_ 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                 from_hu_conv = None
  51                 if not arr_len.isdigit():
  52                     arg_conv = ty_info.rust_obj + " " + arr_name + "_ref;\n"
  53                     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"
  54                     if (not ty_info.is_ptr or not holds_ref) and ty_info.rust_obj != "LDKu8slice":
  55                         arg_conv = arg_conv + arr_name + "_ref." + ty_info.arr_access + " = MALLOC(" + arr_name + "_ref." + arr_len + ", \"" + ty_info.rust_obj + " Bytes\");\n"
  56                         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) + ";"
  57                     else:
  58                         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) + ";"
  59                         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)
  60                     if ty_info.rust_obj == "LDKTransaction":
  61                         arg_conv = arg_conv + "\n" + arr_name + "_ref.data_is_owned = " + str(holds_ref).lower() + ";"
  62                     ret_conv = (ty_info.rust_obj + " " + arr_name + "_var = ", "")
  63                     ret_conv = (ret_conv[0], ";\nint8_tArray " + arr_name + "_arr = " + self.consts.create_native_arr_call(arr_name + "_var." + arr_len, ty_info) + ";\n")
  64                     (pfx, sfx) = self.consts.set_native_arr_contents(arr_name + "_arr", arr_name + "_var." + arr_len, ty_info)
  65                     ret_conv = (ret_conv[0], ret_conv[1] + pfx + arr_name + "_var." + ty_info.arr_access + sfx + ";")
  66                     if not holds_ref and ty_info.rust_obj != "LDKu8slice":
  67                         ret_conv = (ret_conv[0], ret_conv[1] + "\n" + ty_info.rust_obj.replace("LDK", "") + "_free(" + arr_name + "_var);")
  68                 elif ty_info.rust_obj is not None:
  69                     arg_conv = ty_info.rust_obj + " " + arr_name + "_ref;\n"
  70                     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"
  71                     arg_conv = arg_conv + self.consts.get_native_arr_contents(arr_name, arr_name + "_ref." + ty_info.arr_access, arr_len, ty_info, True) + ";"
  72                     ret_conv = (ret_conv[0], "." + ty_info.arr_access + set_sfx + ";")
  73                     from_hu_conv = ("InternalUtils.check_arr_len(" + arr_name + ", " + arr_len + ")", "")
  74                 else:
  75                     arg_conv = "unsigned char " + arr_name + "_arr[" + arr_len + "];\n"
  76                     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"
  77                     arg_conv = arg_conv + self.consts.get_native_arr_contents(arr_name, arr_name + "_arr", arr_len, ty_info, True) + ";\n"
  78                     arg_conv = arg_conv + "unsigned char (*" + arr_name + "_ref)[" + arr_len + "] = &" + arr_name + "_arr;"
  79                     ret_conv = (ret_conv[0] + "*", set_sfx + ";")
  80                     from_hu_conv = ("InternalUtils.check_arr_len(" + arr_name + ", " + arr_len + ")", "")
  81                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
  82                     arg_conv = arg_conv, arg_conv_name = arr_name + "_ref", arg_conv_cleanup = arg_conv_cleanup,
  83                     ret_conv = ret_conv, ret_conv_name = arr_name + "_arr", to_hu_conv = None, to_hu_conv_name = None,
  84                     from_hu_conv = from_hu_conv)
  85             else:
  86                 assert not arr_len.isdigit() # fixed length arrays not implemented
  87                 assert ty_info.java_ty[len(ty_info.java_ty) - 2:] == "[]"
  88                 if arr_name == "":
  89                     arr_name = "ret"
  90                 conv_name = arr_name + "_conv_" + str(len(ty_info.java_hu_ty))
  91                 idxc = chr(ord('a') + (len(ty_info.java_hu_ty) % 26))
  92                 ty_info.subty.var_name = conv_name
  93                 #XXX: We'd really prefer to only ever set to False, avoiding lots of clone, but need smarter free logic
  94                 #if ty_info.is_ptr or holds_ref:
  95                 #    ty_info.subty.requires_clone = False
  96                 ty_info.subty.requires_clone = not ty_info.is_ptr or not holds_ref
  97                 if not ty_info.subty.is_native_primitive and ty_info.subty.rust_obj == "LDKChannelMonitor":
  98                     # We take a Vec of references to ChannelMonitors as input to ChannelManagerReadArgs, if we clone them,
  99                     # we end up freeing the clones after creating the ChannelManagerReadArgs before calling the read
 100                     # function itself, resulting in a segfault. Thus, we manually check and ensure we don't clone for
 101                     # ChannelMonitors inside of vecs.
 102                     ty_info.subty.requires_clone = False
 103                 subty = self.map_type_with_info(ty_info.subty, False, None, is_free, holds_ref, False)
 104                 arg_conv = ty_info.rust_obj + " " + arr_name + "_constr;\n"
 105                 pf = ""
 106                 if ty_info.is_ptr:
 107                     pf = "\t"
 108                     arg_conv += ty_info.rust_obj + " *" + arr_name + "_ptr = NULL;\n"
 109                     arg_conv += "if (" + self.consts.is_arr_some_check[0] + arr_name + self.consts.is_arr_some_check[1] + ") {\n"
 110                 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"
 111                 arg_conv += pf + "if (" + arr_name + "_constr." + arr_len + " > 0)\n"
 112                 if subty.is_native_primitive:
 113                     szof = subty.c_ty
 114                 else:
 115                     szof = subty.rust_obj
 116                 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"
 117                 arg_conv += pf + "else\n"
 118                 arg_conv += pf + "\t" + arr_name + "_constr." + ty_info.arr_access + " = NULL;\n"
 119                 get_arr = self.consts.get_native_arr_contents(arr_name, "NO_DEST", arr_name + "_constr." + arr_len, ty_info, False)
 120                 if get_arr != None:
 121                     arg_conv += pf + subty.c_ty + "* " + arr_name + "_vals = " + get_arr + ";\n"
 122                 arg_conv += pf + "for (size_t " + idxc + " = 0; " + idxc + " < " + arr_name + "_constr." + arr_len + "; " + idxc + "++) {\n"
 123                 if get_arr != None:
 124                     arg_conv += pf + "\t" + subty.c_ty + " " + conv_name + " = " + arr_name + "_vals[" + idxc + "];"
 125                     if subty.arg_conv is not None:
 126                         arg_conv += "\n\t" + pf + subty.arg_conv.replace("\n", "\n\t" + pf)
 127                 else:
 128                     arg_conv += pf + "\t" + subty.c_ty + " " + conv_name + " = " + self.consts.get_native_arr_elem(arr_name, idxc, ty_info) + ";\n"
 129                     arg_conv += pf + "\t" + subty.arg_conv.replace("\n", "\n\t" + pf)
 130                 arg_conv += "\n\t" + pf + arr_name + "_constr." + ty_info.arr_access + "[" + idxc + "] = " + subty.arg_conv_name + ";\n" + pf + "}"
 131                 if get_arr != None:
 132                     cleanup = self.consts.cleanup_native_arr_ref_contents(arr_name, arr_name + "_vals", arr_name + "_constr." + arr_len, ty_info)
 133                     if cleanup is not None:
 134                         arg_conv += "\n" + pf + cleanup + ";"
 135                 if ty_info.is_ptr:
 136                     arg_conv_name = arr_name + "_ptr"
 137                 else:
 138                     arg_conv_name = arr_name + "_constr"
 139                 arg_conv_cleanup = None
 140                 if ty_info.is_ptr:
 141                     arg_conv_cleanup = "if (" + arr_name + "_ptr != NULL) { FREE(" + arr_name + "_constr." + ty_info.arr_access + "); }"
 142                 if ty_info.is_ptr:
 143                     arg_conv += "\n\t" + arr_name + "_ptr = &" + arr_name + "_constr;\n}"
 144
 145                 if is_nullable:
 146                     ret_conv = (ty_info.rust_obj + " *" + arr_name + "_var_ptr = ", "")
 147                 else:
 148                     ret_conv = (ty_info.rust_obj + " " + arr_name + "_var = ", "")
 149                 if subty.ret_conv is None:
 150                     ret_conv = ("DUMMY", "DUMMY")
 151                 else:
 152                     ret_conv = (ret_conv[0], ";\n" + ty_info.c_ty + " " + arr_name + "_arr = NULL;\n")
 153                     indent = ""
 154                     if is_nullable:
 155                         ret_conv = (ret_conv[0], ret_conv[1] + "if (" + arr_name + " != NULL) {\n")
 156                         ret_conv = (ret_conv[0], ret_conv[1] + "\t" + ty_info.rust_obj + " " + arr_name + "_var = *" + arr_name + "_var_ptr;\n")
 157                         indent = "\t"
 158                     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")
 159                     get_ptr_call = self.consts.get_native_arr_ptr_call(ty_info)
 160                     if get_ptr_call is not None:
 161                         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")
 162                     ret_conv = (ret_conv[0], ret_conv[1] + indent + "for (size_t " + idxc + " = 0; " + idxc + " < " + arr_name + "_var." + arr_len + "; " + idxc + "++) {\n")
 163                     ret_conv = (ret_conv[0], ret_conv[1] + indent + "\t" + subty.ret_conv[0].replace("\n", "\n\t" + indent))
 164                     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")
 165                     if get_ptr_call is not None:
 166                         ret_conv = (ret_conv[0], ret_conv[1] + indent + "\t" + arr_name + "_arr_ptr[" + idxc + "] = " + subty.ret_conv_name + ";\n" + indent + "}\n")
 167                     else:
 168                         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")
 169                     cleanup = self.consts.release_native_arr_ptr_call(ty_info, arr_name + "_arr", arr_name + "_arr_ptr")
 170                     if cleanup is not None:
 171                         ret_conv = (ret_conv[0], ret_conv[1] + indent + cleanup + ";")
 172                     if not holds_ref and not is_nullable:
 173                         # XXX: The commented if's are a bit smarter freeing, but we need to be a nudge smarter still
 174                         # Note that we don't drop the full vec here - we're passing ownership to java (or have cloned) or free'd by now!
 175                         ret_conv = (ret_conv[0], ret_conv[1] + "\n" + indent + "FREE(" + arr_name + "_var." + ty_info.arr_access + ");")
 176                         #if subty.rust_obj is not None and subty.rust_obj in self.opaque_structs:
 177                         #    ret_conv = (ret_conv[0], ret_conv[1] + "\nFREE(" + arr_name + "_var." + ty_info.arr_access + ");")
 178                         #else:
 179                         #    ret_conv = (ret_conv[0], ret_conv[1] + "\n" + ty_info.rust_obj.replace("LDK", "") + "_free(" + arr_name + "_var);")
 180                     if is_nullable:
 181                         ret_conv = (ret_conv[0], ret_conv[1] + "\n}")
 182
 183                 to_hu_conv = None
 184                 to_hu_conv_name = None
 185                 if subty.to_hu_conv is not None:
 186                     to_hu_conv = self.consts.var_decl_statement(ty_info.java_hu_ty, conv_name + "_arr", self.consts.constr_hu_array(ty_info, arr_name + ".length"))
 187                     to_hu_conv += ";\n" + self.consts.for_n_in_range(idxc, "0", arr_name + ".length") + "\n"
 188                     to_hu_conv += "\t" + self.consts.var_decl_statement(subty.java_ty, conv_name, arr_name + "[" + idxc + "]") + ";\n"
 189                     to_hu_conv += "\t" + subty.to_hu_conv.replace("\n", "\n\t") + "\n"
 190                     to_hu_conv += "\t" + conv_name + "_arr[" + idxc + "] = " + subty.to_hu_conv_name + ";\n}"
 191                     to_hu_conv_name = conv_name + "_arr"
 192                 from_hu_conv = None
 193                 if subty.from_hu_conv is not None:
 194                     hu_conv_b = ""
 195                     if subty.from_hu_conv[1] != "":
 196                         iterator = self.consts.for_n_in_arr(conv_name, arr_name, subty)
 197                         hu_conv_b = iterator[0] + subty.from_hu_conv[1] + ";" + iterator[1]
 198                     from_hu_conv = (self.consts.map_hu_array_elems(arr_name, conv_name, ty_info, subty), hu_conv_b)
 199
 200                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 201                     arg_conv = arg_conv, arg_conv_name = arg_conv_name, arg_conv_cleanup = arg_conv_cleanup,
 202                     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)
 203         elif ty_info.java_fn_ty_arg == "Ljava/lang/String;":
 204             assert not is_nullable
 205             if not is_free:
 206                 arg_conv = "LDKStr " + ty_info.var_name + "_conv = " + self.consts.str_ref_to_c_call(ty_info.var_name) + ";"
 207                 arg_conv_name = ty_info.var_name + "_conv"
 208             else:
 209                 arg_conv = "LDKStr dummy = { .chars = NULL, .len = 0, .chars_is_owned = false };"
 210                 arg_conv_name = "dummy"
 211             if ty_info.arr_access is None:
 212                 assert False
 213                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 214                     arg_conv = arg_conv, arg_conv_name = arg_conv_name, arg_conv_cleanup = None,
 215                     ret_conv = ("const char* " + ty_info.var_name + "_str = ",
 216                         ";\njstring " + ty_info.var_name + "_conv = " + self.consts.str_ref_to_native_call(ty_info.var_name + "_str", "strlen(" + ty_info.var_name + "_str)") + ";"),
 217                     ret_conv_name = ty_info.var_name + "_conv",
 218                     to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 219             else:
 220                 free_str = ""
 221                 if not holds_ref:
 222                     free_str = "\nStr_free(" + ty_info.var_name + "_str);"
 223                 to_hu_conv = self.consts.str_to_hu_conv(ty_info.var_name)
 224                 to_hu_conv_name = None
 225                 if to_hu_conv is not None:
 226                     to_hu_conv_name = ty_info.var_name + "_conv"
 227                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 228                     arg_conv = arg_conv, arg_conv_name = arg_conv_name, arg_conv_cleanup = None,
 229                     ret_conv = ("LDKStr " + ty_info.var_name + "_str = ",
 230                         ";\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),
 231                     ret_conv_name = ty_info.var_name + "_conv",
 232                     to_hu_conv=to_hu_conv, to_hu_conv_name=to_hu_conv_name,
 233                     from_hu_conv = self.consts.str_from_hu_conv(ty_info.var_name))
 234         elif ty_info.var_name == "" and not print_void:
 235             # We don't have a parameter name, and want one, just call it arg
 236             if not ty_info.is_native_primitive:
 237                 assert(not is_free or ty_info.rust_obj not in self.opaque_structs)
 238                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 239                     arg_conv = ty_info.rust_obj + " arg_conv = *(" + ty_info.rust_obj + "*)arg;\nFREE((void*)arg);",
 240                     arg_conv_name = "arg_conv", arg_conv_cleanup = None,
 241                     ret_conv = None, ret_conv_name = None, to_hu_conv = "TODO 7", to_hu_conv_name = None, from_hu_conv = None)
 242             else:
 243                 assert(not is_free)
 244                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 245                     arg_conv = None, arg_conv_name = "arg", arg_conv_cleanup = None,
 246                     ret_conv = None, ret_conv_name = None, to_hu_conv = "TODO 8", to_hu_conv_name = None, from_hu_conv = None)
 247         elif ty_info.is_native_primitive:
 248             assert not is_nullable
 249             return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 250                 arg_conv = None, arg_conv_name = ty_info.var_name, arg_conv_cleanup = None,
 251                 ret_conv = None, ret_conv_name = None, to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 252         else:
 253             if ty_info.var_name == "":
 254                 ty_info.var_name = "ret"
 255
 256             if ty_info.rust_obj in self.opaque_structs:
 257                 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))
 258                 opaque_arg_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv;\n"
 259                 opaque_arg_conv = opaque_arg_conv + ty_info.var_name + "_conv.inner = (void*)(" + ty_info.var_name + " & (~1));\n"
 260                 if ty_info.is_ptr and holds_ref:
 261                     opaque_arg_conv += ty_info.var_name + "_conv.is_owned = false;\n"
 262                 else:
 263                     opaque_arg_conv += ty_info.var_name + "_conv.is_owned = (" + ty_info.var_name + " & 1) || (" + ty_info.var_name + " == 0);\n"
 264                 opaque_arg_conv += "CHECK_INNER_FIELD_ACCESS_OR_NULL(" + ty_info.var_name + "_conv);"
 265                 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:
 266                     if (ty_info.rust_obj.replace("LDK", "") + "_clone") in self.clone_fns:
 267                         # 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.
 268                         # arg_conv is used when converting a function argument from java normally (with holds_ref set),
 269                         # and when converting a java value being returned from a trait method (with holds_ref unset).
 270                         # In the second case, we need to clone before returning to C (as once we return the GC can free the object),
 271                         # whereas in the first we prefer to clone in C to avoid additional Java code as much as possible.
 272                         if holds_ref:
 273                             opaque_arg_conv = opaque_arg_conv + "\n" + ty_info.var_name + "_conv = " + ty_info.rust_obj.replace("LDK", "") + "_clone(&" + ty_info.var_name + "_conv);"
 274                             from_hu_conv = (from_hu_conv[0], "")
 275                         else:
 276                             from_hu_conv = (ty_info.var_name + " == null ? 0 : " + ty_info.var_name + ".clone_ptr()", "")
 277                     elif ty_info.passed_as_ptr:
 278                         opaque_arg_conv = opaque_arg_conv + "\n// Warning: we need a move here but no clone is available for " + ty_info.rust_obj
 279                         # TODO: Once we support features cloning (which just isn't in C yet), we can make this a compile error instead!
 280                         from_hu_conv = (from_hu_conv[0], from_hu_conv[1] + ";\n" +
 281                             "// Due to rust's strict-ownership memory model, in some cases we need to \"move\"\n" +
 282                             "// an object to pass exclusive ownership to the function being called.\n" +
 283                             "// In most cases, we avoid this being visible in GC'd languages by cloning the object\n" +
 284                             "// at the FFI layer, creating a new object which Rust can claim ownership of\n" +
 285                             "// However, in some cases (eg here), there is no way to clone an object, and thus\n" +
 286                             "// we actually have to pass full ownership to Rust.\n" +
 287                             "// 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))
 288
 289                 opaque_ret_conv_suf = ";\n"
 290                 opaque_ret_conv_suf += "uint64_t " + ty_info.var_name + "_ref = 0;\n"
 291                 indent = ""
 292                 if is_nullable:
 293                     opaque_ret_conv_suf += "if ((uint64_t)" + ty_info.var_name + "_var.inner > 4096) {\n"
 294                     indent = "\t"
 295                 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
 296                     opaque_ret_conv_suf += indent + ty_info.var_name + "_var = " + ty_info.rust_obj.replace("LDK", "") + "_clone(" + ty_info.var_name + ");\n"
 297                 elif not holds_ref and ty_info.is_ptr:
 298                     opaque_ret_conv_suf += indent + "// Warning: we may need a move here but no clone is available for " + ty_info.rust_obj + "\n"
 299
 300                 opaque_ret_conv_suf += indent + "CHECK((((uint64_t)" + ty_info.var_name + "_var.inner) & 1) == 0); // We rely on a free low bit, malloc guarantees this.\n"
 301                 opaque_ret_conv_suf += indent + "CHECK((((uint64_t)&" + ty_info.var_name + "_var) & 1) == 0); // We rely on a free low bit, pointer alignment guarantees this.\n"
 302                 opaque_ret_conv_suf += "CHECK_INNER_FIELD_ACCESS_OR_NULL(" + ty_info.var_name + "_var);\n"
 303                 if holds_ref:
 304                     opaque_ret_conv_suf += indent + ty_info.var_name + "_ref = (uint64_t)" + ty_info.var_name + "_var.inner & ~1;"
 305                 else:
 306                     opaque_ret_conv_suf += indent + ty_info.var_name + "_ref = (uint64_t)" + ty_info.var_name + "_var.inner;\n"
 307                     opaque_ret_conv_suf += indent + "if (" + ty_info.var_name + "_var.is_owned) {\n"
 308                     opaque_ret_conv_suf += indent + "\t" + ty_info.var_name + "_ref |= 1;\n"
 309                     opaque_ret_conv_suf += indent + "}"
 310                 if is_nullable:
 311                     opaque_ret_conv_suf += "\n}"
 312
 313                 to_hu_conv_sfx = ""
 314                 if not ty_info.is_ptr or holds_ref:
 315                     to_hu_conv_sfx = "\n" + self.consts.add_ref(ty_info.var_name + "_hu_conv", "this") + ";"
 316                 if ty_info.is_ptr:
 317                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 318                         arg_conv = opaque_arg_conv, arg_conv_name = "&" + ty_info.var_name + "_conv", arg_conv_cleanup = None,
 319                         ret_conv = (ty_info.rust_obj + " " + ty_info.var_name + "_var = *", opaque_ret_conv_suf),
 320                         ret_conv_name = ty_info.var_name + "_ref",
 321                         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,
 322                         to_hu_conv_name = ty_info.var_name + "_hu_conv",
 323                         from_hu_conv = from_hu_conv)
 324                 else:
 325                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 326                         arg_conv = opaque_arg_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 327                         ret_conv = (ty_info.rust_obj + " " + ty_info.var_name + "_var = ", opaque_ret_conv_suf),
 328                         ret_conv_name = ty_info.var_name + "_ref",
 329                         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,
 330                         to_hu_conv_name = ty_info.var_name + "_hu_conv",
 331                         from_hu_conv = from_hu_conv)
 332
 333             assert not is_nullable
 334             if not ty_info.is_ptr:
 335                 if ty_info.rust_obj in self.unitary_enums:
 336                     (ret_pfx, ret_sfx) = self.consts.c_unitary_enum_to_native_call(ty_info)
 337                     (arg_pfx, arg_sfx) = self.consts.native_unitary_enum_to_c_call(ty_info)
 338                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 339                         arg_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv = " + arg_pfx + ty_info.var_name + arg_sfx + ";",
 340                         arg_conv_name = ty_info.var_name + "_conv",
 341                         arg_conv_cleanup = None,
 342                         ret_conv = (ty_info.c_ty + " " + ty_info.var_name + "_conv = " + ret_pfx, ret_sfx + ";"),
 343                         ret_conv_name = ty_info.var_name + "_conv", to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 344                 base_conv = "void* " + ty_info.var_name + "_ptr = (void*)(((uint64_t)" + ty_info.var_name + ") & ~1);\n"
 345                 base_conv += "CHECK_ACCESS(" + ty_info.var_name + "_ptr);\n"
 346                 base_conv += ty_info.rust_obj + " " + ty_info.var_name + "_conv = *(" + ty_info.rust_obj + "*)(" + ty_info.var_name + "_ptr);"
 347                 from_hu_conv = None
 348                 if ty_info.rust_obj in self.trait_structs:
 349                     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 = ", ";")
 350                     if holds_ref:
 351                         if (ty_info.rust_obj.replace("LDK", "") + "_clone") in self.clone_fns:
 352                             ret_conv = (ret_conv[0] + ty_info.rust_obj.replace("LDK", "") + "_clone(&", ");")
 353                         else:
 354                             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")
 355                             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)"))
 356                     if not is_free:
 357                         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
 358                         if needs_full_clone and (ty_info.rust_obj.replace("LDK", "") + "_clone") in self.clone_fns:
 359                             # arg_conv is used when converting a function argument from java normally (with holds_ref set),
 360                             # and when converting a java value being returned from a trait method (with holds_ref unset).
 361                             # In the second case, we need to clone before returning to C (as once we return the GC can free the object),
 362                             # whereas in the first we prefer to clone in C to avoid additional Java code as much as possible.
 363                             if holds_ref:
 364                                 base_conv += "\n" + ty_info.var_name + "_conv = " + ty_info.rust_obj.replace("LDK", "") + "_clone(&" + ty_info.var_name + "_conv);"
 365                             else:
 366                                 from_hu_conv = (ty_info.var_name + " == null ? 0 : " + ty_info.var_name + ".clone_ptr()", "")
 367                                 base_conv += "\n" + "FREE((void*)" + ty_info.var_name + ");"
 368                         else:
 369                             base_conv = base_conv + self.consts.trait_struct_inc_refcnt(ty_info)
 370                             if needs_full_clone:
 371                                 base_conv = base_conv + "// Warning: we may need a move here but no clone is available for " + ty_info.rust_obj + "\n"
 372                     else:
 373                         base_conv = base_conv + "\n" + "FREE((void*)" + ty_info.var_name + ");"
 374                     if from_hu_conv is None:
 375                         from_hu_conv = (ty_info.var_name + " == null ? 0 : " + self.consts.get_ptr(ty_info.var_name), "")
 376                     from_hu_conv = (from_hu_conv[0], self.consts.add_ref("this", ty_info.var_name))
 377                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 378                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 379                         ret_conv = ret_conv, ret_conv_name = "(uint64_t)" + ty_info.var_name + "_ret",
 380                         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") + ";",
 381                         to_hu_conv_name = "ret_hu_conv", from_hu_conv = from_hu_conv)
 382                 needs_full_clone = not is_free and (not ty_info.is_ptr or ty_info.requires_clone == True) and ty_info.requires_clone != False
 383                 if needs_full_clone:
 384                     if "res" in ty_info.var_name: # XXX: This is a stupid hack
 385                         needs_full_clone = False
 386                     if needs_full_clone and (ty_info.rust_obj.replace("LDK", "") + "_clone") in self.clone_fns:
 387                         # arg_conv is used when converting a function argument from java normally (with holds_ref set),
 388                         # and when converting a java value being returned from a trait method (with holds_ref unset).
 389                         # In the second case, we need to clone before returning to C (as once we return the GC can free the object),
 390                         # whereas in the first we prefer to clone in C to avoid additional Java code as much as possible.
 391                         if holds_ref:
 392                             base_conv += "\n" + ty_info.var_name + "_conv = " + ty_info.rust_obj.replace("LDK", "") + "_clone((" + ty_info.rust_obj + "*)(((uint64_t)" + ty_info.var_name + ") & ~1));"
 393                         else:
 394                             from_hu_conv = (ty_info.var_name + " == null ? 0 : " + ty_info.var_name + ".clone_ptr()", "")
 395                             base_conv += "\n" + "FREE((void*)" + ty_info.var_name + ");"
 396                     elif needs_full_clone:
 397                         base_conv = base_conv + "\n// Warning: we may need a move here but no clone is available for " + ty_info.rust_obj
 398                 if not needs_full_clone and ty_info.rust_obj != "LDKu8slice" and (not holds_ref or is_free):
 399                     # Don't bother free'ing slices passed in - Rust doesn't auto-free the
 400                     # underlying unlike Vecs, and it gives Java more freedom.
 401                     base_conv = base_conv + "\nFREE((void*)" + ty_info.var_name + ");"
 402                 if ty_info.rust_obj in self.complex_enums:
 403                     to_hu_conv_sfx = ""
 404                     if needs_full_clone and (ty_info.rust_obj.replace("LDK", "") + "_clone") not in self.clone_fns:
 405                         # We really need a full clone here, but for now we just implement
 406                         # a manual clone explicitly for Option<Trait>s
 407                         if ty_info.contains_trait:
 408                             assert ty_info.rust_obj.startswith("LDKCOption") # We don't support contained traits for anything else yet
 409                             optional_ty = ty_info.rust_obj[11:-1]
 410                             assert "LDK" + optional_ty in self.trait_structs # We don't support contained traits for anything else yet
 411                             to_hu_conv_sfx = self.consts.add_ref("this", ty_info.var_name)
 412                             base_conv += "\nif (" + ty_info.var_name + "_conv.tag == " + ty_info.rust_obj + "_Some) {"
 413                             base_conv += "\n\t// Manually implement clone for Java trait instances"
 414                             optional_ty_info = self.java_c_types("LDK" + optional_ty + " " + ty_info.var_name, None)
 415                             base_conv += self.consts.trait_struct_inc_refcnt(optional_ty_info).\
 416                                 replace("\n", "\n\t").replace(ty_info.var_name + "_conv", ty_info.var_name + "_conv.some")
 417                             base_conv += "\n}"
 418                     ret_conv = ("uint64_t " + ty_info.var_name + "_ref = ((uint64_t)&", ") | 1;")
 419                     if not holds_ref:
 420                         ret_conv = (ty_info.rust_obj + " *" + ty_info.var_name + "_copy = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n", "")
 421                         ret_conv = (ret_conv[0] + "*" + ty_info.var_name + "_copy = ", "")
 422                         ret_conv = (ret_conv[0], ";\nuint64_t " + ty_info.var_name + "_ref = (uint64_t)" + ty_info.var_name + "_copy;")
 423                     if from_hu_conv is None:
 424                         from_hu_conv = (self.consts.get_ptr(ty_info.var_name), "")
 425                     from_hu_conv = (from_hu_conv[0], to_hu_conv_sfx)
 426                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 427                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 428                         ret_conv = ret_conv, ret_conv_name = ty_info.var_name + "_ref",
 429                         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") + ";",
 430                         to_hu_conv_name = ty_info.var_name + "_hu_conv", from_hu_conv = from_hu_conv)
 431                 if ty_info.rust_obj in self.result_types:
 432                     if holds_ref:
 433                         # If we're trying to return a ref, we have to clone.
 434                         # We just blindly assume its implemented and let the compiler fail if its not.
 435                         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 = ", ";")
 436                         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);")
 437                     else:
 438                         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 = ", ";")
 439                     if from_hu_conv is None:
 440                         from_hu_conv = (ty_info.var_name + " != null ? " + self.consts.get_ptr(ty_info.var_name) + " : 0", "")
 441                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 442                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 443                         ret_conv = ret_conv, ret_conv_name = "(uint64_t)" + ty_info.var_name + "_conv",
 444                         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 + ")") + ";",
 445                         to_hu_conv_name = ty_info.var_name + "_hu_conv", from_hu_conv = from_hu_conv)
 446                 if ty_info.rust_obj in self.tuple_types:
 447                     ret_conv_name = "((uint64_t)" + ty_info.var_name + "_conv)"
 448                     if holds_ref:
 449                         # If we're trying to return a ref, we have to clone.
 450                         if (ty_info.rust_obj.replace("LDK", "") + "_clone") not in self.clone_fns:
 451                             ret_conv = (ty_info.rust_obj + "* " + ty_info.var_name + "_conv = &", "")
 452                             ret_conv = (ret_conv[0], ";\n// Warning: we really need to clone here, but no clone is available for " + ty_info.rust_obj)
 453                             ret_conv_name += " | 1"
 454                         else:
 455                             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 = ", ";")
 456                             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);")
 457                     else:
 458                         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 = ", ";")
 459                     if not ty_info.is_ptr or holds_ref:
 460                         to_hu_conv_sfx = "\n" + self.consts.add_ref(ty_info.var_name + "_hu_conv", "this") + ";"
 461                     else:
 462                         to_hu_conv_sfx = ""
 463                     if from_hu_conv is None:
 464                         from_hu_conv = (ty_info.var_name + " != null ? " + self.consts.get_ptr(ty_info.var_name) + " : 0", "")
 465                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 466                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 467                         ret_conv = ret_conv, ret_conv_name = ret_conv_name,
 468                         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,
 469                         to_hu_conv_name = ty_info.var_name + "_hu_conv", from_hu_conv = from_hu_conv)
 470
 471                 # The manually-defined types - TxOut and u5
 472                 if ty_info.rust_obj == "LDKu5":
 473                     assert from_hu_conv is None
 474                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 475                         arg_conv = "", arg_conv_name = "(LDKu5){ ._0 = " + ty_info.var_name + " }", arg_conv_cleanup = None,
 476                         ret_conv = ("uint8_t " + ty_info.var_name + "_val = ", "._0;"), ret_conv_name = ty_info.var_name + "_val",
 477                         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 + ")") + ";",
 478                         to_hu_conv_name = ty_info.var_name + "_conv", from_hu_conv = (ty_info.var_name + ".getVal()", ""))
 479
 480                 assert ty_info.rust_obj == "LDKTxOut"
 481                 if not ty_info.is_ptr and not holds_ref:
 482                     ret_conv = ("LDKTxOut* " + ty_info.var_name + "_ref = MALLOC(sizeof(LDKTxOut), \"LDKTxOut\");\n*" + ty_info.var_name + "_ref = ", ";")
 483                 else:
 484                     ret_conv = ("uint64_t " + ty_info.var_name + "_ref = ((uint64_t)&", ") | 1;")
 485                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 486                     arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 487                     ret_conv = ret_conv, ret_conv_name = "(uint64_t)" + ty_info.var_name + "_ref",
 488                     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 + ")") + ";",
 489                     to_hu_conv_name = ty_info.var_name + "_conv", from_hu_conv = (self.consts.get_ptr(ty_info.var_name), ""))
 490             elif ty_info.is_ptr:
 491                 assert(not is_free)
 492                 if ty_info.rust_obj in self.complex_enums:
 493                     ret_conv = ("uint64_t ret_" + ty_info.var_name + " = (uint64_t)", " | 1; // Warning: We should clone here!")
 494                     from_hu_sfx = self.consts.add_ref("this", ty_info.var_name)
 495                     if ty_info.rust_obj.replace("LDK", "") + "_clone" in self.clone_fns:
 496                         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"
 497                         ret_conv_pfx += "*ret_" + ty_info.var_name + " = " + ty_info.rust_obj.replace("LDK", "") + "_clone("
 498                         ret_conv = (ret_conv_pfx, ");")
 499                         from_hu_sfx = ""
 500                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 501                         arg_conv = ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)" + ty_info.var_name + ";",
 502                         arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 503                         ret_conv = ret_conv, ret_conv_name = "(uint64_t)ret_" + ty_info.var_name,
 504                         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 + ")") + ";",
 505                         to_hu_conv_name = ty_info.var_name + "_hu_conv",
 506                         from_hu_conv = (ty_info.var_name + " == null ? 0 : " + self.consts.get_ptr(ty_info.var_name) + " & ~1", from_hu_sfx))
 507                 elif ty_info.rust_obj in self.trait_structs:
 508                     if ty_info.nonnull_ptr:
 509                         arg_conv = "void* " + ty_info.var_name + "_ptr = (void*)(((uint64_t)" + ty_info.var_name + ") & ~1);\n"
 510                         arg_conv += "if (!(" + ty_info.var_name + " & 1)) { CHECK_ACCESS(" + ty_info.var_name + "_ptr); }\n"
 511                         arg_conv += ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)" + ty_info.var_name + "_ptr;"
 512                         arg_conv_name = ty_info.var_name + "_conv"
 513                     else:
 514                         # We map Option<Trait> as *mut Trait, which we can differentiate from &Trait by the NONNULL_PTR annotation.
 515                         # We handle the Option<Trait> case here.
 516                         arg_conv = ty_info.rust_obj + " *" + ty_info.var_name + "_conv_ptr = NULL;\n"
 517                         arg_conv += "if (" + ty_info.var_name + " != 0) {\n"
 518                         arg_conv += "\t" + ty_info.rust_obj + " " + ty_info.var_name + "_conv;\n"
 519                         arg_conv += "void* " + ty_info.var_name + "_ptr = (void*)(((uint64_t)" + ty_info.var_name + ") & ~1);\n"
 520                         arg_conv += "CHECK_ACCESS(" + ty_info.var_name + "_ptr);\n"
 521                         arg_conv += "\t" + ty_info.var_name + "_conv = *(" + ty_info.rust_obj + "*)" + ty_info.var_name + "_ptr;"
 522                         arg_conv += self.consts.trait_struct_inc_refcnt(ty_info).replace("\n", "\n\t")
 523                         arg_conv += "\n\t" + ty_info.var_name + "_conv_ptr = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n"
 524                         arg_conv += "\t*" + ty_info.var_name + "_conv_ptr = " + ty_info.var_name + "_conv;\n"
 525                         arg_conv += "}"
 526                         arg_conv_name = ty_info.var_name + "_conv_ptr"
 527                     if ty_info.rust_obj.replace("LDK", "") + "_clone" in self.clone_fns:
 528                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 529                             arg_conv = arg_conv, arg_conv_name = arg_conv_name, arg_conv_cleanup = None,
 530                             ret_conv = (ty_info.rust_obj + " *" + ty_info.var_name + "_clone = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n" +
 531                                 "*" + ty_info.var_name + "_clone = " + ty_info.rust_obj.replace("LDK", "") + "_clone(", ");"),
 532                             ret_conv_name = "(uint64_t)" + ty_info.var_name + "_clone",
 533                             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") + ";",
 534                             to_hu_conv_name = "ret_hu_conv",
 535                             from_hu_conv = (ty_info.var_name + " == null ? 0 : " + self.consts.get_ptr(ty_info.var_name), ""))
 536                     else:
 537                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 538                             arg_conv = arg_conv, arg_conv_name = arg_conv_name, arg_conv_cleanup = None,
 539                             ret_conv = ("// WARNING: This object doesn't live past this scope, needs clone!\nuint64_t ret_" + ty_info.var_name + " = ((uint64_t)", ") | 1;"),
 540                             ret_conv_name = "ret_" + ty_info.var_name,
 541                             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") + ";",
 542                             to_hu_conv_name = "ret_hu_conv",
 543                             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)))
 544                 ret_conv = ("uint64_t ret_" + ty_info.var_name + " = (uint64_t)", ";")
 545                 if holds_ref:
 546                     ret_conv = (ret_conv[0], " | 1;")
 547                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 548                     arg_conv = ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)(" + ty_info.var_name + " & ~1);",
 549                     arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 550                     ret_conv = ret_conv, ret_conv_name = "ret_" + ty_info.var_name,
 551                     to_hu_conv = "TODO 3", to_hu_conv_name = None, from_hu_conv = None) # its a pointer, no conv needed
 552             assert False # We should have handled every case by now.