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