_ 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, None, arr_name)
  68                     to_hu_conv = self.consts.primitive_arr_to_hu(ty_info, 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, arr_len, arr_name)
  75                     to_hu_conv = self.consts.primitive_arr_to_hu(ty_info, 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, arr_len, arr_name)
  83                     to_hu_conv = self.consts.primitive_arr_to_hu(ty_info, 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                 if subty.to_hu_conv is not None:
 191                     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"
 192                     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"))
 193                     to_hu_conv += ";\n"
 194                     pfx = ""
 195                     if is_nullable:
 196                         to_hu_conv += "if (" + arr_name + " != null) {\n"
 197                         pfx = "\t"
 198                     to_hu_conv += pfx + self.consts.for_n_in_range(idxc, "0", conv_name + "_len") + "\n"
 199
 200                     to_hu_conv += pfx + "\t" + self.consts.var_decl_statement(subty.java_ty, conv_name, self.consts.get_java_arr_elem(subty, arr_name, idxc)) + ";\n"
 201                     to_hu_conv += pfx + "\t" + subty.to_hu_conv.replace("\n", "\n\t" + pfx) + "\n"
 202                     to_hu_conv += pfx + "\t" + conv_name + "_arr[" + idxc + "] = " + subty.to_hu_conv_name + ";\n"
 203                     to_hu_conv += pfx + "}"
 204                     if is_nullable:
 205                         to_hu_conv += "\n}"
 206                     cleanup = self.consts.cleanup_converted_native_array(ty_info, arr_name)
 207                     if cleanup is not None:
 208                         to_hu_conv += "\n" + cleanup
 209                     to_hu_conv_name = conv_name + "_arr"
 210                 else:
 211                     to_hu_conv = self.consts.primitive_arr_to_hu(ty_info, None, arr_name, arr_name + "_conv")
 212                     if to_hu_conv is not None:
 213                         to_hu_conv_name = arr_name + "_conv"
 214                     else:
 215                         to_hu_conv_name = None
 216                 from_hu_conv = self.consts.primitive_arr_from_hu(ty_info, None, arr_name)
 217                 if subty.from_hu_conv is not None:
 218                     hu_conv_b = ""
 219                     if subty.from_hu_conv[1] != "":
 220                         iterator = self.consts.for_n_in_arr(conv_name, arr_name, subty)
 221                         if is_nullable:
 222                             hu_conv_b = "if (" + arr_name + " != null) { " + iterator[0] + subty.from_hu_conv[1] + ";" + iterator[1] + " }"
 223                         else:
 224                             hu_conv_b = iterator[0] + subty.from_hu_conv[1] + ";" + iterator[1]
 225                     if from_hu_conv is not None:
 226                         arr_conv = self.consts.primitive_arr_from_hu(ty_info, None, self.consts.map_hu_array_elems(arr_name, conv_name, ty_info, subty))
 227                         assert arr_conv[1] == ""
 228                         from_hu_conv = (arr_conv[0], hu_conv_b)
 229                     else:
 230                         from_hu_conv = (self.consts.map_hu_array_elems(arr_name, conv_name, ty_info, subty), hu_conv_b)
 231
 232                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 233                     arg_conv = arg_conv, arg_conv_name = arg_conv_name, arg_conv_cleanup = arg_conv_cleanup,
 234                     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)
 235         elif ty_info.java_fn_ty_arg == "Ljava/lang/String;":
 236             assert not is_nullable
 237             if not is_free:
 238                 arg_conv = "LDKStr " + ty_info.var_name + "_conv = " + self.consts.str_ref_to_c_call(ty_info.var_name) + ";"
 239                 arg_conv_name = ty_info.var_name + "_conv"
 240             else:
 241                 arg_conv = "LDKStr dummy = { .chars = NULL, .len = 0, .chars_is_owned = false };"
 242                 arg_conv_name = "dummy"
 243             if ty_info.arr_access is None:
 244                 assert False
 245                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 246                     arg_conv = arg_conv, arg_conv_name = arg_conv_name, arg_conv_cleanup = None,
 247                     ret_conv = ("const char* " + ty_info.var_name + "_str = ",
 248                         ";\njstring " + ty_info.var_name + "_conv = " + self.consts.str_ref_to_native_call(ty_info.var_name + "_str", "strlen(" + ty_info.var_name + "_str)") + ";"),
 249                     ret_conv_name = ty_info.var_name + "_conv",
 250                     to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 251             else:
 252                 free_str = ""
 253                 if not holds_ref:
 254                     free_str = "\nStr_free(" + ty_info.var_name + "_str);"
 255                 to_hu_conv = self.consts.str_to_hu_conv(ty_info.var_name)
 256                 to_hu_conv_name = None
 257                 if to_hu_conv is not None:
 258                     to_hu_conv_name = ty_info.var_name + "_conv"
 259                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 260                     arg_conv = arg_conv, arg_conv_name = arg_conv_name, arg_conv_cleanup = None,
 261                     ret_conv = ("LDKStr " + ty_info.var_name + "_str = ",
 262                         ";\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),
 263                     ret_conv_name = ty_info.var_name + "_conv",
 264                     to_hu_conv=to_hu_conv, to_hu_conv_name=to_hu_conv_name,
 265                     from_hu_conv = self.consts.str_from_hu_conv(ty_info.var_name))
 266         elif ty_info.var_name == "" and not print_void:
 267             # We don't have a parameter name, and want one, just call it arg
 268             if not ty_info.is_native_primitive:
 269                 assert(not is_free or ty_info.rust_obj not in self.opaque_structs)
 270                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 271                     arg_conv = ty_info.rust_obj + " arg_conv = *(" + ty_info.rust_obj + "*)untag_ptr(arg);\nFREE(untag_ptr(arg));",
 272                     arg_conv_name = "arg_conv", arg_conv_cleanup = None,
 273                     ret_conv = None, ret_conv_name = None, to_hu_conv = "TODO 7", to_hu_conv_name = None, from_hu_conv = None)
 274             else:
 275                 assert(not is_free)
 276                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 277                     arg_conv = None, arg_conv_name = "arg", arg_conv_cleanup = None,
 278                     ret_conv = None, ret_conv_name = None, to_hu_conv = "TODO 8", to_hu_conv_name = None, from_hu_conv = None)
 279         elif ty_info.is_native_primitive and ty_info.c_ty != "void":
 280             assert not is_nullable
 281             return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 282                 arg_conv = None, arg_conv_name =  ty_info.var_name, arg_conv_cleanup = None,
 283                 ret_conv = (ty_info.c_ty + " " + ty_info.var_name + "_conv = ", ";"), ret_conv_name = ty_info.var_name + "_conv",
 284                 to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 285         elif ty_info.c_ty == "void":
 286             assert ty_info.is_native_primitive
 287             assert not is_nullable
 288             return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 289                 arg_conv = None, arg_conv_name =  ty_info.var_name, arg_conv_cleanup = None,
 290                 ret_conv = None, ret_conv_name = ty_info.var_name,
 291                 to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 292         else:
 293             if ty_info.var_name == "":
 294                 ty_info.var_name = "ret"
 295
 296             if ty_info.rust_obj in self.opaque_structs:
 297                 from_hu_conv = (ty_info.var_name + " == null ? " + self.consts.native_zero_ptr + " : " + self.consts.get_ptr(ty_info.var_name), self.consts.add_ref("this", ty_info.var_name))
 298                 opaque_arg_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv;\n"
 299                 opaque_arg_conv = opaque_arg_conv + ty_info.var_name + "_conv.inner = untag_ptr(" + ty_info.var_name + ");\n"
 300                 opaque_arg_conv += ty_info.var_name + "_conv.is_owned = ptr_is_owned(" + ty_info.var_name + ");\n"
 301                 opaque_arg_conv += "CHECK_INNER_FIELD_ACCESS_OR_NULL(" + ty_info.var_name + "_conv);"
 302
 303                 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:
 304                     if (ty_info.rust_obj.replace("LDK", "") + "_clone") in self.clone_fns:
 305                         # 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.
 306                         # arg_conv is used when converting a function argument from java normally (with holds_ref set),
 307                         # and when converting a java value being returned from a trait method (with holds_ref unset).
 308                         # In the second case, we need to clone before returning to C (as once we return the GC can free the object),
 309                         # whereas in the first we prefer to clone in C to avoid additional Java code as much as possible.
 310                         if holds_ref:
 311                             opaque_arg_conv += "\n" + ty_info.var_name + "_conv = " + ty_info.rust_obj.replace("LDK", "") + "_clone(&" + ty_info.var_name + "_conv);"
 312                         else:
 313                             from_hu_conv = (ty_info.var_name + " == null ? " + self.consts.native_zero_ptr + " : " + ty_info.var_name + ".clone_ptr()", "")
 314                     elif ty_info.passed_as_ptr:
 315                         opaque_arg_conv += "\n// WARNING: we need a move here but no clone is available for " + ty_info.rust_obj + "\n"
 316                         # TODO: Once we support features cloning (which just isn't in C yet), we can make this a compile error instead!
 317                         from_hu_conv = (from_hu_conv[0], from_hu_conv[1] + ";\n" +
 318                             "// Due to rust's strict-ownership memory model, in some cases we need to \"move\"\n" +
 319                             "// an object to pass exclusive ownership to the function being called.\n" +
 320                             "// In most cases, we avoid this being visible in GC'd languages by cloning the object\n" +
 321                             "// at the FFI layer, creating a new object which Rust can claim ownership of\n" +
 322                             "// However, in some cases (eg here), there is no way to clone an object, and thus\n" +
 323                             "// we actually have to pass full ownership to Rust.\n" +
 324                             "// 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))
 325                 elif not is_free:
 326                     opaque_arg_conv += "\n" + ty_info.var_name + "_conv.is_owned = false;"
 327
 328                 opaque_ret_conv_suf = ";\n"
 329                 opaque_ret_conv_suf += self.consts.ptr_c_ty + " " + ty_info.var_name + "_ref = 0;\n"
 330                 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
 331                     opaque_ret_conv_suf += ty_info.var_name + "_var = " + ty_info.rust_obj.replace("LDK", "") + "_clone(&" + ty_info.var_name + "_var);\n"
 332                 elif not holds_ref and ty_info.is_ptr:
 333                     opaque_ret_conv_suf += "// WARNING: we may need a move here but no clone is available for " + ty_info.rust_obj + "\n"
 334
 335                 opaque_ret_conv_suf += "CHECK_INNER_FIELD_ACCESS_OR_NULL(" + ty_info.var_name + "_var);\n"
 336                 if holds_ref:
 337                     opaque_ret_conv_suf += ty_info.var_name + "_ref = tag_ptr(" + ty_info.var_name + "_var.inner, false);"
 338                 else:
 339                     opaque_ret_conv_suf += ty_info.var_name + "_ref = tag_ptr(" + ty_info.var_name + "_var.inner, " + ty_info.var_name + "_var.is_owned);"
 340
 341                 to_hu_conv_sfx = ""
 342                 if not ty_info.is_ptr or holds_ref:
 343                     to_hu_conv_sfx = "\n" + self.consts.add_ref(ty_info.var_name + "_hu_conv", "this") + ";"
 344                 qualified_hu_ty = self.consts.fully_qualified_hu_ty_path(ty_info)
 345                 if ty_info.is_ptr:
 346                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 347                         arg_conv = opaque_arg_conv, arg_conv_name = "&" + ty_info.var_name + "_conv", arg_conv_cleanup = None,
 348                         ret_conv = (ty_info.rust_obj + " " + ty_info.var_name + "_var = *", opaque_ret_conv_suf),
 349                         ret_conv_name = ty_info.var_name + "_ref",
 350                         to_hu_conv = self.consts.to_hu_conv_templates['ptr'].replace('{human_type}', qualified_hu_ty).replace('{var_name}', ty_info.var_name) + to_hu_conv_sfx,
 351                         to_hu_conv_name = ty_info.var_name + "_hu_conv",
 352                         from_hu_conv = from_hu_conv)
 353                 else:
 354                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 355                         arg_conv = opaque_arg_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 356                         ret_conv = (ty_info.rust_obj + " " + ty_info.var_name + "_var = ", opaque_ret_conv_suf),
 357                         ret_conv_name = ty_info.var_name + "_ref",
 358                         to_hu_conv = self.consts.to_hu_conv_templates['default'].replace('{human_type}', qualified_hu_ty).replace('{var_name}', ty_info.var_name) + to_hu_conv_sfx,
 359                         to_hu_conv_name = ty_info.var_name + "_hu_conv",
 360                         from_hu_conv = from_hu_conv)
 361
 362             assert not is_nullable
 363             if not ty_info.is_ptr:
 364                 if ty_info.rust_obj in self.unitary_enums:
 365                     (ret_pfx, ret_sfx) = self.consts.c_unitary_enum_to_native_call(ty_info)
 366                     (arg_pfx, arg_sfx) = self.consts.native_unitary_enum_to_c_call(ty_info)
 367                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 368                         arg_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv = " + arg_pfx + ty_info.var_name + arg_sfx + ";",
 369                         arg_conv_name = ty_info.var_name + "_conv",
 370                         arg_conv_cleanup = None,
 371                         ret_conv = (ty_info.c_ty + " " + ty_info.var_name + "_conv = " + ret_pfx, ret_sfx + ";"),
 372                         ret_conv_name = ty_info.var_name + "_conv", to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 373                 base_conv = "void* " + ty_info.var_name + "_ptr = untag_ptr(" + ty_info.var_name + ");\n"
 374                 base_conv += "CHECK_ACCESS(" + ty_info.var_name + "_ptr);\n"
 375                 base_conv += ty_info.rust_obj + " " + ty_info.var_name + "_conv = *(" + ty_info.rust_obj + "*)(" + ty_info.var_name + "_ptr);"
 376                 from_hu_conv = None
 377                 if ty_info.rust_obj in self.trait_structs:
 378                     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 = ", ";")
 379                     if holds_ref:
 380                         if (ty_info.rust_obj.replace("LDK", "") + "_clone") in self.clone_fns:
 381                             ret_conv = (ret_conv[0] + ty_info.rust_obj.replace("LDK", "") + "_clone(&", ");")
 382                         else:
 383                             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")
 384                             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)"))
 385                     if not is_free:
 386                         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
 387                         if needs_full_clone and (ty_info.rust_obj.replace("LDK", "") + "_clone") in self.clone_fns:
 388                             # arg_conv is used when converting a function argument from java normally (with holds_ref set),
 389                             # and when converting a java value being returned from a trait method (with holds_ref unset).
 390                             # In the second case, we need to clone before returning to C (as once we return the GC can free the object),
 391                             # whereas in the first we prefer to clone in C to avoid additional Java code as much as possible.
 392                             if holds_ref:
 393                                 base_conv += "\n" + ty_info.var_name + "_conv = " + ty_info.rust_obj.replace("LDK", "") + "_clone(&" + ty_info.var_name + "_conv);"
 394                             else:
 395                                 from_hu_conv = (ty_info.var_name + " == null ? " + self.consts.native_zero_ptr + " : " + ty_info.var_name + ".clone_ptr()", "")
 396                                 base_conv += "\n" + "FREE(untag_ptr(" + ty_info.var_name + "));"
 397                         else:
 398                             base_conv = base_conv + self.consts.trait_struct_inc_refcnt(ty_info)
 399                             if needs_full_clone:
 400                                 base_conv += "// WARNING: we may need a move here but no clone is available for " + ty_info.rust_obj + "\n"
 401                     else:
 402                         base_conv = base_conv + "\n" + "FREE(untag_ptr(" + ty_info.var_name + "));"
 403                     if from_hu_conv is None:
 404                         from_hu_conv = (ty_info.var_name + " == null ? " + self.consts.native_zero_ptr + " : " + self.consts.get_ptr(ty_info.var_name), "")
 405                     from_hu_conv = (from_hu_conv[0], self.consts.add_ref("this", ty_info.var_name))
 406                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 407                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 408                         ret_conv = ret_conv, ret_conv_name = "tag_ptr(" + ty_info.var_name + "_ret, true)",
 409                         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") + ";",
 410                         to_hu_conv_name = "ret_hu_conv", from_hu_conv = from_hu_conv)
 411                 needs_full_clone = not is_free and (not ty_info.is_ptr or ty_info.requires_clone == True) and ty_info.requires_clone != False
 412                 if needs_full_clone:
 413                     if "res" in ty_info.var_name: # XXX: This is a stupid hack
 414                         needs_full_clone = False
 415                     if needs_full_clone and (ty_info.rust_obj.replace("LDK", "") + "_clone") in self.clone_fns:
 416                         # arg_conv is used when converting a function argument from java normally (with holds_ref set),
 417                         # and when converting a java value being returned from a trait method (with holds_ref unset).
 418                         # In the second case, we need to clone before returning to C (as once we return the GC can free the object),
 419                         # whereas in the first we prefer to clone in C to avoid additional Java code as much as possible.
 420                         if holds_ref:
 421                             base_conv += "\n" + ty_info.var_name + "_conv = " + ty_info.rust_obj.replace("LDK", "") + "_clone((" + ty_info.rust_obj + "*)untag_ptr(" + ty_info.var_name + "));"
 422                         else:
 423                             from_hu_conv = (ty_info.var_name + " == null ? " + self.consts.native_zero_ptr + " : " + ty_info.var_name + ".clone_ptr()", "")
 424                             base_conv += "\n" + "FREE(untag_ptr(" + ty_info.var_name + "));"
 425                     elif needs_full_clone:
 426                         base_conv = base_conv + "\n// WARNING: we may need a move here but no clone is available for " + ty_info.rust_obj
 427                 if not needs_full_clone and ty_info.rust_obj != "LDKu8slice" and (not holds_ref or is_free):
 428                     # Don't bother free'ing slices passed in - Rust doesn't auto-free the
 429                     # underlying unlike Vecs, and it gives Java more freedom.
 430                     base_conv = base_conv + "\nFREE(untag_ptr(" + ty_info.var_name + "));"
 431                 if ty_info.rust_obj in self.complex_enums:
 432                     to_hu_conv_sfx = ""
 433                     if needs_full_clone and (ty_info.rust_obj.replace("LDK", "") + "_clone") not in self.clone_fns:
 434                         # We really need a full clone here, but for now we just implement
 435                         # a manual clone explicitly for Option<Trait>s
 436                         if ty_info.contains_trait:
 437                             assert ty_info.rust_obj.startswith("LDKCOption") # We don't support contained traits for anything else yet
 438                             optional_ty = ty_info.rust_obj[11:-1]
 439                             assert "LDK" + optional_ty in self.trait_structs # We don't support contained traits for anything else yet
 440                             to_hu_conv_sfx = self.consts.add_ref("this", ty_info.var_name)
 441                             base_conv += "\nif (" + ty_info.var_name + "_conv.tag == " + ty_info.rust_obj + "_Some) {"
 442                             base_conv += "\n\t// Manually implement clone for Java trait instances"
 443                             optional_ty_info = self.java_c_types("LDK" + optional_ty + " " + ty_info.var_name, None)
 444                             base_conv += self.consts.trait_struct_inc_refcnt(optional_ty_info).\
 445                                 replace("\n", "\n\t").replace(ty_info.var_name + "_conv", ty_info.var_name + "_conv.some")
 446                             base_conv += "\n}"
 447                     ret_conv = (self.consts.ptr_c_ty + " " + ty_info.var_name + "_ref = tag_ptr(&", ", false);")
 448                     if not holds_ref:
 449                         ret_conv = (ty_info.rust_obj + " *" + ty_info.var_name + "_copy = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n", "")
 450                         ret_conv = (ret_conv[0] + "*" + ty_info.var_name + "_copy = ", "")
 451                         ret_conv = (ret_conv[0], ";\n" + self.consts.ptr_c_ty + " " + ty_info.var_name + "_ref = tag_ptr(" + ty_info.var_name + "_copy, true);")
 452                     if from_hu_conv is None:
 453                         from_hu_conv = (self.consts.get_ptr(ty_info.var_name), "")
 454                     from_hu_conv = (from_hu_conv[0], to_hu_conv_sfx)
 455                     fully_qualified_ty = self.consts.fully_qualified_hu_ty_path(ty_info)
 456                     to_hu_call = fully_qualified_ty + ".constr_from_ptr(" + ty_info.var_name + ")"
 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 = ty_info.var_name + "_ref",
 460                         to_hu_conv = self.consts.var_decl_statement(fully_qualified_ty, ty_info.var_name + "_hu_conv", to_hu_call) + ";\n" + self.consts.add_ref(ty_info.var_name + "_hu_conv", "this") + ";",
 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.result_types:
 463                     if holds_ref:
 464                         # If we're trying to return a ref, we have to clone.
 465                         # We just blindly assume its implemented and let the compiler fail if its not.
 466                         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 = ", ";")
 467                         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);")
 468                     else:
 469                         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 = ", ";")
 470                     if from_hu_conv is None:
 471                         from_hu_conv = (ty_info.var_name + " != null ? " + self.consts.get_ptr(ty_info.var_name) + " : " + self.consts.native_zero_ptr, "")
 472                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 473                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 474                         ret_conv = ret_conv, ret_conv_name = "tag_ptr(" + ty_info.var_name + "_conv, true)",
 475                         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 + ")") + ";",
 476                         to_hu_conv_name = ty_info.var_name + "_hu_conv", from_hu_conv = from_hu_conv)
 477                 if ty_info.rust_obj in self.tuple_types:
 478                     ret_conv_name = "tag_ptr(" + ty_info.var_name + "_conv, "
 479                     if holds_ref:
 480                         # If we're trying to return a ref, we have to clone.
 481                         if (ty_info.rust_obj.replace("LDK", "") + "_clone") not in self.clone_fns:
 482                             ret_conv = (ty_info.rust_obj + "* " + ty_info.var_name + "_conv = &", "")
 483                             ret_conv = (ret_conv[0], ";\n// WARNING: we really need to clone here, but no clone is available for " + ty_info.rust_obj)
 484                             ret_conv_name += "false)"
 485                         else:
 486                             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 = ", ";")
 487                             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);")
 488                             ret_conv_name += "true)"
 489                     else:
 490                         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 = ", ";")
 491                         ret_conv_name += "true)"
 492                     if not ty_info.is_ptr or holds_ref:
 493                         to_hu_conv_sfx = "\n" + self.consts.add_ref(ty_info.var_name + "_hu_conv", "this") + ";"
 494                     else:
 495                         to_hu_conv_sfx = ""
 496                     if from_hu_conv is None:
 497                         from_hu_conv = (ty_info.var_name + " != null ? " + self.consts.get_ptr(ty_info.var_name) + " : " + self.consts.native_zero_ptr, "")
 498                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 499                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 500                         ret_conv = ret_conv, ret_conv_name = ret_conv_name,
 501                         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,
 502                         to_hu_conv_name = ty_info.var_name + "_hu_conv", from_hu_conv = from_hu_conv)
 503
 504                 # The manually-defined types - TxOut, BigEndianScalar, u5, and Error
 505                 if ty_info.rust_obj == "LDKError":
 506                     assert from_hu_conv is None
 507                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 508                         arg_conv = "", arg_conv_name = "(LDKError){ ._dummy = 0 }", arg_conv_cleanup = None,
 509                         ret_conv = ("/*", "*/"), ret_conv_name = "0",
 510                         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 + ")") + ";",
 511                         to_hu_conv_name = ty_info.var_name + "_conv", from_hu_conv = ("0", ""))
 512
 513                 if ty_info.rust_obj == "LDKu5" or ty_info.rust_obj == "LDKWitnessVersion":
 514                     assert from_hu_conv is None
 515                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 516                         arg_conv = "", arg_conv_name = "(" + ty_info.rust_obj + "){ ._0 = " + ty_info.var_name + " }", arg_conv_cleanup = None,
 517                         ret_conv = ("uint8_t " + ty_info.var_name + "_val = ", "._0;"), ret_conv_name = ty_info.var_name + "_val",
 518                         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 + ")") + ";",
 519                         to_hu_conv_name = ty_info.var_name + "_conv", from_hu_conv = (ty_info.var_name + ".getVal()", ""))
 520
 521                 assert ty_info.rust_obj == "LDKTxOut" or ty_info.rust_obj == "LDKBigEndianScalar"
 522                 if not ty_info.is_ptr and not holds_ref:
 523                     ret_conv = (ty_info.rust_obj + "* " + ty_info.var_name + "_ref = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n*" + ty_info.var_name + "_ref = ", ";")
 524                     ret_conv_name = "tag_ptr(" + ty_info.var_name + "_ref, true)"
 525                 else:
 526                     ret_conv = (ty_info.rust_obj + "* " + ty_info.var_name + "_ref = &", ";")
 527                     ret_conv_name = "tag_ptr(" + ty_info.var_name + "_ref, false)"
 528                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 529                     arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 530                     ret_conv = ret_conv, ret_conv_name = ret_conv_name,
 531                     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 + ")") + ";",
 532                     to_hu_conv_name = ty_info.var_name + "_conv", from_hu_conv = (self.consts.get_ptr(ty_info.var_name), ""))
 533             elif ty_info.is_ptr:
 534                 assert(not is_free)
 535                 if ty_info.rust_obj in self.complex_enums:
 536                     ret_conv = (self.consts.ptr_c_ty + " ref_" + ty_info.var_name + " = tag_ptr(", ", false); // WARNING: We should clone here!")
 537                     from_hu_sfx = self.consts.add_ref("this", ty_info.var_name)
 538                     if ty_info.rust_obj.replace("LDK", "") + "_clone" in self.clone_fns:
 539                         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"
 540                         ret_conv_pfx += "*ret_" + ty_info.var_name + " = " + ty_info.rust_obj.replace("LDK", "") + "_clone("
 541                         ret_conv_sfx = ");\n" + self.consts.ptr_c_ty + " ref_" + ty_info.var_name + " = tag_ptr(ret_" + ty_info.var_name + ", true);"
 542                         ret_conv = (ret_conv_pfx, ret_conv_sfx)
 543                         from_hu_sfx = ""
 544                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 545                         arg_conv = ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)untag_ptr(" + ty_info.var_name + ");",
 546                         arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 547                         ret_conv = ret_conv, ret_conv_name = "ref_" + ty_info.var_name,
 548                         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 + ")") + ";",
 549                         to_hu_conv_name = ty_info.var_name + "_hu_conv",
 550                         from_hu_conv = (ty_info.var_name + " == null ? " + self.consts.native_zero_ptr + " : " + self.consts.get_ptr(ty_info.var_name), from_hu_sfx))
 551                 elif ty_info.rust_obj in self.trait_structs:
 552                     if ty_info.nonnull_ptr:
 553                         arg_conv = "void* " + ty_info.var_name + "_ptr = untag_ptr(" + ty_info.var_name + ");\n"
 554                         arg_conv += "if (ptr_is_owned(" + ty_info.var_name + ")) { CHECK_ACCESS(" + ty_info.var_name + "_ptr); }\n"
 555                         arg_conv += ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)" + ty_info.var_name + "_ptr;"
 556                         arg_conv_name = ty_info.var_name + "_conv"
 557                     else:
 558                         # We map Option<Trait> as *mut Trait, which we can differentiate from &Trait by the NONNULL_PTR annotation.
 559                         # We handle the Option<Trait> case here.
 560                         arg_conv = ty_info.rust_obj + " *" + ty_info.var_name + "_conv_ptr = NULL;\n"
 561                         arg_conv += "if (" + ty_info.var_name + " != 0) {\n"
 562                         arg_conv += "\t" + ty_info.rust_obj + " " + ty_info.var_name + "_conv;\n"
 563                         arg_conv += "void* " + ty_info.var_name + "_ptr = untag_ptr(" + ty_info.var_name + ");\n"
 564                         arg_conv += "CHECK_ACCESS(" + ty_info.var_name + "_ptr);\n"
 565                         arg_conv += "\t" + ty_info.var_name + "_conv = *(" + ty_info.rust_obj + "*)" + ty_info.var_name + "_ptr;"
 566                         arg_conv += self.consts.trait_struct_inc_refcnt(ty_info).replace("\n", "\n\t")
 567                         arg_conv += "\n\t" + ty_info.var_name + "_conv_ptr = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n"
 568                         arg_conv += "\t*" + ty_info.var_name + "_conv_ptr = " + ty_info.var_name + "_conv;\n"
 569                         arg_conv += "}"
 570                         arg_conv_name = ty_info.var_name + "_conv_ptr"
 571                     if ty_info.rust_obj.replace("LDK", "") + "_clone" in self.clone_fns:
 572                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 573                             arg_conv = arg_conv, arg_conv_name = arg_conv_name, arg_conv_cleanup = None,
 574                             ret_conv = (ty_info.rust_obj + " *" + ty_info.var_name + "_clone = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n" +
 575                                 "*" + ty_info.var_name + "_clone = " + ty_info.rust_obj.replace("LDK", "") + "_clone(", ");"),
 576                             ret_conv_name = "tag_ptr(" + ty_info.var_name + "_clone, true)",
 577                             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") + ";",
 578                             to_hu_conv_name = "ret_hu_conv",
 579                             from_hu_conv = (ty_info.var_name + " == null ? " + self.consts.native_zero_ptr + " : " + self.consts.get_ptr(ty_info.var_name), ""))
 580                     else:
 581                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 582                             arg_conv = arg_conv, arg_conv_name = arg_conv_name, arg_conv_cleanup = None,
 583                             ret_conv = ("// WARNING: This object doesn't live past this scope, needs clone!\n" + self.consts.ptr_c_ty + " ret_" + ty_info.var_name + " = tag_ptr(", ", false);"),
 584                             ret_conv_name = "ret_" + ty_info.var_name,
 585                             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") + ";",
 586                             to_hu_conv_name = "ret_hu_conv",
 587                             from_hu_conv = (ty_info.var_name + " == null ? " + self.consts.native_zero_ptr + " : " + self.consts.get_ptr(ty_info.var_name), self.consts.add_ref("this", ty_info.var_name)))
 588                 ret_conv = (self.consts.ptr_c_ty + " ret_" + ty_info.var_name + " = tag_ptr(", ", true);")
 589                 if holds_ref:
 590                     ret_conv = (ret_conv[0], ", false);")
 591                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 592                     arg_conv = ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)untag_ptr(" + ty_info.var_name + ");",
 593                     arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 594                     ret_conv = ret_conv, ret_conv_name = "ret_" + ty_info.var_name,
 595                     to_hu_conv = "TODO 3", to_hu_conv_name = None, from_hu_conv = None) # its a pointer, no conv needed
 596             assert False # We should have handled every case by now.