_ Git - ldk-java/blob - genbindings.py

   1 #!/usr/bin/env python3
   2 import sys, re
   3
   4 if len(sys.argv) != 6:
   5     print("USAGE: /path/to/lightning.h /path/to/bindings/output.java /path/to/bindings/ /path/to/bindings/output.c debug")
   6     print("debug should be true or false and indicates whether to track allocations and ensure we don't leak")
   7     sys.exit(1)
   8
   9 class TypeInfo:
  10     def __init__(self, rust_obj, java_ty, java_fn_ty_arg, c_ty, passed_as_ptr, is_ptr, var_name, arr_len, arr_access):
  11         self.rust_obj = rust_obj
  12         self.java_ty = java_ty
  13         self.java_fn_ty_arg = java_fn_ty_arg
  14         self.c_ty = c_ty
  15         self.passed_as_ptr = passed_as_ptr
  16         self.is_ptr = is_ptr
  17         self.var_name = var_name
  18         self.arr_len = arr_len
  19         self.arr_access = arr_access
  20
  21 class ConvInfo:
  22     def __init__(self, ty_info, arg_name, arg_conv, arg_conv_name, arg_conv_cleanup, ret_conv, ret_conv_name):
  23         assert(ty_info.c_ty is not None)
  24         assert(ty_info.java_ty is not None)
  25         assert(arg_name is not None)
  26         self.passed_as_ptr = ty_info.passed_as_ptr
  27         self.rust_obj = ty_info.rust_obj
  28         self.c_ty = ty_info.c_ty
  29         self.java_ty = ty_info.java_ty
  30         self.java_fn_ty_arg = ty_info.java_fn_ty_arg
  31         self.arg_name = arg_name
  32         self.arg_conv = arg_conv
  33         self.arg_conv_name = arg_conv_name
  34         self.arg_conv_cleanup = arg_conv_cleanup
  35         self.ret_conv = ret_conv
  36         self.ret_conv_name = ret_conv_name
  37
  38     def print_ty(self):
  39         out_c.write(self.c_ty)
  40         out_java.write(self.java_ty)
  41
  42     def print_name(self):
  43         if self.arg_name != "":
  44             out_java.write(" " + self.arg_name)
  45             out_c.write(" " + self.arg_name)
  46         else:
  47             out_java.write(" arg")
  48             out_c.write(" arg")
  49
  50 def camel_to_snake(s):
  51     # Convert camel case to snake case, in a way that appears to match cbindgen
  52     con = "_"
  53     ret = ""
  54     lastchar = ""
  55     lastund = False
  56     for char in s:
  57         if lastchar.isupper():
  58             if not char.isupper() and not lastund:
  59                 ret = ret + "_"
  60                 lastund = True
  61             else:
  62                 lastund = False
  63             ret = ret + lastchar.lower()
  64         else:
  65             ret = ret + lastchar
  66             if char.isupper() and not lastund:
  67                 ret = ret + "_"
  68                 lastund = True
  69             else:
  70                 lastund = False
  71         lastchar = char
  72         if char.isnumeric():
  73             lastund = True
  74     return (ret + lastchar.lower()).strip("_")
  75
  76 unitary_enums = set()
  77 var_is_arr_regex = re.compile("\(\*([A-za-z0-9_]*)\)\[([a-z0-9]*)\]")
  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     arr_access = None
  92     if fn_arg.startswith("LDKThirtyTwoBytes"):
  93         fn_arg = "uint8_t (*" + fn_arg[18:] + ")[32]"
  94         assert var_is_arr_regex.match(fn_arg[8:])
  95         rust_obj = "LDKThirtyTwoBytes"
  96         arr_access = "data"
  97     if fn_arg.startswith("LDKPublicKey"):
  98         fn_arg = "uint8_t (*" + fn_arg[13:] + ")[33]"
  99         assert var_is_arr_regex.match(fn_arg[8:])
 100         rust_obj = "LDKPublicKey"
 101         arr_access = "compressed_form"
 102     if fn_arg.startswith("LDKSecretKey"):
 103         fn_arg = "uint8_t (*" + fn_arg[13:] + ")[32]"
 104         assert var_is_arr_regex.match(fn_arg[8:])
 105         rust_obj = "LDKSecretKey"
 106         arr_access = "bytes"
 107     if fn_arg.startswith("LDKSignature"):
 108         fn_arg = "uint8_t (*" + fn_arg[13:] + ")[64]"
 109         assert var_is_arr_regex.match(fn_arg[8:])
 110         rust_obj = "LDKSignature"
 111         arr_access = "compact_form"
 112     if fn_arg.startswith("LDKThreeBytes"):
 113         fn_arg = "uint8_t (*" + fn_arg[14:] + ")[3]"
 114         assert var_is_arr_regex.match(fn_arg[8:])
 115         rust_obj = "LDKThreeBytes"
 116         arr_access = "data"
 117     if fn_arg.startswith("LDKu8slice"):
 118         fn_arg = "uint8_t (*" + fn_arg[11:] + ")[datalen]"
 119         assert var_is_arr_regex.match(fn_arg[8:])
 120         rust_obj = "LDKu8slice"
 121         arr_access = "data"
 122
 123     if fn_arg.startswith("void"):
 124         java_ty = "void"
 125         c_ty = "void"
 126         fn_ty_arg = "V"
 127         fn_arg = fn_arg[4:].strip()
 128     elif fn_arg.startswith("bool"):
 129         java_ty = "boolean"
 130         c_ty = "jboolean"
 131         fn_ty_arg = "Z"
 132         fn_arg = fn_arg[4:].strip()
 133     elif fn_arg.startswith("uint8_t"):
 134         java_ty = "byte"
 135         c_ty = "jbyte"
 136         fn_ty_arg = "B"
 137         fn_arg = fn_arg[7:].strip()
 138     elif fn_arg.startswith("uint16_t"):
 139         java_ty = "short"
 140         c_ty = "jshort"
 141         fn_ty_arg = "S"
 142         fn_arg = fn_arg[8:].strip()
 143     elif fn_arg.startswith("uint32_t"):
 144         java_ty = "int"
 145         c_ty = "jint"
 146         fn_ty_arg = "I"
 147         fn_arg = fn_arg[8:].strip()
 148     elif fn_arg.startswith("uint64_t") or fn_arg.startswith("uintptr_t"):
 149         java_ty = "long"
 150         c_ty = "jlong"
 151         fn_ty_arg = "J"
 152         if fn_arg.startswith("uint64_t"):
 153             fn_arg = fn_arg[8:].strip()
 154         else:
 155             fn_arg = fn_arg[9:].strip()
 156     elif is_const and fn_arg.startswith("char *"):
 157         java_ty = "String"
 158         c_ty = "const char*"
 159         fn_ty_arg = "Ljava/lang/String;"
 160         fn_arg = fn_arg[6:].strip()
 161     else:
 162         ma = var_ty_regex.match(fn_arg)
 163         if ma.group(1).strip() in unitary_enums:
 164             java_ty = ma.group(1).strip()
 165             c_ty = "jclass"
 166             fn_ty_arg = "Lorg/ldk/enums/" + ma.group(1).strip() + ";"
 167             fn_arg = ma.group(2).strip()
 168             rust_obj = ma.group(1).strip()
 169             take_by_ptr = True
 170         else:
 171             java_ty = "long"
 172             c_ty = "jlong"
 173             fn_ty_arg = "J"
 174             fn_arg = ma.group(2).strip()
 175             rust_obj = ma.group(1).strip()
 176             take_by_ptr = True
 177
 178     if fn_arg.startswith(" *") or fn_arg.startswith("*"):
 179         fn_arg = fn_arg.replace("*", "").strip()
 180         is_ptr = True
 181         c_ty = "jlong"
 182         java_ty = "long"
 183         fn_ty_arg = "J"
 184
 185     var_is_arr = var_is_arr_regex.match(fn_arg)
 186     if var_is_arr is not None or ret_arr_len is not None:
 187         assert(not take_by_ptr)
 188         assert(not is_ptr)
 189         java_ty = java_ty + "[]"
 190         c_ty = c_ty + "Array"
 191         if var_is_arr is not None:
 192             if var_is_arr.group(1) == "":
 193                 return TypeInfo(rust_obj=rust_obj, java_ty=java_ty, java_fn_ty_arg="[" + fn_ty_arg, c_ty=c_ty,
 194                     passed_as_ptr=False, is_ptr=False, var_name="arg", arr_len=var_is_arr.group(2), arr_access=arr_access)
 195             return TypeInfo(rust_obj=rust_obj, java_ty=java_ty, java_fn_ty_arg="[" + fn_ty_arg, c_ty=c_ty,
 196                 passed_as_ptr=False, is_ptr=False, var_name=var_is_arr.group(1), arr_len=var_is_arr.group(2), arr_access=arr_access)
 197     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,
 198         is_ptr=is_ptr, var_name=fn_arg, arr_len=None, arr_access=None)
 199
 200
 201
 202 fn_ptr_regex = re.compile("^extern const ([A-Za-z_0-9\* ]*) \(\*(.*)\)\((.*)\);$")
 203 fn_ret_arr_regex = re.compile("(.*) \(\*(.*)\((.*)\)\)\[([0-9]*)\];$")
 204 reg_fn_regex = re.compile("([A-Za-z_0-9\* ]* \*?)([a-zA-Z_0-9]*)\((.*)\);$")
 205 clone_fns = set()
 206 constructor_fns = {}
 207 with open(sys.argv[1]) as in_h:
 208     for line in in_h:
 209         reg_fn = reg_fn_regex.match(line)
 210         if reg_fn is not None:
 211             if reg_fn.group(2).endswith("_clone"):
 212                 clone_fns.add(reg_fn.group(2))
 213             else:
 214                 rty = java_c_types(reg_fn.group(1), None)
 215                 if rty.rust_obj is not None and reg_fn.group(2) == rty.rust_obj.replace("LDK", "") + "_new":
 216                     constructor_fns[rty.rust_obj] = reg_fn.group(3)
 217             continue
 218         arr_fn = fn_ret_arr_regex.match(line)
 219         if arr_fn is not None:
 220             if arr_fn.group(2).endswith("_clone"):
 221                 clone_fns.add(arr_fn.group(2))
 222             # No object constructors return arrays, as then they wouldn't be an object constructor
 223             continue
 224
 225 with open(sys.argv[1]) as in_h, open(sys.argv[2], "w") as out_java, open(sys.argv[4], "w") as out_c:
 226     opaque_structs = set()
 227     trait_structs = set()
 228
 229     def map_type(fn_arg, print_void, ret_arr_len, is_free):
 230         ty_info = java_c_types(fn_arg, ret_arr_len)
 231
 232         if ty_info.c_ty == "void":
 233             if not print_void:
 234                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 235                     arg_conv = None, arg_conv_name = None, arg_conv_cleanup = None,
 236                     ret_conv = None, ret_conv_name = None)
 237
 238         if ty_info.c_ty.endswith("Array"):
 239             arr_len = ty_info.arr_len
 240             if arr_len is not None:
 241                 arr_name = ty_info.var_name
 242             else:
 243                 arr_name = "ret"
 244                 arr_len = ret_arr_len
 245             assert(ty_info.c_ty == "jbyteArray")
 246             ret_conv = ("jbyteArray " + arr_name + "_arr = (*_env)->NewByteArray(_env, " + arr_len + ");\n" + "(*_env)->SetByteArrayRegion(_env, " + arr_name + "_arr, 0, " + arr_len + ", ", "")
 247             arg_conv_cleanup = None
 248             if not arr_len.isdigit():
 249                 arg_conv = ty_info.rust_obj + " " + arr_name + "_ref;\n"
 250                 arg_conv = arg_conv + arr_name + "_ref." + ty_info.arr_access + " = (*_env)->GetByteArrayElements (_env, " + arr_name + ", NULL);\n"
 251                 arg_conv = arg_conv + arr_name + "_ref." + arr_len + " = (*_env)->GetArrayLength (_env, " + arr_name + ");"
 252                 arg_conv_cleanup = "(*_env)->ReleaseByteArrayElements(_env, " + arr_name + ", (int8_t*)" + arr_name + "_ref." + ty_info.arr_access + ", 0);"
 253                 arr_access = "." + ty_info.arr_access
 254                 ret_conv = (ty_info.rust_obj + " " + arr_name + "_var = ", "")
 255                 ret_conv = (ret_conv[0], ";\njbyteArray " + arr_name + "_arr = (*_env)->NewByteArray(_env, " + arr_name + "_var." + arr_len + ");\n")
 256                 ret_conv = (ret_conv[0], ret_conv[1] + "(*_env)->SetByteArrayRegion(_env, " + arr_name + "_arr, 0, " + arr_name + "_var." + arr_len + ", " + arr_name + "_var." + ty_info.arr_access + ");")
 257             elif ty_info.rust_obj is not None:
 258                 arg_conv = ty_info.rust_obj + " " + arr_name + "_ref;\n"
 259                 arg_conv = arg_conv + "CHECK((*_env)->GetArrayLength (_env, " + arr_name + ") == " + arr_len + ");\n"
 260                 arg_conv = arg_conv + "(*_env)->GetByteArrayRegion (_env, " + arr_name + ", 0, " + arr_len + ", " + arr_name + "_ref." + ty_info.arr_access + ");"
 261                 ret_conv = (ret_conv[0], "." + ty_info.arr_access + ");")
 262             else:
 263                 arg_conv = "unsigned char " + arr_name + "_arr[" + arr_len + "];\n"
 264                 arg_conv = arg_conv + "CHECK((*_env)->GetArrayLength (_env, " + arr_name + ") == " + arr_len + ");\n"
 265                 arg_conv = arg_conv + "(*_env)->GetByteArrayRegion (_env, " + arr_name + ", 0, " + arr_len + ", " + arr_name + "_arr);\n" + "unsigned char (*" + arr_name + "_ref)[" + arr_len + "] = &" + arr_name + "_arr;"
 266                 ret_conv = (ret_conv[0] + "*", ");")
 267             return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 268                 arg_conv = arg_conv, arg_conv_name = arr_name + "_ref", arg_conv_cleanup = arg_conv_cleanup,
 269                 ret_conv = ret_conv, ret_conv_name = arr_name + "_arr")
 270         elif ty_info.var_name != "":
 271             # If we have a parameter name, print it (noting that it may indicate its a pointer)
 272             if ty_info.rust_obj is not None:
 273                 assert(ty_info.passed_as_ptr)
 274                 opaque_arg_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv;\n"
 275                 opaque_arg_conv = opaque_arg_conv + ty_info.var_name + "_conv.inner = (void*)(" + ty_info.var_name + " & (~1));\n"
 276                 opaque_arg_conv = opaque_arg_conv + ty_info.var_name + "_conv.is_owned = (" + ty_info.var_name + " & 1) || (" + ty_info.var_name + " == 0);"
 277                 if not ty_info.is_ptr and not is_free:
 278                     if (ty_info.rust_obj.replace("LDK", "") + "_clone") in clone_fns:
 279                         # TODO: This is a bit too naive, even with the checks above, we really need to know if rust wants a ref or not, not just if its pass as a ptr.
 280                         opaque_arg_conv = opaque_arg_conv + "\nif (" + ty_info.var_name + "_conv.inner != NULL)\n"
 281                         opaque_arg_conv = opaque_arg_conv + "\t" + ty_info.var_name + "_conv = " + ty_info.rust_obj.replace("LDK", "") + "_clone(&" + ty_info.var_name + "_conv);"
 282                     elif ty_info.passed_as_ptr:
 283                         opaque_arg_conv = opaque_arg_conv + "\n// Warning: we may need a move here but can't clone!"
 284                 if not ty_info.is_ptr:
 285                     if ty_info.rust_obj in unitary_enums:
 286                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 287                             arg_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv = " + ty_info.rust_obj + "_from_java(_env, " + ty_info.var_name + ");",
 288                             arg_conv_name = ty_info.var_name + "_conv",
 289                             arg_conv_cleanup = None,
 290                             ret_conv = ("jclass " + ty_info.var_name + "_conv = " + ty_info.rust_obj + "_to_java(_env, ", ");"),
 291                             ret_conv_name = ty_info.var_name + "_conv")
 292                     if ty_info.rust_obj in opaque_structs:
 293                         ret_conv_suf = ";\nCHECK((((long)" + ty_info.var_name + "_var.inner) & 1) == 0); // We rely on a free low bit, malloc guarantees this.\n"
 294                         ret_conv_suf = ret_conv_suf + "CHECK((((long)&" + ty_info.var_name + "_var) & 1) == 0); // We rely on a free low bit, pointer alignment guarantees this.\n"
 295                         ret_conv_suf = ret_conv_suf + "long " + ty_info.var_name + "_ref;\n"
 296                         ret_conv_suf = ret_conv_suf + "if (" + ty_info.var_name + "_var.is_owned) {\n"
 297                         ret_conv_suf = ret_conv_suf + "\t" + ty_info.var_name + "_ref = (long)" + ty_info.var_name + "_var.inner | 1;\n"
 298                         ret_conv_suf = ret_conv_suf + "} else {\n"
 299                         ret_conv_suf = ret_conv_suf + "\t" + ty_info.var_name + "_ref = (long)&" + ty_info.var_name + "_var;\n"
 300                         ret_conv_suf = ret_conv_suf + "}"
 301                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 302                             arg_conv = opaque_arg_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 303                             ret_conv = (ty_info.rust_obj + " " + ty_info.var_name + "_var = ", ret_conv_suf),
 304                             ret_conv_name = ty_info.var_name + "_ref")
 305                     base_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv = *(" + ty_info.rust_obj + "*)" + ty_info.var_name + ";";
 306                     if ty_info.rust_obj in trait_structs:
 307                         if not is_free:
 308                             base_conv = base_conv + "\nif (" + ty_info.var_name + "_conv.free == " + ty_info.rust_obj + "_JCalls_free) {\n"
 309                             base_conv = base_conv + "\t// If this_arg is a JCalls struct, then we need to increment the refcnt in it.\n"
 310                             base_conv = base_conv + "\t" + ty_info.rust_obj + "_JCalls_clone(" + ty_info.var_name + "_conv.this_arg);\n}"
 311                         else:
 312                             base_conv = base_conv + "\n" + "FREE((void*)" + ty_info.var_name + ");"
 313                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 314                             arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 315                             ret_conv = ("CANT PASS TRAIT TO Java?", ""), ret_conv_name = "NO CONV POSSIBLE")
 316                     if ty_info.rust_obj != "LDKu8slice":
 317                         # Don't bother free'ing slices passed in - Rust doesn't auto-free the
 318                         # underlying unlike Vecs, and it gives Java more freedom.
 319                         base_conv = base_conv + "\nFREE((void*)" + ty_info.var_name + ");";
 320                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 321                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 322                         ret_conv = ("long " + ty_info.var_name + "_ref = (long)&", ";"), ret_conv_name = ty_info.var_name + "_ref")
 323                 else:
 324                     assert(not is_free)
 325                     if ty_info.rust_obj in opaque_structs:
 326                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 327                             arg_conv = opaque_arg_conv, arg_conv_name = "&" + ty_info.var_name + "_conv", arg_conv_cleanup = None,
 328                             ret_conv = None, ret_conv_name = None) # its a pointer, no conv needed
 329                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 330                         arg_conv = ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)" + ty_info.var_name + ";",
 331                         arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 332                         ret_conv = None, ret_conv_name = None) # its a pointer, no conv needed
 333             elif ty_info.is_ptr:
 334                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 335                     arg_conv = None, arg_conv_name = ty_info.var_name, arg_conv_cleanup = None, ret_conv = None, ret_conv_name = None)
 336             elif ty_info.java_ty == "String":
 337                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 338                     arg_conv = None, arg_conv_name = None, arg_conv_cleanup = None,
 339                     ret_conv = ("jstring " + ty_info.var_name + "_conv = (*_env)->NewStringUTF(_env, ", ");"), ret_conv_name = ty_info.var_name + "_conv")
 340             else:
 341                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 342                     arg_conv = None, arg_conv_name = ty_info.var_name, arg_conv_cleanup = None, ret_conv = None, ret_conv_name = None)
 343         elif not print_void:
 344             # We don't have a parameter name, and want one, just call it arg
 345             if ty_info.rust_obj is not None:
 346                 assert(not is_free or ty_info.rust_obj not in opaque_structs);
 347                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 348                     arg_conv = ty_info.rust_obj + " arg_conv = *(" + ty_info.rust_obj + "*)arg;\nFREE((void*)arg);",
 349                     arg_conv_name = "arg_conv", arg_conv_cleanup = None,
 350                     ret_conv = None, ret_conv_name = None)
 351             else:
 352                 assert(not is_free)
 353                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 354                     arg_conv = None, arg_conv_name = "arg", arg_conv_cleanup = None, ret_conv = None, ret_conv_name = None)
 355         else:
 356             # We don't have a parameter name, and don't want one (cause we're returning)
 357             if ty_info.rust_obj is not None:
 358                 if not ty_info.is_ptr:
 359                     if ty_info.rust_obj in unitary_enums:
 360                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 361                             arg_conv = ty_info.rust_obj + " ret = " + ty_info.rust_obj + "_from_java(_env, " + ty_info.var_name + ");",
 362                             arg_conv_name = "ret", arg_conv_cleanup = None,
 363                             ret_conv = ("jclass ret = " + ty_info.rust_obj + "_to_java(_env, ", ");"), ret_conv_name = "ret")
 364                     if ty_info.rust_obj in opaque_structs:
 365                         # If we're returning a newly-allocated struct, we don't want Rust to ever
 366                         # free, instead relying on the Java GC to lose the ref. We undo this in
 367                         # any _free function.
 368                         # To avoid any issues, we first assert that the incoming object is non-ref.
 369                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 370                             ret_conv = (ty_info.rust_obj + " ret = ", ";"),
 371                             ret_conv_name = "((long)ret.inner) | (ret.is_owned ? 1 : 0)",
 372                             arg_conv = None, arg_conv_name = None, arg_conv_cleanup = None)
 373                     else:
 374                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 375                             ret_conv = (ty_info.rust_obj + "* ret = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n*ret = ", ";"),
 376                             ret_conv_name = "(long)ret",
 377                             arg_conv = None, arg_conv_name = None, arg_conv_cleanup = None)
 378                 else:
 379                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 380                         ret_conv = ("long ret = (long)", ";"), ret_conv_name = "ret",
 381                         arg_conv = None, arg_conv_name = None, arg_conv_cleanup = None)
 382             else:
 383                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 384                     arg_conv = None, arg_conv_name = None, arg_conv_cleanup = None, ret_conv = None, ret_conv_name = None)
 385
 386     def map_fn(line, re_match, ret_arr_len, c_call_string):
 387         out_java.write("\t// " + line)
 388         out_java.write("\tpublic static native ")
 389         out_c.write("JNIEXPORT ")
 390
 391         is_free = re_match.group(2).endswith("_free")
 392         struct_meth = re_match.group(2).split("_")[0]
 393
 394         ret_info = map_type(re_match.group(1), True, ret_arr_len, False)
 395         ret_info.print_ty()
 396
 397         if ret_info.ret_conv is not None:
 398             ret_conv_pfx, ret_conv_sfx = ret_info.ret_conv
 399
 400         out_java.write(" " + re_match.group(2) + "(")
 401         out_c.write(" JNICALL Java_org_ldk_impl_bindings_" + re_match.group(2).replace('_', '_1') + "(JNIEnv * _env, jclass _b")
 402
 403         arg_names = []
 404         default_constructor_args = {}
 405         takes_self = False
 406         args_known = not ret_info.passed_as_ptr or ret_info.rust_obj in opaque_structs or ret_info.rust_obj in trait_structs
 407         for idx, arg in enumerate(re_match.group(3).split(',')):
 408             if idx != 0:
 409                 out_java.write(", ")
 410             if arg != "void":
 411                 out_c.write(", ")
 412             arg_conv_info = map_type(arg, False, None, is_free)
 413             if arg_conv_info.c_ty != "void":
 414                 arg_conv_info.print_ty()
 415                 arg_conv_info.print_name()
 416             if arg_conv_info.arg_name == "this_arg":
 417                 takes_self = True
 418             if arg_conv_info.passed_as_ptr and not arg_conv_info.rust_obj in opaque_structs:
 419                 if not arg_conv_info.rust_obj in trait_structs and not arg_conv_info.rust_obj in unitary_enums:
 420                     args_known = False
 421             if arg_conv_info.arg_conv is not None and "Warning" in arg_conv_info.arg_conv:
 422                 if arg_conv_info.rust_obj in constructor_fns:
 423                     assert not is_free
 424                     for explode_arg in constructor_fns[arg_conv_info.rust_obj].split(','):
 425                         explode_arg_conv = map_type(explode_arg, False, None, False)
 426                         if explode_arg_conv.c_ty == "void":
 427                             # We actually want to handle this case, but for now its only used in NetGraphMsgHandler::new()
 428                             # which ends up resulting in a redundant constructor - both without arguments for the NetworkGraph.
 429                             args_known = False
 430                         assert explode_arg_conv.arg_name != "this_arg"
 431                         if explode_arg_conv.passed_as_ptr and not explode_arg_conv.rust_obj in trait_structs:
 432                             args_known = False
 433                         if not arg_conv_info.arg_name in default_constructor_args:
 434                             default_constructor_args[arg_conv_info.arg_name] = []
 435                         default_constructor_args[arg_conv_info.arg_name].append(explode_arg_conv)
 436                 else:
 437                     args_known = False
 438             arg_names.append(arg_conv_info)
 439
 440         out_java_struct = None
 441         if ("LDK" + struct_meth in opaque_structs or "LDK" + struct_meth in trait_structs) and not is_free:
 442             out_java_struct = open(sys.argv[3] + "/structs/" + struct_meth + ".java", "a")
 443             if not args_known:
 444                 out_java_struct.write("\t// Skipped " + re_match.group(2) + "\n")
 445                 out_java_struct.close()
 446                 out_java_struct = None
 447             else:
 448                 out_java_struct.write("\tpublic ")
 449                 meth_n = re_match.group(2)[len(struct_meth) + 1:]
 450                 if ret_info.rust_obj == "LDK" + struct_meth:
 451                     out_java_struct.write(struct_meth + "(")
 452                 elif ret_info.rust_obj in opaque_structs or ret_info.rust_obj in trait_structs:
 453                     out_java_struct.write(ret_info.rust_obj.replace("LDK", "") + " " + meth_n + "(")
 454                 else:
 455                     out_java_struct.write(ret_info.java_ty + " " + meth_n + "(")
 456                 for idx, arg in enumerate(arg_names):
 457                     if idx != 0:
 458                         if not takes_self or idx > 1:
 459                             out_java_struct.write(", ")
 460                     if arg.java_ty != "void" and arg.arg_name != "this_arg":
 461                         if arg.arg_name in default_constructor_args:
 462                             for explode_idx, explode_arg in enumerate(default_constructor_args[arg.arg_name]):
 463                                 if explode_idx != 0:
 464                                     out_java_struct.write(", ")
 465                                 assert explode_arg.rust_obj in opaque_structs or explode_arg.rust_obj in trait_structs
 466                                 out_java_struct.write(explode_arg.rust_obj.replace("LDK", "") + " " + arg.arg_name + "_" + explode_arg.arg_name)
 467                         elif arg.passed_as_ptr:
 468                             if arg.rust_obj in opaque_structs or arg.rust_obj in trait_structs:
 469                                 out_java_struct.write(arg.rust_obj.replace("LDK", "") + " " + arg.arg_name)
 470                             else:
 471                                 out_java_struct.write(arg.rust_obj + " " + arg.arg_name)
 472                         else:
 473                             out_java_struct.write(arg.java_ty + " " + arg.arg_name)
 474
 475
 476         out_java.write(");\n")
 477         out_c.write(") {\n")
 478         if out_java_struct is not None:
 479             out_java_struct.write(") {\n")
 480
 481         for info in arg_names:
 482             if info.arg_conv is not None:
 483                 out_c.write("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
 484
 485         if ret_info.ret_conv is not None:
 486             out_c.write("\t" + ret_conv_pfx.replace('\n', '\n\t'))
 487         elif ret_info.c_ty != "void":
 488             out_c.write("\t" + ret_info.c_ty + " ret_val = ")
 489         else:
 490             out_c.write("\t")
 491
 492         if c_call_string is None:
 493             out_c.write(re_match.group(2) + "(")
 494         else:
 495             out_c.write(c_call_string)
 496         for idx, info in enumerate(arg_names):
 497             if info.arg_conv_name is not None:
 498                 if idx != 0:
 499                     out_c.write(", ")
 500                 elif c_call_string is not None:
 501                     continue
 502                 out_c.write(info.arg_conv_name)
 503         out_c.write(")")
 504         if ret_info.ret_conv is not None:
 505             out_c.write(ret_conv_sfx.replace('\n', '\n\t'))
 506         else:
 507             out_c.write(";")
 508         for info in arg_names:
 509             if info.arg_conv_cleanup is not None:
 510                 out_c.write("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
 511         if ret_info.ret_conv is not None:
 512             out_c.write("\n\treturn " + ret_info.ret_conv_name + ";")
 513         elif ret_info.c_ty != "void":
 514             out_c.write("\n\treturn ret_val;")
 515         out_c.write("\n}\n\n")
 516         if out_java_struct is not None:
 517             out_java_struct.write("\t\t")
 518             if ret_info.rust_obj == "LDK" + struct_meth:
 519                 out_java_struct.write("super(")
 520             elif ret_info.java_ty != "void" and not ret_info.passed_as_ptr:
 521                 out_java_struct.write(ret_info.java_ty + " ret = ")
 522             elif ret_info.java_ty != "void":
 523                 out_java_struct.write(ret_info.rust_obj.replace("LDK", "") + " ret = ")
 524                 if ret_info.rust_obj in opaque_structs or ret_info.rust_obj in trait_structs:
 525                     out_java_struct.write("new " + ret_info.rust_obj.replace("LDK", "") + "(null, ")
 526             out_java_struct.write("bindings." + re_match.group(2) + "(")
 527             for idx, info in enumerate(arg_names):
 528                 if idx != 0:
 529                     out_java_struct.write(", ")
 530                 if info.arg_name == "this_arg":
 531                     out_java_struct.write("this.ptr")
 532                 elif info.arg_name in default_constructor_args:
 533                     out_java_struct.write("bindings." + info.rust_obj.replace("LDK", "") + "_new(")
 534                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
 535                         if explode_idx != 0:
 536                             out_java_struct.write(", ")
 537                         assert explode_arg.passed_as_ptr and explode_arg.rust_obj in trait_structs
 538                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
 539                         out_java_struct.write(expl_arg_name + " == null ? 0 : " + expl_arg_name + ".ptr")
 540                     out_java_struct.write(")")
 541                 elif info.passed_as_ptr and info.rust_obj in opaque_structs:
 542                     out_java_struct.write(info.arg_name + " == null ? 0 : " + info.arg_name + ".ptr & ~1")
 543                 elif info.passed_as_ptr and info.rust_obj in trait_structs:
 544                     out_java_struct.write(info.arg_name + " == null ? 0 : " + info.arg_name + ".ptr")
 545                 else:
 546                     out_java_struct.write(info.arg_name)
 547             out_java_struct.write(")")
 548             if ret_info.rust_obj == "LDK" + struct_meth:
 549                 out_java_struct.write(");\n")
 550             elif ret_info.rust_obj in opaque_structs:
 551                 out_java_struct.write(");\n")
 552             elif ret_info.rust_obj in trait_structs:
 553                 out_java_struct.write(");\n\t\tret.ptrs_to.add(this);\n")
 554             else:
 555                 out_java_struct.write(";\n")
 556
 557             for info in arg_names:
 558                 if info.arg_name == "this_arg":
 559                     pass
 560                 elif info.arg_name in default_constructor_args:
 561                     for explode_arg in default_constructor_args[info.arg_name]:
 562                         out_java_struct.write("\t\tthis.ptrs_to.add(" + info.arg_name + "_" + explode_arg.arg_name + ");\n")
 563                 elif info.passed_as_ptr and (info.rust_obj in opaque_structs or info.rust_obj in trait_structs):
 564                     out_java_struct.write("\t\tthis.ptrs_to.add(" + info.arg_name + ");\n")
 565
 566             if ret_info.java_ty != "void" and ret_info.rust_obj != "LDK" + struct_meth:
 567                 out_java_struct.write("\t\treturn ret;\n")
 568             out_java_struct.write("\t}\n\n")
 569             out_java_struct.close()
 570
 571     def map_unitary_enum(struct_name, field_lines):
 572         with open(sys.argv[3] + "/enums/" + struct_name + ".java", "w") as out_java_enum:
 573             out_java_enum.write("package org.ldk.enums;\n\n")
 574             unitary_enums.add(struct_name)
 575             out_c.write("static inline " + struct_name + " " + struct_name + "_from_java(JNIEnv *env, jclass val) {\n")
 576             out_c.write("\tswitch ((*env)->CallIntMethod(env, val, ordinal_meth)) {\n")
 577             ord_v = 0
 578             for idx, struct_line in enumerate(field_lines):
 579                 if idx == 0:
 580                     out_java_enum.write("public enum " + struct_name + " {\n")
 581                 elif idx == len(field_lines) - 3:
 582                     assert(struct_line.endswith("_Sentinel,"))
 583                 elif idx == len(field_lines) - 2:
 584                     out_java_enum.write("\t; static native void init();\n")
 585                     out_java_enum.write("\tstatic { init(); }\n")
 586                     out_java_enum.write("}")
 587                     out_java.write("\tstatic { " + struct_name + ".values(); /* Force enum statics to run */ }\n")
 588                 elif idx == len(field_lines) - 1:
 589                     assert(struct_line == "")
 590                 else:
 591                     out_java_enum.write(struct_line + "\n")
 592                     out_c.write("\t\tcase %d: return %s;\n" % (ord_v, struct_line.strip().strip(",")))
 593                     ord_v = ord_v + 1
 594             out_c.write("\t}\n")
 595             out_c.write("\tabort();\n")
 596             out_c.write("}\n")
 597
 598             ord_v = 0
 599             out_c.write("static jclass " + struct_name + "_class = NULL;\n")
 600             for idx, struct_line in enumerate(field_lines):
 601                 if idx > 0 and idx < len(field_lines) - 3:
 602                     variant = struct_line.strip().strip(",")
 603                     out_c.write("static jfieldID " + struct_name + "_" + variant + " = NULL;\n")
 604             out_c.write("JNIEXPORT void JNICALL Java_org_ldk_enums_" + struct_name.replace("_", "_1") + "_init (JNIEnv * env, jclass clz) {\n")
 605             out_c.write("\t" + struct_name + "_class = (*env)->NewGlobalRef(env, clz);\n")
 606             out_c.write("\tCHECK(" + struct_name + "_class != NULL);\n")
 607             for idx, struct_line in enumerate(field_lines):
 608                 if idx > 0 and idx < len(field_lines) - 3:
 609                     variant = struct_line.strip().strip(",")
 610                     out_c.write("\t" + struct_name + "_" + variant + " = (*env)->GetStaticFieldID(env, " + struct_name + "_class, \"" + variant + "\", \"Lorg/ldk/enums/" + struct_name + ";\");\n")
 611                     out_c.write("\tCHECK(" + struct_name + "_" + variant + " != NULL);\n")
 612             out_c.write("}\n")
 613             out_c.write("static inline jclass " + struct_name + "_to_java(JNIEnv *env, " + struct_name + " val) {\n")
 614             out_c.write("\tswitch (val) {\n")
 615             for idx, struct_line in enumerate(field_lines):
 616                 if idx > 0 and idx < len(field_lines) - 3:
 617                     variant = struct_line.strip().strip(",")
 618                     out_c.write("\t\tcase " + variant + ":\n")
 619                     out_c.write("\t\t\treturn (*env)->GetStaticObjectField(env, " + struct_name + "_class, " + struct_name + "_" + variant + ");\n")
 620                     ord_v = ord_v + 1
 621             out_c.write("\t\tdefault: abort();\n")
 622             out_c.write("\t}\n")
 623             out_c.write("}\n\n")
 624
 625     def map_complex_enum(struct_name, union_enum_items):
 626         tag_field_lines = union_enum_items["field_lines"]
 627         init_meth_jty_strs = {}
 628         for idx, struct_line in enumerate(tag_field_lines):
 629             if idx == 0:
 630                 out_java.write("\tpublic static class " + struct_name + " {\n")
 631                 out_java.write("\t\tprivate " + struct_name + "() {}\n")
 632             elif idx == len(tag_field_lines) - 3:
 633                 assert(struct_line.endswith("_Sentinel,"))
 634             elif idx == len(tag_field_lines) - 2:
 635                 out_java.write("\t\tstatic native void init();\n")
 636                 out_java.write("\t}\n")
 637             elif idx == len(tag_field_lines) - 1:
 638                 assert(struct_line == "")
 639             else:
 640                 var_name = struct_line.strip(' ,')[len(struct_name) + 1:]
 641                 out_java.write("\t\tpublic final static class " + var_name + " extends " + struct_name + " {\n")
 642                 out_c.write("static jclass " + struct_name + "_" + var_name + "_class = NULL;\n")
 643                 out_c.write("static jmethodID " + struct_name + "_" + var_name + "_meth = NULL;\n")
 644                 init_meth_jty_str = ""
 645                 init_meth_params = ""
 646                 init_meth_body = ""
 647                 if "LDK" + var_name in union_enum_items:
 648                     enum_var_lines = union_enum_items["LDK" + var_name]
 649                     for idx, field in enumerate(enum_var_lines):
 650                         if idx != 0 and idx < len(enum_var_lines) - 2:
 651                             field_ty = java_c_types(field.strip(' ;'), None)
 652                             out_java.write("\t\t\tpublic " + field_ty.java_ty + " " + field_ty.var_name + ";\n")
 653                             init_meth_jty_str = init_meth_jty_str + field_ty.java_fn_ty_arg
 654                             if idx > 1:
 655                                 init_meth_params = init_meth_params + ", "
 656                             init_meth_params = init_meth_params + field_ty.java_ty + " " + field_ty.var_name
 657                             init_meth_body = init_meth_body + "this." + field_ty.var_name + " = " + field_ty.var_name + "; "
 658                     out_java.write("\t\t\t" + var_name + "(" + init_meth_params + ") { ")
 659                     out_java.write(init_meth_body)
 660                     out_java.write("}\n")
 661                 out_java.write("\t\t}\n")
 662                 init_meth_jty_strs[var_name] = init_meth_jty_str
 663         out_java.write("\tstatic { " + struct_name + ".init(); }\n")
 664         out_java.write("\tpublic static native " + struct_name + " " + struct_name + "_ref_from_ptr(long ptr);\n");
 665
 666         out_c.write("JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_00024" + struct_name.replace("_", "_1") + "_init (JNIEnv * env, jclass _a) {\n")
 667         for idx, struct_line in enumerate(tag_field_lines):
 668             if idx != 0 and idx < len(tag_field_lines) - 3:
 669                 var_name = struct_line.strip(' ,')[len(struct_name) + 1:]
 670                 out_c.write("\t" + struct_name + "_" + var_name + "_class =\n")
 671                 out_c.write("\t\t(*env)->NewGlobalRef(env, (*env)->FindClass(env, \"Lorg/ldk/impl/bindings$" + struct_name + "$" + var_name + ";\"));\n")
 672                 out_c.write("\tCHECK(" + struct_name + "_" + var_name + "_class != NULL);\n")
 673                 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")
 674                 out_c.write("\tCHECK(" + struct_name + "_" + var_name + "_meth != NULL);\n")
 675         out_c.write("}\n")
 676         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")
 677         out_c.write("\t" + struct_name + " *obj = (" + struct_name + "*)ptr;\n")
 678         out_c.write("\tswitch(obj->tag) {\n")
 679         for idx, struct_line in enumerate(tag_field_lines):
 680             if idx != 0 and idx < len(tag_field_lines) - 3:
 681                 var_name = struct_line.strip(' ,')[len(struct_name) + 1:]
 682                 out_c.write("\t\tcase " + struct_name + "_" + var_name + ": {\n")
 683                 c_params_text = ""
 684                 if "LDK" + var_name in union_enum_items:
 685                     enum_var_lines = union_enum_items["LDK" + var_name]
 686                     for idx, field in enumerate(enum_var_lines):
 687                         if idx != 0 and idx < len(enum_var_lines) - 2:
 688                             field_map = map_type(field.strip(' ;'), False, None, False)
 689                             if field_map.ret_conv is not None:
 690                                 out_c.write("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t").replace("_env", "env"))
 691                                 out_c.write("obj->" + camel_to_snake(var_name) + "." + field_map.arg_name)
 692                                 out_c.write(field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
 693                                 c_params_text = c_params_text + ", " + field_map.ret_conv_name
 694                             else:
 695                                 c_params_text = c_params_text + ", obj->" + camel_to_snake(var_name) + "." + field_map.arg_name
 696                 out_c.write("\t\t\treturn (*env)->NewObject(env, " + struct_name + "_" + var_name + "_class, " + struct_name + "_" + var_name + "_meth" + c_params_text + ");\n")
 697                 out_c.write("\t\t}\n")
 698         out_c.write("\t\tdefault: abort();\n")
 699         out_c.write("\t}\n}\n")
 700
 701     def map_trait(struct_name, field_var_lines, trait_fn_lines):
 702         with open(sys.argv[3] + "/structs/" + struct_name.replace("LDK","") + ".java", "w") as out_java_trait:
 703             out_c.write("typedef struct " + struct_name + "_JCalls {\n")
 704             out_c.write("\tatomic_size_t refcnt;\n")
 705             out_c.write("\tJavaVM *vm;\n")
 706             out_c.write("\tjweak o;\n")
 707             for var_line in field_var_lines:
 708                 if var_line.group(1) in trait_structs:
 709                     out_c.write("\t" + var_line.group(1) + "_JCalls* " + var_line.group(2) + ";\n")
 710             for fn_line in trait_fn_lines:
 711                 if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
 712                     out_c.write("\tjmethodID " + fn_line.group(2) + "_meth;\n")
 713             out_c.write("} " + struct_name + "_JCalls;\n")
 714
 715             out_java_trait.write("package org.ldk.structs;\n\n")
 716             out_java_trait.write("import org.ldk.impl.bindings;\n\n")
 717             out_java_trait.write("import org.ldk.enums.*;\n\n")
 718             out_java_trait.write("public class " + struct_name.replace("LDK","") + " extends CommonBase {\n")
 719             out_java_trait.write("\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); }\n")
 720             out_java_trait.write("\tpublic " + struct_name.replace("LDK", "") + "(bindings." + struct_name + " arg")
 721             for var_line in field_var_lines:
 722                 if var_line.group(1) in trait_structs:
 723                     out_java_trait.write(", bindings." + var_line.group(1) + " " + var_line.group(2))
 724             out_java_trait.write(") {\n")
 725             out_java_trait.write("\t\tsuper(bindings." + struct_name + "_new(arg")
 726             for var_line in field_var_lines:
 727                 if var_line.group(1) in trait_structs:
 728                     out_java_trait.write(", " + var_line.group(2))
 729             out_java_trait.write("));\n")
 730             out_java_trait.write("\t\tthis.ptrs_to.add(arg);\n")
 731             out_java_trait.write("\t}\n")
 732             out_java_trait.write("\t@Override @SuppressWarnings(\"deprecation\")\n")
 733             out_java_trait.write("\tprotected void finalize() throws Throwable {\n")
 734             out_java_trait.write("\t\tbindings." + struct_name.replace("LDK","") + "_free(ptr); super.finalize();\n")
 735             out_java_trait.write("\t}\n\n")
 736
 737             out_java.write("\tpublic interface " + struct_name + " {\n")
 738             java_meths = []
 739             for fn_line in trait_fn_lines:
 740                 java_meth_descr = "("
 741                 if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
 742                     ret_ty_info = java_c_types(fn_line.group(1), None)
 743
 744                     out_java.write("\t\t " + ret_ty_info.java_ty + " " + fn_line.group(2) + "(")
 745                     is_const = fn_line.group(3) is not None
 746                     out_c.write(fn_line.group(1) + fn_line.group(2) + "_jcall(")
 747                     if is_const:
 748                         out_c.write("const void* this_arg")
 749                     else:
 750                         out_c.write("void* this_arg")
 751
 752                     arg_names = []
 753                     for idx, arg in enumerate(fn_line.group(4).split(',')):
 754                         if arg == "":
 755                             continue
 756                         if idx >= 2:
 757                             out_java.write(", ")
 758                         out_c.write(", ")
 759                         arg_conv_info = map_type(arg, True, None, False)
 760                         out_c.write(arg.strip())
 761                         out_java.write(arg_conv_info.java_ty + " " + arg_conv_info.arg_name)
 762                         arg_names.append(arg_conv_info)
 763                         java_meth_descr = java_meth_descr + arg_conv_info.java_fn_ty_arg
 764                     java_meth_descr = java_meth_descr + ")" + ret_ty_info.java_fn_ty_arg
 765                     java_meths.append(java_meth_descr)
 766
 767                     out_java.write(");\n")
 768                     out_c.write(") {\n")
 769                     out_c.write("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
 770                     out_c.write("\tJNIEnv *env;\n")
 771                     out_c.write("\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_8) == JNI_OK);\n")
 772
 773                     for arg_info in arg_names:
 774                         if arg_info.ret_conv is not None:
 775                             out_c.write("\t" + arg_info.ret_conv[0].replace('\n', '\n\t').replace("_env", "env"));
 776                             out_c.write(arg_info.arg_name)
 777                             out_c.write(arg_info.ret_conv[1].replace('\n', '\n\t').replace("_env", "env") + "\n")
 778
 779                     out_c.write("\tjobject obj = (*env)->NewLocalRef(env, j_calls->o);\n\tCHECK(obj != NULL);\n")
 780                     if ret_ty_info.c_ty.endswith("Array"):
 781                         assert(ret_ty_info.c_ty == "jbyteArray")
 782                         out_c.write("\tjbyteArray jret = (*env)->CallObjectMethod(env, obj, j_calls->" + fn_line.group(2) + "_meth")
 783                     elif not ret_ty_info.passed_as_ptr:
 784                         out_c.write("\treturn (*env)->Call" + ret_ty_info.java_ty.title() + "Method(env, obj, j_calls->" + fn_line.group(2) + "_meth")
 785                     else:
 786                         out_c.write("\t" + fn_line.group(1).strip() + "* ret = (" + fn_line.group(1).strip() + "*)(*env)->CallLongMethod(env, obj, j_calls->" + fn_line.group(2) + "_meth");
 787
 788                     for arg_info in arg_names:
 789                         if arg_info.ret_conv is not None:
 790                             out_c.write(", " + arg_info.ret_conv_name)
 791                         else:
 792                             out_c.write(", " + arg_info.arg_name)
 793                     out_c.write(");\n");
 794                     if ret_ty_info.c_ty.endswith("Array"):
 795                         out_c.write("\t" + ret_ty_info.rust_obj + " ret;\n")
 796                         out_c.write("\tCHECK((*env)->GetArrayLength(env, jret) == " + ret_ty_info.arr_len + ");\n")
 797                         out_c.write("\t(*env)->GetByteArrayRegion(env, jret, 0, " + ret_ty_info.arr_len + ", ret." + ret_ty_info.arr_access + ");\n")
 798                         out_c.write("\treturn ret;\n")
 799
 800                     if ret_ty_info.passed_as_ptr:
 801                         out_c.write("\t" + fn_line.group(1).strip() + " res = *ret;\n")
 802                         out_c.write("\tFREE(ret);\n")
 803                         out_c.write("\treturn res;\n")
 804                     out_c.write("}\n")
 805                 elif fn_line.group(2) == "free":
 806                     out_c.write("static void " + struct_name + "_JCalls_free(void* this_arg) {\n")
 807                     out_c.write("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
 808                     out_c.write("\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n")
 809                     out_c.write("\t\tJNIEnv *env;\n")
 810                     out_c.write("\t\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_8) == JNI_OK);\n")
 811                     out_c.write("\t\t(*env)->DeleteWeakGlobalRef(env, j_calls->o);\n")
 812                     out_c.write("\t\tFREE(j_calls);\n")
 813                     out_c.write("\t}\n}\n")
 814
 815             # Write out a clone function whether we need one or not, as we use them in moving to rust
 816             out_c.write("static void* " + struct_name + "_JCalls_clone(const void* this_arg) {\n")
 817             out_c.write("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
 818             out_c.write("\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n")
 819             for var_line in field_var_lines:
 820                 if var_line.group(1) in trait_structs:
 821                     out_c.write("\tatomic_fetch_add_explicit(&j_calls->" + var_line.group(2) + "->refcnt, 1, memory_order_release);\n")
 822             out_c.write("\treturn (void*) this_arg;\n")
 823             out_c.write("}\n")
 824
 825             out_java.write("\t}\n")
 826
 827             out_java.write("\tpublic static native long " + struct_name + "_new(" + struct_name + " impl")
 828             out_c.write("static inline " + struct_name + " " + struct_name + "_init (JNIEnv * env, jclass _a, jobject o")
 829             for var_line in field_var_lines:
 830                 if var_line.group(1) in trait_structs:
 831                     out_java.write(", " + var_line.group(1) + " " + var_line.group(2))
 832                     out_c.write(", jobject " + var_line.group(2))
 833             out_java.write(");\n")
 834             out_c.write(") {\n")
 835
 836             out_c.write("\tjclass c = (*env)->GetObjectClass(env, o);\n")
 837             out_c.write("\tCHECK(c != NULL);\n")
 838             out_c.write("\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n")
 839             out_c.write("\tatomic_init(&calls->refcnt, 1);\n")
 840             out_c.write("\tDO_ASSERT((*env)->GetJavaVM(env, &calls->vm) == 0);\n")
 841             out_c.write("\tcalls->o = (*env)->NewWeakGlobalRef(env, o);\n")
 842             for (fn_line, java_meth_descr) in zip(trait_fn_lines, java_meths):
 843                 if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
 844                     out_c.write("\tcalls->" + fn_line.group(2) + "_meth = (*env)->GetMethodID(env, c, \"" + fn_line.group(2) + "\", \"" + java_meth_descr + "\");\n")
 845                     out_c.write("\tCHECK(calls->" + fn_line.group(2) + "_meth != NULL);\n")
 846             out_c.write("\n\t" + struct_name + " ret = {\n")
 847             out_c.write("\t\t.this_arg = (void*) calls,\n")
 848             for fn_line in trait_fn_lines:
 849                 if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
 850                     out_c.write("\t\t." + fn_line.group(2) + " = " + fn_line.group(2) + "_jcall,\n")
 851                 elif fn_line.group(2) == "free":
 852                     out_c.write("\t\t.free = " + struct_name + "_JCalls_free,\n")
 853                 else:
 854                     clone_fns.add(struct_name + "_clone")
 855                     out_c.write("\t\t.clone = " + struct_name + "_JCalls_clone,\n")
 856             for var_line in field_var_lines:
 857                 if var_line.group(1) in trait_structs:
 858                     out_c.write("\t\t." + var_line.group(2) + " = " + var_line.group(1) + "_init(env, _a, " + var_line.group(2) + "),\n")
 859             out_c.write("\t};\n")
 860             for var_line in field_var_lines:
 861                 if var_line.group(1) in trait_structs:
 862                     out_c.write("\tcalls->" + var_line.group(2) + " = ret." + var_line.group(2) + ".this_arg;\n")
 863             out_c.write("\treturn ret;\n")
 864             out_c.write("}\n")
 865
 866             out_c.write("JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1new (JNIEnv * env, jclass _a, jobject o")
 867             for var_line in field_var_lines:
 868                 if var_line.group(1) in trait_structs:
 869                     out_c.write(", jobject " + var_line.group(2))
 870             out_c.write(") {\n")
 871             out_c.write("\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n")
 872             out_c.write("\t*res_ptr = " + struct_name + "_init(env, _a, o")
 873             for var_line in field_var_lines:
 874                 if var_line.group(1) in trait_structs:
 875                     out_c.write(", " + var_line.group(2))
 876             out_c.write(");\n")
 877             out_c.write("\treturn (long)res_ptr;\n")
 878             out_c.write("}\n")
 879
 880             out_java.write("\tpublic static native " + struct_name + " " + struct_name + "_get_obj_from_jcalls(long val);\n")
 881             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")
 882             out_c.write("\tjobject ret = (*env)->NewLocalRef(env, ((" + struct_name + "_JCalls*)val)->o);\n")
 883             out_c.write("\tCHECK(ret != NULL);\n")
 884             out_c.write("\treturn ret;\n")
 885             out_c.write("}\n")
 886
 887         for fn_line in trait_fn_lines:
 888             # For now, just disable enabling the _call_log - we don't know how to inverse-map String
 889             is_log = fn_line.group(2) == "log" and struct_name == "LDKLogger"
 890             if fn_line.group(2) != "free" and fn_line.group(2) != "clone" and fn_line.group(2) != "eq" and not is_log:
 891                 dummy_line = fn_line.group(1) + struct_name.replace("LDK", "") + "_" + fn_line.group(2) + " " + struct_name + "* this_arg" + fn_line.group(4) + "\n"
 892                 map_fn(dummy_line, re.compile("([A-Za-z_0-9]*) *([A-Za-z_0-9]*) *(.*)").match(dummy_line), None, "(this_arg_conv->" + fn_line.group(2) + ")(this_arg_conv->this_arg")
 893
 894     out_c.write("""#include \"org_ldk_impl_bindings.h\"
 895 #include <rust_types.h>
 896 #include <lightning.h>
 897 #include <string.h>
 898 #include <stdatomic.h>
 899 """)
 900
 901     if sys.argv[4] == "false":
 902         out_c.write("#define MALLOC(a, _) malloc(a)\n")
 903         out_c.write("#define FREE free\n")
 904         out_c.write("#define DO_ASSERT(a) (void)(a)\n")
 905         out_c.write("#define CHECK(a)\n")
 906     else:
 907         out_c.write("""#include <assert.h>
 908 // Always run a, then assert it is true:
 909 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
 910 // Assert a is true or do nothing
 911 #define CHECK(a) DO_ASSERT(a)
 912
 913 // Running a leak check across all the allocations and frees of the JDK is a mess,
 914 // so instead we implement our own naive leak checker here, relying on the -wrap
 915 // linker option to wrap malloc/calloc/realloc/free, tracking everyhing allocated
 916 // and free'd in Rust or C across the generated bindings shared library.
 917 #include <threads.h>
 918 #include <execinfo.h>
 919 #include <unistd.h>
 920 static mtx_t allocation_mtx;
 921
 922 void __attribute__((constructor)) init_mtx() {
 923         DO_ASSERT(mtx_init(&allocation_mtx, mtx_plain) == thrd_success);
 924 }
 925
 926 #define BT_MAX 128
 927 typedef struct allocation {
 928         struct allocation* next;
 929         void* ptr;
 930         const char* struct_name;
 931         void* bt[BT_MAX];
 932         int bt_len;
 933 } allocation;
 934 static allocation* allocation_ll = NULL;
 935
 936 void* __real_malloc(size_t len);
 937 void* __real_calloc(size_t nmemb, size_t len);
 938 static void new_allocation(void* res, const char* struct_name) {
 939         allocation* new_alloc = __real_malloc(sizeof(allocation));
 940         new_alloc->ptr = res;
 941         new_alloc->struct_name = struct_name;
 942         new_alloc->bt_len = backtrace(new_alloc->bt, BT_MAX);
 943         DO_ASSERT(mtx_lock(&allocation_mtx) == thrd_success);
 944         new_alloc->next = allocation_ll;
 945         allocation_ll = new_alloc;
 946         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
 947 }
 948 static void* MALLOC(size_t len, const char* struct_name) {
 949         void* res = __real_malloc(len);
 950         new_allocation(res, struct_name);
 951         return res;
 952 }
 953 void __real_free(void* ptr);
 954 static void alloc_freed(void* ptr) {
 955         allocation* p = NULL;
 956         DO_ASSERT(mtx_lock(&allocation_mtx) == thrd_success);
 957         allocation* it = allocation_ll;
 958         while (it->ptr != ptr) { p = it; it = it->next; }
 959         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
 960         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
 961         DO_ASSERT(it->ptr == ptr);
 962         __real_free(it);
 963 }
 964 static void FREE(void* ptr) {
 965         alloc_freed(ptr);
 966         __real_free(ptr);
 967 }
 968
 969 void* __wrap_malloc(size_t len) {
 970         void* res = __real_malloc(len);
 971         new_allocation(res, "malloc call");
 972         return res;
 973 }
 974 void* __wrap_calloc(size_t nmemb, size_t len) {
 975         void* res = __real_calloc(nmemb, len);
 976         new_allocation(res, "calloc call");
 977         return res;
 978 }
 979 void __wrap_free(void* ptr) {
 980         alloc_freed(ptr);
 981         __real_free(ptr);
 982 }
 983
 984 void* __real_realloc(void* ptr, size_t newlen);
 985 void* __wrap_realloc(void* ptr, size_t len) {
 986         alloc_freed(ptr);
 987         void* res = __real_realloc(ptr, len);
 988         new_allocation(res, "realloc call");
 989         return res;
 990 }
 991 void __wrap_reallocarray(void* ptr, size_t new_sz) {
 992         // Rust doesn't seem to use reallocarray currently
 993         assert(false);
 994 }
 995
 996 void __attribute__((destructor)) check_leaks() {
 997         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 998                 fprintf(stderr, "%s %p remains:\\n", a->struct_name, a->ptr);
 999                 backtrace_symbols_fd(a->bt, a->bt_len, STDERR_FILENO);
1000                 fprintf(stderr, "\\n\\n");
1001         }
1002         DO_ASSERT(allocation_ll == NULL);
1003 }
1004 """)
1005     out_java.write("""package org.ldk.impl;
1006 import org.ldk.enums.*;
1007
1008 public class bindings {
1009         public static class VecOrSliceDef {
1010                 public long dataptr;
1011                 public long datalen;
1012                 public long stride;
1013                 public VecOrSliceDef(long dataptr, long datalen, long stride) {
1014                         this.dataptr = dataptr; this.datalen = datalen; this.stride = stride;
1015                 }
1016         }
1017         static {
1018                 System.loadLibrary(\"lightningjni\");
1019                 init(java.lang.Enum.class, VecOrSliceDef.class);
1020         }
1021         static native void init(java.lang.Class c, java.lang.Class slicedef);
1022
1023         public static native boolean deref_bool(long ptr);
1024         public static native long deref_long(long ptr);
1025         public static native void free_heap_ptr(long ptr);
1026         public static native byte[] read_bytes(long ptr, long len);
1027         public static native byte[] get_u8_slice_bytes(long slice_ptr);
1028         public static native long bytes_to_u8_vec(byte[] bytes);
1029         public static native long new_txpointer_copy_data(byte[] txdata);
1030         public static native long vec_slice_len(long vec);
1031         public static native long new_empty_slice_vec();
1032
1033 """)
1034     out_c.write("""
1035 static jmethodID ordinal_meth = NULL;
1036 static jmethodID slicedef_meth = NULL;
1037 static jclass slicedef_cls = NULL;
1038 JNIEXPORT void Java_org_ldk_impl_bindings_init(JNIEnv * env, jclass _b, jclass enum_class, jclass slicedef_class) {
1039         ordinal_meth = (*env)->GetMethodID(env, enum_class, "ordinal", "()I");
1040         CHECK(ordinal_meth != NULL);
1041         slicedef_meth = (*env)->GetMethodID(env, slicedef_class, "<init>", "(JJJ)V");
1042         CHECK(slicedef_meth != NULL);
1043         slicedef_cls = (*env)->NewGlobalRef(env, slicedef_class);
1044         CHECK(slicedef_cls != NULL);
1045 }
1046
1047 JNIEXPORT jboolean JNICALL Java_org_ldk_impl_bindings_deref_1bool (JNIEnv * env, jclass _a, jlong ptr) {
1048         return *((bool*)ptr);
1049 }
1050 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_deref_1long (JNIEnv * env, jclass _a, jlong ptr) {
1051         return *((long*)ptr);
1052 }
1053 JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_free_1heap_1ptr (JNIEnv * env, jclass _a, jlong ptr) {
1054         FREE((void*)ptr);
1055 }
1056 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_read_1bytes (JNIEnv * _env, jclass _b, jlong ptr, jlong len) {
1057         jbyteArray ret_arr = (*_env)->NewByteArray(_env, len);
1058         (*_env)->SetByteArrayRegion(_env, ret_arr, 0, len, (unsigned char*)ptr);
1059         return ret_arr;
1060 }
1061 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_get_1u8_1slice_1bytes (JNIEnv * _env, jclass _b, jlong slice_ptr) {
1062         LDKu8slice *slice = (LDKu8slice*)slice_ptr;
1063         jbyteArray ret_arr = (*_env)->NewByteArray(_env, slice->datalen);
1064         (*_env)->SetByteArrayRegion(_env, ret_arr, 0, slice->datalen, slice->data);
1065         return ret_arr;
1066 }
1067 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_bytes_1to_1u8_1vec (JNIEnv * _env, jclass _b, jbyteArray bytes) {
1068         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "LDKCVec_u8");
1069         vec->datalen = (*_env)->GetArrayLength(_env, bytes);
1070         vec->data = (uint8_t*)MALLOC(vec->datalen, "LDKCVec_u8Z Bytes");
1071         (*_env)->GetByteArrayRegion (_env, bytes, 0, vec->datalen, vec->data);
1072         return (long)vec;
1073 }
1074 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_new_1txpointer_1copy_1data (JNIEnv * env, jclass _b, jbyteArray bytes) {
1075         LDKTransaction *txdata = (LDKTransaction*)MALLOC(sizeof(LDKTransaction), "LDKTransaction");
1076         txdata->datalen = (*env)->GetArrayLength(env, bytes);
1077         txdata->data = (uint8_t*)MALLOC(txdata->datalen, "Tx Data Bytes");
1078         txdata->data_is_owned = true;
1079         (*env)->GetByteArrayRegion (env, bytes, 0, txdata->datalen, txdata->data);
1080         return (long)txdata;
1081 }
1082 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_vec_1slice_1len (JNIEnv * env, jclass _a, jlong ptr) {
1083         // Check offsets of a few Vec types are all consistent as we're meant to be generic across types
1084         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_SignatureZ, datalen), "Vec<*> needs to be mapped identically");
1085         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_MessageSendEventZ, datalen), "Vec<*> needs to be mapped identically");
1086         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_EventZ, datalen), "Vec<*> needs to be mapped identically");
1087         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_C2Tuple_usizeTransactionZZ, datalen), "Vec<*> needs to be mapped identically");
1088         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)ptr;
1089         return (long)vec->datalen;
1090 }
1091 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_new_1empty_1slice_1vec (JNIEnv * _env, jclass _b) {
1092         // Check sizes of a few Vec types are all consistent as we're meant to be generic across types
1093         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_SignatureZ), "Vec<*> needs to be mapped identically");
1094         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_MessageSendEventZ), "Vec<*> needs to be mapped identically");
1095         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_EventZ), "Vec<*> needs to be mapped identically");
1096         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_C2Tuple_usizeTransactionZZ), "Vec<*> needs to be mapped identically");
1097         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "Empty LDKCVec");
1098         vec->data = NULL;
1099         vec->datalen = 0;
1100         return (long)vec;
1101 }
1102
1103 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
1104 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
1105 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
1106 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
1107
1108 """)
1109
1110     with open(sys.argv[3] + "/structs/CommonBase.java", "a") as out_java_struct:
1111         out_java_struct.write("""package org.ldk.structs;
1112 import java.util.LinkedList;
1113 class CommonBase {
1114         final long ptr;
1115         LinkedList<Object> ptrs_to = new LinkedList();
1116         protected CommonBase(long ptr) { this.ptr = ptr; }
1117         public long _test_only_get_ptr() { return this.ptr; }
1118 }
1119 """)
1120
1121     in_block_comment = False
1122     cur_block_obj = None
1123
1124     const_val_regex = re.compile("^extern const ([A-Za-z_0-9]*) ([A-Za-z_0-9]*);$")
1125
1126     line_indicates_result_regex = re.compile("^   (LDKCResultPtr_[A-Za-z_0-9]*) contents;$")
1127     line_indicates_vec_regex = re.compile("^   ([A-Za-z_0-9]*) \*data;$")
1128     line_indicates_opaque_regex = re.compile("^   bool is_owned;$")
1129     line_indicates_trait_regex = re.compile("^   ([A-Za-z_0-9]* \*?)\(\*([A-Za-z_0-9]*)\)\((const )?void \*this_arg(.*)\);$")
1130     assert(line_indicates_trait_regex.match("   uintptr_t (*send_data)(void *this_arg, LDKu8slice data, bool resume_read);"))
1131     assert(line_indicates_trait_regex.match("   LDKCVec_MessageSendEventZ (*get_and_clear_pending_msg_events)(const void *this_arg);"))
1132     assert(line_indicates_trait_regex.match("   void *(*clone)(const void *this_arg);"))
1133     line_field_var_regex = re.compile("^   ([A-Za-z_0-9]*) ([A-Za-z_0-9]*);$")
1134     assert(line_field_var_regex.match("   LDKMessageSendEventsProvider MessageSendEventsProvider;"))
1135     struct_name_regex = re.compile("^typedef (struct|enum|union) (MUST_USE_STRUCT )?(LDK[A-Za-z_0-9]*) {$")
1136     assert(struct_name_regex.match("typedef struct LDKCVecTempl_u8 {"))
1137     assert(struct_name_regex.match("typedef enum LDKNetwork {"))
1138     struct_alias_regex = re.compile("^typedef (LDK[A-Za-z_0-9]*) (LDK[A-Za-z_0-9]*);$")
1139     assert(struct_alias_regex.match("typedef LDKCResultTempl_bool__PeerHandleError LDKCResult_boolPeerHandleErrorZ;"))
1140
1141     result_templ_structs = set()
1142     union_enum_items = {}
1143     result_ptr_struct_items = {}
1144     for line in in_h:
1145         if in_block_comment:
1146             if line.endswith("*/\n"):
1147                 in_block_comment = False
1148         elif cur_block_obj is not None:
1149             cur_block_obj  = cur_block_obj + line
1150             if line.startswith("} "):
1151                 field_lines = []
1152                 struct_name = None
1153                 vec_ty = None
1154                 obj_lines = cur_block_obj.split("\n")
1155                 is_opaque = False
1156                 result_contents = None
1157                 is_unitary_enum = False
1158                 is_union_enum = False
1159                 is_union = False
1160                 is_tuple = False
1161                 trait_fn_lines = []
1162                 field_var_lines = []
1163
1164                 for idx, struct_line in enumerate(obj_lines):
1165                     if struct_line.strip().startswith("/*"):
1166                         in_block_comment = True
1167                     if in_block_comment:
1168                         if struct_line.endswith("*/"):
1169                             in_block_comment = False
1170                     else:
1171                         struct_name_match = struct_name_regex.match(struct_line)
1172                         if struct_name_match is not None:
1173                             struct_name = struct_name_match.group(3)
1174                             if struct_name_match.group(1) == "enum":
1175                                 if not struct_name.endswith("_Tag"):
1176                                     is_unitary_enum = True
1177                                 else:
1178                                     is_union_enum = True
1179                             elif struct_name_match.group(1) == "union":
1180                                 is_union = True
1181                         if line_indicates_opaque_regex.match(struct_line):
1182                             is_opaque = True
1183                         result_match = line_indicates_result_regex.match(struct_line)
1184                         if result_match is not None:
1185                             result_contents = result_match.group(1)
1186                         vec_ty_match = line_indicates_vec_regex.match(struct_line)
1187                         if vec_ty_match is not None and struct_name.startswith("LDKCVecTempl_"):
1188                             vec_ty = vec_ty_match.group(1)
1189                         elif struct_name.startswith("LDKC2TupleTempl_") or struct_name.startswith("LDKC3TupleTempl_"):
1190                             is_tuple = True
1191                         trait_fn_match = line_indicates_trait_regex.match(struct_line)
1192                         if trait_fn_match is not None:
1193                             trait_fn_lines.append(trait_fn_match)
1194                         field_var_match = line_field_var_regex.match(struct_line)
1195                         if field_var_match is not None:
1196                             field_var_lines.append(field_var_match)
1197                         field_lines.append(struct_line)
1198
1199                 assert(struct_name is not None)
1200                 assert(len(trait_fn_lines) == 0 or not (is_opaque or is_unitary_enum or is_union_enum or is_union or result_contents is not None or vec_ty is not None))
1201                 assert(not is_opaque or not (len(trait_fn_lines) != 0 or is_unitary_enum or is_union_enum or is_union or result_contents is not None or vec_ty is not None))
1202                 assert(not is_unitary_enum or not (len(trait_fn_lines) != 0 or is_opaque or is_union_enum or is_union or result_contents is not None or vec_ty is not None))
1203                 assert(not is_union_enum or not (len(trait_fn_lines) != 0 or is_unitary_enum or is_opaque or is_union or result_contents is not None or vec_ty is not None))
1204                 assert(not is_union or not (len(trait_fn_lines) != 0 or is_unitary_enum or is_union_enum or is_opaque or result_contents is not None or vec_ty is not None))
1205                 assert(result_contents is None or not (len(trait_fn_lines) != 0 or is_unitary_enum or is_union_enum or is_opaque or is_union or vec_ty is not None))
1206                 assert(vec_ty is None or not (len(trait_fn_lines) != 0 or is_unitary_enum or is_union_enum or is_opaque or is_union or result_contents is not None))
1207
1208                 if is_opaque:
1209                     opaque_structs.add(struct_name)
1210                     with open(sys.argv[3] + "/structs/" + struct_name.replace("LDK","") + ".java", "w") as out_java_struct:
1211                         out_java_struct.write("package org.ldk.structs;\n\n")
1212                         out_java_struct.write("import org.ldk.impl.bindings;\n")
1213                         out_java_struct.write("import org.ldk.enums.*;\n\n")
1214                         out_java_struct.write("public class " + struct_name.replace("LDK","") + " extends CommonBase {\n")
1215                         out_java_struct.write("\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); }\n")
1216                         out_java_struct.write("\t@Override @SuppressWarnings(\"deprecation\")\n")
1217                         out_java_struct.write("\tprotected void finalize() throws Throwable {\n")
1218                         out_java_struct.write("\t\tbindings." + struct_name.replace("LDK","") + "_free(ptr); super.finalize();\n")
1219                         out_java_struct.write("\t}\n\n")
1220                 elif result_contents is not None:
1221                     result_templ_structs.add(struct_name)
1222                     assert result_contents in result_ptr_struct_items
1223                 elif struct_name.startswith("LDKCResultPtr_"):
1224                     for line in field_lines:
1225                         if line.endswith("*result;"):
1226                             res_ty = line[:-8].strip()
1227                         elif line.endswith("*err;"):
1228                             err_ty = line[:-5].strip()
1229                     result_ptr_struct_items[struct_name] = (res_ty, err_ty)
1230                 elif is_tuple:
1231                     out_java.write("\tpublic static native long " + struct_name + "_new(")
1232                     out_c.write("JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1new(JNIEnv *_env, jclass _b")
1233                     for idx, line in enumerate(field_lines):
1234                         if idx != 0 and idx < len(field_lines) - 2:
1235                             ty_info = java_c_types(line.strip(';'), None)
1236                             if idx != 1:
1237                                 out_java.write(", ")
1238                             e = chr(ord('a') + idx - 1)
1239                             out_java.write(ty_info.java_ty + " " + e)
1240                             out_c.write(", " + ty_info.c_ty + " " + e)
1241                     out_java.write(");\n")
1242                     out_c.write(") {\n")
1243                     out_c.write("\t" + struct_name + "* ret = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n")
1244                     for idx, line in enumerate(field_lines):
1245                         if idx != 0 and idx < len(field_lines) - 2:
1246                             ty_info = map_type(line.strip(';'), False, None, False)
1247                             e = chr(ord('a') + idx - 1)
1248                             if ty_info.arg_conv is not None:
1249                                 out_c.write("\t" + ty_info.arg_conv.replace("\n", "\n\t"))
1250                                 out_c.write("\n\tret->" + e + " = " + ty_info.arg_conv_name + ";\n")
1251                             else:
1252                                 out_c.write("\tret->" + e + " = " + e + ";\n")
1253                             assert ty_info.arg_conv_cleanup is None
1254                     out_c.write("\treturn (long)ret;\n")
1255                     out_c.write("}\n")
1256                 elif vec_ty is not None:
1257                     if vec_ty in opaque_structs:
1258                         out_java.write("\tpublic static native long[] " + struct_name + "_arr_info(long vec_ptr);\n")
1259                         out_c.write("JNIEXPORT jlongArray JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1arr_1info(JNIEnv *env, jclass _b, jlong ptr) {\n")
1260                     else:
1261                         out_java.write("\tpublic static native VecOrSliceDef " + struct_name + "_arr_info(long vec_ptr);\n")
1262                         out_c.write("JNIEXPORT jobject JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1arr_1info(JNIEnv *env, jclass _b, jlong ptr) {\n")
1263                     out_c.write("\t" + struct_name + " *vec = (" + struct_name + "*)ptr;\n")
1264                     if vec_ty in opaque_structs:
1265                         out_c.write("\tjlongArray ret = (*env)->NewLongArray(env, vec->datalen);\n")
1266                         out_c.write("\tjlong *ret_elems = (*env)->GetPrimitiveArrayCritical(env, ret, NULL);\n")
1267                         out_c.write("\tfor (size_t i = 0; i < vec->datalen; i++) {\n")
1268                         out_c.write("\t\tCHECK((((long)vec->data[i].inner) & 1) == 0);\n")
1269                         out_c.write("\t\tret_elems[i] = (long)vec->data[i].inner | (vec->data[i].is_owned ? 1 : 0);\n")
1270                         out_c.write("\t}\n")
1271                         out_c.write("\t(*env)->ReleasePrimitiveArrayCritical(env, ret, ret_elems, 0);\n")
1272                         out_c.write("\treturn ret;\n")
1273                     else:
1274                         out_c.write("\treturn (*env)->NewObject(env, slicedef_cls, slicedef_meth, (long)vec->data, (long)vec->datalen, sizeof(" + vec_ty + "));\n")
1275                     out_c.write("}\n")
1276
1277                     ty_info = map_type(vec_ty + " arr_elem", False, None, False)
1278                     if len(ty_info.java_fn_ty_arg) == 1: # ie we're a primitive of some form
1279                         out_java.write("\tpublic static native long " + struct_name + "_new(" + ty_info.java_ty + "[] elems);\n")
1280                         out_c.write("JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1new(JNIEnv *env, jclass _b, j" + ty_info.java_ty + "Array elems){\n")
1281                         out_c.write("\t" + struct_name + " *ret = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n")
1282                         out_c.write("\tret->datalen = (*env)->GetArrayLength(env, elems);\n")
1283                         out_c.write("\tif (ret->datalen == 0) {\n")
1284                         out_c.write("\t\tret->data = NULL;\n")
1285                         out_c.write("\t} else {\n")
1286                         out_c.write("\t\tret->data = MALLOC(sizeof(" + vec_ty + ") * ret->datalen, \"" + struct_name + " Data\");\n")
1287                         out_c.write("\t\t" + ty_info.c_ty + " *java_elems = (*env)->GetPrimitiveArrayCritical(env, elems, NULL);\n")
1288                         out_c.write("\t\tfor (size_t i = 0; i < ret->datalen; i++) {\n")
1289                         if ty_info.arg_conv is not None:
1290                             out_c.write("\t\t\t" + ty_info.c_ty + " arr_elem = java_elems[i];\n")
1291                             out_c.write("\t\t\t" + ty_info.arg_conv.replace("\n", "\n\t\t\t") + "\n")
1292                             out_c.write("\t\t\tret->data[i] = " + ty_info.arg_conv_name + ";\n")
1293                             assert ty_info.arg_conv_cleanup is None
1294                         else:
1295                             out_c.write("\t\t\tret->data[i] = java_elems[i];\n")
1296                         out_c.write("\t\t}\n")
1297                         out_c.write("\t\t(*env)->ReleasePrimitiveArrayCritical(env, elems, java_elems, 0);\n")
1298                         out_c.write("\t}\n")
1299                         out_c.write("\treturn (long)ret;\n")
1300                         out_c.write("}\n")
1301                 elif is_union_enum:
1302                     assert(struct_name.endswith("_Tag"))
1303                     struct_name = struct_name[:-4]
1304                     union_enum_items[struct_name] = {"field_lines": field_lines}
1305                 elif struct_name.endswith("_Body") and struct_name.split("_")[0] in union_enum_items:
1306                     enum_var_name = struct_name.split("_")
1307                     union_enum_items[enum_var_name[0]][enum_var_name[1]] = field_lines
1308                 elif struct_name in union_enum_items:
1309                     map_complex_enum(struct_name, union_enum_items[struct_name])
1310                 elif is_unitary_enum:
1311                     map_unitary_enum(struct_name, field_lines)
1312                 elif len(trait_fn_lines) > 0:
1313                     trait_structs.add(struct_name)
1314                     map_trait(struct_name, field_var_lines, trait_fn_lines)
1315                 cur_block_obj = None
1316         else:
1317             fn_ptr = fn_ptr_regex.match(line)
1318             fn_ret_arr = fn_ret_arr_regex.match(line)
1319             reg_fn = reg_fn_regex.match(line)
1320             const_val = const_val_regex.match(line)
1321
1322             if line.startswith("#include <"):
1323                 pass
1324             elif line.startswith("/*"):
1325                 #out_java.write("\t" + line)
1326                 if not line.endswith("*/\n"):
1327                     in_block_comment = True
1328             elif line.startswith("typedef enum "):
1329                 cur_block_obj = line
1330             elif line.startswith("typedef struct "):
1331                 cur_block_obj = line
1332             elif line.startswith("typedef union "):
1333                 cur_block_obj = line
1334             elif line.startswith("typedef "):
1335                 alias_match =  struct_alias_regex.match(line)
1336                 if alias_match.group(1) in result_templ_structs:
1337                     out_java.write("\tpublic static native boolean " + alias_match.group(2) + "_result_ok(long arg);\n")
1338                     out_java.write("\tpublic static native long " + alias_match.group(2) + "_get_inner(long arg);\n")
1339                     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")
1340                     out_c.write("\treturn ((" + alias_match.group(2) + "*)arg)->result_ok;\n")
1341                     out_c.write("}\n")
1342                     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")
1343                     contents_ty = alias_match.group(1).replace("LDKCResultTempl", "LDKCResultPtr")
1344                     res_ty, err_ty = result_ptr_struct_items[contents_ty]
1345                     out_c.write("\t" + alias_match.group(2) + " *val = (" + alias_match.group(2) + "*)arg;\n")
1346                     out_c.write("\tif (val->result_ok) {\n")
1347                     if res_ty not in opaque_structs:
1348                         out_c.write("\t\treturn (long)val->contents.result;\n")
1349                     else:
1350                         out_c.write("\t\treturn (long)(val->contents.result->inner) | (val->contents.result->is_owned ? 1 : 0);\n")
1351                     out_c.write("\t} else {\n")
1352                     if err_ty not in opaque_structs:
1353                         out_c.write("\t\treturn (long)val->contents.err;\n")
1354                     else:
1355                         out_c.write("\t\treturn (long)(val->contents.err->inner) | (val->contents.err->is_owned ? 1 : 0);\n")
1356                     out_c.write("\t}\n}\n")
1357                 pass
1358             elif fn_ptr is not None:
1359                 map_fn(line, fn_ptr, None, None)
1360             elif fn_ret_arr is not None:
1361                 map_fn(line, fn_ret_arr, fn_ret_arr.group(4), None)
1362             elif reg_fn is not None:
1363                 map_fn(line, reg_fn, None, None)
1364             elif const_val_regex is not None:
1365                 # TODO Map const variables
1366                 pass
1367             else:
1368                 assert(line == "\n")
1369
1370     out_java.write("}\n")
1371     for struct_name in opaque_structs:
1372         with open(sys.argv[3] + "/structs/" + struct_name.replace("LDK","") + ".java", "a") as out_java_struct:
1373             out_java_struct.write("}\n")
1374     for struct_name in trait_structs:
1375         with open(sys.argv[3] + "/structs/" + struct_name.replace("LDK","") + ".java", "a") as out_java_struct:
1376             out_java_struct.write("}\n")