_ 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         if fn_arg.startswith("LDKThreeBytes"):
 132             fn_arg = "uint8_t (*" + fn_arg[14:] + ")[3]"
 133             assert var_is_arr_regex.match(fn_arg[8:])
 134             rust_obj = "LDKThreeBytes"
 135             arr_access = "data"
 136
 137         if fn_arg.startswith("void"):
 138             java_ty = "void"
 139             c_ty = "void"
 140             fn_ty_arg = "V"
 141             fn_arg = fn_arg[4:].strip()
 142         elif fn_arg.startswith("bool"):
 143             java_ty = "boolean"
 144             c_ty = "jboolean"
 145             fn_ty_arg = "Z"
 146             fn_arg = fn_arg[4:].strip()
 147         elif fn_arg.startswith("uint8_t"):
 148             java_ty = "byte"
 149             c_ty = "jbyte"
 150             fn_ty_arg = "B"
 151             fn_arg = fn_arg[7:].strip()
 152         elif fn_arg.startswith("uint16_t"):
 153             java_ty = "short"
 154             c_ty = "jshort"
 155             fn_ty_arg = "S"
 156             fn_arg = fn_arg[8:].strip()
 157         elif fn_arg.startswith("uint32_t"):
 158             java_ty = "int"
 159             c_ty = "jint"
 160             fn_ty_arg = "I"
 161             fn_arg = fn_arg[8:].strip()
 162         elif fn_arg.startswith("uint64_t") or fn_arg.startswith("uintptr_t"):
 163             java_ty = "long"
 164             c_ty = "jlong"
 165             fn_ty_arg = "J"
 166             if fn_arg.startswith("uint64_t"):
 167                 fn_arg = fn_arg[8:].strip()
 168             else:
 169                 fn_arg = fn_arg[9:].strip()
 170         elif is_const and fn_arg.startswith("char *"):
 171             java_ty = "String"
 172             c_ty = "const char*"
 173             fn_ty_arg = "Ljava/lang/String;"
 174             fn_arg = fn_arg[6:].strip()
 175         else:
 176             ma = var_ty_regex.match(fn_arg)
 177             if ma.group(1).strip() in unitary_enums:
 178                 java_ty = ma.group(1).strip()
 179                 c_ty = "jclass"
 180                 fn_ty_arg = "Lorg/ldk/enums/" + ma.group(1).strip() + ";"
 181                 fn_arg = ma.group(2).strip()
 182                 rust_obj = ma.group(1).strip()
 183                 take_by_ptr = True
 184             else:
 185                 java_ty = "long"
 186                 c_ty = "jlong"
 187                 fn_ty_arg = "J"
 188                 fn_arg = ma.group(2).strip()
 189                 rust_obj = ma.group(1).strip()
 190                 take_by_ptr = True
 191
 192         if fn_arg.startswith(" *") or fn_arg.startswith("*"):
 193             fn_arg = fn_arg.replace("*", "").strip()
 194             is_ptr = True
 195             c_ty = "jlong"
 196             java_ty = "long"
 197             fn_ty_arg = "J"
 198
 199         var_is_arr = var_is_arr_regex.match(fn_arg)
 200         if var_is_arr is not None or ret_arr_len is not None:
 201             assert(not take_by_ptr)
 202             assert(not is_ptr)
 203             java_ty = java_ty + "[]"
 204             c_ty = c_ty + "Array"
 205             if var_is_arr is not None:
 206                 if var_is_arr.group(1) == "":
 207                     return TypeInfo(rust_obj=rust_obj, java_ty=java_ty, java_fn_ty_arg="[" + fn_ty_arg, c_ty=c_ty,
 208                         passed_as_ptr=False, is_ptr=False, var_name="arg", arr_len=var_is_arr.group(2), arr_access=arr_access)
 209                 return TypeInfo(rust_obj=rust_obj, java_ty=java_ty, java_fn_ty_arg="[" + fn_ty_arg, c_ty=c_ty,
 210                     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)
 211         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,
 212             is_ptr=is_ptr, var_name=fn_arg, arr_len=None, arr_access=None)
 213
 214     def map_type(fn_arg, print_void, ret_arr_len, is_free):
 215         ty_info = java_c_types(fn_arg, ret_arr_len)
 216
 217         if ty_info.c_ty == "void":
 218             if not print_void:
 219                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 220                     arg_conv = None, arg_conv_name = None, ret_conv = None, ret_conv_name = None)
 221
 222         if ty_info.c_ty.endswith("Array"):
 223             arr_len = ty_info.arr_len
 224             if arr_len is not None:
 225                 arr_name = ty_info.var_name
 226             else:
 227                 arr_name = "ret"
 228                 arr_len = ret_arr_len
 229             assert(ty_info.c_ty == "jbyteArray")
 230             if ty_info.rust_obj is not None:
 231                 arg_conv = ty_info.rust_obj + " " + arr_name + "_ref;\n"
 232                 arg_conv = arg_conv + "CHECK((*_env)->GetArrayLength (_env, " + arr_name + ") == " + arr_len + ");\n"
 233                 arg_conv = arg_conv + "(*_env)->GetByteArrayRegion (_env, " + arr_name + ", 0, " + arr_len + ", " + arr_name + "_ref." + ty_info.arr_access + ");"
 234                 arr_access = ("", "." + ty_info.arr_access)
 235             else:
 236                 arg_conv = "unsigned char " + arr_name + "_arr[" + arr_len + "];\n"
 237                 arg_conv = arg_conv + "CHECK((*_env)->GetArrayLength (_env, " + arr_name + ") == " + arr_len + ");\n"
 238                 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;"
 239                 arr_access = ("*", "")
 240             return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 241                 arg_conv = arg_conv,
 242                 arg_conv_name = arr_name + "_ref",
 243                 ret_conv = ("jbyteArray " + arr_name + "_arr = (*_env)->NewByteArray(_env, " + arr_len + ");\n" +
 244                     "(*_env)->SetByteArrayRegion(_env, " + arr_name + "_arr, 0, " + arr_len + ", " + arr_access[0],
 245                     arr_access[1] + ");"),
 246                 ret_conv_name = arr_name + "_arr")
 247         elif ty_info.var_name != "":
 248             # If we have a parameter name, print it (noting that it may indicate its a pointer)
 249             if ty_info.rust_obj is not None:
 250                 assert(ty_info.passed_as_ptr)
 251                 opaque_arg_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv;\n"
 252                 opaque_arg_conv = opaque_arg_conv + ty_info.var_name + "_conv.inner = (void*)(" + ty_info.var_name + " & (~1));\n"
 253                 opaque_arg_conv = opaque_arg_conv + ty_info.var_name + "_conv.is_owned = (" + ty_info.var_name + " & 1) || (" + ty_info.var_name + " == 0);"
 254                 if not ty_info.is_ptr and not is_free:
 255                     if (ty_info.rust_obj.replace("LDK", "") + "_clone") in clone_fns:
 256                         # 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.
 257                         opaque_arg_conv = opaque_arg_conv + "\nif (" + ty_info.var_name + "_conv.inner != NULL)\n"
 258                         opaque_arg_conv = opaque_arg_conv + "\t" + ty_info.var_name + "_conv = " + ty_info.rust_obj.replace("LDK", "") + "_clone(&" + ty_info.var_name + "_conv);"
 259                     elif ty_info.passed_as_ptr:
 260                         opaque_arg_conv = opaque_arg_conv + "\n// Warning: we may need a move here but can't clone!"
 261                 if not ty_info.is_ptr:
 262                     if ty_info.rust_obj in unitary_enums:
 263                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 264                             arg_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv = " + ty_info.rust_obj + "_from_java(_env, " + ty_info.var_name + ");",
 265                             arg_conv_name = ty_info.var_name + "_conv",
 266                             ret_conv = ("jclass " + ty_info.var_name + "_conv = " + ty_info.rust_obj + "_to_java(_env, ", ");"),
 267                             ret_conv_name = ty_info.var_name + "_conv")
 268                     if ty_info.rust_obj in opaque_structs:
 269                         ret_conv_suf = ";\nCHECK((((long)" + ty_info.var_name + "_var.inner) & 1) == 0); // We rely on a free low bit, malloc guarantees this.\n"
 270                         ret_conv_suf = ret_conv_suf + "CHECK((((long)&" + ty_info.var_name + "_var) & 1) == 0); // We rely on a free low bit, pointer alignment guarantees this.\n"
 271                         ret_conv_suf = ret_conv_suf + "long " + ty_info.var_name + "_ref;\n"
 272                         ret_conv_suf = ret_conv_suf + "if (" + ty_info.var_name + "_var.is_owned) {\n"
 273                         ret_conv_suf = ret_conv_suf + "\t" + ty_info.var_name + "_ref = (long)" + ty_info.var_name + "_var.inner | 1;\n"
 274                         ret_conv_suf = ret_conv_suf + "} else {\n"
 275                         ret_conv_suf = ret_conv_suf + "\t" + ty_info.var_name + "_ref = (long)&" + ty_info.var_name + "_var;\n"
 276                         ret_conv_suf = ret_conv_suf + "}"
 277                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 278                             arg_conv = opaque_arg_conv, arg_conv_name = ty_info.var_name + "_conv",
 279                             ret_conv = (ty_info.rust_obj + " " + ty_info.var_name + "_var = ", ret_conv_suf),
 280                             ret_conv_name = ty_info.var_name + "_ref")
 281                     base_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv = *(" + ty_info.rust_obj + "*)" + ty_info.var_name + ";";
 282                     if ty_info.rust_obj in trait_structs:
 283                         if not is_free:
 284                             base_conv = base_conv + "\nif (" + ty_info.var_name + "_conv.free == " + ty_info.rust_obj + "_JCalls_free) {\n"
 285                             base_conv = base_conv + "\t// If this_arg is a JCalls struct, then we need to increment the refcnt in it.\n"
 286                             base_conv = base_conv + "\t" + ty_info.rust_obj + "_JCalls_clone(" + ty_info.var_name + "_conv.this_arg);\n}"
 287                         else:
 288                             base_conv = base_conv + "\n" + "FREE((void*)" + ty_info.var_name + ");"
 289                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 290                             arg_conv = base_conv,
 291                             arg_conv_name = ty_info.var_name + "_conv",
 292                             ret_conv = ("CANT PASS TRAIT TO Java?", ""), ret_conv_name = "NO CONV POSSIBLE")
 293                     if ty_info.rust_obj != "LDKu8slice":
 294                         # Don't bother free'ing slices passed in - Rust doesn't auto-free the
 295                         # underlying unlike Vecs, and it gives Java more freedom.
 296                         base_conv = base_conv + "\nFREE((void*)" + ty_info.var_name + ");";
 297                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 298                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv",
 299                         ret_conv = ("long " + ty_info.var_name + "_ref = (long)&", ";"), ret_conv_name = ty_info.var_name + "_ref")
 300                 else:
 301                     assert(not is_free)
 302                     if ty_info.rust_obj in opaque_structs:
 303                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 304                             arg_conv = opaque_arg_conv, arg_conv_name = "&" + ty_info.var_name + "_conv",
 305                             ret_conv = None, ret_conv_name = None) # its a pointer, no conv needed
 306                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 307                         arg_conv = ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)" + ty_info.var_name + ";",
 308                         arg_conv_name = ty_info.var_name + "_conv",
 309                         ret_conv = None, ret_conv_name = None) # its a pointer, no conv needed
 310             elif ty_info.is_ptr:
 311                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 312                     arg_conv = None, arg_conv_name = ty_info.var_name, ret_conv = None, ret_conv_name = None)
 313             elif ty_info.java_ty == "String":
 314                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 315                     arg_conv = None, arg_conv_name = None,
 316                     ret_conv = ("jstring " + ty_info.var_name + "_conv = (*_env)->NewStringUTF(_env, ", ");"), ret_conv_name = ty_info.var_name + "_conv")
 317             else:
 318                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 319                     arg_conv = None, arg_conv_name = ty_info.var_name, ret_conv = None, ret_conv_name = None)
 320         elif not print_void:
 321             # We don't have a parameter name, and want one, just call it arg
 322             if ty_info.rust_obj is not None:
 323                 assert(not is_free or ty_info.rust_obj not in opaque_structs);
 324                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 325                     arg_conv = ty_info.rust_obj + " arg_conv = *(" + ty_info.rust_obj + "*)arg;\nFREE((void*)arg);",
 326                     arg_conv_name = "arg_conv",
 327                     ret_conv = None, ret_conv_name = None)
 328             else:
 329                 assert(not is_free)
 330                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 331                     arg_conv = None, arg_conv_name = "arg", ret_conv = None, ret_conv_name = None)
 332         else:
 333             # We don't have a parameter name, and don't want one (cause we're returning)
 334             if ty_info.rust_obj is not None:
 335                 if not ty_info.is_ptr:
 336                     if ty_info.rust_obj in unitary_enums:
 337                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 338                             arg_conv = ty_info.rust_obj + " ret = " + ty_info.rust_obj + "_from_java(_env, " + ty_info.var_name + ");",
 339                             arg_conv_name = "ret",
 340                             ret_conv = ("jclass ret = " + ty_info.rust_obj + "_to_java(_env, ", ");"), ret_conv_name = "ret")
 341                     if ty_info.rust_obj in opaque_structs:
 342                         # If we're returning a newly-allocated struct, we don't want Rust to ever
 343                         # free, instead relying on the Java GC to lose the ref. We undo this in
 344                         # any _free function.
 345                         # To avoid any issues, we first assert that the incoming object is non-ref.
 346                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 347                             ret_conv = (ty_info.rust_obj + " ret = ", ";"),
 348                             ret_conv_name = "((long)ret.inner) | (ret.is_owned ? 1 : 0)",
 349                             arg_conv = None, arg_conv_name = None)
 350                     else:
 351                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 352                             ret_conv = (ty_info.rust_obj + "* ret = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n*ret = ", ";"),
 353                             ret_conv_name = "(long)ret",
 354                             arg_conv = None, arg_conv_name = None)
 355                 else:
 356                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 357                         ret_conv = ("long ret = (long)", ";"), ret_conv_name = "ret",
 358                         arg_conv = None, arg_conv_name = None)
 359             else:
 360                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 361                     arg_conv = None, arg_conv_name = None, ret_conv = None, ret_conv_name = None)
 362
 363     def map_fn(line, re_match, ret_arr_len, c_call_string):
 364         out_java.write("\t// " + line)
 365         out_java.write("\tpublic static native ")
 366         out_c.write("JNIEXPORT ")
 367
 368         is_free = re_match.group(2).endswith("_free")
 369         struct_meth = re_match.group(2).split("_")[0]
 370
 371         ret_info = map_type(re_match.group(1), True, ret_arr_len, False)
 372         ret_info.print_ty()
 373
 374         if ret_info.ret_conv is not None:
 375             ret_conv_pfx, ret_conv_sfx = ret_info.ret_conv
 376
 377         out_java.write(" " + re_match.group(2) + "(")
 378         out_c.write(" JNICALL Java_org_ldk_impl_bindings_" + re_match.group(2).replace('_', '_1') + "(JNIEnv * _env, jclass _b")
 379
 380         arg_names = []
 381         takes_self = False
 382         args_known = not ret_info.passed_as_ptr or ret_info.rust_obj in opaque_structs or ret_info.rust_obj in trait_structs
 383         for idx, arg in enumerate(re_match.group(3).split(',')):
 384             if idx != 0:
 385                 out_java.write(", ")
 386             if arg != "void":
 387                 out_c.write(", ")
 388             arg_conv_info = map_type(arg, False, None, is_free)
 389             if arg_conv_info.c_ty != "void":
 390                 arg_conv_info.print_ty()
 391                 arg_conv_info.print_name()
 392             if arg_conv_info.arg_name == "this_arg":
 393                 takes_self = True
 394             if arg_conv_info.passed_as_ptr and not arg_conv_info.rust_obj in opaque_structs:
 395                 if not arg_conv_info.rust_obj in trait_structs and not arg_conv_info.rust_obj in unitary_enums:
 396                     print(re_match.group(2) + " bad - " + arg_conv_info.rust_obj)
 397                     args_known = False
 398             arg_names.append(arg_conv_info)
 399
 400         out_java_struct = None
 401         if ("LDK" + struct_meth in opaque_structs or "LDK" + struct_meth in trait_structs) and not is_free:
 402             out_java_struct = open(sys.argv[3] + "/structs/" + struct_meth + ".java", "a")
 403             if not args_known:
 404                 out_java_struct.write("\t// Skipped " + re_match.group(2) + "\n")
 405                 out_java_struct.close()
 406                 out_java_struct = None
 407             else:
 408                 out_java_struct.write("\tpublic ")
 409                 meth_n = re_match.group(2)[len(struct_meth) + 1:]
 410                 if ret_info.rust_obj == "LDK" + struct_meth:
 411                     out_java_struct.write(struct_meth + "(")
 412                 elif ret_info.rust_obj in opaque_structs or ret_info.rust_obj in trait_structs:
 413                     out_java_struct.write(ret_info.rust_obj.replace("LDK", "") + " " + meth_n + "(")
 414                 else:
 415                     out_java_struct.write(ret_info.java_ty + " " + meth_n + "(")
 416                 for idx, arg in enumerate(arg_names):
 417                     if idx != 0:
 418                         if not takes_self or idx > 1:
 419                             out_java_struct.write(", ")
 420                     if arg.java_ty != "void" and arg.arg_name != "this_arg":
 421                         if arg.passed_as_ptr:
 422                             if arg.rust_obj in opaque_structs or arg.rust_obj in trait_structs:
 423                                 out_java_struct.write(arg.rust_obj.replace("LDK", "") + " " + arg.arg_name)
 424                             else:
 425                                 out_java_struct.write(arg.rust_obj + " " + arg.arg_name)
 426                         else:
 427                             out_java_struct.write(arg.java_ty + " " + arg.arg_name)
 428
 429
 430         out_java.write(");\n")
 431         out_c.write(") {\n")
 432         if out_java_struct is not None:
 433             out_java_struct.write(") {\n")
 434
 435         for info in arg_names:
 436             if info.arg_conv is not None:
 437                 out_c.write("\t" + info.arg_conv.replace('\n', "\n\t") + "\n");
 438
 439         if ret_info.ret_conv is not None:
 440             out_c.write("\t" + ret_conv_pfx.replace('\n', '\n\t'));
 441         else:
 442             out_c.write("\treturn ");
 443
 444         if c_call_string is None:
 445             out_c.write(re_match.group(2) + "(")
 446         else:
 447             out_c.write(c_call_string)
 448         for idx, info in enumerate(arg_names):
 449             if info.arg_conv_name is not None:
 450                 if idx != 0:
 451                     out_c.write(", ")
 452                 elif c_call_string is not None:
 453                     continue
 454                 out_c.write(info.arg_conv_name)
 455         out_c.write(")")
 456         if ret_info.ret_conv is not None:
 457             out_c.write(ret_conv_sfx.replace('\n', '\n\t'))
 458             out_c.write("\n\treturn " + ret_info.ret_conv_name + ";")
 459         else:
 460             out_c.write(";")
 461         out_c.write("\n}\n\n")
 462         if out_java_struct is not None:
 463             out_java_struct.write("\t\t")
 464             if ret_info.rust_obj == "LDK" + struct_meth:
 465                 out_java_struct.write("super(")
 466             elif ret_info.java_ty != "void" and not ret_info.passed_as_ptr:
 467                 out_java_struct.write(ret_info.java_ty + " ret = ")
 468             elif ret_info.java_ty != "void":
 469                 out_java_struct.write(ret_info.rust_obj.replace("LDK", "") + " ret = ")
 470                 if ret_info.rust_obj in opaque_structs or ret_info.rust_obj in trait_structs:
 471                     out_java_struct.write("new " + ret_info.rust_obj.replace("LDK", "") + "(null, ")
 472             out_java_struct.write("bindings." + re_match.group(2) + "(")
 473             for idx, info in enumerate(arg_names):
 474                 if idx != 0:
 475                     out_java_struct.write(", ")
 476                 if info.arg_name == "this_arg":
 477                     out_java_struct.write("this.ptr")
 478                 elif info.passed_as_ptr and info.rust_obj in opaque_structs:
 479                     out_java_struct.write(info.arg_name + ".ptr & ~1")
 480                 elif info.passed_as_ptr and info.rust_obj in trait_structs:
 481                     out_java_struct.write(info.arg_name + ".ptr")
 482                 else:
 483                     out_java_struct.write(info.arg_name)
 484             out_java_struct.write(")")
 485             if ret_info.rust_obj == "LDK" + struct_meth:
 486                 out_java_struct.write(");\n")
 487             elif ret_info.rust_obj in opaque_structs:
 488                 out_java_struct.write(");\n")
 489             elif ret_info.rust_obj in trait_structs:
 490                 out_java_struct.write(");\n\t\tret.ptrs_to.add(this);\n")
 491             else:
 492                 out_java_struct.write(";\n")
 493
 494             for info in arg_names:
 495                 if info.arg_name == "this_arg":
 496                     pass
 497                 elif info.passed_as_ptr and (info.rust_obj in opaque_structs or info.rust_obj in trait_structs):
 498                     out_java_struct.write("\t\tthis.ptrs_to.add(" + info.arg_name + ");\n")
 499
 500             if ret_info.java_ty != "void" and ret_info.rust_obj != "LDK" + struct_meth:
 501                 out_java_struct.write("\t\treturn ret;\n")
 502             out_java_struct.write("\t}\n\n")
 503             out_java_struct.close()
 504
 505     def map_unitary_enum(struct_name, field_lines):
 506         with open(sys.argv[3] + "/enums/" + struct_name + ".java", "w") as out_java_enum:
 507             out_java_enum.write("package org.ldk.enums;\n\n")
 508             unitary_enums.add(struct_name)
 509             out_c.write("static inline " + struct_name + " " + struct_name + "_from_java(JNIEnv *env, jclass val) {\n")
 510             out_c.write("\tswitch ((*env)->CallIntMethod(env, val, ordinal_meth)) {\n")
 511             ord_v = 0
 512             for idx, struct_line in enumerate(field_lines):
 513                 if idx == 0:
 514                     out_java_enum.write("public enum " + struct_name + " {\n")
 515                 elif idx == len(field_lines) - 3:
 516                     assert(struct_line.endswith("_Sentinel,"))
 517                 elif idx == len(field_lines) - 2:
 518                     out_java_enum.write("\t; static native void init();\n")
 519                     out_java_enum.write("\tstatic { init(); }\n")
 520                     out_java_enum.write("}")
 521                     out_java.write("\tstatic { " + struct_name + ".values(); /* Force enum statics to run */ }\n")
 522                 elif idx == len(field_lines) - 1:
 523                     assert(struct_line == "")
 524                 else:
 525                     out_java_enum.write(struct_line + "\n")
 526                     out_c.write("\t\tcase %d: return %s;\n" % (ord_v, struct_line.strip().strip(",")))
 527                     ord_v = ord_v + 1
 528             out_c.write("\t}\n")
 529             out_c.write("\tabort();\n")
 530             out_c.write("}\n")
 531
 532             ord_v = 0
 533             out_c.write("static jclass " + struct_name + "_class = NULL;\n")
 534             for idx, struct_line in enumerate(field_lines):
 535                 if idx > 0 and idx < len(field_lines) - 3:
 536                     variant = struct_line.strip().strip(",")
 537                     out_c.write("static jfieldID " + struct_name + "_" + variant + " = NULL;\n")
 538             out_c.write("JNIEXPORT void JNICALL Java_org_ldk_enums_" + struct_name.replace("_", "_1") + "_init (JNIEnv * env, jclass clz) {\n")
 539             out_c.write("\t" + struct_name + "_class = (*env)->NewGlobalRef(env, clz);\n")
 540             out_c.write("\tCHECK(" + struct_name + "_class != NULL);\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" + struct_name + "_" + variant + " = (*env)->GetStaticFieldID(env, " + struct_name + "_class, \"" + variant + "\", \"Lorg/ldk/enums/" + struct_name + ";\");\n")
 545                     out_c.write("\tCHECK(" + struct_name + "_" + variant + " != NULL);\n")
 546             out_c.write("}\n")
 547             out_c.write("static inline jclass " + struct_name + "_to_java(JNIEnv *env, " + struct_name + " val) {\n")
 548             out_c.write("\tswitch (val) {\n")
 549             for idx, struct_line in enumerate(field_lines):
 550                 if idx > 0 and idx < len(field_lines) - 3:
 551                     variant = struct_line.strip().strip(",")
 552                     out_c.write("\t\tcase " + variant + ":\n")
 553                     out_c.write("\t\t\treturn (*env)->GetStaticObjectField(env, " + struct_name + "_class, " + struct_name + "_" + variant + ");\n")
 554                     ord_v = ord_v + 1
 555             out_c.write("\t\tdefault: abort();\n")
 556             out_c.write("\t}\n")
 557             out_c.write("}\n\n")
 558
 559     def map_complex_enum(struct_name, union_enum_items):
 560         tag_field_lines = union_enum_items["field_lines"]
 561         init_meth_jty_strs = {}
 562         for idx, struct_line in enumerate(tag_field_lines):
 563             if idx == 0:
 564                 out_java.write("\tpublic static class " + struct_name + " {\n")
 565                 out_java.write("\t\tprivate " + struct_name + "() {}\n")
 566             elif idx == len(tag_field_lines) - 3:
 567                 assert(struct_line.endswith("_Sentinel,"))
 568             elif idx == len(tag_field_lines) - 2:
 569                 out_java.write("\t\tstatic native void init();\n")
 570                 out_java.write("\t}\n")
 571             elif idx == len(tag_field_lines) - 1:
 572                 assert(struct_line == "")
 573             else:
 574                 var_name = struct_line.strip(' ,')[len(struct_name) + 1:]
 575                 out_java.write("\t\tpublic final static class " + var_name + " extends " + struct_name + " {\n")
 576                 out_c.write("static jclass " + struct_name + "_" + var_name + "_class = NULL;\n")
 577                 out_c.write("static jmethodID " + struct_name + "_" + var_name + "_meth = NULL;\n")
 578                 init_meth_jty_str = ""
 579                 init_meth_params = ""
 580                 init_meth_body = ""
 581                 if "LDK" + var_name in union_enum_items:
 582                     enum_var_lines = union_enum_items["LDK" + var_name]
 583                     for idx, field in enumerate(enum_var_lines):
 584                         if idx != 0 and idx < len(enum_var_lines) - 2:
 585                             field_ty = java_c_types(field.strip(' ;'), None)
 586                             out_java.write("\t\t\tpublic " + field_ty.java_ty + " " + field_ty.var_name + ";\n")
 587                             init_meth_jty_str = init_meth_jty_str + field_ty.java_fn_ty_arg
 588                             if idx > 1:
 589                                 init_meth_params = init_meth_params + ", "
 590                             init_meth_params = init_meth_params + field_ty.java_ty + " " + field_ty.var_name
 591                             init_meth_body = init_meth_body + "this." + field_ty.var_name + " = " + field_ty.var_name + "; "
 592                     out_java.write("\t\t\t" + var_name + "(" + init_meth_params + ") { ")
 593                     out_java.write(init_meth_body)
 594                     out_java.write("}\n")
 595                 out_java.write("\t\t}\n")
 596                 init_meth_jty_strs[var_name] = init_meth_jty_str
 597         out_java.write("\tstatic { " + struct_name + ".init(); }\n")
 598         out_java.write("\tpublic static native " + struct_name + " " + struct_name + "_ref_from_ptr(long ptr);\n");
 599
 600         out_c.write("JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_00024" + struct_name.replace("_", "_1") + "_init (JNIEnv * env, jclass _a) {\n")
 601         for idx, struct_line in enumerate(tag_field_lines):
 602             if idx != 0 and idx < len(tag_field_lines) - 3:
 603                 var_name = struct_line.strip(' ,')[len(struct_name) + 1:]
 604                 out_c.write("\t" + struct_name + "_" + var_name + "_class =\n")
 605                 out_c.write("\t\t(*env)->NewGlobalRef(env, (*env)->FindClass(env, \"Lorg/ldk/impl/bindings$" + struct_name + "$" + var_name + ";\"));\n")
 606                 out_c.write("\tCHECK(" + struct_name + "_" + var_name + "_class != NULL);\n")
 607                 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")
 608                 out_c.write("\tCHECK(" + struct_name + "_" + var_name + "_meth != NULL);\n")
 609         out_c.write("}\n")
 610         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")
 611         out_c.write("\t" + struct_name + " *obj = (" + struct_name + "*)ptr;\n")
 612         out_c.write("\tswitch(obj->tag) {\n")
 613         for idx, struct_line in enumerate(tag_field_lines):
 614             if idx != 0 and idx < len(tag_field_lines) - 3:
 615                 var_name = struct_line.strip(' ,')[len(struct_name) + 1:]
 616                 out_c.write("\t\tcase " + struct_name + "_" + var_name + ": {\n")
 617                 c_params_text = ""
 618                 if "LDK" + var_name in union_enum_items:
 619                     enum_var_lines = union_enum_items["LDK" + var_name]
 620                     for idx, field in enumerate(enum_var_lines):
 621                         if idx != 0 and idx < len(enum_var_lines) - 2:
 622                             field_map = map_type(field.strip(' ;'), False, None, False)
 623                             if field_map.ret_conv is not None:
 624                                 out_c.write("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t").replace("_env", "env"))
 625                                 out_c.write("obj->" + camel_to_snake(var_name) + "." + field_map.arg_name)
 626                                 out_c.write(field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
 627                                 c_params_text = c_params_text + ", " + field_map.ret_conv_name
 628                             else:
 629                                 c_params_text = c_params_text + ", obj->" + camel_to_snake(var_name) + "." + field_map.arg_name
 630                 out_c.write("\t\t\treturn (*env)->NewObject(env, " + struct_name + "_" + var_name + "_class, " + struct_name + "_" + var_name + "_meth" + c_params_text + ");\n")
 631                 out_c.write("\t\t}\n")
 632         out_c.write("\t\tdefault: abort();\n")
 633         out_c.write("\t}\n}\n")
 634
 635     def map_trait(struct_name, field_var_lines, trait_fn_lines):
 636         with open(sys.argv[3] + "/structs/" + struct_name.replace("LDK","") + ".java", "w") as out_java_trait:
 637             out_c.write("typedef struct " + struct_name + "_JCalls {\n")
 638             out_c.write("\tatomic_size_t refcnt;\n")
 639             out_c.write("\tJavaVM *vm;\n")
 640             out_c.write("\tjweak o;\n")
 641             for var_line in field_var_lines:
 642                 if var_line.group(1) in trait_structs:
 643                     out_c.write("\t" + var_line.group(1) + "_JCalls* " + var_line.group(2) + ";\n")
 644             for fn_line in trait_fn_lines:
 645                 if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
 646                     out_c.write("\tjmethodID " + fn_line.group(2) + "_meth;\n")
 647             out_c.write("} " + struct_name + "_JCalls;\n")
 648
 649             out_java_trait.write("package org.ldk.structs;\n\n")
 650             out_java_trait.write("import org.ldk.impl.bindings;\n\n")
 651             out_java_trait.write("import org.ldk.enums.*;\n\n")
 652             out_java_trait.write("public class " + struct_name.replace("LDK","") + " extends CommonBase {\n")
 653             out_java_trait.write("\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); }\n")
 654             out_java_trait.write("\tpublic " + struct_name.replace("LDK", "") + "(bindings." + struct_name + " arg")
 655             for var_line in field_var_lines:
 656                 if var_line.group(1) in trait_structs:
 657                     out_java_trait.write(", bindings." + var_line.group(1) + " " + var_line.group(2))
 658             out_java_trait.write(") {\n")
 659             out_java_trait.write("\t\tsuper(bindings." + struct_name + "_new(arg")
 660             for var_line in field_var_lines:
 661                 if var_line.group(1) in trait_structs:
 662                     out_java_trait.write(", " + var_line.group(2))
 663             out_java_trait.write("));\n")
 664             out_java_trait.write("\t\tthis.ptrs_to.add(arg);\n")
 665             out_java_trait.write("\t}\n")
 666             out_java_trait.write("\t@Override @SuppressWarnings(\"deprecation\")\n")
 667             out_java_trait.write("\tprotected void finalize() throws Throwable {\n")
 668             out_java_trait.write("\t\tbindings." + struct_name.replace("LDK","") + "_free(ptr); super.finalize();\n")
 669             out_java_trait.write("\t}\n\n")
 670
 671             out_java.write("\tpublic interface " + struct_name + " {\n")
 672             java_meths = []
 673             for fn_line in trait_fn_lines:
 674                 java_meth_descr = "("
 675                 if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
 676                     ret_ty_info = java_c_types(fn_line.group(1), None)
 677
 678                     out_java.write("\t\t " + ret_ty_info.java_ty + " " + fn_line.group(2) + "(")
 679                     is_const = fn_line.group(3) is not None
 680                     out_c.write(fn_line.group(1) + fn_line.group(2) + "_jcall(")
 681                     if is_const:
 682                         out_c.write("const void* this_arg")
 683                     else:
 684                         out_c.write("void* this_arg")
 685
 686                     arg_names = []
 687                     for idx, arg in enumerate(fn_line.group(4).split(',')):
 688                         if arg == "":
 689                             continue
 690                         if idx >= 2:
 691                             out_java.write(", ")
 692                         out_c.write(", ")
 693                         arg_conv_info = map_type(arg, True, None, False)
 694                         out_c.write(arg.strip())
 695                         out_java.write(arg_conv_info.java_ty + " " + arg_conv_info.arg_name)
 696                         arg_names.append(arg_conv_info)
 697                         java_meth_descr = java_meth_descr + arg_conv_info.java_fn_ty_arg
 698                     java_meth_descr = java_meth_descr + ")" + ret_ty_info.java_fn_ty_arg
 699                     java_meths.append(java_meth_descr)
 700
 701                     out_java.write(");\n")
 702                     out_c.write(") {\n")
 703                     out_c.write("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
 704                     out_c.write("\tJNIEnv *env;\n")
 705                     out_c.write("\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_8) == JNI_OK);\n")
 706
 707                     for arg_info in arg_names:
 708                         if arg_info.ret_conv is not None:
 709                             out_c.write("\t" + arg_info.ret_conv[0].replace('\n', '\n\t').replace("_env", "env"));
 710                             out_c.write(arg_info.arg_name)
 711                             out_c.write(arg_info.ret_conv[1].replace('\n', '\n\t').replace("_env", "env") + "\n")
 712
 713                     out_c.write("\tjobject obj = (*env)->NewLocalRef(env, j_calls->o);\n\tCHECK(obj != NULL);\n")
 714                     if ret_ty_info.c_ty.endswith("Array"):
 715                         assert(ret_ty_info.c_ty == "jbyteArray")
 716                         out_c.write("\tjbyteArray jret = (*env)->CallObjectMethod(env, obj, j_calls->" + fn_line.group(2) + "_meth")
 717                     elif not ret_ty_info.passed_as_ptr:
 718                         out_c.write("\treturn (*env)->Call" + ret_ty_info.java_ty.title() + "Method(env, obj, j_calls->" + fn_line.group(2) + "_meth")
 719                     else:
 720                         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");
 721
 722                     for arg_info in arg_names:
 723                         if arg_info.ret_conv is not None:
 724                             out_c.write(", " + arg_info.ret_conv_name)
 725                         else:
 726                             out_c.write(", " + arg_info.arg_name)
 727                     out_c.write(");\n");
 728                     if ret_ty_info.c_ty.endswith("Array"):
 729                         out_c.write("\t" + ret_ty_info.rust_obj + " ret;\n")
 730                         out_c.write("\tCHECK((*env)->GetArrayLength(env, jret) == " + ret_ty_info.arr_len + ");\n")
 731                         out_c.write("\t(*env)->GetByteArrayRegion(env, jret, 0, " + ret_ty_info.arr_len + ", ret." + ret_ty_info.arr_access + ");\n")
 732                         out_c.write("\treturn ret;\n")
 733
 734                     if ret_ty_info.passed_as_ptr:
 735                         out_c.write("\t" + fn_line.group(1).strip() + " res = *ret;\n")
 736                         out_c.write("\tFREE(ret);\n")
 737                         out_c.write("\treturn res;\n")
 738                     out_c.write("}\n")
 739                 elif fn_line.group(2) == "free":
 740                     out_c.write("static void " + struct_name + "_JCalls_free(void* this_arg) {\n")
 741                     out_c.write("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
 742                     out_c.write("\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n")
 743                     out_c.write("\t\tJNIEnv *env;\n")
 744                     out_c.write("\t\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_8) == JNI_OK);\n")
 745                     out_c.write("\t\t(*env)->DeleteWeakGlobalRef(env, j_calls->o);\n")
 746                     out_c.write("\t\tFREE(j_calls);\n")
 747                     out_c.write("\t}\n}\n")
 748
 749             # Write out a clone function whether we need one or not, as we use them in moving to rust
 750             out_c.write("static void* " + struct_name + "_JCalls_clone(const void* this_arg) {\n")
 751             out_c.write("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
 752             out_c.write("\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n")
 753             for var_line in field_var_lines:
 754                 if var_line.group(1) in trait_structs:
 755                     out_c.write("\tatomic_fetch_add_explicit(&j_calls->" + var_line.group(2) + "->refcnt, 1, memory_order_release);\n")
 756             out_c.write("\treturn (void*) this_arg;\n")
 757             out_c.write("}\n")
 758
 759             out_java.write("\t}\n")
 760
 761             out_java.write("\tpublic static native long " + struct_name + "_new(" + struct_name + " impl")
 762             out_c.write("static inline " + struct_name + " " + struct_name + "_init (JNIEnv * env, jclass _a, jobject o")
 763             for var_line in field_var_lines:
 764                 if var_line.group(1) in trait_structs:
 765                     out_java.write(", " + var_line.group(1) + " " + var_line.group(2))
 766                     out_c.write(", jobject " + var_line.group(2))
 767             out_java.write(");\n")
 768             out_c.write(") {\n")
 769
 770             out_c.write("\tjclass c = (*env)->GetObjectClass(env, o);\n")
 771             out_c.write("\tCHECK(c != NULL);\n")
 772             out_c.write("\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n")
 773             out_c.write("\tatomic_init(&calls->refcnt, 1);\n")
 774             out_c.write("\tDO_ASSERT((*env)->GetJavaVM(env, &calls->vm) == 0);\n")
 775             out_c.write("\tcalls->o = (*env)->NewWeakGlobalRef(env, o);\n")
 776             for (fn_line, java_meth_descr) in zip(trait_fn_lines, java_meths):
 777                 if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
 778                     out_c.write("\tcalls->" + fn_line.group(2) + "_meth = (*env)->GetMethodID(env, c, \"" + fn_line.group(2) + "\", \"" + java_meth_descr + "\");\n")
 779                     out_c.write("\tCHECK(calls->" + fn_line.group(2) + "_meth != NULL);\n")
 780             out_c.write("\n\t" + struct_name + " ret = {\n")
 781             out_c.write("\t\t.this_arg = (void*) calls,\n")
 782             for fn_line in trait_fn_lines:
 783                 if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
 784                     out_c.write("\t\t." + fn_line.group(2) + " = " + fn_line.group(2) + "_jcall,\n")
 785                 elif fn_line.group(2) == "free":
 786                     out_c.write("\t\t.free = " + struct_name + "_JCalls_free,\n")
 787                 else:
 788                     out_c.write("\t\t.clone = " + struct_name + "_JCalls_clone,\n")
 789             for var_line in field_var_lines:
 790                 if var_line.group(1) in trait_structs:
 791                     out_c.write("\t\t." + var_line.group(2) + " = " + var_line.group(1) + "_init(env, _a, " + var_line.group(2) + "),\n")
 792             out_c.write("\t};\n")
 793             for var_line in field_var_lines:
 794                 if var_line.group(1) in trait_structs:
 795                     out_c.write("\tcalls->" + var_line.group(2) + " = ret." + var_line.group(2) + ".this_arg;\n")
 796             out_c.write("\treturn ret;\n")
 797             out_c.write("}\n")
 798
 799             out_c.write("JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1new (JNIEnv * env, jclass _a, jobject o")
 800             for var_line in field_var_lines:
 801                 if var_line.group(1) in trait_structs:
 802                     out_c.write(", jobject " + var_line.group(2))
 803             out_c.write(") {\n")
 804             out_c.write("\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n")
 805             out_c.write("\t*res_ptr = " + struct_name + "_init(env, _a, o")
 806             for var_line in field_var_lines:
 807                 if var_line.group(1) in trait_structs:
 808                     out_c.write(", " + var_line.group(2))
 809             out_c.write(");\n")
 810             out_c.write("\treturn (long)res_ptr;\n")
 811             out_c.write("}\n")
 812
 813             out_java.write("\tpublic static native " + struct_name + " " + struct_name + "_get_obj_from_jcalls(long val);\n")
 814             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")
 815             out_c.write("\tjobject ret = (*env)->NewLocalRef(env, ((" + struct_name + "_JCalls*)val)->o);\n")
 816             out_c.write("\tCHECK(ret != NULL);\n")
 817             out_c.write("\treturn ret;\n")
 818             out_c.write("}\n")
 819
 820         for fn_line in trait_fn_lines:
 821             # For now, just disable enabling the _call_log - we don't know how to inverse-map String
 822             is_log = fn_line.group(2) == "log" and struct_name == "LDKLogger"
 823             if fn_line.group(2) != "free" and fn_line.group(2) != "clone" and fn_line.group(2) != "eq" and not is_log:
 824                 dummy_line = fn_line.group(1) + struct_name.replace("LDK", "") + "_call_" + fn_line.group(2) + " " + struct_name + "* this_arg" + fn_line.group(4) + "\n"
 825                 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")
 826
 827     out_c.write("""#include \"org_ldk_impl_bindings.h\"
 828 #include <rust_types.h>
 829 #include <lightning.h>
 830 #include <string.h>
 831 #include <stdatomic.h>
 832 """)
 833
 834     if sys.argv[4] == "false":
 835         out_c.write("#define MALLOC(a, _) malloc(a)\n")
 836         out_c.write("#define FREE free\n")
 837         out_c.write("#define DO_ASSERT(a) (void)(a)\n")
 838         out_c.write("#define CHECK(a)\n")
 839     else:
 840         out_c.write("""#include <assert.h>
 841 // Always run a, then assert it is true:
 842 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
 843 // Assert a is true or do nothing
 844 #define CHECK(a) DO_ASSERT(a)
 845
 846 // Running a leak check across all the allocations and frees of the JDK is a mess,
 847 // so instead we implement our own naive leak checker here, relying on the -wrap
 848 // linker option to wrap malloc/calloc/realloc/free, tracking everyhing allocated
 849 // and free'd in Rust or C across the generated bindings shared library.
 850 #include <threads.h>
 851 #include <execinfo.h>
 852 #include <unistd.h>
 853 static mtx_t allocation_mtx;
 854
 855 void __attribute__((constructor)) init_mtx() {
 856         DO_ASSERT(mtx_init(&allocation_mtx, mtx_plain) == thrd_success);
 857 }
 858
 859 #define BT_MAX 128
 860 typedef struct allocation {
 861         struct allocation* next;
 862         void* ptr;
 863         const char* struct_name;
 864         void* bt[BT_MAX];
 865         int bt_len;
 866 } allocation;
 867 static allocation* allocation_ll = NULL;
 868
 869 void* __real_malloc(size_t len);
 870 void* __real_calloc(size_t nmemb, size_t len);
 871 static void new_allocation(void* res, const char* struct_name) {
 872         allocation* new_alloc = __real_malloc(sizeof(allocation));
 873         new_alloc->ptr = res;
 874         new_alloc->struct_name = struct_name;
 875         new_alloc->bt_len = backtrace(new_alloc->bt, BT_MAX);
 876         DO_ASSERT(mtx_lock(&allocation_mtx) == thrd_success);
 877         new_alloc->next = allocation_ll;
 878         allocation_ll = new_alloc;
 879         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
 880 }
 881 static void* MALLOC(size_t len, const char* struct_name) {
 882         void* res = __real_malloc(len);
 883         new_allocation(res, struct_name);
 884         return res;
 885 }
 886 void __real_free(void* ptr);
 887 static void alloc_freed(void* ptr) {
 888         allocation* p = NULL;
 889         DO_ASSERT(mtx_lock(&allocation_mtx) == thrd_success);
 890         allocation* it = allocation_ll;
 891         while (it->ptr != ptr) { p = it; it = it->next; }
 892         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
 893         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
 894         DO_ASSERT(it->ptr == ptr);
 895         __real_free(it);
 896 }
 897 static void FREE(void* ptr) {
 898         alloc_freed(ptr);
 899         __real_free(ptr);
 900 }
 901
 902 void* __wrap_malloc(size_t len) {
 903         void* res = __real_malloc(len);
 904         new_allocation(res, "malloc call");
 905         return res;
 906 }
 907 void* __wrap_calloc(size_t nmemb, size_t len) {
 908         void* res = __real_calloc(nmemb, len);
 909         new_allocation(res, "calloc call");
 910         return res;
 911 }
 912 void __wrap_free(void* ptr) {
 913         alloc_freed(ptr);
 914         __real_free(ptr);
 915 }
 916
 917 void* __real_realloc(void* ptr, size_t newlen);
 918 void* __wrap_realloc(void* ptr, size_t len) {
 919         alloc_freed(ptr);
 920         void* res = __real_realloc(ptr, len);
 921         new_allocation(res, "realloc call");
 922         return res;
 923 }
 924 void __wrap_reallocarray(void* ptr, size_t new_sz) {
 925         // Rust doesn't seem to use reallocarray currently
 926         assert(false);
 927 }
 928
 929 void __attribute__((destructor)) check_leaks() {
 930         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 931                 fprintf(stderr, "%s %p remains:\\n", a->struct_name, a->ptr);
 932                 backtrace_symbols_fd(a->bt, a->bt_len, STDERR_FILENO);
 933                 fprintf(stderr, "\\n\\n");
 934         }
 935         DO_ASSERT(allocation_ll == NULL);
 936 }
 937 """)
 938     out_java.write("""package org.ldk.impl;
 939 import org.ldk.enums.*;
 940
 941 public class bindings {
 942         public static class VecOrSliceDef {
 943                 public long dataptr;
 944                 public long datalen;
 945                 public long stride;
 946                 public VecOrSliceDef(long dataptr, long datalen, long stride) {
 947                         this.dataptr = dataptr; this.datalen = datalen; this.stride = stride;
 948                 }
 949         }
 950         static {
 951                 System.loadLibrary(\"lightningjni\");
 952                 init(java.lang.Enum.class, VecOrSliceDef.class);
 953         }
 954         static native void init(java.lang.Class c, java.lang.Class slicedef);
 955
 956         public static native boolean deref_bool(long ptr);
 957         public static native long deref_long(long ptr);
 958         public static native void free_heap_ptr(long ptr);
 959         public static native byte[] read_bytes(long ptr, long len);
 960         public static native byte[] get_u8_slice_bytes(long slice_ptr);
 961         public static native long bytes_to_u8_vec(byte[] bytes);
 962         public static native long new_txpointer_copy_data(byte[] txdata);
 963         public static native long vec_slice_len(long vec);
 964         public static native long new_empty_slice_vec();
 965
 966 """)
 967     out_c.write("""
 968 static jmethodID ordinal_meth = NULL;
 969 static jmethodID slicedef_meth = NULL;
 970 static jclass slicedef_cls = NULL;
 971 JNIEXPORT void Java_org_ldk_impl_bindings_init(JNIEnv * env, jclass _b, jclass enum_class, jclass slicedef_class) {
 972         ordinal_meth = (*env)->GetMethodID(env, enum_class, "ordinal", "()I");
 973         CHECK(ordinal_meth != NULL);
 974         slicedef_meth = (*env)->GetMethodID(env, slicedef_class, "<init>", "(JJJ)V");
 975         CHECK(slicedef_meth != NULL);
 976         slicedef_cls = (*env)->NewGlobalRef(env, slicedef_class);
 977         CHECK(slicedef_cls != NULL);
 978 }
 979
 980 JNIEXPORT jboolean JNICALL Java_org_ldk_impl_bindings_deref_1bool (JNIEnv * env, jclass _a, jlong ptr) {
 981         return *((bool*)ptr);
 982 }
 983 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_deref_1long (JNIEnv * env, jclass _a, jlong ptr) {
 984         return *((long*)ptr);
 985 }
 986 JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_free_1heap_1ptr (JNIEnv * env, jclass _a, jlong ptr) {
 987         FREE((void*)ptr);
 988 }
 989 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_read_1bytes (JNIEnv * _env, jclass _b, jlong ptr, jlong len) {
 990         jbyteArray ret_arr = (*_env)->NewByteArray(_env, len);
 991         (*_env)->SetByteArrayRegion(_env, ret_arr, 0, len, (unsigned char*)ptr);
 992         return ret_arr;
 993 }
 994 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_get_1u8_1slice_1bytes (JNIEnv * _env, jclass _b, jlong slice_ptr) {
 995         LDKu8slice *slice = (LDKu8slice*)slice_ptr;
 996         jbyteArray ret_arr = (*_env)->NewByteArray(_env, slice->datalen);
 997         (*_env)->SetByteArrayRegion(_env, ret_arr, 0, slice->datalen, slice->data);
 998         return ret_arr;
 999 }
1000 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_bytes_1to_1u8_1vec (JNIEnv * _env, jclass _b, jbyteArray bytes) {
1001         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "LDKCVec_u8");
1002         vec->datalen = (*_env)->GetArrayLength(_env, bytes);
1003         vec->data = (uint8_t*)MALLOC(vec->datalen, "LDKCVec_u8Z Bytes");
1004         (*_env)->GetByteArrayRegion (_env, bytes, 0, vec->datalen, vec->data);
1005         return (long)vec;
1006 }
1007 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_new_1txpointer_1copy_1data (JNIEnv * env, jclass _b, jbyteArray bytes) {
1008         LDKTransaction *txdata = (LDKTransaction*)MALLOC(sizeof(LDKTransaction), "LDKTransaction");
1009         txdata->datalen = (*env)->GetArrayLength(env, bytes);
1010         txdata->data = (uint8_t*)MALLOC(txdata->datalen, "Tx Data Bytes");
1011         txdata->data_is_owned = true;
1012         (*env)->GetByteArrayRegion (env, bytes, 0, txdata->datalen, txdata->data);
1013         return (long)txdata;
1014 }
1015 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_vec_1slice_1len (JNIEnv * env, jclass _a, jlong ptr) {
1016         // Check offsets of a few Vec types are all consistent as we're meant to be generic across types
1017         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_SignatureZ, datalen), "Vec<*> needs to be mapped identically");
1018         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_MessageSendEventZ, datalen), "Vec<*> needs to be mapped identically");
1019         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_EventZ, datalen), "Vec<*> needs to be mapped identically");
1020         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_C2Tuple_usizeTransactionZZ, datalen), "Vec<*> needs to be mapped identically");
1021         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)ptr;
1022         return (long)vec->datalen;
1023 }
1024 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_new_1empty_1slice_1vec (JNIEnv * _env, jclass _b) {
1025         // Check sizes of a few Vec types are all consistent as we're meant to be generic across types
1026         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_SignatureZ), "Vec<*> needs to be mapped identically");
1027         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_MessageSendEventZ), "Vec<*> needs to be mapped identically");
1028         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_EventZ), "Vec<*> needs to be mapped identically");
1029         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_C2Tuple_usizeTransactionZZ), "Vec<*> needs to be mapped identically");
1030         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "Empty LDKCVec");
1031         vec->data = NULL;
1032         vec->datalen = 0;
1033         return (long)vec;
1034 }
1035
1036 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
1037 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
1038 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
1039 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
1040
1041 """)
1042
1043     with open(sys.argv[3] + "/structs/CommonBase.java", "a") as out_java_struct:
1044         out_java_struct.write("""package org.ldk.structs;
1045 import java.util.LinkedList;
1046 class CommonBase {
1047         final long ptr;
1048         LinkedList<Object> ptrs_to = new LinkedList();
1049         protected CommonBase(long ptr) { this.ptr = ptr; }
1050         public long _test_only_get_ptr() { return this.ptr; }
1051 }
1052 """)
1053
1054     in_block_comment = False
1055     cur_block_obj = None
1056
1057     const_val_regex = re.compile("^extern const ([A-Za-z_0-9]*) ([A-Za-z_0-9]*);$")
1058
1059     line_indicates_result_regex = re.compile("^   (LDKCResultPtr_[A-Za-z_0-9]*) contents;$")
1060     line_indicates_vec_regex = re.compile("^   ([A-Za-z_0-9]*) \*data;$")
1061     line_indicates_opaque_regex = re.compile("^   bool is_owned;$")
1062     line_indicates_trait_regex = re.compile("^   ([A-Za-z_0-9]* \*?)\(\*([A-Za-z_0-9]*)\)\((const )?void \*this_arg(.*)\);$")
1063     assert(line_indicates_trait_regex.match("   uintptr_t (*send_data)(void *this_arg, LDKu8slice data, bool resume_read);"))
1064     assert(line_indicates_trait_regex.match("   LDKCVec_MessageSendEventZ (*get_and_clear_pending_msg_events)(const void *this_arg);"))
1065     assert(line_indicates_trait_regex.match("   void *(*clone)(const void *this_arg);"))
1066     line_field_var_regex = re.compile("^   ([A-Za-z_0-9]*) ([A-Za-z_0-9]*);$")
1067     assert(line_field_var_regex.match("   LDKMessageSendEventsProvider MessageSendEventsProvider;"))
1068     struct_name_regex = re.compile("^typedef (struct|enum|union) (MUST_USE_STRUCT )?(LDK[A-Za-z_0-9]*) {$")
1069     assert(struct_name_regex.match("typedef struct LDKCVecTempl_u8 {"))
1070     assert(struct_name_regex.match("typedef enum LDKNetwork {"))
1071     struct_alias_regex = re.compile("^typedef (LDK[A-Za-z_0-9]*) (LDK[A-Za-z_0-9]*);$")
1072     assert(struct_alias_regex.match("typedef LDKCResultTempl_bool__PeerHandleError LDKCResult_boolPeerHandleErrorZ;"))
1073
1074     result_templ_structs = set()
1075     union_enum_items = {}
1076     result_ptr_struct_items = {}
1077     for line in in_h:
1078         if in_block_comment:
1079             if line.endswith("*/\n"):
1080                 in_block_comment = False
1081         elif cur_block_obj is not None:
1082             cur_block_obj  = cur_block_obj + line
1083             if line.startswith("} "):
1084                 field_lines = []
1085                 struct_name = None
1086                 vec_ty = None
1087                 obj_lines = cur_block_obj.split("\n")
1088                 is_opaque = False
1089                 result_contents = None
1090                 is_unitary_enum = False
1091                 is_union_enum = False
1092                 is_union = False
1093                 is_tuple = False
1094                 trait_fn_lines = []
1095                 field_var_lines = []
1096
1097                 for idx, struct_line in enumerate(obj_lines):
1098                     if struct_line.strip().startswith("/*"):
1099                         in_block_comment = True
1100                     if in_block_comment:
1101                         if struct_line.endswith("*/"):
1102                             in_block_comment = False
1103                     else:
1104                         struct_name_match = struct_name_regex.match(struct_line)
1105                         if struct_name_match is not None:
1106                             struct_name = struct_name_match.group(3)
1107                             if struct_name_match.group(1) == "enum":
1108                                 if not struct_name.endswith("_Tag"):
1109                                     is_unitary_enum = True
1110                                 else:
1111                                     is_union_enum = True
1112                             elif struct_name_match.group(1) == "union":
1113                                 is_union = True
1114                         if line_indicates_opaque_regex.match(struct_line):
1115                             is_opaque = True
1116                         result_match = line_indicates_result_regex.match(struct_line)
1117                         if result_match is not None:
1118                             result_contents = result_match.group(1)
1119                         vec_ty_match = line_indicates_vec_regex.match(struct_line)
1120                         if vec_ty_match is not None and struct_name.startswith("LDKCVecTempl_"):
1121                             vec_ty = vec_ty_match.group(1)
1122                         elif struct_name.startswith("LDKC2TupleTempl_") or struct_name.startswith("LDKC3TupleTempl_"):
1123                             is_tuple = True
1124                         trait_fn_match = line_indicates_trait_regex.match(struct_line)
1125                         if trait_fn_match is not None:
1126                             trait_fn_lines.append(trait_fn_match)
1127                         field_var_match = line_field_var_regex.match(struct_line)
1128                         if field_var_match is not None:
1129                             field_var_lines.append(field_var_match)
1130                         field_lines.append(struct_line)
1131
1132                 assert(struct_name is not None)
1133                 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))
1134                 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))
1135                 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))
1136                 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))
1137                 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))
1138                 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))
1139                 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))
1140
1141                 if is_opaque:
1142                     opaque_structs.add(struct_name)
1143                     with open(sys.argv[3] + "/structs/" + struct_name.replace("LDK","") + ".java", "w") as out_java_struct:
1144                         out_java_struct.write("package org.ldk.structs;\n\n")
1145                         out_java_struct.write("import org.ldk.impl.bindings;\n")
1146                         out_java_struct.write("import org.ldk.enums.*;\n\n")
1147                         out_java_struct.write("public class " + struct_name.replace("LDK","") + " extends CommonBase {\n")
1148                         out_java_struct.write("\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); }\n")
1149                         out_java_struct.write("\t@Override @SuppressWarnings(\"deprecation\")\n")
1150                         out_java_struct.write("\tprotected void finalize() throws Throwable {\n")
1151                         out_java_struct.write("\t\tbindings." + struct_name.replace("LDK","") + "_free(ptr); super.finalize();\n")
1152                         out_java_struct.write("\t}\n\n")
1153                 elif result_contents is not None:
1154                     result_templ_structs.add(struct_name)
1155                     assert result_contents in result_ptr_struct_items
1156                 elif struct_name.startswith("LDKCResultPtr_"):
1157                     for line in field_lines:
1158                         if line.endswith("*result;"):
1159                             res_ty = line[:-8].strip()
1160                         elif line.endswith("*err;"):
1161                             err_ty = line[:-5].strip()
1162                     result_ptr_struct_items[struct_name] = (res_ty, err_ty)
1163                 elif is_tuple:
1164                     out_java.write("\tpublic static native long " + struct_name + "_new(")
1165                     out_c.write("JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1new(JNIEnv *_env, jclass _b")
1166                     for idx, line in enumerate(field_lines):
1167                         if idx != 0 and idx < len(field_lines) - 2:
1168                             ty_info = java_c_types(line.strip(';'), None)
1169                             if idx != 1:
1170                                 out_java.write(", ")
1171                             e = chr(ord('a') + idx - 1)
1172                             out_java.write(ty_info.java_ty + " " + e)
1173                             out_c.write(", " + ty_info.c_ty + " " + e)
1174                     out_java.write(");\n")
1175                     out_c.write(") {\n")
1176                     out_c.write("\t" + struct_name + "* ret = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n")
1177                     for idx, line in enumerate(field_lines):
1178                         if idx != 0 and idx < len(field_lines) - 2:
1179                             ty_info = map_type(line.strip(';'), False, None, False)
1180                             e = chr(ord('a') + idx - 1)
1181                             if ty_info.arg_conv is not None:
1182                                 out_c.write("\t" + ty_info.arg_conv.replace("\n", "\n\t"))
1183                                 out_c.write("\n\tret->" + e + " = " + ty_info.arg_conv_name + ";\n")
1184                             else:
1185                                 out_c.write("\tret->" + e + " = " + e + ";\n")
1186                     out_c.write("\treturn (long)ret;\n")
1187                     out_c.write("}\n")
1188                 elif vec_ty is not None:
1189                     if vec_ty in opaque_structs:
1190                         out_java.write("\tpublic static native long[] " + struct_name + "_arr_info(long vec_ptr);\n")
1191                         out_c.write("JNIEXPORT jlongArray JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1arr_1info(JNIEnv *env, jclass _b, jlong ptr) {\n")
1192                     else:
1193                         out_java.write("\tpublic static native VecOrSliceDef " + struct_name + "_arr_info(long vec_ptr);\n")
1194                         out_c.write("JNIEXPORT jobject JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1arr_1info(JNIEnv *env, jclass _b, jlong ptr) {\n")
1195                     out_c.write("\t" + struct_name + " *vec = (" + struct_name + "*)ptr;\n")
1196                     if vec_ty in opaque_structs:
1197                         out_c.write("\tjlongArray ret = (*env)->NewLongArray(env, vec->datalen);\n")
1198                         out_c.write("\tjlong *ret_elems = (*env)->GetPrimitiveArrayCritical(env, ret, NULL);\n")
1199                         out_c.write("\tfor (size_t i = 0; i < vec->datalen; i++) {\n")
1200                         out_c.write("\t\tCHECK((((long)vec->data[i].inner) & 1) == 0);\n")
1201                         out_c.write("\t\tret_elems[i] = (long)vec->data[i].inner | (vec->data[i].is_owned ? 1 : 0);\n")
1202                         out_c.write("\t}\n")
1203                         out_c.write("\t(*env)->ReleasePrimitiveArrayCritical(env, ret, ret_elems, 0);\n")
1204                         out_c.write("\treturn ret;\n")
1205                     else:
1206                         out_c.write("\treturn (*env)->NewObject(env, slicedef_cls, slicedef_meth, (long)vec->data, (long)vec->datalen, sizeof(" + vec_ty + "));\n")
1207                     out_c.write("}\n")
1208
1209                     ty_info = map_type(vec_ty + " arr_elem", False, None, False)
1210                     if len(ty_info.java_fn_ty_arg) == 1: # ie we're a primitive of some form
1211                         out_java.write("\tpublic static native long " + struct_name + "_new(" + ty_info.java_ty + "[] elems);\n")
1212                         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")
1213                         out_c.write("\t" + struct_name + " *ret = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n")
1214                         out_c.write("\tret->datalen = (*env)->GetArrayLength(env, elems);\n")
1215                         out_c.write("\tif (ret->datalen == 0) {\n")
1216                         out_c.write("\t\tret->data = NULL;\n")
1217                         out_c.write("\t} else {\n")
1218                         out_c.write("\t\tret->data = MALLOC(sizeof(" + vec_ty + ") * ret->datalen, \"" + struct_name + " Data\");\n")
1219                         out_c.write("\t\t" + ty_info.c_ty + " *java_elems = (*env)->GetPrimitiveArrayCritical(env, elems, NULL);\n")
1220                         out_c.write("\t\tfor (size_t i = 0; i < ret->datalen; i++) {\n")
1221                         if ty_info.arg_conv is not None:
1222                             out_c.write("\t\t\t" + ty_info.c_ty + " arr_elem = java_elems[i];\n")
1223                             out_c.write("\t\t\t" + ty_info.arg_conv.replace("\n", "\n\t\t\t") + "\n")
1224                             out_c.write("\t\t\tret->data[i] = " + ty_info.arg_conv_name + ";\n")
1225                         else:
1226                             out_c.write("\t\t\tret->data[i] = java_elems[i];\n")
1227                         out_c.write("\t\t}\n")
1228                         out_c.write("\t\t(*env)->ReleasePrimitiveArrayCritical(env, elems, java_elems, 0);\n")
1229                         out_c.write("\t}\n")
1230                         out_c.write("\treturn (long)ret;\n")
1231                         out_c.write("}\n")
1232                 elif is_union_enum:
1233                     assert(struct_name.endswith("_Tag"))
1234                     struct_name = struct_name[:-4]
1235                     union_enum_items[struct_name] = {"field_lines": field_lines}
1236                 elif struct_name.endswith("_Body") and struct_name.split("_")[0] in union_enum_items:
1237                     enum_var_name = struct_name.split("_")
1238                     union_enum_items[enum_var_name[0]][enum_var_name[1]] = field_lines
1239                 elif struct_name in union_enum_items:
1240                     map_complex_enum(struct_name, union_enum_items[struct_name])
1241                 elif is_unitary_enum:
1242                     map_unitary_enum(struct_name, field_lines)
1243                 elif len(trait_fn_lines) > 0:
1244                     trait_structs.add(struct_name)
1245                     map_trait(struct_name, field_var_lines, trait_fn_lines)
1246                 cur_block_obj = None
1247         else:
1248             fn_ptr = fn_ptr_regex.match(line)
1249             fn_ret_arr = fn_ret_arr_regex.match(line)
1250             reg_fn = reg_fn_regex.match(line)
1251             const_val = const_val_regex.match(line)
1252
1253             if line.startswith("#include <"):
1254                 pass
1255             elif line.startswith("/*"):
1256                 #out_java.write("\t" + line)
1257                 if not line.endswith("*/\n"):
1258                     in_block_comment = True
1259             elif line.startswith("typedef enum "):
1260                 cur_block_obj = line
1261             elif line.startswith("typedef struct "):
1262                 cur_block_obj = line
1263             elif line.startswith("typedef union "):
1264                 cur_block_obj = line
1265             elif line.startswith("typedef "):
1266                 alias_match =  struct_alias_regex.match(line)
1267                 if alias_match.group(1) in result_templ_structs:
1268                     out_java.write("\tpublic static native boolean " + alias_match.group(2) + "_result_ok(long arg);\n")
1269                     out_java.write("\tpublic static native long " + alias_match.group(2) + "_get_inner(long arg);\n")
1270                     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")
1271                     out_c.write("\treturn ((" + alias_match.group(2) + "*)arg)->result_ok;\n")
1272                     out_c.write("}\n")
1273                     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")
1274                     contents_ty = alias_match.group(1).replace("LDKCResultTempl", "LDKCResultPtr")
1275                     res_ty, err_ty = result_ptr_struct_items[contents_ty]
1276                     out_c.write("\t" + alias_match.group(2) + " *val = (" + alias_match.group(2) + "*)arg;\n")
1277                     out_c.write("\tif (val->result_ok) {\n")
1278                     if res_ty not in opaque_structs:
1279                         out_c.write("\t\treturn (long)val->contents.result;\n")
1280                     else:
1281                         out_c.write("\t\treturn (long)(val->contents.result->inner) | (val->contents.result->is_owned ? 1 : 0);\n")
1282                     out_c.write("\t} else {\n")
1283                     if err_ty not in opaque_structs:
1284                         out_c.write("\t\treturn (long)val->contents.err;\n")
1285                     else:
1286                         out_c.write("\t\treturn (long)(val->contents.err->inner) | (val->contents.err->is_owned ? 1 : 0);\n")
1287                     out_c.write("\t}\n}\n")
1288                 pass
1289             elif fn_ptr is not None:
1290                 map_fn(line, fn_ptr, None, None)
1291             elif fn_ret_arr is not None:
1292                 map_fn(line, fn_ret_arr, fn_ret_arr.group(4), None)
1293             elif reg_fn is not None:
1294                 map_fn(line, reg_fn, None, None)
1295             elif const_val_regex is not None:
1296                 # TODO Map const variables
1297                 pass
1298             else:
1299                 assert(line == "\n")
1300
1301     out_java.write("}\n")
1302     for struct_name in opaque_structs:
1303         with open(sys.argv[3] + "/structs/" + struct_name.replace("LDK","") + ".java", "a") as out_java_struct:
1304             out_java_struct.write("}\n")
1305     for struct_name in trait_structs:
1306         with open(sys.argv[3] + "/structs/" + struct_name.replace("LDK","") + ".java", "a") as out_java_struct:
1307             out_java_struct.write("}\n")