_ 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             arr_access = "compact_form"
 131
 132         if fn_arg.startswith("void"):
 133             java_ty = "void"
 134             c_ty = "void"
 135             fn_ty_arg = "V"
 136             fn_arg = fn_arg[4:].strip()
 137         elif fn_arg.startswith("bool"):
 138             java_ty = "boolean"
 139             c_ty = "jboolean"
 140             fn_ty_arg = "Z"
 141             fn_arg = fn_arg[4:].strip()
 142         elif fn_arg.startswith("uint8_t"):
 143             java_ty = "byte"
 144             c_ty = "jbyte"
 145             fn_ty_arg = "B"
 146             fn_arg = fn_arg[7:].strip()
 147         elif fn_arg.startswith("uint16_t"):
 148             java_ty = "short"
 149             c_ty = "jshort"
 150             fn_ty_arg = "S"
 151             fn_arg = fn_arg[8:].strip()
 152         elif fn_arg.startswith("uint32_t"):
 153             java_ty = "int"
 154             c_ty = "jint"
 155             fn_ty_arg = "I"
 156             fn_arg = fn_arg[8:].strip()
 157         elif fn_arg.startswith("uint64_t") or fn_arg.startswith("uintptr_t"):
 158             java_ty = "long"
 159             c_ty = "jlong"
 160             fn_ty_arg = "J"
 161             if fn_arg.startswith("uint64_t"):
 162                 fn_arg = fn_arg[8:].strip()
 163             else:
 164                 fn_arg = fn_arg[9:].strip()
 165         elif is_const and fn_arg.startswith("char *"):
 166             java_ty = "String"
 167             c_ty = "const char*"
 168             fn_ty_arg = "Ljava/lang/String;"
 169             fn_arg = fn_arg[6:].strip()
 170         else:
 171             ma = var_ty_regex.match(fn_arg)
 172             if ma.group(1).strip() in unitary_enums:
 173                 java_ty = ma.group(1).strip()
 174                 c_ty = "jclass"
 175                 fn_ty_arg = "Lorg/ldk/enums/" + ma.group(1).strip() + ";"
 176                 fn_arg = ma.group(2).strip()
 177                 rust_obj = ma.group(1).strip()
 178                 take_by_ptr = True
 179             else:
 180                 java_ty = "long"
 181                 c_ty = "jlong"
 182                 fn_ty_arg = "J"
 183                 fn_arg = ma.group(2).strip()
 184                 rust_obj = ma.group(1).strip()
 185                 take_by_ptr = True
 186
 187         if fn_arg.startswith(" *") or fn_arg.startswith("*"):
 188             fn_arg = fn_arg.replace("*", "").strip()
 189             is_ptr = True
 190             c_ty = "jlong"
 191             java_ty = "long"
 192             fn_ty_arg = "J"
 193
 194         var_is_arr = var_is_arr_regex.match(fn_arg)
 195         if var_is_arr is not None or ret_arr_len is not None:
 196             assert(not take_by_ptr)
 197             assert(not is_ptr)
 198             java_ty = java_ty + "[]"
 199             c_ty = c_ty + "Array"
 200             if var_is_arr is not None:
 201                 if var_is_arr.group(1) == "":
 202                     return TypeInfo(rust_obj=rust_obj, java_ty=java_ty, java_fn_ty_arg="[" + fn_ty_arg, c_ty=c_ty,
 203                         passed_as_ptr=False, is_ptr=False, var_name="arg", arr_len=var_is_arr.group(2), arr_access=arr_access)
 204                 return TypeInfo(rust_obj=rust_obj, java_ty=java_ty, java_fn_ty_arg="[" + fn_ty_arg, c_ty=c_ty,
 205                     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)
 206         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,
 207             is_ptr=is_ptr, var_name=fn_arg, arr_len=None, arr_access=None)
 208
 209     def map_type(fn_arg, print_void, ret_arr_len, is_free):
 210         ty_info = java_c_types(fn_arg, ret_arr_len)
 211
 212         if ty_info.c_ty == "void":
 213             if not print_void:
 214                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 215                     arg_conv = None, arg_conv_name = None, ret_conv = None, ret_conv_name = None)
 216
 217         if ty_info.c_ty.endswith("Array"):
 218             arr_len = ty_info.arr_len
 219             if arr_len is not None:
 220                 arr_name = ty_info.var_name
 221             else:
 222                 arr_name = "ret"
 223                 arr_len = ret_arr_len
 224             assert(ty_info.c_ty == "jbyteArray")
 225             if ty_info.rust_obj is not None:
 226                 arg_conv = ty_info.rust_obj + " " + arr_name + "_ref;\n"
 227                 arg_conv = arg_conv + "DO_ASSERT((*_env)->GetArrayLength (_env, " + arr_name + ") == " + arr_len + ");\n"
 228                 arg_conv = arg_conv + "(*_env)->GetByteArrayRegion (_env, " + arr_name + ", 0, " + arr_len + ", " + arr_name + "_ref." + ty_info.arr_access + ");"
 229                 arr_access = ("", "." + ty_info.arr_access)
 230             else:
 231                 arg_conv = "unsigned char " + arr_name + "_arr[" + arr_len + "];\n"
 232                 arg_conv = arg_conv + "DO_ASSERT((*_env)->GetArrayLength (_env, " + arr_name + ") == " + arr_len + ");\n"
 233                 arg_conv = arg_conv + "(*_env)->GetByteArrayRegion (_env, " + arr_name + ", 0, " + arr_len + ", " + arr_name + "_arr);\n" + "unsigned char (*" + arr_name + "_ref)[" + arr_len + "] = &" + arr_name + "_arr;"
 234                 arr_access = ("*", "")
 235             return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 236                 arg_conv = arg_conv,
 237                 arg_conv_name = arr_name + "_ref",
 238                 ret_conv = ("jbyteArray " + arr_name + "_arr = (*_env)->NewByteArray(_env, " + arr_len + ");\n" +
 239                     "(*_env)->SetByteArrayRegion(_env, " + arr_name + "_arr, 0, " + arr_len + ", " + arr_access[0],
 240                     arr_access[1] + ");"),
 241                 ret_conv_name = arr_name + "_arr")
 242         elif ty_info.var_name != "":
 243             # If we have a parameter name, print it (noting that it may indicate its a pointer)
 244             if ty_info.rust_obj is not None:
 245                 assert(ty_info.passed_as_ptr)
 246                 opaque_arg_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv;\n"
 247                 opaque_arg_conv = opaque_arg_conv + ty_info.var_name + "_conv.inner = (void*)(" + ty_info.var_name + " & (~1));\n"
 248                 opaque_arg_conv = opaque_arg_conv + ty_info.var_name + "_conv.is_owned = (" + ty_info.var_name + " & 1) || (" + ty_info.var_name + " == 0);"
 249                 if (ty_info.rust_obj.replace("LDK", "") + "_clone") in clone_fns and not ty_info.is_ptr and not is_free:
 250                     # 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.
 251                     opaque_arg_conv = opaque_arg_conv + "\nif (" + ty_info.var_name + "_conv.inner != NULL)\n"
 252                     opaque_arg_conv = opaque_arg_conv + "\t" + ty_info.var_name + "_conv = " + ty_info.rust_obj.replace("LDK", "") + "_clone(&" + ty_info.var_name + "_conv);"
 253                 if not ty_info.is_ptr:
 254                     if ty_info.rust_obj in unitary_enums:
 255                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 256                             arg_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv = " + ty_info.rust_obj + "_from_java(_env, " + ty_info.var_name + ");",
 257                             arg_conv_name = ty_info.var_name + "_conv",
 258                             ret_conv = ("jclass " + ty_info.var_name + "_conv = " + ty_info.rust_obj + "_to_java(_env, ", ");"),
 259                             ret_conv_name = ty_info.var_name + "_conv")
 260                     if ty_info.rust_obj in opaque_structs:
 261                         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"
 262                         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"
 263                         ret_conv_suf = ret_conv_suf + "long " + ty_info.var_name + "_ref;\n"
 264                         ret_conv_suf = ret_conv_suf + "if (" + ty_info.var_name + "_var.is_owned) {\n"
 265                         ret_conv_suf = ret_conv_suf + "\t" + ty_info.var_name + "_ref = (long)" + ty_info.var_name + "_var.inner | 1;\n"
 266                         ret_conv_suf = ret_conv_suf + "} else {\n"
 267                         ret_conv_suf = ret_conv_suf + "\t" + ty_info.var_name + "_ref = (long)&" + ty_info.var_name + "_var;\n"
 268                         ret_conv_suf = ret_conv_suf + "}"
 269                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 270                             arg_conv = opaque_arg_conv, arg_conv_name = ty_info.var_name + "_conv",
 271                             ret_conv = (ty_info.rust_obj + " " + ty_info.var_name + "_var = ", ret_conv_suf),
 272                             ret_conv_name = ty_info.var_name + "_ref")
 273                     base_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv = *(" + ty_info.rust_obj + "*)" + ty_info.var_name + ";";
 274                     if ty_info.rust_obj in trait_structs:
 275                         if not is_free:
 276                             base_conv = base_conv + "\nif (" + ty_info.var_name + "_conv.free == " + ty_info.rust_obj + "_JCalls_free) {\n"
 277                             base_conv = base_conv + "\t// If this_arg is a JCalls struct, then we need to increment the refcnt in it.\n"
 278                             base_conv = base_conv + "\t" + ty_info.rust_obj + "_JCalls_clone(" + ty_info.var_name + "_conv.this_arg);\n}"
 279                         else:
 280                             base_conv = base_conv + "\n" + "FREE((void*)" + ty_info.var_name + ");"
 281                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 282                             arg_conv = base_conv,
 283                             arg_conv_name = ty_info.var_name + "_conv",
 284                             ret_conv = ("CANT PASS TRAIT TO Java?", ""), ret_conv_name = "NO CONV POSSIBLE")
 285                     if ty_info.rust_obj != "LDKu8slice":
 286                         # Don't bother free'ing slices passed in - Rust doesn't auto-free the
 287                         # underlying unlike Vecs, and it gives Java more freedom.
 288                         base_conv = base_conv + "\nFREE((void*)" + ty_info.var_name + ");";
 289                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 290                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv",
 291                         ret_conv = ("long " + ty_info.var_name + "_ref = (long)&", ";"), ret_conv_name = ty_info.var_name + "_ref")
 292                 else:
 293                     assert(not is_free)
 294                     if ty_info.rust_obj in opaque_structs:
 295                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 296                             arg_conv = opaque_arg_conv, arg_conv_name = "&" + ty_info.var_name + "_conv",
 297                             ret_conv = None, ret_conv_name = None) # its a pointer, no conv needed
 298                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 299                         arg_conv = ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)" + ty_info.var_name + ";",
 300                         arg_conv_name = ty_info.var_name + "_conv",
 301                         ret_conv = None, ret_conv_name = None) # its a pointer, no conv needed
 302             elif ty_info.is_ptr:
 303                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 304                     arg_conv = None, arg_conv_name = ty_info.var_name, ret_conv = None, ret_conv_name = None)
 305             elif ty_info.java_ty == "String":
 306                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 307                     arg_conv = None, arg_conv_name = None,
 308                     ret_conv = ("jstring " + ty_info.var_name + "_conv = (*_env)->NewStringUTF(_env, ", ");"), ret_conv_name = ty_info.var_name + "_conv")
 309             else:
 310                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 311                     arg_conv = None, arg_conv_name = ty_info.var_name, ret_conv = None, ret_conv_name = None)
 312         elif not print_void:
 313             # We don't have a parameter name, and want one, just call it arg
 314             if ty_info.rust_obj is not None:
 315                 assert(not is_free or ty_info.rust_obj not in opaque_structs);
 316                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 317                     arg_conv = ty_info.rust_obj + " arg_conv = *(" + ty_info.rust_obj + "*)arg;\nFREE((void*)arg);",
 318                     arg_conv_name = "arg_conv",
 319                     ret_conv = None, ret_conv_name = None)
 320             else:
 321                 assert(not is_free)
 322                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 323                     arg_conv = None, arg_conv_name = "arg", ret_conv = None, ret_conv_name = None)
 324         else:
 325             # We don't have a parameter name, and don't want one (cause we're returning)
 326             if ty_info.rust_obj is not None:
 327                 if not ty_info.is_ptr:
 328                     if ty_info.rust_obj in unitary_enums:
 329                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 330                             arg_conv = ty_info.rust_obj + " ret = " + ty_info.rust_obj + "_from_java(_env, " + ty_info.var_name + ");",
 331                             arg_conv_name = "ret",
 332                             ret_conv = ("jclass ret = " + ty_info.rust_obj + "_to_java(_env, ", ");"), ret_conv_name = "ret")
 333                     if ty_info.rust_obj in opaque_structs:
 334                         # If we're returning a newly-allocated struct, we don't want Rust to ever
 335                         # free, instead relying on the Java GC to lose the ref. We undo this in
 336                         # any _free function.
 337                         # To avoid any issues, we first assert that the incoming object is non-ref.
 338                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 339                             ret_conv = (ty_info.rust_obj + " ret = ", ";"),
 340                             ret_conv_name = "((long)ret.inner) | (ret.is_owned ? 1 : 0)",
 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 = (ty_info.rust_obj + "* ret = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n*ret = ", ";"),
 345                             ret_conv_name = "(long)ret",
 346                             arg_conv = None, arg_conv_name = None)
 347                 else:
 348                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 349                         ret_conv = ("long ret = (long)", ";"), ret_conv_name = "ret",
 350                         arg_conv = None, arg_conv_name = None)
 351             else:
 352                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 353                     arg_conv = None, arg_conv_name = None, ret_conv = None, ret_conv_name = None)
 354
 355     def map_fn(line, re_match, ret_arr_len, c_call_string):
 356         out_java.write("\t// " + line)
 357         out_java.write("\tpublic static native ")
 358         out_c.write("JNIEXPORT ")
 359
 360         is_free = re_match.group(2).endswith("_free")
 361         struct_meth = re_match.group(2).split("_")[0]
 362
 363         ret_info = map_type(re_match.group(1), True, ret_arr_len, False)
 364         ret_info.print_ty()
 365
 366         if ret_info.ret_conv is not None:
 367             ret_conv_pfx, ret_conv_sfx = ret_info.ret_conv
 368
 369         out_java.write(" " + re_match.group(2) + "(")
 370         out_c.write(" JNICALL Java_org_ldk_impl_bindings_" + re_match.group(2).replace('_', '_1') + "(JNIEnv * _env, jclass _b")
 371
 372         arg_names = []
 373         takes_self = False
 374         args_known = not ret_info.passed_as_ptr or ret_info.rust_obj in opaque_structs or ret_info.rust_obj in trait_structs
 375         for idx, arg in enumerate(re_match.group(3).split(',')):
 376             if idx != 0:
 377                 out_java.write(", ")
 378             if arg != "void":
 379                 out_c.write(", ")
 380             arg_conv_info = map_type(arg, False, None, is_free)
 381             if arg_conv_info.c_ty != "void":
 382                 arg_conv_info.print_ty()
 383                 arg_conv_info.print_name()
 384             if arg_conv_info.arg_name == "this_arg":
 385                 takes_self = True
 386             if arg_conv_info.passed_as_ptr and not arg_conv_info.rust_obj in opaque_structs:
 387                 if not arg_conv_info.rust_obj in trait_structs and not arg_conv_info.rust_obj in unitary_enums:
 388                     print(re_match.group(2) + " bad - " + arg_conv_info.rust_obj)
 389                     args_known = False
 390             arg_names.append(arg_conv_info)
 391
 392         out_java_struct = None
 393         if ("LDK" + struct_meth in opaque_structs or "LDK" + struct_meth in trait_structs) and not is_free:
 394             out_java_struct = open(sys.argv[3] + "/structs/" + struct_meth + ".java", "a")
 395             if not args_known:
 396                 out_java_struct.write("\t// Skipped " + re_match.group(2) + "\n")
 397                 out_java_struct.close()
 398                 out_java_struct = None
 399             else:
 400                 out_java_struct.write("\tpublic ")
 401                 meth_n = re_match.group(2)[len(struct_meth) + 1:]
 402                 if ret_info.rust_obj == "LDK" + struct_meth:
 403                     out_java_struct.write(struct_meth + "(")
 404                 elif ret_info.rust_obj in opaque_structs or ret_info.rust_obj in trait_structs:
 405                     out_java_struct.write(ret_info.rust_obj.replace("LDK", "") + " " + meth_n + "(")
 406                 else:
 407                     out_java_struct.write(ret_info.java_ty + " " + meth_n + "(")
 408                 for idx, arg in enumerate(arg_names):
 409                     if idx != 0:
 410                         if not takes_self or idx > 1:
 411                             out_java_struct.write(", ")
 412                     if arg.java_ty != "void" and arg.arg_name != "this_arg":
 413                         if arg.passed_as_ptr:
 414                             if arg.rust_obj in opaque_structs or arg.rust_obj in trait_structs:
 415                                 out_java_struct.write(arg.rust_obj.replace("LDK", "") + " " + arg.arg_name)
 416                             else:
 417                                 out_java_struct.write(arg.rust_obj + " " + arg.arg_name)
 418                         else:
 419                             out_java_struct.write(arg.java_ty + " " + arg.arg_name)
 420
 421
 422         out_java.write(");\n")
 423         out_c.write(") {\n")
 424         if out_java_struct is not None:
 425             out_java_struct.write(") {\n")
 426
 427         for info in arg_names:
 428             if info.arg_conv is not None:
 429                 out_c.write("\t" + info.arg_conv.replace('\n', "\n\t") + "\n");
 430
 431         if ret_info.ret_conv is not None:
 432             out_c.write("\t" + ret_conv_pfx.replace('\n', '\n\t'));
 433         else:
 434             out_c.write("\treturn ");
 435
 436         if c_call_string is None:
 437             out_c.write(re_match.group(2) + "(")
 438         else:
 439             out_c.write(c_call_string)
 440         for idx, info in enumerate(arg_names):
 441             if info.arg_conv_name is not None:
 442                 if idx != 0:
 443                     out_c.write(", ")
 444                 elif c_call_string is not None:
 445                     continue
 446                 out_c.write(info.arg_conv_name)
 447         out_c.write(")")
 448         if ret_info.ret_conv is not None:
 449             out_c.write(ret_conv_sfx.replace('\n', '\n\t'))
 450             out_c.write("\n\treturn " + ret_info.ret_conv_name + ";")
 451         else:
 452             out_c.write(";")
 453         out_c.write("\n}\n\n")
 454         if out_java_struct is not None:
 455             out_java_struct.write("\t\t")
 456             if ret_info.rust_obj == "LDK" + struct_meth:
 457                 out_java_struct.write("super(")
 458             elif ret_info.java_ty != "void" and not ret_info.passed_as_ptr:
 459                 out_java_struct.write(ret_info.java_ty + " ret = ")
 460             elif ret_info.java_ty != "void":
 461                 out_java_struct.write(ret_info.rust_obj.replace("LDK", "") + " ret = ")
 462                 if ret_info.rust_obj in opaque_structs or ret_info.rust_obj in trait_structs:
 463                     out_java_struct.write("new " + ret_info.rust_obj.replace("LDK", "") + "(null, ")
 464             out_java_struct.write("bindings." + re_match.group(2) + "(")
 465             for idx, info in enumerate(arg_names):
 466                 if idx != 0:
 467                     out_java_struct.write(", ")
 468                 if info.arg_name == "this_arg":
 469                     out_java_struct.write("this.ptr")
 470                 elif info.passed_as_ptr and info.rust_obj in opaque_structs:
 471                     out_java_struct.write(info.arg_name + ".ptr & ~1")
 472                 elif info.passed_as_ptr and info.rust_obj in trait_structs:
 473                     out_java_struct.write(info.arg_name + ".ptr")
 474                 else:
 475                     out_java_struct.write(info.arg_name)
 476             out_java_struct.write(")")
 477             if ret_info.rust_obj == "LDK" + struct_meth:
 478                 out_java_struct.write(");\n")
 479             elif ret_info.rust_obj in opaque_structs:
 480                 out_java_struct.write(");\n")
 481             elif ret_info.rust_obj in trait_structs:
 482                 out_java_struct.write(");\n\t\tret.ptrs_to.add(this);\n")
 483             else:
 484                 out_java_struct.write(";\n")
 485
 486             for info in arg_names:
 487                 if info.arg_name == "this_arg":
 488                     pass
 489                 elif info.passed_as_ptr and (info.rust_obj in opaque_structs or info.rust_obj in trait_structs):
 490                     out_java_struct.write("\t\tthis.ptrs_to.add(" + info.arg_name + ");\n")
 491
 492             if ret_info.java_ty != "void" and ret_info.rust_obj != "LDK" + struct_meth:
 493                 out_java_struct.write("\t\treturn ret;\n")
 494             out_java_struct.write("\t}\n\n")
 495             out_java_struct.close()
 496
 497     def map_unitary_enum(struct_name, field_lines):
 498         with open(sys.argv[3] + "/enums/" + struct_name + ".java", "w") as out_java_enum:
 499             out_java_enum.write("package org.ldk.enums;\n\n")
 500             unitary_enums.add(struct_name)
 501             out_c.write("static inline " + struct_name + " " + struct_name + "_from_java(JNIEnv *env, jclass val) {\n")
 502             out_c.write("\tswitch ((*env)->CallIntMethod(env, val, ordinal_meth)) {\n")
 503             ord_v = 0
 504             for idx, struct_line in enumerate(field_lines):
 505                 if idx == 0:
 506                     out_java_enum.write("public enum " + struct_name + " {\n")
 507                 elif idx == len(field_lines) - 3:
 508                     assert(struct_line.endswith("_Sentinel,"))
 509                 elif idx == len(field_lines) - 2:
 510                     out_java_enum.write("\t; static native void init();\n")
 511                     out_java_enum.write("\tstatic { init(); }\n")
 512                     out_java_enum.write("}")
 513                     out_java.write("\tstatic { " + struct_name + ".values(); /* Force enum statics to run */ }\n")
 514                 elif idx == len(field_lines) - 1:
 515                     assert(struct_line == "")
 516                 else:
 517                     out_java_enum.write(struct_line + "\n")
 518                     out_c.write("\t\tcase %d: return %s;\n" % (ord_v, struct_line.strip().strip(",")))
 519                     ord_v = ord_v + 1
 520             out_c.write("\t}\n")
 521             out_c.write("\tabort();\n")
 522             out_c.write("}\n")
 523
 524             ord_v = 0
 525             out_c.write("static jclass " + struct_name + "_class = NULL;\n")
 526             for idx, struct_line in enumerate(field_lines):
 527                 if idx > 0 and idx < len(field_lines) - 3:
 528                     variant = struct_line.strip().strip(",")
 529                     out_c.write("static jfieldID " + struct_name + "_" + variant + " = NULL;\n")
 530             out_c.write("JNIEXPORT void JNICALL Java_org_ldk_enums_" + struct_name.replace("_", "_1") + "_init (JNIEnv * env, jclass clz) {\n")
 531             out_c.write("\t" + struct_name + "_class = (*env)->NewGlobalRef(env, clz);\n")
 532             out_c.write("\tDO_ASSERT(" + struct_name + "_class != NULL);\n")
 533             for idx, struct_line in enumerate(field_lines):
 534                 if idx > 0 and idx < len(field_lines) - 3:
 535                     variant = struct_line.strip().strip(",")
 536                     out_c.write("\t" + struct_name + "_" + variant + " = (*env)->GetStaticFieldID(env, " + struct_name + "_class, \"" + variant + "\", \"Lorg/ldk/enums/" + struct_name + ";\");\n")
 537                     out_c.write("\tDO_ASSERT(" + struct_name + "_" + variant + " != NULL);\n")
 538             out_c.write("}\n")
 539             out_c.write("static inline jclass " + struct_name + "_to_java(JNIEnv *env, " + struct_name + " val) {\n")
 540             out_c.write("\tswitch (val) {\n")
 541             for idx, struct_line in enumerate(field_lines):
 542                 if idx > 0 and idx < len(field_lines) - 3:
 543                     variant = struct_line.strip().strip(",")
 544                     out_c.write("\t\tcase " + variant + ":\n")
 545                     out_c.write("\t\t\treturn (*env)->GetStaticObjectField(env, " + struct_name + "_class, " + struct_name + "_" + variant + ");\n")
 546                     ord_v = ord_v + 1
 547             out_c.write("\t\tdefault: abort();\n")
 548             out_c.write("\t}\n")
 549             out_c.write("}\n\n")
 550
 551     def map_complex_enum(struct_name, union_enum_items):
 552         tag_field_lines = union_enum_items["field_lines"]
 553         init_meth_jty_strs = {}
 554         for idx, struct_line in enumerate(tag_field_lines):
 555             if idx == 0:
 556                 out_java.write("\tpublic static class " + struct_name + " {\n")
 557                 out_java.write("\t\tprivate " + struct_name + "() {}\n")
 558             elif idx == len(tag_field_lines) - 3:
 559                 assert(struct_line.endswith("_Sentinel,"))
 560             elif idx == len(tag_field_lines) - 2:
 561                 out_java.write("\t\tstatic native void init();\n")
 562                 out_java.write("\t}\n")
 563             elif idx == len(tag_field_lines) - 1:
 564                 assert(struct_line == "")
 565             else:
 566                 var_name = struct_line.strip(' ,')[len(struct_name) + 1:]
 567                 out_java.write("\t\tpublic final static class " + var_name + " extends " + struct_name + " {\n")
 568                 out_c.write("static jclass " + struct_name + "_" + var_name + "_class = NULL;\n")
 569                 out_c.write("static jmethodID " + struct_name + "_" + var_name + "_meth = NULL;\n")
 570                 init_meth_jty_str = ""
 571                 init_meth_params = ""
 572                 init_meth_body = ""
 573                 if "LDK" + var_name in union_enum_items:
 574                     enum_var_lines = union_enum_items["LDK" + var_name]
 575                     for idx, field in enumerate(enum_var_lines):
 576                         if idx != 0 and idx < len(enum_var_lines) - 2:
 577                             field_ty = java_c_types(field.strip(' ;'), None)
 578                             out_java.write("\t\t\tpublic " + field_ty.java_ty + " " + field_ty.var_name + ";\n")
 579                             init_meth_jty_str = init_meth_jty_str + field_ty.java_fn_ty_arg
 580                             if idx > 1:
 581                                 init_meth_params = init_meth_params + ", "
 582                             init_meth_params = init_meth_params + field_ty.java_ty + " " + field_ty.var_name
 583                             init_meth_body = init_meth_body + "this." + field_ty.var_name + " = " + field_ty.var_name + "; "
 584                     out_java.write("\t\t\t" + var_name + "(" + init_meth_params + ") { ")
 585                     out_java.write(init_meth_body)
 586                     out_java.write("}\n")
 587                 out_java.write("\t\t}\n")
 588                 init_meth_jty_strs[var_name] = init_meth_jty_str
 589         out_java.write("\tstatic { " + struct_name + ".init(); }\n")
 590         out_java.write("\tpublic static native " + struct_name + " " + struct_name + "_ref_from_ptr(long ptr);\n");
 591
 592         out_c.write("JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_00024" + struct_name.replace("_", "_1") + "_init (JNIEnv * env, jclass _a) {\n")
 593         for idx, struct_line in enumerate(tag_field_lines):
 594             if idx != 0 and idx < len(tag_field_lines) - 3:
 595                 var_name = struct_line.strip(' ,')[len(struct_name) + 1:]
 596                 out_c.write("\t" + struct_name + "_" + var_name + "_class =\n")
 597                 out_c.write("\t\t(*env)->NewGlobalRef(env, (*env)->FindClass(env, \"Lorg/ldk/impl/bindings$" + struct_name + "$" + var_name + ";\"));\n")
 598                 out_c.write("\tDO_ASSERT(" + struct_name + "_" + var_name + "_class != NULL);\n")
 599                 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")
 600                 out_c.write("\tDO_ASSERT(" + struct_name + "_" + var_name + "_meth != NULL);\n")
 601         out_c.write("}\n")
 602         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")
 603         out_c.write("\t" + struct_name + " *obj = (" + struct_name + "*)ptr;\n")
 604         out_c.write("\tswitch(obj->tag) {\n")
 605         for idx, struct_line in enumerate(tag_field_lines):
 606             if idx != 0 and idx < len(tag_field_lines) - 3:
 607                 var_name = struct_line.strip(' ,')[len(struct_name) + 1:]
 608                 out_c.write("\t\tcase " + struct_name + "_" + var_name + ": {\n")
 609                 c_params_text = ""
 610                 if "LDK" + var_name in union_enum_items:
 611                     enum_var_lines = union_enum_items["LDK" + var_name]
 612                     for idx, field in enumerate(enum_var_lines):
 613                         if idx != 0 and idx < len(enum_var_lines) - 2:
 614                             field_map = map_type(field.strip(' ;'), False, None, False)
 615                             if field_map.ret_conv is not None:
 616                                 out_c.write("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t").replace("_env", "env"))
 617                                 out_c.write("obj->" + camel_to_snake(var_name) + "." + field_map.arg_name)
 618                                 out_c.write(field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
 619                                 c_params_text = c_params_text + ", " + field_map.ret_conv_name
 620                             else:
 621                                 c_params_text = c_params_text + ", obj->" + camel_to_snake(var_name) + "." + field_map.arg_name
 622                 out_c.write("\t\t\treturn (*env)->NewObject(env, " + struct_name + "_" + var_name + "_class, " + struct_name + "_" + var_name + "_meth" + c_params_text + ");\n")
 623                 out_c.write("\t\t}\n")
 624         out_c.write("\t\tdefault: abort();\n")
 625         out_c.write("\t}\n}\n")
 626
 627     def map_trait(struct_name, field_var_lines, trait_fn_lines):
 628         with open(sys.argv[3] + "/structs/" + struct_name.replace("LDK","") + ".java", "w") as out_java_trait:
 629             out_c.write("typedef struct " + struct_name + "_JCalls {\n")
 630             out_c.write("\tatomic_size_t refcnt;\n")
 631             out_c.write("\tJavaVM *vm;\n")
 632             out_c.write("\tjweak o;\n")
 633             for var_line in field_var_lines:
 634                 if var_line.group(1) in trait_structs:
 635                     out_c.write("\t" + var_line.group(1) + "_JCalls* " + var_line.group(2) + ";\n")
 636             for fn_line in trait_fn_lines:
 637                 if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
 638                     out_c.write("\tjmethodID " + fn_line.group(2) + "_meth;\n")
 639             out_c.write("} " + struct_name + "_JCalls;\n")
 640
 641             out_java_trait.write("package org.ldk.structs;\n\n")
 642             out_java_trait.write("import org.ldk.impl.bindings;\n\n")
 643             out_java_trait.write("import org.ldk.enums.*;\n\n")
 644             out_java_trait.write("public class " + struct_name.replace("LDK","") + " extends CommonBase {\n")
 645             out_java_trait.write("\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); }\n")
 646             out_java_trait.write("\tpublic " + struct_name.replace("LDK", "") + "(bindings." + struct_name + " arg")
 647             for var_line in field_var_lines:
 648                 if var_line.group(1) in trait_structs:
 649                     out_java_trait.write(", bindings." + var_line.group(1) + " " + var_line.group(2))
 650             out_java_trait.write(") {\n")
 651             out_java_trait.write("\t\tsuper(bindings." + struct_name + "_new(arg")
 652             for var_line in field_var_lines:
 653                 if var_line.group(1) in trait_structs:
 654                     out_java_trait.write(", " + var_line.group(2))
 655             out_java_trait.write("));\n")
 656             out_java_trait.write("\t\tthis.ptrs_to.add(arg);\n")
 657             out_java_trait.write("\t}\n")
 658             out_java_trait.write("\t@Override @SuppressWarnings(\"deprecation\")\n")
 659             out_java_trait.write("\tprotected void finalize() throws Throwable {\n")
 660             out_java_trait.write("\t\tbindings." + struct_name.replace("LDK","") + "_free(ptr); super.finalize();\n")
 661             out_java_trait.write("\t}\n\n")
 662
 663             out_java.write("\tpublic interface " + struct_name + " {\n")
 664             java_meths = []
 665             for fn_line in trait_fn_lines:
 666                 java_meth_descr = "("
 667                 if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
 668                     ret_ty_info = java_c_types(fn_line.group(1), None)
 669
 670                     out_java.write("\t\t " + ret_ty_info.java_ty + " " + fn_line.group(2) + "(")
 671                     is_const = fn_line.group(3) is not None
 672                     out_c.write(fn_line.group(1) + fn_line.group(2) + "_jcall(")
 673                     if is_const:
 674                         out_c.write("const void* this_arg")
 675                     else:
 676                         out_c.write("void* this_arg")
 677
 678                     arg_names = []
 679                     for idx, arg in enumerate(fn_line.group(4).split(',')):
 680                         if arg == "":
 681                             continue
 682                         if idx >= 2:
 683                             out_java.write(", ")
 684                         out_c.write(", ")
 685                         arg_conv_info = map_type(arg, True, None, False)
 686                         out_c.write(arg.strip())
 687                         out_java.write(arg_conv_info.java_ty + " " + arg_conv_info.arg_name)
 688                         arg_names.append(arg_conv_info)
 689                         java_meth_descr = java_meth_descr + arg_conv_info.java_fn_ty_arg
 690                     java_meth_descr = java_meth_descr + ")" + ret_ty_info.java_fn_ty_arg
 691                     java_meths.append(java_meth_descr)
 692
 693                     out_java.write(");\n")
 694                     out_c.write(") {\n")
 695                     out_c.write("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
 696                     out_c.write("\tJNIEnv *env;\n")
 697                     out_c.write("\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_8) == JNI_OK);\n")
 698
 699                     for arg_info in arg_names:
 700                         if arg_info.ret_conv is not None:
 701                             out_c.write("\t" + arg_info.ret_conv[0].replace('\n', '\n\t').replace("_env", "env"));
 702                             out_c.write(arg_info.arg_name)
 703                             out_c.write(arg_info.ret_conv[1].replace('\n', '\n\t').replace("_env", "env") + "\n")
 704
 705                     out_c.write("\tjobject obj = (*env)->NewLocalRef(env, j_calls->o);\n\tDO_ASSERT(obj != NULL);\n")
 706                     if ret_ty_info.c_ty.endswith("Array"):
 707                         assert(ret_ty_info.c_ty == "jbyteArray")
 708                         out_c.write("\tjbyteArray jret = (*env)->CallObjectMethod(env, obj, j_calls->" + fn_line.group(2) + "_meth")
 709                     elif not ret_ty_info.passed_as_ptr:
 710                         out_c.write("\treturn (*env)->Call" + ret_ty_info.java_ty.title() + "Method(env, obj, j_calls->" + fn_line.group(2) + "_meth")
 711                     else:
 712                         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");
 713
 714                     for arg_info in arg_names:
 715                         if arg_info.ret_conv is not None:
 716                             out_c.write(", " + arg_info.ret_conv_name)
 717                         else:
 718                             out_c.write(", " + arg_info.arg_name)
 719                     out_c.write(");\n");
 720                     if ret_ty_info.c_ty.endswith("Array"):
 721                         out_c.write("\t" + ret_ty_info.rust_obj + " ret;\n")
 722                         out_c.write("\tDO_ASSERT((*env)->GetArrayLength(env, jret) == " + ret_ty_info.arr_len + ");\n")
 723                         out_c.write("\t(*env)->GetByteArrayRegion(env, jret, 0, " + ret_ty_info.arr_len + ", ret." + ret_ty_info.arr_access + ");\n")
 724                         out_c.write("\treturn ret;\n")
 725
 726                     if ret_ty_info.passed_as_ptr:
 727                         out_c.write("\t" + fn_line.group(1).strip() + " res = *ret;\n")
 728                         out_c.write("\tFREE(ret);\n")
 729                         out_c.write("\treturn res;\n")
 730                     out_c.write("}\n")
 731                 elif fn_line.group(2) == "free":
 732                     out_c.write("static void " + struct_name + "_JCalls_free(void* this_arg) {\n")
 733                     out_c.write("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
 734                     out_c.write("\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n")
 735                     out_c.write("\t\tJNIEnv *env;\n")
 736                     out_c.write("\t\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_8) == JNI_OK);\n")
 737                     out_c.write("\t\t(*env)->DeleteWeakGlobalRef(env, j_calls->o);\n")
 738                     out_c.write("\t\tFREE(j_calls);\n")
 739                     out_c.write("\t}\n}\n")
 740
 741             # Write out a clone function whether we need one or not, as we use them in moving to rust
 742             out_c.write("static void* " + struct_name + "_JCalls_clone(const void* this_arg) {\n")
 743             out_c.write("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
 744             out_c.write("\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n")
 745             for var_line in field_var_lines:
 746                 if var_line.group(1) in trait_structs:
 747                     out_c.write("\tatomic_fetch_add_explicit(&j_calls->" + var_line.group(2) + "->refcnt, 1, memory_order_release);\n")
 748             out_c.write("\treturn (void*) this_arg;\n")
 749             out_c.write("}\n")
 750
 751             out_java.write("\t}\n")
 752
 753             out_java.write("\tpublic static native long " + struct_name + "_new(" + struct_name + " impl")
 754             out_c.write("static inline " + struct_name + " " + struct_name + "_init (JNIEnv * env, jclass _a, jobject o")
 755             for var_line in field_var_lines:
 756                 if var_line.group(1) in trait_structs:
 757                     out_java.write(", " + var_line.group(1) + " " + var_line.group(2))
 758                     out_c.write(", jobject " + var_line.group(2))
 759             out_java.write(");\n")
 760             out_c.write(") {\n")
 761
 762             out_c.write("\tjclass c = (*env)->GetObjectClass(env, o);\n")
 763             out_c.write("\tDO_ASSERT(c != NULL);\n")
 764             out_c.write("\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n")
 765             out_c.write("\tatomic_init(&calls->refcnt, 1);\n")
 766             out_c.write("\tDO_ASSERT((*env)->GetJavaVM(env, &calls->vm) == 0);\n")
 767             out_c.write("\tcalls->o = (*env)->NewWeakGlobalRef(env, o);\n")
 768             for (fn_line, java_meth_descr) in zip(trait_fn_lines, java_meths):
 769                 if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
 770                     out_c.write("\tcalls->" + fn_line.group(2) + "_meth = (*env)->GetMethodID(env, c, \"" + fn_line.group(2) + "\", \"" + java_meth_descr + "\");\n")
 771                     out_c.write("\tDO_ASSERT(calls->" + fn_line.group(2) + "_meth != NULL);\n")
 772             out_c.write("\n\t" + struct_name + " ret = {\n")
 773             out_c.write("\t\t.this_arg = (void*) calls,\n")
 774             for fn_line in trait_fn_lines:
 775                 if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
 776                     out_c.write("\t\t." + fn_line.group(2) + " = " + fn_line.group(2) + "_jcall,\n")
 777                 elif fn_line.group(2) == "free":
 778                     out_c.write("\t\t.free = " + struct_name + "_JCalls_free,\n")
 779                 else:
 780                     out_c.write("\t\t.clone = " + struct_name + "_JCalls_clone,\n")
 781             for var_line in field_var_lines:
 782                 if var_line.group(1) in trait_structs:
 783                     out_c.write("\t\t." + var_line.group(2) + " = " + var_line.group(1) + "_init(env, _a, " + var_line.group(2) + "),\n")
 784             out_c.write("\t};\n")
 785             for var_line in field_var_lines:
 786                 if var_line.group(1) in trait_structs:
 787                     out_c.write("\tcalls->" + var_line.group(2) + " = ret." + var_line.group(2) + ".this_arg;\n")
 788             out_c.write("\treturn ret;\n")
 789             out_c.write("}\n")
 790
 791             out_c.write("JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1new (JNIEnv * env, jclass _a, jobject o")
 792             for var_line in field_var_lines:
 793                 if var_line.group(1) in trait_structs:
 794                     out_c.write(", jobject " + var_line.group(2))
 795             out_c.write(") {\n")
 796             out_c.write("\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n")
 797             out_c.write("\t*res_ptr = " + struct_name + "_init(env, _a, o")
 798             for var_line in field_var_lines:
 799                 if var_line.group(1) in trait_structs:
 800                     out_c.write(", " + var_line.group(2))
 801             out_c.write(");\n")
 802             out_c.write("\treturn (long)res_ptr;\n")
 803             out_c.write("}\n")
 804
 805             out_java.write("\tpublic static native " + struct_name + " " + struct_name + "_get_obj_from_jcalls(long val);\n")
 806             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")
 807             out_c.write("\tjobject ret = (*env)->NewLocalRef(env, ((" + struct_name + "_JCalls*)val)->o);\n")
 808             out_c.write("\tDO_ASSERT(ret != NULL);\n")
 809             out_c.write("\treturn ret;\n")
 810             out_c.write("}\n")
 811
 812         for fn_line in trait_fn_lines:
 813             # For now, just disable enabling the _call_log - we don't know how to inverse-map String
 814             is_log = fn_line.group(2) == "log" and struct_name == "LDKLogger"
 815             if fn_line.group(2) != "free" and fn_line.group(2) != "clone" and fn_line.group(2) != "eq" and not is_log:
 816                 dummy_line = fn_line.group(1) + struct_name.replace("LDK", "") + "_call_" + fn_line.group(2) + " " + struct_name + "* this_arg" + fn_line.group(4) + "\n"
 817                 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")
 818
 819     out_c.write("""#include \"org_ldk_impl_bindings.h\"
 820 #include <rust_types.h>
 821 #include <lightning.h>
 822 #include <string.h>
 823 #include <stdatomic.h>
 824 """)
 825
 826     if sys.argv[4] == "false":
 827         out_c.write("#define MALLOC(a, _) malloc(a)\n")
 828         out_c.write("#define FREE free\n")
 829         out_c.write("#define DO_ASSERT(a) (void)(a)\n")
 830     else:
 831         out_c.write("""#include <assert.h>
 832 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
 833
 834 // Running a leak check across all the allocations and frees of the JDK is a mess,
 835 // so instead we implement our own naive leak checker here, relying on the -wrap
 836 // linker option to wrap malloc/calloc/realloc/free, tracking everyhing allocated
 837 // and free'd in Rust or C across the generated bindings shared library.
 838 #include <threads.h>
 839 #include <execinfo.h>
 840 #include <unistd.h>
 841 static mtx_t allocation_mtx;
 842
 843 void __attribute__((constructor)) init_mtx() {
 844         DO_ASSERT(mtx_init(&allocation_mtx, mtx_plain) == thrd_success);
 845 }
 846
 847 #define BT_MAX 128
 848 typedef struct allocation {
 849         struct allocation* next;
 850         void* ptr;
 851         const char* struct_name;
 852         void* bt[BT_MAX];
 853         int bt_len;
 854 } allocation;
 855 static allocation* allocation_ll = NULL;
 856
 857 void* __real_malloc(size_t len);
 858 void* __real_calloc(size_t nmemb, size_t len);
 859 static void new_allocation(void* res, const char* struct_name) {
 860         allocation* new_alloc = __real_malloc(sizeof(allocation));
 861         new_alloc->ptr = res;
 862         new_alloc->struct_name = struct_name;
 863         new_alloc->bt_len = backtrace(new_alloc->bt, BT_MAX);
 864         DO_ASSERT(mtx_lock(&allocation_mtx) == thrd_success);
 865         new_alloc->next = allocation_ll;
 866         allocation_ll = new_alloc;
 867         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
 868 }
 869 static void* MALLOC(size_t len, const char* struct_name) {
 870         void* res = __real_malloc(len);
 871         new_allocation(res, struct_name);
 872         return res;
 873 }
 874 void __real_free(void* ptr);
 875 static void alloc_freed(void* ptr) {
 876         allocation* p = NULL;
 877         DO_ASSERT(mtx_lock(&allocation_mtx) == thrd_success);
 878         allocation* it = allocation_ll;
 879         while (it->ptr != ptr) { p = it; it = it->next; }
 880         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
 881         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
 882         DO_ASSERT(it->ptr == ptr);
 883         __real_free(it);
 884 }
 885 static void FREE(void* ptr) {
 886         alloc_freed(ptr);
 887         __real_free(ptr);
 888 }
 889
 890 void* __wrap_malloc(size_t len) {
 891         void* res = __real_malloc(len);
 892         new_allocation(res, "malloc call");
 893         return res;
 894 }
 895 void* __wrap_calloc(size_t nmemb, size_t len) {
 896         void* res = __real_calloc(nmemb, len);
 897         new_allocation(res, "calloc call");
 898         return res;
 899 }
 900 void __wrap_free(void* ptr) {
 901         alloc_freed(ptr);
 902         __real_free(ptr);
 903 }
 904
 905 void* __real_realloc(void* ptr, size_t newlen);
 906 void* __wrap_realloc(void* ptr, size_t len) {
 907         alloc_freed(ptr);
 908         void* res = __real_realloc(ptr, len);
 909         new_allocation(res, "realloc call");
 910         return res;
 911 }
 912 void __wrap_reallocarray(void* ptr, size_t new_sz) {
 913         // Rust doesn't seem to use reallocarray currently
 914         assert(false);
 915 }
 916
 917 void __attribute__((destructor)) check_leaks() {
 918         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 919                 fprintf(stderr, "%s %p remains:\\n", a->struct_name, a->ptr);
 920                 backtrace_symbols_fd(a->bt, a->bt_len, STDERR_FILENO);
 921                 fprintf(stderr, "\\n\\n");
 922         }
 923         DO_ASSERT(allocation_ll == NULL);
 924 }
 925 """)
 926     out_java.write("""package org.ldk.impl;
 927 import org.ldk.enums.*;
 928
 929 public class bindings {
 930         public static class VecOrSliceDef {
 931                 public long dataptr;
 932                 public long datalen;
 933                 public long stride;
 934                 public VecOrSliceDef(long dataptr, long datalen, long stride) {
 935                         this.dataptr = dataptr; this.datalen = datalen; this.stride = stride;
 936                 }
 937         }
 938         static {
 939                 System.loadLibrary(\"lightningjni\");
 940                 init(java.lang.Enum.class, VecOrSliceDef.class);
 941         }
 942         static native void init(java.lang.Class c, java.lang.Class slicedef);
 943
 944         public static native boolean deref_bool(long ptr);
 945         public static native long deref_long(long ptr);
 946         public static native void free_heap_ptr(long ptr);
 947         public static native byte[] read_bytes(long ptr, long len);
 948         public static native byte[] get_u8_slice_bytes(long slice_ptr);
 949         public static native long bytes_to_u8_vec(byte[] bytes);
 950         public static native long new_txpointer_copy_data(byte[] txdata);
 951         public static native long vec_slice_len(long vec);
 952         public static native long new_empty_slice_vec();
 953
 954 """)
 955     out_c.write("""
 956 static jmethodID ordinal_meth = NULL;
 957 static jmethodID slicedef_meth = NULL;
 958 static jclass slicedef_cls = NULL;
 959 JNIEXPORT void Java_org_ldk_impl_bindings_init(JNIEnv * env, jclass _b, jclass enum_class, jclass slicedef_class) {
 960         ordinal_meth = (*env)->GetMethodID(env, enum_class, "ordinal", "()I");
 961         DO_ASSERT(ordinal_meth != NULL);
 962         slicedef_meth = (*env)->GetMethodID(env, slicedef_class, "<init>", "(JJJ)V");
 963         DO_ASSERT(slicedef_meth != NULL);
 964         slicedef_cls = (*env)->NewGlobalRef(env, slicedef_class);
 965         DO_ASSERT(slicedef_cls != NULL);
 966 }
 967
 968 JNIEXPORT jboolean JNICALL Java_org_ldk_impl_bindings_deref_1bool (JNIEnv * env, jclass _a, jlong ptr) {
 969         return *((bool*)ptr);
 970 }
 971 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_deref_1long (JNIEnv * env, jclass _a, jlong ptr) {
 972         return *((long*)ptr);
 973 }
 974 JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_free_1heap_1ptr (JNIEnv * env, jclass _a, jlong ptr) {
 975         FREE((void*)ptr);
 976 }
 977 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_read_1bytes (JNIEnv * _env, jclass _b, jlong ptr, jlong len) {
 978         jbyteArray ret_arr = (*_env)->NewByteArray(_env, len);
 979         (*_env)->SetByteArrayRegion(_env, ret_arr, 0, len, (unsigned char*)ptr);
 980         return ret_arr;
 981 }
 982 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_get_1u8_1slice_1bytes (JNIEnv * _env, jclass _b, jlong slice_ptr) {
 983         LDKu8slice *slice = (LDKu8slice*)slice_ptr;
 984         jbyteArray ret_arr = (*_env)->NewByteArray(_env, slice->datalen);
 985         (*_env)->SetByteArrayRegion(_env, ret_arr, 0, slice->datalen, slice->data);
 986         return ret_arr;
 987 }
 988 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_bytes_1to_1u8_1vec (JNIEnv * _env, jclass _b, jbyteArray bytes) {
 989         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "LDKCVec_u8");
 990         vec->datalen = (*_env)->GetArrayLength(_env, bytes);
 991         vec->data = (uint8_t*)MALLOC(vec->datalen, "LDKCVec_u8Z Bytes");
 992         (*_env)->GetByteArrayRegion (_env, bytes, 0, vec->datalen, vec->data);
 993         return (long)vec;
 994 }
 995 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_new_1txpointer_1copy_1data (JNIEnv * env, jclass _b, jbyteArray bytes) {
 996         LDKTransaction *txdata = (LDKTransaction*)MALLOC(sizeof(LDKTransaction), "LDKTransaction");
 997         txdata->datalen = (*env)->GetArrayLength(env, bytes);
 998         txdata->data = (uint8_t*)MALLOC(txdata->datalen, "Tx Data Bytes");
 999         txdata->data_is_owned = true;
1000         (*env)->GetByteArrayRegion (env, bytes, 0, txdata->datalen, txdata->data);
1001         return (long)txdata;
1002 }
1003 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_vec_1slice_1len (JNIEnv * env, jclass _a, jlong ptr) {
1004         // Check offsets of a few Vec types are all consistent as we're meant to be generic across types
1005         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_SignatureZ, datalen), "Vec<*> needs to be mapped identically");
1006         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_MessageSendEventZ, datalen), "Vec<*> needs to be mapped identically");
1007         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_EventZ, datalen), "Vec<*> needs to be mapped identically");
1008         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_C2Tuple_usizeTransactionZZ, datalen), "Vec<*> needs to be mapped identically");
1009         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)ptr;
1010         return (long)vec->datalen;
1011 }
1012 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_new_1empty_1slice_1vec (JNIEnv * _env, jclass _b) {
1013         // Check sizes of a few Vec types are all consistent as we're meant to be generic across types
1014         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_SignatureZ), "Vec<*> needs to be mapped identically");
1015         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_MessageSendEventZ), "Vec<*> needs to be mapped identically");
1016         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_EventZ), "Vec<*> needs to be mapped identically");
1017         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_C2Tuple_usizeTransactionZZ), "Vec<*> needs to be mapped identically");
1018         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "Empty LDKCVec");
1019         vec->data = NULL;
1020         vec->datalen = 0;
1021         return (long)vec;
1022 }
1023
1024 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
1025 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
1026 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
1027 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
1028
1029 """)
1030
1031     with open(sys.argv[3] + "/structs/CommonBase.java", "a") as out_java_struct:
1032         out_java_struct.write("""package org.ldk.structs;
1033 import java.util.LinkedList;
1034 class CommonBase {
1035         final long ptr;
1036         LinkedList<Object> ptrs_to = new LinkedList();
1037         protected CommonBase(long ptr) { this.ptr = ptr; }
1038         public long _test_only_get_ptr() { return this.ptr; }
1039 }
1040 """)
1041
1042     in_block_comment = False
1043     cur_block_obj = None
1044
1045     const_val_regex = re.compile("^extern const ([A-Za-z_0-9]*) ([A-Za-z_0-9]*);$")
1046
1047     line_indicates_result_regex = re.compile("^   (LDKCResultPtr_[A-Za-z_0-9]*) contents;$")
1048     line_indicates_vec_regex = re.compile("^   ([A-Za-z_0-9]*) \*data;$")
1049     line_indicates_opaque_regex = re.compile("^   bool is_owned;$")
1050     line_indicates_trait_regex = re.compile("^   ([A-Za-z_0-9]* \*?)\(\*([A-Za-z_0-9]*)\)\((const )?void \*this_arg(.*)\);$")
1051     assert(line_indicates_trait_regex.match("   uintptr_t (*send_data)(void *this_arg, LDKu8slice data, bool resume_read);"))
1052     assert(line_indicates_trait_regex.match("   LDKCVec_MessageSendEventZ (*get_and_clear_pending_msg_events)(const void *this_arg);"))
1053     assert(line_indicates_trait_regex.match("   void *(*clone)(const void *this_arg);"))
1054     line_field_var_regex = re.compile("^   ([A-Za-z_0-9]*) ([A-Za-z_0-9]*);$")
1055     assert(line_field_var_regex.match("   LDKMessageSendEventsProvider MessageSendEventsProvider;"))
1056     struct_name_regex = re.compile("^typedef (struct|enum|union) (MUST_USE_STRUCT )?(LDK[A-Za-z_0-9]*) {$")
1057     assert(struct_name_regex.match("typedef struct LDKCVecTempl_u8 {"))
1058     assert(struct_name_regex.match("typedef enum LDKNetwork {"))
1059     struct_alias_regex = re.compile("^typedef (LDK[A-Za-z_0-9]*) (LDK[A-Za-z_0-9]*);$")
1060     assert(struct_alias_regex.match("typedef LDKCResultTempl_bool__PeerHandleError LDKCResult_boolPeerHandleErrorZ;"))
1061
1062     result_templ_structs = set()
1063     union_enum_items = {}
1064     result_ptr_struct_items = {}
1065     for line in in_h:
1066         if in_block_comment:
1067             if line.endswith("*/\n"):
1068                 in_block_comment = False
1069         elif cur_block_obj is not None:
1070             cur_block_obj  = cur_block_obj + line
1071             if line.startswith("} "):
1072                 field_lines = []
1073                 struct_name = None
1074                 vec_ty = None
1075                 obj_lines = cur_block_obj.split("\n")
1076                 is_opaque = False
1077                 result_contents = None
1078                 is_unitary_enum = False
1079                 is_union_enum = False
1080                 is_union = False
1081                 is_tuple = False
1082                 trait_fn_lines = []
1083                 field_var_lines = []
1084
1085                 for idx, struct_line in enumerate(obj_lines):
1086                     if struct_line.strip().startswith("/*"):
1087                         in_block_comment = True
1088                     if in_block_comment:
1089                         if struct_line.endswith("*/"):
1090                             in_block_comment = False
1091                     else:
1092                         struct_name_match = struct_name_regex.match(struct_line)
1093                         if struct_name_match is not None:
1094                             struct_name = struct_name_match.group(3)
1095                             if struct_name_match.group(1) == "enum":
1096                                 if not struct_name.endswith("_Tag"):
1097                                     is_unitary_enum = True
1098                                 else:
1099                                     is_union_enum = True
1100                             elif struct_name_match.group(1) == "union":
1101                                 is_union = True
1102                         if line_indicates_opaque_regex.match(struct_line):
1103                             is_opaque = True
1104                         result_match = line_indicates_result_regex.match(struct_line)
1105                         if result_match is not None:
1106                             result_contents = result_match.group(1)
1107                         vec_ty_match = line_indicates_vec_regex.match(struct_line)
1108                         if vec_ty_match is not None and struct_name.startswith("LDKCVecTempl_"):
1109                             vec_ty = vec_ty_match.group(1)
1110                         elif struct_name.startswith("LDKC2TupleTempl_") or struct_name.startswith("LDKC3TupleTempl_"):
1111                             is_tuple = True
1112                         trait_fn_match = line_indicates_trait_regex.match(struct_line)
1113                         if trait_fn_match is not None:
1114                             trait_fn_lines.append(trait_fn_match)
1115                         field_var_match = line_field_var_regex.match(struct_line)
1116                         if field_var_match is not None:
1117                             field_var_lines.append(field_var_match)
1118                         field_lines.append(struct_line)
1119
1120                 assert(struct_name is not None)
1121                 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))
1122                 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))
1123                 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))
1124                 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))
1125                 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))
1126                 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))
1127                 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))
1128
1129                 if is_opaque:
1130                     opaque_structs.add(struct_name)
1131                     with open(sys.argv[3] + "/structs/" + struct_name.replace("LDK","") + ".java", "w") as out_java_struct:
1132                         out_java_struct.write("package org.ldk.structs;\n\n")
1133                         out_java_struct.write("import org.ldk.impl.bindings;\n")
1134                         out_java_struct.write("import org.ldk.enums.*;\n\n")
1135                         out_java_struct.write("public class " + struct_name.replace("LDK","") + " extends CommonBase {\n")
1136                         out_java_struct.write("\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); }\n")
1137                         out_java_struct.write("\t@Override @SuppressWarnings(\"deprecation\")\n")
1138                         out_java_struct.write("\tprotected void finalize() throws Throwable {\n")
1139                         out_java_struct.write("\t\tbindings." + struct_name.replace("LDK","") + "_free(ptr); super.finalize();\n")
1140                         out_java_struct.write("\t}\n\n")
1141                 elif result_contents is not None:
1142                     result_templ_structs.add(struct_name)
1143                     assert result_contents in result_ptr_struct_items
1144                 elif struct_name.startswith("LDKCResultPtr_"):
1145                     for line in field_lines:
1146                         if line.endswith("*result;"):
1147                             res_ty = line[:-8].strip()
1148                         elif line.endswith("*err;"):
1149                             err_ty = line[:-5].strip()
1150                     result_ptr_struct_items[struct_name] = (res_ty, err_ty)
1151                 elif is_tuple:
1152                     out_java.write("\tpublic static native long " + struct_name + "_new(")
1153                     out_c.write("JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1new(JNIEnv *_env, jclass _b")
1154                     for idx, line in enumerate(field_lines):
1155                         if idx != 0 and idx < len(field_lines) - 2:
1156                             ty_info = java_c_types(line.strip(';'), None)
1157                             if idx != 1:
1158                                 out_java.write(", ")
1159                             e = chr(ord('a') + idx - 1)
1160                             out_java.write(ty_info.java_ty + " " + e)
1161                             out_c.write(", " + ty_info.c_ty + " " + e)
1162                     out_java.write(");\n")
1163                     out_c.write(") {\n")
1164                     out_c.write("\t" + struct_name + "* ret = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n")
1165                     for idx, line in enumerate(field_lines):
1166                         if idx != 0 and idx < len(field_lines) - 2:
1167                             ty_info = map_type(line.strip(';'), False, None, False)
1168                             e = chr(ord('a') + idx - 1)
1169                             if ty_info.arg_conv is not None:
1170                                 out_c.write("\t" + ty_info.arg_conv.replace("\n", "\n\t"))
1171                                 out_c.write("\n\tret->" + e + " = " + ty_info.arg_conv_name + ";\n")
1172                             else:
1173                                 out_c.write("\tret->" + e + " = " + e + ";\n")
1174                     out_c.write("\treturn (long)ret;\n")
1175                     out_c.write("}\n")
1176                 elif vec_ty is not None:
1177                     if vec_ty in opaque_structs:
1178                         out_java.write("\tpublic static native long[] " + struct_name + "_arr_info(long vec_ptr);\n")
1179                         out_c.write("JNIEXPORT jlongArray JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1arr_1info(JNIEnv *env, jclass _b, jlong ptr) {\n")
1180                     else:
1181                         out_java.write("\tpublic static native VecOrSliceDef " + struct_name + "_arr_info(long vec_ptr);\n")
1182                         out_c.write("JNIEXPORT jobject JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1arr_1info(JNIEnv *env, jclass _b, jlong ptr) {\n")
1183                     out_c.write("\t" + struct_name + " *vec = (" + struct_name + "*)ptr;\n")
1184                     if vec_ty in opaque_structs:
1185                         out_c.write("\tjlongArray ret = (*env)->NewLongArray(env, vec->datalen);\n")
1186                         out_c.write("\tjlong *ret_elems = (*env)->GetPrimitiveArrayCritical(env, ret, NULL);\n")
1187                         out_c.write("\tfor (size_t i = 0; i < vec->datalen; i++) {\n")
1188                         out_c.write("\t\tDO_ASSERT((((long)vec->data[i].inner) & 1) == 0);\n")
1189                         out_c.write("\t\tret_elems[i] = (long)vec->data[i].inner | (vec->data[i].is_owned ? 1 : 0);\n")
1190                         out_c.write("\t}\n")
1191                         out_c.write("\t(*env)->ReleasePrimitiveArrayCritical(env, ret, ret_elems, 0);\n")
1192                         out_c.write("\treturn ret;\n")
1193                     else:
1194                         out_c.write("\treturn (*env)->NewObject(env, slicedef_cls, slicedef_meth, (long)vec->data, (long)vec->datalen, sizeof(" + vec_ty + "));\n")
1195                     out_c.write("}\n")
1196
1197                     ty_info = map_type(vec_ty + " arr_elem", False, None, False)
1198                     if len(ty_info.java_fn_ty_arg) == 1: # ie we're a primitive of some form
1199                         out_java.write("\tpublic static native long " + struct_name + "_new(" + ty_info.java_ty + "[] elems);\n")
1200                         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")
1201                         out_c.write("\t" + struct_name + " *ret = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n")
1202                         out_c.write("\tret->datalen = (*env)->GetArrayLength(env, elems);\n")
1203                         out_c.write("\tif (ret->datalen == 0) {\n")
1204                         out_c.write("\t\tret->data = NULL;\n")
1205                         out_c.write("\t} else {\n")
1206                         out_c.write("\t\tret->data = MALLOC(sizeof(" + vec_ty + ") * ret->datalen, \"" + struct_name + " Data\");\n")
1207                         out_c.write("\t\t" + ty_info.c_ty + " *java_elems = (*env)->GetPrimitiveArrayCritical(env, elems, NULL);\n")
1208                         out_c.write("\t\tfor (size_t i = 0; i < ret->datalen; i++) {\n")
1209                         if ty_info.arg_conv is not None:
1210                             out_c.write("\t\t\t" + ty_info.c_ty + " arr_elem = java_elems[i];\n")
1211                             out_c.write("\t\t\t" + ty_info.arg_conv.replace("\n", "\n\t\t\t") + "\n")
1212                             out_c.write("\t\t\tret->data[i] = " + ty_info.arg_conv_name + ";\n")
1213                         else:
1214                             out_c.write("\t\t\tret->data[i] = java_elems[i];\n")
1215                         out_c.write("\t\t}\n")
1216                         out_c.write("\t\t(*env)->ReleasePrimitiveArrayCritical(env, elems, java_elems, 0);\n")
1217                         out_c.write("\t}\n")
1218                         out_c.write("\treturn (long)ret;\n")
1219                         out_c.write("}\n")
1220                 elif is_union_enum:
1221                     assert(struct_name.endswith("_Tag"))
1222                     struct_name = struct_name[:-4]
1223                     union_enum_items[struct_name] = {"field_lines": field_lines}
1224                 elif struct_name.endswith("_Body") and struct_name.split("_")[0] in union_enum_items:
1225                     enum_var_name = struct_name.split("_")
1226                     union_enum_items[enum_var_name[0]][enum_var_name[1]] = field_lines
1227                 elif struct_name in union_enum_items:
1228                     map_complex_enum(struct_name, union_enum_items[struct_name])
1229                 elif is_unitary_enum:
1230                     map_unitary_enum(struct_name, field_lines)
1231                 elif len(trait_fn_lines) > 0:
1232                     trait_structs.add(struct_name)
1233                     map_trait(struct_name, field_var_lines, trait_fn_lines)
1234                 cur_block_obj = None
1235         else:
1236             fn_ptr = fn_ptr_regex.match(line)
1237             fn_ret_arr = fn_ret_arr_regex.match(line)
1238             reg_fn = reg_fn_regex.match(line)
1239             const_val = const_val_regex.match(line)
1240
1241             if line.startswith("#include <"):
1242                 pass
1243             elif line.startswith("/*"):
1244                 #out_java.write("\t" + line)
1245                 if not line.endswith("*/\n"):
1246                     in_block_comment = True
1247             elif line.startswith("typedef enum "):
1248                 cur_block_obj = line
1249             elif line.startswith("typedef struct "):
1250                 cur_block_obj = line
1251             elif line.startswith("typedef union "):
1252                 cur_block_obj = line
1253             elif line.startswith("typedef "):
1254                 alias_match =  struct_alias_regex.match(line)
1255                 if alias_match.group(1) in result_templ_structs:
1256                     out_java.write("\tpublic static native boolean " + alias_match.group(2) + "_result_ok(long arg);\n")
1257                     out_java.write("\tpublic static native long " + alias_match.group(2) + "_get_inner(long arg);\n")
1258                     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")
1259                     out_c.write("\treturn ((" + alias_match.group(2) + "*)arg)->result_ok;\n")
1260                     out_c.write("}\n")
1261                     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")
1262                     contents_ty = alias_match.group(1).replace("LDKCResultTempl", "LDKCResultPtr")
1263                     res_ty, err_ty = result_ptr_struct_items[contents_ty]
1264                     out_c.write("\t" + alias_match.group(2) + " *val = (" + alias_match.group(2) + "*)arg;\n")
1265                     out_c.write("\tif (val->result_ok) {\n")
1266                     if res_ty not in opaque_structs:
1267                         out_c.write("\t\treturn (long)val->contents.result;\n")
1268                     else:
1269                         out_c.write("\t\treturn (long)(val->contents.result->inner) | (val->contents.result->is_owned ? 1 : 0);\n")
1270                     out_c.write("\t} else {\n")
1271                     if err_ty not in opaque_structs:
1272                         out_c.write("\t\treturn (long)val->contents.err;\n")
1273                     else:
1274                         out_c.write("\t\treturn (long)(val->contents.err->inner) | (val->contents.err->is_owned ? 1 : 0);\n")
1275                     out_c.write("\t}\n}\n")
1276                 pass
1277             elif fn_ptr is not None:
1278                 map_fn(line, fn_ptr, None, None)
1279             elif fn_ret_arr is not None:
1280                 map_fn(line, fn_ret_arr, fn_ret_arr.group(4), None)
1281             elif reg_fn is not None:
1282                 map_fn(line, reg_fn, None, None)
1283             elif const_val_regex is not None:
1284                 # TODO Map const variables
1285                 pass
1286             else:
1287                 assert(line == "\n")
1288
1289     out_java.write("}\n")
1290     for struct_name in opaque_structs:
1291         with open(sys.argv[3] + "/structs/" + struct_name.replace("LDK","") + ".java", "a") as out_java_struct:
1292             out_java_struct.write("}\n")
1293     for struct_name in trait_structs:
1294         with open(sys.argv[3] + "/structs/" + struct_name.replace("LDK","") + ".java", "a") as out_java_struct:
1295             out_java_struct.write("}\n")