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

   1 from bindingstypes import ConvInfo
   2
   3 class TypeMappingGenerator:
   4
   5     def __init__(self, java_c_types, consts, opaque_structs, clone_fns, unitary_enums, trait_structs, complex_enums, result_types, tuple_types):
   6         # trick our way around circular imports
   7         self.java_c_types = java_c_types
   8         self.consts = consts
   9         self.opaque_structs = opaque_structs
  10         self.clone_fns = clone_fns
  11         self.unitary_enums = unitary_enums
  12         self.trait_structs = trait_structs
  13         self.complex_enums = complex_enums
  14         self.result_types = result_types
  15         self.tuple_types = tuple_types
  16
  17     def map_type(self, fn_arg, print_void, ret_arr_len, is_free, holds_ref):
  18         ty_info = self.java_c_types(fn_arg, ret_arr_len)
  19         mapped_info = self.map_type_with_info(ty_info, print_void, ret_arr_len, is_free, holds_ref, False)
  20         return mapped_info
  21
  22     def map_nullable_type(self, fn_arg, print_void, ret_arr_len, is_free, holds_ref):
  23         ty_info = self.java_c_types(fn_arg, ret_arr_len)
  24         mapped_info = self.map_type_with_info(ty_info, print_void, ret_arr_len, is_free, holds_ref, True)
  25         return mapped_info
  26
  27     def map_type_with_info(self, ty_info, print_void, ret_arr_len, is_free, holds_ref, is_nullable):
  28         mapped_info = self._do_map_type_with_info(ty_info, print_void, ret_arr_len, is_free, holds_ref, is_nullable)
  29         if is_nullable:
  30             mapped_info.nullable = True
  31         return mapped_info
  32
  33     def _do_map_type_with_info(self, ty_info, print_void, ret_arr_len, is_free, holds_ref, is_nullable):
  34         if ty_info.c_ty == "void":
  35             if not print_void:
  36                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
  37                     arg_conv = None, arg_conv_name = None, arg_conv_cleanup = None,
  38                     ret_conv = None, ret_conv_name = None, to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
  39         if ty_info.c_ty.endswith("Array"):
  40             arr_len = ty_info.arr_len
  41             if arr_len is not None:
  42                 arr_name = ty_info.var_name
  43             else:
  44                 arr_name = "ret"
  45                 arr_len = ret_arr_len
  46             if ty_info.c_ty == "int8_tArray":
  47                 (set_pfx, set_sfx) = self.consts.set_native_arr_contents(arr_name + "_arr", arr_len, ty_info)
  48                 ret_conv = ("int8_tArray " + arr_name + "_arr = " + self.consts.create_native_arr_call(arr_len, ty_info) + ";\n" + set_pfx, "")
  49                 arg_conv_cleanup = None
  50                 if not arr_len.isdigit():
  51                     arg_conv = ty_info.rust_obj + " " + arr_name + "_ref;\n"
  52                     arg_conv = arg_conv + arr_name + "_ref." + arr_len + " = " +  self.consts.get_native_arr_len_call[0] + arr_name + self.consts.get_native_arr_len_call[1] + ";\n"
  53                     if (not ty_info.is_ptr or not holds_ref) and ty_info.rust_obj != "LDKu8slice":
  54                         arg_conv = arg_conv + arr_name + "_ref." + ty_info.arr_access + " = MALLOC(" + arr_name + "_ref." + arr_len + ", \"" + ty_info.rust_obj + " Bytes\");\n"
  55                         arg_conv = arg_conv + self.consts.get_native_arr_contents(arr_name, arr_name + "_ref." + ty_info.arr_access, arr_name + "_ref." + arr_len, ty_info, True) + ";"
  56                     else:
  57                         arg_conv = arg_conv + arr_name + "_ref." + ty_info.arr_access + " = " + self.consts.get_native_arr_contents(arr_name, "NO_DEST", arr_name + "_ref." + arr_len, ty_info, False) + ";"
  58                         arg_conv_cleanup = self.consts.cleanup_native_arr_ref_contents(arr_name, arr_name + "_ref." + ty_info.arr_access, arr_name + "_ref." + arr_len, ty_info)
  59                     if ty_info.rust_obj == "LDKTransaction":
  60                         arg_conv = arg_conv + "\n" + arr_name + "_ref.data_is_owned = " + str(holds_ref).lower() + ";"
  61                     ret_conv = (ty_info.rust_obj + " " + arr_name + "_var = ", "")
  62                     ret_conv = (ret_conv[0], ";\nint8_tArray " + arr_name + "_arr = " + self.consts.create_native_arr_call(arr_name + "_var." + arr_len, ty_info) + ";\n")
  63                     (pfx, sfx) = self.consts.set_native_arr_contents(arr_name + "_arr", arr_name + "_var." + arr_len, ty_info)
  64                     ret_conv = (ret_conv[0], ret_conv[1] + pfx + arr_name + "_var." + ty_info.arr_access + sfx + ";")
  65                     if not holds_ref and ty_info.rust_obj != "LDKu8slice":
  66                         ret_conv = (ret_conv[0], ret_conv[1] + "\n" + ty_info.rust_obj.replace("LDK", "") + "_free(" + arr_name + "_var);")
  67                     from_hu_conv = self.consts.primitive_arr_from_hu(ty_info.subty, None, arr_name)
  68                     to_hu_conv = self.consts.primitive_arr_to_hu(ty_info.subty, None, arr_name, arr_name + "_conv")
  69                 elif ty_info.rust_obj is not None:
  70                     arg_conv = ty_info.rust_obj + " " + arr_name + "_ref;\n"
  71                     arg_conv = arg_conv + "CHECK(" + self.consts.get_native_arr_len_call[0] + arr_name + self.consts.get_native_arr_len_call[1] + " == " + arr_len + ");\n"
  72                     arg_conv = arg_conv + self.consts.get_native_arr_contents(arr_name, arr_name + "_ref." + ty_info.arr_access, arr_len, ty_info, True) + ";"
  73                     ret_conv = (ret_conv[0], "." + ty_info.arr_access + set_sfx + ";")
  74                     from_hu_conv = self.consts.primitive_arr_from_hu(ty_info.subty, arr_len, arr_name)
  75                     to_hu_conv = self.consts.primitive_arr_to_hu(ty_info.subty, None, arr_name, arr_name + "_conv")
  76                 else:
  77                     arg_conv = "unsigned char " + arr_name + "_arr[" + arr_len + "];\n"
  78                     arg_conv = arg_conv + "CHECK(" + self.consts.get_native_arr_len_call[0] + arr_name + self.consts.get_native_arr_len_call[1] + " == " + arr_len + ");\n"
  79                     arg_conv = arg_conv + self.consts.get_native_arr_contents(arr_name, arr_name + "_arr", arr_len, ty_info, True) + ";\n"
  80                     arg_conv = arg_conv + "unsigned char (*" + arr_name + "_ref)[" + arr_len + "] = &" + arr_name + "_arr;"
  81                     ret_conv = (ret_conv[0] + "*", set_sfx + ";")
  82                     from_hu_conv = self.consts.primitive_arr_from_hu(ty_info.subty, arr_len, arr_name)
  83                     to_hu_conv = self.consts.primitive_arr_to_hu(ty_info.subty, None, arr_name, arr_name + "_conv")
  84                 to_hu_conv_name = None
  85                 if to_hu_conv is not None:
  86                     to_hu_conv_name = arr_name + "_conv"
  87                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
  88                     arg_conv = arg_conv, arg_conv_name = arr_name + "_ref", arg_conv_cleanup = arg_conv_cleanup,
  89                     ret_conv = ret_conv, ret_conv_name = arr_name + "_arr",
  90                     to_hu_conv = to_hu_conv, to_hu_conv_name = to_hu_conv_name,
  91                     from_hu_conv = from_hu_conv)
  92             else:
  93                 assert not arr_len.isdigit() # fixed length arrays not implemented
  94                 assert ty_info.java_hu_ty[len(ty_info.java_hu_ty) - 2:] == "[]"
  95                 if arr_name == "":
  96                     arr_name = "ret"
  97                 conv_name = arr_name + "_conv_" + str(len(ty_info.java_hu_ty))
  98                 idxc = chr(ord('a') + (len(ty_info.java_hu_ty) % 26))
  99                 ty_info.subty.var_name = conv_name
 100                 #XXX: We'd really prefer to only ever set to False, avoiding lots of clone, but need smarter free logic
 101                 #if ty_info.is_ptr or holds_ref:
 102                 #    ty_info.subty.requires_clone = False
 103                 ty_info.subty.requires_clone = not ty_info.is_ptr or not holds_ref
 104                 if not ty_info.subty.is_native_primitive and ty_info.subty.rust_obj == "LDKChannelMonitor":
 105                     # We take a Vec of references to ChannelMonitors as input to ChannelManagerReadArgs, if we clone them,
 106                     # we end up freeing the clones after creating the ChannelManagerReadArgs before calling the read
 107                     # function itself, resulting in a segfault. Thus, we manually check and ensure we don't clone for
 108                     # ChannelMonitors inside of vecs.
 109                     ty_info.subty.requires_clone = False
 110                 subty = self.map_type_with_info(ty_info.subty, False, None, is_free, holds_ref, False)
 111                 arg_conv = ty_info.rust_obj + " " + arr_name + "_constr;\n"
 112                 pf = ""
 113                 if ty_info.is_ptr:
 114                     pf = "\t"
 115                     arg_conv += ty_info.rust_obj + " *" + arr_name + "_ptr = NULL;\n"
 116                     arg_conv += "if (" + self.consts.is_arr_some_check[0] + arr_name + self.consts.is_arr_some_check[1] + ") {\n"
 117                 arg_conv += pf + arr_name + "_constr." + arr_len + " = " + self.consts.get_native_arr_len_call[0] + arr_name + self.consts.get_native_arr_len_call[1] + ";\n"
 118                 arg_conv += pf + "if (" + arr_name + "_constr." + arr_len + " > 0)\n"
 119                 if subty.is_native_primitive:
 120                     szof = subty.c_ty
 121                 else:
 122                     szof = subty.rust_obj
 123                 arg_conv += pf + "\t" + arr_name + "_constr." + ty_info.arr_access + " = MALLOC(" + arr_name + "_constr." + arr_len + " * sizeof(" + szof + "), \"" + ty_info.rust_obj + " Elements\");\n"
 124                 arg_conv += pf + "else\n"
 125                 arg_conv += pf + "\t" + arr_name + "_constr." + ty_info.arr_access + " = NULL;\n"
 126                 get_arr = self.consts.get_native_arr_contents(arr_name, "NO_DEST", arr_name + "_constr." + arr_len, ty_info, False)
 127                 if get_arr != None:
 128                     arg_conv += pf + subty.c_ty + "* " + arr_name + "_vals = " + get_arr + ";\n"
 129                 arg_conv += pf + "for (size_t " + idxc + " = 0; " + idxc + " < " + arr_name + "_constr." + arr_len + "; " + idxc + "++) {\n"
 130                 if get_arr != None:
 131                     arg_conv += pf + "\t" + subty.c_ty + " " + conv_name + " = " + arr_name + "_vals[" + idxc + "];"
 132                     if subty.arg_conv is not None:
 133                         arg_conv += "\n\t" + pf + subty.arg_conv.replace("\n", "\n\t" + pf)
 134                 else:
 135                     arg_conv += pf + "\t" + subty.c_ty + " " + conv_name + " = " + self.consts.get_native_arr_elem(arr_name, idxc, ty_info) + ";\n"
 136                     arg_conv += pf + "\t" + subty.arg_conv.replace("\n", "\n\t" + pf)
 137                 arg_conv += "\n\t" + pf + arr_name + "_constr." + ty_info.arr_access + "[" + idxc + "] = " + subty.arg_conv_name + ";\n" + pf + "}"
 138                 if get_arr != None:
 139                     cleanup = self.consts.cleanup_native_arr_ref_contents(arr_name, arr_name + "_vals", arr_name + "_constr." + arr_len, ty_info)
 140                     if cleanup is not None:
 141                         arg_conv += "\n" + pf + cleanup + ";"
 142                 if ty_info.is_ptr:
 143                     arg_conv_name = arr_name + "_ptr"
 144                 else:
 145                     arg_conv_name = arr_name + "_constr"
 146                 arg_conv_cleanup = None
 147                 if ty_info.is_ptr:
 148                     arg_conv_cleanup = "if (" + arr_name + "_ptr != NULL) { FREE(" + arr_name + "_constr." + ty_info.arr_access + "); }"
 149                 if ty_info.is_ptr:
 150                     arg_conv += "\n\t" + arr_name + "_ptr = &" + arr_name + "_constr;\n}"
 151
 152                 if is_nullable:
 153                     ret_conv = (ty_info.rust_obj + " *" + arr_name + "_var_ptr = ", "")
 154                 else:
 155                     ret_conv = (ty_info.rust_obj + " " + arr_name + "_var = ", "")
 156                 if subty.ret_conv is None:
 157                     ret_conv = ("DUMMY", "DUMMY")
 158                 else:
 159                     ret_conv = (ret_conv[0], ";\n" + ty_info.c_ty + " " + arr_name + "_arr = NULL;\n")
 160                     indent = ""
 161                     if is_nullable:
 162                         ret_conv = (ret_conv[0], ret_conv[1] + "if (" + arr_name + " != NULL) {\n")
 163                         ret_conv = (ret_conv[0], ret_conv[1] + "\t" + ty_info.rust_obj + " " + arr_name + "_var = *" + arr_name + "_var_ptr;\n")
 164                         indent = "\t"
 165                     ret_conv = (ret_conv[0], ret_conv[1] + indent + arr_name + "_arr = " + self.consts.create_native_arr_call(arr_name + "_var." + arr_len, ty_info) + ";\n")
 166                     get_ptr_call = self.consts.get_native_arr_ptr_call(ty_info)
 167                     if get_ptr_call is not None:
 168                         ret_conv = (ret_conv[0], ret_conv[1] + indent + subty.c_ty + " *" + arr_name + "_arr_ptr = " + get_ptr_call[0] + arr_name + "_arr" + get_ptr_call[1] + ";\n")
 169                     ret_conv = (ret_conv[0], ret_conv[1] + indent + "for (size_t " + idxc + " = 0; " + idxc + " < " + arr_name + "_var." + arr_len + "; " + idxc + "++) {\n")
 170                     ret_conv = (ret_conv[0], ret_conv[1] + indent + "\t" + subty.ret_conv[0].replace("\n", "\n\t" + indent))
 171                     ret_conv = (ret_conv[0], ret_conv[1] + indent + arr_name + "_var." + ty_info.arr_access + "[" + idxc + "]" + subty.ret_conv[1].replace("\n", "\n\t" + indent) + "\n")
 172                     if get_ptr_call is not None:
 173                         ret_conv = (ret_conv[0], ret_conv[1] + indent + "\t" + arr_name + "_arr_ptr[" + idxc + "] = " + subty.ret_conv_name + ";\n" + indent + "}\n")
 174                     else:
 175                         ret_conv = (ret_conv[0], ret_conv[1] + indent + "\t" + self.consts.get_native_arr_entry_call(ty_info, arr_name + "_arr", idxc, subty.ret_conv_name) + ";\n" + indent + "}\n")
 176                     cleanup = self.consts.release_native_arr_ptr_call(ty_info, arr_name + "_arr", arr_name + "_arr_ptr")
 177                     if cleanup is not None:
 178                         ret_conv = (ret_conv[0], ret_conv[1] + indent + cleanup + ";")
 179                     if not holds_ref and not is_nullable:
 180                         # XXX: The commented if's are a bit smarter freeing, but we need to be a nudge smarter still
 181                         # Note that we don't drop the full vec here - we're passing ownership to java (or have cloned) or free'd by now!
 182                         ret_conv = (ret_conv[0], ret_conv[1] + "\n" + indent + "FREE(" + arr_name + "_var." + ty_info.arr_access + ");")
 183                         #if subty.rust_obj is not None and subty.rust_obj in self.opaque_structs:
 184                         #    ret_conv = (ret_conv[0], ret_conv[1] + "\nFREE(" + arr_name + "_var." + ty_info.arr_access + ");")
 185                         #else:
 186                         #    ret_conv = (ret_conv[0], ret_conv[1] + "\n" + ty_info.rust_obj.replace("LDK", "") + "_free(" + arr_name + "_var);")
 187                     if is_nullable:
 188                         ret_conv = (ret_conv[0], ret_conv[1] + "\n}")
 189
 190                 to_hu_conv = None
 191                 to_hu_conv_name = None
 192                 if subty.to_hu_conv is not None:
 193                     to_hu_conv = self.consts.var_decl_statement(self.consts.c_type_map["uint32_t"][0], conv_name + "_len", self.consts.get_java_arr_len(arr_name)) + ";\n"
 194                     to_hu_conv += self.consts.var_decl_statement(ty_info.java_hu_ty, conv_name + "_arr", self.consts.constr_hu_array(ty_info, conv_name + "_len"))
 195                     to_hu_conv += ";\n" + self.consts.for_n_in_range(idxc, "0", conv_name + "_len") + "\n"
 196                     to_hu_conv += "\t" + self.consts.var_decl_statement(subty.java_ty, conv_name, self.consts.get_java_arr_elem(subty, arr_name, idxc)) + ";\n"
 197                     to_hu_conv += "\t" + subty.to_hu_conv.replace("\n", "\n\t") + "\n"
 198                     to_hu_conv += "\t" + conv_name + "_arr[" + idxc + "] = " + subty.to_hu_conv_name + ";\n}"
 199                     cleanup = self.consts.cleanup_converted_native_array(ty_info, arr_name)
 200                     if cleanup is not None:
 201                         to_hu_conv += "\n" + cleanup
 202                     to_hu_conv_name = conv_name + "_arr"
 203                 from_hu_conv = self.consts.primitive_arr_from_hu(ty_info.subty, None, arr_name)
 204                 if subty.from_hu_conv is not None:
 205                     hu_conv_b = ""
 206                     if subty.from_hu_conv[1] != "":
 207                         iterator = self.consts.for_n_in_arr(conv_name, arr_name, subty)
 208                         hu_conv_b = iterator[0] + subty.from_hu_conv[1] + ";" + iterator[1]
 209                     if from_hu_conv is not None:
 210                         arr_conv = self.consts.primitive_arr_from_hu(ty_info.subty, None, self.consts.map_hu_array_elems(arr_name, conv_name, ty_info, subty))
 211                         assert arr_conv[1] == ""
 212                         from_hu_conv = (arr_conv[0], hu_conv_b)
 213                     else:
 214                         from_hu_conv = (self.consts.map_hu_array_elems(arr_name, conv_name, ty_info, subty), hu_conv_b)
 215
 216                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 217                     arg_conv = arg_conv, arg_conv_name = arg_conv_name, arg_conv_cleanup = arg_conv_cleanup,
 218                     ret_conv = ret_conv, ret_conv_name = arr_name + "_arr", to_hu_conv = to_hu_conv, to_hu_conv_name = to_hu_conv_name, from_hu_conv = from_hu_conv)
 219         elif ty_info.java_fn_ty_arg == "Ljava/lang/String;":
 220             assert not is_nullable
 221             if not is_free:
 222                 arg_conv = "LDKStr " + ty_info.var_name + "_conv = " + self.consts.str_ref_to_c_call(ty_info.var_name) + ";"
 223                 arg_conv_name = ty_info.var_name + "_conv"
 224             else:
 225                 arg_conv = "LDKStr dummy = { .chars = NULL, .len = 0, .chars_is_owned = false };"
 226                 arg_conv_name = "dummy"
 227             if ty_info.arr_access is None:
 228                 assert False
 229                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 230                     arg_conv = arg_conv, arg_conv_name = arg_conv_name, arg_conv_cleanup = None,
 231                     ret_conv = ("const char* " + ty_info.var_name + "_str = ",
 232                         ";\njstring " + ty_info.var_name + "_conv = " + self.consts.str_ref_to_native_call(ty_info.var_name + "_str", "strlen(" + ty_info.var_name + "_str)") + ";"),
 233                     ret_conv_name = ty_info.var_name + "_conv",
 234                     to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 235             else:
 236                 free_str = ""
 237                 if not holds_ref:
 238                     free_str = "\nStr_free(" + ty_info.var_name + "_str);"
 239                 to_hu_conv = self.consts.str_to_hu_conv(ty_info.var_name)
 240                 to_hu_conv_name = None
 241                 if to_hu_conv is not None:
 242                     to_hu_conv_name = ty_info.var_name + "_conv"
 243                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 244                     arg_conv = arg_conv, arg_conv_name = arg_conv_name, arg_conv_cleanup = None,
 245                     ret_conv = ("LDKStr " + ty_info.var_name + "_str = ",
 246                         ";\njstring " + ty_info.var_name + "_conv = " + self.consts.str_ref_to_native_call(ty_info.var_name + "_str." + ty_info.arr_access, ty_info.var_name + "_str." + ty_info.arr_len) + ";" + free_str),
 247                     ret_conv_name = ty_info.var_name + "_conv",
 248                     to_hu_conv=to_hu_conv, to_hu_conv_name=to_hu_conv_name,
 249                     from_hu_conv = self.consts.str_from_hu_conv(ty_info.var_name))
 250         elif ty_info.var_name == "" and not print_void:
 251             # We don't have a parameter name, and want one, just call it arg
 252             if not ty_info.is_native_primitive:
 253                 assert(not is_free or ty_info.rust_obj not in self.opaque_structs)
 254                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 255                     arg_conv = ty_info.rust_obj + " arg_conv = *(" + ty_info.rust_obj + "*)arg;\nFREE((void*)arg);",
 256                     arg_conv_name = "arg_conv", arg_conv_cleanup = None,
 257                     ret_conv = None, ret_conv_name = None, to_hu_conv = "TODO 7", to_hu_conv_name = None, from_hu_conv = None)
 258             else:
 259                 assert(not is_free)
 260                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 261                     arg_conv = None, arg_conv_name = "arg", arg_conv_cleanup = None,
 262                     ret_conv = None, ret_conv_name = None, to_hu_conv = "TODO 8", to_hu_conv_name = None, from_hu_conv = None)
 263         elif ty_info.is_native_primitive:
 264             assert not is_nullable
 265             return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 266                 arg_conv = None, arg_conv_name = ty_info.var_name, arg_conv_cleanup = None,
 267                 ret_conv = None, ret_conv_name = None, to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 268         else:
 269             if ty_info.var_name == "":
 270                 ty_info.var_name = "ret"
 271
 272             if ty_info.rust_obj in self.opaque_structs:
 273                 from_hu_conv = (ty_info.var_name + " == null ? 0 : " + self.consts.get_ptr(ty_info.var_name) + " & ~1", self.consts.add_ref("this", ty_info.var_name))
 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                 if ty_info.is_ptr and holds_ref:
 277                     opaque_arg_conv += ty_info.var_name + "_conv.is_owned = false;\n"
 278                 else:
 279                     opaque_arg_conv += ty_info.var_name + "_conv.is_owned = (" + ty_info.var_name + " & 1) || (" + ty_info.var_name + " == 0);\n"
 280                 opaque_arg_conv += "CHECK_INNER_FIELD_ACCESS_OR_NULL(" + ty_info.var_name + "_conv);"
 281                 if not is_free and (not ty_info.is_ptr or not holds_ref or ty_info.requires_clone == True) and ty_info.requires_clone != False:
 282                     if (ty_info.rust_obj.replace("LDK", "") + "_clone") in self.clone_fns:
 283                         # 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.
 284                         # arg_conv is used when converting a function argument from java normally (with holds_ref set),
 285                         # and when converting a java value being returned from a trait method (with holds_ref unset).
 286                         # In the second case, we need to clone before returning to C (as once we return the GC can free the object),
 287                         # whereas in the first we prefer to clone in C to avoid additional Java code as much as possible.
 288                         if holds_ref:
 289                             opaque_arg_conv = opaque_arg_conv + "\n" + ty_info.var_name + "_conv = " + ty_info.rust_obj.replace("LDK", "") + "_clone(&" + ty_info.var_name + "_conv);"
 290                             from_hu_conv = (from_hu_conv[0], "")
 291                         else:
 292                             from_hu_conv = (ty_info.var_name + " == null ? 0 : " + ty_info.var_name + ".clone_ptr()", "")
 293                     elif ty_info.passed_as_ptr:
 294                         opaque_arg_conv = opaque_arg_conv + "\n// Warning: we need a move here but no clone is available for " + ty_info.rust_obj
 295                         # TODO: Once we support features cloning (which just isn't in C yet), we can make this a compile error instead!
 296                         from_hu_conv = (from_hu_conv[0], from_hu_conv[1] + ";\n" +
 297                             "// Due to rust's strict-ownership memory model, in some cases we need to \"move\"\n" +
 298                             "// an object to pass exclusive ownership to the function being called.\n" +
 299                             "// In most cases, we avoid this being visible in GC'd languages by cloning the object\n" +
 300                             "// at the FFI layer, creating a new object which Rust can claim ownership of\n" +
 301                             "// However, in some cases (eg here), there is no way to clone an object, and thus\n" +
 302                             "// we actually have to pass full ownership to Rust.\n" +
 303                             "// Thus, after this call, " + ty_info.var_name + " is reset to null and is now a dummy object.\n" + self.consts.set_null_skip_free(ty_info.var_name))
 304
 305                 opaque_ret_conv_suf = ";\n"
 306                 opaque_ret_conv_suf += "uintptr_t " + ty_info.var_name + "_ref = 0;\n"
 307                 indent = ""
 308                 if is_nullable:
 309                     opaque_ret_conv_suf += "if ((uintptr_t)" + ty_info.var_name + "_var.inner > 4096) {\n"
 310                     indent = "\t"
 311                 if not holds_ref and ty_info.is_ptr and (ty_info.rust_obj.replace("LDK", "") + "_clone") in self.clone_fns: # is_ptr, not holds_ref implies passing a pointed-to value to java, which needs copied
 312                     opaque_ret_conv_suf += indent + ty_info.var_name + "_var = " + ty_info.rust_obj.replace("LDK", "") + "_clone(" + ty_info.var_name + ");\n"
 313                 elif not holds_ref and ty_info.is_ptr:
 314                     opaque_ret_conv_suf += indent + "// Warning: we may need a move here but no clone is available for " + ty_info.rust_obj + "\n"
 315
 316                 opaque_ret_conv_suf += indent + "CHECK((((uintptr_t)" + ty_info.var_name + "_var.inner) & 1) == 0); // We rely on a free low bit, malloc guarantees this.\n"
 317                 opaque_ret_conv_suf += indent + "CHECK((((uintptr_t)&" + ty_info.var_name + "_var) & 1) == 0); // We rely on a free low bit, pointer alignment guarantees this.\n"
 318                 opaque_ret_conv_suf += "CHECK_INNER_FIELD_ACCESS_OR_NULL(" + ty_info.var_name + "_var);\n"
 319                 if holds_ref:
 320                     opaque_ret_conv_suf += indent + ty_info.var_name + "_ref = (uintptr_t)" + ty_info.var_name + "_var.inner & ~1;"
 321                 else:
 322                     opaque_ret_conv_suf += indent + ty_info.var_name + "_ref = (uintptr_t)" + ty_info.var_name + "_var.inner;\n"
 323                     opaque_ret_conv_suf += indent + "if (" + ty_info.var_name + "_var.is_owned) {\n"
 324                     opaque_ret_conv_suf += indent + "\t" + ty_info.var_name + "_ref |= 1;\n"
 325                     opaque_ret_conv_suf += indent + "}"
 326                 if is_nullable:
 327                     opaque_ret_conv_suf += "\n}"
 328
 329                 to_hu_conv_sfx = ""
 330                 if not ty_info.is_ptr or holds_ref:
 331                     to_hu_conv_sfx = "\n" + self.consts.add_ref(ty_info.var_name + "_hu_conv", "this") + ";"
 332                 if ty_info.is_ptr:
 333                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 334                         arg_conv = opaque_arg_conv, arg_conv_name = "&" + ty_info.var_name + "_conv", arg_conv_cleanup = None,
 335                         ret_conv = (ty_info.rust_obj + " " + ty_info.var_name + "_var = *", opaque_ret_conv_suf),
 336                         ret_conv_name = ty_info.var_name + "_ref",
 337                         to_hu_conv = self.consts.to_hu_conv_templates['ptr'].replace('{human_type}', ty_info.java_hu_ty).replace('{var_name}', ty_info.var_name) + to_hu_conv_sfx,
 338                         to_hu_conv_name = ty_info.var_name + "_hu_conv",
 339                         from_hu_conv = from_hu_conv)
 340                 else:
 341                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 342                         arg_conv = opaque_arg_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 343                         ret_conv = (ty_info.rust_obj + " " + ty_info.var_name + "_var = ", opaque_ret_conv_suf),
 344                         ret_conv_name = ty_info.var_name + "_ref",
 345                         to_hu_conv = self.consts.to_hu_conv_templates['default'].replace('{human_type}', ty_info.java_hu_ty).replace('{var_name}', ty_info.var_name) + to_hu_conv_sfx,
 346                         to_hu_conv_name = ty_info.var_name + "_hu_conv",
 347                         from_hu_conv = from_hu_conv)
 348
 349             assert not is_nullable
 350             if not ty_info.is_ptr:
 351                 if ty_info.rust_obj in self.unitary_enums:
 352                     (ret_pfx, ret_sfx) = self.consts.c_unitary_enum_to_native_call(ty_info)
 353                     (arg_pfx, arg_sfx) = self.consts.native_unitary_enum_to_c_call(ty_info)
 354                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 355                         arg_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv = " + arg_pfx + ty_info.var_name + arg_sfx + ";",
 356                         arg_conv_name = ty_info.var_name + "_conv",
 357                         arg_conv_cleanup = None,
 358                         ret_conv = (ty_info.c_ty + " " + ty_info.var_name + "_conv = " + ret_pfx, ret_sfx + ";"),
 359                         ret_conv_name = ty_info.var_name + "_conv", to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 360                 base_conv = "void* " + ty_info.var_name + "_ptr = (void*)(((uintptr_t)" + ty_info.var_name + ") & ~1);\n"
 361                 base_conv += "CHECK_ACCESS(" + ty_info.var_name + "_ptr);\n"
 362                 base_conv += ty_info.rust_obj + " " + ty_info.var_name + "_conv = *(" + ty_info.rust_obj + "*)(" + ty_info.var_name + "_ptr);"
 363                 from_hu_conv = None
 364                 if ty_info.rust_obj in self.trait_structs:
 365                     ret_conv = (ty_info.rust_obj + "* " + ty_info.var_name + "_ret = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n*" + ty_info.var_name + "_ret = ", ";")
 366                     if holds_ref:
 367                         if (ty_info.rust_obj.replace("LDK", "") + "_clone") in self.clone_fns:
 368                             ret_conv = (ret_conv[0] + ty_info.rust_obj.replace("LDK", "") + "_clone(&", ");")
 369                         else:
 370                             ret_conv = (ret_conv[0], ";\n// Warning: We likely need to clone here, but no clone is available, so we just do it for Java instances")
 371                             ret_conv = (ret_conv[0], ret_conv[1] + "" + self.consts.trait_struct_inc_refcnt(ty_info).replace(ty_info.var_name + "_conv", "(*" + ty_info.var_name + "_ret)"))
 372                     if not is_free:
 373                         needs_full_clone = not is_free and (not ty_info.is_ptr and not holds_ref or ty_info.requires_clone == True) and ty_info.requires_clone != False
 374                         if needs_full_clone and (ty_info.rust_obj.replace("LDK", "") + "_clone") in self.clone_fns:
 375                             # arg_conv is used when converting a function argument from java normally (with holds_ref set),
 376                             # and when converting a java value being returned from a trait method (with holds_ref unset).
 377                             # In the second case, we need to clone before returning to C (as once we return the GC can free the object),
 378                             # whereas in the first we prefer to clone in C to avoid additional Java code as much as possible.
 379                             if holds_ref:
 380                                 base_conv += "\n" + ty_info.var_name + "_conv = " + ty_info.rust_obj.replace("LDK", "") + "_clone(&" + ty_info.var_name + "_conv);"
 381                             else:
 382                                 from_hu_conv = (ty_info.var_name + " == null ? 0 : " + ty_info.var_name + ".clone_ptr()", "")
 383                                 base_conv += "\n" + "FREE((void*)" + ty_info.var_name + ");"
 384                         else:
 385                             base_conv = base_conv + self.consts.trait_struct_inc_refcnt(ty_info)
 386                             if needs_full_clone:
 387                                 base_conv = base_conv + "// Warning: we may need a move here but no clone is available for " + ty_info.rust_obj + "\n"
 388                     else:
 389                         base_conv = base_conv + "\n" + "FREE((void*)" + ty_info.var_name + ");"
 390                     if from_hu_conv is None:
 391                         from_hu_conv = (ty_info.var_name + " == null ? 0 : " + self.consts.get_ptr(ty_info.var_name), "")
 392                     from_hu_conv = (from_hu_conv[0], self.consts.add_ref("this", ty_info.var_name))
 393                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 394                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 395                         ret_conv = ret_conv, ret_conv_name = "(uintptr_t)" + ty_info.var_name + "_ret",
 396                         to_hu_conv = self.consts.var_decl_statement(ty_info.java_hu_ty, "ret_hu_conv", "new " + ty_info.java_hu_ty + "(null, " + ty_info.var_name + ")") + ";\n" + self.consts.add_ref("ret_hu_conv", "this") + ";",
 397                         to_hu_conv_name = "ret_hu_conv", from_hu_conv = from_hu_conv)
 398                 needs_full_clone = not is_free and (not ty_info.is_ptr or ty_info.requires_clone == True) and ty_info.requires_clone != False
 399                 if needs_full_clone:
 400                     if "res" in ty_info.var_name: # XXX: This is a stupid hack
 401                         needs_full_clone = False
 402                     if needs_full_clone and (ty_info.rust_obj.replace("LDK", "") + "_clone") in self.clone_fns:
 403                         # arg_conv is used when converting a function argument from java normally (with holds_ref set),
 404                         # and when converting a java value being returned from a trait method (with holds_ref unset).
 405                         # In the second case, we need to clone before returning to C (as once we return the GC can free the object),
 406                         # whereas in the first we prefer to clone in C to avoid additional Java code as much as possible.
 407                         if holds_ref:
 408                             base_conv += "\n" + ty_info.var_name + "_conv = " + ty_info.rust_obj.replace("LDK", "") + "_clone((" + ty_info.rust_obj + "*)(((uintptr_t)" + ty_info.var_name + ") & ~1));"
 409                         else:
 410                             from_hu_conv = (ty_info.var_name + " == null ? 0 : " + ty_info.var_name + ".clone_ptr()", "")
 411                             base_conv += "\n" + "FREE((void*)" + ty_info.var_name + ");"
 412                     elif needs_full_clone:
 413                         base_conv = base_conv + "\n// Warning: we may need a move here but no clone is available for " + ty_info.rust_obj
 414                 if not needs_full_clone and ty_info.rust_obj != "LDKu8slice" and (not holds_ref or is_free):
 415                     # Don't bother free'ing slices passed in - Rust doesn't auto-free the
 416                     # underlying unlike Vecs, and it gives Java more freedom.
 417                     base_conv = base_conv + "\nFREE((void*)" + ty_info.var_name + ");"
 418                 if ty_info.rust_obj in self.complex_enums:
 419                     to_hu_conv_sfx = ""
 420                     if needs_full_clone and (ty_info.rust_obj.replace("LDK", "") + "_clone") not in self.clone_fns:
 421                         # We really need a full clone here, but for now we just implement
 422                         # a manual clone explicitly for Option<Trait>s
 423                         if ty_info.contains_trait:
 424                             assert ty_info.rust_obj.startswith("LDKCOption") # We don't support contained traits for anything else yet
 425                             optional_ty = ty_info.rust_obj[11:-1]
 426                             assert "LDK" + optional_ty in self.trait_structs # We don't support contained traits for anything else yet
 427                             to_hu_conv_sfx = self.consts.add_ref("this", ty_info.var_name)
 428                             base_conv += "\nif (" + ty_info.var_name + "_conv.tag == " + ty_info.rust_obj + "_Some) {"
 429                             base_conv += "\n\t// Manually implement clone for Java trait instances"
 430                             optional_ty_info = self.java_c_types("LDK" + optional_ty + " " + ty_info.var_name, None)
 431                             base_conv += self.consts.trait_struct_inc_refcnt(optional_ty_info).\
 432                                 replace("\n", "\n\t").replace(ty_info.var_name + "_conv", ty_info.var_name + "_conv.some")
 433                             base_conv += "\n}"
 434                     ret_conv = ("uintptr_t " + ty_info.var_name + "_ref = ((uintptr_t)&", ") | 1;")
 435                     if not holds_ref:
 436                         ret_conv = (ty_info.rust_obj + " *" + ty_info.var_name + "_copy = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n", "")
 437                         ret_conv = (ret_conv[0] + "*" + ty_info.var_name + "_copy = ", "")
 438                         ret_conv = (ret_conv[0], ";\nuintptr_t " + ty_info.var_name + "_ref = (uintptr_t)" + ty_info.var_name + "_copy;")
 439                     if from_hu_conv is None:
 440                         from_hu_conv = (self.consts.get_ptr(ty_info.var_name), "")
 441                     from_hu_conv = (from_hu_conv[0], to_hu_conv_sfx)
 442                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 443                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 444                         ret_conv = ret_conv, ret_conv_name = ty_info.var_name + "_ref",
 445                         to_hu_conv = self.consts.var_decl_statement(ty_info.java_hu_ty, ty_info.var_name + "_hu_conv", ty_info.java_hu_ty + ".constr_from_ptr(" + ty_info.var_name + ")") + ";\n" + self.consts.add_ref(ty_info.var_name + "_hu_conv", "this") + ";",
 446                         to_hu_conv_name = ty_info.var_name + "_hu_conv", from_hu_conv = from_hu_conv)
 447                 if ty_info.rust_obj in self.result_types:
 448                     if holds_ref:
 449                         # If we're trying to return a ref, we have to clone.
 450                         # We just blindly assume its implemented and let the compiler fail if its not.
 451                         ret_conv = (ty_info.rust_obj + "* " + ty_info.var_name + "_conv = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n*" + ty_info.var_name + "_conv = ", ";")
 452                         ret_conv = (ret_conv[0], ret_conv[1] + "\n*" + ty_info.var_name + "_conv = " + ty_info.rust_obj.replace("LDK", "") + "_clone(" + ty_info.var_name + "_conv);")
 453                     else:
 454                         ret_conv = (ty_info.rust_obj + "* " + ty_info.var_name + "_conv = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n*" + ty_info.var_name + "_conv = ", ";")
 455                     if from_hu_conv is None:
 456                         from_hu_conv = (ty_info.var_name + " != null ? " + self.consts.get_ptr(ty_info.var_name) + " : 0", "")
 457                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 458                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 459                         ret_conv = ret_conv, ret_conv_name = "(uintptr_t)" + ty_info.var_name + "_conv",
 460                         to_hu_conv = self.consts.var_decl_statement(ty_info.java_hu_ty, ty_info.var_name + "_hu_conv", ty_info.java_hu_ty + ".constr_from_ptr(" + ty_info.var_name + ")") + ";",
 461                         to_hu_conv_name = ty_info.var_name + "_hu_conv", from_hu_conv = from_hu_conv)
 462                 if ty_info.rust_obj in self.tuple_types:
 463                     ret_conv_name = "((uintptr_t)" + ty_info.var_name + "_conv)"
 464                     if holds_ref:
 465                         # If we're trying to return a ref, we have to clone.
 466                         if (ty_info.rust_obj.replace("LDK", "") + "_clone") not in self.clone_fns:
 467                             ret_conv = (ty_info.rust_obj + "* " + ty_info.var_name + "_conv = &", "")
 468                             ret_conv = (ret_conv[0], ";\n// Warning: we really need to clone here, but no clone is available for " + ty_info.rust_obj)
 469                             ret_conv_name += " | 1"
 470                         else:
 471                             ret_conv = (ty_info.rust_obj + "* " + ty_info.var_name + "_conv = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n*" + ty_info.var_name + "_conv = ", ";")
 472                             ret_conv = (ret_conv[0], ret_conv[1] + "\n*" + ty_info.var_name + "_conv = " + ty_info.rust_obj.replace("LDK", "") + "_clone(" + ty_info.var_name + "_conv);")
 473                     else:
 474                         ret_conv = (ty_info.rust_obj + "* " + ty_info.var_name + "_conv = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n*" + ty_info.var_name + "_conv = ", ";")
 475                     if not ty_info.is_ptr or holds_ref:
 476                         to_hu_conv_sfx = "\n" + self.consts.add_ref(ty_info.var_name + "_hu_conv", "this") + ";"
 477                     else:
 478                         to_hu_conv_sfx = ""
 479                     if from_hu_conv is None:
 480                         from_hu_conv = (ty_info.var_name + " != null ? " + self.consts.get_ptr(ty_info.var_name) + " : 0", "")
 481                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 482                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 483                         ret_conv = ret_conv, ret_conv_name = ret_conv_name,
 484                         to_hu_conv = self.consts.var_decl_statement(ty_info.java_hu_ty, ty_info.var_name + "_hu_conv", "new " + ty_info.java_hu_ty + "(null, " + ty_info.var_name + ")") + ";" + to_hu_conv_sfx,
 485                         to_hu_conv_name = ty_info.var_name + "_hu_conv", from_hu_conv = from_hu_conv)
 486
 487                 # The manually-defined types - TxOut and u5
 488                 if ty_info.rust_obj == "LDKu5":
 489                     assert from_hu_conv is None
 490                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 491                         arg_conv = "", arg_conv_name = "(LDKu5){ ._0 = " + ty_info.var_name + " }", arg_conv_cleanup = None,
 492                         ret_conv = ("uint8_t " + ty_info.var_name + "_val = ", "._0;"), ret_conv_name = ty_info.var_name + "_val",
 493                         to_hu_conv = self.consts.var_decl_statement(ty_info.java_hu_ty, ty_info.var_name + "_conv", "new " + ty_info.java_hu_ty + "(" + ty_info.var_name + ")") + ";",
 494                         to_hu_conv_name = ty_info.var_name + "_conv", from_hu_conv = (ty_info.var_name + ".getVal()", ""))
 495
 496                 assert ty_info.rust_obj == "LDKTxOut"
 497                 if not ty_info.is_ptr and not holds_ref:
 498                     ret_conv = ("LDKTxOut* " + ty_info.var_name + "_ref = MALLOC(sizeof(LDKTxOut), \"LDKTxOut\");\n*" + ty_info.var_name + "_ref = ", ";")
 499                 else:
 500                     ret_conv = ("uintptr_t " + ty_info.var_name + "_ref = ((uintptr_t)&", ") | 1;")
 501                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 502                     arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 503                     ret_conv = ret_conv, ret_conv_name = "(uintptr_t)" + ty_info.var_name + "_ref",
 504                     to_hu_conv = self.consts.var_decl_statement(ty_info.java_hu_ty, ty_info.var_name + "_conv", "new " +ty_info.java_hu_ty + "(null, " + ty_info.var_name + ")") + ";",
 505                     to_hu_conv_name = ty_info.var_name + "_conv", from_hu_conv = (self.consts.get_ptr(ty_info.var_name), ""))
 506             elif ty_info.is_ptr:
 507                 assert(not is_free)
 508                 if ty_info.rust_obj in self.complex_enums:
 509                     ret_conv = ("uintptr_t ret_" + ty_info.var_name + " = (uintptr_t)", " | 1; // Warning: We should clone here!")
 510                     from_hu_sfx = self.consts.add_ref("this", ty_info.var_name)
 511                     if ty_info.rust_obj.replace("LDK", "") + "_clone" in self.clone_fns:
 512                         ret_conv_pfx = ty_info.rust_obj + " *ret_" + ty_info.var_name + " = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + " ret conversion\");\n"
 513                         ret_conv_pfx += "*ret_" + ty_info.var_name + " = " + ty_info.rust_obj.replace("LDK", "") + "_clone("
 514                         ret_conv = (ret_conv_pfx, ");")
 515                         from_hu_sfx = ""
 516                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 517                         arg_conv = ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)" + ty_info.var_name + ";",
 518                         arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 519                         ret_conv = ret_conv, ret_conv_name = "(uintptr_t)ret_" + ty_info.var_name,
 520                         to_hu_conv = self.consts.var_decl_statement(ty_info.java_hu_ty, ty_info.var_name + "_hu_conv", ty_info.java_hu_ty + ".constr_from_ptr(" + ty_info.var_name + ")") + ";",
 521                         to_hu_conv_name = ty_info.var_name + "_hu_conv",
 522                         from_hu_conv = (ty_info.var_name + " == null ? 0 : " + self.consts.get_ptr(ty_info.var_name) + " & ~1", from_hu_sfx))
 523                 elif ty_info.rust_obj in self.trait_structs:
 524                     if ty_info.nonnull_ptr:
 525                         arg_conv = "void* " + ty_info.var_name + "_ptr = (void*)(((uintptr_t)" + ty_info.var_name + ") & ~1);\n"
 526                         arg_conv += "if (!(" + ty_info.var_name + " & 1)) { CHECK_ACCESS(" + ty_info.var_name + "_ptr); }\n"
 527                         arg_conv += ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)" + ty_info.var_name + "_ptr;"
 528                         arg_conv_name = ty_info.var_name + "_conv"
 529                     else:
 530                         # We map Option<Trait> as *mut Trait, which we can differentiate from &Trait by the NONNULL_PTR annotation.
 531                         # We handle the Option<Trait> case here.
 532                         arg_conv = ty_info.rust_obj + " *" + ty_info.var_name + "_conv_ptr = NULL;\n"
 533                         arg_conv += "if (" + ty_info.var_name + " != 0) {\n"
 534                         arg_conv += "\t" + ty_info.rust_obj + " " + ty_info.var_name + "_conv;\n"
 535                         arg_conv += "void* " + ty_info.var_name + "_ptr = (void*)(((uintptr_t)" + ty_info.var_name + ") & ~1);\n"
 536                         arg_conv += "CHECK_ACCESS(" + ty_info.var_name + "_ptr);\n"
 537                         arg_conv += "\t" + ty_info.var_name + "_conv = *(" + ty_info.rust_obj + "*)" + ty_info.var_name + "_ptr;"
 538                         arg_conv += self.consts.trait_struct_inc_refcnt(ty_info).replace("\n", "\n\t")
 539                         arg_conv += "\n\t" + ty_info.var_name + "_conv_ptr = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n"
 540                         arg_conv += "\t*" + ty_info.var_name + "_conv_ptr = " + ty_info.var_name + "_conv;\n"
 541                         arg_conv += "}"
 542                         arg_conv_name = ty_info.var_name + "_conv_ptr"
 543                     if ty_info.rust_obj.replace("LDK", "") + "_clone" in self.clone_fns:
 544                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 545                             arg_conv = arg_conv, arg_conv_name = arg_conv_name, arg_conv_cleanup = None,
 546                             ret_conv = (ty_info.rust_obj + " *" + ty_info.var_name + "_clone = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n" +
 547                                 "*" + ty_info.var_name + "_clone = " + ty_info.rust_obj.replace("LDK", "") + "_clone(", ");"),
 548                             ret_conv_name = "(uintptr_t)" + ty_info.var_name + "_clone",
 549                             to_hu_conv = self.consts.var_decl_statement(ty_info.java_hu_ty, "ret_hu_conv", "new " + ty_info.java_hu_ty + "(null, " + ty_info.var_name + ")") + ";\n" + self.consts.add_ref("ret_hu_conv", "this") + ";",
 550                             to_hu_conv_name = "ret_hu_conv",
 551                             from_hu_conv = (ty_info.var_name + " == null ? 0 : " + self.consts.get_ptr(ty_info.var_name), ""))
 552                     else:
 553                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 554                             arg_conv = arg_conv, arg_conv_name = arg_conv_name, arg_conv_cleanup = None,
 555                             ret_conv = ("// WARNING: This object doesn't live past this scope, needs clone!\nuintptr_t ret_" + ty_info.var_name + " = ((uintptr_t)", ") | 1;"),
 556                             ret_conv_name = "ret_" + ty_info.var_name,
 557                             to_hu_conv = self.consts.var_decl_statement(ty_info.java_hu_ty, "ret_hu_conv", "new " + ty_info.java_hu_ty + "(null, " + ty_info.var_name + ")") + ";\n" + self.consts.add_ref("ret_hu_conv", "this") + ";",
 558                             to_hu_conv_name = "ret_hu_conv",
 559                             from_hu_conv = (ty_info.var_name + " == null ? 0 : " + self.consts.get_ptr(ty_info.var_name), self.consts.add_ref("this", ty_info.var_name)))
 560                 ret_conv = ("uintptr_t ret_" + ty_info.var_name + " = (uintptr_t)", ";")
 561                 if holds_ref:
 562                     ret_conv = (ret_conv[0], " | 1;")
 563                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 564                     arg_conv = ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)(" + ty_info.var_name + " & ~1);",
 565                     arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 566                     ret_conv = ret_conv, ret_conv_name = "ret_" + ty_info.var_name,
 567                     to_hu_conv = "TODO 3", to_hu_conv_name = None, from_hu_conv = None) # its a pointer, no conv needed
 568             assert False # We should have handled every case by now.