_ 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" or ty_info.c_ty == "int16_tArray":
  47                 (set_pfx, set_sfx) = self.consts.set_native_arr_contents(arr_name + "_arr", arr_len, ty_info)
  48                 ret_conv = (ty_info.c_ty + " " + 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" and ty_info.rust_obj != "LDKu16slice"):
  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" or ty_info.rust_obj == "LDKWitness":
  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], ";\n" + ty_info.c_ty + " " + 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" and ty_info.rust_obj != "LDKu16slice"):
  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                     # Note that we just blindly assume we should be using unsigned integers here.
  78                     arg_conv = "u" + ty_info.subty.c_ty + " " + arr_name + "_arr[" + arr_len + "];\n"
  79                     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"
  80                     arg_conv = arg_conv + self.consts.get_native_arr_contents(arr_name, arr_name + "_arr", arr_len, ty_info, True) + ";\n"
  81                     arg_conv = arg_conv + "u" + ty_info.subty.c_ty + " (*" + arr_name + "_ref)[" + arr_len + "] = &" + arr_name + "_arr;"
  82                     ret_conv = (ret_conv[0] + "*", set_sfx + ";")
  83                     from_hu_conv = self.consts.primitive_arr_from_hu(ty_info, arr_len, arr_name)
  84                     to_hu_conv = self.consts.primitive_arr_to_hu(ty_info, None, arr_name, arr_name + "_conv")
  85                 to_hu_conv_name = None
  86                 if to_hu_conv is not None:
  87                     to_hu_conv_name = arr_name + "_conv"
  88                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
  89                     arg_conv = arg_conv, arg_conv_name = arr_name + "_ref", arg_conv_cleanup = arg_conv_cleanup,
  90                     ret_conv = ret_conv, ret_conv_name = arr_name + "_arr",
  91                     to_hu_conv = to_hu_conv, to_hu_conv_name = to_hu_conv_name,
  92                     from_hu_conv = from_hu_conv)
  93             else:
  94                 assert not arr_len.isdigit() # fixed length arrays not implemented
  95                 assert ty_info.java_hu_ty[len(ty_info.java_hu_ty) - 2:] == "[]"
  96                 if arr_name == "":
  97                     arr_name = "ret"
  98                 conv_name = arr_name + "_conv_" + str(len(ty_info.java_hu_ty))
  99                 idxc = chr(ord('a') + (len(ty_info.java_hu_ty) % 26))
 100                 ty_info.subty.var_name = conv_name
 101                 #XXX: We'd really prefer to only ever set to False, avoiding lots of clone, but need smarter free logic
 102                 #if ty_info.is_ptr or holds_ref:
 103                 #    ty_info.subty.requires_clone = False
 104                 ty_info.subty.requires_clone = not ty_info.is_ptr or not holds_ref
 105                 if not ty_info.subty.is_native_primitive and ty_info.subty.rust_obj == "LDKChannelMonitor":
 106                     # We take a Vec of references to ChannelMonitors as input to ChannelManagerReadArgs, if we clone them,
 107                     # we end up freeing the clones after creating the ChannelManagerReadArgs before calling the read
 108                     # function itself, resulting in a segfault. Thus, we manually check and ensure we don't clone for
 109                     # ChannelMonitors inside of vecs.
 110                     ty_info.subty.requires_clone = False
 111                 subty = self.map_type_with_info(ty_info.subty, False, None, is_free, holds_ref, False)
 112                 arg_conv = ty_info.rust_obj + " " + arr_name + "_constr;\n"
 113                 pf = ""
 114                 if ty_info.is_ptr:
 115                     pf = "\t"
 116                     arg_conv += ty_info.rust_obj + " *" + arr_name + "_ptr = NULL;\n"
 117                     arg_conv += "if (" + self.consts.is_arr_some_check[0] + arr_name + self.consts.is_arr_some_check[1] + ") {\n"
 118                 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"
 119                 arg_conv += pf + "if (" + arr_name + "_constr." + arr_len + " > 0)\n"
 120                 if subty.is_native_primitive:
 121                     szof = subty.c_ty
 122                 else:
 123                     szof = subty.rust_obj
 124                 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"
 125                 arg_conv += pf + "else\n"
 126                 arg_conv += pf + "\t" + arr_name + "_constr." + ty_info.arr_access + " = NULL;\n"
 127                 get_arr = self.consts.get_native_arr_contents(arr_name, "NO_DEST", arr_name + "_constr." + arr_len, ty_info, False)
 128                 if get_arr != None:
 129                     arg_conv += pf + subty.c_ty + "* " + arr_name + "_vals = " + get_arr + ";\n"
 130                 arg_conv += pf + "for (size_t " + idxc + " = 0; " + idxc + " < " + arr_name + "_constr." + arr_len + "; " + idxc + "++) {\n"
 131                 if get_arr != None:
 132                     arg_conv += pf + "\t" + subty.c_ty + " " + conv_name + " = " + arr_name + "_vals[" + idxc + "];"
 133                     if subty.arg_conv is not None:
 134                         arg_conv += "\n\t" + pf + subty.arg_conv.replace("\n", "\n\t" + pf)
 135                 else:
 136                     arg_conv += pf + "\t" + subty.c_ty + " " + conv_name + " = " + self.consts.get_native_arr_elem(arr_name, idxc, ty_info) + ";\n"
 137                     arg_conv += pf + "\t" + subty.arg_conv.replace("\n", "\n\t" + pf)
 138                 arg_conv += "\n\t" + pf + arr_name + "_constr." + ty_info.arr_access + "[" + idxc + "] = " + subty.arg_conv_name + ";\n" + pf + "}"
 139                 if get_arr != None:
 140                     cleanup = self.consts.cleanup_native_arr_ref_contents(arr_name, arr_name + "_vals", arr_name + "_constr." + arr_len, ty_info)
 141                     if cleanup is not None:
 142                         arg_conv += "\n" + pf + cleanup + ";"
 143                 if ty_info.is_ptr:
 144                     arg_conv_name = arr_name + "_ptr"
 145                 else:
 146                     arg_conv_name = arr_name + "_constr"
 147                 arg_conv_cleanup = None
 148                 if ty_info.is_ptr:
 149                     arg_conv_cleanup = "if (" + arr_name + "_ptr != NULL) { FREE(" + arr_name + "_constr." + ty_info.arr_access + "); }"
 150                 if ty_info.is_ptr:
 151                     arg_conv += "\n\t" + arr_name + "_ptr = &" + arr_name + "_constr;\n}"
 152
 153                 if is_nullable:
 154                     ret_conv = (ty_info.rust_obj + " *" + arr_name + "_var_ptr = ", "")
 155                 else:
 156                     ret_conv = (ty_info.rust_obj + " " + arr_name + "_var = ", "")
 157                 if subty.ret_conv is None:
 158                     ret_conv = ("DUMMY", "DUMMY")
 159                 else:
 160                     ret_conv = (ret_conv[0], ";\n" + ty_info.c_ty + " " + arr_name + "_arr = NULL;\n")
 161                     indent = ""
 162                     if is_nullable:
 163                         ret_conv = (ret_conv[0], ret_conv[1] + "if (" + arr_name + " != NULL) {\n")
 164                         ret_conv = (ret_conv[0], ret_conv[1] + "\t" + ty_info.rust_obj + " " + arr_name + "_var = *" + arr_name + "_var_ptr;\n")
 165                         indent = "\t"
 166                     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")
 167                     get_ptr_call = self.consts.get_native_arr_ptr_call(ty_info)
 168                     if get_ptr_call is not None:
 169                         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")
 170                     ret_conv = (ret_conv[0], ret_conv[1] + indent + "for (size_t " + idxc + " = 0; " + idxc + " < " + arr_name + "_var." + arr_len + "; " + idxc + "++) {\n")
 171                     ret_conv = (ret_conv[0], ret_conv[1] + indent + "\t" + subty.ret_conv[0].replace("\n", "\n\t" + indent))
 172                     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")
 173                     if get_ptr_call is not None:
 174                         ret_conv = (ret_conv[0], ret_conv[1] + indent + "\t" + arr_name + "_arr_ptr[" + idxc + "] = " + subty.ret_conv_name + ";\n" + indent + "}\n")
 175                     else:
 176                         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")
 177                     cleanup = self.consts.release_native_arr_ptr_call(ty_info, arr_name + "_arr", arr_name + "_arr_ptr")
 178                     if cleanup is not None:
 179                         ret_conv = (ret_conv[0], ret_conv[1] + indent + cleanup + ";")
 180                     if not holds_ref and not is_nullable:
 181                         # XXX: The commented if's are a bit smarter freeing, but we need to be a nudge smarter still
 182                         # Note that we don't drop the full vec here - we're passing ownership to java (or have cloned) or free'd by now!
 183                         ret_conv = (ret_conv[0], ret_conv[1] + "\n" + indent + "FREE(" + arr_name + "_var." + ty_info.arr_access + ");")
 184                         #if subty.rust_obj is not None and subty.rust_obj in self.opaque_structs:
 185                         #    ret_conv = (ret_conv[0], ret_conv[1] + "\nFREE(" + arr_name + "_var." + ty_info.arr_access + ");")
 186                         #else:
 187                         #    ret_conv = (ret_conv[0], ret_conv[1] + "\n" + ty_info.rust_obj.replace("LDK", "") + "_free(" + arr_name + "_var);")
 188                     if is_nullable:
 189                         ret_conv = (ret_conv[0], ret_conv[1] + "\n}")
 190
 191                 if subty.to_hu_conv is not None:
 192                     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"
 193                     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"))
 194                     to_hu_conv += ";\n"
 195                     pfx = ""
 196                     if is_nullable:
 197                         to_hu_conv += "if (" + arr_name + " != null) {\n"
 198                         pfx = "\t"
 199                     to_hu_conv += pfx + self.consts.for_n_in_range(idxc, "0", conv_name + "_len") + "\n"
 200
 201                     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"
 202                     to_hu_conv += pfx + "\t" + subty.to_hu_conv.replace("\n", "\n\t" + pfx) + "\n"
 203                     to_hu_conv += pfx + "\t" + conv_name + "_arr[" + idxc + "] = " + subty.to_hu_conv_name + ";\n"
 204                     to_hu_conv += pfx + "}"
 205                     if is_nullable:
 206                         to_hu_conv += "\n}"
 207                     cleanup = self.consts.cleanup_converted_native_array(ty_info, arr_name)
 208                     if cleanup is not None:
 209                         to_hu_conv += "\n" + cleanup
 210                     to_hu_conv_name = conv_name + "_arr"
 211                 else:
 212                     to_hu_conv = self.consts.primitive_arr_to_hu(ty_info, None, arr_name, arr_name + "_conv")
 213                     if to_hu_conv is not None:
 214                         to_hu_conv_name = arr_name + "_conv"
 215                     else:
 216                         to_hu_conv_name = None
 217                 from_hu_conv = self.consts.primitive_arr_from_hu(ty_info, None, arr_name)
 218                 if subty.from_hu_conv is not None:
 219                     hu_conv_b = ""
 220                     if subty.from_hu_conv[1] != "":
 221                         iterator = self.consts.for_n_in_arr(conv_name, arr_name, subty)
 222                         if is_nullable:
 223                             hu_conv_b = "if (" + arr_name + " != null) { " + iterator[0] + subty.from_hu_conv[1] + ";" + iterator[1] + " }"
 224                         else:
 225                             hu_conv_b = iterator[0] + subty.from_hu_conv[1] + ";" + iterator[1]
 226                     if from_hu_conv is not None:
 227                         arr_conv = self.consts.primitive_arr_from_hu(ty_info, None, self.consts.map_hu_array_elems(arr_name, conv_name, ty_info, subty, is_nullable))
 228                         assert arr_conv[1] == ""
 229                         from_hu_conv = (arr_conv[0], hu_conv_b)
 230                     else:
 231                         from_hu_conv = (self.consts.map_hu_array_elems(arr_name, conv_name, ty_info, subty, is_nullable), hu_conv_b)
 232
 233                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 234                     arg_conv = arg_conv, arg_conv_name = arg_conv_name, arg_conv_cleanup = arg_conv_cleanup,
 235                     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)
 236         elif ty_info.java_fn_ty_arg == "Ljava/lang/String;":
 237             assert not is_nullable
 238             if not is_free:
 239                 arg_conv = "LDKStr " + ty_info.var_name + "_conv = " + self.consts.str_ref_to_c_call(ty_info.var_name) + ";"
 240                 arg_conv_name = ty_info.var_name + "_conv"
 241             else:
 242                 arg_conv = "LDKStr dummy = { .chars = NULL, .len = 0, .chars_is_owned = false };"
 243                 arg_conv_name = "dummy"
 244             if ty_info.arr_access is None:
 245                 assert False
 246                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 247                     arg_conv = arg_conv, arg_conv_name = arg_conv_name, arg_conv_cleanup = None,
 248                     ret_conv = ("const char* " + ty_info.var_name + "_str = ",
 249                         ";\njstring " + ty_info.var_name + "_conv = " + self.consts.str_ref_to_native_call(ty_info.var_name + "_str", "strlen(" + ty_info.var_name + "_str)") + ";"),
 250                     ret_conv_name = ty_info.var_name + "_conv",
 251                     to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 252             else:
 253                 free_str = ""
 254                 if not holds_ref:
 255                     free_str = "\nStr_free(" + ty_info.var_name + "_str);"
 256                 to_hu_conv = self.consts.str_to_hu_conv(ty_info.var_name)
 257                 to_hu_conv_name = None
 258                 if to_hu_conv is not None:
 259                     to_hu_conv_name = ty_info.var_name + "_conv"
 260                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 261                     arg_conv = arg_conv, arg_conv_name = arg_conv_name, arg_conv_cleanup = None,
 262                     ret_conv = ("LDKStr " + ty_info.var_name + "_str = ",
 263                         ";\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),
 264                     ret_conv_name = ty_info.var_name + "_conv",
 265                     to_hu_conv=to_hu_conv, to_hu_conv_name=to_hu_conv_name,
 266                     from_hu_conv = self.consts.str_from_hu_conv(ty_info.var_name))
 267         elif ty_info.var_name == "" and not print_void:
 268             # We don't have a parameter name, and want one, just call it arg
 269             if not ty_info.is_native_primitive:
 270                 assert(not is_free or ty_info.rust_obj not in self.opaque_structs)
 271                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 272                     arg_conv = ty_info.rust_obj + " arg_conv = *(" + ty_info.rust_obj + "*)untag_ptr(arg);\nFREE(untag_ptr(arg));",
 273                     arg_conv_name = "arg_conv", arg_conv_cleanup = None,
 274                     ret_conv = None, ret_conv_name = None, to_hu_conv = "TODO 7", to_hu_conv_name = None, from_hu_conv = None)
 275             else:
 276                 assert(not is_free)
 277                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 278                     arg_conv = None, arg_conv_name = "arg", arg_conv_cleanup = None,
 279                     ret_conv = None, ret_conv_name = None, to_hu_conv = "TODO 8", to_hu_conv_name = None, from_hu_conv = None)
 280         elif ty_info.is_native_primitive and ty_info.c_ty != "void":
 281             assert not is_nullable
 282             return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 283                 arg_conv = None, arg_conv_name =  ty_info.var_name, arg_conv_cleanup = None,
 284                 ret_conv = (ty_info.c_ty + " " + ty_info.var_name + "_conv = ", ";"), ret_conv_name = ty_info.var_name + "_conv",
 285                 to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 286         elif ty_info.c_ty == "void":
 287             assert ty_info.is_native_primitive
 288             assert not is_nullable
 289             return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 290                 arg_conv = None, arg_conv_name =  ty_info.var_name, arg_conv_cleanup = None,
 291                 ret_conv = None, ret_conv_name = ty_info.var_name,
 292                 to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 293         else:
 294             if ty_info.var_name == "":
 295                 ty_info.var_name = "ret"
 296
 297             if ty_info.rust_obj in self.opaque_structs:
 298                 if is_nullable:
 299                     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))
 300                 else:
 301                     from_hu_conv = (self.consts.get_ptr(ty_info.var_name), self.consts.add_ref("this", ty_info.var_name))
 302                 opaque_arg_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv;\n"
 303                 opaque_arg_conv = opaque_arg_conv + ty_info.var_name + "_conv.inner = untag_ptr(" + ty_info.var_name + ");\n"
 304                 opaque_arg_conv += ty_info.var_name + "_conv.is_owned = ptr_is_owned(" + ty_info.var_name + ");\n"
 305                 opaque_arg_conv += "CHECK_INNER_FIELD_ACCESS_OR_NULL(" + ty_info.var_name + "_conv);"
 306
 307                 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:
 308                     if (ty_info.rust_obj.replace("LDK", "") + "_clone") in self.clone_fns:
 309                         # 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.
 310                         # arg_conv is used when converting a function argument from java normally (with holds_ref set),
 311                         # and when converting a java value being returned from a trait method (with holds_ref unset).
 312                         # In the second case, we need to clone before returning to C (as once we return the GC can free the object),
 313                         # whereas in the first we prefer to clone in C to avoid additional Java code as much as possible.
 314                         if holds_ref:
 315                             opaque_arg_conv += "\n" + ty_info.var_name + "_conv = " + ty_info.rust_obj.replace("LDK", "") + "_clone(&" + ty_info.var_name + "_conv);"
 316                         elif is_nullable:
 317                             from_hu_conv = (ty_info.var_name + " == null ? " + self.consts.native_zero_ptr + " : " + ty_info.var_name + ".clone_ptr()", "")
 318                         else:
 319                             from_hu_conv = (ty_info.var_name + ".clone_ptr()", "")
 320                     elif ty_info.passed_as_ptr:
 321                         opaque_arg_conv += "\n// WARNING: we need a move here but no clone is available for " + ty_info.rust_obj + "\n"
 322                         # TODO: Once we support features cloning (which just isn't in C yet), we can make this a compile error instead!
 323                         from_hu_conv = (from_hu_conv[0], from_hu_conv[1] + ";\n" +
 324                             "// Due to rust's strict-ownership memory model, in some cases we need to \"move\"\n" +
 325                             "// an object to pass exclusive ownership to the function being called.\n" +
 326                             "// In most cases, we avoid this being visible in GC'd languages by cloning the object\n" +
 327                             "// at the FFI layer, creating a new object which Rust can claim ownership of\n" +
 328                             "// However, in some cases (eg here), there is no way to clone an object, and thus\n" +
 329                             "// we actually have to pass full ownership to Rust.\n" +
 330                             "// 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))
 331                 elif not is_free:
 332                     opaque_arg_conv += "\n" + ty_info.var_name + "_conv.is_owned = false;"
 333
 334                 opaque_ret_conv_suf = ";\n"
 335                 opaque_ret_conv_suf += self.consts.ptr_c_ty + " " + ty_info.var_name + "_ref = 0;\n"
 336                 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
 337                     opaque_ret_conv_suf += ty_info.var_name + "_var = " + ty_info.rust_obj.replace("LDK", "") + "_clone(&" + ty_info.var_name + "_var);\n"
 338                 elif not holds_ref and ty_info.is_ptr:
 339                     opaque_ret_conv_suf += "// WARNING: we may need a move here but no clone is available for " + ty_info.rust_obj + "\n"
 340
 341                 opaque_ret_conv_suf += "CHECK_INNER_FIELD_ACCESS_OR_NULL(" + ty_info.var_name + "_var);\n"
 342                 if holds_ref:
 343                     opaque_ret_conv_suf += ty_info.var_name + "_ref = tag_ptr(" + ty_info.var_name + "_var.inner, false);"
 344                 else:
 345                     opaque_ret_conv_suf += ty_info.var_name + "_ref = tag_ptr(" + ty_info.var_name + "_var.inner, " + ty_info.var_name + "_var.is_owned);"
 346
 347                 to_hu_conv_sfx = ""
 348                 if not ty_info.is_ptr or holds_ref:
 349                     to_hu_conv_sfx = "\n" + self.consts.add_ref(ty_info.var_name + "_hu_conv", "this") + ";"
 350                 qualified_hu_ty = self.consts.fully_qualified_hu_ty_path(ty_info)
 351                 if ty_info.is_ptr:
 352                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 353                         arg_conv = opaque_arg_conv, arg_conv_name = "&" + ty_info.var_name + "_conv", arg_conv_cleanup = None,
 354                         ret_conv = (ty_info.rust_obj + " " + ty_info.var_name + "_var = *", opaque_ret_conv_suf),
 355                         ret_conv_name = ty_info.var_name + "_ref",
 356                         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,
 357                         to_hu_conv_name = ty_info.var_name + "_hu_conv",
 358                         from_hu_conv = from_hu_conv)
 359                 else:
 360                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 361                         arg_conv = opaque_arg_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 362                         ret_conv = (ty_info.rust_obj + " " + ty_info.var_name + "_var = ", opaque_ret_conv_suf),
 363                         ret_conv_name = ty_info.var_name + "_ref",
 364                         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,
 365                         to_hu_conv_name = ty_info.var_name + "_hu_conv",
 366                         from_hu_conv = from_hu_conv)
 367
 368             assert not is_nullable
 369             if not ty_info.is_ptr:
 370                 if ty_info.rust_obj in self.unitary_enums:
 371                     (ret_pfx, ret_sfx) = self.consts.c_unitary_enum_to_native_call(ty_info)
 372                     (arg_pfx, arg_sfx) = self.consts.native_unitary_enum_to_c_call(ty_info)
 373                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 374                         arg_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv = " + arg_pfx + ty_info.var_name + arg_sfx + ";",
 375                         arg_conv_name = ty_info.var_name + "_conv",
 376                         arg_conv_cleanup = None,
 377                         ret_conv = (ty_info.c_ty + " " + ty_info.var_name + "_conv = " + ret_pfx, ret_sfx + ";"),
 378                         ret_conv_name = ty_info.var_name + "_conv", to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 379                 base_conv = "void* " + ty_info.var_name + "_ptr = untag_ptr(" + ty_info.var_name + ");\n"
 380                 base_conv += "CHECK_ACCESS(" + ty_info.var_name + "_ptr);\n"
 381                 base_conv += ty_info.rust_obj + " " + ty_info.var_name + "_conv = *(" + ty_info.rust_obj + "*)(" + ty_info.var_name + "_ptr);"
 382                 from_hu_conv = None
 383                 if ty_info.rust_obj in self.trait_structs:
 384                     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 = ", ";")
 385                     if holds_ref:
 386                         if (ty_info.rust_obj.replace("LDK", "") + "_clone") in self.clone_fns:
 387                             ret_conv = (ret_conv[0] + ty_info.rust_obj.replace("LDK", "") + "_clone(&", ");")
 388                         else:
 389                             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")
 390                             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)"))
 391                     if not is_free:
 392                         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
 393                         if needs_full_clone and (ty_info.rust_obj.replace("LDK", "") + "_clone") in self.clone_fns:
 394                             # arg_conv is used when converting a function argument from java normally (with holds_ref set),
 395                             # and when converting a java value being returned from a trait method (with holds_ref unset).
 396                             # In the second case, we need to clone before returning to C (as once we return the GC can free the object),
 397                             # whereas in the first we prefer to clone in C to avoid additional Java code as much as possible.
 398                             if holds_ref:
 399                                 base_conv += "\n" + ty_info.var_name + "_conv = " + ty_info.rust_obj.replace("LDK", "") + "_clone(&" + ty_info.var_name + "_conv);"
 400                             else:
 401                                 from_hu_conv = (ty_info.var_name + ".clone_ptr()", "")
 402                                 base_conv += "\n" + "FREE(untag_ptr(" + ty_info.var_name + "));"
 403                         else:
 404                             base_conv = base_conv + self.consts.trait_struct_inc_refcnt(ty_info)
 405                             if needs_full_clone:
 406                                 base_conv += "// WARNING: we may need a move here but no clone is available for " + ty_info.rust_obj + "\n"
 407                     else:
 408                         base_conv = base_conv + "\n" + "FREE(untag_ptr(" + ty_info.var_name + "));"
 409                     if from_hu_conv is None:
 410                         from_hu_conv = (self.consts.get_ptr(ty_info.var_name), "")
 411                     from_hu_conv = (from_hu_conv[0], self.consts.add_ref("this", ty_info.var_name))
 412                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 413                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 414                         ret_conv = ret_conv, ret_conv_name = "tag_ptr(" + ty_info.var_name + "_ret, true)",
 415                         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") + ";",
 416                         to_hu_conv_name = "ret_hu_conv", from_hu_conv = from_hu_conv)
 417                 needs_full_clone = not is_free and (not ty_info.is_ptr or ty_info.requires_clone == True) and ty_info.requires_clone != False
 418                 if needs_full_clone:
 419                     if "res" in ty_info.var_name: # XXX: This is a stupid hack
 420                         needs_full_clone = False
 421                     if needs_full_clone and (ty_info.rust_obj.replace("LDK", "") + "_clone") in self.clone_fns:
 422                         # arg_conv is used when converting a function argument from java normally (with holds_ref set),
 423                         # and when converting a java value being returned from a trait method (with holds_ref unset).
 424                         # In the second case, we need to clone before returning to C (as once we return the GC can free the object),
 425                         # whereas in the first we prefer to clone in C to avoid additional Java code as much as possible.
 426                         if holds_ref:
 427                             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 + "));"
 428                         else:
 429                             from_hu_conv = (ty_info.var_name + ".clone_ptr()", "")
 430                             base_conv += "\n" + "FREE(untag_ptr(" + ty_info.var_name + "));"
 431                     elif needs_full_clone:
 432                         base_conv = base_conv + "\n// WARNING: we may need a move here but no clone is available for " + ty_info.rust_obj
 433                 if not needs_full_clone and ty_info.rust_obj != "LDKu8slice" and (not holds_ref or is_free):
 434                     # Don't bother free'ing slices passed in - Rust doesn't auto-free the
 435                     # underlying unlike Vecs, and it gives Java more freedom.
 436                     base_conv = base_conv + "\nFREE(untag_ptr(" + ty_info.var_name + "));"
 437                 if ty_info.rust_obj in self.complex_enums:
 438                     if needs_full_clone and (ty_info.rust_obj.replace("LDK", "") + "_clone") not in self.clone_fns:
 439                         # We really need a full clone here, but for now we just implement
 440                         # a manual clone explicitly for Option<Trait>s
 441                         if ty_info.contains_trait:
 442                             assert ty_info.rust_obj.startswith("LDKCOption") # We don't support contained traits for anything else yet
 443                             optional_ty = ty_info.rust_obj[11:-1]
 444                             assert "LDK" + optional_ty in self.trait_structs # We don't support contained traits for anything else yet
 445                             base_conv += "\nif (" + ty_info.var_name + "_conv.tag == " + ty_info.rust_obj + "_Some) {"
 446                             base_conv += "\n\t// Manually implement clone for Java trait instances"
 447                             optional_ty_info = self.java_c_types("LDK" + optional_ty + " " + ty_info.var_name, None)
 448                             base_conv += self.consts.trait_struct_inc_refcnt(optional_ty_info).\
 449                                 replace("\n", "\n\t").replace(ty_info.var_name + "_conv", ty_info.var_name + "_conv.some")
 450                             base_conv += "\n}"
 451                     ret_conv = (self.consts.ptr_c_ty + " " + ty_info.var_name + "_ref = tag_ptr(&", ", false);")
 452                     if not holds_ref:
 453                         ret_conv = (ty_info.rust_obj + " *" + ty_info.var_name + "_copy = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n", "")
 454                         ret_conv = (ret_conv[0] + "*" + ty_info.var_name + "_copy = ", "")
 455                         ret_conv = (ret_conv[0], ";\n" + self.consts.ptr_c_ty + " " + ty_info.var_name + "_ref = tag_ptr(" + ty_info.var_name + "_copy, true);")
 456                     if from_hu_conv is None:
 457                         from_hu_conv = (self.consts.get_ptr(ty_info.var_name), "")
 458                     from_hu_conv = (from_hu_conv[0], self.consts.add_ref("this", ty_info.var_name))
 459                     fully_qualified_ty = self.consts.fully_qualified_hu_ty_path(ty_info)
 460                     to_hu_call = fully_qualified_ty + ".constr_from_ptr(" + ty_info.var_name + ")"
 461                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 462                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 463                         ret_conv = ret_conv, ret_conv_name = ty_info.var_name + "_ref",
 464                         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") + ";",
 465                         to_hu_conv_name = ty_info.var_name + "_hu_conv", from_hu_conv = from_hu_conv)
 466                 if ty_info.rust_obj in self.result_types:
 467                     if holds_ref:
 468                         # If we're trying to return a ref, we have to clone.
 469                         # We just blindly assume its implemented and let the compiler fail if its not.
 470                         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 = ", ";")
 471                         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);")
 472                     else:
 473                         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 = ", ";")
 474                     if from_hu_conv is None:
 475                         from_hu_conv = (self.consts.get_ptr(ty_info.var_name), "")
 476                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 477                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 478                         ret_conv = ret_conv, ret_conv_name = "tag_ptr(" + ty_info.var_name + "_conv, true)",
 479                         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 + ")") + ";",
 480                         to_hu_conv_name = ty_info.var_name + "_hu_conv", from_hu_conv = from_hu_conv)
 481                 if ty_info.rust_obj in self.tuple_types:
 482                     ret_conv_name = "tag_ptr(" + ty_info.var_name + "_conv, "
 483                     if holds_ref:
 484                         # If we're trying to return a ref, we have to clone.
 485                         if (ty_info.rust_obj.replace("LDK", "") + "_clone") not in self.clone_fns:
 486                             ret_conv = (ty_info.rust_obj + "* " + ty_info.var_name + "_conv = &", "")
 487                             ret_conv = (ret_conv[0], ";\n// WARNING: we really need to clone here, but no clone is available for " + ty_info.rust_obj)
 488                             ret_conv_name += "false)"
 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 = (ret_conv[0], ret_conv[1] + "\n*" + ty_info.var_name + "_conv = " + ty_info.rust_obj.replace("LDK", "") + "_clone(" + ty_info.var_name + "_conv);")
 492                             ret_conv_name += "true)"
 493                     else:
 494                         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 = ", ";")
 495                         ret_conv_name += "true)"
 496                     if not ty_info.is_ptr or holds_ref:
 497                         to_hu_conv_sfx = "\n" + self.consts.add_ref(ty_info.var_name + "_hu_conv", "this") + ";"
 498                     else:
 499                         to_hu_conv_sfx = ""
 500                     if from_hu_conv is None:
 501                         from_hu_conv = (self.consts.get_ptr(ty_info.var_name), "")
 502                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 503                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 504                         ret_conv = ret_conv, ret_conv_name = ret_conv_name,
 505                         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,
 506                         to_hu_conv_name = ty_info.var_name + "_hu_conv", from_hu_conv = from_hu_conv)
 507
 508                 # The manually-defined types - TxIn, TxOut, BigEndianScalar, U5, and Error
 509                 if ty_info.rust_obj == "LDKError":
 510                     assert from_hu_conv is None
 511                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 512                         arg_conv = "", arg_conv_name = "(LDKError){ ._dummy = 0 }", arg_conv_cleanup = None,
 513                         ret_conv = ("/*", "*/"), ret_conv_name = "0",
 514                         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 + ")") + ";",
 515                         to_hu_conv_name = ty_info.var_name + "_conv", from_hu_conv = ("0", ""))
 516
 517                 if ty_info.rust_obj == "LDKU5" or ty_info.rust_obj == "LDKWitnessVersion":
 518                     assert from_hu_conv is None
 519                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 520                         arg_conv = "", arg_conv_name = "(" + ty_info.rust_obj + "){ ._0 = " + ty_info.var_name + " }", arg_conv_cleanup = None,
 521                         ret_conv = ("uint8_t " + ty_info.var_name + "_val = ", "._0;"), ret_conv_name = ty_info.var_name + "_val",
 522                         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 + ")") + ";",
 523                         to_hu_conv_name = ty_info.var_name + "_conv", from_hu_conv = (ty_info.var_name + ".getVal()", ""))
 524
 525                 assert ty_info.rust_obj == "LDKWitnessProgram" or ty_info.rust_obj == "LDKTxOut" or ty_info.rust_obj == "LDKTxIn" or ty_info.rust_obj == "LDKBigEndianScalar"
 526                 if not ty_info.is_ptr and not holds_ref:
 527                     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 = ", ";")
 528                     ret_conv_name = "tag_ptr(" + ty_info.var_name + "_ref, true)"
 529                 else:
 530                     ret_conv = (ty_info.rust_obj + "* " + ty_info.var_name + "_ref = &", ";")
 531                     ret_conv_name = "tag_ptr(" + ty_info.var_name + "_ref, false)"
 532                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 533                     arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 534                     ret_conv = ret_conv, ret_conv_name = ret_conv_name,
 535                     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 + ")") + ";",
 536                     to_hu_conv_name = ty_info.var_name + "_conv", from_hu_conv = (self.consts.get_ptr(ty_info.var_name), ""))
 537             elif ty_info.is_ptr:
 538                 assert(not is_free)
 539                 if ty_info.rust_obj in self.complex_enums:
 540                     ret_conv = (self.consts.ptr_c_ty + " ref_" + ty_info.var_name + " = tag_ptr(", ", false); // WARNING: We should clone here!")
 541                     from_hu_sfx = self.consts.add_ref("this", ty_info.var_name)
 542                     if ty_info.rust_obj.replace("LDK", "") + "_clone" in self.clone_fns:
 543                         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"
 544                         ret_conv_pfx += "*ret_" + ty_info.var_name + " = " + ty_info.rust_obj.replace("LDK", "") + "_clone("
 545                         ret_conv_sfx = ");\n" + self.consts.ptr_c_ty + " ref_" + ty_info.var_name + " = tag_ptr(ret_" + ty_info.var_name + ", true);"
 546                         ret_conv = (ret_conv_pfx, ret_conv_sfx)
 547                         from_hu_sfx = ""
 548                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 549                         arg_conv = ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)untag_ptr(" + ty_info.var_name + ");",
 550                         arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 551                         ret_conv = ret_conv, ret_conv_name = "ref_" + ty_info.var_name,
 552                         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 + ")") + ";",
 553                         to_hu_conv_name = ty_info.var_name + "_hu_conv",
 554                         from_hu_conv = (self.consts.get_ptr(ty_info.var_name), from_hu_sfx))
 555                 elif ty_info.rust_obj in self.trait_structs:
 556                     if ty_info.nonnull_ptr:
 557                         arg_conv = "void* " + ty_info.var_name + "_ptr = untag_ptr(" + ty_info.var_name + ");\n"
 558                         arg_conv += "if (ptr_is_owned(" + ty_info.var_name + ")) { CHECK_ACCESS(" + ty_info.var_name + "_ptr); }\n"
 559                         arg_conv += ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)" + ty_info.var_name + "_ptr;"
 560                         arg_conv_name = ty_info.var_name + "_conv"
 561                         from_hu_conv_pfx = self.consts.get_ptr(ty_info.var_name)
 562                     else:
 563                         # We map Option<Trait> as *mut Trait, which we can differentiate from &Trait by the NONNULL_PTR annotation.
 564                         # We handle the Option<Trait> case here.
 565                         arg_conv = ty_info.rust_obj + " *" + ty_info.var_name + "_conv_ptr = NULL;\n"
 566                         arg_conv += "if (" + ty_info.var_name + " != 0) {\n"
 567                         arg_conv += "\t" + ty_info.rust_obj + " " + ty_info.var_name + "_conv;\n"
 568                         arg_conv += "void* " + ty_info.var_name + "_ptr = untag_ptr(" + ty_info.var_name + ");\n"
 569                         arg_conv += "CHECK_ACCESS(" + ty_info.var_name + "_ptr);\n"
 570                         arg_conv += "\t" + ty_info.var_name + "_conv = *(" + ty_info.rust_obj + "*)" + ty_info.var_name + "_ptr;"
 571                         arg_conv += self.consts.trait_struct_inc_refcnt(ty_info).replace("\n", "\n\t")
 572                         arg_conv += "\n\t" + ty_info.var_name + "_conv_ptr = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n"
 573                         arg_conv += "\t*" + ty_info.var_name + "_conv_ptr = " + ty_info.var_name + "_conv;\n"
 574                         arg_conv += "}"
 575                         arg_conv_name = ty_info.var_name + "_conv_ptr"
 576                         from_hu_conv_pfx = self.consts.get_ptr(ty_info.var_name)
 577                     if ty_info.rust_obj.replace("LDK", "") + "_clone" in self.clone_fns:
 578                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 579                             arg_conv = arg_conv, arg_conv_name = arg_conv_name, arg_conv_cleanup = None,
 580                             ret_conv = (ty_info.rust_obj + " *" + ty_info.var_name + "_clone = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n" +
 581                                 "*" + ty_info.var_name + "_clone = " + ty_info.rust_obj.replace("LDK", "") + "_clone(", ");"),
 582                             ret_conv_name = "tag_ptr(" + ty_info.var_name + "_clone, true)",
 583                             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") + ";",
 584                             to_hu_conv_name = "ret_hu_conv", from_hu_conv = (from_hu_conv_pfx, ""))
 585                     else:
 586                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 587                             arg_conv = arg_conv, arg_conv_name = arg_conv_name, arg_conv_cleanup = None,
 588                             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);"),
 589                             ret_conv_name = "ret_" + ty_info.var_name,
 590                             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") + ";",
 591                             to_hu_conv_name = "ret_hu_conv", from_hu_conv = (from_hu_conv_pfx, self.consts.add_ref("this", ty_info.var_name)))
 592                 ret_conv = (self.consts.ptr_c_ty + " ret_" + ty_info.var_name + " = tag_ptr(", ", true);")
 593                 if holds_ref:
 594                     ret_conv = (ret_conv[0], ", false);")
 595                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 596                     arg_conv = ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)untag_ptr(" + ty_info.var_name + ");",
 597                     arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 598                     ret_conv = ret_conv, ret_conv_name = "ret_" + ty_info.var_name,
 599                     to_hu_conv = "TODO 3", to_hu_conv_name = None, from_hu_conv = None) # its a pointer, no conv needed
 600             assert False # We should have handled every case by now.