_ 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):
  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
  20 class ConvInfo:
  21     def __init__(self, ty_info, arg_name, arg_conv, arg_conv_name, ret_conv, ret_conv_name):
  22         assert(ty_info.c_ty is not None)
  23         assert(ty_info.java_ty is not None)
  24         assert(arg_name is not None)
  25         self.c_ty = ty_info.c_ty
  26         self.java_ty = ty_info.java_ty
  27         self.java_fn_ty_arg = ty_info.java_fn_ty_arg
  28         self.arg_name = arg_name
  29         self.arg_conv = arg_conv
  30         self.arg_conv_name = arg_conv_name
  31         self.ret_conv = ret_conv
  32         self.ret_conv_name = ret_conv_name
  33
  34     def print_ty(self):
  35         out_c.write(self.c_ty)
  36         out_java.write(self.java_ty)
  37
  38     def print_name(self):
  39         if self.arg_name != "":
  40             out_java.write(" " + self.arg_name)
  41             out_c.write(" " + self.arg_name)
  42         else:
  43             out_java.write(" arg")
  44             out_c.write(" arg")
  45
  46 with open(sys.argv[1]) as in_h, open(sys.argv[2], "w") as out_java, open(sys.argv[4], "w") as out_c:
  47     opaque_structs = set()
  48     trait_structs = set()
  49     unitary_enums = set()
  50
  51     def camel_to_snake(s):
  52         # Convert camel case to snake case, in a way that appears to match cbindgen
  53         con = "_"
  54         ret = ""
  55         lastchar = ""
  56         lastund = False
  57         for char in s:
  58             if lastchar.isupper():
  59                 if not char.isupper() and not lastund:
  60                     ret = ret + "_"
  61                     lastund = True
  62                 else:
  63                     lastund = False
  64                 ret = ret + lastchar.lower()
  65             else:
  66                 ret = ret + lastchar
  67                 if char.isupper() and not lastund:
  68                     ret = ret + "_"
  69                     lastund = True
  70                 else:
  71                     lastund = False
  72             lastchar = char
  73             if char.isnumeric():
  74                 lastund = True
  75         return (ret + lastchar.lower()).strip("_")
  76
  77     var_is_arr_regex = re.compile("\(\*([A-za-z0-9_]*)\)\[([0-9]*)\]")
  78     var_ty_regex = re.compile("([A-za-z_0-9]*)(.*)")
  79     def java_c_types(fn_arg, ret_arr_len):
  80         fn_arg = fn_arg.strip()
  81         if fn_arg.startswith("MUST_USE_RES "):
  82             fn_arg = fn_arg[13:]
  83         is_const = False
  84         if fn_arg.startswith("const "):
  85             fn_arg = fn_arg[6:]
  86             is_const = True
  87
  88         is_ptr = False
  89         take_by_ptr = False
  90         rust_obj = None
  91         if fn_arg.startswith("LDKThirtyTwoBytes"):
  92             fn_arg = "uint8_t (*" + fn_arg[18:] + ")[32]"
  93             assert var_is_arr_regex.match(fn_arg[8:])
  94             rust_obj = "LDKThirtyTwoBytes"
  95
  96         if fn_arg.startswith("void"):
  97             java_ty = "void"
  98             c_ty = "void"
  99             fn_ty_arg = "V"
 100             fn_arg = fn_arg[4:].strip()
 101         elif fn_arg.startswith("bool"):
 102             java_ty = "boolean"
 103             c_ty = "jboolean"
 104             fn_ty_arg = "Z"
 105             fn_arg = fn_arg[4:].strip()
 106         elif fn_arg.startswith("uint8_t"):
 107             java_ty = "byte"
 108             c_ty = "jbyte"
 109             fn_ty_arg = "B"
 110             fn_arg = fn_arg[7:].strip()
 111         elif fn_arg.startswith("uint16_t"):
 112             java_ty = "short"
 113             c_ty = "jshort"
 114             fn_ty_arg = "S"
 115             fn_arg = fn_arg[8:].strip()
 116         elif fn_arg.startswith("uint32_t"):
 117             java_ty = "int"
 118             c_ty = "jint"
 119             fn_ty_arg = "I"
 120             fn_arg = fn_arg[8:].strip()
 121         elif fn_arg.startswith("uint64_t") or fn_arg.startswith("uintptr_t"):
 122             java_ty = "long"
 123             c_ty = "jlong"
 124             fn_ty_arg = "J"
 125             if fn_arg.startswith("uint64_t"):
 126                 fn_arg = fn_arg[8:].strip()
 127             else:
 128                 fn_arg = fn_arg[9:].strip()
 129         elif is_const and fn_arg.startswith("char *"):
 130             java_ty = "String"
 131             c_ty = "const char*"
 132             fn_ty_arg = "Ljava/lang/String;"
 133             fn_arg = fn_arg[6:].strip()
 134         else:
 135             ma = var_ty_regex.match(fn_arg)
 136             if ma.group(1).strip() in unitary_enums:
 137                 java_ty = ma.group(1).strip()
 138                 c_ty = "jclass"
 139                 fn_ty_arg = "Lorg/ldk/enums/" + ma.group(1).strip() + ";"
 140                 fn_arg = ma.group(2).strip()
 141                 rust_obj = ma.group(1).strip()
 142                 take_by_ptr = True
 143             else:
 144                 java_ty = "long"
 145                 c_ty = "jlong"
 146                 fn_ty_arg = "J"
 147                 fn_arg = ma.group(2).strip()
 148                 rust_obj = ma.group(1).strip()
 149                 take_by_ptr = True
 150
 151         if fn_arg.startswith(" *") or fn_arg.startswith("*"):
 152             fn_arg = fn_arg.replace("*", "").strip()
 153             is_ptr = True
 154             c_ty = "jlong"
 155             java_ty = "long"
 156             fn_ty_arg = "J"
 157
 158         var_is_arr = var_is_arr_regex.match(fn_arg)
 159         if var_is_arr is not None or ret_arr_len is not None:
 160             assert(not take_by_ptr)
 161             assert(not is_ptr)
 162             java_ty = java_ty + "[]"
 163             c_ty = c_ty + "Array"
 164             if var_is_arr is not None:
 165                 return TypeInfo(rust_obj=rust_obj, java_ty=java_ty, java_fn_ty_arg="[" + fn_ty_arg, c_ty=c_ty,
 166                     passed_as_ptr=False, is_ptr=False, var_name=var_is_arr.group(1), arr_len=var_is_arr.group(2))
 167         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,
 168             is_ptr=is_ptr, var_name=fn_arg, arr_len=None)
 169
 170     def map_type(fn_arg, print_void, ret_arr_len, is_free):
 171         ty_info = java_c_types(fn_arg, ret_arr_len)
 172
 173         if ty_info.c_ty == "void":
 174             if not print_void:
 175                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 176                     arg_conv = None, arg_conv_name = None, ret_conv = None, ret_conv_name = None)
 177
 178         if ty_info.c_ty.endswith("Array"):
 179             arr_len = ty_info.arr_len
 180             if arr_len is not None:
 181                 arr_name = ty_info.var_name
 182             else:
 183                 arr_name = "ret"
 184                 arr_len = ret_arr_len
 185             assert(ty_info.c_ty == "jbyteArray")
 186             if ty_info.rust_obj is not None:
 187                 arg_conv = ty_info.rust_obj + " " + arr_name + "_ref;\n" + "(*_env)->GetByteArrayRegion (_env, """ + arr_name + ", 0, " + arr_len + ", " + arr_name + "_ref.data);"
 188                 arr_access = ("", ".data")
 189             else:
 190                 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;"
 191                 arr_access = ("*", "")
 192             return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 193                 arg_conv = arg_conv,
 194                 arg_conv_name = arr_name + "_ref",
 195                 ret_conv = ("jbyteArray " + arr_name + "_arr = (*_env)->NewByteArray(_env, " + arr_len + ");\n" +
 196                     "(*_env)->SetByteArrayRegion(_env, " + arr_name + "_arr, 0, " + arr_len + ", " + arr_access[0],
 197                     arr_access[1] + ");"),
 198                 ret_conv_name = arr_name + "_arr")
 199         elif ty_info.var_name != "":
 200             # If we have a parameter name, print it (noting that it may indicate its a pointer)
 201             if ty_info.rust_obj is not None:
 202                 assert(ty_info.passed_as_ptr)
 203                 if not ty_info.is_ptr:
 204                     if ty_info.rust_obj in unitary_enums:
 205                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 206                             arg_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv = " + ty_info.rust_obj + "_from_java(_env, " + ty_info.var_name + ");",
 207                             arg_conv_name = ty_info.var_name + "_conv",
 208                             ret_conv = ("jclass " + ty_info.var_name + "_conv = " + ty_info.rust_obj + "_to_java(_env, ", ");"),
 209                             ret_conv_name = ty_info.var_name + "_conv")
 210                     base_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv = *(" + ty_info.rust_obj + "*)" + ty_info.var_name + ";";
 211                     if ty_info.rust_obj in trait_structs:
 212                         if not is_free:
 213                             base_conv = base_conv + "\nif (" + ty_info.var_name + "_conv.free == " + ty_info.rust_obj + "_JCalls_free) {\n"
 214                             base_conv = base_conv + "\t// If this_arg is a JCalls struct, then we need to increment the refcnt in it.\n"
 215                             base_conv = base_conv + "\t" + ty_info.rust_obj + "_JCalls_clone(" + ty_info.var_name + "_conv.this_arg);\n}"
 216                         else:
 217                             base_conv = base_conv + "\n" + "FREE((void*)" + ty_info.var_name + ");"
 218                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 219                             arg_conv = base_conv,
 220                             arg_conv_name = ty_info.var_name + "_conv",
 221                             ret_conv = ("CANT PASS TRAIT TO Java?", ""), ret_conv_name = "NO CONV POSSIBLE")
 222                     if ty_info.rust_obj != "LDKu8slice":
 223                         # Don't bother free'ing slices passed in - we often pass them Rust -> Rust
 224                         base_conv = base_conv + "\nFREE((void*)" + ty_info.var_name + ");";
 225                     if ty_info.rust_obj in opaque_structs:
 226                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 227                             arg_conv = base_conv + "\n" + ty_info.var_name + "_conv.is_owned = true;",
 228                             arg_conv_name = ty_info.var_name + "_conv",
 229                             ret_conv = ("long " + ty_info.var_name + "_ref = (long)&", ";"), ret_conv_name = ty_info.var_name + "_ref")
 230
 231                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 232                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv",
 233                         ret_conv = ("long " + ty_info.var_name + "_ref = (long)&", ";"), ret_conv_name = ty_info.var_name + "_ref")
 234                 else:
 235                     assert(not is_free)
 236                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 237                         arg_conv = ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)" + ty_info.var_name + ";",
 238                         arg_conv_name = ty_info.var_name + "_conv",
 239                         ret_conv = None, ret_conv_name = None) # its a pointer, no conv needed
 240             elif ty_info.is_ptr:
 241                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 242                     arg_conv = None, arg_conv_name = ty_info.var_name, ret_conv = None, ret_conv_name = None)
 243             elif ty_info.java_ty == "String":
 244                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 245                     arg_conv = None, arg_conv_name = None,
 246                     ret_conv = ("jstring " + ty_info.var_name + "_conv = (*_env)->NewStringUTF(_env, ", ");"), ret_conv_name = ty_info.var_name + "_conv")
 247             else:
 248                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 249                     arg_conv = None, arg_conv_name = ty_info.var_name, ret_conv = None, ret_conv_name = None)
 250         elif not print_void:
 251             # We don't have a parameter name, and want one, just call it arg
 252             if ty_info.rust_obj is not None:
 253                 assert(not is_free or ty_info.rust_obj not in opaque_structs);
 254                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 255                     arg_conv = ty_info.rust_obj + " arg_conv = *(" + ty_info.rust_obj + "*)arg;\nFREE((void*)arg);",
 256                     arg_conv_name = "arg_conv",
 257                     ret_conv = None, ret_conv_name = None)
 258             else:
 259                 assert(not is_free)
 260                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 261                     arg_conv = None, arg_conv_name = "arg", ret_conv = None, ret_conv_name = None)
 262         else:
 263             # We don't have a parameter name, and don't want one (cause we're returning)
 264             if ty_info.rust_obj is not None:
 265                 if not ty_info.is_ptr:
 266                     if ty_info.rust_obj in unitary_enums:
 267                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 268                             arg_conv = ty_info.rust_obj + " ret = " + ty_info.rust_obj + "_from_java(_env, " + ty_info.var_name + ");",
 269                             arg_conv_name = "ret",
 270                             ret_conv = ("jclass ret = " + ty_info.rust_obj + "_to_java(_env, ", ");"), ret_conv_name = "ret")
 271                     if ty_info.rust_obj in opaque_structs:
 272                         # If we're returning a newly-allocated struct, we don't want Rust to ever
 273                         # free, instead relying on the Java GC to lose the ref. We undo this in
 274                         # any _free function.
 275                         # To avoid any issues, we first assert that the incoming object is non-ref.
 276                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 277                             ret_conv = (ty_info.rust_obj + "* ret = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n*ret = ", ";\nDO_ASSERT(ret->is_owned);\nret->is_owned = false;"),
 278                             ret_conv_name = "(long)ret",
 279                             arg_conv = None, arg_conv_name = None)
 280                     else:
 281                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 282                             ret_conv = (ty_info.rust_obj + "* ret = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n*ret = ", ";"),
 283                             ret_conv_name = "(long)ret",
 284                             arg_conv = None, arg_conv_name = None)
 285                 else:
 286                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 287                         ret_conv = ("long ret = (long)", ";"), ret_conv_name = "ret",
 288                         arg_conv = None, arg_conv_name = None)
 289             else:
 290                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 291                     arg_conv = None, arg_conv_name = None, ret_conv = None, ret_conv_name = None)
 292
 293     def map_fn(line, re_match, ret_arr_len, c_call_string):
 294         out_java.write("\t// " + line)
 295         out_java.write("\tpublic static native ")
 296         out_c.write("JNIEXPORT ")
 297
 298         ret_info = map_type(re_match.group(1), True, ret_arr_len, False)
 299         ret_info.print_ty()
 300         if ret_info.ret_conv is not None:
 301             ret_conv_pfx, ret_conv_sfx = ret_info.ret_conv
 302
 303         out_java.write(" " + re_match.group(2) + "(")
 304         out_c.write(" JNICALL Java_org_ldk_impl_bindings_" + re_match.group(2).replace('_', '_1') + "(JNIEnv * _env, jclass _b")
 305
 306         arg_names = []
 307         for idx, arg in enumerate(re_match.group(3).split(',')):
 308             if idx != 0:
 309                 out_java.write(", ")
 310             if arg != "void":
 311                 out_c.write(", ")
 312             arg_conv_info = map_type(arg, False, None, re_match.group(2).endswith("_free"))
 313             if arg_conv_info.c_ty != "void":
 314                 arg_conv_info.print_ty()
 315                 arg_conv_info.print_name()
 316             arg_names.append(arg_conv_info)
 317
 318         out_java.write(");\n")
 319         out_c.write(") {\n")
 320
 321         for info in arg_names:
 322             if info.arg_conv is not None:
 323                 out_c.write("\t" + info.arg_conv.replace('\n', "\n\t") + "\n");
 324
 325         if ret_info.ret_conv is not None:
 326             out_c.write("\t" + ret_conv_pfx.replace('\n', '\n\t'));
 327         else:
 328             out_c.write("\treturn ");
 329
 330         if c_call_string is None:
 331             out_c.write(re_match.group(2) + "(")
 332         else:
 333             out_c.write(c_call_string)
 334         for idx, info in enumerate(arg_names):
 335             if info.arg_conv_name is not None:
 336                 if idx != 0:
 337                     out_c.write(", ")
 338                 elif c_call_string is not None:
 339                     continue
 340                 out_c.write(info.arg_conv_name)
 341         out_c.write(")")
 342         if ret_info.ret_conv is not None:
 343             out_c.write(ret_conv_sfx.replace('\n', '\n\t'))
 344             out_c.write("\n\treturn " + ret_info.ret_conv_name + ";")
 345         else:
 346             out_c.write(";")
 347         out_c.write("\n}\n\n")
 348
 349     def map_trait(struct_name, field_var_lines, trait_fn_lines):
 350         out_c.write("typedef struct " + struct_name + "_JCalls {\n")
 351         out_c.write("\tatomic_size_t refcnt;\n")
 352         out_c.write("\tJavaVM *vm;\n")
 353         out_c.write("\tjobject o;\n")
 354         for var_line in field_var_lines:
 355             if var_line.group(1) in trait_structs:
 356                 out_c.write("\t" + var_line.group(1) + "_JCalls* " + var_line.group(2) + ";\n")
 357         for fn_line in trait_fn_lines:
 358             if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
 359                 out_c.write("\tjmethodID " + fn_line.group(2) + "_meth;\n")
 360         out_c.write("} " + struct_name + "_JCalls;\n")
 361
 362         out_java.write("\tpublic interface " + struct_name + " {\n")
 363         java_meths = []
 364         for fn_line in trait_fn_lines:
 365             java_meth_descr = "("
 366             if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
 367                 ret_ty_info = java_c_types(fn_line.group(1), None)
 368
 369                 out_java.write("\t\t " + ret_ty_info.java_ty + " " + fn_line.group(2) + "(")
 370                 is_const = fn_line.group(3) is not None
 371                 out_c.write(fn_line.group(1) + fn_line.group(2) + "_jcall(")
 372                 if is_const:
 373                     out_c.write("const void* this_arg")
 374                 else:
 375                     out_c.write("void* this_arg")
 376
 377                 arg_names = []
 378                 for idx, arg in enumerate(fn_line.group(4).split(',')):
 379                     if arg == "":
 380                         continue
 381                     if idx >= 2:
 382                         out_java.write(", ")
 383                     out_c.write(", ")
 384                     arg_conv_info = map_type(arg, True, None, False)
 385                     out_c.write(arg.strip())
 386                     out_java.write(arg_conv_info.java_ty + " " + arg_conv_info.arg_name)
 387                     arg_names.append(arg_conv_info)
 388                     java_meth_descr = java_meth_descr + arg_conv_info.java_fn_ty_arg
 389                 java_meth_descr = java_meth_descr + ")" + ret_ty_info.java_fn_ty_arg
 390                 java_meths.append(java_meth_descr)
 391
 392                 out_java.write(");\n")
 393                 out_c.write(") {\n")
 394                 out_c.write("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
 395                 out_c.write("\tJNIEnv *env;\n")
 396                 out_c.write("\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_8) == JNI_OK);\n")
 397
 398                 for arg_info in arg_names:
 399                     if arg_info.ret_conv is not None:
 400                         out_c.write("\t" + arg_info.ret_conv[0].replace('\n', '\n\t').replace("_env", "env"));
 401                         out_c.write(arg_info.arg_name)
 402                         out_c.write(arg_info.ret_conv[1].replace('\n', '\n\t').replace("_env", "env") + "\n")
 403
 404                 if ret_ty_info.c_ty.endswith("Array"):
 405                     assert(ret_ty_info.c_ty == "jbyteArray")
 406                     out_c.write("\tjbyteArray jret = (*env)->CallObjectMethod(env, j_calls->o, j_calls->" + fn_line.group(2) + "_meth")
 407                 elif not ret_ty_info.passed_as_ptr:
 408                     out_c.write("\treturn (*env)->Call" + ret_ty_info.java_ty.title() + "Method(env, j_calls->o, j_calls->" + fn_line.group(2) + "_meth")
 409                 else:
 410                     out_c.write("\t" + fn_line.group(1).strip() + "* ret = (" + fn_line.group(1).strip() + "*)(*env)->CallLongMethod(env, j_calls->o, j_calls->" + fn_line.group(2) + "_meth");
 411
 412                 for arg_info in arg_names:
 413                     if arg_info.ret_conv is not None:
 414                         out_c.write(", " + arg_info.ret_conv_name)
 415                     else:
 416                         out_c.write(", " + arg_info.arg_name)
 417                 out_c.write(");\n");
 418                 if ret_ty_info.c_ty.endswith("Array"):
 419                     out_c.write("\tLDKThirtyTwoBytes ret;\n")
 420                     out_c.write("\t(*env)->GetByteArrayRegion(env, jret, 0, " + ret_ty_info.arr_len + ", ret.data);\n")
 421                     out_c.write("\treturn ret;\n")
 422
 423                 if ret_ty_info.passed_as_ptr:
 424                     out_c.write("\t" + fn_line.group(1).strip() + " res = *ret;\n")
 425                     out_c.write("\tFREE(ret);\n")
 426                     out_c.write("\treturn res;\n")
 427                 out_c.write("}\n")
 428             elif fn_line.group(2) == "free":
 429                 out_c.write("static void " + struct_name + "_JCalls_free(void* this_arg) {\n")
 430                 out_c.write("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
 431                 out_c.write("\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n")
 432                 out_c.write("\t\tJNIEnv *env;\n")
 433                 out_c.write("\t\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_8) == JNI_OK);\n")
 434                 out_c.write("\t\t(*env)->DeleteGlobalRef(env, j_calls->o);\n")
 435                 out_c.write("\t\tFREE(j_calls);\n")
 436                 out_c.write("\t}\n}\n")
 437
 438         # Write out a clone function whether we need one or not, as we use them in moving to rust
 439         out_c.write("static void* " + struct_name + "_JCalls_clone(const void* this_arg) {\n")
 440         out_c.write("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
 441         out_c.write("\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n")
 442         for var_line in field_var_lines:
 443             if var_line.group(1) in trait_structs:
 444                 out_c.write("\tatomic_fetch_add_explicit(&j_calls->" + var_line.group(2) + "->refcnt, 1, memory_order_release);\n")
 445         out_c.write("\treturn (void*) this_arg;\n")
 446         out_c.write("}\n")
 447
 448         out_java.write("\t}\n")
 449
 450         out_java.write("\tpublic static native long " + struct_name + "_new(" + struct_name + " impl")
 451         out_c.write("static inline " + struct_name + " " + struct_name + "_init (JNIEnv * env, jclass _a, jobject o")
 452         for var_line in field_var_lines:
 453             if var_line.group(1) in trait_structs:
 454                 out_java.write(", " + var_line.group(1) + " " + var_line.group(2))
 455                 out_c.write(", jobject " + var_line.group(2))
 456         out_java.write(");\n")
 457         out_c.write(") {\n")
 458
 459         out_c.write("\tjclass c = (*env)->GetObjectClass(env, o);\n")
 460         out_c.write("\tDO_ASSERT(c != NULL);\n")
 461         out_c.write("\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n")
 462         out_c.write("\tatomic_init(&calls->refcnt, 1);\n")
 463         out_c.write("\tDO_ASSERT((*env)->GetJavaVM(env, &calls->vm) == 0);\n")
 464         out_c.write("\tcalls->o = (*env)->NewGlobalRef(env, o);\n")
 465         for (fn_line, java_meth_descr) in zip(trait_fn_lines, java_meths):
 466             if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
 467                 out_c.write("\tcalls->" + fn_line.group(2) + "_meth = (*env)->GetMethodID(env, c, \"" + fn_line.group(2) + "\", \"" + java_meth_descr + "\");\n")
 468                 out_c.write("\tDO_ASSERT(calls->" + fn_line.group(2) + "_meth != NULL);\n")
 469         out_c.write("\n\t" + struct_name + " ret = {\n")
 470         out_c.write("\t\t.this_arg = (void*) calls,\n")
 471         for fn_line in trait_fn_lines:
 472             if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
 473                 out_c.write("\t\t." + fn_line.group(2) + " = " + fn_line.group(2) + "_jcall,\n")
 474             elif fn_line.group(2) == "free":
 475                 out_c.write("\t\t.free = " + struct_name + "_JCalls_free,\n")
 476             else:
 477                 out_c.write("\t\t.clone = " + struct_name + "_JCalls_clone,\n")
 478         for var_line in field_var_lines:
 479             if var_line.group(1) in trait_structs:
 480                 out_c.write("\t\t." + var_line.group(2) + " = " + var_line.group(1) + "_init(env, _a, " + var_line.group(2) + "),\n")
 481         out_c.write("\t};\n")
 482         for var_line in field_var_lines:
 483             if var_line.group(1) in trait_structs:
 484                 out_c.write("\tcalls->" + var_line.group(2) + " = ret." + var_line.group(2) + ".this_arg;\n")
 485         out_c.write("\treturn ret;\n")
 486         out_c.write("}\n")
 487
 488         out_c.write("JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1new (JNIEnv * env, jclass _a, jobject o")
 489         for var_line in field_var_lines:
 490             if var_line.group(1) in trait_structs:
 491                 out_c.write(", jobject " + var_line.group(2))
 492         out_c.write(") {\n")
 493         out_c.write("\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n")
 494         out_c.write("\t*res_ptr = " + struct_name + "_init(env, _a, o")
 495         for var_line in field_var_lines:
 496             if var_line.group(1) in trait_structs:
 497                 out_c.write(", " + var_line.group(2))
 498         out_c.write(");\n")
 499         out_c.write("\treturn (long)res_ptr;\n")
 500         out_c.write("}\n")
 501
 502         out_java.write("\tpublic static native " + struct_name + " " + struct_name + "_get_obj_from_jcalls(long val);\n")
 503         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")
 504         out_c.write("\treturn ((" + struct_name + "_JCalls*)val)->o;\n")
 505         out_c.write("}\n")
 506
 507         for fn_line in trait_fn_lines:
 508             # For now, just disable enabling the _call_log - we don't know how to inverse-map String
 509             is_log = fn_line.group(2) == "log" and struct_name == "LDKLogger"
 510             if fn_line.group(2) != "free" and fn_line.group(2) != "clone" and fn_line.group(2) != "eq" and not is_log:
 511                 dummy_line = fn_line.group(1) + struct_name + "_call_" + fn_line.group(2) + " " + struct_name + "* arg" + fn_line.group(4) + "\n"
 512                 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")
 513
 514     out_c.write("""#include \"org_ldk_impl_bindings.h\"
 515 #include <rust_types.h>
 516 #include <lightning.h>
 517 #include <string.h>
 518 #include <stdatomic.h>
 519 """)
 520
 521     if sys.argv[4] == "false":
 522         out_c.write("#define MALLOC(a, _) malloc(a)\n")
 523         out_c.write("#define FREE free\n")
 524         out_c.write("#define DO_ASSERT(a) (void)(a)\n")
 525     else:
 526         out_c.write("""#include <assert.h>
 527 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
 528
 529 #include <threads.h>
 530 static mtx_t allocation_mtx;
 531
 532 void __attribute__((constructor)) init_mtx() {
 533         DO_ASSERT(mtx_init(&allocation_mtx, mtx_plain) == thrd_success);
 534 }
 535
 536 typedef struct allocation {
 537         struct allocation* next;
 538         void* ptr;
 539         const char* struct_name;
 540 } allocation;
 541 static allocation* allocation_ll = NULL;
 542
 543 static void* MALLOC(size_t len, const char* struct_name) {
 544         void* res = malloc(len);
 545         allocation* new_alloc = malloc(sizeof(allocation));
 546         new_alloc->ptr = res;
 547         new_alloc->struct_name = struct_name;
 548         DO_ASSERT(mtx_lock(&allocation_mtx) == thrd_success);
 549         new_alloc->next = allocation_ll;
 550         allocation_ll = new_alloc;
 551         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
 552         return res;
 553 }
 554
 555 static void FREE(void* ptr) {
 556         allocation* p = NULL;
 557         DO_ASSERT(mtx_lock(&allocation_mtx) == thrd_success);
 558         allocation* it = allocation_ll;
 559         while (it->ptr != ptr) { p = it; it = it->next; }
 560         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
 561         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
 562         DO_ASSERT(it->ptr == ptr);
 563         free(it);
 564         free(ptr);
 565 }
 566
 567 void __attribute__((destructor)) check_leaks() {
 568         for (allocation* a = allocation_ll; a != NULL; a = a->next) { fprintf(stderr, "%s %p remains\\n", a->struct_name, a->ptr); }
 569         DO_ASSERT(allocation_ll == NULL);
 570 }
 571 """)
 572     out_java.write("""package org.ldk.impl;
 573 import org.ldk.enums.*;
 574
 575 public class bindings {
 576         public static class VecOrSliceDef {
 577                 public long dataptr;
 578                 public long datalen;
 579                 public long stride;
 580                 public VecOrSliceDef(long dataptr, long datalen, long stride) {
 581                         this.dataptr = dataptr; this.datalen = datalen; this.stride = stride;
 582                 }
 583         }
 584         static {
 585                 System.loadLibrary(\"lightningjni\");
 586                 init(java.lang.Enum.class, VecOrSliceDef.class);
 587         }
 588         static native void init(java.lang.Class c, java.lang.Class slicedef);
 589
 590         public static native boolean deref_bool(long ptr);
 591         public static native long deref_long(long ptr);
 592         public static native void free_heap_ptr(long ptr);
 593         public static native byte[] read_bytes(long ptr, long len);
 594         public static native byte[] get_u8_slice_bytes(long slice_ptr);
 595         public static native long bytes_to_u8_vec(byte[] bytes);
 596         public static native long vec_slice_len(long vec);
 597         public static native long new_empty_slice_vec();
 598
 599 """)
 600     out_c.write("""
 601 static jmethodID ordinal_meth = NULL;
 602 static jmethodID slicedef_meth = NULL;
 603 static jclass slicedef_cls = NULL;
 604 JNIEXPORT void Java_org_ldk_impl_bindings_init(JNIEnv * env, jclass _b, jclass enum_class, jclass slicedef_class) {
 605         ordinal_meth = (*env)->GetMethodID(env, enum_class, "ordinal", "()I");
 606         DO_ASSERT(ordinal_meth != NULL);
 607         slicedef_meth = (*env)->GetMethodID(env, slicedef_class, "<init>", "(JJJ)V");
 608         DO_ASSERT(slicedef_meth != NULL);
 609         slicedef_cls = (*env)->NewGlobalRef(env, slicedef_class);
 610         DO_ASSERT(slicedef_cls != NULL);
 611 }
 612
 613 JNIEXPORT jboolean JNICALL Java_org_ldk_impl_bindings_deref_1bool (JNIEnv * env, jclass _a, jlong ptr) {
 614         return *((bool*)ptr);
 615 }
 616 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_deref_1long (JNIEnv * env, jclass _a, jlong ptr) {
 617         return *((long*)ptr);
 618 }
 619 JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_free_1heap_1ptr (JNIEnv * env, jclass _a, jlong ptr) {
 620         FREE((void*)ptr);
 621 }
 622 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_read_1bytes (JNIEnv * _env, jclass _b, jlong ptr, jlong len) {
 623         jbyteArray ret_arr = (*_env)->NewByteArray(_env, len);
 624         (*_env)->SetByteArrayRegion(_env, ret_arr, 0, len, (unsigned char*)ptr);
 625         return ret_arr;
 626 }
 627 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_get_1u8_1slice_1bytes (JNIEnv * _env, jclass _b, jlong slice_ptr) {
 628         LDKu8slice *slice = (LDKu8slice*)slice_ptr;
 629         jbyteArray ret_arr = (*_env)->NewByteArray(_env, slice->datalen);
 630         (*_env)->SetByteArrayRegion(_env, ret_arr, 0, slice->datalen, slice->data);
 631         return ret_arr;
 632 }
 633 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_bytes_1to_1u8_1vec (JNIEnv * _env, jclass _b, jbyteArray bytes) {
 634         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "LDKCVec_u8");
 635         vec->datalen = (*_env)->GetArrayLength(_env, bytes);
 636         vec->data = (uint8_t*)malloc(vec->datalen); // May be freed by rust, so don't track allocation
 637         (*_env)->GetByteArrayRegion (_env, bytes, 0, vec->datalen, vec->data);
 638         return (long)vec;
 639 }
 640 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_vec_1slice_1len (JNIEnv * env, jclass _a, jlong ptr) {
 641         // Check offsets of a few Vec types are all consistent as we're meant to be generic across types
 642         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_SignatureZ, datalen), "Vec<*> needs to be mapped identically");
 643         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_MessageSendEventZ, datalen), "Vec<*> needs to be mapped identically");
 644         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_EventZ, datalen), "Vec<*> needs to be mapped identically");
 645         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_C2Tuple_usizeTransactionZZ, datalen), "Vec<*> needs to be mapped identically");
 646         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)ptr;
 647         return (long)vec->datalen;
 648 }
 649 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_new_1empty_1slice_1vec (JNIEnv * _env, jclass _b) {
 650         // Check sizes of a few Vec types are all consistent as we're meant to be generic across types
 651         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_SignatureZ), "Vec<*> needs to be mapped identically");
 652         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_MessageSendEventZ), "Vec<*> needs to be mapped identically");
 653         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_EventZ), "Vec<*> needs to be mapped identically");
 654         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_C2Tuple_usizeTransactionZZ), "Vec<*> needs to be mapped identically");
 655         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "Empty LDKCVec");
 656         vec->data = NULL;
 657         vec->datalen = 0;
 658         return (long)vec;
 659 }
 660
 661 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
 662 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
 663 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
 664 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
 665
 666 """)
 667
 668     # XXX: Temporarily write out a manual SecretKey_new() for testing, we should auto-gen this kind of thing
 669     out_java.write("\tpublic static native long LDKSecretKey_new();\n\n") # TODO: rm me
 670     out_c.write("JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_LDKSecretKey_1new(JNIEnv * _env, jclass _b) {\n") # TODO: rm me
 671     out_c.write("\tLDKSecretKey* key = (LDKSecretKey*)MALLOC(sizeof(LDKSecretKey), \"LDKSecretKey\");\n") # TODO: rm me
 672     out_c.write("\treturn (long)key;\n") # TODO: rm me
 673     out_c.write("}\n") # TODO: rm me
 674
 675     in_block_comment = False
 676     cur_block_obj = None
 677
 678     fn_ptr_regex = re.compile("^extern const ([A-Za-z_0-9\* ]*) \(\*(.*)\)\((.*)\);$")
 679     fn_ret_arr_regex = re.compile("(.*) \(\*(.*)\((.*)\)\)\[([0-9]*)\];$")
 680     reg_fn_regex = re.compile("([A-Za-z_0-9\* ]* \*?)([a-zA-Z_0-9]*)\((.*)\);$")
 681     const_val_regex = re.compile("^extern const ([A-Za-z_0-9]*) ([A-Za-z_0-9]*);$")
 682
 683     line_indicates_result_regex = re.compile("^   bool result_ok;$")
 684     line_indicates_vec_regex = re.compile("^   ([A-Za-z_0-9]*) \*data;$")
 685     line_indicates_opaque_regex = re.compile("^   bool is_owned;$")
 686     line_indicates_trait_regex = re.compile("^   ([A-Za-z_0-9]* \*?)\(\*([A-Za-z_0-9]*)\)\((const )?void \*this_arg(.*)\);$")
 687     assert(line_indicates_trait_regex.match("   uintptr_t (*send_data)(void *this_arg, LDKu8slice data, bool resume_read);"))
 688     assert(line_indicates_trait_regex.match("   LDKCVec_MessageSendEventZ (*get_and_clear_pending_msg_events)(const void *this_arg);"))
 689     assert(line_indicates_trait_regex.match("   void *(*clone)(const void *this_arg);"))
 690     line_field_var_regex = re.compile("^   ([A-Za-z_0-9]*) ([A-Za-z_0-9]*);$")
 691     assert(line_field_var_regex.match("   LDKMessageSendEventsProvider MessageSendEventsProvider;"))
 692     struct_name_regex = re.compile("^typedef (struct|enum|union) (MUST_USE_STRUCT )?(LDK[A-Za-z_0-9]*) {$")
 693     assert(struct_name_regex.match("typedef struct LDKCVecTempl_u8 {"))
 694     assert(struct_name_regex.match("typedef enum LDKNetwork {"))
 695     struct_alias_regex = re.compile("^typedef (LDK[A-Za-z_0-9]*) (LDK[A-Za-z_0-9]*);$")
 696     assert(struct_alias_regex.match("typedef LDKCResultTempl_bool__PeerHandleError LDKCResult_boolPeerHandleErrorZ;"))
 697
 698     result_templ_structs = set()
 699     union_enum_items = {}
 700     for line in in_h:
 701         if in_block_comment:
 702             #out_java.write("\t" + line)
 703             if line.endswith("*/\n"):
 704                 in_block_comment = False
 705         elif cur_block_obj is not None:
 706             cur_block_obj  = cur_block_obj + line
 707             if line.startswith("} "):
 708                 field_lines = []
 709                 struct_name = None
 710                 vec_ty = None
 711                 obj_lines = cur_block_obj.split("\n")
 712                 is_opaque = False
 713                 is_result = False
 714                 is_unitary_enum = False
 715                 is_union_enum = False
 716                 is_union = False
 717                 trait_fn_lines = []
 718                 field_var_lines = []
 719
 720                 for idx, struct_line in enumerate(obj_lines):
 721                     if struct_line.strip().startswith("/*"):
 722                         in_block_comment = True
 723                     if in_block_comment:
 724                         if struct_line.endswith("*/"):
 725                             in_block_comment = False
 726                     else:
 727                         struct_name_match = struct_name_regex.match(struct_line)
 728                         vec_ty_match = line_indicates_vec_regex.match(struct_line)
 729                         if struct_name_match is not None:
 730                             struct_name = struct_name_match.group(3)
 731                             if struct_name_match.group(1) == "enum":
 732                                 if not struct_name.endswith("_Tag"):
 733                                     is_unitary_enum = True
 734                                 else:
 735                                     is_union_enum = True
 736                             elif struct_name_match.group(1) == "union":
 737                                 is_union = True
 738                         if line_indicates_opaque_regex.match(struct_line):
 739                             is_opaque = True
 740                         elif line_indicates_result_regex.match(struct_line):
 741                             is_result = True
 742                         elif vec_ty_match is not None and struct_name.startswith("LDKCVecTempl_"):
 743                             vec_ty = vec_ty_match.group(1)
 744                         trait_fn_match = line_indicates_trait_regex.match(struct_line)
 745                         if trait_fn_match is not None:
 746                             trait_fn_lines.append(trait_fn_match)
 747                         field_var_match = line_field_var_regex.match(struct_line)
 748                         if field_var_match is not None:
 749                             field_var_lines.append(field_var_match)
 750                         field_lines.append(struct_line)
 751
 752                 assert(struct_name is not None)
 753                 assert(len(trait_fn_lines) == 0 or not (is_opaque or is_unitary_enum or is_union_enum or is_union or is_result or vec_ty is not None))
 754                 assert(not is_opaque or not (len(trait_fn_lines) != 0 or is_unitary_enum or is_union_enum or is_union or is_result or vec_ty is not None))
 755                 assert(not is_unitary_enum or not (len(trait_fn_lines) != 0 or is_opaque or is_union_enum or is_union or is_result or vec_ty is not None))
 756                 assert(not is_union_enum or not (len(trait_fn_lines) != 0 or is_unitary_enum or is_opaque or is_union or is_result or vec_ty is not None))
 757                 assert(not is_union or not (len(trait_fn_lines) != 0 or is_unitary_enum or is_union_enum or is_opaque or is_result or vec_ty is not None))
 758                 assert(not is_result 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))
 759                 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 is_result))
 760
 761                 if is_opaque:
 762                     opaque_structs.add(struct_name)
 763                     out_java.write("\tpublic static native long " + struct_name + "_optional_none();\n")
 764                     out_c.write("JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1optional_1none (JNIEnv * env, jclass _a) {\n")
 765                     out_c.write("\t" + struct_name + " *ret = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n")
 766                     out_c.write("\tret->inner = NULL;\n")
 767                     out_c.write("\treturn (long)ret;\n")
 768                     out_c.write("}\n")
 769                 elif is_result:
 770                     result_templ_structs.add(struct_name)
 771                 elif vec_ty is not None:
 772                     out_java.write("\tpublic static native VecOrSliceDef " + struct_name + "_arr_info(long vec_ptr);\n")
 773                     out_c.write("JNIEXPORT jobject JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1arr_1info(JNIEnv *env, jclass _b, jlong ptr) {\n")
 774                     out_c.write("\t" + struct_name + " *vec = (" + struct_name + "*)ptr;\n")
 775                     out_c.write("\treturn (*env)->NewObject(env, slicedef_cls, slicedef_meth, (long)vec->data, (long)vec->datalen, sizeof(" + vec_ty + "));\n")
 776                     out_c.write("}\n")
 777                 elif is_union_enum:
 778                     assert(struct_name.endswith("_Tag"))
 779                     struct_name = struct_name[:-4]
 780                     union_enum_items[struct_name] = {"field_lines": field_lines}
 781                 elif struct_name.endswith("_Body") and struct_name.split("_")[0] in union_enum_items:
 782                     enum_var_name = struct_name.split("_")
 783                     union_enum_items[enum_var_name[0]][enum_var_name[1]] = field_lines
 784                 elif struct_name in union_enum_items:
 785                     tag_field_lines = union_enum_items[struct_name]["field_lines"]
 786                     init_meth_jty_strs = {}
 787                     for idx, struct_line in enumerate(tag_field_lines):
 788                         if idx == 0:
 789                             out_java.write("\tpublic static class " + struct_name + " {\n")
 790                             out_java.write("\t\tprivate " + struct_name + "() {}\n")
 791                         elif idx == len(tag_field_lines) - 3:
 792                             assert(struct_line.endswith("_Sentinel,"))
 793                         elif idx == len(tag_field_lines) - 2:
 794                             out_java.write("\t\tstatic native void init();\n")
 795                             out_java.write("\t}\n")
 796                         elif idx == len(tag_field_lines) - 1:
 797                             assert(struct_line == "")
 798                         else:
 799                             var_name = struct_line.strip(' ,')[len(struct_name) + 1:]
 800                             out_java.write("\t\tpublic final static class " + var_name + " extends " + struct_name + " {\n")
 801                             out_c.write("static jclass " + struct_name + "_" + var_name + "_class = NULL;\n")
 802                             out_c.write("static jmethodID " + struct_name + "_" + var_name + "_meth = NULL;\n")
 803                             init_meth_jty_str = ""
 804                             init_meth_params = ""
 805                             init_meth_body = ""
 806                             if "LDK" + var_name in union_enum_items[struct_name]:
 807                                 enum_var_lines = union_enum_items[struct_name]["LDK" + var_name]
 808                                 for idx, field in enumerate(enum_var_lines):
 809                                     if idx != 0 and idx < len(enum_var_lines) - 2:
 810                                         field_ty = java_c_types(field.strip(' ;'), None)
 811                                         out_java.write("\t\t\tpublic " + field_ty.java_ty + " " + field_ty.var_name + ";\n")
 812                                         init_meth_jty_str = init_meth_jty_str + field_ty.java_fn_ty_arg
 813                                         if idx > 1:
 814                                             init_meth_params = init_meth_params + ", "
 815                                         init_meth_params = init_meth_params + field_ty.java_ty + " " + field_ty.var_name
 816                                         init_meth_body = init_meth_body + "this." + field_ty.var_name + " = " + field_ty.var_name + "; "
 817                                 out_java.write("\t\t\t" + var_name + "(" + init_meth_params + ") { ")
 818                                 out_java.write(init_meth_body)
 819                                 out_java.write("}\n")
 820                             out_java.write("\t\t}\n")
 821                             init_meth_jty_strs[var_name] = init_meth_jty_str
 822                     out_java.write("\tstatic { " + struct_name + ".init(); }\n")
 823                     out_java.write("\tpublic static native " + struct_name + " " + struct_name + "_ref_from_ptr(long ptr);\n");
 824
 825                     out_c.write("JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_00024" + struct_name.replace("_", "_1") + "_init (JNIEnv * env, jclass _a) {\n")
 826                     for idx, struct_line in enumerate(tag_field_lines):
 827                         if idx != 0 and idx < len(tag_field_lines) - 3:
 828                             var_name = struct_line.strip(' ,')[len(struct_name) + 1:]
 829                             out_c.write("\t" + struct_name + "_" + var_name + "_class =\n")
 830                             out_c.write("\t\t(*env)->NewGlobalRef(env, (*env)->FindClass(env, \"Lorg/ldk/impl/bindings$" + struct_name + "$" + var_name + ";\"));\n")
 831                             out_c.write("\tDO_ASSERT(" + struct_name + "_" + var_name + "_class != NULL);\n")
 832                             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")
 833                             out_c.write("\tDO_ASSERT(" + struct_name + "_" + var_name + "_meth != NULL);\n")
 834                     out_c.write("}\n")
 835                     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")
 836                     out_c.write("\t" + struct_name + " *obj = (" + struct_name + "*)ptr;\n")
 837                     out_c.write("\tswitch(obj->tag) {\n")
 838                     for idx, struct_line in enumerate(tag_field_lines):
 839                         if idx != 0 and idx < len(tag_field_lines) - 3:
 840                             var_name = struct_line.strip(' ,')[len(struct_name) + 1:]
 841                             out_c.write("\t\tcase " + struct_name + "_" + var_name + ": {\n")
 842                             c_params_text = ""
 843                             if "LDK" + var_name in union_enum_items[struct_name]:
 844                                 enum_var_lines = union_enum_items[struct_name]["LDK" + var_name]
 845                                 for idx, field in enumerate(enum_var_lines):
 846                                     if idx != 0 and idx < len(enum_var_lines) - 2:
 847                                         field_map = map_type(field.strip(' ;'), False, None, False)
 848                                         if field_map.ret_conv is not None:
 849                                             out_c.write("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t").replace("_env", "env"))
 850                                             out_c.write("obj->" + camel_to_snake(var_name) + "." + field_map.arg_name)
 851                                             out_c.write(field_map.ret_conv[1] + "\n")
 852                                             c_params_text = c_params_text + ", " + field_map.ret_conv_name
 853                                         else:
 854                                             c_params_text = c_params_text + ", obj->" + camel_to_snake(var_name) + "." + field_map.arg_name
 855                             out_c.write("\t\t\treturn (*env)->NewObject(env, " + struct_name + "_" + var_name + "_class, " + struct_name + "_" + var_name + "_meth" + c_params_text + ");\n")
 856                             out_c.write("\t\t}\n")
 857                     out_c.write("\t\tdefault: abort();\n")
 858                     out_c.write("\t}\n}\n")
 859                 elif is_unitary_enum:
 860                     with open(sys.argv[3] + "/" + struct_name + ".java", "w") as out_java_enum:
 861                         out_java_enum.write("package org.ldk.enums;\n\n")
 862                         unitary_enums.add(struct_name)
 863                         out_c.write("static inline " + struct_name + " " + struct_name + "_from_java(JNIEnv *env, jclass val) {\n")
 864                         out_c.write("\tswitch ((*env)->CallIntMethod(env, val, ordinal_meth)) {\n")
 865                         ord_v = 0
 866                         for idx, struct_line in enumerate(field_lines):
 867                             if idx == 0:
 868                                 out_java_enum.write("public enum " + struct_name + " {\n")
 869                             elif idx == len(field_lines) - 3:
 870                                 assert(struct_line.endswith("_Sentinel,"))
 871                             elif idx == len(field_lines) - 2:
 872                                 out_java_enum.write("\t; static native void init();\n")
 873                                 out_java_enum.write("\tstatic { init(); }\n")
 874                                 out_java_enum.write("}")
 875                                 out_java.write("\tstatic { " + struct_name + ".values(); /* Force enum statics to run */ }\n")
 876                             elif idx == len(field_lines) - 1:
 877                                 assert(struct_line == "")
 878                             else:
 879                                 out_java_enum.write(struct_line + "\n")
 880                                 out_c.write("\t\tcase %d: return %s;\n" % (ord_v, struct_line.strip().strip(",")))
 881                                 ord_v = ord_v + 1
 882                         out_c.write("\t}\n")
 883                         out_c.write("\tabort();\n")
 884                         out_c.write("}\n")
 885
 886                         ord_v = 0
 887                         out_c.write("static jclass " + struct_name + "_class = NULL;\n")
 888                         for idx, struct_line in enumerate(field_lines):
 889                             if idx > 0 and idx < len(field_lines) - 3:
 890                                 variant = struct_line.strip().strip(",")
 891                                 out_c.write("static jfieldID " + struct_name + "_" + variant + " = NULL;\n")
 892                         out_c.write("JNIEXPORT void JNICALL Java_org_ldk_enums_" + struct_name.replace("_", "_1") + "_init (JNIEnv * env, jclass clz) {\n")
 893                         out_c.write("\t" + struct_name + "_class = (*env)->NewGlobalRef(env, clz);\n")
 894                         out_c.write("\tDO_ASSERT(" + struct_name + "_class != NULL);\n")
 895                         for idx, struct_line in enumerate(field_lines):
 896                             if idx > 0 and idx < len(field_lines) - 3:
 897                                 variant = struct_line.strip().strip(",")
 898                                 out_c.write("\t" + struct_name + "_" + variant + " = (*env)->GetStaticFieldID(env, " + struct_name + "_class, \"" + variant + "\", \"Lorg/ldk/enums/" + struct_name + ";\");\n")
 899                                 out_c.write("\tDO_ASSERT(" + struct_name + "_" + variant + " != NULL);\n")
 900                         out_c.write("}\n")
 901                         out_c.write("static inline jclass " + struct_name + "_to_java(JNIEnv *env, " + struct_name + " val) {\n")
 902                         out_c.write("\tswitch (val) {\n")
 903                         for idx, struct_line in enumerate(field_lines):
 904                             if idx > 0 and idx < len(field_lines) - 3:
 905                                 variant = struct_line.strip().strip(",")
 906                                 out_c.write("\t\tcase " + variant + ":\n")
 907                                 out_c.write("\t\t\treturn (*env)->GetStaticObjectField(env, " + struct_name + "_class, " + struct_name + "_" + variant + ");\n")
 908                                 ord_v = ord_v + 1
 909                         out_c.write("\t\tdefault: abort();\n")
 910                         out_c.write("\t}\n")
 911                         out_c.write("}\n\n")
 912                 elif len(trait_fn_lines) > 0:
 913                     trait_structs.add(struct_name)
 914                     map_trait(struct_name, field_var_lines, trait_fn_lines)
 915                 cur_block_obj = None
 916         else:
 917             fn_ptr = fn_ptr_regex.match(line)
 918             fn_ret_arr = fn_ret_arr_regex.match(line)
 919             reg_fn = reg_fn_regex.match(line)
 920             const_val = const_val_regex.match(line)
 921
 922             if line.startswith("#include <"):
 923                 pass
 924             elif line.startswith("/*"):
 925                 #out_java.write("\t" + line)
 926                 if not line.endswith("*/\n"):
 927                     in_block_comment = True
 928             elif line.startswith("typedef enum "):
 929                 cur_block_obj = line
 930             elif line.startswith("typedef struct "):
 931                 cur_block_obj = line
 932             elif line.startswith("typedef union "):
 933                 cur_block_obj = line
 934             elif line.startswith("typedef "):
 935                 alias_match =  struct_alias_regex.match(line)
 936                 if alias_match.group(1) in result_templ_structs:
 937                     out_java.write("\tpublic static native boolean " + alias_match.group(2) + "_result_ok(long arg);\n")
 938                     out_java.write("\tpublic static native long " + alias_match.group(2) + "_get_inner(long arg);\n")
 939                     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")
 940                     out_c.write("\treturn ((" + alias_match.group(2) + "*)arg)->result_ok;\n")
 941                     out_c.write("}\n")
 942                     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")
 943                     out_c.write("\tif (((" + alias_match.group(2) + "*)arg)->result_ok) {\n")
 944                     out_c.write("\t\treturn (long)((" + alias_match.group(2) + "*)arg)->contents.result;\n")
 945                     out_c.write("\t} else {\n")
 946                     out_c.write("\t\treturn (long)((" + alias_match.group(2) + "*)arg)->contents.err;\n")
 947                     out_c.write("\t}\n}\n")
 948                 pass
 949             elif fn_ptr is not None:
 950                 map_fn(line, fn_ptr, None, None)
 951             elif fn_ret_arr is not None:
 952                 map_fn(line, fn_ret_arr, fn_ret_arr.group(4), None)
 953             elif reg_fn is not None:
 954                 map_fn(line, reg_fn, None, None)
 955             elif const_val_regex is not None:
 956                 # TODO Map const variables
 957                 pass
 958             else:
 959                 assert(line == "\n")
 960
 961     out_java.write("}\n")