ty_info.java_hu_ty.title() # If we're a primitive, capitalize the first letter
 281                 else:
 282                     java_hu_ty = java_hu_ty + ty_info.java_hu_ty
 283             java_hu_ty = java_hu_ty + ">"
 284             c_ty = "jlong"
 285             fn_ty_arg = "J"
 286             fn_arg = ma.group(2).strip()
 287             rust_obj = ma.group(1).strip()
 288             take_by_ptr = True
 289         elif ma.group(1).strip().startswith("LDKC3Tuple"):
 290             java_ty = "long"
 291             java_hu_ty = "ThreeTuple<"
 292             if not ma.group(1).strip() in tuple_types:
 293                 assert java_c_types_none_allowed
 294                 return None
 295             for idx, ty_info in enumerate(tuple_types[ma.group(1).strip()][0]):
 296                 if idx != 0:
 297                     java_hu_ty = java_hu_ty + ", "
 298                 if ty_info.is_native_primitive:
 299                     java_hu_ty = java_hu_ty + ty_info.java_hu_ty.title() # If we're a primitive, capitalize the first letter
 300                 else:
 301                     java_hu_ty = java_hu_ty + ty_info.java_hu_ty
 302             java_hu_ty = java_hu_ty + ">"
 303             c_ty = "jlong"
 304             fn_ty_arg = "J"
 305             fn_arg = ma.group(2).strip()
 306             rust_obj = ma.group(1).strip()
 307             take_by_ptr = True
 308         else:
 309             java_ty = "long"
 310             java_hu_ty = ma.group(1).strip().replace("LDKCResult", "Result").replace("LDK", "")
 311             c_ty = "jlong"
 312             fn_ty_arg = "J"
 313             fn_arg = ma.group(2).strip()
 314             rust_obj = ma.group(1).strip()
 315             take_by_ptr = True
 316
 317     if fn_arg.startswith(" *") or fn_arg.startswith("*"):
 318         fn_arg = fn_arg.replace("*", "").strip()
 319         is_ptr = True
 320         c_ty = "jlong"
 321         java_ty = "long"
 322         fn_ty_arg = "J"
 323         is_primitive = False
 324
 325     var_is_arr = var_is_arr_regex.match(fn_arg)
 326     if var_is_arr is not None or ret_arr_len is not None:
 327         assert(not take_by_ptr)
 328         assert(not is_ptr)
 329         java_ty = java_ty + "[]"
 330         c_ty = c_ty + "Array"
 331         if var_is_arr is not None:
 332             if var_is_arr.group(1) == "":
 333                 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,
 334                     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)
 335             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,
 336                 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)
 337
 338     if java_hu_ty is None:
 339         java_hu_ty = java_ty
 340     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,
 341         is_ptr=is_ptr, var_name=fn_arg, arr_len=arr_len, arr_access=arr_access, is_native_primitive=is_primitive)
 342
 343 fn_ptr_regex = re.compile("^extern const ([A-Za-z_0-9\* ]*) \(\*(.*)\)\((.*)\);$")
 344 fn_ret_arr_regex = re.compile("(.*) \(\*(.*)\((.*)\)\)\[([0-9]*)\];$")
 345 reg_fn_regex = re.compile("([A-Za-z_0-9\* ]* \*?)([a-zA-Z_0-9]*)\((.*)\);$")
 346 clone_fns = set()
 347 constructor_fns = {}
 348 with open(sys.argv[1]) as in_h:
 349     for line in in_h:
 350         reg_fn = reg_fn_regex.match(line)
 351         if reg_fn is not None:
 352             if reg_fn.group(2).endswith("_clone"):
 353                 clone_fns.add(reg_fn.group(2))
 354             else:
 355                 rty = java_c_types(reg_fn.group(1), None)
 356                 if rty is not None and rty.rust_obj is not None and reg_fn.group(2) == rty.java_hu_ty + "_new":
 357                     constructor_fns[rty.rust_obj] = reg_fn.group(3)
 358             continue
 359         arr_fn = fn_ret_arr_regex.match(line)
 360         if arr_fn is not None:
 361             if arr_fn.group(2).endswith("_clone"):
 362                 clone_fns.add(arr_fn.group(2))
 363             # No object constructors return arrays, as then they wouldn't be an object constructor
 364             continue
 365 java_c_types_none_allowed = False # C structs created by cbindgen are declared in dependency order
 366
 367 with open(sys.argv[1]) as in_h, open(sys.argv[2], "w") as out_java, open(sys.argv[4], "w") as out_c:
 368     def map_type(fn_arg, print_void, ret_arr_len, is_free, holds_ref):
 369         ty_info = java_c_types(fn_arg, ret_arr_len)
 370         return map_type_with_info(ty_info, print_void, ret_arr_len, is_free, holds_ref)
 371
 372     def map_type_with_info(ty_info, print_void, ret_arr_len, is_free, holds_ref):
 373         if ty_info.c_ty == "void":
 374             if not print_void:
 375                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 376                     arg_conv = None, arg_conv_name = None, arg_conv_cleanup = None,
 377                     ret_conv = None, ret_conv_name = None, to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 378         if ty_info.c_ty.endswith("Array"):
 379             arr_len = ty_info.arr_len
 380             if arr_len is not None:
 381                 arr_name = ty_info.var_name
 382             else:
 383                 arr_name = "ret"
 384                 arr_len = ret_arr_len
 385             if ty_info.c_ty == "jbyteArray":
 386                 ret_conv = ("jbyteArray " + arr_name + "_arr = (*_env)->NewByteArray(_env, " + arr_len + ");\n" + "(*_env)->SetByteArrayRegion(_env, " + arr_name + "_arr, 0, " + arr_len + ", ", "")
 387                 arg_conv_cleanup = None
 388                 if not arr_len.isdigit():
 389                     arg_conv = ty_info.rust_obj + " " + arr_name + "_ref;\n"
 390                     arg_conv = arg_conv + arr_name + "_ref." + ty_info.arr_access + " = (*_env)->GetByteArrayElements (_env, " + arr_name + ", NULL);\n"
 391                     arg_conv = arg_conv + arr_name + "_ref." + arr_len + " = (*_env)->GetArrayLength (_env, " + arr_name + ");"
 392                     arg_conv_cleanup = "(*_env)->ReleaseByteArrayElements(_env, " + arr_name + ", (int8_t*)" + arr_name + "_ref." + ty_info.arr_access + ", 0);"
 393                     ret_conv = (ty_info.rust_obj + " " + arr_name + "_var = ", "")
 394                     ret_conv = (ret_conv[0], ";\njbyteArray " + arr_name + "_arr = (*_env)->NewByteArray(_env, " + arr_name + "_var." + arr_len + ");\n")
 395                     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 + ");")
 396                     if not holds_ref and ty_info.rust_obj == "LDKCVec_u8Z":
 397                         ret_conv = (ret_conv[0], ret_conv[1] + "\nCVec_u8Z_free(" + arr_name + "_var);")
 398                 elif ty_info.rust_obj is not None:
 399                     arg_conv = ty_info.rust_obj + " " + arr_name + "_ref;\n"
 400                     arg_conv = arg_conv + "CHECK((*_env)->GetArrayLength (_env, " + arr_name + ") == " + arr_len + ");\n"
 401                     arg_conv = arg_conv + "(*_env)->GetByteArrayRegion (_env, " + arr_name + ", 0, " + arr_len + ", " + arr_name + "_ref." + ty_info.arr_access + ");"
 402                     ret_conv = (ret_conv[0], "." + ty_info.arr_access + ");")
 403                 else:
 404                     arg_conv = "unsigned char " + arr_name + "_arr[" + arr_len + "];\n"
 405                     arg_conv = arg_conv + "CHECK((*_env)->GetArrayLength (_env, " + arr_name + ") == " + arr_len + ");\n"
 406                     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;"
 407                     ret_conv = (ret_conv[0] + "*", ");")
 408                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 409                     arg_conv = arg_conv, arg_conv_name = arr_name + "_ref", arg_conv_cleanup = arg_conv_cleanup,
 410                     ret_conv = ret_conv, ret_conv_name = arr_name + "_arr", to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 411             else:
 412                 assert not arr_len.isdigit() # fixed length arrays not implemented
 413                 assert ty_info.java_ty[len(ty_info.java_ty) - 2:] == "[]"
 414                 conv_name = "arr_conv_" + str(len(ty_info.java_hu_ty))
 415                 idxc = chr(ord('a') + (len(ty_info.java_hu_ty) % 26))
 416                 ty_info.subty.var_name = conv_name
 417                 subty = map_type_with_info(ty_info.subty, False, None, is_free, holds_ref)
 418                 if arr_name == "":
 419                     arr_name = "arg"
 420                 arg_conv = ty_info.rust_obj + " " + arr_name + "_constr;\n"
 421                 arg_conv = arg_conv + arr_name + "_constr." + arr_len + " = (*_env)->GetArrayLength (_env, " + arr_name + ");\n"
 422                 arg_conv = arg_conv + "if (" + arr_name + "_constr." + arr_len + " > 0)\n"
 423                 if subty.rust_obj is None:
 424                     szof = subty.c_ty
 425                 else:
 426                     szof = subty.rust_obj
 427                 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"
 428                 arg_conv = arg_conv + "else\n"
 429                 arg_conv = arg_conv + "\t" + arr_name + "_constr." + ty_info.arr_access + " = NULL;\n"
 430                 if not ty_info.java_ty[:len(ty_info.java_ty) - 2].endswith("[]"):
 431                     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"
 432                 arg_conv = arg_conv + "for (size_t " + idxc + " = 0; " + idxc + " < " + arr_name + "_constr." + arr_len + "; " + idxc + "++) {\n"
 433                 if not ty_info.java_ty[:len(ty_info.java_ty) - 2].endswith("[]"):
 434                     arg_conv = arg_conv + "\t" + ty_info.java_ty.strip("[]") + " " + conv_name + " = " + arr_name + "_vals[" + idxc + "];"
 435                     if subty.arg_conv is not None:
 436                         arg_conv = arg_conv + "\n\t" + subty.arg_conv.replace("\n", "\n\t")
 437                 else:
 438                     arg_conv = arg_conv + "\tjobject " + conv_name + " = (*_env)->GetObjectArrayElement(_env, " + arr_name + ", " + idxc + ");\n"
 439                     arg_conv = arg_conv + "\t" + subty.arg_conv.replace("\n", "\n\t")
 440                 arg_conv = arg_conv + "\n\t" + arr_name + "_constr." + ty_info.arr_access + "[" + idxc + "] = " + subty.arg_conv_name + ";\n}"
 441                 if not ty_info.java_ty[:len(ty_info.java_ty) - 2].endswith("[]"):
 442                     arg_conv = arg_conv + "\n(*_env)->Release" + ty_info.java_ty.strip("[]").title() + "ArrayElements (_env, " + arr_name + ", " + arr_name + "_vals, 0);"
 443                 if ty_info.is_ptr:
 444                     arg_conv_name = "&" + arr_name + "_constr"
 445                 else:
 446                     arg_conv_name = arr_name + "_constr"
 447                 arg_conv_cleanup = None
 448                 if ty_info.is_ptr:
 449                     arg_conv_cleanup = "FREE(" + arr_name + "_constr." + ty_info.arr_access + ");"
 450
 451                 if arr_name == "arg":
 452                     arr_name = "ret"
 453                 ret_conv = (ty_info.rust_obj + " " + arr_name + "_var = ", "")
 454                 if subty.ret_conv is None:
 455                     ret_conv = ("DUMMY", "DUMMY")
 456                 elif not ty_info.java_ty[:len(ty_info.java_ty) - 2].endswith("[]"):
 457                     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")
 458                     ret_conv = (ret_conv[0], ret_conv[1] + subty.c_ty + " *" + arr_name + "_arr_ptr = (*_env)->GetPrimitiveArrayCritical(_env, " + arr_name + "_arr, NULL);\n")
 459                     ret_conv = (ret_conv[0], ret_conv[1] + "for (size_t " + idxc + " = 0; " + idxc + " < " + arr_name + "_var." + arr_len + "; " + idxc + "++) {\n")
 460                     ret_conv = (ret_conv[0], ret_conv[1] + "\t" + subty.ret_conv[0].replace("\n", "\n\t"))
 461                     ret_conv = (ret_conv[0], ret_conv[1] + arr_name + "_var." + ty_info.arr_access + "[" + idxc + "]" + subty.ret_conv[1].replace("\n", "\n\t"))
 462                     ret_conv = (ret_conv[0], ret_conv[1] + "\n\t" + arr_name + "_arr_ptr[" + idxc + "] = " + subty.ret_conv_name + ";\n")
 463                     ret_conv = (ret_conv[0], ret_conv[1] + "}\n(*_env)->ReleasePrimitiveArrayCritical(_env, " + arr_name + "_arr, " + arr_name + "_arr_ptr, 0);")
 464                 else:
 465                     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!
 466                     ret_conv = (ret_conv[0], ret_conv[1] + "for (size_t " + idxc + " = 0; " + idxc + " < " + arr_name + "_var." + arr_len + "; " + idxc + "++) {\n")
 467                     ret_conv = (ret_conv[0], ret_conv[1] + "\t" + subty.ret_conv[0].replace("\n", "\n\t"))
 468                     ret_conv = (ret_conv[0], ret_conv[1] + arr_name + "_var." + ty_info.arr_access + "[" + idxc + "]" + subty.ret_conv[1].replace("\n", "\n\t"))
 469                     ret_conv = (ret_conv[0], ret_conv[1] + "\n\t(*_env)->SetObjectArrayElement(_env, " + arr_name + "_arr, " + idxc + ", " + subty.ret_conv_name + ");\n")
 470                     ret_conv = (ret_conv[0], ret_conv[1] + "}")
 471                 if not holds_ref:
 472                     if subty.rust_obj is not None and subty.rust_obj in opaque_structs:
 473                         ret_conv = (ret_conv[0], ret_conv[1] + "\nFREE(" + arr_name + "_var." + ty_info.arr_access + ");")
 474                     else:
 475                         ret_conv = (ret_conv[0], ret_conv[1] + "\n" + ty_info.rust_obj.replace("LDK", "") + "_free(" + arr_name + "_var);")
 476
 477                 to_hu_conv = None
 478                 to_hu_conv_name = None
 479                 if subty.to_hu_conv is not None:
 480                     to_hu_conv = ty_info.java_hu_ty + " " + conv_name + "_arr = new " + ty_info.subty.java_hu_ty.split("<")[0] + "[" + arr_name + ".length];\n"
 481                     to_hu_conv = to_hu_conv + "for (int " + idxc + " = 0; " + idxc + " < " + arr_name + ".length; " + idxc + "++) {\n"
 482                     to_hu_conv = to_hu_conv + "\t" + subty.java_ty + " " + conv_name + " = " + arr_name + "[" + idxc + "];\n"
 483                     to_hu_conv = to_hu_conv + "\t" + subty.to_hu_conv.replace("\n", "\n\t") + "\n"
 484                     to_hu_conv = to_hu_conv + "\t" + conv_name + "_arr[" + idxc + "] = " + subty.to_hu_conv_name + ";\n}"
 485                     to_hu_conv_name = conv_name + "_arr"
 486                 from_hu_conv = None
 487                 if subty.from_hu_conv is not None:
 488                     if subty.java_ty == "long" and subty.java_hu_ty != "long":
 489                         from_hu_conv = ("Arrays.stream(" + arr_name + ").mapToLong(" + conv_name + " -> " + subty.from_hu_conv[0] + ").toArray()", "/* TODO 2 " + subty.java_hu_ty + "  */")
 490                     elif subty.java_ty == "long":
 491                         from_hu_conv = ("Arrays.stream(" + arr_name + ").map(" + conv_name + " -> " + subty.from_hu_conv[0] + ").toArray()", "/* TODO 2 " + subty.java_hu_ty + "  */")
 492                     else:
 493                         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 + "  */")
 494
 495                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 496                     arg_conv = arg_conv, arg_conv_name = arg_conv_name, arg_conv_cleanup = arg_conv_cleanup,
 497                     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)
 498         elif ty_info.java_ty == "String":
 499             if ty_info.arr_access is None:
 500                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 501                     arg_conv = None, arg_conv_name = None, arg_conv_cleanup = None,
 502                     ret_conv = ("jstring " + ty_info.var_name + "_conv = (*_env)->NewStringUTF(_env, ", ");"), ret_conv_name = ty_info.var_name + "_conv",
 503                     to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 504             else:
 505                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 506                     arg_conv = None, arg_conv_name = None, arg_conv_cleanup = None,
 507                     ret_conv = ("LDKStr " + ty_info.var_name + "_str = ",
 508                         ";\nchar* " + ty_info.var_name + "_buf = MALLOC(" + ty_info.var_name + "_str." + ty_info.arr_len + " + 1, \"str conv buf\");\n" +
 509                         "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" +
 510                         ty_info.var_name + "_buf[" + ty_info.var_name + "_str." + ty_info.arr_len + "] = 0;\n" +
 511                         "jstring " + ty_info.var_name + "_conv = (*_env)->NewStringUTF(_env, " + ty_info.var_name + "_str." + ty_info.arr_access + ");\n" +
 512                         "FREE(" + ty_info.var_name + "_buf);"),
 513                     ret_conv_name = ty_info.var_name + "_conv", to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 514         elif ty_info.var_name != "":
 515             # If we have a parameter name, print it (noting that it may indicate its a pointer)
 516             if ty_info.rust_obj is not None:
 517                 assert(ty_info.passed_as_ptr)
 518                 opaque_arg_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv;\n"
 519                 opaque_arg_conv = opaque_arg_conv + ty_info.var_name + "_conv.inner = (void*)(" + ty_info.var_name + " & (~1));\n"
 520                 opaque_arg_conv = opaque_arg_conv + ty_info.var_name + "_conv.is_owned = (" + ty_info.var_name + " & 1) || (" + ty_info.var_name + " == 0);"
 521                 if not ty_info.is_ptr and not is_free and not ty_info.pass_by_ref:
 522                     if (ty_info.java_hu_ty + "_clone") in clone_fns:
 523                         # 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.
 524                         opaque_arg_conv = opaque_arg_conv + "\nif (" + ty_info.var_name + "_conv.inner != NULL)\n"
 525                         opaque_arg_conv = opaque_arg_conv + "\t" + ty_info.var_name + "_conv = " + ty_info.java_hu_ty + "_clone(&" + ty_info.var_name + "_conv);"
 526                     elif ty_info.passed_as_ptr:
 527                         opaque_arg_conv = opaque_arg_conv + "\n// Warning: we may need a move here but can't clone!"
 528                 if not ty_info.is_ptr:
 529                     if ty_info.rust_obj in unitary_enums:
 530                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 531                             arg_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv = " + ty_info.rust_obj + "_from_java(_env, " + ty_info.var_name + ");",
 532                             arg_conv_name = ty_info.var_name + "_conv",
 533                             arg_conv_cleanup = None,
 534                             ret_conv = ("jclass " + ty_info.var_name + "_conv = " + ty_info.rust_obj + "_to_java(_env, ", ");"),
 535                             ret_conv_name = ty_info.var_name + "_conv", to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 536                     if ty_info.rust_obj in opaque_structs:
 537                         ret_conv_suf = ";\nCHECK((((long)" + ty_info.var_name + "_var.inner) & 1) == 0); // We rely on a free low bit, malloc guarantees this.\n"
 538                         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"
 539                         if holds_ref:
 540                             ret_conv_suf = ret_conv_suf + "long " + ty_info.var_name + "_ref = (long)" + ty_info.var_name + "_var.inner & ~1;"
 541                         else:
 542                             ret_conv_suf = ret_conv_suf + "long " + ty_info.var_name + "_ref;\n"
 543                             ret_conv_suf = ret_conv_suf + "if (" + ty_info.var_name + "_var.is_owned) {\n"
 544                             ret_conv_suf = ret_conv_suf + "\t" + ty_info.var_name + "_ref = (long)" + ty_info.var_name + "_var.inner | 1;\n"
 545                             ret_conv_suf = ret_conv_suf + "} else {\n"
 546                             ret_conv_suf = ret_conv_suf + "\t" + ty_info.var_name + "_ref = (long)" + ty_info.var_name + "_var.inner & ~1;\n"
 547                             ret_conv_suf = ret_conv_suf + "}"
 548                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 549                             arg_conv = opaque_arg_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 550                             ret_conv = (ty_info.rust_obj + " " + ty_info.var_name + "_var = ", ret_conv_suf),
 551                             ret_conv_name = ty_info.var_name + "_ref",
 552                             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 + ");",
 553                             to_hu_conv_name = ty_info.var_name + "_hu_conv",
 554                             from_hu_conv = (ty_info.var_name + " == null ? 0 : " + ty_info.var_name + ".ptr & ~1", "this.ptrs_to.add(" + ty_info.var_name + ")"))
 555                     base_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv = *(" + ty_info.rust_obj + "*)" + ty_info.var_name + ";";
 556                     if ty_info.rust_obj in trait_structs:
 557                         if not is_free:
 558                             base_conv = base_conv + "\nif (" + ty_info.var_name + "_conv.free == " + ty_info.rust_obj + "_JCalls_free) {\n"
 559                             base_conv = base_conv + "\t// If this_arg is a JCalls struct, then we need to increment the refcnt in it.\n"
 560                             base_conv = base_conv + "\t" + ty_info.rust_obj + "_JCalls_clone(" + ty_info.var_name + "_conv.this_arg);\n}"
 561                         else:
 562                             base_conv = base_conv + "\n" + "FREE((void*)" + ty_info.var_name + ");"
 563                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 564                             arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 565                             ret_conv = ("CANT PASS TRAIT TO Java?", ""), ret_conv_name = "NO CONV POSSIBLE",
 566                             to_hu_conv = "DUMMY", to_hu_conv_name = None,
 567                             from_hu_conv = (ty_info.var_name + " == null ? 0 : " + ty_info.var_name + ".ptr", "this.ptrs_to.add(" + ty_info.var_name + ")"))
 568                     if ty_info.rust_obj != "LDKu8slice" and ty_info.rust_obj != "LDKTransaction":
 569                         # Don't bother free'ing slices passed in - Rust doesn't auto-free the
 570                         # underlying unlike Vecs, and it gives Java more freedom.
 571                         base_conv = base_conv + "\nFREE((void*)" + ty_info.var_name + ");";
 572                     if ty_info.rust_obj in complex_enums:
 573                         ret_conv = ("long " + ty_info.var_name + "_ref = (long)&", ";")
 574                         if not ty_info.is_ptr and not holds_ref and (ty_info.java_hu_ty + "_clone") in clone_fns:
 575                             ret_conv = (ty_info.rust_obj + " *" + ty_info.var_name + "_copy = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n", "")
 576                             ret_conv = (ret_conv[0] + "*" + ty_info.var_name + "_copy = " + ty_info.java_hu_ty + "_clone(&", ");\n")
 577                             ret_conv = (ret_conv[0], ret_conv[1] + "long " + ty_info.var_name + "_ref = (long)" + ty_info.var_name + "_copy;")
 578                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 579                             arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 580                             ret_conv = ret_conv, ret_conv_name = ty_info.var_name + "_ref",
 581                             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 + ");",
 582                             to_hu_conv_name = ty_info.var_name + "_hu_conv", from_hu_conv = (ty_info.var_name + ".ptr", ""))
 583                     if ty_info.rust_obj in tuple_types:
 584                         from_hu_conv = "bindings." + tuple_types[ty_info.rust_obj][1].replace("LDK", "") + "_new("
 585                         to_hu_conv_pfx = ""
 586                         to_hu_conv_sfx = ty_info.java_hu_ty + " " + ty_info.var_name + "_conv = new " + ty_info.java_hu_ty + "("
 587                         for idx, conv in enumerate(tuple_types[ty_info.rust_obj][0]):
 588                             if idx != 0:
 589                                 to_hu_conv_sfx = to_hu_conv_sfx + ", "
 590                                 from_hu_conv = from_hu_conv + ", "
 591                             conv.var_name = ty_info.var_name + "_" + chr(idx + ord("a"))
 592                             conv_map = map_type_with_info(conv, False, None, is_free, holds_ref)
 593                             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"
 594                             if conv_map.to_hu_conv is not None:
 595                                 to_hu_conv_pfx = to_hu_conv_pfx + conv_map.to_hu_conv + ";\n"
 596                                 to_hu_conv_sfx = to_hu_conv_sfx + conv_map.to_hu_conv_name
 597                             else:
 598                                 to_hu_conv_sfx = to_hu_conv_sfx + ty_info.var_name + "_" + chr(idx + ord("a"))
 599                             if conv_map.from_hu_conv is not None:
 600                                 from_hu_conv = from_hu_conv + conv_map.from_hu_conv[0].replace(ty_info.var_name + "_" + chr(idx + ord("a")), ty_info.var_name + "." + chr(idx + ord("a")))
 601                                 if conv_map.from_hu_conv[1] != "":
 602                                     from_hu_conv = from_hu_conv + "/*XXX: Need to call " + conv_map.from_hu_conv[1] + "*/"
 603                             else:
 604                                 from_hu_conv = from_hu_conv + ty_info.var_name + "." + chr(idx + ord("a"))
 605                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 606                             arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 607                             ret_conv = ("long " + ty_info.var_name + "_ref = (long)&", ";"), ret_conv_name = ty_info.var_name + "_ref",
 608                             to_hu_conv = to_hu_conv_pfx + to_hu_conv_sfx + ");", to_hu_conv_name = ty_info.var_name + "_conv", from_hu_conv = (from_hu_conv + ")", ""))
 609
 610                     # The manually-defined types - TxOut and Transaction
 611                     assert ty_info.rust_obj == "LDKTransaction" or ty_info.rust_obj == "LDKTxOut"
 612                     if ty_info.rust_obj == "LDKTransaction":
 613                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 614                             arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 615                             ret_conv = ("LDKTransaction *" + ty_info.var_name + "_copy = MALLOC(sizeof(LDKTransaction), \"LDKTransaction\");\n*" + ty_info.var_name + "_copy = ", ";\nlong " + ty_info.var_name + "_ref = (long)" + ty_info.var_name + "_copy;"),
 616                             ret_conv_name = ty_info.var_name + "_ref",
 617                             to_hu_conv = ty_info.java_hu_ty + " " + ty_info.var_name + "_conv = new " +ty_info.java_hu_ty + "(null, " + ty_info.var_name + ");",
 618                             to_hu_conv_name = ty_info.var_name + "_conv", from_hu_conv = (ty_info.var_name + ".ptr", ""))
 619                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 620                             arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 621                             ret_conv = ("long " + ty_info.var_name + "_ref = (long)&", ";"), ret_conv_name = ty_info.var_name + "_ref",
 622                             to_hu_conv = ty_info.java_hu_ty + " " + ty_info.var_name + "_conv = new " +ty_info.java_hu_ty + "(null, " + ty_info.var_name + ");",
 623                             to_hu_conv_name = ty_info.var_name + "_conv", from_hu_conv = (ty_info.var_name + ".ptr", ""))
 624                 else:
 625                     assert(not is_free)
 626                     if ty_info.rust_obj in opaque_structs:
 627                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 628                             arg_conv = opaque_arg_conv, arg_conv_name = "&" + ty_info.var_name + "_conv", arg_conv_cleanup = None,
 629                             ret_conv = None, ret_conv_name = None,
 630                             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 + ");",
 631                             to_hu_conv_name = ty_info.var_name + "_hu_conv",
 632                             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
 633                     elif ty_info.rust_obj in complex_enums:
 634                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 635                             arg_conv = ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)" + ty_info.var_name + ";",
 636                             arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 637                             ret_conv = None, ret_conv_name = None,
 638                             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 + ");",
 639                             to_hu_conv_name = ty_info.var_name + "_hu_conv",
 640                             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
 641                     elif ty_info.rust_obj in trait_structs:
 642                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 643                             arg_conv = ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)" + ty_info.var_name + ";",
 644                             arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 645                             ret_conv = None, ret_conv_name = None, to_hu_conv = "TODO 2.5", to_hu_conv_name = None,
 646                             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
 647                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 648                         arg_conv = ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)" + ty_info.var_name + ";",
 649                         arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 650                         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
 651             elif ty_info.is_ptr:
 652                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 653                     arg_conv = None, arg_conv_name = ty_info.var_name, arg_conv_cleanup = None,
 654                     ret_conv = None, ret_conv_name = None, to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 655             else:
 656                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 657                     arg_conv = None, arg_conv_name = ty_info.var_name, arg_conv_cleanup = None,
 658                     ret_conv = None, ret_conv_name = None, to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 659         elif not print_void:
 660             # We don't have a parameter name, and want one, just call it arg
 661             if ty_info.rust_obj is not None:
 662                 assert(not is_free or ty_info.rust_obj not in opaque_structs)
 663                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 664                     arg_conv = ty_info.rust_obj + " arg_conv = *(" + ty_info.rust_obj + "*)arg;\nFREE((void*)arg);",
 665                     arg_conv_name = "arg_conv", arg_conv_cleanup = None,
 666                     ret_conv = None, ret_conv_name = None, to_hu_conv = "TODO 7", to_hu_conv_name = None, from_hu_conv = None)
 667             else:
 668                 assert(not is_free)
 669                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 670                     arg_conv = None, arg_conv_name = "arg", arg_conv_cleanup = None,
 671                     ret_conv = None, ret_conv_name = None, to_hu_conv = "TODO 8", to_hu_conv_name = None, from_hu_conv = None)
 672         else:
 673             # We don't have a parameter name, and don't want one (cause we're returning)
 674             if ty_info.rust_obj is not None:
 675                 if not ty_info.is_ptr:
 676                     if ty_info.rust_obj in unitary_enums:
 677                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 678                             arg_conv = ty_info.rust_obj + " ret_conv = " + ty_info.rust_obj + "_from_java(_env, ret);",
 679                             arg_conv_name = "ret_conv", arg_conv_cleanup = None,
 680                             ret_conv = ("jclass ret = " + ty_info.rust_obj + "_to_java(_env, ", ");"), ret_conv_name = "ret",
 681                             to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 682                     if ty_info.rust_obj in complex_enums or ty_info.rust_obj in result_types:
 683                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 684                             ret_conv = (ty_info.rust_obj + "* ret = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n*ret = ", ";"),
 685                             ret_conv_name = "(long)ret",
 686                             arg_conv = None, arg_conv_name = None, arg_conv_cleanup = None,
 687                             to_hu_conv = ty_info.java_hu_ty + " ret_hu_conv = " + ty_info.java_hu_ty + ".constr_from_ptr(ret);\nret_hu_conv.ptrs_to.add(this);",
 688                             to_hu_conv_name = "ret_hu_conv", from_hu_conv = ("ret != null ? ret.ptr : 0", ""))
 689                     if ty_info.rust_obj in opaque_structs:
 690                         # If we're returning a newly-allocated struct, we don't want Rust to ever
 691                         # free, instead relying on the Java GC to lose the ref. We undo this in
 692                         # any _free function.
 693                         # To avoid any issues, we first assert that the incoming object is non-ref.
 694                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 695                             ret_conv = (ty_info.rust_obj + " ret = ", ";"),
 696                             ret_conv_name = "((long)ret.inner) | (ret.is_owned ? 1 : 0)",
 697                             arg_conv = None, arg_conv_name = None, arg_conv_cleanup = None,
 698                             to_hu_conv = ty_info.java_hu_ty + " ret_hu_conv = new " + ty_info.java_hu_ty + "(null, ret);",
 699                             to_hu_conv_name = "ret_hu_conv", from_hu_conv = None)
 700                     elif ty_info.rust_obj in trait_structs:
 701                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 702                             ret_conv = (ty_info.rust_obj + "* ret = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n*ret = ", ";"),
 703                             ret_conv_name = "(long)ret",
 704                             arg_conv = None, arg_conv_name = None, arg_conv_cleanup = None,
 705                             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);",
 706                             to_hu_conv_name = "ret_hu_conv", from_hu_conv = ("ret.ptr", ""))
 707                     elif ty_info.rust_obj in tuple_types:
 708                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 709                             ret_conv = (ty_info.rust_obj + "* ret = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n*ret = ", ";"),
 710                             ret_conv_name = "(long)ret",
 711                             arg_conv = None, arg_conv_name = None, arg_conv_cleanup = None,
 712                             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);",
 713                             to_hu_conv_name = "ret_hu_conv", from_hu_conv = ("bindings." + ty_info.rust_obj.replace("LDK", "") + "_new(ret.a, ret.b)", ""))
 714                     else:
 715                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 716                             ret_conv = (ty_info.rust_obj + "* ret = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n*ret = ", ";"),
 717                             ret_conv_name = "(long)ret",
 718                             arg_conv = None, arg_conv_name = None, arg_conv_cleanup = None,
 719                             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);",
 720                             to_hu_conv_name = "ret_hu_conv", from_hu_conv = None)
 721                 elif ty_info.rust_obj in trait_structs:
 722                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 723                         ret_conv = ("long ret = (long)", ";"), ret_conv_name = "ret",
 724                         arg_conv = None, arg_conv_name = None, arg_conv_cleanup = None,
 725                         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);",
 726                         to_hu_conv_name = "ret_hu_conv", from_hu_conv = None)
 727                 else:
 728                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 729                         ret_conv = ("long ret = (long)", ";"), ret_conv_name = "ret",
 730                         arg_conv = None, arg_conv_name = None, arg_conv_cleanup = None,
 731                         to_hu_conv = "TODO c", to_hu_conv_name = None, from_hu_conv = None)
 732             else:
 733                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 734                     arg_conv = None, arg_conv_name = None, arg_conv_cleanup = None,
 735                     ret_conv = None, ret_conv_name = None,
 736                     to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 737
 738     def map_fn(line, re_match, ret_arr_len, c_call_string):
 739         out_java.write("\t// " + line)
 740         out_java.write("\tpublic static native ")
 741         out_c.write("JNIEXPORT ")
 742
 743         is_free = re_match.group(2).endswith("_free")
 744         struct_meth = re_match.group(2).split("_")[0]
 745
 746         ret_info = map_type(re_match.group(1), True, ret_arr_len, False, False)
 747         ret_info.print_ty()
 748
 749         if ret_info.ret_conv is not None:
 750             ret_conv_pfx, ret_conv_sfx = ret_info.ret_conv
 751
 752         out_java.write(" " + re_match.group(2) + "(")
 753         out_c.write(" JNICALL Java_org_ldk_impl_bindings_" + re_match.group(2).replace('_', '_1') + "(JNIEnv * _env, jclass _b")
 754
 755         arg_names = []
 756         default_constructor_args = {}
 757         takes_self = False
 758         args_known = not ret_info.passed_as_ptr or ret_info.rust_obj in opaque_structs or ret_info.rust_obj in trait_structs or ret_info.rust_obj in complex_enums or ret_info.rust_obj in result_types
 759         for idx, arg in enumerate(re_match.group(3).split(',')):
 760             if idx != 0:
 761                 out_java.write(", ")
 762             if arg != "void":
 763                 out_c.write(", ")
 764             arg_conv_info = map_type(arg, False, None, is_free, False)
 765             if arg_conv_info.c_ty != "void":
 766                 arg_conv_info.print_ty()
 767                 arg_conv_info.print_name()
 768             if arg_conv_info.arg_name == "this_ptr" or arg_conv_info.arg_name == "this_arg":
 769                 takes_self = True
 770             if arg_conv_info.passed_as_ptr and not arg_conv_info.rust_obj in opaque_structs:
 771                 if not arg_conv_info.rust_obj in trait_structs and not arg_conv_info.rust_obj in unitary_enums:
 772                     args_known = False
 773             if arg_conv_info.arg_conv is not None and "Warning" in arg_conv_info.arg_conv:
 774                 if arg_conv_info.rust_obj in constructor_fns:
 775                     assert not is_free
 776                     for explode_arg in constructor_fns[arg_conv_info.rust_obj].split(','):
 777                         explode_arg_conv = map_type(explode_arg, False, None, False, False)
 778                         if explode_arg_conv.c_ty == "void":
 779                             # We actually want to handle this case, but for now its only used in NetGraphMsgHandler::new()
 780                             # which ends up resulting in a redundant constructor - both without arguments for the NetworkGraph.
 781                             args_known = False
 782                         assert explode_arg_conv.arg_name != "this_ptr"
 783                         assert explode_arg_conv.arg_name != "this_arg"
 784                         if explode_arg_conv.passed_as_ptr and not explode_arg_conv.rust_obj in trait_structs:
 785                             args_known = False
 786                         if not arg_conv_info.arg_name in default_constructor_args:
 787                             default_constructor_args[arg_conv_info.arg_name] = []
 788                         default_constructor_args[arg_conv_info.arg_name].append(explode_arg_conv)
 789                 else:
 790                     args_known = False
 791             arg_names.append(arg_conv_info)
 792
 793         out_java_struct = None
 794         if ("LDK" + struct_meth in opaque_structs or "LDK" + struct_meth in trait_structs) and not is_free:
 795             out_java_struct = open(sys.argv[3] + "/structs/" + struct_meth + ".java", "a")
 796             if not args_known:
 797                 out_java_struct.write("\t// Skipped " + re_match.group(2) + "\n")
 798                 out_java_struct.close()
 799                 out_java_struct = None
 800             else:
 801                 meth_n = re_match.group(2)[len(struct_meth) + 1:]
 802                 if ret_info.rust_obj == "LDK" + struct_meth:
 803                     out_java_struct.write("\tpublic static " + ret_info.java_hu_ty + " constructor_" + meth_n + "(")
 804                 else:
 805                     out_java_struct.write("\tpublic " + ret_info.java_hu_ty + " " + meth_n + "(")
 806                 for idx, arg in enumerate(arg_names):
 807                     if idx != 0:
 808                         if not takes_self or idx > 1:
 809                             out_java_struct.write(", ")
 810                     if arg.java_ty != "void" and arg.arg_name != "this_ptr" and arg.arg_name != "this_arg":
 811                         if arg.arg_name in default_constructor_args:
 812                             for explode_idx, explode_arg in enumerate(default_constructor_args[arg.arg_name]):
 813                                 if explode_idx != 0:
 814                                     out_java_struct.write(", ")
 815                                 assert explode_arg.rust_obj in opaque_structs or explode_arg.rust_obj in trait_structs
 816                                 out_java_struct.write(explode_arg.java_hu_ty + " " + arg.arg_name + "_" + explode_arg.arg_name)
 817                         else:
 818                             out_java_struct.write(arg.java_hu_ty + " " + arg.arg_name)
 819
 820
 821         out_java.write(");\n")
 822         out_c.write(") {\n")
 823         if out_java_struct is not None:
 824             out_java_struct.write(") {\n")
 825
 826         for info in arg_names:
 827             if info.arg_conv is not None:
 828                 out_c.write("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
 829
 830         if ret_info.ret_conv is not None:
 831             out_c.write("\t" + ret_conv_pfx.replace('\n', '\n\t'))
 832         elif ret_info.c_ty != "void":
 833             out_c.write("\t" + ret_info.c_ty + " ret_val = ")
 834         else:
 835             out_c.write("\t")
 836
 837         if c_call_string is None:
 838             out_c.write(re_match.group(2) + "(")
 839         else:
 840             out_c.write(c_call_string)
 841         for idx, info in enumerate(arg_names):
 842             if info.arg_conv_name is not None:
 843                 if idx != 0:
 844                     out_c.write(", ")
 845                 elif c_call_string is not None:
 846                     continue
 847                 out_c.write(info.arg_conv_name)
 848         out_c.write(")")
 849         if ret_info.ret_conv is not None:
 850             out_c.write(ret_conv_sfx.replace('\n', '\n\t'))
 851         else:
 852             out_c.write(";")
 853         for info in arg_names:
 854             if info.arg_conv_cleanup is not None:
 855                 out_c.write("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
 856         if ret_info.ret_conv is not None:
 857             out_c.write("\n\treturn " + ret_info.ret_conv_name + ";")
 858         elif ret_info.c_ty != "void":
 859             out_c.write("\n\treturn ret_val;")
 860         out_c.write("\n}\n\n")
 861         if out_java_struct is not None:
 862             out_java_struct.write("\t\t")
 863             if ret_info.java_ty != "void":
 864                 out_java_struct.write(ret_info.java_ty + " ret = ")
 865             out_java_struct.write("bindings." + re_match.group(2) + "(")
 866             for idx, info in enumerate(arg_names):
 867                 if idx != 0:
 868                     out_java_struct.write(", ")
 869                 if info.arg_name == "this_ptr" or info.arg_name == "this_arg":
 870                     out_java_struct.write("this.ptr")
 871                 elif info.arg_name in default_constructor_args:
 872                     out_java_struct.write("bindings." + info.java_hu_ty + "_new(")
 873                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
 874                         if explode_idx != 0:
 875                             out_java_struct.write(", ")
 876                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
 877                         out_java_struct.write(explode_arg.from_hu_conv[0].replace(explode_arg.arg_name, expl_arg_name))
 878                     out_java_struct.write(")")
 879                 elif info.from_hu_conv is not None:
 880                     out_java_struct.write(info.from_hu_conv[0])
 881                 else:
 882                     out_java_struct.write(info.arg_name)
 883             out_java_struct.write(");\n")
 884             if ret_info.to_hu_conv is not None:
 885                 out_java_struct.write("\t\t" + ret_info.to_hu_conv.replace("\n", "\n\t\t") + "\n")
 886
 887             for info in arg_names:
 888                 if info.arg_name == "this_ptr" or info.arg_name == "this_arg":
 889                     pass
 890                 elif info.arg_name in default_constructor_args:
 891                     for explode_arg in default_constructor_args[info.arg_name]:
 892                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
 893                         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")
 894                 elif info.from_hu_conv is not None and info.from_hu_conv[1] != "":
 895                     if ret_info.rust_obj == "LDK" + struct_meth and ret_info.to_hu_conv_name is not None:
 896                         out_java_struct.write("\t\t" + info.from_hu_conv[1].replace("this", ret_info.to_hu_conv_name) + ";\n")
 897                     else:
 898                         out_java_struct.write("\t\t" + info.from_hu_conv[1] + ";\n")
 899
 900             if ret_info.to_hu_conv_name is not None:
 901                 out_java_struct.write("\t\treturn " + ret_info.to_hu_conv_name + ";\n")
 902             elif ret_info.java_ty != "void" and ret_info.rust_obj != "LDK" + struct_meth:
 903                 out_java_struct.write("\t\treturn ret;\n")
 904             out_java_struct.write("\t}\n\n")
 905             out_java_struct.close()
 906
 907     def map_unitary_enum(struct_name, field_lines):
 908         with open(sys.argv[3] + "/enums/" + struct_name + ".java", "w") as out_java_enum:
 909             out_java_enum.write("package org.ldk.enums;\n\n")
 910             unitary_enums.add(struct_name)
 911             out_c.write("static inline " + struct_name + " " + struct_name + "_from_java(JNIEnv *env, jclass val) {\n")
 912             out_c.write("\tswitch ((*env)->CallIntMethod(env, val, ordinal_meth)) {\n")
 913             ord_v = 0
 914             for idx, struct_line in enumerate(field_lines):
 915                 if idx == 0:
 916                     out_java_enum.write("public enum " + struct_name + " {\n")
 917                 elif idx == len(field_lines) - 3:
 918                     assert(struct_line.endswith("_Sentinel,"))
 919                 elif idx == len(field_lines) - 2:
 920                     out_java_enum.write("\t; static native void init();\n")
 921                     out_java_enum.write("\tstatic { init(); }\n")
 922                     out_java_enum.write("}")
 923                     out_java.write("\tstatic { " + struct_name + ".values(); /* Force enum statics to run */ }\n")
 924                 elif idx == len(field_lines) - 1:
 925                     assert(struct_line == "")
 926                 else:
 927                     out_java_enum.write(struct_line + "\n")
 928                     out_c.write("\t\tcase %d: return %s;\n" % (ord_v, struct_line.strip().strip(",")))
 929                     ord_v = ord_v + 1
 930             out_c.write("\t}\n")
 931             out_c.write("\tabort();\n")
 932             out_c.write("}\n")
 933
 934             ord_v = 0
 935             out_c.write("static jclass " + struct_name + "_class = NULL;\n")
 936             for idx, struct_line in enumerate(field_lines):
 937                 if idx > 0 and idx < len(field_lines) - 3:
 938                     variant = struct_line.strip().strip(",")
 939                     out_c.write("static jfieldID " + struct_name + "_" + variant + " = NULL;\n")
 940             out_c.write("JNIEXPORT void JNICALL Java_org_ldk_enums_" + struct_name.replace("_", "_1") + "_init (JNIEnv * env, jclass clz) {\n")
 941             out_c.write("\t" + struct_name + "_class = (*env)->NewGlobalRef(env, clz);\n")
 942             out_c.write("\tCHECK(" + struct_name + "_class != NULL);\n")
 943             for idx, struct_line in enumerate(field_lines):
 944                 if idx > 0 and idx < len(field_lines) - 3:
 945                     variant = struct_line.strip().strip(",")
 946                     out_c.write("\t" + struct_name + "_" + variant + " = (*env)->GetStaticFieldID(env, " + struct_name + "_class, \"" + variant + "\", \"Lorg/ldk/enums/" + struct_name + ";\");\n")
 947                     out_c.write("\tCHECK(" + struct_name + "_" + variant + " != NULL);\n")
 948             out_c.write("}\n")
 949             out_c.write("static inline jclass " + struct_name + "_to_java(JNIEnv *env, " + struct_name + " val) {\n")
 950             out_c.write("\tswitch (val) {\n")
 951             for idx, struct_line in enumerate(field_lines):
 952                 if idx > 0 and idx < len(field_lines) - 3:
 953                     variant = struct_line.strip().strip(",")
 954                     out_c.write("\t\tcase " + variant + ":\n")
 955                     out_c.write("\t\t\treturn (*env)->GetStaticObjectField(env, " + struct_name + "_class, " + struct_name + "_" + variant + ");\n")
 956                     ord_v = ord_v + 1
 957             out_c.write("\t\tdefault: abort();\n")
 958             out_c.write("\t}\n")
 959             out_c.write("}\n\n")
 960
 961     def map_complex_enum(struct_name, union_enum_items):
 962         java_hu_type = struct_name.replace("LDK", "")
 963         complex_enums.add(struct_name)
 964         with open(sys.argv[3] + "/structs/" + java_hu_type + ".java", "w") as out_java_enum:
 965             out_java_enum.write(hu_struct_file_prefix)
 966             out_java_enum.write("public class " + java_hu_type + " extends CommonBase {\n")
 967             out_java_enum.write("\tprivate " + java_hu_type + "(Object _dummy, long ptr) { super(ptr); }\n")
 968             out_java_enum.write("\t@Override @SuppressWarnings(\"deprecation\")\n")
 969             out_java_enum.write("\tprotected void finalize() throws Throwable {\n")
 970             out_java_enum.write("\t\tsuper.finalize();\n")
 971             out_java_enum.write("\t\tif (ptr != 0) { bindings." + java_hu_type + "_free(ptr); }\n")
 972             out_java_enum.write("\t}\n")
 973             out_java_enum.write("\tstatic " + java_hu_type + " constr_from_ptr(long ptr) {\n")
 974             out_java_enum.write("\t\tbindings." + struct_name + " raw_val = bindings." + struct_name + "_ref_from_ptr(ptr);\n")
 975             java_hu_subclasses = ""
 976
 977             tag_field_lines = union_enum_items["field_lines"]
 978             init_meth_jty_strs = {}
 979             for idx, struct_line in enumerate(tag_field_lines):
 980                 if idx == 0:
 981                     out_java.write("\tpublic static class " + struct_name + " {\n")
 982                     out_java.write("\t\tprivate " + struct_name + "() {}\n")
 983                 elif idx == len(tag_field_lines) - 3:
 984                     assert(struct_line.endswith("_Sentinel,"))
 985                 elif idx == len(tag_field_lines) - 2:
 986                     out_java.write("\t\tstatic native void init();\n")
 987                     out_java.write("\t}\n")
 988                 elif idx == len(tag_field_lines) - 1:
 989                     assert(struct_line == "")
 990                 else:
 991                     var_name = struct_line.strip(' ,')[len(struct_name) + 1:]
 992                     out_java.write("\t\tpublic final static class " + var_name + " extends " + struct_name + " {\n")
 993                     java_hu_subclasses = java_hu_subclasses + "\tpublic final static class " + var_name + " extends " + java_hu_type + " {\n"
 994                     out_java_enum.write("\t\tif (raw_val.getClass() == bindings." + struct_name + "." + var_name + ".class) {\n")
 995                     out_java_enum.write("\t\t\treturn new " + var_name + "(ptr, (bindings." + struct_name + "." + var_name + ")raw_val);\n")
 996                     out_c.write("static jclass " + struct_name + "_" + var_name + "_class = NULL;\n")
 997                     out_c.write("static jmethodID " + struct_name + "_" + var_name + "_meth = NULL;\n")
 998                     init_meth_jty_str = ""
 999                     init_meth_params = ""
1000                     init_meth_body = ""
1001                     hu_conv_body = ""
1002                     if "LDK" + var_name in union_enum_items:
1003                         enum_var_lines = union_enum_items["LDK" + var_name]
1004                         for idx, field in enumerate(enum_var_lines):
1005                             if idx != 0 and idx < len(enum_var_lines) - 2:
1006                                 field_ty = map_type(field.strip(' ;'), False, None, False, True)
1007                                 out_java.write("\t\t\tpublic " + field_ty.java_ty + " " + field_ty.arg_name + ";\n")
1008                                 java_hu_subclasses = java_hu_subclasses + "\t\tpublic final " + field_ty.java_hu_ty + " " + field_ty.arg_name + ";\n"
1009                                 if field_ty.to_hu_conv is not None:
1010                                     hu_conv_body = hu_conv_body + "\t\t\t" + field_ty.java_ty + " " + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
1011                                     hu_conv_body = hu_conv_body + "\t\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
1012                                     hu_conv_body = hu_conv_body + "\t\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
1013                                 else:
1014                                     hu_conv_body = hu_conv_body + "\t\t\tthis." + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
1015                                 init_meth_jty_str = init_meth_jty_str + field_ty.java_fn_ty_arg
1016                                 if idx > 1:
1017                                     init_meth_params = init_meth_params + ", "
1018                                 init_meth_params = init_meth_params + field_ty.java_ty + " " + field_ty.arg_name
1019                                 init_meth_body = init_meth_body + "this." + field_ty.arg_name + " = " + field_ty.arg_name + "; "
1020                         out_java.write("\t\t\t" + var_name + "(" + init_meth_params + ") { ")
1021                         out_java.write(init_meth_body)
1022                         out_java.write("}\n")
1023                     out_java.write("\t\t}\n")
1024                     out_java_enum.write("\t\t}\n")
1025                     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"
1026                     java_hu_subclasses = java_hu_subclasses + hu_conv_body
1027                     java_hu_subclasses = java_hu_subclasses + "\t\t}\n\t}\n"
1028                     init_meth_jty_strs[var_name] = init_meth_jty_str
1029             out_java_enum.write("\t\tassert false; return null; // Unreachable without extending the (internal) bindings interface\n\t}\n\n")
1030             out_java_enum.write(java_hu_subclasses)
1031             out_java.write("\tstatic { " + struct_name + ".init(); }\n")
1032             out_java.write("\tpublic static native " + struct_name + " " + struct_name + "_ref_from_ptr(long ptr);\n");
1033
1034             out_c.write("JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_00024" + struct_name.replace("_", "_1") + "_init (JNIEnv * env, jclass _a) {\n")
1035             for idx, struct_line in enumerate(tag_field_lines):
1036                 if idx != 0 and idx < len(tag_field_lines) - 3:
1037                     var_name = struct_line.strip(' ,')[len(struct_name) + 1:]
1038                     out_c.write("\t" + struct_name + "_" + var_name + "_class =\n")
1039                     out_c.write("\t\t(*env)->NewGlobalRef(env, (*env)->FindClass(env, \"Lorg/ldk/impl/bindings$" + struct_name + "$" + var_name + ";\"));\n")
1040                     out_c.write("\tCHECK(" + struct_name + "_" + var_name + "_class != NULL);\n")
1041                     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")
1042                     out_c.write("\tCHECK(" + struct_name + "_" + var_name + "_meth != NULL);\n")
1043             out_c.write("}\n")
1044             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")
1045             out_c.write("\t" + struct_name + " *obj = (" + struct_name + "*)ptr;\n")
1046             out_c.write("\tswitch(obj->tag) {\n")
1047             for idx, struct_line in enumerate(tag_field_lines):
1048                 if idx != 0 and idx < len(tag_field_lines) - 3:
1049                     var_name = struct_line.strip(' ,')[len(struct_name) + 1:]
1050                     out_c.write("\t\tcase " + struct_name + "_" + var_name + ": {\n")
1051                     c_params_text = ""
1052                     if "LDK" + var_name in union_enum_items:
1053                         enum_var_lines = union_enum_items["LDK" + var_name]
1054                         for idx, field in enumerate(enum_var_lines):
1055                             if idx != 0 and idx < len(enum_var_lines) - 2:
1056                                 field_map = map_type(field.strip(' ;'), False, None, False, True)
1057                                 if field_map.ret_conv is not None:
1058                                     out_c.write("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
1059                                     out_c.write("obj->" + camel_to_snake(var_name) + "." + field_map.arg_name)
1060                                     out_c.write(field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
1061                                     c_params_text = c_params_text + ", " + field_map.ret_conv_name
1062                                 else:
1063                                     c_params_text = c_params_text + ", obj->" + camel_to_snake(var_name) + "." + field_map.arg_name
1064                     out_c.write("\t\t\treturn (*_env)->NewObject(_env, " + struct_name + "_" + var_name + "_class, " + struct_name + "_" + var_name + "_meth" + c_params_text + ");\n")
1065                     out_c.write("\t\t}\n")
1066             out_c.write("\t\tdefault: abort();\n")
1067             out_c.write("\t}\n}\n")
1068             out_java_enum.write("}\n")
1069
1070     def map_trait(struct_name, field_var_lines, trait_fn_lines):
1071         with open(sys.argv[3] + "/structs/" + struct_name.replace("LDK","") + ".java", "w") as out_java_trait:
1072             out_c.write("typedef struct " + struct_name + "_JCalls {\n")
1073             out_c.write("\tatomic_size_t refcnt;\n")
1074             out_c.write("\tJavaVM *vm;\n")
1075             out_c.write("\tjweak o;\n")
1076             for var_line in field_var_lines:
1077                 if var_line.group(1) in trait_structs:
1078                     out_c.write("\t" + var_line.group(1) + "_JCalls* " + var_line.group(2) + ";\n")
1079             for fn_line in trait_fn_lines:
1080                 if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
1081                     out_c.write("\tjmethodID " + fn_line.group(2) + "_meth;\n")
1082             out_c.write("} " + struct_name + "_JCalls;\n")
1083
1084             out_java_trait.write(hu_struct_file_prefix)
1085             out_java_trait.write("public class " + struct_name.replace("LDK","") + " extends CommonBase {\n")
1086             out_java_trait.write("\tfinal bindings." + struct_name + " bindings_instance;\n")
1087             out_java_trait.write("\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); bindings_instance = null; }\n")
1088             out_java_trait.write("\tprivate " + struct_name.replace("LDK", "") + "(bindings." + struct_name + " arg")
1089             for var_line in field_var_lines:
1090                 if var_line.group(1) in trait_structs:
1091                     out_java_trait.write(", bindings." + var_line.group(1) + " " + var_line.group(2))
1092             out_java_trait.write(") {\n")
1093             out_java_trait.write("\t\tsuper(bindings." + struct_name + "_new(arg")
1094             for var_line in field_var_lines:
1095                 if var_line.group(1) in trait_structs:
1096                     out_java_trait.write(", " + var_line.group(2))
1097             out_java_trait.write("));\n")
1098             out_java_trait.write("\t\tthis.ptrs_to.add(arg);\n")
1099             out_java_trait.write("\t\tthis.bindings_instance = arg;\n")
1100             out_java_trait.write("\t}\n")
1101             out_java_trait.write("\t@Override @SuppressWarnings(\"deprecation\")\n")
1102             out_java_trait.write("\tprotected void finalize() throws Throwable {\n")
1103             out_java_trait.write("\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); } super.finalize();\n")
1104             out_java_trait.write("\t}\n\n")
1105
1106             java_trait_constr = "\tpublic " + struct_name.replace("LDK", "") + "(" + struct_name.replace("LDK", "") + "Interface arg"
1107             for var_line in field_var_lines:
1108                 if var_line.group(1) in trait_structs:
1109                     # Ideally we'd be able to take any instance of the interface, but our C code can only represent
1110                     # Java-implemented version, so we require users pass a Java implementation here :/
1111                     java_trait_constr = java_trait_constr + ", " + var_line.group(1).replace("LDK", "") + "." + var_line.group(1).replace("LDK", "") + "Interface " + var_line.group(2)
1112             java_trait_constr = java_trait_constr + ") {\n\t\tthis(new bindings." + struct_name + "() {\n"
1113             out_java_trait.write("\tpublic static interface " + struct_name.replace("LDK", "") + "Interface {\n")
1114             out_java.write("\tpublic interface " + struct_name + " {\n")
1115             java_meths = []
1116             for fn_line in trait_fn_lines:
1117                 java_meth_descr = "("
1118                 if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
1119                     ret_ty_info = map_type(fn_line.group(1), True, None, False, False)
1120
1121                     out_java.write("\t\t " + ret_ty_info.java_ty + " " + fn_line.group(2) + "(")
1122                     java_trait_constr = java_trait_constr + "\t\t\t@Override public " + ret_ty_info.java_ty + " " + fn_line.group(2) + "("
1123                     out_java_trait.write("\t\t" + ret_ty_info.java_hu_ty + " " + fn_line.group(2) + "(")
1124                     is_const = fn_line.group(3) is not None
1125                     out_c.write(fn_line.group(1) + fn_line.group(2) + "_jcall(")
1126                     if is_const:
1127                         out_c.write("const void* this_arg")
1128                     else:
1129                         out_c.write("void* this_arg")
1130
1131                     arg_names = []
1132                     for idx, arg in enumerate(fn_line.group(4).split(',')):
1133                         if arg == "":
1134                             continue
1135                         if idx >= 2:
1136                             out_java.write(", ")
1137                             java_trait_constr = java_trait_constr + ", "
1138                             out_java_trait.write(", ")
1139                         out_c.write(", ")
1140                         arg_conv_info = map_type(arg, True, None, False, False)
1141                         out_c.write(arg.strip())
1142                         out_java.write(arg_conv_info.java_ty + " " + arg_conv_info.arg_name)
1143                         out_java_trait.write(arg_conv_info.java_hu_ty + " " + arg_conv_info.arg_name)
1144                         java_trait_constr = java_trait_constr + arg_conv_info.java_ty + " " + arg_conv_info.arg_name
1145                         arg_names.append(arg_conv_info)
1146                         java_meth_descr = java_meth_descr + arg_conv_info.java_fn_ty_arg
1147                     java_meth_descr = java_meth_descr + ")" + ret_ty_info.java_fn_ty_arg
1148                     java_meths.append(java_meth_descr)
1149
1150                     out_java.write(");\n")
1151                     out_java_trait.write(");\n")
1152                     java_trait_constr = java_trait_constr + ") {\n"
1153                     out_c.write(") {\n")
1154                     out_c.write("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
1155                     out_c.write("\tJNIEnv *_env;\n")
1156                     out_c.write("\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&_env, JNI_VERSION_1_8) == JNI_OK);\n")
1157
1158                     for arg_info in arg_names:
1159                         if arg_info.ret_conv is not None:
1160                             out_c.write("\t" + arg_info.ret_conv[0].replace('\n', '\n\t'));
1161                             out_c.write(arg_info.arg_name)
1162                             out_c.write(arg_info.ret_conv[1].replace('\n', '\n\t') + "\n")
1163                         if arg_info.to_hu_conv is not None:
1164                             java_trait_constr = java_trait_constr + "\t\t\t\t" + arg_info.to_hu_conv.replace("\n", "\n\t\t\t\t") + "\n"
1165
1166                     out_c.write("\tjobject obj = (*_env)->NewLocalRef(_env, j_calls->o);\n\tCHECK(obj != NULL);\n")
1167                     if ret_ty_info.c_ty.endswith("Array"):
1168                         out_c.write("\t" + ret_ty_info.c_ty + " ret = (*_env)->CallObjectMethod(_env, obj, j_calls->" + fn_line.group(2) + "_meth")
1169                     elif not ret_ty_info.passed_as_ptr:
1170                         out_c.write("\treturn (*_env)->Call" + ret_ty_info.java_ty.title() + "Method(_env, obj, j_calls->" + fn_line.group(2) + "_meth")
1171                     else:
1172                         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");
1173                     if ret_ty_info.java_ty != "void":
1174                         java_trait_constr = java_trait_constr + "\t\t\t\t" + ret_ty_info.java_hu_ty + " ret = arg." + fn_line.group(2) + "("
1175                     else:
1176                         java_trait_constr = java_trait_constr + "\t\t\t\targ." + fn_line.group(2) + "("
1177
1178                     for idx, arg_info in enumerate(arg_names):
1179                         if arg_info.ret_conv is not None:
1180                             out_c.write(", " + arg_info.ret_conv_name)
1181                         else:
1182                             out_c.write(", " + arg_info.arg_name)
1183                         if idx != 0:
1184                             java_trait_constr = java_trait_constr + ", "
1185                         if arg_info.to_hu_conv_name is not None:
1186                             java_trait_constr = java_trait_constr + arg_info.to_hu_conv_name
1187                         else:
1188                             java_trait_constr = java_trait_constr + arg_info.arg_name
1189                     out_c.write(");\n");
1190                     if ret_ty_info.arg_conv is not None:
1191                         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")
1192
1193                     if ret_ty_info.passed_as_ptr:
1194                         out_c.write("\t" + fn_line.group(1).strip() + " res = *ret;\n")
1195                         out_c.write("\tFREE(ret);\n")
1196                         out_c.write("\treturn res;\n")
1197                     out_c.write("}\n")
1198                     java_trait_constr = java_trait_constr + ");\n"
1199                     if ret_ty_info.java_ty != "void":
1200                         if ret_ty_info.from_hu_conv is not None:
1201                             java_trait_constr = java_trait_constr + "\t\t\t\t" + ret_ty_info.java_ty + " result = " + ret_ty_info.from_hu_conv[0] + ";\n"
1202                             if ret_ty_info.from_hu_conv[1] != "":
1203                                 java_trait_constr = java_trait_constr + "\t\t\t\t" + ret_ty_info.from_hu_conv[1] + "\n"
1204                             if is_common_base_ext(ret_ty_info.rust_obj):
1205                                 java_trait_constr = java_trait_constr + "\t\t\t\tret.ptr = 0;\n"
1206                             java_trait_constr = java_trait_constr + "\t\t\t\treturn result;\n"
1207                         else:
1208                             java_trait_constr = java_trait_constr + "\t\t\t\treturn ret;\n"
1209                     java_trait_constr = java_trait_constr + "\t\t\t}\n"
1210                 elif fn_line.group(2) == "free":
1211                     out_c.write("static void " + struct_name + "_JCalls_free(void* this_arg) {\n")
1212                     out_c.write("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
1213                     out_c.write("\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n")
1214                     out_c.write("\t\tJNIEnv *env;\n")
1215                     out_c.write("\t\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_8) == JNI_OK);\n")
1216                     out_c.write("\t\t(*env)->DeleteWeakGlobalRef(env, j_calls->o);\n")
1217                     out_c.write("\t\tFREE(j_calls);\n")
1218                     out_c.write("\t}\n}\n")
1219             java_trait_constr = java_trait_constr + "\t\t}"
1220             for var_line in field_var_lines:
1221                 if var_line.group(1) in trait_structs:
1222                     java_trait_constr = java_trait_constr + ", new " + var_line.group(2) + "(" + var_line.group(2) + ").bindings_instance"
1223             out_java_trait.write("\t}\n")
1224             out_java_trait.write(java_trait_constr + ");\n\t}\n")
1225
1226             # Write out a clone function whether we need one or not, as we use them in moving to rust
1227             out_c.write("static void* " + struct_name + "_JCalls_clone(const void* this_arg) {\n")
1228             out_c.write("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
1229             out_c.write("\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n")
1230             for var_line in field_var_lines:
1231                 if var_line.group(1) in trait_structs:
1232                     out_c.write("\tatomic_fetch_add_explicit(&j_calls->" + var_line.group(2) + "->refcnt, 1, memory_order_release);\n")
1233             out_c.write("\treturn (void*) this_arg;\n")
1234             out_c.write("}\n")
1235
1236             out_java.write("\t}\n")
1237
1238             out_java.write("\tpublic static native long " + struct_name + "_new(" + struct_name + " impl")
1239             out_c.write("static inline " + struct_name + " " + struct_name + "_init (JNIEnv * env, jclass _a, jobject o")
1240             for var_line in field_var_lines:
1241                 if var_line.group(1) in trait_structs:
1242                     out_java.write(", " + var_line.group(1) + " " + var_line.group(2))
1243                     out_c.write(", jobject " + var_line.group(2))
1244             out_java.write(");\n")
1245             out_c.write(") {\n")
1246
1247             out_c.write("\tjclass c = (*env)->GetObjectClass(env, o);\n")
1248             out_c.write("\tCHECK(c != NULL);\n")
1249             out_c.write("\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n")
1250             out_c.write("\tatomic_init(&calls->refcnt, 1);\n")
1251             out_c.write("\tDO_ASSERT((*env)->GetJavaVM(env, &calls->vm) == 0);\n")
1252             out_c.write("\tcalls->o = (*env)->NewWeakGlobalRef(env, o);\n")
1253             for (fn_line, java_meth_descr) in zip(trait_fn_lines, java_meths):
1254                 if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
1255                     out_c.write("\tcalls->" + fn_line.group(2) + "_meth = (*env)->GetMethodID(env, c, \"" + fn_line.group(2) + "\", \"" + java_meth_descr + "\");\n")
1256                     out_c.write("\tCHECK(calls->" + fn_line.group(2) + "_meth != NULL);\n")
1257             out_c.write("\n\t" + struct_name + " ret = {\n")
1258             out_c.write("\t\t.this_arg = (void*) calls,\n")
1259             for fn_line in trait_fn_lines:
1260                 if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
1261                     out_c.write("\t\t." + fn_line.group(2) + " = " + fn_line.group(2) + "_jcall,\n")
1262                 elif fn_line.group(2) == "free":
1263                     out_c.write("\t\t.free = " + struct_name + "_JCalls_free,\n")
1264                 else:
1265                     clone_fns.add(struct_name + "_clone")
1266                     out_c.write("\t\t.clone = " + struct_name + "_JCalls_clone,\n")
1267             for var_line in field_var_lines:
1268                 if var_line.group(1) in trait_structs:
1269                     out_c.write("\t\t." + var_line.group(2) + " = " + var_line.group(1) + "_init(env, _a, " + var_line.group(2) + "),\n")
1270             out_c.write("\t};\n")
1271             for var_line in field_var_lines:
1272                 if var_line.group(1) in trait_structs:
1273                     out_c.write("\tcalls->" + var_line.group(2) + " = ret." + var_line.group(2) + ".this_arg;\n")
1274             out_c.write("\treturn ret;\n")
1275             out_c.write("}\n")
1276
1277             out_c.write("JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1new (JNIEnv * env, jclass _a, jobject o")
1278             for var_line in field_var_lines:
1279                 if var_line.group(1) in trait_structs:
1280                     out_c.write(", jobject " + var_line.group(2))
1281             out_c.write(") {\n")
1282             out_c.write("\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n")
1283             out_c.write("\t*res_ptr = " + struct_name + "_init(env, _a, o")
1284             for var_line in field_var_lines:
1285                 if var_line.group(1) in trait_structs:
1286                     out_c.write(", " + var_line.group(2))
1287             out_c.write(");\n")
1288             out_c.write("\treturn (long)res_ptr;\n")
1289             out_c.write("}\n")
1290
1291             out_java.write("\tpublic static native " + struct_name + " " + struct_name + "_get_obj_from_jcalls(long val);\n")
1292             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")
1293             out_c.write("\tjobject ret = (*env)->NewLocalRef(env, ((" + struct_name + "_JCalls*)val)->o);\n")
1294             out_c.write("\tCHECK(ret != NULL);\n")
1295             out_c.write("\treturn ret;\n")
1296             out_c.write("}\n")
1297
1298         for fn_line in trait_fn_lines:
1299             # For now, just disable enabling the _call_log - we don't know how to inverse-map String
1300             is_log = fn_line.group(2) == "log" and struct_name == "LDKLogger"
1301             if fn_line.group(2) != "free" and fn_line.group(2) != "clone" and fn_line.group(2) != "eq" and not is_log:
1302                 dummy_line = fn_line.group(1) + struct_name.replace("LDK", "") + "_" + fn_line.group(2) + " " + struct_name + "* this_arg" + fn_line.group(4) + "\n"
1303                 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")
1304
1305     out_c.write("""#include \"org_ldk_impl_bindings.h\"
1306 #include <rust_types.h>
1307 #include <lightning.h>
1308 #include <string.h>
1309 #include <stdatomic.h>
1310 """)
1311
1312     if sys.argv[4] == "false":
1313         out_c.write("#define MALLOC(a, _) malloc(a)\n")
1314         out_c.write("#define FREE(p) if ((p) > 1024) { free(p); }\n")
1315         out_c.write("#define DO_ASSERT(a) (void)(a)\n")
1316         out_c.write("#define CHECK(a)\n")
1317     else:
1318         out_c.write("""#include <assert.h>
1319 // Always run a, then assert it is true:
1320 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
1321 // Assert a is true or do nothing
1322 #define CHECK(a) DO_ASSERT(a)
1323
1324 // Running a leak check across all the allocations and frees of the JDK is a mess,
1325 // so instead we implement our own naive leak checker here, relying on the -wrap
1326 // linker option to wrap malloc/calloc/realloc/free, tracking everyhing allocated
1327 // and free'd in Rust or C across the generated bindings shared library.
1328 #include <threads.h>
1329 #include <execinfo.h>
1330 #include <unistd.h>
1331 static mtx_t allocation_mtx;
1332
1333 void __attribute__((constructor)) init_mtx() {
1334         DO_ASSERT(mtx_init(&allocation_mtx, mtx_plain) == thrd_success);
1335 }
1336
1337 #define BT_MAX 128
1338 typedef struct allocation {
1339         struct allocation* next;
1340         void* ptr;
1341         const char* struct_name;
1342         void* bt[BT_MAX];
1343         int bt_len;
1344 } allocation;
1345 static allocation* allocation_ll = NULL;
1346
1347 void* __real_malloc(size_t len);
1348 void* __real_calloc(size_t nmemb, size_t len);
1349 static void new_allocation(void* res, const char* struct_name) {
1350         allocation* new_alloc = __real_malloc(sizeof(allocation));
1351         new_alloc->ptr = res;
1352         new_alloc->struct_name = struct_name;
1353         new_alloc->bt_len = backtrace(new_alloc->bt, BT_MAX);
1354         DO_ASSERT(mtx_lock(&allocation_mtx) == thrd_success);
1355         new_alloc->next = allocation_ll;
1356         allocation_ll = new_alloc;
1357         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
1358 }
1359 static void* MALLOC(size_t len, const char* struct_name) {
1360         void* res = __real_malloc(len);
1361         new_allocation(res, struct_name);
1362         return res;
1363 }
1364 void __real_free(void* ptr);
1365 static void alloc_freed(void* ptr) {
1366         allocation* p = NULL;
1367         DO_ASSERT(mtx_lock(&allocation_mtx) == thrd_success);
1368         allocation* it = allocation_ll;
1369         while (it->ptr != ptr) {
1370                 p = it; it = it->next;
1371                 if (it == NULL) {
1372                         fprintf(stderr, "Tried to free unknown pointer %p!\\n", ptr);
1373                         return; // addrsan should catch malloc-unknown and print more info than we have
1374                 }
1375         }
1376         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
1377         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
1378         DO_ASSERT(it->ptr == ptr);
1379         __real_free(it);
1380 }
1381 static void FREE(void* ptr) {
1382         if ((long)ptr < 1024) return; // Rust loves to create pointers to the NULL page for dummys
1383         alloc_freed(ptr);
1384         __real_free(ptr);
1385 }
1386
1387 void* __wrap_malloc(size_t len) {
1388         void* res = __real_malloc(len);
1389         new_allocation(res, "malloc call");
1390         return res;
1391 }
1392 void* __wrap_calloc(size_t nmemb, size_t len) {
1393         void* res = __real_calloc(nmemb, len);
1394         new_allocation(res, "calloc call");
1395         return res;
1396 }
1397 void __wrap_free(void* ptr) {
1398         alloc_freed(ptr);
1399         __real_free(ptr);
1400 }
1401
1402 void* __real_realloc(void* ptr, size_t newlen);
1403 void* __wrap_realloc(void* ptr, size_t len) {
1404         alloc_freed(ptr);
1405         void* res = __real_realloc(ptr, len);
1406         new_allocation(res, "realloc call");
1407         return res;
1408 }
1409 void __wrap_reallocarray(void* ptr, size_t new_sz) {
1410         // Rust doesn't seem to use reallocarray currently
1411         assert(false);
1412 }
1413
1414 void __attribute__((destructor)) check_leaks() {
1415         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
1416                 fprintf(stderr, "%s %p remains:\\n", a->struct_name, a->ptr);
1417                 backtrace_symbols_fd(a->bt, a->bt_len, STDERR_FILENO);
1418                 fprintf(stderr, "\\n\\n");
1419         }
1420         DO_ASSERT(allocation_ll == NULL);
1421 }
1422 """)
1423     out_java.write("""package org.ldk.impl;
1424 import org.ldk.enums.*;
1425
1426 public class bindings {
1427         public static class VecOrSliceDef {
1428                 public long dataptr;
1429                 public long datalen;
1430                 public long stride;
1431                 public VecOrSliceDef(long dataptr, long datalen, long stride) {
1432                         this.dataptr = dataptr; this.datalen = datalen; this.stride = stride;
1433                 }
1434         }
1435         static {
1436                 System.loadLibrary(\"lightningjni\");
1437                 init(java.lang.Enum.class, VecOrSliceDef.class);
1438         }
1439         static native void init(java.lang.Class c, java.lang.Class slicedef);
1440
1441         public static native boolean deref_bool(long ptr);
1442         public static native long deref_long(long ptr);
1443         public static native void free_heap_ptr(long ptr);
1444         public static native byte[] read_bytes(long ptr, long len);
1445         public static native byte[] get_u8_slice_bytes(long slice_ptr);
1446         public static native long bytes_to_u8_vec(byte[] bytes);
1447         public static native long new_txpointer_copy_data(byte[] txdata);
1448         public static native void txpointer_free(long ptr);
1449         public static native long vec_slice_len(long vec);
1450         public static native long new_empty_slice_vec();
1451
1452 """)
1453     out_c.write("""
1454 static jmethodID ordinal_meth = NULL;
1455 static jmethodID slicedef_meth = NULL;
1456 static jclass slicedef_cls = NULL;
1457 JNIEXPORT void Java_org_ldk_impl_bindings_init(JNIEnv * env, jclass _b, jclass enum_class, jclass slicedef_class) {
1458         ordinal_meth = (*env)->GetMethodID(env, enum_class, "ordinal", "()I");
1459         CHECK(ordinal_meth != NULL);
1460         slicedef_meth = (*env)->GetMethodID(env, slicedef_class, "<init>", "(JJJ)V");
1461         CHECK(slicedef_meth != NULL);
1462         slicedef_cls = (*env)->NewGlobalRef(env, slicedef_class);
1463         CHECK(slicedef_cls != NULL);
1464 }
1465
1466 JNIEXPORT jboolean JNICALL Java_org_ldk_impl_bindings_deref_1bool (JNIEnv * env, jclass _a, jlong ptr) {
1467         return *((bool*)ptr);
1468 }
1469 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_deref_1long (JNIEnv * env, jclass _a, jlong ptr) {
1470         return *((long*)ptr);
1471 }
1472 JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_free_1heap_1ptr (JNIEnv * env, jclass _a, jlong ptr) {
1473         FREE((void*)ptr);
1474 }
1475 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_read_1bytes (JNIEnv * _env, jclass _b, jlong ptr, jlong len) {
1476         jbyteArray ret_arr = (*_env)->NewByteArray(_env, len);
1477         (*_env)->SetByteArrayRegion(_env, ret_arr, 0, len, (unsigned char*)ptr);
1478         return ret_arr;
1479 }
1480 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_get_1u8_1slice_1bytes (JNIEnv * _env, jclass _b, jlong slice_ptr) {
1481         LDKu8slice *slice = (LDKu8slice*)slice_ptr;
1482         jbyteArray ret_arr = (*_env)->NewByteArray(_env, slice->datalen);
1483         (*_env)->SetByteArrayRegion(_env, ret_arr, 0, slice->datalen, slice->data);
1484         return ret_arr;
1485 }
1486 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_bytes_1to_1u8_1vec (JNIEnv * _env, jclass _b, jbyteArray bytes) {
1487         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "LDKCVec_u8");
1488         vec->datalen = (*_env)->GetArrayLength(_env, bytes);
1489         vec->data = (uint8_t*)MALLOC(vec->datalen, "LDKCVec_u8Z Bytes");
1490         (*_env)->GetByteArrayRegion (_env, bytes, 0, vec->datalen, vec->data);
1491         return (long)vec;
1492 }
1493 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_new_1txpointer_1copy_1data (JNIEnv * env, jclass _b, jbyteArray bytes) {
1494         LDKTransaction *txdata = (LDKTransaction*)MALLOC(sizeof(LDKTransaction), "LDKTransaction");
1495         txdata->datalen = (*env)->GetArrayLength(env, bytes);
1496         txdata->data = (uint8_t*)MALLOC(txdata->datalen, "Tx Data Bytes");
1497         txdata->data_is_owned = false;
1498         (*env)->GetByteArrayRegion (env, bytes, 0, txdata->datalen, txdata->data);
1499         return (long)txdata;
1500 }
1501 JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_txpointer_1free (JNIEnv * env, jclass _b, jlong ptr) {
1502         LDKTransaction *tx = (LDKTransaction*)ptr;
1503         tx->data_is_owned = true;
1504         Transaction_free(*tx);
1505         FREE((void*)ptr);
1506 }
1507 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_vec_1slice_1len (JNIEnv * env, jclass _a, jlong ptr) {
1508         // Check offsets of a few Vec types are all consistent as we're meant to be generic across types
1509         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_SignatureZ, datalen), "Vec<*> needs to be mapped identically");
1510         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_MessageSendEventZ, datalen), "Vec<*> needs to be mapped identically");
1511         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_EventZ, datalen), "Vec<*> needs to be mapped identically");
1512         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_C2Tuple_usizeTransactionZZ, datalen), "Vec<*> needs to be mapped identically");
1513         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)ptr;
1514         return (long)vec->datalen;
1515 }
1516 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_new_1empty_1slice_1vec (JNIEnv * _env, jclass _b) {
1517         // Check sizes of a few Vec types are all consistent as we're meant to be generic across types
1518         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_SignatureZ), "Vec<*> needs to be mapped identically");
1519         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_MessageSendEventZ), "Vec<*> needs to be mapped identically");
1520         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_EventZ), "Vec<*> needs to be mapped identically");
1521         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_C2Tuple_usizeTransactionZZ), "Vec<*> needs to be mapped identically");
1522         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "Empty LDKCVec");
1523         vec->data = NULL;
1524         vec->datalen = 0;
1525         return (long)vec;
1526 }
1527
1528 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
1529 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
1530 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
1531 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
1532
1533 """)
1534
1535     with open(sys.argv[3] + "/structs/CommonBase.java", "a") as out_java_struct:
1536         out_java_struct.write("""package org.ldk.structs;
1537 import java.util.LinkedList;
1538 class CommonBase {
1539         long ptr;
1540         LinkedList<Object> ptrs_to = new LinkedList();
1541         protected CommonBase(long ptr) { this.ptr = ptr; }
1542         public long _test_only_get_ptr() { return this.ptr; }
1543 }
1544 """)
1545
1546     in_block_comment = False
1547     cur_block_obj = None
1548
1549     const_val_regex = re.compile("^extern const ([A-Za-z_0-9]*) ([A-Za-z_0-9]*);$")
1550
1551     line_indicates_result_regex = re.compile("^   (LDKCResultPtr_[A-Za-z_0-9]*) contents;$")
1552     line_indicates_vec_regex = re.compile("^   ([A-Za-z_0-9]*) \*data;$")
1553     line_indicates_opaque_regex = re.compile("^   bool is_owned;$")
1554     line_indicates_trait_regex = re.compile("^   ([A-Za-z_0-9]* \*?)\(\*([A-Za-z_0-9]*)\)\((const )?void \*this_arg(.*)\);$")
1555     assert(line_indicates_trait_regex.match("   uintptr_t (*send_data)(void *this_arg, LDKu8slice data, bool resume_read);"))
1556     assert(line_indicates_trait_regex.match("   LDKCVec_MessageSendEventZ (*get_and_clear_pending_msg_events)(const void *this_arg);"))
1557     assert(line_indicates_trait_regex.match("   void *(*clone)(const void *this_arg);"))
1558     line_field_var_regex = re.compile("^   ([A-Za-z_0-9]*) ([A-Za-z_0-9]*);$")
1559     assert(line_field_var_regex.match("   LDKMessageSendEventsProvider MessageSendEventsProvider;"))
1560     struct_name_regex = re.compile("^typedef (struct|enum|union) (MUST_USE_STRUCT )?(LDK[A-Za-z_0-9]*) {$")
1561     assert(struct_name_regex.match("typedef struct LDKCVecTempl_u8 {"))
1562     assert(struct_name_regex.match("typedef enum LDKNetwork {"))
1563     struct_alias_regex = re.compile("^typedef (LDK[A-Za-z_0-9]*) (LDK[A-Za-z_0-9]*);$")
1564     assert(struct_alias_regex.match("typedef LDKCResultTempl_bool__PeerHandleError LDKCResult_boolPeerHandleErrorZ;"))
1565
1566     result_templ_structs = set()
1567     union_enum_items = {}
1568     result_ptr_struct_items = {}
1569     for line in in_h:
1570         if in_block_comment:
1571             if line.endswith("*/\n"):
1572                 in_block_comment = False
1573         elif cur_block_obj is not None:
1574             cur_block_obj  = cur_block_obj + line
1575             if line.startswith("} "):
1576                 field_lines = []
1577                 struct_name = None
1578                 vec_ty = None
1579                 obj_lines = cur_block_obj.split("\n")
1580                 is_opaque = False
1581                 result_contents = None
1582                 is_unitary_enum = False
1583                 is_union_enum = False
1584                 is_union = False
1585                 is_tuple = False
1586                 trait_fn_lines = []
1587                 field_var_lines = []
1588
1589                 for idx, struct_line in enumerate(obj_lines):
1590                     if struct_line.strip().startswith("/*"):
1591                         in_block_comment = True
1592                     if in_block_comment:
1593                         if struct_line.endswith("*/"):
1594                             in_block_comment = False
1595                     else:
1596                         struct_name_match = struct_name_regex.match(struct_line)
1597                         if struct_name_match is not None:
1598                             struct_name = struct_name_match.group(3)
1599                             if struct_name_match.group(1) == "enum":
1600                                 if not struct_name.endswith("_Tag"):
1601                                     is_unitary_enum = True
1602                                 else:
1603                                     is_union_enum = True
1604                             elif struct_name_match.group(1) == "union":
1605                                 is_union = True
1606                         if line_indicates_opaque_regex.match(struct_line):
1607                             is_opaque = True
1608                         result_match = line_indicates_result_regex.match(struct_line)
1609                         if result_match is not None:
1610                             result_contents = result_match.group(1)
1611                         vec_ty_match = line_indicates_vec_regex.match(struct_line)
1612                         if vec_ty_match is not None and struct_name.startswith("LDKCVecTempl_"):
1613                             vec_ty = vec_ty_match.group(1)
1614                         elif struct_name.startswith("LDKC2TupleTempl_") or struct_name.startswith("LDKC3TupleTempl_"):
1615                             is_tuple = True
1616                         trait_fn_match = line_indicates_trait_regex.match(struct_line)
1617                         if trait_fn_match is not None:
1618                             trait_fn_lines.append(trait_fn_match)
1619                         field_var_match = line_field_var_regex.match(struct_line)
1620                         if field_var_match is not None:
1621                             field_var_lines.append(field_var_match)
1622                         field_lines.append(struct_line)
1623
1624                 assert(struct_name is not None)
1625                 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))
1626                 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))
1627                 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))
1628                 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))
1629                 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))
1630                 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))
1631                 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))
1632
1633                 if is_opaque:
1634                     opaque_structs.add(struct_name)
1635                     with open(sys.argv[3] + "/structs/" + struct_name.replace("LDK","") + ".java", "w") as out_java_struct:
1636                         out_java_struct.write(hu_struct_file_prefix)
1637                         out_java_struct.write("public class " + struct_name.replace("LDK","") + " extends CommonBase")
1638                         if struct_name.startswith("LDKLocked"):
1639                             out_java_struct.write(" implements AutoCloseable")
1640                         out_java_struct.write(" {\n")
1641                         out_java_struct.write("\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); }\n")
1642                         if struct_name.startswith("LDKLocked"):
1643                             out_java_struct.write("\t@Override public void close() {\n")
1644                         else:
1645                             out_java_struct.write("\t@Override @SuppressWarnings(\"deprecation\")\n")
1646                             out_java_struct.write("\tprotected void finalize() throws Throwable {\n")
1647                             out_java_struct.write("\t\tsuper.finalize();\n")
1648                         out_java_struct.write("\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); }\n")
1649                         out_java_struct.write("\t}\n\n")
1650                 elif result_contents is not None:
1651                     result_templ_structs.add(struct_name)
1652                     assert result_contents in result_ptr_struct_items
1653                 elif struct_name.startswith("LDKCResultPtr_"):
1654                     for line in field_lines:
1655                         if line.endswith("*result;"):
1656                             res_ty = line[:-8].strip()
1657                         elif line.endswith("*err;"):
1658                             err_ty = line[:-5].strip()
1659                     result_ptr_struct_items[struct_name] = (res_ty, err_ty)
1660                 elif is_tuple:
1661                     out_java.write("\tpublic static native long " + struct_name + "_new(")
1662                     out_c.write("JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1new(JNIEnv *_env, jclass _b")
1663                     ty_list = []
1664                     for idx, line in enumerate(field_lines):
1665                         if idx != 0 and idx < len(field_lines) - 2:
1666                             ty_info = java_c_types(line.strip(';'), None)
1667                             if idx != 1:
1668                                 out_java.write(", ")
1669                             e = chr(ord('a') + idx - 1)
1670                             out_java.write(ty_info.java_ty + " " + e)
1671                             out_c.write(", " + ty_info.c_ty + " " + e)
1672                             ty_list.append(ty_info)
1673                     tuple_types[struct_name] = (ty_list, struct_name)
1674                     out_java.write(");\n")
1675                     out_c.write(") {\n")
1676                     out_c.write("\t" + struct_name + "* ret = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n")
1677                     for idx, line in enumerate(field_lines):
1678                         if idx != 0 and idx < len(field_lines) - 2:
1679                             ty_info = map_type(line.strip(';'), False, None, False, False)
1680                             e = chr(ord('a') + idx - 1)
1681                             if ty_info.arg_conv is not None:
1682                                 out_c.write("\t" + ty_info.arg_conv.replace("\n", "\n\t"))
1683                                 out_c.write("\n\tret->" + e + " = " + ty_info.arg_conv_name + ";\n")
1684                             else:
1685                                 out_c.write("\tret->" + e + " = " + e + ";\n")
1686                             if ty_info.arg_conv_cleanup is not None:
1687                                 out_c.write("\t//TODO: Really need to call " + ty_info.arg_conv_cleanup + " here\n")
1688                     out_c.write("\treturn (long)ret;\n")
1689                     out_c.write("}\n")
1690                 elif vec_ty is not None:
1691                     if vec_ty in opaque_structs:
1692                         out_java.write("\tpublic static native long[] " + struct_name + "_arr_info(long vec_ptr);\n")
1693                         out_c.write("JNIEXPORT jlongArray JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1arr_1info(JNIEnv *env, jclass _b, jlong ptr) {\n")
1694                     else:
1695                         out_java.write("\tpublic static native VecOrSliceDef " + struct_name + "_arr_info(long vec_ptr);\n")
1696                         out_c.write("JNIEXPORT jobject JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1arr_1info(JNIEnv *env, jclass _b, jlong ptr) {\n")
1697                     out_c.write("\t" + struct_name + " *vec = (" + struct_name + "*)ptr;\n")
1698                     if vec_ty in opaque_structs:
1699                         out_c.write("\tjlongArray ret = (*env)->NewLongArray(env, vec->datalen);\n")
1700                         out_c.write("\tjlong *ret_elems = (*env)->GetPrimitiveArrayCritical(env, ret, NULL);\n")
1701                         out_c.write("\tfor (size_t i = 0; i < vec->datalen; i++) {\n")
1702                         out_c.write("\t\tCHECK((((long)vec->data[i].inner) & 1) == 0);\n")
1703                         out_c.write("\t\tret_elems[i] = (long)vec->data[i].inner | (vec->data[i].is_owned ? 1 : 0);\n")
1704                         out_c.write("\t}\n")
1705                         out_c.write("\t(*env)->ReleasePrimitiveArrayCritical(env, ret, ret_elems, 0);\n")
1706                         out_c.write("\treturn ret;\n")
1707                     else:
1708                         out_c.write("\treturn (*env)->NewObject(env, slicedef_cls, slicedef_meth, (long)vec->data, (long)vec->datalen, sizeof(" + vec_ty + "));\n")
1709                     out_c.write("}\n")
1710
1711                     ty_info = map_type(vec_ty + " arr_elem", False, None, False, False)
1712                     if len(ty_info.java_fn_ty_arg) == 1: # ie we're a primitive of some form
1713                         out_java.write("\tpublic static native long " + struct_name + "_new(" + ty_info.java_ty + "[] elems);\n")
1714                         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")
1715                         out_c.write("\t" + struct_name + " *ret = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n")
1716                         out_c.write("\tret->datalen = (*env)->GetArrayLength(env, elems);\n")
1717                         out_c.write("\tif (ret->datalen == 0) {\n")
1718                         out_c.write("\t\tret->data = NULL;\n")
1719                         out_c.write("\t} else {\n")
1720                         out_c.write("\t\tret->data = MALLOC(sizeof(" + vec_ty + ") * ret->datalen, \"" + struct_name + " Data\");\n")
1721                         out_c.write("\t\t" + ty_info.c_ty + " *java_elems = (*env)->GetPrimitiveArrayCritical(env, elems, NULL);\n")
1722                         out_c.write("\t\tfor (size_t i = 0; i < ret->datalen; i++) {\n")
1723                         if ty_info.arg_conv is not None:
1724                             out_c.write("\t\t\t" + ty_info.c_ty + " arr_elem = java_elems[i];\n")
1725                             out_c.write("\t\t\t" + ty_info.arg_conv.replace("\n", "\n\t\t\t") + "\n")
1726                             out_c.write("\t\t\tret->data[i] = " + ty_info.arg_conv_name + ";\n")
1727                             assert ty_info.arg_conv_cleanup is None
1728                         else:
1729                             out_c.write("\t\t\tret->data[i] = java_elems[i];\n")
1730                         out_c.write("\t\t}\n")
1731                         out_c.write("\t\t(*env)->ReleasePrimitiveArrayCritical(env, elems, java_elems, 0);\n")
1732                         out_c.write("\t}\n")
1733                         out_c.write("\treturn (long)ret;\n")
1734                         out_c.write("}\n")
1735                 elif is_union_enum:
1736                     assert(struct_name.endswith("_Tag"))
1737                     struct_name = struct_name[:-4]
1738                     union_enum_items[struct_name] = {"field_lines": field_lines}
1739                 elif struct_name.endswith("_Body") and struct_name.split("_")[0] in union_enum_items:
1740                     enum_var_name = struct_name.split("_")
1741                     union_enum_items[enum_var_name[0]][enum_var_name[1]] = field_lines
1742                 elif struct_name in union_enum_items:
1743                     map_complex_enum(struct_name, union_enum_items[struct_name])
1744                 elif is_unitary_enum:
1745                     map_unitary_enum(struct_name, field_lines)
1746                 elif len(trait_fn_lines) > 0:
1747                     trait_structs.add(struct_name)
1748                     map_trait(struct_name, field_var_lines, trait_fn_lines)
1749                 elif struct_name == "LDKTxOut":
1750                     with open(sys.argv[3] + "/structs/TxOut.java", "w") as out_java_struct:
1751                         out_java_struct.write(hu_struct_file_prefix)
1752                         out_java_struct.write("public class TxOut extends CommonBase{\n")
1753                         out_java_struct.write("\tTxOut(java.lang.Object _dummy, long ptr) { super(ptr); }\n")
1754                         out_java_struct.write("\tlong to_c_ptr() { return 0; }\n")
1755                         # TODO: TxOut body
1756                         out_java_struct.write("}")
1757                 elif struct_name == "LDKTransaction":
1758                     with open(sys.argv[3] + "/structs/Transaction.java", "w") as out_java_struct:
1759                         out_java_struct.write(hu_struct_file_prefix)
1760                         out_java_struct.write("public class Transaction extends CommonBase{\n")
1761                         out_java_struct.write("\tTransaction(java.lang.Object _dummy, long ptr) { super(ptr); }\n")
1762                         out_java_struct.write("\tpublic Transaction(byte[] data) { super(bindings.new_txpointer_copy_data(data)); }\n")
1763                         out_java_struct.write("\t@Override public void finalize() throws Throwable { super.finalize(); bindings.txpointer_free(ptr); }\n")
1764                         # TODO: Transaction body
1765                         out_java_struct.write("}")
1766                 else:
1767                     pass # Everything remaining is a byte[] or some form
1768                 cur_block_obj = None
1769         else:
1770             fn_ptr = fn_ptr_regex.match(line)
1771             fn_ret_arr = fn_ret_arr_regex.match(line)
1772             reg_fn = reg_fn_regex.match(line)
1773             const_val = const_val_regex.match(line)
1774
1775             if line.startswith("#include <"):
1776                 pass
1777             elif line.startswith("/*"):
1778                 #out_java.write("\t" + line)
1779                 if not line.endswith("*/\n"):
1780                     in_block_comment = True
1781             elif line.startswith("typedef enum "):
1782                 cur_block_obj = line
1783             elif line.startswith("typedef struct "):
1784                 cur_block_obj = line
1785             elif line.startswith("typedef union "):
1786                 cur_block_obj = line
1787             elif line.startswith("typedef "):
1788                 alias_match =  struct_alias_regex.match(line)
1789                 if alias_match.group(1) in tuple_types:
1790                     tuple_types[alias_match.group(2)] = (tuple_types[alias_match.group(1)][0], alias_match.group(2))
1791                     tuple_types[alias_match.group(1)] = (tuple_types[alias_match.group(1)][0], alias_match.group(2))
1792                     for idx, ty_info in enumerate(tuple_types[alias_match.group(1)][0]):
1793                         e = chr(ord('a') + idx)
1794                         out_java.write("\tpublic static native " + ty_info.java_ty + " " + alias_match.group(2) + "_get_" + e + "(long ptr);\n")
1795                         # XXX: Write C method!
1796                 elif alias_match.group(1) in result_templ_structs:
1797                     result_types.add(alias_match.group(2))
1798                     human_ty = alias_match.group(2).replace("LDKCResult", "Result")
1799                     with open(sys.argv[3] + "/structs/" + human_ty + ".java", "w") as out_java_struct:
1800                         out_java_struct.write(hu_struct_file_prefix)
1801                         out_java_struct.write("public class " + human_ty + " extends CommonBase {\n")
1802                         out_java_struct.write("\tprivate " + human_ty + "(Object _dummy, long ptr) { super(ptr); }\n")
1803                         out_java_struct.write("\tprotected void finalize() throws Throwable {\n")
1804                         out_java_struct.write("\t\tif (ptr != 0) { bindings." + alias_match.group(2).replace("LDK","") + "_free(ptr); } super.finalize();\n")
1805                         out_java_struct.write("\t}\n\n")
1806                         out_java_struct.write("\tstatic " + human_ty + " constr_from_ptr(long ptr) {\n")
1807                         out_java_struct.write("\t\tif (bindings." + alias_match.group(2) + "_result_ok(ptr)) {\n")
1808                         out_java_struct.write("\t\t\treturn new " + human_ty + "_OK(null, ptr);\n")
1809                         out_java_struct.write("\t\t} else {\n")
1810                         out_java_struct.write("\t\t\treturn new " + human_ty + "_Err(null, ptr);\n")
1811                         out_java_struct.write("\t\t}\n")
1812                         out_java_struct.write("\t}\n")
1813
1814                         contents_ty = alias_match.group(1).replace("LDKCResultTempl", "LDKCResultPtr")
1815                         res_ty, err_ty = result_ptr_struct_items[contents_ty]
1816                         res_map = map_type(res_ty + " res", True, None, False, True)
1817                         err_map = map_type(err_ty + " err", True, None, False, True)
1818
1819                         out_java.write("\tpublic static native boolean " + alias_match.group(2) + "_result_ok(long arg);\n")
1820                         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")
1821                         out_c.write("\treturn ((" + alias_match.group(2) + "*)arg)->result_ok;\n")
1822                         out_c.write("}\n")
1823
1824                         out_java.write("\tpublic static native " + res_map.java_ty + " " + alias_match.group(2) + "_get_ok(long arg);\n")
1825                         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")
1826                         out_c.write("\t" + alias_match.group(2) + " *val = (" + alias_match.group(2) + "*)arg;\n")
1827                         out_c.write("\tCHECK(val->result_ok);\n\t")
1828                         out_java_struct.write("\tpublic static final class " + human_ty + "_OK extends " + human_ty + " {\n")
1829                         if res_map.ret_conv is not None:
1830                             out_c.write(res_map.ret_conv[0].replace("\n", "\n\t") + "(*val->contents.result)")
1831                             out_c.write(res_map.ret_conv[1].replace("\n", "\n\t") + "\n\treturn " + res_map.ret_conv_name)
1832                         else:
1833                             out_c.write("return *val->contents.result")
1834                         out_c.write(";\n}\n")
1835
1836                         out_java_struct.write("\t\tpublic final " + res_map.java_hu_ty + " res;\n")
1837                         out_java_struct.write("\t\tprivate " + human_ty + "_OK(Object _dummy, long ptr) {\n")
1838                         out_java_struct.write("\t\t\tsuper(_dummy, ptr);\n")
1839                         if res_map.to_hu_conv is not None:
1840                             out_java_struct.write("\t\t\t" + res_map.java_ty + " res = bindings." + alias_match.group(2) + "_get_ok(ptr);\n")
1841                             out_java_struct.write("\t\t\t" + res_map.to_hu_conv.replace("\n", "\n\t\t\t"))
1842                             out_java_struct.write("\n\t\t\tthis.res = " + res_map.to_hu_conv_name + ";\n")
1843                         else:
1844                             out_java_struct.write("\t\t\tthis.res = bindings." + alias_match.group(2) + "_get_ok(ptr);\n")
1845                         out_java_struct.write("\t\t}\n")
1846                         if alias_match.group(2).startswith("LDKCResult_None"):
1847                             out_java_struct.write("\t\tpublic " + human_ty + "_OK() {\n\t\t\tthis(null, bindings.C" + human_ty + "_ok());\n")
1848                         else:
1849                             out_java_struct.write("\t\tpublic " + human_ty + "_OK(" + res_map.java_hu_ty + " res) {\n")
1850                             if res_map.from_hu_conv is not None:
1851                                 out_java_struct.write("\t\t\tthis(null, bindings.C" + human_ty + "_ok(" + res_map.from_hu_conv[0] + "));\n")
1852                                 if res_map.from_hu_conv[1] != "":
1853                                     out_java_struct.write("\t\t\t" + res_map.from_hu_conv[1] + ";\n")
1854                             else:
1855                                 out_java_struct.write("\t\t\tthis(null, bindings.C" + human_ty + "_ok(res));\n")
1856                         out_java_struct.write("\t\t}\n\t}\n\n")
1857
1858                         out_java.write("\tpublic static native " + err_map.java_ty + " " + alias_match.group(2) + "_get_err(long arg);\n")
1859                         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")
1860                         out_c.write("\t" + alias_match.group(2) + " *val = (" + alias_match.group(2) + "*)arg;\n")
1861                         out_c.write("\tCHECK(!val->result_ok);\n\t")
1862                         out_java_struct.write("\tpublic static final class " + human_ty + "_Err extends " + human_ty + " {\n")
1863                         if err_map.ret_conv is not None:
1864                             out_c.write(err_map.ret_conv[0].replace("\n", "\n\t") + "(*val->contents.err)")
1865                             out_c.write(err_map.ret_conv[1].replace("\n", "\n\t") + "\n\treturn " + err_map.ret_conv_name)
1866                         else:
1867                             out_c.write("return *val->contents.err")
1868                         out_c.write(";\n}\n")
1869
1870                         out_java_struct.write("\t\tpublic final " + err_map.java_hu_ty + " err;\n")
1871                         out_java_struct.write("\t\tprivate " + human_ty + "_Err(Object _dummy, long ptr) {\n")
1872                         out_java_struct.write("\t\t\tsuper(_dummy, ptr);\n")
1873                         if err_map.to_hu_conv is not None:
1874                             out_java_struct.write("\t\t\t" + err_map.java_ty + " err = bindings." + alias_match.group(2) + "_get_err(ptr);\n")
1875                             out_java_struct.write("\t\t\t" + err_map.to_hu_conv.replace("\n", "\n\t\t\t"))
1876                             out_java_struct.write("\n\t\t\tthis.err = " + err_map.to_hu_conv_name + ";\n")
1877                         else:
1878                             out_java_struct.write("\t\t\tthis.err = bindings." + alias_match.group(2) + "_get_err(ptr);\n")
1879                         out_java_struct.write("\t\t}\n")
1880
1881                         if alias_match.group(2).endswith("NoneZ"):
1882                             out_java_struct.write("\t\tpublic " + human_ty + "_Err() {\n\t\t\tthis(null, bindings.C" + human_ty + "_err());\n")
1883                         else:
1884                             out_java_struct.write("\t\tpublic " + human_ty + "_Err(" + err_map.java_hu_ty + " err) {\n")
1885                             if err_map.from_hu_conv is not None:
1886                                 out_java_struct.write("\t\t\tthis(null, bindings.C" + human_ty + "_err(" + err_map.from_hu_conv[0] + "));\n")
1887                                 if err_map.from_hu_conv[1] != "":
1888                                     out_java_struct.write("\t\t\t" + err_map.from_hu_conv[1] + ";\n")
1889                             else:
1890                                 out_java_struct.write("\t\t\tthis(null, bindings.C" + human_ty + "_err(err));\n")
1891                         out_java_struct.write("\t\t}\n\t}\n}\n")
1892             elif fn_ptr is not None:
1893                 map_fn(line, fn_ptr, None, None)
1894             elif fn_ret_arr is not None:
1895                 map_fn(line, fn_ret_arr, fn_ret_arr.group(4), None)
1896             elif reg_fn is not None:
1897                 map_fn(line, reg_fn, None, None)
1898             elif const_val_regex is not None:
1899                 # TODO Map const variables
1900                 pass
1901             else:
1902                 assert(line == "\n")
1903
1904     out_java.write("}\n")
1905     for struct_name in opaque_structs:
1906         with open(sys.argv[3] + "/structs/" + struct_name.replace("LDK","") + ".java", "a") as out_java_struct:
1907             out_java_struct.write("}\n")
1908     for struct_name in trait_structs:
1909         with open(sys.argv[3] + "/structs/" + struct_name.replace("LDK","") + ".java", "a") as out_java_struct:
1910             out_java_struct.write("}\n")