_ 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 class TypeInfo:
  10     def __init__(self, rust_obj, java_ty, java_fn_ty_arg, c_ty, passed_as_ptr, is_ptr, var_name, arr_len, arr_access):
  11         self.rust_obj = rust_obj
  12         self.java_ty = java_ty
  13         self.java_fn_ty_arg = java_fn_ty_arg
  14         self.c_ty = c_ty
  15         self.passed_as_ptr = passed_as_ptr
  16         self.is_ptr = is_ptr
  17         self.var_name = var_name
  18         self.arr_len = arr_len
  19         self.arr_access = arr_access
  20
  21 class ConvInfo:
  22     def __init__(self, ty_info, arg_name, arg_conv, arg_conv_name, ret_conv, ret_conv_name):
  23         assert(ty_info.c_ty is not None)
  24         assert(ty_info.java_ty is not None)
  25         assert(arg_name is not None)
  26         self.passed_as_ptr = ty_info.passed_as_ptr
  27         self.rust_obj = ty_info.rust_obj
  28         self.c_ty = ty_info.c_ty
  29         self.java_ty = ty_info.java_ty
  30         self.java_fn_ty_arg = ty_info.java_fn_ty_arg
  31         self.arg_name = arg_name
  32         self.arg_conv = arg_conv
  33         self.arg_conv_name = arg_conv_name
  34         self.ret_conv = ret_conv
  35         self.ret_conv_name = ret_conv_name
  36
  37     def print_ty(self):
  38         out_c.write(self.c_ty)
  39         out_java.write(self.java_ty)
  40
  41     def print_name(self):
  42         if self.arg_name != "":
  43             out_java.write(" " + self.arg_name)
  44             out_c.write(" " + self.arg_name)
  45         else:
  46             out_java.write(" arg")
  47             out_c.write(" arg")
  48 fn_ptr_regex = re.compile("^extern const ([A-Za-z_0-9\* ]*) \(\*(.*)\)\((.*)\);$")
  49 fn_ret_arr_regex = re.compile("(.*) \(\*(.*)\((.*)\)\)\[([0-9]*)\];$")
  50 reg_fn_regex = re.compile("([A-Za-z_0-9\* ]* \*?)([a-zA-Z_0-9]*)\((.*)\);$")
  51 clone_fns = set()
  52 with open(sys.argv[1]) as in_h:
  53     for line in in_h:
  54         reg_fn = reg_fn_regex.match(line)
  55         if reg_fn is not None:
  56             if reg_fn.group(2).endswith("_clone"):
  57                 clone_fns.add(reg_fn.group(2))
  58             continue
  59         arr_fn = fn_ret_arr_regex.match(line)
  60         if arr_fn is not None:
  61             if arr_fn.group(2).endswith("_clone"):
  62                 clone_fns.add(arr_fn.group(2))
  63             continue
  64
  65 with open(sys.argv[1]) as in_h, open(sys.argv[2], "w") as out_java, open(sys.argv[4], "w") as out_c:
  66     opaque_structs = set()
  67     trait_structs = set()
  68     unitary_enums = set()
  69
  70     def camel_to_snake(s):
  71         # Convert camel case to snake case, in a way that appears to match cbindgen
  72         con = "_"
  73         ret = ""
  74         lastchar = ""
  75         lastund = False
  76         for char in s:
  77             if lastchar.isupper():
  78                 if not char.isupper() and not lastund:
  79                     ret = ret + "_"
  80                     lastund = True
  81                 else:
  82                     lastund = False
  83                 ret = ret + lastchar.lower()
  84             else:
  85                 ret = ret + lastchar
  86                 if char.isupper() and not lastund:
  87                     ret = ret + "_"
  88                     lastund = True
  89                 else:
  90                     lastund = False
  91             lastchar = char
  92             if char.isnumeric():
  93                 lastund = True
  94         return (ret + lastchar.lower()).strip("_")
  95
  96     var_is_arr_regex = re.compile("\(\*([A-za-z0-9_]*)\)\[([0-9]*)\]")
  97     var_ty_regex = re.compile("([A-za-z_0-9]*)(.*)")
  98     def java_c_types(fn_arg, ret_arr_len):
  99         fn_arg = fn_arg.strip()
 100         if fn_arg.startswith("MUST_USE_RES "):
 101             fn_arg = fn_arg[13:]
 102         is_const = False
 103         if fn_arg.startswith("const "):
 104             fn_arg = fn_arg[6:]
 105             is_const = True
 106
 107         is_ptr = False
 108         take_by_ptr = False
 109         rust_obj = None
 110         arr_access = None
 111         if fn_arg.startswith("LDKThirtyTwoBytes"):
 112             fn_arg = "uint8_t (*" + fn_arg[18:] + ")[32]"
 113             assert var_is_arr_regex.match(fn_arg[8:])
 114             rust_obj = "LDKThirtyTwoBytes"
 115             arr_access = "data"
 116         if fn_arg.startswith("LDKPublicKey"):
 117             fn_arg = "uint8_t (*" + fn_arg[13:] + ")[33]"
 118             assert var_is_arr_regex.match(fn_arg[8:])
 119             rust_obj = "LDKPublicKey"
 120             arr_access = "compressed_form"
 121         if fn_arg.startswith("LDKSecretKey"):
 122             fn_arg = "uint8_t (*" + fn_arg[13:] + ")[32]"
 123             assert var_is_arr_regex.match(fn_arg[8:])
 124             rust_obj = "LDKSecretKey"
 125             arr_access = "bytes"
 126         #if fn_arg.startswith("LDKSignature"):
 127         #    fn_arg = "uint8_t (*" + fn_arg[13:] + ")[64]"
 128         #    assert var_is_arr_regex.match(fn_arg[8:])
 129         #    rust_obj = "LDKSignature"
 130
 131         if fn_arg.startswith("void"):
 132             java_ty = "void"
 133             c_ty = "void"
 134             fn_ty_arg = "V"
 135             fn_arg = fn_arg[4:].strip()
 136         elif fn_arg.startswith("bool"):
 137             java_ty = "boolean"
 138             c_ty = "jboolean"
 139             fn_ty_arg = "Z"
 140             fn_arg = fn_arg[4:].strip()
 141         elif fn_arg.startswith("uint8_t"):
 142             java_ty = "byte"
 143             c_ty = "jbyte"
 144             fn_ty_arg = "B"
 145             fn_arg = fn_arg[7:].strip()
 146         elif fn_arg.startswith("uint16_t"):
 147             java_ty = "short"
 148             c_ty = "jshort"
 149             fn_ty_arg = "S"
 150             fn_arg = fn_arg[8:].strip()
 151         elif fn_arg.startswith("uint32_t"):
 152             java_ty = "int"
 153             c_ty = "jint"
 154             fn_ty_arg = "I"
 155             fn_arg = fn_arg[8:].strip()
 156         elif fn_arg.startswith("uint64_t") or fn_arg.startswith("uintptr_t"):
 157             java_ty = "long"
 158             c_ty = "jlong"
 159             fn_ty_arg = "J"
 160             if fn_arg.startswith("uint64_t"):
 161                 fn_arg = fn_arg[8:].strip()
 162             else:
 163                 fn_arg = fn_arg[9:].strip()
 164         elif is_const and fn_arg.startswith("char *"):
 165             java_ty = "String"
 166             c_ty = "const char*"
 167             fn_ty_arg = "Ljava/lang/String;"
 168             fn_arg = fn_arg[6:].strip()
 169         else:
 170             ma = var_ty_regex.match(fn_arg)
 171             if ma.group(1).strip() in unitary_enums:
 172                 java_ty = ma.group(1).strip()
 173                 c_ty = "jclass"
 174                 fn_ty_arg = "Lorg/ldk/enums/" + ma.group(1).strip() + ";"
 175                 fn_arg = ma.group(2).strip()
 176                 rust_obj = ma.group(1).strip()
 177                 take_by_ptr = True
 178             else:
 179                 java_ty = "long"
 180                 c_ty = "jlong"
 181                 fn_ty_arg = "J"
 182                 fn_arg = ma.group(2).strip()
 183                 rust_obj = ma.group(1).strip()
 184                 take_by_ptr = True
 185
 186         if fn_arg.startswith(" *") or fn_arg.startswith("*"):
 187             fn_arg = fn_arg.replace("*", "").strip()
 188             is_ptr = True
 189             c_ty = "jlong"
 190             java_ty = "long"
 191             fn_ty_arg = "J"
 192
 193         var_is_arr = var_is_arr_regex.match(fn_arg)
 194         if var_is_arr is not None or ret_arr_len is not None:
 195             assert(not take_by_ptr)
 196             assert(not is_ptr)
 197             java_ty = java_ty + "[]"
 198             c_ty = c_ty + "Array"
 199             if var_is_arr is not None:
 200                 if var_is_arr.group(1) == "":
 201                     return TypeInfo(rust_obj=rust_obj, java_ty=java_ty, java_fn_ty_arg="[" + fn_ty_arg, c_ty=c_ty,
 202                         passed_as_ptr=False, is_ptr=False, var_name="arg", arr_len=var_is_arr.group(2), arr_access=arr_access)
 203                 return TypeInfo(rust_obj=rust_obj, java_ty=java_ty, java_fn_ty_arg="[" + fn_ty_arg, c_ty=c_ty,
 204                     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)
 205         return TypeInfo(rust_obj=rust_obj, java_ty=java_ty, java_fn_ty_arg=fn_ty_arg, c_ty=c_ty, passed_as_ptr=is_ptr or take_by_ptr,
 206             is_ptr=is_ptr, var_name=fn_arg, arr_len=None, arr_access=None)
 207
 208     def map_type(fn_arg, print_void, ret_arr_len, is_free):
 209         ty_info = java_c_types(fn_arg, ret_arr_len)
 210
 211         if ty_info.c_ty == "void":
 212             if not print_void:
 213                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 214                     arg_conv = None, arg_conv_name = None, ret_conv = None, ret_conv_name = None)
 215
 216         if ty_info.c_ty.endswith("Array"):
 217             arr_len = ty_info.arr_len
 218             if arr_len is not None:
 219                 arr_name = ty_info.var_name
 220             else:
 221                 arr_name = "ret"
 222                 arr_len = ret_arr_len
 223             assert(ty_info.c_ty == "jbyteArray")
 224             if ty_info.rust_obj is not None:
 225                 arg_conv = ty_info.rust_obj + " " + arr_name + "_ref;\n" + "(*_env)->GetByteArrayRegion (_env, " + arr_name + ", 0, " + arr_len + ", " + arr_name + "_ref." + ty_info.arr_access + ");"
 226                 arr_access = ("", "." + ty_info.arr_access)
 227             else:
 228                 arg_conv = "unsigned char " + arr_name + "_arr[" + arr_len + "];\n" + "(*_env)->GetByteArrayRegion (_env, " + arr_name + ", 0, " + arr_len + ", " + arr_name + "_arr);\n" + "unsigned char (*" + arr_name + "_ref)[" + arr_len + "] = &" + arr_name + "_arr;"
 229                 arr_access = ("*", "")
 230             return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 231                 arg_conv = arg_conv,
 232                 arg_conv_name = arr_name + "_ref",
 233                 ret_conv = ("jbyteArray " + arr_name + "_arr = (*_env)->NewByteArray(_env, " + arr_len + ");\n" +
 234                     "(*_env)->SetByteArrayRegion(_env, " + arr_name + "_arr, 0, " + arr_len + ", " + arr_access[0],
 235                     arr_access[1] + ");"),
 236                 ret_conv_name = arr_name + "_arr")
 237         elif ty_info.var_name != "":
 238             # If we have a parameter name, print it (noting that it may indicate its a pointer)
 239             if ty_info.rust_obj is not None:
 240                 assert(ty_info.passed_as_ptr)
 241                 opaque_arg_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv;\n"
 242                 opaque_arg_conv = opaque_arg_conv + ty_info.var_name + "_conv.inner = (void*)(" + ty_info.var_name + " & (~1));\n"
 243                 opaque_arg_conv = opaque_arg_conv + ty_info.var_name + "_conv.is_owned = (" + ty_info.var_name + " & 1) || (" + ty_info.var_name + " == 0);"
 244                 if (ty_info.rust_obj.replace("LDK", "") + "_clone") in clone_fns and not ty_info.is_ptr and not is_free:
 245                     # 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.
 246                     opaque_arg_conv = opaque_arg_conv + "\nif (" + ty_info.var_name + "_conv.inner != NULL)\n"
 247                     opaque_arg_conv = opaque_arg_conv + "\t" + ty_info.var_name + "_conv = " + ty_info.rust_obj.replace("LDK", "") + "_clone(&" + ty_info.var_name + "_conv);"
 248                 if not ty_info.is_ptr:
 249                     if ty_info.rust_obj in unitary_enums:
 250                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 251                             arg_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv = " + ty_info.rust_obj + "_from_java(_env, " + ty_info.var_name + ");",
 252                             arg_conv_name = ty_info.var_name + "_conv",
 253                             ret_conv = ("jclass " + ty_info.var_name + "_conv = " + ty_info.rust_obj + "_to_java(_env, ", ");"),
 254                             ret_conv_name = ty_info.var_name + "_conv")
 255                     if ty_info.rust_obj in opaque_structs:
 256                         ret_conv_suf = ";\nDO_ASSERT((((long)" + ty_info.var_name + "_var.inner) & 1) == 0); // We rely on a free low bit, malloc guarantees this.\n"
 257                         ret_conv_suf = ret_conv_suf + "DO_ASSERT((((long)&" + ty_info.var_name + "_var) & 1) == 0); // We rely on a free low bit, pointer alignment guarantees this.\n"
 258                         ret_conv_suf = ret_conv_suf + "long " + ty_info.var_name + "_ref;\n"
 259                         ret_conv_suf = ret_conv_suf + "if (" + ty_info.var_name + "_var.is_owned) {\n"
 260                         ret_conv_suf = ret_conv_suf + "\t" + ty_info.var_name + "_ref = (long)" + ty_info.var_name + "_var.inner | 1;\n"
 261                         ret_conv_suf = ret_conv_suf + "} else {\n"
 262                         ret_conv_suf = ret_conv_suf + "\t" + ty_info.var_name + "_ref = (long)&" + ty_info.var_name + "_var;\n"
 263                         ret_conv_suf = ret_conv_suf + "}"
 264                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 265                             arg_conv = opaque_arg_conv, arg_conv_name = ty_info.var_name + "_conv",
 266                             ret_conv = (ty_info.rust_obj + " " + ty_info.var_name + "_var = ", ret_conv_suf),
 267                             ret_conv_name = ty_info.var_name + "_ref")
 268                     base_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv = *(" + ty_info.rust_obj + "*)" + ty_info.var_name + ";";
 269                     if ty_info.rust_obj in trait_structs:
 270                         if not is_free:
 271                             base_conv = base_conv + "\nif (" + ty_info.var_name + "_conv.free == " + ty_info.rust_obj + "_JCalls_free) {\n"
 272                             base_conv = base_conv + "\t// If this_arg is a JCalls struct, then we need to increment the refcnt in it.\n"
 273                             base_conv = base_conv + "\t" + ty_info.rust_obj + "_JCalls_clone(" + ty_info.var_name + "_conv.this_arg);\n}"
 274                         else:
 275                             base_conv = base_conv + "\n" + "FREE((void*)" + ty_info.var_name + ");"
 276                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 277                             arg_conv = base_conv,
 278                             arg_conv_name = ty_info.var_name + "_conv",
 279                             ret_conv = ("CANT PASS TRAIT TO Java?", ""), ret_conv_name = "NO CONV POSSIBLE")
 280                     if ty_info.rust_obj != "LDKu8slice":
 281                         # Don't bother free'ing slices passed in - Rust doesn't auto-free the
 282                         # underlying unlike Vecs, and it gives Java more freedom.
 283                         base_conv = base_conv + "\nFREE((void*)" + ty_info.var_name + ");";
 284                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 285                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv",
 286                         ret_conv = ("long " + ty_info.var_name + "_ref = (long)&", ";"), ret_conv_name = ty_info.var_name + "_ref")
 287                 else:
 288                     assert(not is_free)
 289                     if ty_info.rust_obj in opaque_structs:
 290                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 291                             arg_conv = opaque_arg_conv, arg_conv_name = "&" + ty_info.var_name + "_conv",
 292                             ret_conv = None, ret_conv_name = None) # its a pointer, no conv needed
 293                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 294                         arg_conv = ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)" + ty_info.var_name + ";",
 295                         arg_conv_name = ty_info.var_name + "_conv",
 296                         ret_conv = None, ret_conv_name = None) # its a pointer, no conv needed
 297             elif ty_info.is_ptr:
 298                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 299                     arg_conv = None, arg_conv_name = ty_info.var_name, ret_conv = None, ret_conv_name = None)
 300             elif ty_info.java_ty == "String":
 301                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 302                     arg_conv = None, arg_conv_name = None,
 303                     ret_conv = ("jstring " + ty_info.var_name + "_conv = (*_env)->NewStringUTF(_env, ", ");"), ret_conv_name = ty_info.var_name + "_conv")
 304             else:
 305                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 306                     arg_conv = None, arg_conv_name = ty_info.var_name, ret_conv = None, ret_conv_name = None)
 307         elif not print_void:
 308             # We don't have a parameter name, and want one, just call it arg
 309             if ty_info.rust_obj is not None:
 310                 assert(not is_free or ty_info.rust_obj not in opaque_structs);
 311                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 312                     arg_conv = ty_info.rust_obj + " arg_conv = *(" + ty_info.rust_obj + "*)arg;\nFREE((void*)arg);",
 313                     arg_conv_name = "arg_conv",
 314                     ret_conv = None, ret_conv_name = None)
 315             else:
 316                 assert(not is_free)
 317                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 318                     arg_conv = None, arg_conv_name = "arg", ret_conv = None, ret_conv_name = None)
 319         else:
 320             # We don't have a parameter name, and don't want one (cause we're returning)
 321             if ty_info.rust_obj is not None:
 322                 if not ty_info.is_ptr:
 323                     if ty_info.rust_obj in unitary_enums:
 324                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 325                             arg_conv = ty_info.rust_obj + " ret = " + ty_info.rust_obj + "_from_java(_env, " + ty_info.var_name + ");",
 326                             arg_conv_name = "ret",
 327                             ret_conv = ("jclass ret = " + ty_info.rust_obj + "_to_java(_env, ", ");"), ret_conv_name = "ret")
 328                     if ty_info.rust_obj in opaque_structs:
 329                         # If we're returning a newly-allocated struct, we don't want Rust to ever
 330                         # free, instead relying on the Java GC to lose the ref. We undo this in
 331                         # any _free function.
 332                         # To avoid any issues, we first assert that the incoming object is non-ref.
 333                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 334                             ret_conv = (ty_info.rust_obj + " ret = ", ";"),
 335                             ret_conv_name = "((long)ret.inner) | (ret.is_owned ? 1 : 0)",
 336                             arg_conv = None, arg_conv_name = None)
 337                     else:
 338                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 339                             ret_conv = (ty_info.rust_obj + "* ret = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n*ret = ", ";"),
 340                             ret_conv_name = "(long)ret",
 341                             arg_conv = None, arg_conv_name = None)
 342                 else:
 343                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 344                         ret_conv = ("long ret = (long)", ";"), ret_conv_name = "ret",
 345                         arg_conv = None, arg_conv_name = None)
 346             else:
 347                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 348                     arg_conv = None, arg_conv_name = None, ret_conv = None, ret_conv_name = None)
 349
 350     def map_fn(line, re_match, ret_arr_len, c_call_string):
 351         out_java.write("\t// " + line)
 352         out_java.write("\tpublic static native ")
 353         out_c.write("JNIEXPORT ")
 354
 355         is_free = re_match.group(2).endswith("_free")
 356         struct_meth = re_match.group(2).split("_")[0]
 357
 358         ret_info = map_type(re_match.group(1), True, ret_arr_len, False)
 359         ret_info.print_ty()
 360
 361         if ret_info.ret_conv is not None:
 362             ret_conv_pfx, ret_conv_sfx = ret_info.ret_conv
 363
 364         out_java.write(" " + re_match.group(2) + "(")
 365         out_c.write(" JNICALL Java_org_ldk_impl_bindings_" + re_match.group(2).replace('_', '_1') + "(JNIEnv * _env, jclass _b")
 366
 367         arg_names = []
 368         takes_self = False
 369         args_known = not ret_info.passed_as_ptr or ret_info.rust_obj in opaque_structs or ret_info.rust_obj in trait_structs
 370         for idx, arg in enumerate(re_match.group(3).split(',')):
 371             if idx != 0:
 372                 out_java.write(", ")
 373             if arg != "void":
 374                 out_c.write(", ")
 375             arg_conv_info = map_type(arg, False, None, is_free)
 376             if arg_conv_info.c_ty != "void":
 377                 arg_conv_info.print_ty()
 378                 arg_conv_info.print_name()
 379             if arg_conv_info.arg_name == "this_arg":
 380                 takes_self = True
 381             if arg_conv_info.passed_as_ptr and not arg_conv_info.rust_obj in opaque_structs:
 382                 if not arg_conv_info.rust_obj in trait_structs and not arg_conv_info.rust_obj in unitary_enums:
 383                     print(re_match.group(2) + " bad - " + arg_conv_info.rust_obj)
 384                     args_known = False
 385             arg_names.append(arg_conv_info)
 386
 387         out_java_struct = None
 388         if ("LDK" + struct_meth in opaque_structs or "LDK" + struct_meth in trait_structs) and not is_free:
 389             out_java_struct = open(sys.argv[3] + "/structs/" + struct_meth + ".java", "a")
 390             if not args_known:
 391                 out_java_struct.write("\t// Skipped " + re_match.group(2) + "\n")
 392                 out_java_struct.close()
 393                 out_java_struct = None
 394             else:
 395                 out_java_struct.write("\tpublic ")
 396                 meth_n = re_match.group(2)[len(struct_meth) + 1:]
 397                 if ret_info.rust_obj == "LDK" + struct_meth:
 398                     out_java_struct.write(struct_meth + "(")
 399                 elif ret_info.rust_obj in opaque_structs or ret_info.rust_obj in trait_structs:
 400                     out_java_struct.write(ret_info.rust_obj.replace("LDK", "") + " " + meth_n + "(")
 401                 else:
 402                     out_java_struct.write(ret_info.java_ty + " " + meth_n + "(")
 403                 for idx, arg in enumerate(arg_names):
 404                     if idx != 0:
 405                         if not takes_self or idx > 1:
 406                             out_java_struct.write(", ")
 407                     if arg.java_ty != "void" and arg.arg_name != "this_arg":
 408                         if arg.passed_as_ptr:
 409                             if arg.rust_obj in opaque_structs or arg.rust_obj in trait_structs:
 410                                 out_java_struct.write(arg.rust_obj.replace("LDK", "") + " " + arg.arg_name)
 411                             else:
 412                                 out_java_struct.write(arg.rust_obj + " " + arg.arg_name)
 413                         else:
 414                             out_java_struct.write(arg.java_ty + " " + arg.arg_name)
 415
 416
 417         out_java.write(");\n")
 418         out_c.write(") {\n")
 419         if out_java_struct is not None:
 420             out_java_struct.write(") {\n")
 421
 422         for info in arg_names:
 423             if info.arg_conv is not None:
 424                 out_c.write("\t" + info.arg_conv.replace('\n', "\n\t") + "\n");
 425
 426         if ret_info.ret_conv is not None:
 427             out_c.write("\t" + ret_conv_pfx.replace('\n', '\n\t'));
 428         else:
 429             out_c.write("\treturn ");
 430
 431         if c_call_string is None:
 432             out_c.write(re_match.group(2) + "(")
 433         else:
 434             out_c.write(c_call_string)
 435         for idx, info in enumerate(arg_names):
 436             if info.arg_conv_name is not None:
 437                 if idx != 0:
 438                     out_c.write(", ")
 439                 elif c_call_string is not None:
 440                     continue
 441                 out_c.write(info.arg_conv_name)
 442         out_c.write(")")
 443         if ret_info.ret_conv is not None:
 444             out_c.write(ret_conv_sfx.replace('\n', '\n\t'))
 445             out_c.write("\n\treturn " + ret_info.ret_conv_name + ";")
 446         else:
 447             out_c.write(";")
 448         out_c.write("\n}\n\n")
 449         if out_java_struct is not None:
 450             out_java_struct.write("\t\t")
 451             if ret_info.rust_obj == "LDK" + struct_meth:
 452                 out_java_struct.write("super(")
 453             elif ret_info.java_ty != "void" and not ret_info.passed_as_ptr:
 454                 out_java_struct.write(ret_info.java_ty + " ret = ")
 455             elif ret_info.java_ty != "void":
 456                 out_java_struct.write(ret_info.rust_obj.replace("LDK", "") + " ret = ")
 457                 if ret_info.rust_obj in opaque_structs or ret_info.rust_obj in trait_structs:
 458                     out_java_struct.write("new " + ret_info.rust_obj.replace("LDK", "") + "(null, ")
 459             out_java_struct.write("bindings." + re_match.group(2) + "(")
 460             for idx, info in enumerate(arg_names):
 461                 if idx != 0:
 462                     out_java_struct.write(", ")
 463                 if info.arg_name == "this_arg":
 464                     out_java_struct.write("this.ptr")
 465                 elif info.passed_as_ptr and info.rust_obj in opaque_structs:
 466                     out_java_struct.write(info.arg_name + ".ptr & ~1")
 467                 elif info.passed_as_ptr and info.rust_obj in trait_structs:
 468                     out_java_struct.write(info.arg_name + ".ptr")
 469                 else:
 470                     out_java_struct.write(info.arg_name)
 471             out_java_struct.write(")")
 472             if ret_info.rust_obj == "LDK" + struct_meth:
 473                 out_java_struct.write(");\n")
 474             elif ret_info.rust_obj in opaque_structs:
 475                 out_java_struct.write(");\n")
 476             elif ret_info.rust_obj in trait_structs:
 477                 out_java_struct.write(");\n\t\tret.ptrs_to.add(this);\n")
 478             else:
 479                 out_java_struct.write(";\n")
 480
 481             for info in arg_names:
 482                 if info.arg_name == "this_arg":
 483                     pass
 484                 elif info.passed_as_ptr and (info.rust_obj in opaque_structs or info.rust_obj in trait_structs):
 485                     out_java_struct.write("\t\tthis.ptrs_to.add(" + info.arg_name + ");\n")
 486
 487             if ret_info.java_ty != "void" and ret_info.rust_obj != "LDK" + struct_meth:
 488                 out_java_struct.write("\t\treturn ret;\n")
 489             out_java_struct.write("\t}\n\n")
 490             out_java_struct.close()
 491
 492     def map_unitary_enum(struct_name, field_lines):
 493         with open(sys.argv[3] + "/enums/" + struct_name + ".java", "w") as out_java_enum:
 494             out_java_enum.write("package org.ldk.enums;\n\n")
 495             unitary_enums.add(struct_name)
 496             out_c.write("static inline " + struct_name + " " + struct_name + "_from_java(JNIEnv *env, jclass val) {\n")
 497             out_c.write("\tswitch ((*env)->CallIntMethod(env, val, ordinal_meth)) {\n")
 498             ord_v = 0
 499             for idx, struct_line in enumerate(field_lines):
 500                 if idx == 0:
 501                     out_java_enum.write("public enum " + struct_name + " {\n")
 502                 elif idx == len(field_lines) - 3:
 503                     assert(struct_line.endswith("_Sentinel,"))
 504                 elif idx == len(field_lines) - 2:
 505                     out_java_enum.write("\t; static native void init();\n")
 506                     out_java_enum.write("\tstatic { init(); }\n")
 507                     out_java_enum.write("}")
 508                     out_java.write("\tstatic { " + struct_name + ".values(); /* Force enum statics to run */ }\n")
 509                 elif idx == len(field_lines) - 1:
 510                     assert(struct_line == "")
 511                 else:
 512                     out_java_enum.write(struct_line + "\n")
 513                     out_c.write("\t\tcase %d: return %s;\n" % (ord_v, struct_line.strip().strip(",")))
 514                     ord_v = ord_v + 1
 515             out_c.write("\t}\n")
 516             out_c.write("\tabort();\n")
 517             out_c.write("}\n")
 518
 519             ord_v = 0
 520             out_c.write("static jclass " + struct_name + "_class = NULL;\n")
 521             for idx, struct_line in enumerate(field_lines):
 522                 if idx > 0 and idx < len(field_lines) - 3:
 523                     variant = struct_line.strip().strip(",")
 524                     out_c.write("static jfieldID " + struct_name + "_" + variant + " = NULL;\n")
 525             out_c.write("JNIEXPORT void JNICALL Java_org_ldk_enums_" + struct_name.replace("_", "_1") + "_init (JNIEnv * env, jclass clz) {\n")
 526             out_c.write("\t" + struct_name + "_class = (*env)->NewGlobalRef(env, clz);\n")
 527             out_c.write("\tDO_ASSERT(" + struct_name + "_class != NULL);\n")
 528             for idx, struct_line in enumerate(field_lines):
 529                 if idx > 0 and idx < len(field_lines) - 3:
 530                     variant = struct_line.strip().strip(",")
 531                     out_c.write("\t" + struct_name + "_" + variant + " = (*env)->GetStaticFieldID(env, " + struct_name + "_class, \"" + variant + "\", \"Lorg/ldk/enums/" + struct_name + ";\");\n")
 532                     out_c.write("\tDO_ASSERT(" + struct_name + "_" + variant + " != NULL);\n")
 533             out_c.write("}\n")
 534             out_c.write("static inline jclass " + struct_name + "_to_java(JNIEnv *env, " + struct_name + " val) {\n")
 535             out_c.write("\tswitch (val) {\n")
 536             for idx, struct_line in enumerate(field_lines):
 537                 if idx > 0 and idx < len(field_lines) - 3:
 538                     variant = struct_line.strip().strip(",")
 539                     out_c.write("\t\tcase " + variant + ":\n")
 540                     out_c.write("\t\t\treturn (*env)->GetStaticObjectField(env, " + struct_name + "_class, " + struct_name + "_" + variant + ");\n")
 541                     ord_v = ord_v + 1
 542             out_c.write("\t\tdefault: abort();\n")
 543             out_c.write("\t}\n")
 544             out_c.write("}\n\n")
 545
 546     def map_complex_enum(struct_name, union_enum_items):
 547         tag_field_lines = union_enum_items["field_lines"]
 548         init_meth_jty_strs = {}
 549         for idx, struct_line in enumerate(tag_field_lines):
 550             if idx == 0:
 551                 out_java.write("\tpublic static class " + struct_name + " {\n")
 552                 out_java.write("\t\tprivate " + struct_name + "() {}\n")
 553             elif idx == len(tag_field_lines) - 3:
 554                 assert(struct_line.endswith("_Sentinel,"))
 555             elif idx == len(tag_field_lines) - 2:
 556                 out_java.write("\t\tstatic native void init();\n")
 557                 out_java.write("\t}\n")
 558             elif idx == len(tag_field_lines) - 1:
 559                 assert(struct_line == "")
 560             else:
 561                 var_name = struct_line.strip(' ,')[len(struct_name) + 1:]
 562                 out_java.write("\t\tpublic final static class " + var_name + " extends " + struct_name + " {\n")
 563                 out_c.write("static jclass " + struct_name + "_" + var_name + "_class = NULL;\n")
 564                 out_c.write("static jmethodID " + struct_name + "_" + var_name + "_meth = NULL;\n")
 565                 init_meth_jty_str = ""
 566                 init_meth_params = ""
 567                 init_meth_body = ""
 568                 if "LDK" + var_name in union_enum_items:
 569                     enum_var_lines = union_enum_items["LDK" + var_name]
 570                     for idx, field in enumerate(enum_var_lines):
 571                         if idx != 0 and idx < len(enum_var_lines) - 2:
 572                             field_ty = java_c_types(field.strip(' ;'), None)
 573                             out_java.write("\t\t\tpublic " + field_ty.java_ty + " " + field_ty.var_name + ";\n")
 574                             init_meth_jty_str = init_meth_jty_str + field_ty.java_fn_ty_arg
 575                             if idx > 1:
 576                                 init_meth_params = init_meth_params + ", "
 577                             init_meth_params = init_meth_params + field_ty.java_ty + " " + field_ty.var_name
 578                             init_meth_body = init_meth_body + "this." + field_ty.var_name + " = " + field_ty.var_name + "; "
 579                     out_java.write("\t\t\t" + var_name + "(" + init_meth_params + ") { ")
 580                     out_java.write(init_meth_body)
 581                     out_java.write("}\n")
 582                 out_java.write("\t\t}\n")
 583                 init_meth_jty_strs[var_name] = init_meth_jty_str
 584         out_java.write("\tstatic { " + struct_name + ".init(); }\n")
 585         out_java.write("\tpublic static native " + struct_name + " " + struct_name + "_ref_from_ptr(long ptr);\n");
 586
 587         out_c.write("JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_00024" + struct_name.replace("_", "_1") + "_init (JNIEnv * env, jclass _a) {\n")
 588         for idx, struct_line in enumerate(tag_field_lines):
 589             if idx != 0 and idx < len(tag_field_lines) - 3:
 590                 var_name = struct_line.strip(' ,')[len(struct_name) + 1:]
 591                 out_c.write("\t" + struct_name + "_" + var_name + "_class =\n")
 592                 out_c.write("\t\t(*env)->NewGlobalRef(env, (*env)->FindClass(env, \"Lorg/ldk/impl/bindings$" + struct_name + "$" + var_name + ";\"));\n")
 593                 out_c.write("\tDO_ASSERT(" + struct_name + "_" + var_name + "_class != NULL);\n")
 594                 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")
 595                 out_c.write("\tDO_ASSERT(" + struct_name + "_" + var_name + "_meth != NULL);\n")
 596         out_c.write("}\n")
 597         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")
 598         out_c.write("\t" + struct_name + " *obj = (" + struct_name + "*)ptr;\n")
 599         out_c.write("\tswitch(obj->tag) {\n")
 600         for idx, struct_line in enumerate(tag_field_lines):
 601             if idx != 0 and idx < len(tag_field_lines) - 3:
 602                 var_name = struct_line.strip(' ,')[len(struct_name) + 1:]
 603                 out_c.write("\t\tcase " + struct_name + "_" + var_name + ": {\n")
 604                 c_params_text = ""
 605                 if "LDK" + var_name in union_enum_items:
 606                     enum_var_lines = union_enum_items["LDK" + var_name]
 607                     for idx, field in enumerate(enum_var_lines):
 608                         if idx != 0 and idx < len(enum_var_lines) - 2:
 609                             field_map = map_type(field.strip(' ;'), False, None, False)
 610                             if field_map.ret_conv is not None:
 611                                 out_c.write("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t").replace("_env", "env"))
 612                                 out_c.write("obj->" + camel_to_snake(var_name) + "." + field_map.arg_name)
 613                                 out_c.write(field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
 614                                 c_params_text = c_params_text + ", " + field_map.ret_conv_name
 615                             else:
 616                                 c_params_text = c_params_text + ", obj->" + camel_to_snake(var_name) + "." + field_map.arg_name
 617                 out_c.write("\t\t\treturn (*env)->NewObject(env, " + struct_name + "_" + var_name + "_class, " + struct_name + "_" + var_name + "_meth" + c_params_text + ");\n")
 618                 out_c.write("\t\t}\n")
 619         out_c.write("\t\tdefault: abort();\n")
 620         out_c.write("\t}\n}\n")
 621
 622     def map_trait(struct_name, field_var_lines, trait_fn_lines):
 623         with open(sys.argv[3] + "/structs/" + struct_name.replace("LDK","") + ".java", "w") as out_java_trait:
 624             out_c.write("typedef struct " + struct_name + "_JCalls {\n")
 625             out_c.write("\tatomic_size_t refcnt;\n")
 626             out_c.write("\tJavaVM *vm;\n")
 627             out_c.write("\tjweak o;\n")
 628             for var_line in field_var_lines:
 629                 if var_line.group(1) in trait_structs:
 630                     out_c.write("\t" + var_line.group(1) + "_JCalls* " + var_line.group(2) + ";\n")
 631             for fn_line in trait_fn_lines:
 632                 if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
 633                     out_c.write("\tjmethodID " + fn_line.group(2) + "_meth;\n")
 634             out_c.write("} " + struct_name + "_JCalls;\n")
 635
 636             out_java_trait.write("package org.ldk.structs;\n\n")
 637             out_java_trait.write("import org.ldk.impl.bindings;\n\n")
 638             out_java_trait.write("import org.ldk.enums.*;\n\n")
 639             out_java_trait.write("public class " + struct_name.replace("LDK","") + " extends CommonBase {\n")
 640             out_java_trait.write("\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); }\n")
 641             out_java_trait.write("\tpublic " + struct_name.replace("LDK", "") + "(bindings." + struct_name + " arg")
 642             for var_line in field_var_lines:
 643                 if var_line.group(1) in trait_structs:
 644                     out_java_trait.write(", bindings." + var_line.group(1) + " " + var_line.group(2))
 645             out_java_trait.write(") {\n")
 646             out_java_trait.write("\t\tsuper(bindings." + struct_name + "_new(arg")
 647             for var_line in field_var_lines:
 648                 if var_line.group(1) in trait_structs:
 649                     out_java_trait.write(", " + var_line.group(2))
 650             out_java_trait.write("));\n")
 651             out_java_trait.write("\t\tthis.ptrs_to.add(arg);\n")
 652             out_java_trait.write("\t}\n")
 653             out_java_trait.write("\t@Override @SuppressWarnings(\"deprecation\")\n")
 654             out_java_trait.write("\tprotected void finalize() throws Throwable {\n")
 655             out_java_trait.write("\t\tbindings." + struct_name.replace("LDK","") + "_free(ptr); super.finalize();\n")
 656             out_java_trait.write("\t}\n\n")
 657
 658             out_java.write("\tpublic interface " + struct_name + " {\n")
 659             java_meths = []
 660             for fn_line in trait_fn_lines:
 661                 java_meth_descr = "("
 662                 if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
 663                     ret_ty_info = java_c_types(fn_line.group(1), None)
 664
 665                     out_java.write("\t\t " + ret_ty_info.java_ty + " " + fn_line.group(2) + "(")
 666                     is_const = fn_line.group(3) is not None
 667                     out_c.write(fn_line.group(1) + fn_line.group(2) + "_jcall(")
 668                     if is_const:
 669                         out_c.write("const void* this_arg")
 670                     else:
 671                         out_c.write("void* this_arg")
 672
 673                     arg_names = []
 674                     for idx, arg in enumerate(fn_line.group(4).split(',')):
 675                         if arg == "":
 676                             continue
 677                         if idx >= 2:
 678                             out_java.write(", ")
 679                         out_c.write(", ")
 680                         arg_conv_info = map_type(arg, True, None, False)
 681                         out_c.write(arg.strip())
 682                         out_java.write(arg_conv_info.java_ty + " " + arg_conv_info.arg_name)
 683                         arg_names.append(arg_conv_info)
 684                         java_meth_descr = java_meth_descr + arg_conv_info.java_fn_ty_arg
 685                     java_meth_descr = java_meth_descr + ")" + ret_ty_info.java_fn_ty_arg
 686                     java_meths.append(java_meth_descr)
 687
 688                     out_java.write(");\n")
 689                     out_c.write(") {\n")
 690                     out_c.write("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
 691                     out_c.write("\tJNIEnv *env;\n")
 692                     out_c.write("\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_8) == JNI_OK);\n")
 693
 694                     for arg_info in arg_names:
 695                         if arg_info.ret_conv is not None:
 696                             out_c.write("\t" + arg_info.ret_conv[0].replace('\n', '\n\t').replace("_env", "env"));
 697                             out_c.write(arg_info.arg_name)
 698                             out_c.write(arg_info.ret_conv[1].replace('\n', '\n\t').replace("_env", "env") + "\n")
 699
 700                     out_c.write("\tjobject obj = (*env)->NewLocalRef(env, j_calls->o);\n\tDO_ASSERT(obj != NULL);\n")
 701                     if ret_ty_info.c_ty.endswith("Array"):
 702                         assert(ret_ty_info.c_ty == "jbyteArray")
 703                         out_c.write("\tjbyteArray jret = (*env)->CallObjectMethod(env, obj, j_calls->" + fn_line.group(2) + "_meth")
 704                     elif not ret_ty_info.passed_as_ptr:
 705                         out_c.write("\treturn (*env)->Call" + ret_ty_info.java_ty.title() + "Method(env, obj, j_calls->" + fn_line.group(2) + "_meth")
 706                     else:
 707                         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");
 708
 709                     for arg_info in arg_names:
 710                         if arg_info.ret_conv is not None:
 711                             out_c.write(", " + arg_info.ret_conv_name)
 712                         else:
 713                             out_c.write(", " + arg_info.arg_name)
 714                     out_c.write(");\n");
 715                     if ret_ty_info.c_ty.endswith("Array"):
 716                         out_c.write("\t" + ret_ty_info.rust_obj + " ret;\n")
 717                         out_c.write("\t(*env)->GetByteArrayRegion(env, jret, 0, " + ret_ty_info.arr_len + ", ret." + ret_ty_info.arr_access + ");\n")
 718                         out_c.write("\treturn ret;\n")
 719
 720                     if ret_ty_info.passed_as_ptr:
 721                         out_c.write("\t" + fn_line.group(1).strip() + " res = *ret;\n")
 722                         out_c.write("\tFREE(ret);\n")
 723                         out_c.write("\treturn res;\n")
 724                     out_c.write("}\n")
 725                 elif fn_line.group(2) == "free":
 726                     out_c.write("static void " + struct_name + "_JCalls_free(void* this_arg) {\n")
 727                     out_c.write("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
 728                     out_c.write("\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n")
 729                     out_c.write("\t\tJNIEnv *env;\n")
 730                     out_c.write("\t\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_8) == JNI_OK);\n")
 731                     out_c.write("\t\t(*env)->DeleteWeakGlobalRef(env, j_calls->o);\n")
 732                     out_c.write("\t\tFREE(j_calls);\n")
 733                     out_c.write("\t}\n}\n")
 734
 735             # Write out a clone function whether we need one or not, as we use them in moving to rust
 736             out_c.write("static void* " + struct_name + "_JCalls_clone(const void* this_arg) {\n")
 737             out_c.write("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
 738             out_c.write("\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n")
 739             for var_line in field_var_lines:
 740                 if var_line.group(1) in trait_structs:
 741                     out_c.write("\tatomic_fetch_add_explicit(&j_calls->" + var_line.group(2) + "->refcnt, 1, memory_order_release);\n")
 742             out_c.write("\treturn (void*) this_arg;\n")
 743             out_c.write("}\n")
 744
 745             out_java.write("\t}\n")
 746
 747             out_java.write("\tpublic static native long " + struct_name + "_new(" + struct_name + " impl")
 748             out_c.write("static inline " + struct_name + " " + struct_name + "_init (JNIEnv * env, jclass _a, jobject o")
 749             for var_line in field_var_lines:
 750                 if var_line.group(1) in trait_structs:
 751                     out_java.write(", " + var_line.group(1) + " " + var_line.group(2))
 752                     out_c.write(", jobject " + var_line.group(2))
 753             out_java.write(");\n")
 754             out_c.write(") {\n")
 755
 756             out_c.write("\tjclass c = (*env)->GetObjectClass(env, o);\n")
 757             out_c.write("\tDO_ASSERT(c != NULL);\n")
 758             out_c.write("\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n")
 759             out_c.write("\tatomic_init(&calls->refcnt, 1);\n")
 760             out_c.write("\tDO_ASSERT((*env)->GetJavaVM(env, &calls->vm) == 0);\n")
 761             out_c.write("\tcalls->o = (*env)->NewWeakGlobalRef(env, o);\n")
 762             for (fn_line, java_meth_descr) in zip(trait_fn_lines, java_meths):
 763                 if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
 764                     out_c.write("\tcalls->" + fn_line.group(2) + "_meth = (*env)->GetMethodID(env, c, \"" + fn_line.group(2) + "\", \"" + java_meth_descr + "\");\n")
 765                     out_c.write("\tDO_ASSERT(calls->" + fn_line.group(2) + "_meth != NULL);\n")
 766             out_c.write("\n\t" + struct_name + " ret = {\n")
 767             out_c.write("\t\t.this_arg = (void*) calls,\n")
 768             for fn_line in trait_fn_lines:
 769                 if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
 770                     out_c.write("\t\t." + fn_line.group(2) + " = " + fn_line.group(2) + "_jcall,\n")
 771                 elif fn_line.group(2) == "free":
 772                     out_c.write("\t\t.free = " + struct_name + "_JCalls_free,\n")
 773                 else:
 774                     out_c.write("\t\t.clone = " + struct_name + "_JCalls_clone,\n")
 775             for var_line in field_var_lines:
 776                 if var_line.group(1) in trait_structs:
 777                     out_c.write("\t\t." + var_line.group(2) + " = " + var_line.group(1) + "_init(env, _a, " + var_line.group(2) + "),\n")
 778             out_c.write("\t};\n")
 779             for var_line in field_var_lines:
 780                 if var_line.group(1) in trait_structs:
 781                     out_c.write("\tcalls->" + var_line.group(2) + " = ret." + var_line.group(2) + ".this_arg;\n")
 782             out_c.write("\treturn ret;\n")
 783             out_c.write("}\n")
 784
 785             out_c.write("JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1new (JNIEnv * env, jclass _a, jobject o")
 786             for var_line in field_var_lines:
 787                 if var_line.group(1) in trait_structs:
 788                     out_c.write(", jobject " + var_line.group(2))
 789             out_c.write(") {\n")
 790             out_c.write("\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n")
 791             out_c.write("\t*res_ptr = " + struct_name + "_init(env, _a, o")
 792             for var_line in field_var_lines:
 793                 if var_line.group(1) in trait_structs:
 794                     out_c.write(", " + var_line.group(2))
 795             out_c.write(");\n")
 796             out_c.write("\treturn (long)res_ptr;\n")
 797             out_c.write("}\n")
 798
 799             out_java.write("\tpublic static native " + struct_name + " " + struct_name + "_get_obj_from_jcalls(long val);\n")
 800             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")
 801             out_c.write("\tjobject ret = (*env)->NewLocalRef(env, ((" + struct_name + "_JCalls*)val)->o);\n")
 802             out_c.write("\tDO_ASSERT(ret != NULL);\n")
 803             out_c.write("\treturn ret;\n")
 804             out_c.write("}\n")
 805
 806         for fn_line in trait_fn_lines:
 807             # For now, just disable enabling the _call_log - we don't know how to inverse-map String
 808             is_log = fn_line.group(2) == "log" and struct_name == "LDKLogger"
 809             if fn_line.group(2) != "free" and fn_line.group(2) != "clone" and fn_line.group(2) != "eq" and not is_log:
 810                 dummy_line = fn_line.group(1) + struct_name.replace("LDK", "") + "_call_" + fn_line.group(2) + " " + struct_name + "* this_arg" + fn_line.group(4) + "\n"
 811                 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")
 812
 813     out_c.write("""#include \"org_ldk_impl_bindings.h\"
 814 #include <rust_types.h>
 815 #include <lightning.h>
 816 #include <string.h>
 817 #include <stdatomic.h>
 818 """)
 819
 820     if sys.argv[4] == "false":
 821         out_c.write("#define MALLOC(a, _) malloc(a)\n")
 822         out_c.write("#define FREE free\n")
 823         out_c.write("#define DO_ASSERT(a) (void)(a)\n")
 824     else:
 825         out_c.write("""#include <assert.h>
 826 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
 827
 828 // Running a leak check across all the allocations and frees of the JDK is a mess,
 829 // so instead we implement our own naive leak checker here, relying on the -wrap
 830 // linker option to wrap malloc/calloc/realloc/free, tracking everyhing allocated
 831 // and free'd in Rust or C across the generated bindings shared library.
 832 #include <threads.h>
 833 #include <execinfo.h>
 834 #include <unistd.h>
 835 static mtx_t allocation_mtx;
 836
 837 void __attribute__((constructor)) init_mtx() {
 838         DO_ASSERT(mtx_init(&allocation_mtx, mtx_plain) == thrd_success);
 839 }
 840
 841 #define BT_MAX 128
 842 typedef struct allocation {
 843         struct allocation* next;
 844         void* ptr;
 845         const char* struct_name;
 846         void* bt[BT_MAX];
 847         int bt_len;
 848 } allocation;
 849 static allocation* allocation_ll = NULL;
 850
 851 void* __real_malloc(size_t len);
 852 void* __real_calloc(size_t nmemb, size_t len);
 853 static void new_allocation(void* res, const char* struct_name) {
 854         allocation* new_alloc = __real_malloc(sizeof(allocation));
 855         new_alloc->ptr = res;
 856         new_alloc->struct_name = struct_name;
 857         new_alloc->bt_len = backtrace(new_alloc->bt, BT_MAX);
 858         DO_ASSERT(mtx_lock(&allocation_mtx) == thrd_success);
 859         new_alloc->next = allocation_ll;
 860         allocation_ll = new_alloc;
 861         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
 862 }
 863 static void* MALLOC(size_t len, const char* struct_name) {
 864         void* res = __real_malloc(len);
 865         new_allocation(res, struct_name);
 866         return res;
 867 }
 868 void __real_free(void* ptr);
 869 static void alloc_freed(void* ptr) {
 870         allocation* p = NULL;
 871         DO_ASSERT(mtx_lock(&allocation_mtx) == thrd_success);
 872         allocation* it = allocation_ll;
 873         while (it->ptr != ptr) { p = it; it = it->next; }
 874         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
 875         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
 876         DO_ASSERT(it->ptr == ptr);
 877         __real_free(it);
 878 }
 879 static void FREE(void* ptr) {
 880         alloc_freed(ptr);
 881         __real_free(ptr);
 882 }
 883
 884 void* __wrap_malloc(size_t len) {
 885         void* res = __real_malloc(len);
 886         new_allocation(res, "malloc call");
 887         return res;
 888 }
 889 void* __wrap_calloc(size_t nmemb, size_t len) {
 890         void* res = __real_calloc(nmemb, len);
 891         new_allocation(res, "calloc call");
 892         return res;
 893 }
 894 void __wrap_free(void* ptr) {
 895         alloc_freed(ptr);
 896         __real_free(ptr);
 897 }
 898
 899 void* __real_realloc(void* ptr, size_t newlen);
 900 void* __wrap_realloc(void* ptr, size_t len) {
 901         alloc_freed(ptr);
 902         void* res = __real_realloc(ptr, len);
 903         new_allocation(res, "realloc call");
 904         return res;
 905 }
 906 void __wrap_reallocarray(void* ptr, size_t new_sz) {
 907         // Rust doesn't seem to use reallocarray currently
 908         assert(false);
 909 }
 910
 911 void __attribute__((destructor)) check_leaks() {
 912         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 913                 fprintf(stderr, "%s %p remains:\\n", a->struct_name, a->ptr);
 914                 backtrace_symbols_fd(a->bt, a->bt_len, STDERR_FILENO);
 915                 fprintf(stderr, "\\n\\n");
 916         }
 917         DO_ASSERT(allocation_ll == NULL);
 918 }
 919 """)
 920     out_java.write("""package org.ldk.impl;
 921 import org.ldk.enums.*;
 922
 923 public class bindings {
 924         public static class VecOrSliceDef {
 925                 public long dataptr;
 926                 public long datalen;
 927                 public long stride;
 928                 public VecOrSliceDef(long dataptr, long datalen, long stride) {
 929                         this.dataptr = dataptr; this.datalen = datalen; this.stride = stride;
 930                 }
 931         }
 932         static {
 933                 System.loadLibrary(\"lightningjni\");
 934                 init(java.lang.Enum.class, VecOrSliceDef.class);
 935         }
 936         static native void init(java.lang.Class c, java.lang.Class slicedef);
 937
 938         public static native boolean deref_bool(long ptr);
 939         public static native long deref_long(long ptr);
 940         public static native void free_heap_ptr(long ptr);
 941         public static native byte[] read_bytes(long ptr, long len);
 942         public static native byte[] get_u8_slice_bytes(long slice_ptr);
 943         public static native long bytes_to_u8_vec(byte[] bytes);
 944         public static native long new_txpointer_copy_data(byte[] txdata);
 945         public static native long vec_slice_len(long vec);
 946         public static native long new_empty_slice_vec();
 947
 948 """)
 949     out_c.write("""
 950 static jmethodID ordinal_meth = NULL;
 951 static jmethodID slicedef_meth = NULL;
 952 static jclass slicedef_cls = NULL;
 953 JNIEXPORT void Java_org_ldk_impl_bindings_init(JNIEnv * env, jclass _b, jclass enum_class, jclass slicedef_class) {
 954         ordinal_meth = (*env)->GetMethodID(env, enum_class, "ordinal", "()I");
 955         DO_ASSERT(ordinal_meth != NULL);
 956         slicedef_meth = (*env)->GetMethodID(env, slicedef_class, "<init>", "(JJJ)V");
 957         DO_ASSERT(slicedef_meth != NULL);
 958         slicedef_cls = (*env)->NewGlobalRef(env, slicedef_class);
 959         DO_ASSERT(slicedef_cls != NULL);
 960 }
 961
 962 JNIEXPORT jboolean JNICALL Java_org_ldk_impl_bindings_deref_1bool (JNIEnv * env, jclass _a, jlong ptr) {
 963         return *((bool*)ptr);
 964 }
 965 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_deref_1long (JNIEnv * env, jclass _a, jlong ptr) {
 966         return *((long*)ptr);
 967 }
 968 JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_free_1heap_1ptr (JNIEnv * env, jclass _a, jlong ptr) {
 969         FREE((void*)ptr);
 970 }
 971 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_read_1bytes (JNIEnv * _env, jclass _b, jlong ptr, jlong len) {
 972         jbyteArray ret_arr = (*_env)->NewByteArray(_env, len);
 973         (*_env)->SetByteArrayRegion(_env, ret_arr, 0, len, (unsigned char*)ptr);
 974         return ret_arr;
 975 }
 976 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_get_1u8_1slice_1bytes (JNIEnv * _env, jclass _b, jlong slice_ptr) {
 977         LDKu8slice *slice = (LDKu8slice*)slice_ptr;
 978         jbyteArray ret_arr = (*_env)->NewByteArray(_env, slice->datalen);
 979         (*_env)->SetByteArrayRegion(_env, ret_arr, 0, slice->datalen, slice->data);
 980         return ret_arr;
 981 }
 982 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_bytes_1to_1u8_1vec (JNIEnv * _env, jclass _b, jbyteArray bytes) {
 983         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "LDKCVec_u8");
 984         vec->datalen = (*_env)->GetArrayLength(_env, bytes);
 985         vec->data = (uint8_t*)MALLOC(vec->datalen, "LDKCVec_u8Z Bytes");
 986         (*_env)->GetByteArrayRegion (_env, bytes, 0, vec->datalen, vec->data);
 987         return (long)vec;
 988 }
 989 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_new_1txpointer_1copy_1data (JNIEnv * env, jclass _b, jbyteArray bytes) {
 990         LDKTransaction *txdata = (LDKTransaction*)MALLOC(sizeof(LDKTransaction), "LDKTransaction");
 991         txdata->datalen = (*env)->GetArrayLength(env, bytes);
 992         txdata->data = (uint8_t*)MALLOC(txdata->datalen, "Tx Data Bytes");
 993         txdata->data_is_owned = true;
 994         (*env)->GetByteArrayRegion (env, bytes, 0, txdata->datalen, txdata->data);
 995         return (long)txdata;
 996 }
 997 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_vec_1slice_1len (JNIEnv * env, jclass _a, jlong ptr) {
 998         // Check offsets of a few Vec types are all consistent as we're meant to be generic across types
 999         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_SignatureZ, datalen), "Vec<*> needs to be mapped identically");
1000         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_MessageSendEventZ, datalen), "Vec<*> needs to be mapped identically");
1001         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_EventZ, datalen), "Vec<*> needs to be mapped identically");
1002         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_C2Tuple_usizeTransactionZZ, datalen), "Vec<*> needs to be mapped identically");
1003         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)ptr;
1004         return (long)vec->datalen;
1005 }
1006 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_new_1empty_1slice_1vec (JNIEnv * _env, jclass _b) {
1007         // Check sizes of a few Vec types are all consistent as we're meant to be generic across types
1008         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_SignatureZ), "Vec<*> needs to be mapped identically");
1009         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_MessageSendEventZ), "Vec<*> needs to be mapped identically");
1010         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_EventZ), "Vec<*> needs to be mapped identically");
1011         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_C2Tuple_usizeTransactionZZ), "Vec<*> needs to be mapped identically");
1012         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "Empty LDKCVec");
1013         vec->data = NULL;
1014         vec->datalen = 0;
1015         return (long)vec;
1016 }
1017
1018 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
1019 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
1020 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
1021 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
1022
1023 """)
1024
1025     with open(sys.argv[3] + "/structs/CommonBase.java", "a") as out_java_struct:
1026         out_java_struct.write("""package org.ldk.structs;
1027 import java.util.LinkedList;
1028 class CommonBase {
1029         final long ptr;
1030         LinkedList<Object> ptrs_to = new LinkedList();
1031         protected CommonBase(long ptr) { this.ptr = ptr; }
1032         public long _test_only_get_ptr() { return this.ptr; }
1033 }
1034 """)
1035
1036     in_block_comment = False
1037     cur_block_obj = None
1038
1039     const_val_regex = re.compile("^extern const ([A-Za-z_0-9]*) ([A-Za-z_0-9]*);$")
1040
1041     line_indicates_result_regex = re.compile("^   (LDKCResultPtr_[A-Za-z_0-9]*) contents;$")
1042     line_indicates_vec_regex = re.compile("^   ([A-Za-z_0-9]*) \*data;$")
1043     line_indicates_opaque_regex = re.compile("^   bool is_owned;$")
1044     line_indicates_trait_regex = re.compile("^   ([A-Za-z_0-9]* \*?)\(\*([A-Za-z_0-9]*)\)\((const )?void \*this_arg(.*)\);$")
1045     assert(line_indicates_trait_regex.match("   uintptr_t (*send_data)(void *this_arg, LDKu8slice data, bool resume_read);"))
1046     assert(line_indicates_trait_regex.match("   LDKCVec_MessageSendEventZ (*get_and_clear_pending_msg_events)(const void *this_arg);"))
1047     assert(line_indicates_trait_regex.match("   void *(*clone)(const void *this_arg);"))
1048     line_field_var_regex = re.compile("^   ([A-Za-z_0-9]*) ([A-Za-z_0-9]*);$")
1049     assert(line_field_var_regex.match("   LDKMessageSendEventsProvider MessageSendEventsProvider;"))
1050     struct_name_regex = re.compile("^typedef (struct|enum|union) (MUST_USE_STRUCT )?(LDK[A-Za-z_0-9]*) {$")
1051     assert(struct_name_regex.match("typedef struct LDKCVecTempl_u8 {"))
1052     assert(struct_name_regex.match("typedef enum LDKNetwork {"))
1053     struct_alias_regex = re.compile("^typedef (LDK[A-Za-z_0-9]*) (LDK[A-Za-z_0-9]*);$")
1054     assert(struct_alias_regex.match("typedef LDKCResultTempl_bool__PeerHandleError LDKCResult_boolPeerHandleErrorZ;"))
1055
1056     result_templ_structs = set()
1057     union_enum_items = {}
1058     result_ptr_struct_items = {}
1059     for line in in_h:
1060         if in_block_comment:
1061             if line.endswith("*/\n"):
1062                 in_block_comment = False
1063         elif cur_block_obj is not None:
1064             cur_block_obj  = cur_block_obj + line
1065             if line.startswith("} "):
1066                 field_lines = []
1067                 struct_name = None
1068                 vec_ty = None
1069                 obj_lines = cur_block_obj.split("\n")
1070                 is_opaque = False
1071                 result_contents = None
1072                 is_unitary_enum = False
1073                 is_union_enum = False
1074                 is_union = False
1075                 is_tuple = False
1076                 trait_fn_lines = []
1077                 field_var_lines = []
1078
1079                 for idx, struct_line in enumerate(obj_lines):
1080                     if struct_line.strip().startswith("/*"):
1081                         in_block_comment = True
1082                     if in_block_comment:
1083                         if struct_line.endswith("*/"):
1084                             in_block_comment = False
1085                     else:
1086                         struct_name_match = struct_name_regex.match(struct_line)
1087                         if struct_name_match is not None:
1088                             struct_name = struct_name_match.group(3)
1089                             if struct_name_match.group(1) == "enum":
1090                                 if not struct_name.endswith("_Tag"):
1091                                     is_unitary_enum = True
1092                                 else:
1093                                     is_union_enum = True
1094                             elif struct_name_match.group(1) == "union":
1095                                 is_union = True
1096                         if line_indicates_opaque_regex.match(struct_line):
1097                             is_opaque = True
1098                         result_match = line_indicates_result_regex.match(struct_line)
1099                         if result_match is not None:
1100                             result_contents = result_match.group(1)
1101                         vec_ty_match = line_indicates_vec_regex.match(struct_line)
1102                         if vec_ty_match is not None and struct_name.startswith("LDKCVecTempl_"):
1103                             vec_ty = vec_ty_match.group(1)
1104                         elif struct_name.startswith("LDKC2TupleTempl_") or struct_name.startswith("LDKC3TupleTempl_"):
1105                             is_tuple = True
1106                         trait_fn_match = line_indicates_trait_regex.match(struct_line)
1107                         if trait_fn_match is not None:
1108                             trait_fn_lines.append(trait_fn_match)
1109                         field_var_match = line_field_var_regex.match(struct_line)
1110                         if field_var_match is not None:
1111                             field_var_lines.append(field_var_match)
1112                         field_lines.append(struct_line)
1113
1114                 assert(struct_name is not None)
1115                 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))
1116                 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))
1117                 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))
1118                 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))
1119                 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))
1120                 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))
1121                 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))
1122
1123                 if is_opaque:
1124                     opaque_structs.add(struct_name)
1125                     with open(sys.argv[3] + "/structs/" + struct_name.replace("LDK","") + ".java", "w") as out_java_struct:
1126                         out_java_struct.write("package org.ldk.structs;\n\n")
1127                         out_java_struct.write("import org.ldk.impl.bindings;\n")
1128                         out_java_struct.write("import org.ldk.enums.*;\n\n")
1129                         out_java_struct.write("public class " + struct_name.replace("LDK","") + " extends CommonBase {\n")
1130                         out_java_struct.write("\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); }\n")
1131                         out_java_struct.write("\t@Override @SuppressWarnings(\"deprecation\")\n")
1132                         out_java_struct.write("\tprotected void finalize() throws Throwable {\n")
1133                         out_java_struct.write("\t\tbindings." + struct_name.replace("LDK","") + "_free(ptr); super.finalize();\n")
1134                         out_java_struct.write("\t}\n\n")
1135                 elif result_contents is not None:
1136                     result_templ_structs.add(struct_name)
1137                     assert result_contents in result_ptr_struct_items
1138                 elif struct_name.startswith("LDKCResultPtr_"):
1139                     for line in field_lines:
1140                         if line.endswith("*result;"):
1141                             res_ty = line[:-8].strip()
1142                         elif line.endswith("*err;"):
1143                             err_ty = line[:-5].strip()
1144                     result_ptr_struct_items[struct_name] = (res_ty, err_ty)
1145                 elif is_tuple:
1146                     out_java.write("\tpublic static native long " + struct_name + "_new(")
1147                     out_c.write("JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1new(JNIEnv *_env, jclass _b")
1148                     for idx, line in enumerate(field_lines):
1149                         if idx != 0 and idx < len(field_lines) - 2:
1150                             ty_info = java_c_types(line.strip(';'), None)
1151                             if idx != 1:
1152                                 out_java.write(", ")
1153                             e = chr(ord('a') + idx - 1)
1154                             out_java.write(ty_info.java_ty + " " + e)
1155                             out_c.write(", " + ty_info.c_ty + " " + e)
1156                     out_java.write(");\n")
1157                     out_c.write(") {\n")
1158                     out_c.write("\t" + struct_name + "* ret = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n")
1159                     for idx, line in enumerate(field_lines):
1160                         if idx != 0 and idx < len(field_lines) - 2:
1161                             ty_info = map_type(line.strip(';'), False, None, False)
1162                             e = chr(ord('a') + idx - 1)
1163                             if ty_info.arg_conv is not None:
1164                                 out_c.write("\t" + ty_info.arg_conv.replace("\n", "\n\t"))
1165                                 out_c.write("\n\tret->" + e + " = " + ty_info.arg_conv_name + ";\n")
1166                             else:
1167                                 out_c.write("\tret->" + e + " = " + e + ";\n")
1168                     out_c.write("\treturn (long)ret;\n")
1169                     out_c.write("}\n")
1170                 elif vec_ty is not None:
1171                     if vec_ty in opaque_structs:
1172                         out_java.write("\tpublic static native long[] " + struct_name + "_arr_info(long vec_ptr);\n")
1173                         out_c.write("JNIEXPORT jlongArray JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1arr_1info(JNIEnv *env, jclass _b, jlong ptr) {\n")
1174                     else:
1175                         out_java.write("\tpublic static native VecOrSliceDef " + struct_name + "_arr_info(long vec_ptr);\n")
1176                         out_c.write("JNIEXPORT jobject JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1arr_1info(JNIEnv *env, jclass _b, jlong ptr) {\n")
1177                     out_c.write("\t" + struct_name + " *vec = (" + struct_name + "*)ptr;\n")
1178                     if vec_ty in opaque_structs:
1179                         out_c.write("\tjlongArray ret = (*env)->NewLongArray(env, vec->datalen);\n")
1180                         out_c.write("\tjlong *ret_elems = (*env)->GetPrimitiveArrayCritical(env, ret, NULL);\n")
1181                         out_c.write("\tfor (size_t i = 0; i < vec->datalen; i++) {\n")
1182                         out_c.write("\t\tDO_ASSERT((((long)vec->data[i].inner) & 1) == 0);\n")
1183                         out_c.write("\t\tret_elems[i] = (long)vec->data[i].inner | (vec->data[i].is_owned ? 1 : 0);\n")
1184                         out_c.write("\t}\n")
1185                         out_c.write("\t(*env)->ReleasePrimitiveArrayCritical(env, ret, ret_elems, 0);\n")
1186                         out_c.write("\treturn ret;\n")
1187                     else:
1188                         out_c.write("\treturn (*env)->NewObject(env, slicedef_cls, slicedef_meth, (long)vec->data, (long)vec->datalen, sizeof(" + vec_ty + "));\n")
1189                     out_c.write("}\n")
1190
1191                     ty_info = map_type(vec_ty + " arr_elem", False, None, False)
1192                     if len(ty_info.java_fn_ty_arg) == 1: # ie we're a primitive of some form
1193                         out_java.write("\tpublic static native long " + struct_name + "_new(" + ty_info.java_ty + "[] elems);\n")
1194                         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")
1195                         out_c.write("\t" + struct_name + " *ret = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n")
1196                         out_c.write("\tret->datalen = (*env)->GetArrayLength(env, elems);\n")
1197                         out_c.write("\tif (ret->datalen == 0) {\n")
1198                         out_c.write("\t\tret->data = NULL;\n")
1199                         out_c.write("\t} else {\n")
1200                         out_c.write("\t\tret->data = MALLOC(sizeof(" + vec_ty + ") * ret->datalen, \"" + struct_name + " Data\");\n")
1201                         out_c.write("\t\t" + ty_info.c_ty + " *java_elems = (*env)->GetPrimitiveArrayCritical(env, elems, NULL);\n")
1202                         out_c.write("\t\tfor (size_t i = 0; i < ret->datalen; i++) {\n")
1203                         if ty_info.arg_conv is not None:
1204                             out_c.write("\t\t\t" + ty_info.c_ty + " arr_elem = java_elems[i];\n")
1205                             out_c.write("\t\t\t" + ty_info.arg_conv.replace("\n", "\n\t\t\t") + "\n")
1206                             out_c.write("\t\t\tret->data[i] = " + ty_info.arg_conv_name + ";\n")
1207                         else:
1208                             out_c.write("\t\t\tret->data[i] = java_elems[i];\n")
1209                         out_c.write("\t\t}\n")
1210                         out_c.write("\t\t(*env)->ReleasePrimitiveArrayCritical(env, elems, java_elems, 0);\n")
1211                         out_c.write("\t}\n")
1212                         out_c.write("\treturn (long)ret;\n")
1213                         out_c.write("}\n")
1214                 elif is_union_enum:
1215                     assert(struct_name.endswith("_Tag"))
1216                     struct_name = struct_name[:-4]
1217                     union_enum_items[struct_name] = {"field_lines": field_lines}
1218                 elif struct_name.endswith("_Body") and struct_name.split("_")[0] in union_enum_items:
1219                     enum_var_name = struct_name.split("_")
1220                     union_enum_items[enum_var_name[0]][enum_var_name[1]] = field_lines
1221                 elif struct_name in union_enum_items:
1222                     map_complex_enum(struct_name, union_enum_items[struct_name])
1223                 elif is_unitary_enum:
1224                     map_unitary_enum(struct_name, field_lines)
1225                 elif len(trait_fn_lines) > 0:
1226                     trait_structs.add(struct_name)
1227                     map_trait(struct_name, field_var_lines, trait_fn_lines)
1228                 cur_block_obj = None
1229         else:
1230             fn_ptr = fn_ptr_regex.match(line)
1231             fn_ret_arr = fn_ret_arr_regex.match(line)
1232             reg_fn = reg_fn_regex.match(line)
1233             const_val = const_val_regex.match(line)
1234
1235             if line.startswith("#include <"):
1236                 pass
1237             elif line.startswith("/*"):
1238                 #out_java.write("\t" + line)
1239                 if not line.endswith("*/\n"):
1240                     in_block_comment = True
1241             elif line.startswith("typedef enum "):
1242                 cur_block_obj = line
1243             elif line.startswith("typedef struct "):
1244                 cur_block_obj = line
1245             elif line.startswith("typedef union "):
1246                 cur_block_obj = line
1247             elif line.startswith("typedef "):
1248                 alias_match =  struct_alias_regex.match(line)
1249                 if alias_match.group(1) in result_templ_structs:
1250                     out_java.write("\tpublic static native boolean " + alias_match.group(2) + "_result_ok(long arg);\n")
1251                     out_java.write("\tpublic static native long " + alias_match.group(2) + "_get_inner(long arg);\n")
1252                     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")
1253                     out_c.write("\treturn ((" + alias_match.group(2) + "*)arg)->result_ok;\n")
1254                     out_c.write("}\n")
1255                     out_c.write("JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_" + alias_match.group(2).replace("_", "_1") + "_1get_1inner (JNIEnv * env, jclass _a, jlong arg) {\n")
1256                     contents_ty = alias_match.group(1).replace("LDKCResultTempl", "LDKCResultPtr")
1257                     res_ty, err_ty = result_ptr_struct_items[contents_ty]
1258                     out_c.write("\t" + alias_match.group(2) + " *val = (" + alias_match.group(2) + "*)arg;\n")
1259                     out_c.write("\tif (val->result_ok) {\n")
1260                     if res_ty not in opaque_structs:
1261                         out_c.write("\t\treturn (long)val->contents.result;\n")
1262                     else:
1263                         out_c.write("\t\treturn (long)(val->contents.result->inner) | (val->contents.result->is_owned ? 1 : 0);\n")
1264                     out_c.write("\t} else {\n")
1265                     if err_ty not in opaque_structs:
1266                         out_c.write("\t\treturn (long)val->contents.err;\n")
1267                     else:
1268                         out_c.write("\t\treturn (long)(val->contents.err->inner) | (val->contents.err->is_owned ? 1 : 0);\n")
1269                     out_c.write("\t}\n}\n")
1270                 pass
1271             elif fn_ptr is not None:
1272                 map_fn(line, fn_ptr, None, None)
1273             elif fn_ret_arr is not None:
1274                 map_fn(line, fn_ret_arr, fn_ret_arr.group(4), None)
1275             elif reg_fn is not None:
1276                 map_fn(line, reg_fn, None, None)
1277             elif const_val_regex is not None:
1278                 # TODO Map const variables
1279                 pass
1280             else:
1281                 assert(line == "\n")
1282
1283     out_java.write("}\n")
1284     for struct_name in opaque_structs:
1285         with open(sys.argv[3] + "/structs/" + struct_name.replace("LDK","") + ".java", "a") as out_java_struct:
1286             out_java_struct.write("}\n")
1287     for struct_name in trait_structs:
1288         with open(sys.argv[3] + "/structs/" + struct_name.replace("LDK","") + ".java", "a") as out_java_struct:
1289             out_java_struct.write("}\n")