_ 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("LDKSignature"):
 122         #    fn_arg = "uint8_t (*" + fn_arg[13:] + ")[64]"
 123         #    assert var_is_arr_regex.match(fn_arg[8:])
 124         #    rust_obj = "LDKSignature"
 125
 126         if fn_arg.startswith("void"):
 127             java_ty = "void"
 128             c_ty = "void"
 129             fn_ty_arg = "V"
 130             fn_arg = fn_arg[4:].strip()
 131         elif fn_arg.startswith("bool"):
 132             java_ty = "boolean"
 133             c_ty = "jboolean"
 134             fn_ty_arg = "Z"
 135             fn_arg = fn_arg[4:].strip()
 136         elif fn_arg.startswith("uint8_t"):
 137             java_ty = "byte"
 138             c_ty = "jbyte"
 139             fn_ty_arg = "B"
 140             fn_arg = fn_arg[7:].strip()
 141         elif fn_arg.startswith("uint16_t"):
 142             java_ty = "short"
 143             c_ty = "jshort"
 144             fn_ty_arg = "S"
 145             fn_arg = fn_arg[8:].strip()
 146         elif fn_arg.startswith("uint32_t"):
 147             java_ty = "int"
 148             c_ty = "jint"
 149             fn_ty_arg = "I"
 150             fn_arg = fn_arg[8:].strip()
 151         elif fn_arg.startswith("uint64_t") or fn_arg.startswith("uintptr_t"):
 152             java_ty = "long"
 153             c_ty = "jlong"
 154             fn_ty_arg = "J"
 155             if fn_arg.startswith("uint64_t"):
 156                 fn_arg = fn_arg[8:].strip()
 157             else:
 158                 fn_arg = fn_arg[9:].strip()
 159         elif is_const and fn_arg.startswith("char *"):
 160             java_ty = "String"
 161             c_ty = "const char*"
 162             fn_ty_arg = "Ljava/lang/String;"
 163             fn_arg = fn_arg[6:].strip()
 164         else:
 165             ma = var_ty_regex.match(fn_arg)
 166             if ma.group(1).strip() in unitary_enums:
 167                 java_ty = ma.group(1).strip()
 168                 c_ty = "jclass"
 169                 fn_ty_arg = "Lorg/ldk/enums/" + ma.group(1).strip() + ";"
 170                 fn_arg = ma.group(2).strip()
 171                 rust_obj = ma.group(1).strip()
 172                 take_by_ptr = True
 173             else:
 174                 java_ty = "long"
 175                 c_ty = "jlong"
 176                 fn_ty_arg = "J"
 177                 fn_arg = ma.group(2).strip()
 178                 rust_obj = ma.group(1).strip()
 179                 take_by_ptr = True
 180
 181         if fn_arg.startswith(" *") or fn_arg.startswith("*"):
 182             fn_arg = fn_arg.replace("*", "").strip()
 183             is_ptr = True
 184             c_ty = "jlong"
 185             java_ty = "long"
 186             fn_ty_arg = "J"
 187
 188         var_is_arr = var_is_arr_regex.match(fn_arg)
 189         if var_is_arr is not None or ret_arr_len is not None:
 190             assert(not take_by_ptr)
 191             assert(not is_ptr)
 192             java_ty = java_ty + "[]"
 193             c_ty = c_ty + "Array"
 194             if var_is_arr is not None:
 195                 if var_is_arr.group(1) == "":
 196                     return TypeInfo(rust_obj=rust_obj, java_ty=java_ty, java_fn_ty_arg="[" + fn_ty_arg, c_ty=c_ty,
 197                         passed_as_ptr=False, is_ptr=False, var_name="arg", arr_len=var_is_arr.group(2), arr_access=arr_access)
 198                 return TypeInfo(rust_obj=rust_obj, java_ty=java_ty, java_fn_ty_arg="[" + fn_ty_arg, c_ty=c_ty,
 199                     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)
 200         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,
 201             is_ptr=is_ptr, var_name=fn_arg, arr_len=None, arr_access=None)
 202
 203     def map_type(fn_arg, print_void, ret_arr_len, is_free):
 204         ty_info = java_c_types(fn_arg, ret_arr_len)
 205
 206         if ty_info.c_ty == "void":
 207             if not print_void:
 208                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 209                     arg_conv = None, arg_conv_name = None, ret_conv = None, ret_conv_name = None)
 210
 211         if ty_info.c_ty.endswith("Array"):
 212             arr_len = ty_info.arr_len
 213             if arr_len is not None:
 214                 arr_name = ty_info.var_name
 215             else:
 216                 arr_name = "ret"
 217                 arr_len = ret_arr_len
 218             assert(ty_info.c_ty == "jbyteArray")
 219             if ty_info.rust_obj is not None:
 220                 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 + ");"
 221                 arr_access = ("", "." + ty_info.arr_access)
 222             else:
 223                 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;"
 224                 arr_access = ("*", "")
 225             return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 226                 arg_conv = arg_conv,
 227                 arg_conv_name = arr_name + "_ref",
 228                 ret_conv = ("jbyteArray " + arr_name + "_arr = (*_env)->NewByteArray(_env, " + arr_len + ");\n" +
 229                     "(*_env)->SetByteArrayRegion(_env, " + arr_name + "_arr, 0, " + arr_len + ", " + arr_access[0],
 230                     arr_access[1] + ");"),
 231                 ret_conv_name = arr_name + "_arr")
 232         elif ty_info.var_name != "":
 233             # If we have a parameter name, print it (noting that it may indicate its a pointer)
 234             if ty_info.rust_obj is not None:
 235                 assert(ty_info.passed_as_ptr)
 236                 opaque_arg_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv;\n"
 237                 opaque_arg_conv = opaque_arg_conv + ty_info.var_name + "_conv.inner = (void*)(" + ty_info.var_name + " & (~1));\n"
 238                 opaque_arg_conv = opaque_arg_conv + ty_info.var_name + "_conv.is_owned = (" + ty_info.var_name + " & 1) || (" + ty_info.var_name + " == 0);"
 239                 if (ty_info.rust_obj.replace("LDK", "") + "_clone") in clone_fns and not ty_info.is_ptr and not is_free:
 240                     # 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.
 241                     opaque_arg_conv = opaque_arg_conv + "\nif (" + ty_info.var_name + "_conv.inner != NULL)\n"
 242                     opaque_arg_conv = opaque_arg_conv + "\t" + ty_info.var_name + "_conv = " + ty_info.rust_obj.replace("LDK", "") + "_clone(&" + ty_info.var_name + "_conv);"
 243                 if not ty_info.is_ptr:
 244                     if ty_info.rust_obj in unitary_enums:
 245                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 246                             arg_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv = " + ty_info.rust_obj + "_from_java(_env, " + ty_info.var_name + ");",
 247                             arg_conv_name = ty_info.var_name + "_conv",
 248                             ret_conv = ("jclass " + ty_info.var_name + "_conv = " + ty_info.rust_obj + "_to_java(_env, ", ");"),
 249                             ret_conv_name = ty_info.var_name + "_conv")
 250                     if ty_info.rust_obj in opaque_structs:
 251                         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"
 252                         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"
 253                         ret_conv_suf = ret_conv_suf + "long " + ty_info.var_name + "_ref;\n"
 254                         ret_conv_suf = ret_conv_suf + "if (" + ty_info.var_name + "_var.is_owned) {\n"
 255                         ret_conv_suf = ret_conv_suf + "\t" + ty_info.var_name + "_ref = (long)" + ty_info.var_name + "_var.inner | 1;\n"
 256                         ret_conv_suf = ret_conv_suf + "} else {\n"
 257                         ret_conv_suf = ret_conv_suf + "\t" + ty_info.var_name + "_ref = (long)&" + ty_info.var_name + "_var;\n"
 258                         ret_conv_suf = ret_conv_suf + "}"
 259                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 260                             arg_conv = opaque_arg_conv, arg_conv_name = ty_info.var_name + "_conv",
 261                             ret_conv = (ty_info.rust_obj + " " + ty_info.var_name + "_var = ", ret_conv_suf),
 262                             ret_conv_name = ty_info.var_name + "_ref")
 263                     base_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv = *(" + ty_info.rust_obj + "*)" + ty_info.var_name + ";";
 264                     if ty_info.rust_obj in trait_structs:
 265                         if not is_free:
 266                             base_conv = base_conv + "\nif (" + ty_info.var_name + "_conv.free == " + ty_info.rust_obj + "_JCalls_free) {\n"
 267                             base_conv = base_conv + "\t// If this_arg is a JCalls struct, then we need to increment the refcnt in it.\n"
 268                             base_conv = base_conv + "\t" + ty_info.rust_obj + "_JCalls_clone(" + ty_info.var_name + "_conv.this_arg);\n}"
 269                         else:
 270                             base_conv = base_conv + "\n" + "FREE((void*)" + ty_info.var_name + ");"
 271                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 272                             arg_conv = base_conv,
 273                             arg_conv_name = ty_info.var_name + "_conv",
 274                             ret_conv = ("CANT PASS TRAIT TO Java?", ""), ret_conv_name = "NO CONV POSSIBLE")
 275                     if ty_info.rust_obj != "LDKu8slice":
 276                         # Don't bother free'ing slices passed in - Rust doesn't auto-free the
 277                         # underlying unlike Vecs, and it gives Java more freedom.
 278                         base_conv = base_conv + "\nFREE((void*)" + ty_info.var_name + ");";
 279                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 280                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv",
 281                         ret_conv = ("long " + ty_info.var_name + "_ref = (long)&", ";"), ret_conv_name = ty_info.var_name + "_ref")
 282                 else:
 283                     assert(not is_free)
 284                     if ty_info.rust_obj in opaque_structs:
 285                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 286                             arg_conv = opaque_arg_conv, arg_conv_name = "&" + ty_info.var_name + "_conv",
 287                             ret_conv = None, ret_conv_name = None) # its a pointer, no conv needed
 288                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 289                         arg_conv = ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)" + ty_info.var_name + ";",
 290                         arg_conv_name = ty_info.var_name + "_conv",
 291                         ret_conv = None, ret_conv_name = None) # its a pointer, no conv needed
 292             elif ty_info.is_ptr:
 293                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 294                     arg_conv = None, arg_conv_name = ty_info.var_name, ret_conv = None, ret_conv_name = None)
 295             elif ty_info.java_ty == "String":
 296                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 297                     arg_conv = None, arg_conv_name = None,
 298                     ret_conv = ("jstring " + ty_info.var_name + "_conv = (*_env)->NewStringUTF(_env, ", ");"), ret_conv_name = ty_info.var_name + "_conv")
 299             else:
 300                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 301                     arg_conv = None, arg_conv_name = ty_info.var_name, ret_conv = None, ret_conv_name = None)
 302         elif not print_void:
 303             # We don't have a parameter name, and want one, just call it arg
 304             if ty_info.rust_obj is not None:
 305                 assert(not is_free or ty_info.rust_obj not in opaque_structs);
 306                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 307                     arg_conv = ty_info.rust_obj + " arg_conv = *(" + ty_info.rust_obj + "*)arg;\nFREE((void*)arg);",
 308                     arg_conv_name = "arg_conv",
 309                     ret_conv = None, ret_conv_name = None)
 310             else:
 311                 assert(not is_free)
 312                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 313                     arg_conv = None, arg_conv_name = "arg", ret_conv = None, ret_conv_name = None)
 314         else:
 315             # We don't have a parameter name, and don't want one (cause we're returning)
 316             if ty_info.rust_obj is not None:
 317                 if not ty_info.is_ptr:
 318                     if ty_info.rust_obj in unitary_enums:
 319                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 320                             arg_conv = ty_info.rust_obj + " ret = " + ty_info.rust_obj + "_from_java(_env, " + ty_info.var_name + ");",
 321                             arg_conv_name = "ret",
 322                             ret_conv = ("jclass ret = " + ty_info.rust_obj + "_to_java(_env, ", ");"), ret_conv_name = "ret")
 323                     if ty_info.rust_obj in opaque_structs:
 324                         # If we're returning a newly-allocated struct, we don't want Rust to ever
 325                         # free, instead relying on the Java GC to lose the ref. We undo this in
 326                         # any _free function.
 327                         # To avoid any issues, we first assert that the incoming object is non-ref.
 328                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 329                             ret_conv = (ty_info.rust_obj + " ret = ", ";"),
 330                             ret_conv_name = "((long)ret.inner) | (ret.is_owned ? 1 : 0)",
 331                             arg_conv = None, arg_conv_name = None)
 332                     else:
 333                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 334                             ret_conv = (ty_info.rust_obj + "* ret = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n*ret = ", ";"),
 335                             ret_conv_name = "(long)ret",
 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 = ("long ret = (long)", ";"), ret_conv_name = "ret",
 340                         arg_conv = None, arg_conv_name = None)
 341             else:
 342                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 343                     arg_conv = None, arg_conv_name = None, ret_conv = None, ret_conv_name = None)
 344
 345     def map_fn(line, re_match, ret_arr_len, c_call_string):
 346         out_java.write("\t// " + line)
 347         out_java.write("\tpublic static native ")
 348         out_c.write("JNIEXPORT ")
 349
 350         is_free = re_match.group(2).endswith("_free")
 351         struct_meth = re_match.group(2).split("_")[0]
 352
 353         ret_info = map_type(re_match.group(1), True, ret_arr_len, False)
 354         ret_info.print_ty()
 355
 356         if ret_info.ret_conv is not None:
 357             ret_conv_pfx, ret_conv_sfx = ret_info.ret_conv
 358
 359         out_java.write(" " + re_match.group(2) + "(")
 360         out_c.write(" JNICALL Java_org_ldk_impl_bindings_" + re_match.group(2).replace('_', '_1') + "(JNIEnv * _env, jclass _b")
 361
 362         arg_names = []
 363         takes_self = False
 364         args_known = not ret_info.passed_as_ptr or ret_info.rust_obj in opaque_structs or ret_info.rust_obj in trait_structs
 365         for idx, arg in enumerate(re_match.group(3).split(',')):
 366             if idx != 0:
 367                 out_java.write(", ")
 368             if arg != "void":
 369                 out_c.write(", ")
 370             arg_conv_info = map_type(arg, False, None, is_free)
 371             if arg_conv_info.c_ty != "void":
 372                 arg_conv_info.print_ty()
 373                 arg_conv_info.print_name()
 374             if arg_conv_info.arg_name == "this_arg":
 375                 takes_self = True
 376             if arg_conv_info.passed_as_ptr and not arg_conv_info.rust_obj in opaque_structs:
 377                 if not arg_conv_info.rust_obj in trait_structs and not arg_conv_info.rust_obj in unitary_enums:
 378                     print(re_match.group(2) + " bad - " + arg_conv_info.rust_obj)
 379                     args_known = False
 380             arg_names.append(arg_conv_info)
 381
 382         out_java_struct = None
 383         if "LDK" + struct_meth in opaque_structs and not is_free:
 384             out_java_struct = open(sys.argv[3] + "/structs/" + struct_meth + ".java", "a")
 385             if not args_known:
 386                 out_java_struct.write("\t// Skipped " + re_match.group(2) + "\n")
 387                 out_java_struct.close()
 388                 out_java_struct = None
 389             else:
 390                 out_java_struct.write("\tpublic ")
 391                 meth_n = re_match.group(2)[len(struct_meth) + 1:]
 392                 if ret_info.rust_obj == "LDK" + struct_meth:
 393                     out_java_struct.write(struct_meth + "(")
 394                 elif ret_info.rust_obj in opaque_structs or ret_info.rust_obj in trait_structs:
 395                     out_java_struct.write(ret_info.rust_obj.replace("LDK", "") + " " + meth_n + "(")
 396                 else:
 397                     out_java_struct.write(ret_info.java_ty + " " + meth_n + "(")
 398                 for idx, arg in enumerate(arg_names):
 399                     if idx != 0:
 400                         if not takes_self or idx > 1:
 401                             out_java_struct.write(", ")
 402                     if arg.java_ty != "void" and arg.arg_name != "this_arg":
 403                         if arg.passed_as_ptr:
 404                             if arg.rust_obj in opaque_structs or arg.rust_obj in trait_structs:
 405                                 out_java_struct.write(arg.rust_obj.replace("LDK", "") + " " + arg.arg_name)
 406                             else:
 407                                 out_java_struct.write(arg.rust_obj + " " + arg.arg_name)
 408                         else:
 409                             out_java_struct.write(arg.java_ty + " " + arg.arg_name)
 410
 411
 412         out_java.write(");\n")
 413         out_c.write(") {\n")
 414         if out_java_struct is not None:
 415             out_java_struct.write(") {\n")
 416
 417         for info in arg_names:
 418             if info.arg_conv is not None:
 419                 out_c.write("\t" + info.arg_conv.replace('\n', "\n\t") + "\n");
 420
 421         if ret_info.ret_conv is not None:
 422             out_c.write("\t" + ret_conv_pfx.replace('\n', '\n\t'));
 423         else:
 424             out_c.write("\treturn ");
 425
 426         if c_call_string is None:
 427             out_c.write(re_match.group(2) + "(")
 428         else:
 429             out_c.write(c_call_string)
 430         for idx, info in enumerate(arg_names):
 431             if info.arg_conv_name is not None:
 432                 if idx != 0:
 433                     out_c.write(", ")
 434                 elif c_call_string is not None:
 435                     continue
 436                 out_c.write(info.arg_conv_name)
 437         out_c.write(")")
 438         if ret_info.ret_conv is not None:
 439             out_c.write(ret_conv_sfx.replace('\n', '\n\t'))
 440             out_c.write("\n\treturn " + ret_info.ret_conv_name + ";")
 441         else:
 442             out_c.write(";")
 443         out_c.write("\n}\n\n")
 444         if out_java_struct is not None:
 445             out_java_struct.write("\t\t")
 446             if ret_info.rust_obj == "LDK" + struct_meth:
 447                 out_java_struct.write("super(")
 448             elif ret_info.java_ty != "void" and not ret_info.passed_as_ptr:
 449                 out_java_struct.write(ret_info.java_ty + " ret = ")
 450             elif ret_info.java_ty != "void":
 451                 out_java_struct.write(ret_info.rust_obj.replace("LDK", "") + " ret = ")
 452                 if ret_info.rust_obj in opaque_structs or ret_info.rust_obj in trait_structs:
 453                     out_java_struct.write("new " + ret_info.rust_obj.replace("LDK", "") + "(null, ")
 454             out_java_struct.write("bindings." + re_match.group(2) + "(")
 455             for idx, info in enumerate(arg_names):
 456                 if idx != 0:
 457                     out_java_struct.write(", ")
 458                 if info.arg_name == "this_arg":
 459                     out_java_struct.write("this.ptr")
 460                 elif info.passed_as_ptr and info.rust_obj in opaque_structs:
 461                     out_java_struct.write(info.arg_name + ".ptr & ~1")
 462                 elif info.passed_as_ptr and info.rust_obj in trait_structs:
 463                     out_java_struct.write(info.arg_name + ".ptr")
 464                 else:
 465                     out_java_struct.write(info.arg_name)
 466             out_java_struct.write(")")
 467             if ret_info.rust_obj == "LDK" + struct_meth:
 468                 out_java_struct.write(");\n")
 469             elif ret_info.rust_obj in opaque_structs:
 470                 out_java_struct.write(");\n")
 471             elif ret_info.rust_obj in trait_structs:
 472                 out_java_struct.write(");\n\t\tret.ptrs_to.add(this);\n")
 473             else:
 474                 out_java_struct.write(";\n")
 475
 476             for info in arg_names:
 477                 if info.arg_name == "this_arg":
 478                     pass
 479                 elif info.passed_as_ptr and (info.rust_obj in opaque_structs or info.rust_obj in trait_structs):
 480                     out_java_struct.write("\t\tthis.ptrs_to.add(" + info.arg_name + ");\n")
 481
 482             if ret_info.java_ty != "void" and ret_info.rust_obj != "LDK" + struct_meth:
 483                 out_java_struct.write("\t\treturn ret;\n")
 484             out_java_struct.write("\t}\n\n")
 485             out_java_struct.close()
 486
 487     def map_unitary_enum(struct_name, field_lines):
 488         with open(sys.argv[3] + "/enums/" + struct_name + ".java", "w") as out_java_enum:
 489             out_java_enum.write("package org.ldk.enums;\n\n")
 490             unitary_enums.add(struct_name)
 491             out_c.write("static inline " + struct_name + " " + struct_name + "_from_java(JNIEnv *env, jclass val) {\n")
 492             out_c.write("\tswitch ((*env)->CallIntMethod(env, val, ordinal_meth)) {\n")
 493             ord_v = 0
 494             for idx, struct_line in enumerate(field_lines):
 495                 if idx == 0:
 496                     out_java_enum.write("public enum " + struct_name + " {\n")
 497                 elif idx == len(field_lines) - 3:
 498                     assert(struct_line.endswith("_Sentinel,"))
 499                 elif idx == len(field_lines) - 2:
 500                     out_java_enum.write("\t; static native void init();\n")
 501                     out_java_enum.write("\tstatic { init(); }\n")
 502                     out_java_enum.write("}")
 503                     out_java.write("\tstatic { " + struct_name + ".values(); /* Force enum statics to run */ }\n")
 504                 elif idx == len(field_lines) - 1:
 505                     assert(struct_line == "")
 506                 else:
 507                     out_java_enum.write(struct_line + "\n")
 508                     out_c.write("\t\tcase %d: return %s;\n" % (ord_v, struct_line.strip().strip(",")))
 509                     ord_v = ord_v + 1
 510             out_c.write("\t}\n")
 511             out_c.write("\tabort();\n")
 512             out_c.write("}\n")
 513
 514             ord_v = 0
 515             out_c.write("static jclass " + struct_name + "_class = NULL;\n")
 516             for idx, struct_line in enumerate(field_lines):
 517                 if idx > 0 and idx < len(field_lines) - 3:
 518                     variant = struct_line.strip().strip(",")
 519                     out_c.write("static jfieldID " + struct_name + "_" + variant + " = NULL;\n")
 520             out_c.write("JNIEXPORT void JNICALL Java_org_ldk_enums_" + struct_name.replace("_", "_1") + "_init (JNIEnv * env, jclass clz) {\n")
 521             out_c.write("\t" + struct_name + "_class = (*env)->NewGlobalRef(env, clz);\n")
 522             out_c.write("\tDO_ASSERT(" + struct_name + "_class != NULL);\n")
 523             for idx, struct_line in enumerate(field_lines):
 524                 if idx > 0 and idx < len(field_lines) - 3:
 525                     variant = struct_line.strip().strip(",")
 526                     out_c.write("\t" + struct_name + "_" + variant + " = (*env)->GetStaticFieldID(env, " + struct_name + "_class, \"" + variant + "\", \"Lorg/ldk/enums/" + struct_name + ";\");\n")
 527                     out_c.write("\tDO_ASSERT(" + struct_name + "_" + variant + " != NULL);\n")
 528             out_c.write("}\n")
 529             out_c.write("static inline jclass " + struct_name + "_to_java(JNIEnv *env, " + struct_name + " val) {\n")
 530             out_c.write("\tswitch (val) {\n")
 531             for idx, struct_line in enumerate(field_lines):
 532                 if idx > 0 and idx < len(field_lines) - 3:
 533                     variant = struct_line.strip().strip(",")
 534                     out_c.write("\t\tcase " + variant + ":\n")
 535                     out_c.write("\t\t\treturn (*env)->GetStaticObjectField(env, " + struct_name + "_class, " + struct_name + "_" + variant + ");\n")
 536                     ord_v = ord_v + 1
 537             out_c.write("\t\tdefault: abort();\n")
 538             out_c.write("\t}\n")
 539             out_c.write("}\n\n")
 540
 541     def map_complex_enum(struct_name, union_enum_items):
 542         tag_field_lines = union_enum_items["field_lines"]
 543         init_meth_jty_strs = {}
 544         for idx, struct_line in enumerate(tag_field_lines):
 545             if idx == 0:
 546                 out_java.write("\tpublic static class " + struct_name + " {\n")
 547                 out_java.write("\t\tprivate " + struct_name + "() {}\n")
 548             elif idx == len(tag_field_lines) - 3:
 549                 assert(struct_line.endswith("_Sentinel,"))
 550             elif idx == len(tag_field_lines) - 2:
 551                 out_java.write("\t\tstatic native void init();\n")
 552                 out_java.write("\t}\n")
 553             elif idx == len(tag_field_lines) - 1:
 554                 assert(struct_line == "")
 555             else:
 556                 var_name = struct_line.strip(' ,')[len(struct_name) + 1:]
 557                 out_java.write("\t\tpublic final static class " + var_name + " extends " + struct_name + " {\n")
 558                 out_c.write("static jclass " + struct_name + "_" + var_name + "_class = NULL;\n")
 559                 out_c.write("static jmethodID " + struct_name + "_" + var_name + "_meth = NULL;\n")
 560                 init_meth_jty_str = ""
 561                 init_meth_params = ""
 562                 init_meth_body = ""
 563                 if "LDK" + var_name in union_enum_items:
 564                     enum_var_lines = union_enum_items["LDK" + var_name]
 565                     for idx, field in enumerate(enum_var_lines):
 566                         if idx != 0 and idx < len(enum_var_lines) - 2:
 567                             field_ty = java_c_types(field.strip(' ;'), None)
 568                             out_java.write("\t\t\tpublic " + field_ty.java_ty + " " + field_ty.var_name + ";\n")
 569                             init_meth_jty_str = init_meth_jty_str + field_ty.java_fn_ty_arg
 570                             if idx > 1:
 571                                 init_meth_params = init_meth_params + ", "
 572                             init_meth_params = init_meth_params + field_ty.java_ty + " " + field_ty.var_name
 573                             init_meth_body = init_meth_body + "this." + field_ty.var_name + " = " + field_ty.var_name + "; "
 574                     out_java.write("\t\t\t" + var_name + "(" + init_meth_params + ") { ")
 575                     out_java.write(init_meth_body)
 576                     out_java.write("}\n")
 577                 out_java.write("\t\t}\n")
 578                 init_meth_jty_strs[var_name] = init_meth_jty_str
 579         out_java.write("\tstatic { " + struct_name + ".init(); }\n")
 580         out_java.write("\tpublic static native " + struct_name + " " + struct_name + "_ref_from_ptr(long ptr);\n");
 581
 582         out_c.write("JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_00024" + struct_name.replace("_", "_1") + "_init (JNIEnv * env, jclass _a) {\n")
 583         for idx, struct_line in enumerate(tag_field_lines):
 584             if idx != 0 and idx < len(tag_field_lines) - 3:
 585                 var_name = struct_line.strip(' ,')[len(struct_name) + 1:]
 586                 out_c.write("\t" + struct_name + "_" + var_name + "_class =\n")
 587                 out_c.write("\t\t(*env)->NewGlobalRef(env, (*env)->FindClass(env, \"Lorg/ldk/impl/bindings$" + struct_name + "$" + var_name + ";\"));\n")
 588                 out_c.write("\tDO_ASSERT(" + struct_name + "_" + var_name + "_class != NULL);\n")
 589                 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")
 590                 out_c.write("\tDO_ASSERT(" + struct_name + "_" + var_name + "_meth != NULL);\n")
 591         out_c.write("}\n")
 592         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")
 593         out_c.write("\t" + struct_name + " *obj = (" + struct_name + "*)ptr;\n")
 594         out_c.write("\tswitch(obj->tag) {\n")
 595         for idx, struct_line in enumerate(tag_field_lines):
 596             if idx != 0 and idx < len(tag_field_lines) - 3:
 597                 var_name = struct_line.strip(' ,')[len(struct_name) + 1:]
 598                 out_c.write("\t\tcase " + struct_name + "_" + var_name + ": {\n")
 599                 c_params_text = ""
 600                 if "LDK" + var_name in union_enum_items:
 601                     enum_var_lines = union_enum_items["LDK" + var_name]
 602                     for idx, field in enumerate(enum_var_lines):
 603                         if idx != 0 and idx < len(enum_var_lines) - 2:
 604                             field_map = map_type(field.strip(' ;'), False, None, False)
 605                             if field_map.ret_conv is not None:
 606                                 out_c.write("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t").replace("_env", "env"))
 607                                 out_c.write("obj->" + camel_to_snake(var_name) + "." + field_map.arg_name)
 608                                 out_c.write(field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
 609                                 c_params_text = c_params_text + ", " + field_map.ret_conv_name
 610                             else:
 611                                 c_params_text = c_params_text + ", obj->" + camel_to_snake(var_name) + "." + field_map.arg_name
 612                 out_c.write("\t\t\treturn (*env)->NewObject(env, " + struct_name + "_" + var_name + "_class, " + struct_name + "_" + var_name + "_meth" + c_params_text + ");\n")
 613                 out_c.write("\t\t}\n")
 614         out_c.write("\t\tdefault: abort();\n")
 615         out_c.write("\t}\n}\n")
 616
 617     def map_trait(struct_name, field_var_lines, trait_fn_lines):
 618         with open(sys.argv[3] + "/structs/" + struct_name.replace("LDK","") + ".java", "w") as out_java_trait:
 619             out_c.write("typedef struct " + struct_name + "_JCalls {\n")
 620             out_c.write("\tatomic_size_t refcnt;\n")
 621             out_c.write("\tJavaVM *vm;\n")
 622             out_c.write("\tjweak o;\n")
 623             for var_line in field_var_lines:
 624                 if var_line.group(1) in trait_structs:
 625                     out_c.write("\t" + var_line.group(1) + "_JCalls* " + var_line.group(2) + ";\n")
 626             for fn_line in trait_fn_lines:
 627                 if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
 628                     out_c.write("\tjmethodID " + fn_line.group(2) + "_meth;\n")
 629             out_c.write("} " + struct_name + "_JCalls;\n")
 630
 631             out_java_trait.write("package org.ldk.structs;\n\n")
 632             out_java_trait.write("import org.ldk.impl.bindings;\n\n")
 633             out_java_trait.write("public class " + struct_name.replace("LDK","") + " extends CommonBase {\n")
 634             out_java_trait.write("\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); }\n")
 635             out_java_trait.write("\tpublic " + struct_name.replace("LDK", "") + "(bindings." + struct_name + " arg")
 636             for var_line in field_var_lines:
 637                 if var_line.group(1) in trait_structs:
 638                     out_java_trait.write(", bindings." + var_line.group(1) + " " + var_line.group(2))
 639             out_java_trait.write(") {\n")
 640             out_java_trait.write("\t\tsuper(bindings." + struct_name + "_new(arg")
 641             for var_line in field_var_lines:
 642                 if var_line.group(1) in trait_structs:
 643                     out_java_trait.write(", " + var_line.group(2))
 644             out_java_trait.write("));\n")
 645             out_java_trait.write("\t\tthis.ptrs_to.add(arg);\n")
 646             out_java_trait.write("\t}\n")
 647             out_java_trait.write("\t@Override @SuppressWarnings(\"deprecation\")\n")
 648             out_java_trait.write("\tprotected void finalize() throws Throwable {\n")
 649             out_java_trait.write("\t\tbindings." + struct_name.replace("LDK","") + "_free(ptr); super.finalize();\n")
 650             out_java_trait.write("\t}\n\n")
 651             out_java_trait.write("}\n")
 652
 653             out_java.write("\tpublic interface " + struct_name + " {\n")
 654             java_meths = []
 655             for fn_line in trait_fn_lines:
 656                 java_meth_descr = "("
 657                 if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
 658                     ret_ty_info = java_c_types(fn_line.group(1), None)
 659
 660                     out_java.write("\t\t " + ret_ty_info.java_ty + " " + fn_line.group(2) + "(")
 661                     is_const = fn_line.group(3) is not None
 662                     out_c.write(fn_line.group(1) + fn_line.group(2) + "_jcall(")
 663                     if is_const:
 664                         out_c.write("const void* this_arg")
 665                     else:
 666                         out_c.write("void* this_arg")
 667
 668                     arg_names = []
 669                     for idx, arg in enumerate(fn_line.group(4).split(',')):
 670                         if arg == "":
 671                             continue
 672                         if idx >= 2:
 673                             out_java.write(", ")
 674                         out_c.write(", ")
 675                         arg_conv_info = map_type(arg, True, None, False)
 676                         out_c.write(arg.strip())
 677                         out_java.write(arg_conv_info.java_ty + " " + arg_conv_info.arg_name)
 678                         arg_names.append(arg_conv_info)
 679                         java_meth_descr = java_meth_descr + arg_conv_info.java_fn_ty_arg
 680                     java_meth_descr = java_meth_descr + ")" + ret_ty_info.java_fn_ty_arg
 681                     java_meths.append(java_meth_descr)
 682
 683                     out_java.write(");\n")
 684                     out_c.write(") {\n")
 685                     out_c.write("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
 686                     out_c.write("\tJNIEnv *env;\n")
 687                     out_c.write("\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_8) == JNI_OK);\n")
 688
 689                     for arg_info in arg_names:
 690                         if arg_info.ret_conv is not None:
 691                             out_c.write("\t" + arg_info.ret_conv[0].replace('\n', '\n\t').replace("_env", "env"));
 692                             out_c.write(arg_info.arg_name)
 693                             out_c.write(arg_info.ret_conv[1].replace('\n', '\n\t').replace("_env", "env") + "\n")
 694
 695                     out_c.write("\tjobject obj = (*env)->NewLocalRef(env, j_calls->o);\n\tDO_ASSERT(obj != NULL);\n")
 696                     if ret_ty_info.c_ty.endswith("Array"):
 697                         assert(ret_ty_info.c_ty == "jbyteArray")
 698                         out_c.write("\tjbyteArray jret = (*env)->CallObjectMethod(env, obj, j_calls->" + fn_line.group(2) + "_meth")
 699                     elif not ret_ty_info.passed_as_ptr:
 700                         out_c.write("\treturn (*env)->Call" + ret_ty_info.java_ty.title() + "Method(env, obj, j_calls->" + fn_line.group(2) + "_meth")
 701                     else:
 702                         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");
 703
 704                     for arg_info in arg_names:
 705                         if arg_info.ret_conv is not None:
 706                             out_c.write(", " + arg_info.ret_conv_name)
 707                         else:
 708                             out_c.write(", " + arg_info.arg_name)
 709                     out_c.write(");\n");
 710                     if ret_ty_info.c_ty.endswith("Array"):
 711                         out_c.write("\t" + ret_ty_info.rust_obj + " ret;\n")
 712                         out_c.write("\t(*env)->GetByteArrayRegion(env, jret, 0, " + ret_ty_info.arr_len + ", ret." + ret_ty_info.arr_access + ");\n")
 713                         out_c.write("\treturn ret;\n")
 714
 715                     if ret_ty_info.passed_as_ptr:
 716                         out_c.write("\t" + fn_line.group(1).strip() + " res = *ret;\n")
 717                         out_c.write("\tFREE(ret);\n")
 718                         out_c.write("\treturn res;\n")
 719                     out_c.write("}\n")
 720                 elif fn_line.group(2) == "free":
 721                     out_c.write("static void " + struct_name + "_JCalls_free(void* this_arg) {\n")
 722                     out_c.write("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
 723                     out_c.write("\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n")
 724                     out_c.write("\t\tJNIEnv *env;\n")
 725                     out_c.write("\t\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_8) == JNI_OK);\n")
 726                     out_c.write("\t\t(*env)->DeleteWeakGlobalRef(env, j_calls->o);\n")
 727                     out_c.write("\t\tFREE(j_calls);\n")
 728                     out_c.write("\t}\n}\n")
 729
 730             # Write out a clone function whether we need one or not, as we use them in moving to rust
 731             out_c.write("static void* " + struct_name + "_JCalls_clone(const void* this_arg) {\n")
 732             out_c.write("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
 733             out_c.write("\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n")
 734             for var_line in field_var_lines:
 735                 if var_line.group(1) in trait_structs:
 736                     out_c.write("\tatomic_fetch_add_explicit(&j_calls->" + var_line.group(2) + "->refcnt, 1, memory_order_release);\n")
 737             out_c.write("\treturn (void*) this_arg;\n")
 738             out_c.write("}\n")
 739
 740             out_java.write("\t}\n")
 741
 742             out_java.write("\tpublic static native long " + struct_name + "_new(" + struct_name + " impl")
 743             out_c.write("static inline " + struct_name + " " + struct_name + "_init (JNIEnv * env, jclass _a, jobject o")
 744             for var_line in field_var_lines:
 745                 if var_line.group(1) in trait_structs:
 746                     out_java.write(", " + var_line.group(1) + " " + var_line.group(2))
 747                     out_c.write(", jobject " + var_line.group(2))
 748             out_java.write(");\n")
 749             out_c.write(") {\n")
 750
 751             out_c.write("\tjclass c = (*env)->GetObjectClass(env, o);\n")
 752             out_c.write("\tDO_ASSERT(c != NULL);\n")
 753             out_c.write("\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n")
 754             out_c.write("\tatomic_init(&calls->refcnt, 1);\n")
 755             out_c.write("\tDO_ASSERT((*env)->GetJavaVM(env, &calls->vm) == 0);\n")
 756             out_c.write("\tcalls->o = (*env)->NewWeakGlobalRef(env, o);\n")
 757             for (fn_line, java_meth_descr) in zip(trait_fn_lines, java_meths):
 758                 if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
 759                     out_c.write("\tcalls->" + fn_line.group(2) + "_meth = (*env)->GetMethodID(env, c, \"" + fn_line.group(2) + "\", \"" + java_meth_descr + "\");\n")
 760                     out_c.write("\tDO_ASSERT(calls->" + fn_line.group(2) + "_meth != NULL);\n")
 761             out_c.write("\n\t" + struct_name + " ret = {\n")
 762             out_c.write("\t\t.this_arg = (void*) calls,\n")
 763             for fn_line in trait_fn_lines:
 764                 if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
 765                     out_c.write("\t\t." + fn_line.group(2) + " = " + fn_line.group(2) + "_jcall,\n")
 766                 elif fn_line.group(2) == "free":
 767                     out_c.write("\t\t.free = " + struct_name + "_JCalls_free,\n")
 768                 else:
 769                     out_c.write("\t\t.clone = " + struct_name + "_JCalls_clone,\n")
 770             for var_line in field_var_lines:
 771                 if var_line.group(1) in trait_structs:
 772                     out_c.write("\t\t." + var_line.group(2) + " = " + var_line.group(1) + "_init(env, _a, " + var_line.group(2) + "),\n")
 773             out_c.write("\t};\n")
 774             for var_line in field_var_lines:
 775                 if var_line.group(1) in trait_structs:
 776                     out_c.write("\tcalls->" + var_line.group(2) + " = ret." + var_line.group(2) + ".this_arg;\n")
 777             out_c.write("\treturn ret;\n")
 778             out_c.write("}\n")
 779
 780             out_c.write("JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1new (JNIEnv * env, jclass _a, jobject o")
 781             for var_line in field_var_lines:
 782                 if var_line.group(1) in trait_structs:
 783                     out_c.write(", jobject " + var_line.group(2))
 784             out_c.write(") {\n")
 785             out_c.write("\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n")
 786             out_c.write("\t*res_ptr = " + struct_name + "_init(env, _a, o")
 787             for var_line in field_var_lines:
 788                 if var_line.group(1) in trait_structs:
 789                     out_c.write(", " + var_line.group(2))
 790             out_c.write(");\n")
 791             out_c.write("\treturn (long)res_ptr;\n")
 792             out_c.write("}\n")
 793
 794             out_java.write("\tpublic static native " + struct_name + " " + struct_name + "_get_obj_from_jcalls(long val);\n")
 795             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")
 796             out_c.write("\tjobject ret = (*env)->NewLocalRef(env, ((" + struct_name + "_JCalls*)val)->o);\n")
 797             out_c.write("\tDO_ASSERT(ret != NULL);\n")
 798             out_c.write("\treturn ret;\n")
 799             out_c.write("}\n")
 800
 801             for fn_line in trait_fn_lines:
 802                 # For now, just disable enabling the _call_log - we don't know how to inverse-map String
 803                 is_log = fn_line.group(2) == "log" and struct_name == "LDKLogger"
 804                 if fn_line.group(2) != "free" and fn_line.group(2) != "clone" and fn_line.group(2) != "eq" and not is_log:
 805                     dummy_line = fn_line.group(1) + struct_name + "_call_" + fn_line.group(2) + " " + struct_name + "* arg" + fn_line.group(4) + "\n"
 806                     map_fn(dummy_line, re.compile("([A-Za-z_0-9]*) *([A-Za-z_0-9]*) *(.*)").match(dummy_line), None, "(arg_conv->" + fn_line.group(2) + ")(arg_conv->this_arg")
 807
 808     out_c.write("""#include \"org_ldk_impl_bindings.h\"
 809 #include <rust_types.h>
 810 #include <lightning.h>
 811 #include <string.h>
 812 #include <stdatomic.h>
 813 """)
 814
 815     if sys.argv[4] == "false":
 816         out_c.write("#define MALLOC(a, _) malloc(a)\n")
 817         out_c.write("#define FREE free\n")
 818         out_c.write("#define DO_ASSERT(a) (void)(a)\n")
 819     else:
 820         out_c.write("""#include <assert.h>
 821 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
 822
 823 // Running a leak check across all the allocations and frees of the JDK is a mess,
 824 // so instead we implement our own naive leak checker here, relying on the -wrap
 825 // linker option to wrap malloc/calloc/realloc/free, tracking everyhing allocated
 826 // and free'd in Rust or C across the generated bindings shared library.
 827 #include <threads.h>
 828 #include <execinfo.h>
 829 #include <unistd.h>
 830 static mtx_t allocation_mtx;
 831
 832 void __attribute__((constructor)) init_mtx() {
 833         DO_ASSERT(mtx_init(&allocation_mtx, mtx_plain) == thrd_success);
 834 }
 835
 836 #define BT_MAX 128
 837 typedef struct allocation {
 838         struct allocation* next;
 839         void* ptr;
 840         const char* struct_name;
 841         void* bt[BT_MAX];
 842         int bt_len;
 843 } allocation;
 844 static allocation* allocation_ll = NULL;
 845
 846 void* __real_malloc(size_t len);
 847 void* __real_calloc(size_t nmemb, size_t len);
 848 static void new_allocation(void* res, const char* struct_name) {
 849         allocation* new_alloc = __real_malloc(sizeof(allocation));
 850         new_alloc->ptr = res;
 851         new_alloc->struct_name = struct_name;
 852         new_alloc->bt_len = backtrace(new_alloc->bt, BT_MAX);
 853         DO_ASSERT(mtx_lock(&allocation_mtx) == thrd_success);
 854         new_alloc->next = allocation_ll;
 855         allocation_ll = new_alloc;
 856         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
 857 }
 858 static void* MALLOC(size_t len, const char* struct_name) {
 859         void* res = __real_malloc(len);
 860         new_allocation(res, struct_name);
 861         return res;
 862 }
 863 void __real_free(void* ptr);
 864 static void alloc_freed(void* ptr) {
 865         allocation* p = NULL;
 866         DO_ASSERT(mtx_lock(&allocation_mtx) == thrd_success);
 867         allocation* it = allocation_ll;
 868         while (it->ptr != ptr) { p = it; it = it->next; }
 869         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
 870         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
 871         DO_ASSERT(it->ptr == ptr);
 872         __real_free(it);
 873 }
 874 static void FREE(void* ptr) {
 875         alloc_freed(ptr);
 876         __real_free(ptr);
 877 }
 878
 879 void* __wrap_malloc(size_t len) {
 880         void* res = __real_malloc(len);
 881         new_allocation(res, "malloc call");
 882         return res;
 883 }
 884 void* __wrap_calloc(size_t nmemb, size_t len) {
 885         void* res = __real_calloc(nmemb, len);
 886         new_allocation(res, "calloc call");
 887         return res;
 888 }
 889 void __wrap_free(void* ptr) {
 890         alloc_freed(ptr);
 891         __real_free(ptr);
 892 }
 893
 894 void* __real_realloc(void* ptr, size_t newlen);
 895 void* __wrap_realloc(void* ptr, size_t len) {
 896         alloc_freed(ptr);
 897         void* res = __real_realloc(ptr, len);
 898         new_allocation(res, "realloc call");
 899         return res;
 900 }
 901 void __wrap_reallocarray(void* ptr, size_t new_sz) {
 902         // Rust doesn't seem to use reallocarray currently
 903         assert(false);
 904 }
 905
 906 void __attribute__((destructor)) check_leaks() {
 907         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 908                 fprintf(stderr, "%s %p remains:\\n", a->struct_name, a->ptr);
 909                 backtrace_symbols_fd(a->bt, a->bt_len, STDERR_FILENO);
 910                 fprintf(stderr, "\\n\\n");
 911         }
 912         DO_ASSERT(allocation_ll == NULL);
 913 }
 914 """)
 915     out_java.write("""package org.ldk.impl;
 916 import org.ldk.enums.*;
 917
 918 public class bindings {
 919         public static class VecOrSliceDef {
 920                 public long dataptr;
 921                 public long datalen;
 922                 public long stride;
 923                 public VecOrSliceDef(long dataptr, long datalen, long stride) {
 924                         this.dataptr = dataptr; this.datalen = datalen; this.stride = stride;
 925                 }
 926         }
 927         static {
 928                 System.loadLibrary(\"lightningjni\");
 929                 init(java.lang.Enum.class, VecOrSliceDef.class);
 930         }
 931         static native void init(java.lang.Class c, java.lang.Class slicedef);
 932
 933         public static native boolean deref_bool(long ptr);
 934         public static native long deref_long(long ptr);
 935         public static native void free_heap_ptr(long ptr);
 936         public static native byte[] read_bytes(long ptr, long len);
 937         public static native byte[] get_u8_slice_bytes(long slice_ptr);
 938         public static native long bytes_to_u8_vec(byte[] bytes);
 939         public static native long new_txpointer_copy_data(byte[] txdata);
 940         public static native long vec_slice_len(long vec);
 941         public static native long new_empty_slice_vec();
 942
 943 """)
 944     out_c.write("""
 945 static jmethodID ordinal_meth = NULL;
 946 static jmethodID slicedef_meth = NULL;
 947 static jclass slicedef_cls = NULL;
 948 JNIEXPORT void Java_org_ldk_impl_bindings_init(JNIEnv * env, jclass _b, jclass enum_class, jclass slicedef_class) {
 949         ordinal_meth = (*env)->GetMethodID(env, enum_class, "ordinal", "()I");
 950         DO_ASSERT(ordinal_meth != NULL);
 951         slicedef_meth = (*env)->GetMethodID(env, slicedef_class, "<init>", "(JJJ)V");
 952         DO_ASSERT(slicedef_meth != NULL);
 953         slicedef_cls = (*env)->NewGlobalRef(env, slicedef_class);
 954         DO_ASSERT(slicedef_cls != NULL);
 955 }
 956
 957 JNIEXPORT jboolean JNICALL Java_org_ldk_impl_bindings_deref_1bool (JNIEnv * env, jclass _a, jlong ptr) {
 958         return *((bool*)ptr);
 959 }
 960 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_deref_1long (JNIEnv * env, jclass _a, jlong ptr) {
 961         return *((long*)ptr);
 962 }
 963 JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_free_1heap_1ptr (JNIEnv * env, jclass _a, jlong ptr) {
 964         FREE((void*)ptr);
 965 }
 966 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_read_1bytes (JNIEnv * _env, jclass _b, jlong ptr, jlong len) {
 967         jbyteArray ret_arr = (*_env)->NewByteArray(_env, len);
 968         (*_env)->SetByteArrayRegion(_env, ret_arr, 0, len, (unsigned char*)ptr);
 969         return ret_arr;
 970 }
 971 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_get_1u8_1slice_1bytes (JNIEnv * _env, jclass _b, jlong slice_ptr) {
 972         LDKu8slice *slice = (LDKu8slice*)slice_ptr;
 973         jbyteArray ret_arr = (*_env)->NewByteArray(_env, slice->datalen);
 974         (*_env)->SetByteArrayRegion(_env, ret_arr, 0, slice->datalen, slice->data);
 975         return ret_arr;
 976 }
 977 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_bytes_1to_1u8_1vec (JNIEnv * _env, jclass _b, jbyteArray bytes) {
 978         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "LDKCVec_u8");
 979         vec->datalen = (*_env)->GetArrayLength(_env, bytes);
 980         vec->data = (uint8_t*)MALLOC(vec->datalen, "LDKCVec_u8Z Bytes");
 981         (*_env)->GetByteArrayRegion (_env, bytes, 0, vec->datalen, vec->data);
 982         return (long)vec;
 983 }
 984 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_new_1txpointer_1copy_1data (JNIEnv * env, jclass _b, jbyteArray bytes) {
 985         LDKTransaction *txdata = (LDKTransaction*)MALLOC(sizeof(LDKTransaction), "LDKTransaction");
 986         txdata->datalen = (*env)->GetArrayLength(env, bytes);
 987         txdata->data = (uint8_t*)MALLOC(txdata->datalen, "Tx Data Bytes");
 988         txdata->data_is_owned = true;
 989         (*env)->GetByteArrayRegion (env, bytes, 0, txdata->datalen, txdata->data);
 990         return (long)txdata;
 991 }
 992 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_vec_1slice_1len (JNIEnv * env, jclass _a, jlong ptr) {
 993         // Check offsets of a few Vec types are all consistent as we're meant to be generic across types
 994         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_SignatureZ, datalen), "Vec<*> needs to be mapped identically");
 995         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_MessageSendEventZ, datalen), "Vec<*> needs to be mapped identically");
 996         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_EventZ, datalen), "Vec<*> needs to be mapped identically");
 997         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_C2Tuple_usizeTransactionZZ, datalen), "Vec<*> needs to be mapped identically");
 998         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)ptr;
 999         return (long)vec->datalen;
1000 }
1001 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_new_1empty_1slice_1vec (JNIEnv * _env, jclass _b) {
1002         // Check sizes of a few Vec types are all consistent as we're meant to be generic across types
1003         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_SignatureZ), "Vec<*> needs to be mapped identically");
1004         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_MessageSendEventZ), "Vec<*> needs to be mapped identically");
1005         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_EventZ), "Vec<*> needs to be mapped identically");
1006         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_C2Tuple_usizeTransactionZZ), "Vec<*> needs to be mapped identically");
1007         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "Empty LDKCVec");
1008         vec->data = NULL;
1009         vec->datalen = 0;
1010         return (long)vec;
1011 }
1012
1013 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
1014 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
1015 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
1016 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
1017
1018 """)
1019
1020     with open(sys.argv[3] + "/structs/CommonBase.java", "a") as out_java_struct:
1021         out_java_struct.write("""package org.ldk.structs;
1022 import java.util.LinkedList;
1023 class CommonBase {
1024         final long ptr;
1025         LinkedList<Object> ptrs_to = new LinkedList();
1026         protected CommonBase(long ptr) { this.ptr = ptr; }
1027         public long _test_only_get_ptr() { return this.ptr; }
1028 }
1029 """)
1030
1031     # XXX: Temporarily write out a manual SecretKey_new() for testing, we should auto-gen this kind of thing
1032     out_java.write("\tpublic static native long LDKSecretKey_new();\n\n") # TODO: rm me
1033     out_c.write("JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_LDKSecretKey_1new(JNIEnv * _env, jclass _b) {\n") # TODO: rm me
1034     out_c.write("\tLDKSecretKey* key = (LDKSecretKey*)MALLOC(sizeof(LDKSecretKey), \"LDKSecretKey\");\n") # TODO: rm me
1035     out_c.write("\treturn (long)key;\n") # TODO: rm me
1036     out_c.write("}\n") # TODO: rm me
1037
1038     in_block_comment = False
1039     cur_block_obj = None
1040
1041     const_val_regex = re.compile("^extern const ([A-Za-z_0-9]*) ([A-Za-z_0-9]*);$")
1042
1043     line_indicates_result_regex = re.compile("^   (LDKCResultPtr_[A-Za-z_0-9]*) contents;$")
1044     line_indicates_vec_regex = re.compile("^   ([A-Za-z_0-9]*) \*data;$")
1045     line_indicates_opaque_regex = re.compile("^   bool is_owned;$")
1046     line_indicates_trait_regex = re.compile("^   ([A-Za-z_0-9]* \*?)\(\*([A-Za-z_0-9]*)\)\((const )?void \*this_arg(.*)\);$")
1047     assert(line_indicates_trait_regex.match("   uintptr_t (*send_data)(void *this_arg, LDKu8slice data, bool resume_read);"))
1048     assert(line_indicates_trait_regex.match("   LDKCVec_MessageSendEventZ (*get_and_clear_pending_msg_events)(const void *this_arg);"))
1049     assert(line_indicates_trait_regex.match("   void *(*clone)(const void *this_arg);"))
1050     line_field_var_regex = re.compile("^   ([A-Za-z_0-9]*) ([A-Za-z_0-9]*);$")
1051     assert(line_field_var_regex.match("   LDKMessageSendEventsProvider MessageSendEventsProvider;"))
1052     struct_name_regex = re.compile("^typedef (struct|enum|union) (MUST_USE_STRUCT )?(LDK[A-Za-z_0-9]*) {$")
1053     assert(struct_name_regex.match("typedef struct LDKCVecTempl_u8 {"))
1054     assert(struct_name_regex.match("typedef enum LDKNetwork {"))
1055     struct_alias_regex = re.compile("^typedef (LDK[A-Za-z_0-9]*) (LDK[A-Za-z_0-9]*);$")
1056     assert(struct_alias_regex.match("typedef LDKCResultTempl_bool__PeerHandleError LDKCResult_boolPeerHandleErrorZ;"))
1057
1058     result_templ_structs = set()
1059     union_enum_items = {}
1060     result_ptr_struct_items = {}
1061     for line in in_h:
1062         if in_block_comment:
1063             if line.endswith("*/\n"):
1064                 in_block_comment = False
1065         elif cur_block_obj is not None:
1066             cur_block_obj  = cur_block_obj + line
1067             if line.startswith("} "):
1068                 field_lines = []
1069                 struct_name = None
1070                 vec_ty = None
1071                 obj_lines = cur_block_obj.split("\n")
1072                 is_opaque = False
1073                 result_contents = None
1074                 is_unitary_enum = False
1075                 is_union_enum = False
1076                 is_union = False
1077                 is_tuple = False
1078                 trait_fn_lines = []
1079                 field_var_lines = []
1080
1081                 for idx, struct_line in enumerate(obj_lines):
1082                     if struct_line.strip().startswith("/*"):
1083                         in_block_comment = True
1084                     if in_block_comment:
1085                         if struct_line.endswith("*/"):
1086                             in_block_comment = False
1087                     else:
1088                         struct_name_match = struct_name_regex.match(struct_line)
1089                         if struct_name_match is not None:
1090                             struct_name = struct_name_match.group(3)
1091                             if struct_name_match.group(1) == "enum":
1092                                 if not struct_name.endswith("_Tag"):
1093                                     is_unitary_enum = True
1094                                 else:
1095                                     is_union_enum = True
1096                             elif struct_name_match.group(1) == "union":
1097                                 is_union = True
1098                         if line_indicates_opaque_regex.match(struct_line):
1099                             is_opaque = True
1100                         result_match = line_indicates_result_regex.match(struct_line)
1101                         if result_match is not None:
1102                             result_contents = result_match.group(1)
1103                         vec_ty_match = line_indicates_vec_regex.match(struct_line)
1104                         if vec_ty_match is not None and struct_name.startswith("LDKCVecTempl_"):
1105                             vec_ty = vec_ty_match.group(1)
1106                         elif struct_name.startswith("LDKC2TupleTempl_") or struct_name.startswith("LDKC3TupleTempl_"):
1107                             is_tuple = True
1108                         trait_fn_match = line_indicates_trait_regex.match(struct_line)
1109                         if trait_fn_match is not None:
1110                             trait_fn_lines.append(trait_fn_match)
1111                         field_var_match = line_field_var_regex.match(struct_line)
1112                         if field_var_match is not None:
1113                             field_var_lines.append(field_var_match)
1114                         field_lines.append(struct_line)
1115
1116                 assert(struct_name is not None)
1117                 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))
1118                 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))
1119                 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))
1120                 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))
1121                 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))
1122                 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))
1123                 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))
1124
1125                 if is_opaque:
1126                     opaque_structs.add(struct_name)
1127                     with open(sys.argv[3] + "/structs/" + struct_name.replace("LDK","") + ".java", "w") as out_java_struct:
1128                         out_java_struct.write("package org.ldk.structs;\n\n")
1129                         out_java_struct.write("import org.ldk.impl.bindings;\n")
1130                         out_java_struct.write("import org.ldk.enums.*;\n\n")
1131                         out_java_struct.write("public class " + struct_name.replace("LDK","") + " extends CommonBase {\n")
1132                         out_java_struct.write("\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); }\n")
1133                         out_java_struct.write("\t@Override @SuppressWarnings(\"deprecation\")\n")
1134                         out_java_struct.write("\tprotected void finalize() throws Throwable {\n")
1135                         out_java_struct.write("\t\tbindings." + struct_name.replace("LDK","") + "_free(ptr); super.finalize();\n")
1136                         out_java_struct.write("\t}\n\n")
1137                 elif result_contents is not None:
1138                     result_templ_structs.add(struct_name)
1139                     assert result_contents in result_ptr_struct_items
1140                 elif struct_name.startswith("LDKCResultPtr_"):
1141                     for line in field_lines:
1142                         if line.endswith("*result;"):
1143                             res_ty = line[:-8].strip()
1144                         elif line.endswith("*err;"):
1145                             err_ty = line[:-5].strip()
1146                     result_ptr_struct_items[struct_name] = (res_ty, err_ty)
1147                 elif is_tuple:
1148                     out_java.write("\tpublic static native long " + struct_name + "_new(")
1149                     out_c.write("JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1new(JNIEnv *_env, jclass _b")
1150                     for idx, line in enumerate(field_lines):
1151                         if idx != 0 and idx < len(field_lines) - 2:
1152                             ty_info = java_c_types(line.strip(';'), None)
1153                             if idx != 1:
1154                                 out_java.write(", ")
1155                             e = chr(ord('a') + idx - 1)
1156                             out_java.write(ty_info.java_ty + " " + e)
1157                             out_c.write(", " + ty_info.c_ty + " " + e)
1158                     out_java.write(");\n")
1159                     out_c.write(") {\n")
1160                     out_c.write("\t" + struct_name + "* ret = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n")
1161                     for idx, line in enumerate(field_lines):
1162                         if idx != 0 and idx < len(field_lines) - 2:
1163                             ty_info = map_type(line.strip(';'), False, None, False)
1164                             e = chr(ord('a') + idx - 1)
1165                             if ty_info.arg_conv is not None:
1166                                 out_c.write("\t" + ty_info.arg_conv.replace("\n", "\n\t"))
1167                                 out_c.write("\n\tret->" + e + " = " + ty_info.arg_conv_name + ";\n")
1168                             else:
1169                                 out_c.write("\tret->" + e + " = " + e + ";\n")
1170                     out_c.write("\treturn (long)ret;\n")
1171                     out_c.write("}\n")
1172                 elif vec_ty is not None:
1173                     if vec_ty in opaque_structs:
1174                         out_java.write("\tpublic static native long[] " + struct_name + "_arr_info(long vec_ptr);\n")
1175                         out_c.write("JNIEXPORT jlongArray JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1arr_1info(JNIEnv *env, jclass _b, jlong ptr) {\n")
1176                     else:
1177                         out_java.write("\tpublic static native VecOrSliceDef " + struct_name + "_arr_info(long vec_ptr);\n")
1178                         out_c.write("JNIEXPORT jobject JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1arr_1info(JNIEnv *env, jclass _b, jlong ptr) {\n")
1179                     out_c.write("\t" + struct_name + " *vec = (" + struct_name + "*)ptr;\n")
1180                     if vec_ty in opaque_structs:
1181                         out_c.write("\tjlongArray ret = (*env)->NewLongArray(env, vec->datalen);\n")
1182                         out_c.write("\tjlong *ret_elems = (*env)->GetPrimitiveArrayCritical(env, ret, NULL);\n")
1183                         out_c.write("\tfor (size_t i = 0; i < vec->datalen; i++) {\n")
1184                         out_c.write("\t\tDO_ASSERT((((long)vec->data[i].inner) & 1) == 0);\n")
1185                         out_c.write("\t\tret_elems[i] = (long)vec->data[i].inner | (vec->data[i].is_owned ? 1 : 0);\n")
1186                         out_c.write("\t}\n")
1187                         out_c.write("\t(*env)->ReleasePrimitiveArrayCritical(env, ret, ret_elems, 0);\n")
1188                         out_c.write("\treturn ret;\n")
1189                     else:
1190                         out_c.write("\treturn (*env)->NewObject(env, slicedef_cls, slicedef_meth, (long)vec->data, (long)vec->datalen, sizeof(" + vec_ty + "));\n")
1191                     out_c.write("}\n")
1192
1193                     ty_info = map_type(vec_ty + " arr_elem", False, None, False)
1194                     if len(ty_info.java_fn_ty_arg) == 1: # ie we're a primitive of some form
1195                         out_java.write("\tpublic static native long " + struct_name + "_new(" + ty_info.java_ty + "[] elems);\n")
1196                         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")
1197                         out_c.write("\t" + struct_name + " *ret = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n")
1198                         out_c.write("\tret->datalen = (*env)->GetArrayLength(env, elems);\n")
1199                         out_c.write("\tif (ret->datalen == 0) {\n")
1200                         out_c.write("\t\tret->data = NULL;\n")
1201                         out_c.write("\t} else {\n")
1202                         out_c.write("\t\tret->data = MALLOC(sizeof(" + vec_ty + ") * ret->datalen, \"" + struct_name + " Data\");\n")
1203                         out_c.write("\t\t" + ty_info.c_ty + " *java_elems = (*env)->GetPrimitiveArrayCritical(env, elems, NULL);\n")
1204                         out_c.write("\t\tfor (size_t i = 0; i < ret->datalen; i++) {\n")
1205                         if ty_info.arg_conv is not None:
1206                             out_c.write("\t\t\t" + ty_info.c_ty + " arr_elem = java_elems[i];\n")
1207                             out_c.write("\t\t\t" + ty_info.arg_conv.replace("\n", "\n\t\t\t") + "\n")
1208                             out_c.write("\t\t\tret->data[i] = " + ty_info.arg_conv_name + ";\n")
1209                         else:
1210                             out_c.write("\t\t\tret->data[i] = java_elems[i];\n")
1211                         out_c.write("\t\t}\n")
1212                         out_c.write("\t\t(*env)->ReleasePrimitiveArrayCritical(env, elems, java_elems, 0);\n")
1213                         out_c.write("\t}\n")
1214                         out_c.write("\treturn (long)ret;\n")
1215                         out_c.write("}\n")
1216                 elif is_union_enum:
1217                     assert(struct_name.endswith("_Tag"))
1218                     struct_name = struct_name[:-4]
1219                     union_enum_items[struct_name] = {"field_lines": field_lines}
1220                 elif struct_name.endswith("_Body") and struct_name.split("_")[0] in union_enum_items:
1221                     enum_var_name = struct_name.split("_")
1222                     union_enum_items[enum_var_name[0]][enum_var_name[1]] = field_lines
1223                 elif struct_name in union_enum_items:
1224                     map_complex_enum(struct_name, union_enum_items[struct_name])
1225                 elif is_unitary_enum:
1226                     map_unitary_enum(struct_name, field_lines)
1227                 elif len(trait_fn_lines) > 0:
1228                     trait_structs.add(struct_name)
1229                     map_trait(struct_name, field_var_lines, trait_fn_lines)
1230                 cur_block_obj = None
1231         else:
1232             fn_ptr = fn_ptr_regex.match(line)
1233             fn_ret_arr = fn_ret_arr_regex.match(line)
1234             reg_fn = reg_fn_regex.match(line)
1235             const_val = const_val_regex.match(line)
1236
1237             if line.startswith("#include <"):
1238                 pass
1239             elif line.startswith("/*"):
1240                 #out_java.write("\t" + line)
1241                 if not line.endswith("*/\n"):
1242                     in_block_comment = True
1243             elif line.startswith("typedef enum "):
1244                 cur_block_obj = line
1245             elif line.startswith("typedef struct "):
1246                 cur_block_obj = line
1247             elif line.startswith("typedef union "):
1248                 cur_block_obj = line
1249             elif line.startswith("typedef "):
1250                 alias_match =  struct_alias_regex.match(line)
1251                 if alias_match.group(1) in result_templ_structs:
1252                     out_java.write("\tpublic static native boolean " + alias_match.group(2) + "_result_ok(long arg);\n")
1253                     out_java.write("\tpublic static native long " + alias_match.group(2) + "_get_inner(long arg);\n")
1254                     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")
1255                     out_c.write("\treturn ((" + alias_match.group(2) + "*)arg)->result_ok;\n")
1256                     out_c.write("}\n")
1257                     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")
1258                     contents_ty = alias_match.group(1).replace("LDKCResultTempl", "LDKCResultPtr")
1259                     res_ty, err_ty = result_ptr_struct_items[contents_ty]
1260                     out_c.write("\t" + alias_match.group(2) + " *val = (" + alias_match.group(2) + "*)arg;\n")
1261                     out_c.write("\tif (val->result_ok) {\n")
1262                     if res_ty not in opaque_structs:
1263                         out_c.write("\t\treturn (long)val->contents.result;\n")
1264                     else:
1265                         out_c.write("\t\treturn (long)(val->contents.result->inner) | (val->contents.result->is_owned ? 1 : 0);\n")
1266                     out_c.write("\t} else {\n")
1267                     if err_ty not in opaque_structs:
1268                         out_c.write("\t\treturn (long)val->contents.err;\n")
1269                     else:
1270                         out_c.write("\t\treturn (long)(val->contents.err->inner) | (val->contents.err->is_owned ? 1 : 0);\n")
1271                     out_c.write("\t}\n}\n")
1272                 pass
1273             elif fn_ptr is not None:
1274                 map_fn(line, fn_ptr, None, None)
1275             elif fn_ret_arr is not None:
1276                 map_fn(line, fn_ret_arr, fn_ret_arr.group(4), None)
1277             elif reg_fn is not None:
1278                 map_fn(line, reg_fn, None, None)
1279             elif const_val_regex is not None:
1280                 # TODO Map const variables
1281                 pass
1282             else:
1283                 assert(line == "\n")
1284
1285     out_java.write("}\n")
1286     for struct_name in opaque_structs:
1287         with open(sys.argv[3] + "/structs/" + struct_name.replace("LDK","") + ".java", "a") as out_java_struct:
1288             out_java_struct.write("}\n")