_ 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/enums/ /path/to/bindings/output.c debug")
   6     print("debug should be true or false and indicates whether to track allocations and ensure we don't leak")
   7     sys.exit(1)
   8
   9 class TypeInfo:
  10     def __init__(self, rust_obj, java_ty, java_fn_ty_arg, c_ty, passed_as_ptr, is_ptr, var_name, arr_len, arr_access):
  11         self.rust_obj = rust_obj
  12         self.java_ty = java_ty
  13         self.java_fn_ty_arg = java_fn_ty_arg
  14         self.c_ty = c_ty
  15         self.passed_as_ptr = passed_as_ptr
  16         self.is_ptr = is_ptr
  17         self.var_name = var_name
  18         self.arr_len = arr_len
  19         self.arr_access = arr_access
  20
  21 class ConvInfo:
  22     def __init__(self, ty_info, arg_name, arg_conv, arg_conv_name, ret_conv, ret_conv_name):
  23         assert(ty_info.c_ty is not None)
  24         assert(ty_info.java_ty is not None)
  25         assert(arg_name is not None)
  26         self.passed_as_ptr = ty_info.passed_as_ptr
  27         self.rust_obj = ty_info.rust_obj
  28         self.c_ty = ty_info.c_ty
  29         self.java_ty = ty_info.java_ty
  30         self.java_fn_ty_arg = ty_info.java_fn_ty_arg
  31         self.arg_name = arg_name
  32         self.arg_conv = arg_conv
  33         self.arg_conv_name = arg_conv_name
  34         self.ret_conv = ret_conv
  35         self.ret_conv_name = ret_conv_name
  36
  37     def print_ty(self):
  38         out_c.write(self.c_ty)
  39         out_java.write(self.java_ty)
  40
  41     def print_name(self):
  42         if self.arg_name != "":
  43             out_java.write(" " + self.arg_name)
  44             out_c.write(" " + self.arg_name)
  45         else:
  46             out_java.write(" arg")
  47             out_c.write(" arg")
  48 fn_ptr_regex = re.compile("^extern const ([A-Za-z_0-9\* ]*) \(\*(.*)\)\((.*)\);$")
  49 fn_ret_arr_regex = re.compile("(.*) \(\*(.*)\((.*)\)\)\[([0-9]*)\];$")
  50 reg_fn_regex = re.compile("([A-Za-z_0-9\* ]* \*?)([a-zA-Z_0-9]*)\((.*)\);$")
  51 clone_fns = set()
  52 with open(sys.argv[1]) as in_h:
  53     for line in in_h:
  54         reg_fn = reg_fn_regex.match(line)
  55         if reg_fn is not None:
  56             if reg_fn.group(2).endswith("_clone"):
  57                 clone_fns.add(reg_fn.group(2))
  58             continue
  59         arr_fn = fn_ret_arr_regex.match(line)
  60         if arr_fn is not None:
  61             if arr_fn.group(2).endswith("_clone"):
  62                 clone_fns.add(arr_fn.group(2))
  63             continue
  64
  65 with open(sys.argv[1]) as in_h, open(sys.argv[2], "w") as out_java, open(sys.argv[4], "w") as out_c:
  66     opaque_structs = set()
  67     trait_structs = set()
  68     unitary_enums = set()
  69
  70     def camel_to_snake(s):
  71         # Convert camel case to snake case, in a way that appears to match cbindgen
  72         con = "_"
  73         ret = ""
  74         lastchar = ""
  75         lastund = False
  76         for char in s:
  77             if lastchar.isupper():
  78                 if not char.isupper() and not lastund:
  79                     ret = ret + "_"
  80                     lastund = True
  81                 else:
  82                     lastund = False
  83                 ret = ret + lastchar.lower()
  84             else:
  85                 ret = ret + lastchar
  86                 if char.isupper() and not lastund:
  87                     ret = ret + "_"
  88                     lastund = True
  89                 else:
  90                     lastund = False
  91             lastchar = char
  92             if char.isnumeric():
  93                 lastund = True
  94         return (ret + lastchar.lower()).strip("_")
  95
  96     var_is_arr_regex = re.compile("\(\*([A-za-z0-9_]*)\)\[([0-9]*)\]")
  97     var_ty_regex = re.compile("([A-za-z_0-9]*)(.*)")
  98     def java_c_types(fn_arg, ret_arr_len):
  99         fn_arg = fn_arg.strip()
 100         if fn_arg.startswith("MUST_USE_RES "):
 101             fn_arg = fn_arg[13:]
 102         is_const = False
 103         if fn_arg.startswith("const "):
 104             fn_arg = fn_arg[6:]
 105             is_const = True
 106
 107         is_ptr = False
 108         take_by_ptr = False
 109         rust_obj = None
 110         arr_access = None
 111         if fn_arg.startswith("LDKThirtyTwoBytes"):
 112             fn_arg = "uint8_t (*" + fn_arg[18:] + ")[32]"
 113             assert var_is_arr_regex.match(fn_arg[8:])
 114             rust_obj = "LDKThirtyTwoBytes"
 115             arr_access = "data"
 116         if fn_arg.startswith("LDKPublicKey"):
 117             fn_arg = "uint8_t (*" + fn_arg[13:] + ")[33]"
 118             assert var_is_arr_regex.match(fn_arg[8:])
 119             rust_obj = "LDKPublicKey"
 120             arr_access = "compressed_form"
 121         #if fn_arg.startswith("LDKSignature"):
 122         #    fn_arg = "uint8_t (*" + fn_arg[13:] + ")[64]"
 123         #    assert var_is_arr_regex.match(fn_arg[8:])
 124         #    rust_obj = "LDKSignature"
 125
 126         if fn_arg.startswith("void"):
 127             java_ty = "void"
 128             c_ty = "void"
 129             fn_ty_arg = "V"
 130             fn_arg = fn_arg[4:].strip()
 131         elif fn_arg.startswith("bool"):
 132             java_ty = "boolean"
 133             c_ty = "jboolean"
 134             fn_ty_arg = "Z"
 135             fn_arg = fn_arg[4:].strip()
 136         elif fn_arg.startswith("uint8_t"):
 137             java_ty = "byte"
 138             c_ty = "jbyte"
 139             fn_ty_arg = "B"
 140             fn_arg = fn_arg[7:].strip()
 141         elif fn_arg.startswith("uint16_t"):
 142             java_ty = "short"
 143             c_ty = "jshort"
 144             fn_ty_arg = "S"
 145             fn_arg = fn_arg[8:].strip()
 146         elif fn_arg.startswith("uint32_t"):
 147             java_ty = "int"
 148             c_ty = "jint"
 149             fn_ty_arg = "I"
 150             fn_arg = fn_arg[8:].strip()
 151         elif fn_arg.startswith("uint64_t") or fn_arg.startswith("uintptr_t"):
 152             java_ty = "long"
 153             c_ty = "jlong"
 154             fn_ty_arg = "J"
 155             if fn_arg.startswith("uint64_t"):
 156                 fn_arg = fn_arg[8:].strip()
 157             else:
 158                 fn_arg = fn_arg[9:].strip()
 159         elif is_const and fn_arg.startswith("char *"):
 160             java_ty = "String"
 161             c_ty = "const char*"
 162             fn_ty_arg = "Ljava/lang/String;"
 163             fn_arg = fn_arg[6:].strip()
 164         else:
 165             ma = var_ty_regex.match(fn_arg)
 166             if ma.group(1).strip() in unitary_enums:
 167                 java_ty = ma.group(1).strip()
 168                 c_ty = "jclass"
 169                 fn_ty_arg = "Lorg/ldk/enums/" + ma.group(1).strip() + ";"
 170                 fn_arg = ma.group(2).strip()
 171                 rust_obj = ma.group(1).strip()
 172                 take_by_ptr = True
 173             else:
 174                 java_ty = "long"
 175                 c_ty = "jlong"
 176                 fn_ty_arg = "J"
 177                 fn_arg = ma.group(2).strip()
 178                 rust_obj = ma.group(1).strip()
 179                 take_by_ptr = True
 180
 181         if fn_arg.startswith(" *") or fn_arg.startswith("*"):
 182             fn_arg = fn_arg.replace("*", "").strip()
 183             is_ptr = True
 184             c_ty = "jlong"
 185             java_ty = "long"
 186             fn_ty_arg = "J"
 187
 188         var_is_arr = var_is_arr_regex.match(fn_arg)
 189         if var_is_arr is not None or ret_arr_len is not None:
 190             assert(not take_by_ptr)
 191             assert(not is_ptr)
 192             java_ty = java_ty + "[]"
 193             c_ty = c_ty + "Array"
 194             if var_is_arr is not None:
 195                 if var_is_arr.group(1) == "":
 196                     return TypeInfo(rust_obj=rust_obj, java_ty=java_ty, java_fn_ty_arg="[" + fn_ty_arg, c_ty=c_ty,
 197                         passed_as_ptr=False, is_ptr=False, var_name="arg", arr_len=var_is_arr.group(2), arr_access=arr_access)
 198                 return TypeInfo(rust_obj=rust_obj, java_ty=java_ty, java_fn_ty_arg="[" + fn_ty_arg, c_ty=c_ty,
 199                     passed_as_ptr=False, is_ptr=False, var_name=var_is_arr.group(1), arr_len=var_is_arr.group(2), arr_access=arr_access)
 200         return TypeInfo(rust_obj=rust_obj, java_ty=java_ty, java_fn_ty_arg=fn_ty_arg, c_ty=c_ty, passed_as_ptr=is_ptr or take_by_ptr,
 201             is_ptr=is_ptr, var_name=fn_arg, arr_len=None, arr_access=None)
 202
 203     def map_type(fn_arg, print_void, ret_arr_len, is_free):
 204         ty_info = java_c_types(fn_arg, ret_arr_len)
 205
 206         if ty_info.c_ty == "void":
 207             if not print_void:
 208                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 209                     arg_conv = None, arg_conv_name = None, ret_conv = None, ret_conv_name = None)
 210
 211         if ty_info.c_ty.endswith("Array"):
 212             arr_len = ty_info.arr_len
 213             if arr_len is not None:
 214                 arr_name = ty_info.var_name
 215             else:
 216                 arr_name = "ret"
 217                 arr_len = ret_arr_len
 218             assert(ty_info.c_ty == "jbyteArray")
 219             if ty_info.rust_obj is not None:
 220                 arg_conv = ty_info.rust_obj + " " + arr_name + "_ref;\n" + "(*_env)->GetByteArrayRegion (_env, " + arr_name + ", 0, " + arr_len + ", " + arr_name + "_ref." + ty_info.arr_access + ");"
 221                 arr_access = ("", "." + ty_info.arr_access)
 222             else:
 223                 arg_conv = "unsigned char " + arr_name + "_arr[" + arr_len + "];\n" + "(*_env)->GetByteArrayRegion (_env, " + arr_name + ", 0, " + arr_len + ", " + arr_name + "_arr);\n" + "unsigned char (*" + arr_name + "_ref)[" + arr_len + "] = &" + arr_name + "_arr;"
 224                 arr_access = ("*", "")
 225             return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 226                 arg_conv = arg_conv,
 227                 arg_conv_name = arr_name + "_ref",
 228                 ret_conv = ("jbyteArray " + arr_name + "_arr = (*_env)->NewByteArray(_env, " + arr_len + ");\n" +
 229                     "(*_env)->SetByteArrayRegion(_env, " + arr_name + "_arr, 0, " + arr_len + ", " + arr_access[0],
 230                     arr_access[1] + ");"),
 231                 ret_conv_name = arr_name + "_arr")
 232         elif ty_info.var_name != "":
 233             # If we have a parameter name, print it (noting that it may indicate its a pointer)
 234             if ty_info.rust_obj is not None:
 235                 assert(ty_info.passed_as_ptr)
 236                 opaque_arg_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv;\n"
 237                 opaque_arg_conv = opaque_arg_conv + ty_info.var_name + "_conv.inner = (void*)(" + ty_info.var_name + " & (~1));\n"
 238                 opaque_arg_conv = opaque_arg_conv + ty_info.var_name + "_conv.is_owned = (" + ty_info.var_name + " & 1) || (" + ty_info.var_name + " == 0);"
 239                 if (ty_info.rust_obj.replace("LDK", "") + "_clone") in clone_fns and not ty_info.is_ptr and not is_free:
 240                     # TODO: This is a bit too naive, even with the checks above, we really need to know if rust wants a ref or not, not just if its pass as a ptr.
 241                     opaque_arg_conv = opaque_arg_conv + "\nif (" + ty_info.var_name + "_conv.inner != NULL)\n"
 242                     opaque_arg_conv = opaque_arg_conv + "\t" + ty_info.var_name + "_conv = " + ty_info.rust_obj.replace("LDK", "") + "_clone(&" + ty_info.var_name + "_conv);"
 243                 if not ty_info.is_ptr:
 244                     if ty_info.rust_obj in unitary_enums:
 245                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 246                             arg_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv = " + ty_info.rust_obj + "_from_java(_env, " + ty_info.var_name + ");",
 247                             arg_conv_name = ty_info.var_name + "_conv",
 248                             ret_conv = ("jclass " + ty_info.var_name + "_conv = " + ty_info.rust_obj + "_to_java(_env, ", ");"),
 249                             ret_conv_name = ty_info.var_name + "_conv")
 250                     if ty_info.rust_obj in opaque_structs:
 251                         ret_conv_suf = ";\nDO_ASSERT((((long)" + ty_info.var_name + "_var.inner) & 1) == 0); // We rely on a free low bit, malloc guarantees this.\n"
 252                         ret_conv_suf = ret_conv_suf + "DO_ASSERT((((long)&" + ty_info.var_name + "_var) & 1) == 0); // We rely on a free low bit, pointer alignment guarantees this.\n"
 253                         ret_conv_suf = ret_conv_suf + "long " + ty_info.var_name + "_ref;\n"
 254                         ret_conv_suf = ret_conv_suf + "if (" + ty_info.var_name + "_var.is_owned) {\n"
 255                         ret_conv_suf = ret_conv_suf + "\t" + ty_info.var_name + "_ref = (long)" + ty_info.var_name + "_var.inner | 1;\n"
 256                         ret_conv_suf = ret_conv_suf + "} else {\n"
 257                         ret_conv_suf = ret_conv_suf + "\t" + ty_info.var_name + "_ref = (long)&" + ty_info.var_name + "_var;\n"
 258                         ret_conv_suf = ret_conv_suf + "}"
 259                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 260                             arg_conv = opaque_arg_conv, arg_conv_name = ty_info.var_name + "_conv",
 261                             ret_conv = (ty_info.rust_obj + " " + ty_info.var_name + "_var = ", ret_conv_suf),
 262                             ret_conv_name = ty_info.var_name + "_ref")
 263                     base_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv = *(" + ty_info.rust_obj + "*)" + ty_info.var_name + ";";
 264                     if ty_info.rust_obj in trait_structs:
 265                         if not is_free:
 266                             base_conv = base_conv + "\nif (" + ty_info.var_name + "_conv.free == " + ty_info.rust_obj + "_JCalls_free) {\n"
 267                             base_conv = base_conv + "\t// If this_arg is a JCalls struct, then we need to increment the refcnt in it.\n"
 268                             base_conv = base_conv + "\t" + ty_info.rust_obj + "_JCalls_clone(" + ty_info.var_name + "_conv.this_arg);\n}"
 269                         else:
 270                             base_conv = base_conv + "\n" + "FREE((void*)" + ty_info.var_name + ");"
 271                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 272                             arg_conv = base_conv,
 273                             arg_conv_name = ty_info.var_name + "_conv",
 274                             ret_conv = ("CANT PASS TRAIT TO Java?", ""), ret_conv_name = "NO CONV POSSIBLE")
 275                     if ty_info.rust_obj != "LDKu8slice":
 276                         # Don't bother free'ing slices passed in - Rust doesn't auto-free the
 277                         # underlying unlike Vecs, and it gives Java more freedom.
 278                         base_conv = base_conv + "\nFREE((void*)" + ty_info.var_name + ");";
 279                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 280                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv",
 281                         ret_conv = ("long " + ty_info.var_name + "_ref = (long)&", ";"), ret_conv_name = ty_info.var_name + "_ref")
 282                 else:
 283                     assert(not is_free)
 284                     if ty_info.rust_obj in opaque_structs:
 285                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 286                             arg_conv = opaque_arg_conv, arg_conv_name = "&" + ty_info.var_name + "_conv",
 287                             ret_conv = None, ret_conv_name = None) # its a pointer, no conv needed
 288                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 289                         arg_conv = ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)" + ty_info.var_name + ";",
 290                         arg_conv_name = ty_info.var_name + "_conv",
 291                         ret_conv = None, ret_conv_name = None) # its a pointer, no conv needed
 292             elif ty_info.is_ptr:
 293                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 294                     arg_conv = None, arg_conv_name = ty_info.var_name, ret_conv = None, ret_conv_name = None)
 295             elif ty_info.java_ty == "String":
 296                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 297                     arg_conv = None, arg_conv_name = None,
 298                     ret_conv = ("jstring " + ty_info.var_name + "_conv = (*_env)->NewStringUTF(_env, ", ");"), ret_conv_name = ty_info.var_name + "_conv")
 299             else:
 300                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 301                     arg_conv = None, arg_conv_name = ty_info.var_name, ret_conv = None, ret_conv_name = None)
 302         elif not print_void:
 303             # We don't have a parameter name, and want one, just call it arg
 304             if ty_info.rust_obj is not None:
 305                 assert(not is_free or ty_info.rust_obj not in opaque_structs);
 306                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 307                     arg_conv = ty_info.rust_obj + " arg_conv = *(" + ty_info.rust_obj + "*)arg;\nFREE((void*)arg);",
 308                     arg_conv_name = "arg_conv",
 309                     ret_conv = None, ret_conv_name = None)
 310             else:
 311                 assert(not is_free)
 312                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 313                     arg_conv = None, arg_conv_name = "arg", ret_conv = None, ret_conv_name = None)
 314         else:
 315             # We don't have a parameter name, and don't want one (cause we're returning)
 316             if ty_info.rust_obj is not None:
 317                 if not ty_info.is_ptr:
 318                     if ty_info.rust_obj in unitary_enums:
 319                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 320                             arg_conv = ty_info.rust_obj + " ret = " + ty_info.rust_obj + "_from_java(_env, " + ty_info.var_name + ");",
 321                             arg_conv_name = "ret",
 322                             ret_conv = ("jclass ret = " + ty_info.rust_obj + "_to_java(_env, ", ");"), ret_conv_name = "ret")
 323                     if ty_info.rust_obj in opaque_structs:
 324                         # If we're returning a newly-allocated struct, we don't want Rust to ever
 325                         # free, instead relying on the Java GC to lose the ref. We undo this in
 326                         # any _free function.
 327                         # To avoid any issues, we first assert that the incoming object is non-ref.
 328                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 329                             ret_conv = (ty_info.rust_obj + " ret = ", ";"),
 330                             ret_conv_name = "((long)ret.inner) | (ret.is_owned ? 1 : 0)",
 331                             arg_conv = None, arg_conv_name = None)
 332                     else:
 333                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 334                             ret_conv = (ty_info.rust_obj + "* ret = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n*ret = ", ";"),
 335                             ret_conv_name = "(long)ret",
 336                             arg_conv = None, arg_conv_name = None)
 337                 else:
 338                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 339                         ret_conv = ("long ret = (long)", ";"), ret_conv_name = "ret",
 340                         arg_conv = None, arg_conv_name = None)
 341             else:
 342                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 343                     arg_conv = None, arg_conv_name = None, ret_conv = None, ret_conv_name = None)
 344
 345     def map_fn(line, re_match, ret_arr_len, c_call_string):
 346         out_java.write("\t// " + line)
 347         out_java.write("\tpublic static native ")
 348         out_c.write("JNIEXPORT ")
 349
 350         ret_info = map_type(re_match.group(1), True, ret_arr_len, False)
 351         ret_info.print_ty()
 352         if ret_info.ret_conv is not None:
 353             ret_conv_pfx, ret_conv_sfx = ret_info.ret_conv
 354
 355         out_java.write(" " + re_match.group(2) + "(")
 356         out_c.write(" JNICALL Java_org_ldk_impl_bindings_" + re_match.group(2).replace('_', '_1') + "(JNIEnv * _env, jclass _b")
 357
 358         arg_names = []
 359         for idx, arg in enumerate(re_match.group(3).split(',')):
 360             if idx != 0:
 361                 out_java.write(", ")
 362             if arg != "void":
 363                 out_c.write(", ")
 364             arg_conv_info = map_type(arg, False, None, re_match.group(2).endswith("_free"))
 365             if arg_conv_info.c_ty != "void":
 366                 arg_conv_info.print_ty()
 367                 arg_conv_info.print_name()
 368             arg_names.append(arg_conv_info)
 369
 370         out_java.write(");\n")
 371         out_c.write(") {\n")
 372
 373         for info in arg_names:
 374             if info.arg_conv is not None:
 375                 out_c.write("\t" + info.arg_conv.replace('\n', "\n\t") + "\n");
 376
 377         if ret_info.ret_conv is not None:
 378             out_c.write("\t" + ret_conv_pfx.replace('\n', '\n\t'));
 379         else:
 380             out_c.write("\treturn ");
 381
 382         if c_call_string is None:
 383             out_c.write(re_match.group(2) + "(")
 384         else:
 385             out_c.write(c_call_string)
 386         for idx, info in enumerate(arg_names):
 387             if info.arg_conv_name is not None:
 388                 if idx != 0:
 389                     out_c.write(", ")
 390                 elif c_call_string is not None:
 391                     continue
 392                 out_c.write(info.arg_conv_name)
 393         out_c.write(")")
 394         if ret_info.ret_conv is not None:
 395             out_c.write(ret_conv_sfx.replace('\n', '\n\t'))
 396             out_c.write("\n\treturn " + ret_info.ret_conv_name + ";")
 397         else:
 398             out_c.write(";")
 399         out_c.write("\n}\n\n")
 400
 401     def map_unitary_enum(struct_name, field_lines):
 402         with open(sys.argv[3] + "/" + struct_name + ".java", "w") as out_java_enum:
 403             out_java_enum.write("package org.ldk.enums;\n\n")
 404             unitary_enums.add(struct_name)
 405             out_c.write("static inline " + struct_name + " " + struct_name + "_from_java(JNIEnv *env, jclass val) {\n")
 406             out_c.write("\tswitch ((*env)->CallIntMethod(env, val, ordinal_meth)) {\n")
 407             ord_v = 0
 408             for idx, struct_line in enumerate(field_lines):
 409                 if idx == 0:
 410                     out_java_enum.write("public enum " + struct_name + " {\n")
 411                 elif idx == len(field_lines) - 3:
 412                     assert(struct_line.endswith("_Sentinel,"))
 413                 elif idx == len(field_lines) - 2:
 414                     out_java_enum.write("\t; static native void init();\n")
 415                     out_java_enum.write("\tstatic { init(); }\n")
 416                     out_java_enum.write("}")
 417                     out_java.write("\tstatic { " + struct_name + ".values(); /* Force enum statics to run */ }\n")
 418                 elif idx == len(field_lines) - 1:
 419                     assert(struct_line == "")
 420                 else:
 421                     out_java_enum.write(struct_line + "\n")
 422                     out_c.write("\t\tcase %d: return %s;\n" % (ord_v, struct_line.strip().strip(",")))
 423                     ord_v = ord_v + 1
 424             out_c.write("\t}\n")
 425             out_c.write("\tabort();\n")
 426             out_c.write("}\n")
 427
 428             ord_v = 0
 429             out_c.write("static jclass " + struct_name + "_class = NULL;\n")
 430             for idx, struct_line in enumerate(field_lines):
 431                 if idx > 0 and idx < len(field_lines) - 3:
 432                     variant = struct_line.strip().strip(",")
 433                     out_c.write("static jfieldID " + struct_name + "_" + variant + " = NULL;\n")
 434             out_c.write("JNIEXPORT void JNICALL Java_org_ldk_enums_" + struct_name.replace("_", "_1") + "_init (JNIEnv * env, jclass clz) {\n")
 435             out_c.write("\t" + struct_name + "_class = (*env)->NewGlobalRef(env, clz);\n")
 436             out_c.write("\tDO_ASSERT(" + struct_name + "_class != NULL);\n")
 437             for idx, struct_line in enumerate(field_lines):
 438                 if idx > 0 and idx < len(field_lines) - 3:
 439                     variant = struct_line.strip().strip(",")
 440                     out_c.write("\t" + struct_name + "_" + variant + " = (*env)->GetStaticFieldID(env, " + struct_name + "_class, \"" + variant + "\", \"Lorg/ldk/enums/" + struct_name + ";\");\n")
 441                     out_c.write("\tDO_ASSERT(" + struct_name + "_" + variant + " != NULL);\n")
 442             out_c.write("}\n")
 443             out_c.write("static inline jclass " + struct_name + "_to_java(JNIEnv *env, " + struct_name + " val) {\n")
 444             out_c.write("\tswitch (val) {\n")
 445             for idx, struct_line in enumerate(field_lines):
 446                 if idx > 0 and idx < len(field_lines) - 3:
 447                     variant = struct_line.strip().strip(",")
 448                     out_c.write("\t\tcase " + variant + ":\n")
 449                     out_c.write("\t\t\treturn (*env)->GetStaticObjectField(env, " + struct_name + "_class, " + struct_name + "_" + variant + ");\n")
 450                     ord_v = ord_v + 1
 451             out_c.write("\t\tdefault: abort();\n")
 452             out_c.write("\t}\n")
 453             out_c.write("}\n\n")
 454
 455     def map_complex_enum(struct_name, union_enum_items):
 456         tag_field_lines = union_enum_items["field_lines"]
 457         init_meth_jty_strs = {}
 458         for idx, struct_line in enumerate(tag_field_lines):
 459             if idx == 0:
 460                 out_java.write("\tpublic static class " + struct_name + " {\n")
 461                 out_java.write("\t\tprivate " + struct_name + "() {}\n")
 462             elif idx == len(tag_field_lines) - 3:
 463                 assert(struct_line.endswith("_Sentinel,"))
 464             elif idx == len(tag_field_lines) - 2:
 465                 out_java.write("\t\tstatic native void init();\n")
 466                 out_java.write("\t}\n")
 467             elif idx == len(tag_field_lines) - 1:
 468                 assert(struct_line == "")
 469             else:
 470                 var_name = struct_line.strip(' ,')[len(struct_name) + 1:]
 471                 out_java.write("\t\tpublic final static class " + var_name + " extends " + struct_name + " {\n")
 472                 out_c.write("static jclass " + struct_name + "_" + var_name + "_class = NULL;\n")
 473                 out_c.write("static jmethodID " + struct_name + "_" + var_name + "_meth = NULL;\n")
 474                 init_meth_jty_str = ""
 475                 init_meth_params = ""
 476                 init_meth_body = ""
 477                 if "LDK" + var_name in union_enum_items:
 478                     enum_var_lines = union_enum_items["LDK" + var_name]
 479                     for idx, field in enumerate(enum_var_lines):
 480                         if idx != 0 and idx < len(enum_var_lines) - 2:
 481                             field_ty = java_c_types(field.strip(' ;'), None)
 482                             out_java.write("\t\t\tpublic " + field_ty.java_ty + " " + field_ty.var_name + ";\n")
 483                             init_meth_jty_str = init_meth_jty_str + field_ty.java_fn_ty_arg
 484                             if idx > 1:
 485                                 init_meth_params = init_meth_params + ", "
 486                             init_meth_params = init_meth_params + field_ty.java_ty + " " + field_ty.var_name
 487                             init_meth_body = init_meth_body + "this." + field_ty.var_name + " = " + field_ty.var_name + "; "
 488                     out_java.write("\t\t\t" + var_name + "(" + init_meth_params + ") { ")
 489                     out_java.write(init_meth_body)
 490                     out_java.write("}\n")
 491                 out_java.write("\t\t}\n")
 492                 init_meth_jty_strs[var_name] = init_meth_jty_str
 493         out_java.write("\tstatic { " + struct_name + ".init(); }\n")
 494         out_java.write("\tpublic static native " + struct_name + " " + struct_name + "_ref_from_ptr(long ptr);\n");
 495
 496         out_c.write("JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_00024" + struct_name.replace("_", "_1") + "_init (JNIEnv * env, jclass _a) {\n")
 497         for idx, struct_line in enumerate(tag_field_lines):
 498             if idx != 0 and idx < len(tag_field_lines) - 3:
 499                 var_name = struct_line.strip(' ,')[len(struct_name) + 1:]
 500                 out_c.write("\t" + struct_name + "_" + var_name + "_class =\n")
 501                 out_c.write("\t\t(*env)->NewGlobalRef(env, (*env)->FindClass(env, \"Lorg/ldk/impl/bindings$" + struct_name + "$" + var_name + ";\"));\n")
 502                 out_c.write("\tDO_ASSERT(" + struct_name + "_" + var_name + "_class != NULL);\n")
 503                 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")
 504                 out_c.write("\tDO_ASSERT(" + struct_name + "_" + var_name + "_meth != NULL);\n")
 505         out_c.write("}\n")
 506         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")
 507         out_c.write("\t" + struct_name + " *obj = (" + struct_name + "*)ptr;\n")
 508         out_c.write("\tswitch(obj->tag) {\n")
 509         for idx, struct_line in enumerate(tag_field_lines):
 510             if idx != 0 and idx < len(tag_field_lines) - 3:
 511                 var_name = struct_line.strip(' ,')[len(struct_name) + 1:]
 512                 out_c.write("\t\tcase " + struct_name + "_" + var_name + ": {\n")
 513                 c_params_text = ""
 514                 if "LDK" + var_name in union_enum_items:
 515                     enum_var_lines = union_enum_items["LDK" + var_name]
 516                     for idx, field in enumerate(enum_var_lines):
 517                         if idx != 0 and idx < len(enum_var_lines) - 2:
 518                             field_map = map_type(field.strip(' ;'), False, None, False)
 519                             if field_map.ret_conv is not None:
 520                                 out_c.write("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t").replace("_env", "env"))
 521                                 out_c.write("obj->" + camel_to_snake(var_name) + "." + field_map.arg_name)
 522                                 out_c.write(field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
 523                                 c_params_text = c_params_text + ", " + field_map.ret_conv_name
 524                             else:
 525                                 c_params_text = c_params_text + ", obj->" + camel_to_snake(var_name) + "." + field_map.arg_name
 526                 out_c.write("\t\t\treturn (*env)->NewObject(env, " + struct_name + "_" + var_name + "_class, " + struct_name + "_" + var_name + "_meth" + c_params_text + ");\n")
 527                 out_c.write("\t\t}\n")
 528         out_c.write("\t\tdefault: abort();\n")
 529         out_c.write("\t}\n}\n")
 530
 531     def map_trait(struct_name, field_var_lines, trait_fn_lines):
 532         out_c.write("typedef struct " + struct_name + "_JCalls {\n")
 533         out_c.write("\tatomic_size_t refcnt;\n")
 534         out_c.write("\tJavaVM *vm;\n")
 535         out_c.write("\tjweak o;\n")
 536         for var_line in field_var_lines:
 537             if var_line.group(1) in trait_structs:
 538                 out_c.write("\t" + var_line.group(1) + "_JCalls* " + var_line.group(2) + ";\n")
 539         for fn_line in trait_fn_lines:
 540             if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
 541                 out_c.write("\tjmethodID " + fn_line.group(2) + "_meth;\n")
 542         out_c.write("} " + struct_name + "_JCalls;\n")
 543
 544         out_java.write("\tpublic interface " + struct_name + " {\n")
 545         java_meths = []
 546         for fn_line in trait_fn_lines:
 547             java_meth_descr = "("
 548             if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
 549                 ret_ty_info = java_c_types(fn_line.group(1), None)
 550
 551                 out_java.write("\t\t " + ret_ty_info.java_ty + " " + fn_line.group(2) + "(")
 552                 is_const = fn_line.group(3) is not None
 553                 out_c.write(fn_line.group(1) + fn_line.group(2) + "_jcall(")
 554                 if is_const:
 555                     out_c.write("const void* this_arg")
 556                 else:
 557                     out_c.write("void* this_arg")
 558
 559                 arg_names = []
 560                 for idx, arg in enumerate(fn_line.group(4).split(',')):
 561                     if arg == "":
 562                         continue
 563                     if idx >= 2:
 564                         out_java.write(", ")
 565                     out_c.write(", ")
 566                     arg_conv_info = map_type(arg, True, None, False)
 567                     out_c.write(arg.strip())
 568                     out_java.write(arg_conv_info.java_ty + " " + arg_conv_info.arg_name)
 569                     arg_names.append(arg_conv_info)
 570                     java_meth_descr = java_meth_descr + arg_conv_info.java_fn_ty_arg
 571                 java_meth_descr = java_meth_descr + ")" + ret_ty_info.java_fn_ty_arg
 572                 java_meths.append(java_meth_descr)
 573
 574                 out_java.write(");\n")
 575                 out_c.write(") {\n")
 576                 out_c.write("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
 577                 out_c.write("\tJNIEnv *env;\n")
 578                 out_c.write("\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_8) == JNI_OK);\n")
 579
 580                 for arg_info in arg_names:
 581                     if arg_info.ret_conv is not None:
 582                         out_c.write("\t" + arg_info.ret_conv[0].replace('\n', '\n\t').replace("_env", "env"));
 583                         out_c.write(arg_info.arg_name)
 584                         out_c.write(arg_info.ret_conv[1].replace('\n', '\n\t').replace("_env", "env") + "\n")
 585
 586                 out_c.write("\tjobject obj = (*env)->NewLocalRef(env, j_calls->o);\n\tDO_ASSERT(obj != NULL);\n")
 587                 if ret_ty_info.c_ty.endswith("Array"):
 588                     assert(ret_ty_info.c_ty == "jbyteArray")
 589                     out_c.write("\tjbyteArray jret = (*env)->CallObjectMethod(env, obj, j_calls->" + fn_line.group(2) + "_meth")
 590                 elif not ret_ty_info.passed_as_ptr:
 591                     out_c.write("\treturn (*env)->Call" + ret_ty_info.java_ty.title() + "Method(env, obj, j_calls->" + fn_line.group(2) + "_meth")
 592                 else:
 593                     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");
 594
 595                 for arg_info in arg_names:
 596                     if arg_info.ret_conv is not None:
 597                         out_c.write(", " + arg_info.ret_conv_name)
 598                     else:
 599                         out_c.write(", " + arg_info.arg_name)
 600                 out_c.write(");\n");
 601                 if ret_ty_info.c_ty.endswith("Array"):
 602                     out_c.write("\t" + ret_ty_info.rust_obj + " ret;\n")
 603                     out_c.write("\t(*env)->GetByteArrayRegion(env, jret, 0, " + ret_ty_info.arr_len + ", ret." + ret_ty_info.arr_access + ");\n")
 604                     out_c.write("\treturn ret;\n")
 605
 606                 if ret_ty_info.passed_as_ptr:
 607                     out_c.write("\t" + fn_line.group(1).strip() + " res = *ret;\n")
 608                     out_c.write("\tFREE(ret);\n")
 609                     out_c.write("\treturn res;\n")
 610                 out_c.write("}\n")
 611             elif fn_line.group(2) == "free":
 612                 out_c.write("static void " + struct_name + "_JCalls_free(void* this_arg) {\n")
 613                 out_c.write("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
 614                 out_c.write("\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n")
 615                 out_c.write("\t\tJNIEnv *env;\n")
 616                 out_c.write("\t\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_8) == JNI_OK);\n")
 617                 out_c.write("\t\t(*env)->DeleteWeakGlobalRef(env, j_calls->o);\n")
 618                 out_c.write("\t\tFREE(j_calls);\n")
 619                 out_c.write("\t}\n}\n")
 620
 621         # Write out a clone function whether we need one or not, as we use them in moving to rust
 622         out_c.write("static void* " + struct_name + "_JCalls_clone(const void* this_arg) {\n")
 623         out_c.write("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
 624         out_c.write("\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n")
 625         for var_line in field_var_lines:
 626             if var_line.group(1) in trait_structs:
 627                 out_c.write("\tatomic_fetch_add_explicit(&j_calls->" + var_line.group(2) + "->refcnt, 1, memory_order_release);\n")
 628         out_c.write("\treturn (void*) this_arg;\n")
 629         out_c.write("}\n")
 630
 631         out_java.write("\t}\n")
 632
 633         out_java.write("\tpublic static native long " + struct_name + "_new(" + struct_name + " impl")
 634         out_c.write("static inline " + struct_name + " " + struct_name + "_init (JNIEnv * env, jclass _a, jobject o")
 635         for var_line in field_var_lines:
 636             if var_line.group(1) in trait_structs:
 637                 out_java.write(", " + var_line.group(1) + " " + var_line.group(2))
 638                 out_c.write(", jobject " + var_line.group(2))
 639         out_java.write(");\n")
 640         out_c.write(") {\n")
 641
 642         out_c.write("\tjclass c = (*env)->GetObjectClass(env, o);\n")
 643         out_c.write("\tDO_ASSERT(c != NULL);\n")
 644         out_c.write("\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n")
 645         out_c.write("\tatomic_init(&calls->refcnt, 1);\n")
 646         out_c.write("\tDO_ASSERT((*env)->GetJavaVM(env, &calls->vm) == 0);\n")
 647         out_c.write("\tcalls->o = (*env)->NewWeakGlobalRef(env, o);\n")
 648         for (fn_line, java_meth_descr) in zip(trait_fn_lines, java_meths):
 649             if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
 650                 out_c.write("\tcalls->" + fn_line.group(2) + "_meth = (*env)->GetMethodID(env, c, \"" + fn_line.group(2) + "\", \"" + java_meth_descr + "\");\n")
 651                 out_c.write("\tDO_ASSERT(calls->" + fn_line.group(2) + "_meth != NULL);\n")
 652         out_c.write("\n\t" + struct_name + " ret = {\n")
 653         out_c.write("\t\t.this_arg = (void*) calls,\n")
 654         for fn_line in trait_fn_lines:
 655             if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
 656                 out_c.write("\t\t." + fn_line.group(2) + " = " + fn_line.group(2) + "_jcall,\n")
 657             elif fn_line.group(2) == "free":
 658                 out_c.write("\t\t.free = " + struct_name + "_JCalls_free,\n")
 659             else:
 660                 out_c.write("\t\t.clone = " + struct_name + "_JCalls_clone,\n")
 661         for var_line in field_var_lines:
 662             if var_line.group(1) in trait_structs:
 663                 out_c.write("\t\t." + var_line.group(2) + " = " + var_line.group(1) + "_init(env, _a, " + var_line.group(2) + "),\n")
 664         out_c.write("\t};\n")
 665         for var_line in field_var_lines:
 666             if var_line.group(1) in trait_structs:
 667                 out_c.write("\tcalls->" + var_line.group(2) + " = ret." + var_line.group(2) + ".this_arg;\n")
 668         out_c.write("\treturn ret;\n")
 669         out_c.write("}\n")
 670
 671         out_c.write("JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1new (JNIEnv * env, jclass _a, jobject o")
 672         for var_line in field_var_lines:
 673             if var_line.group(1) in trait_structs:
 674                 out_c.write(", jobject " + var_line.group(2))
 675         out_c.write(") {\n")
 676         out_c.write("\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n")
 677         out_c.write("\t*res_ptr = " + struct_name + "_init(env, _a, o")
 678         for var_line in field_var_lines:
 679             if var_line.group(1) in trait_structs:
 680                 out_c.write(", " + var_line.group(2))
 681         out_c.write(");\n")
 682         out_c.write("\treturn (long)res_ptr;\n")
 683         out_c.write("}\n")
 684
 685         out_java.write("\tpublic static native " + struct_name + " " + struct_name + "_get_obj_from_jcalls(long val);\n")
 686         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")
 687         out_c.write("\tjobject ret = (*env)->NewLocalRef(env, ((" + struct_name + "_JCalls*)val)->o);\n")
 688         out_c.write("\tDO_ASSERT(ret != NULL);\n")
 689         out_c.write("\treturn ret;\n")
 690         out_c.write("}\n")
 691
 692         for fn_line in trait_fn_lines:
 693             # For now, just disable enabling the _call_log - we don't know how to inverse-map String
 694             is_log = fn_line.group(2) == "log" and struct_name == "LDKLogger"
 695             if fn_line.group(2) != "free" and fn_line.group(2) != "clone" and fn_line.group(2) != "eq" and not is_log:
 696                 dummy_line = fn_line.group(1) + struct_name + "_call_" + fn_line.group(2) + " " + struct_name + "* arg" + fn_line.group(4) + "\n"
 697                 map_fn(dummy_line, re.compile("([A-Za-z_0-9]*) *([A-Za-z_0-9]*) *(.*)").match(dummy_line), None, "(arg_conv->" + fn_line.group(2) + ")(arg_conv->this_arg")
 698
 699     out_c.write("""#include \"org_ldk_impl_bindings.h\"
 700 #include <rust_types.h>
 701 #include <lightning.h>
 702 #include <string.h>
 703 #include <stdatomic.h>
 704 """)
 705
 706     if sys.argv[4] == "false":
 707         out_c.write("#define MALLOC(a, _) malloc(a)\n")
 708         out_c.write("#define FREE free\n")
 709         out_c.write("#define DO_ASSERT(a) (void)(a)\n")
 710     else:
 711         out_c.write("""#include <assert.h>
 712 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
 713
 714 // Running a leak check across all the allocations and frees of the JDK is a mess,
 715 // so instead we implement our own naive leak checker here, relying on the -wrap
 716 // linker option to wrap malloc/calloc/realloc/free, tracking everyhing allocated
 717 // and free'd in Rust or C across the generated bindings shared library.
 718 #include <threads.h>
 719 #include <execinfo.h>
 720 #include <unistd.h>
 721 static mtx_t allocation_mtx;
 722
 723 void __attribute__((constructor)) init_mtx() {
 724         DO_ASSERT(mtx_init(&allocation_mtx, mtx_plain) == thrd_success);
 725 }
 726
 727 #define BT_MAX 128
 728 typedef struct allocation {
 729         struct allocation* next;
 730         void* ptr;
 731         const char* struct_name;
 732         void* bt[BT_MAX];
 733         int bt_len;
 734 } allocation;
 735 static allocation* allocation_ll = NULL;
 736
 737 void* __real_malloc(size_t len);
 738 void* __real_calloc(size_t nmemb, size_t len);
 739 static void new_allocation(void* res, const char* struct_name) {
 740         allocation* new_alloc = __real_malloc(sizeof(allocation));
 741         new_alloc->ptr = res;
 742         new_alloc->struct_name = struct_name;
 743         new_alloc->bt_len = backtrace(new_alloc->bt, BT_MAX);
 744         DO_ASSERT(mtx_lock(&allocation_mtx) == thrd_success);
 745         new_alloc->next = allocation_ll;
 746         allocation_ll = new_alloc;
 747         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
 748 }
 749 static void* MALLOC(size_t len, const char* struct_name) {
 750         void* res = __real_malloc(len);
 751         new_allocation(res, struct_name);
 752         return res;
 753 }
 754 void __real_free(void* ptr);
 755 static void alloc_freed(void* ptr) {
 756         allocation* p = NULL;
 757         DO_ASSERT(mtx_lock(&allocation_mtx) == thrd_success);
 758         allocation* it = allocation_ll;
 759         while (it->ptr != ptr) { p = it; it = it->next; }
 760         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
 761         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
 762         DO_ASSERT(it->ptr == ptr);
 763         __real_free(it);
 764 }
 765 static void FREE(void* ptr) {
 766         alloc_freed(ptr);
 767         __real_free(ptr);
 768 }
 769
 770 void* __wrap_malloc(size_t len) {
 771         void* res = __real_malloc(len);
 772         new_allocation(res, "malloc call");
 773         return res;
 774 }
 775 void* __wrap_calloc(size_t nmemb, size_t len) {
 776         void* res = __real_calloc(nmemb, len);
 777         new_allocation(res, "calloc call");
 778         return res;
 779 }
 780 void __wrap_free(void* ptr) {
 781         alloc_freed(ptr);
 782         __real_free(ptr);
 783 }
 784
 785 void* __real_realloc(void* ptr, size_t newlen);
 786 void* __wrap_realloc(void* ptr, size_t len) {
 787         alloc_freed(ptr);
 788         void* res = __real_realloc(ptr, len);
 789         new_allocation(res, "realloc call");
 790         return res;
 791 }
 792 void __wrap_reallocarray(void* ptr, size_t new_sz) {
 793         // Rust doesn't seem to use reallocarray currently
 794         assert(false);
 795 }
 796
 797 void __attribute__((destructor)) check_leaks() {
 798         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 799                 fprintf(stderr, "%s %p remains:\\n", a->struct_name, a->ptr);
 800                 backtrace_symbols_fd(a->bt, a->bt_len, STDERR_FILENO);
 801                 fprintf(stderr, "\\n\\n");
 802         }
 803         DO_ASSERT(allocation_ll == NULL);
 804 }
 805 """)
 806     out_java.write("""package org.ldk.impl;
 807 import org.ldk.enums.*;
 808
 809 public class bindings {
 810         public static class VecOrSliceDef {
 811                 public long dataptr;
 812                 public long datalen;
 813                 public long stride;
 814                 public VecOrSliceDef(long dataptr, long datalen, long stride) {
 815                         this.dataptr = dataptr; this.datalen = datalen; this.stride = stride;
 816                 }
 817         }
 818         static {
 819                 System.loadLibrary(\"lightningjni\");
 820                 init(java.lang.Enum.class, VecOrSliceDef.class);
 821         }
 822         static native void init(java.lang.Class c, java.lang.Class slicedef);
 823
 824         public static native boolean deref_bool(long ptr);
 825         public static native long deref_long(long ptr);
 826         public static native void free_heap_ptr(long ptr);
 827         public static native byte[] read_bytes(long ptr, long len);
 828         public static native byte[] get_u8_slice_bytes(long slice_ptr);
 829         public static native long bytes_to_u8_vec(byte[] bytes);
 830         public static native long new_txpointer_copy_data(byte[] txdata);
 831         public static native long vec_slice_len(long vec);
 832         public static native long new_empty_slice_vec();
 833
 834 """)
 835     out_c.write("""
 836 static jmethodID ordinal_meth = NULL;
 837 static jmethodID slicedef_meth = NULL;
 838 static jclass slicedef_cls = NULL;
 839 JNIEXPORT void Java_org_ldk_impl_bindings_init(JNIEnv * env, jclass _b, jclass enum_class, jclass slicedef_class) {
 840         ordinal_meth = (*env)->GetMethodID(env, enum_class, "ordinal", "()I");
 841         DO_ASSERT(ordinal_meth != NULL);
 842         slicedef_meth = (*env)->GetMethodID(env, slicedef_class, "<init>", "(JJJ)V");
 843         DO_ASSERT(slicedef_meth != NULL);
 844         slicedef_cls = (*env)->NewGlobalRef(env, slicedef_class);
 845         DO_ASSERT(slicedef_cls != NULL);
 846 }
 847
 848 JNIEXPORT jboolean JNICALL Java_org_ldk_impl_bindings_deref_1bool (JNIEnv * env, jclass _a, jlong ptr) {
 849         return *((bool*)ptr);
 850 }
 851 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_deref_1long (JNIEnv * env, jclass _a, jlong ptr) {
 852         return *((long*)ptr);
 853 }
 854 JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_free_1heap_1ptr (JNIEnv * env, jclass _a, jlong ptr) {
 855         FREE((void*)ptr);
 856 }
 857 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_read_1bytes (JNIEnv * _env, jclass _b, jlong ptr, jlong len) {
 858         jbyteArray ret_arr = (*_env)->NewByteArray(_env, len);
 859         (*_env)->SetByteArrayRegion(_env, ret_arr, 0, len, (unsigned char*)ptr);
 860         return ret_arr;
 861 }
 862 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_get_1u8_1slice_1bytes (JNIEnv * _env, jclass _b, jlong slice_ptr) {
 863         LDKu8slice *slice = (LDKu8slice*)slice_ptr;
 864         jbyteArray ret_arr = (*_env)->NewByteArray(_env, slice->datalen);
 865         (*_env)->SetByteArrayRegion(_env, ret_arr, 0, slice->datalen, slice->data);
 866         return ret_arr;
 867 }
 868 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_bytes_1to_1u8_1vec (JNIEnv * _env, jclass _b, jbyteArray bytes) {
 869         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "LDKCVec_u8");
 870         vec->datalen = (*_env)->GetArrayLength(_env, bytes);
 871         vec->data = (uint8_t*)MALLOC(vec->datalen, "LDKCVec_u8Z Bytes");
 872         (*_env)->GetByteArrayRegion (_env, bytes, 0, vec->datalen, vec->data);
 873         return (long)vec;
 874 }
 875 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_new_1txpointer_1copy_1data (JNIEnv * env, jclass _b, jbyteArray bytes) {
 876         LDKTransaction *txdata = (LDKTransaction*)MALLOC(sizeof(LDKTransaction), "LDKTransaction");
 877         txdata->datalen = (*env)->GetArrayLength(env, bytes);
 878         txdata->data = (uint8_t*)MALLOC(txdata->datalen, "Tx Data Bytes");
 879         txdata->data_is_owned = true;
 880         (*env)->GetByteArrayRegion (env, bytes, 0, txdata->datalen, txdata->data);
 881         return (long)txdata;
 882 }
 883 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_vec_1slice_1len (JNIEnv * env, jclass _a, jlong ptr) {
 884         // Check offsets of a few Vec types are all consistent as we're meant to be generic across types
 885         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_SignatureZ, datalen), "Vec<*> needs to be mapped identically");
 886         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_MessageSendEventZ, datalen), "Vec<*> needs to be mapped identically");
 887         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_EventZ, datalen), "Vec<*> needs to be mapped identically");
 888         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_C2Tuple_usizeTransactionZZ, datalen), "Vec<*> needs to be mapped identically");
 889         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)ptr;
 890         return (long)vec->datalen;
 891 }
 892 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_new_1empty_1slice_1vec (JNIEnv * _env, jclass _b) {
 893         // Check sizes of a few Vec types are all consistent as we're meant to be generic across types
 894         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_SignatureZ), "Vec<*> needs to be mapped identically");
 895         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_MessageSendEventZ), "Vec<*> needs to be mapped identically");
 896         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_EventZ), "Vec<*> needs to be mapped identically");
 897         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_C2Tuple_usizeTransactionZZ), "Vec<*> needs to be mapped identically");
 898         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "Empty LDKCVec");
 899         vec->data = NULL;
 900         vec->datalen = 0;
 901         return (long)vec;
 902 }
 903
 904 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
 905 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
 906 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
 907 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
 908
 909 """)
 910
 911     # XXX: Temporarily write out a manual SecretKey_new() for testing, we should auto-gen this kind of thing
 912     out_java.write("\tpublic static native long LDKSecretKey_new();\n\n") # TODO: rm me
 913     out_c.write("JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_LDKSecretKey_1new(JNIEnv * _env, jclass _b) {\n") # TODO: rm me
 914     out_c.write("\tLDKSecretKey* key = (LDKSecretKey*)MALLOC(sizeof(LDKSecretKey), \"LDKSecretKey\");\n") # TODO: rm me
 915     out_c.write("\treturn (long)key;\n") # TODO: rm me
 916     out_c.write("}\n") # TODO: rm me
 917
 918     in_block_comment = False
 919     cur_block_obj = None
 920
 921     fn_ptr_regex = re.compile("^extern const ([A-Za-z_0-9\* ]*) \(\*(.*)\)\((.*)\);$")
 922     fn_ret_arr_regex = re.compile("(.*) \(\*(.*)\((.*)\)\)\[([0-9]*)\];$")
 923     reg_fn_regex = re.compile("([A-Za-z_0-9\* ]* \*?)([a-zA-Z_0-9]*)\((.*)\);$")
 924     const_val_regex = re.compile("^extern const ([A-Za-z_0-9]*) ([A-Za-z_0-9]*);$")
 925
 926     line_indicates_result_regex = re.compile("^   (LDKCResultPtr_[A-Za-z_0-9]*) contents;$")
 927     line_indicates_vec_regex = re.compile("^   ([A-Za-z_0-9]*) \*data;$")
 928     line_indicates_opaque_regex = re.compile("^   bool is_owned;$")
 929     line_indicates_trait_regex = re.compile("^   ([A-Za-z_0-9]* \*?)\(\*([A-Za-z_0-9]*)\)\((const )?void \*this_arg(.*)\);$")
 930     assert(line_indicates_trait_regex.match("   uintptr_t (*send_data)(void *this_arg, LDKu8slice data, bool resume_read);"))
 931     assert(line_indicates_trait_regex.match("   LDKCVec_MessageSendEventZ (*get_and_clear_pending_msg_events)(const void *this_arg);"))
 932     assert(line_indicates_trait_regex.match("   void *(*clone)(const void *this_arg);"))
 933     line_field_var_regex = re.compile("^   ([A-Za-z_0-9]*) ([A-Za-z_0-9]*);$")
 934     assert(line_field_var_regex.match("   LDKMessageSendEventsProvider MessageSendEventsProvider;"))
 935     struct_name_regex = re.compile("^typedef (struct|enum|union) (MUST_USE_STRUCT )?(LDK[A-Za-z_0-9]*) {$")
 936     assert(struct_name_regex.match("typedef struct LDKCVecTempl_u8 {"))
 937     assert(struct_name_regex.match("typedef enum LDKNetwork {"))
 938     struct_alias_regex = re.compile("^typedef (LDK[A-Za-z_0-9]*) (LDK[A-Za-z_0-9]*);$")
 939     assert(struct_alias_regex.match("typedef LDKCResultTempl_bool__PeerHandleError LDKCResult_boolPeerHandleErrorZ;"))
 940
 941     result_templ_structs = set()
 942     union_enum_items = {}
 943     result_ptr_struct_items = {}
 944     for line in in_h:
 945         if in_block_comment:
 946             if line.endswith("*/\n"):
 947                 in_block_comment = False
 948         elif cur_block_obj is not None:
 949             cur_block_obj  = cur_block_obj + line
 950             if line.startswith("} "):
 951                 field_lines = []
 952                 struct_name = None
 953                 vec_ty = None
 954                 obj_lines = cur_block_obj.split("\n")
 955                 is_opaque = False
 956                 result_contents = None
 957                 is_unitary_enum = False
 958                 is_union_enum = False
 959                 is_union = False
 960                 is_tuple = False
 961                 trait_fn_lines = []
 962                 field_var_lines = []
 963
 964                 for idx, struct_line in enumerate(obj_lines):
 965                     if struct_line.strip().startswith("/*"):
 966                         in_block_comment = True
 967                     if in_block_comment:
 968                         if struct_line.endswith("*/"):
 969                             in_block_comment = False
 970                     else:
 971                         struct_name_match = struct_name_regex.match(struct_line)
 972                         if struct_name_match is not None:
 973                             struct_name = struct_name_match.group(3)
 974                             if struct_name_match.group(1) == "enum":
 975                                 if not struct_name.endswith("_Tag"):
 976                                     is_unitary_enum = True
 977                                 else:
 978                                     is_union_enum = True
 979                             elif struct_name_match.group(1) == "union":
 980                                 is_union = True
 981                         if line_indicates_opaque_regex.match(struct_line):
 982                             is_opaque = True
 983                         result_match = line_indicates_result_regex.match(struct_line)
 984                         if result_match is not None:
 985                             result_contents = result_match.group(1)
 986                         vec_ty_match = line_indicates_vec_regex.match(struct_line)
 987                         if vec_ty_match is not None and struct_name.startswith("LDKCVecTempl_"):
 988                             vec_ty = vec_ty_match.group(1)
 989                         elif struct_name.startswith("LDKC2TupleTempl_") or struct_name.startswith("LDKC3TupleTempl_"):
 990                             is_tuple = True
 991                         trait_fn_match = line_indicates_trait_regex.match(struct_line)
 992                         if trait_fn_match is not None:
 993                             trait_fn_lines.append(trait_fn_match)
 994                         field_var_match = line_field_var_regex.match(struct_line)
 995                         if field_var_match is not None:
 996                             field_var_lines.append(field_var_match)
 997                         field_lines.append(struct_line)
 998
 999                 assert(struct_name is not None)
1000                 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))
1001                 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))
1002                 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))
1003                 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))
1004                 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))
1005                 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))
1006                 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))
1007
1008                 if is_opaque:
1009                     opaque_structs.add(struct_name)
1010                 elif result_contents is not None:
1011                     result_templ_structs.add(struct_name)
1012                     assert result_contents in result_ptr_struct_items
1013                 elif struct_name.startswith("LDKCResultPtr_"):
1014                     for line in field_lines:
1015                         if line.endswith("*result;"):
1016                             res_ty = line[:-8].strip()
1017                         elif line.endswith("*err;"):
1018                             err_ty = line[:-5].strip()
1019                     result_ptr_struct_items[struct_name] = (res_ty, err_ty)
1020                 elif is_tuple:
1021                     out_java.write("\tpublic static native long " + struct_name + "_new(")
1022                     out_c.write("JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1new(JNIEnv *_env, jclass _b")
1023                     for idx, line in enumerate(field_lines):
1024                         if idx != 0 and idx < len(field_lines) - 2:
1025                             ty_info = java_c_types(line.strip(';'), None)
1026                             if idx != 1:
1027                                 out_java.write(", ")
1028                             e = chr(ord('a') + idx - 1)
1029                             out_java.write(ty_info.java_ty + " " + e)
1030                             out_c.write(", " + ty_info.c_ty + " " + e)
1031                     out_java.write(");\n")
1032                     out_c.write(") {\n")
1033                     out_c.write("\t" + struct_name + "* ret = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n")
1034                     for idx, line in enumerate(field_lines):
1035                         if idx != 0 and idx < len(field_lines) - 2:
1036                             ty_info = map_type(line.strip(';'), False, None, False)
1037                             e = chr(ord('a') + idx - 1)
1038                             if ty_info.arg_conv is not None:
1039                                 out_c.write("\t" + ty_info.arg_conv.replace("\n", "\n\t"))
1040                                 out_c.write("\n\tret->" + e + " = " + ty_info.arg_conv_name + ";\n")
1041                             else:
1042                                 out_c.write("\tret->" + e + " = " + e + ";\n")
1043                     out_c.write("\treturn (long)ret;\n")
1044                     out_c.write("}\n")
1045                 elif vec_ty is not None:
1046                     if vec_ty in opaque_structs:
1047                         out_java.write("\tpublic static native long[] " + struct_name + "_arr_info(long vec_ptr);\n")
1048                         out_c.write("JNIEXPORT jlongArray JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1arr_1info(JNIEnv *env, jclass _b, jlong ptr) {\n")
1049                     else:
1050                         out_java.write("\tpublic static native VecOrSliceDef " + struct_name + "_arr_info(long vec_ptr);\n")
1051                         out_c.write("JNIEXPORT jobject JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1arr_1info(JNIEnv *env, jclass _b, jlong ptr) {\n")
1052                     out_c.write("\t" + struct_name + " *vec = (" + struct_name + "*)ptr;\n")
1053                     if vec_ty in opaque_structs:
1054                         out_c.write("\tjlongArray ret = (*env)->NewLongArray(env, vec->datalen);\n")
1055                         out_c.write("\tjlong *ret_elems = (*env)->GetPrimitiveArrayCritical(env, ret, NULL);\n")
1056                         out_c.write("\tfor (size_t i = 0; i < vec->datalen; i++) {\n")
1057                         out_c.write("\t\tDO_ASSERT((((long)vec->data[i].inner) & 1) == 0);\n")
1058                         out_c.write("\t\tret_elems[i] = (long)vec->data[i].inner | (vec->data[i].is_owned ? 1 : 0);\n")
1059                         out_c.write("\t}\n")
1060                         out_c.write("\t(*env)->ReleasePrimitiveArrayCritical(env, ret, ret_elems, 0);\n")
1061                         out_c.write("\treturn ret;\n")
1062                     else:
1063                         out_c.write("\treturn (*env)->NewObject(env, slicedef_cls, slicedef_meth, (long)vec->data, (long)vec->datalen, sizeof(" + vec_ty + "));\n")
1064                     out_c.write("}\n")
1065
1066                     ty_info = map_type(vec_ty + " arr_elem", False, None, False)
1067                     if len(ty_info.java_fn_ty_arg) == 1: # ie we're a primitive of some form
1068                         out_java.write("\tpublic static native long " + struct_name + "_new(" + ty_info.java_ty + "[] elems);\n")
1069                         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")
1070                         out_c.write("\t" + struct_name + " *ret = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n")
1071                         out_c.write("\tret->datalen = (*env)->GetArrayLength(env, elems);\n")
1072                         out_c.write("\tif (ret->datalen == 0) {\n")
1073                         out_c.write("\t\tret->data = NULL;\n")
1074                         out_c.write("\t} else {\n")
1075                         out_c.write("\t\tret->data = MALLOC(sizeof(" + vec_ty + ") * ret->datalen, \"" + struct_name + " Data\");\n")
1076                         out_c.write("\t\t" + ty_info.c_ty + " *java_elems = (*env)->GetPrimitiveArrayCritical(env, elems, NULL);\n")
1077                         out_c.write("\t\tfor (size_t i = 0; i < ret->datalen; i++) {\n")
1078                         if ty_info.arg_conv is not None:
1079                             out_c.write("\t\t\t" + ty_info.c_ty + " arr_elem = java_elems[i];\n")
1080                             out_c.write("\t\t\t" + ty_info.arg_conv.replace("\n", "\n\t\t\t") + "\n")
1081                             out_c.write("\t\t\tret->data[i] = " + ty_info.arg_conv_name + ";\n")
1082                         else:
1083                             out_c.write("\t\t\tret->data[i] = java_elems[i];\n")
1084                         out_c.write("\t\t}\n")
1085                         out_c.write("\t\t(*env)->ReleasePrimitiveArrayCritical(env, elems, java_elems, 0);\n")
1086                         out_c.write("\t}\n")
1087                         out_c.write("\treturn (long)ret;\n")
1088                         out_c.write("}\n")
1089                 elif is_union_enum:
1090                     assert(struct_name.endswith("_Tag"))
1091                     struct_name = struct_name[:-4]
1092                     union_enum_items[struct_name] = {"field_lines": field_lines}
1093                 elif struct_name.endswith("_Body") and struct_name.split("_")[0] in union_enum_items:
1094                     enum_var_name = struct_name.split("_")
1095                     union_enum_items[enum_var_name[0]][enum_var_name[1]] = field_lines
1096                 elif struct_name in union_enum_items:
1097                     map_complex_enum(struct_name, union_enum_items[struct_name])
1098                 elif is_unitary_enum:
1099                     map_unitary_enum(struct_name, field_lines)
1100                 elif len(trait_fn_lines) > 0:
1101                     trait_structs.add(struct_name)
1102                     map_trait(struct_name, field_var_lines, trait_fn_lines)
1103                 cur_block_obj = None
1104         else:
1105             fn_ptr = fn_ptr_regex.match(line)
1106             fn_ret_arr = fn_ret_arr_regex.match(line)
1107             reg_fn = reg_fn_regex.match(line)
1108             const_val = const_val_regex.match(line)
1109
1110             if line.startswith("#include <"):
1111                 pass
1112             elif line.startswith("/*"):
1113                 #out_java.write("\t" + line)
1114                 if not line.endswith("*/\n"):
1115                     in_block_comment = True
1116             elif line.startswith("typedef enum "):
1117                 cur_block_obj = line
1118             elif line.startswith("typedef struct "):
1119                 cur_block_obj = line
1120             elif line.startswith("typedef union "):
1121                 cur_block_obj = line
1122             elif line.startswith("typedef "):
1123                 alias_match =  struct_alias_regex.match(line)
1124                 if alias_match.group(1) in result_templ_structs:
1125                     out_java.write("\tpublic static native boolean " + alias_match.group(2) + "_result_ok(long arg);\n")
1126                     out_java.write("\tpublic static native long " + alias_match.group(2) + "_get_inner(long arg);\n")
1127                     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")
1128                     out_c.write("\treturn ((" + alias_match.group(2) + "*)arg)->result_ok;\n")
1129                     out_c.write("}\n")
1130                     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")
1131                     contents_ty = alias_match.group(1).replace("LDKCResultTempl", "LDKCResultPtr")
1132                     res_ty, err_ty = result_ptr_struct_items[contents_ty]
1133                     out_c.write("\t" + alias_match.group(2) + " *val = (" + alias_match.group(2) + "*)arg;\n")
1134                     out_c.write("\tif (val->result_ok) {\n")
1135                     if res_ty not in opaque_structs:
1136                         out_c.write("\t\treturn (long)val->contents.result;\n")
1137                     else:
1138                         out_c.write("\t\treturn (long)(val->contents.result->inner) | (val->contents.result->is_owned ? 1 : 0);\n")
1139                     out_c.write("\t} else {\n")
1140                     if err_ty not in opaque_structs:
1141                         out_c.write("\t\treturn (long)val->contents.err;\n")
1142                     else:
1143                         out_c.write("\t\treturn (long)(val->contents.err->inner) | (val->contents.err->is_owned ? 1 : 0);\n")
1144                     out_c.write("\t}\n}\n")
1145                 pass
1146             elif fn_ptr is not None:
1147                 map_fn(line, fn_ptr, None, None)
1148             elif fn_ret_arr is not None:
1149                 map_fn(line, fn_ret_arr, fn_ret_arr.group(4), None)
1150             elif reg_fn is not None:
1151                 map_fn(line, reg_fn, None, None)
1152             elif const_val_regex is not None:
1153                 # TODO Map const variables
1154                 pass
1155             else:
1156                 assert(line == "\n")
1157
1158     out_java.write("}\n")