_ 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)
  20         return mapped_info
  21
  22     def map_type_with_info(self, ty_info, print_void, ret_arr_len, is_free, holds_ref):
  23         if ty_info.c_ty == "void":
  24             if not print_void:
  25                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
  26                     arg_conv = None, arg_conv_name = None, arg_conv_cleanup = None,
  27                     ret_conv = None, ret_conv_name = None, to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
  28         if ty_info.c_ty.endswith("Array"):
  29             arr_len = ty_info.arr_len
  30             if arr_len is not None:
  31                 arr_name = ty_info.var_name
  32             else:
  33                 arr_name = "ret"
  34                 arr_len = ret_arr_len
  35             if ty_info.c_ty == "int8_tArray":
  36                 (set_pfx, set_sfx) = self.consts.set_native_arr_contents(arr_name + "_arr", arr_len, ty_info)
  37                 ret_conv = ("int8_tArray " + arr_name + "_arr = " + self.consts.create_native_arr_call(arr_len, ty_info) + ";\n" + set_pfx, "")
  38                 arg_conv_cleanup = None
  39                 if not arr_len.isdigit():
  40                     arg_conv = ty_info.rust_obj + " " + arr_name + "_ref;\n"
  41                     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"
  42                     if (not ty_info.is_ptr or not holds_ref) and ty_info.rust_obj != "LDKu8slice":
  43                         arg_conv = arg_conv + arr_name + "_ref." + ty_info.arr_access + " = MALLOC(" + arr_name + "_ref." + arr_len + ", \"" + ty_info.rust_obj + " Bytes\");\n"
  44                         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) + ";"
  45                     else:
  46                         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) + ";"
  47                         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)
  48                     if ty_info.rust_obj == "LDKTransaction":
  49                         arg_conv = arg_conv + "\n" + arr_name + "_ref.data_is_owned = " + str(holds_ref).lower() + ";"
  50                     ret_conv = (ty_info.rust_obj + " " + arr_name + "_var = ", "")
  51                     ret_conv = (ret_conv[0], ";\nint8_tArray " + arr_name + "_arr = " + self.consts.create_native_arr_call(arr_name + "_var." + arr_len, ty_info) + ";\n")
  52                     (pfx, sfx) = self.consts.set_native_arr_contents(arr_name + "_arr", arr_name + "_var." + arr_len, ty_info)
  53                     ret_conv = (ret_conv[0], ret_conv[1] + pfx + arr_name + "_var." + ty_info.arr_access + sfx + ";")
  54                     if not holds_ref and ty_info.rust_obj != "LDKu8slice":
  55                         ret_conv = (ret_conv[0], ret_conv[1] + "\n" + ty_info.rust_obj.replace("LDK", "") + "_free(" + arr_name + "_var);")
  56                 elif ty_info.rust_obj is not None:
  57                     arg_conv = ty_info.rust_obj + " " + arr_name + "_ref;\n"
  58                     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"
  59                     arg_conv = arg_conv + self.consts.get_native_arr_contents(arr_name, arr_name + "_ref." + ty_info.arr_access, arr_len, ty_info, True) + ";"
  60                     ret_conv = (ret_conv[0], "." + ty_info.arr_access + set_sfx + ";")
  61                 else:
  62                     arg_conv = "unsigned char " + arr_name + "_arr[" + arr_len + "];\n"
  63                     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"
  64                     arg_conv = arg_conv + self.consts.get_native_arr_contents(arr_name, arr_name + "_arr", arr_len, ty_info, True) + ";\n"
  65                     arg_conv = arg_conv + "unsigned char (*" + arr_name + "_ref)[" + arr_len + "] = &" + arr_name + "_arr;"
  66                     ret_conv = (ret_conv[0] + "*", set_sfx + ";")
  67                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
  68                     arg_conv = arg_conv, arg_conv_name = arr_name + "_ref", arg_conv_cleanup = arg_conv_cleanup,
  69                     ret_conv = ret_conv, ret_conv_name = arr_name + "_arr", to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
  70             else:
  71                 assert not arr_len.isdigit() # fixed length arrays not implemented
  72                 assert ty_info.java_ty[len(ty_info.java_ty) - 2:] == "[]"
  73                 conv_name = "arr_conv_" + str(len(ty_info.java_hu_ty))
  74                 idxc = chr(ord('a') + (len(ty_info.java_hu_ty) % 26))
  75                 ty_info.subty.var_name = conv_name
  76                 #XXX: We'd really prefer to only ever set to False, avoiding lots of clone, but need smarter free logic
  77                 #if ty_info.is_ptr or holds_ref:
  78                 #    ty_info.subty.requires_clone = False
  79                 ty_info.subty.requires_clone = not ty_info.is_ptr or not holds_ref
  80                 subty = self.map_type_with_info(ty_info.subty, False, None, is_free, holds_ref)
  81                 if arr_name == "":
  82                     arr_name = "arg"
  83                 arg_conv = ty_info.rust_obj + " " + arr_name + "_constr;\n"
  84                 arg_conv = arg_conv + arr_name + "_constr." + arr_len + " = " + self.consts.get_native_arr_len_call[0] + arr_name + self.consts.get_native_arr_len_call[1] + ";\n"
  85                 arg_conv = arg_conv + "if (" + arr_name + "_constr." + arr_len + " > 0)\n"
  86                 if subty.rust_obj is None:
  87                     szof = subty.c_ty
  88                 else:
  89                     szof = subty.rust_obj
  90                 arg_conv = arg_conv + "\t" + arr_name + "_constr." + ty_info.arr_access + " = MALLOC(" + arr_name + "_constr." + arr_len + " * sizeof(" + szof + "), \"" + ty_info.rust_obj + " Elements\");\n"
  91                 arg_conv = arg_conv + "else\n"
  92                 arg_conv = arg_conv + "\t" + arr_name + "_constr." + ty_info.arr_access + " = NULL;\n"
  93                 get_arr = self.consts.get_native_arr_contents(arr_name, "NO_DEST", arr_name + "_constr." + arr_len, ty_info, False)
  94                 if get_arr != None:
  95                     arg_conv = arg_conv + subty.c_ty + "* " + arr_name + "_vals = " + get_arr + ";\n"
  96                 arg_conv = arg_conv + "for (size_t " + idxc + " = 0; " + idxc + " < " + arr_name + "_constr." + arr_len + "; " + idxc + "++) {\n"
  97                 if get_arr != None:
  98                     arg_conv = arg_conv + "\t" + subty.c_ty + " " + conv_name + " = " + arr_name + "_vals[" + idxc + "];"
  99                     if subty.arg_conv is not None:
 100                         arg_conv = arg_conv + "\n\t" + subty.arg_conv.replace("\n", "\n\t")
 101                 else:
 102                     arg_conv = arg_conv + "\t" + subty.c_ty + " " + conv_name + " = " + self.consts.get_native_arr_elem(arr_name, idxc, ty_info) + ";\n"
 103                     arg_conv = arg_conv + "\t" + subty.arg_conv.replace("\n", "\n\t")
 104                 arg_conv = arg_conv + "\n\t" + arr_name + "_constr." + ty_info.arr_access + "[" + idxc + "] = " + subty.arg_conv_name + ";\n}"
 105                 if get_arr != None:
 106                     cleanup = self.consts.cleanup_native_arr_ref_contents(arr_name, arr_name + "_vals", arr_name + "_constr." + arr_len, ty_info)
 107                     if cleanup is not None:
 108                         arg_conv = arg_conv + "\n" + cleanup + ";"
 109                 if ty_info.is_ptr:
 110                     arg_conv_name = "&" + arr_name + "_constr"
 111                 else:
 112                     arg_conv_name = arr_name + "_constr"
 113                 arg_conv_cleanup = None
 114                 if ty_info.is_ptr:
 115                     arg_conv_cleanup = "FREE(" + arr_name + "_constr." + ty_info.arr_access + ");"
 116
 117                 if arr_name == "arg":
 118                     arr_name = "ret"
 119                 ret_conv = (ty_info.rust_obj + " " + arr_name + "_var = ", "")
 120                 if subty.ret_conv is None:
 121                     ret_conv = ("DUMMY", "DUMMY")
 122                 else:
 123                     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")
 124                     get_ptr_call = self.consts.get_native_arr_ptr_call(ty_info)
 125                     if get_ptr_call is not None:
 126                         ret_conv = (ret_conv[0], ret_conv[1] + subty.c_ty + " *" + arr_name + "_arr_ptr = " + get_ptr_call[0] + arr_name + "_arr" + get_ptr_call[1] + ";\n")
 127                     ret_conv = (ret_conv[0], ret_conv[1] + "for (size_t " + idxc + " = 0; " + idxc + " < " + arr_name + "_var." + arr_len + "; " + idxc + "++) {\n")
 128                     ret_conv = (ret_conv[0], ret_conv[1] + "\t" + subty.ret_conv[0].replace("\n", "\n\t"))
 129                     ret_conv = (ret_conv[0], ret_conv[1] + arr_name + "_var." + ty_info.arr_access + "[" + idxc + "]" + subty.ret_conv[1].replace("\n", "\n\t"))
 130                     if get_ptr_call is not None:
 131                         ret_conv = (ret_conv[0], ret_conv[1] + "\n\t" + arr_name + "_arr_ptr[" + idxc + "] = " + subty.ret_conv_name + ";\n}")
 132                     else:
 133                         ret_conv = (ret_conv[0], ret_conv[1] + "\n\t" + self.consts.get_native_arr_entry_call(ty_info, arr_name + "_arr", idxc, subty.ret_conv_name) + ";\n}")
 134                     cleanup = self.consts.release_native_arr_ptr_call(ty_info, arr_name + "_arr", arr_name + "_arr_ptr")
 135                     if cleanup is not None:
 136                         ret_conv = (ret_conv[0], ret_conv[1] + "\n" + cleanup + ";")
 137                 if not holds_ref:
 138                     # XXX: The commented if's are a bit smarter freeing, but we need to be a nudge smarter still
 139                     # Note that we don't drop the full vec here - we're passing ownership to java (or have cloned) or free'd by now!
 140                     ret_conv = (ret_conv[0], ret_conv[1] + "\nFREE(" + arr_name + "_var." + ty_info.arr_access + ");")
 141                     #if subty.rust_obj is not None and subty.rust_obj in self.opaque_structs:
 142                     #    ret_conv = (ret_conv[0], ret_conv[1] + "\nFREE(" + arr_name + "_var." + ty_info.arr_access + ");")
 143                     #else:
 144                     #    ret_conv = (ret_conv[0], ret_conv[1] + "\n" + ty_info.rust_obj.replace("LDK", "") + "_free(" + arr_name + "_var);")
 145
 146                 to_hu_conv = None
 147                 to_hu_conv_name = None
 148                 if subty.to_hu_conv is not None:
 149                     to_hu_conv = ty_info.java_hu_ty + " " + conv_name + "_arr = new " + ty_info.subty.java_hu_ty.split("<")[0] + "[" + arr_name + ".length];\n"
 150                     to_hu_conv = to_hu_conv + "for (int " + idxc + " = 0; " + idxc + " < " + arr_name + ".length; " + idxc + "++) {\n"
 151                     to_hu_conv = to_hu_conv + "\t" + subty.java_ty + " " + conv_name + " = " + arr_name + "[" + idxc + "];\n"
 152                     to_hu_conv = to_hu_conv + "\t" + subty.to_hu_conv.replace("\n", "\n\t") + "\n"
 153                     to_hu_conv = to_hu_conv + "\t" + conv_name + "_arr[" + idxc + "] = " + subty.to_hu_conv_name + ";\n}"
 154                     to_hu_conv_name = conv_name + "_arr"
 155                 from_hu_conv = None
 156                 if subty.from_hu_conv is not None:
 157                     if subty.java_ty == "long" and subty.java_hu_ty != "long":
 158                         from_hu_conv = ("Arrays.stream(" + arr_name + ").mapToLong(" + conv_name + " -> " + subty.from_hu_conv[0] + ").toArray()", "/* TODO 2 " + subty.java_hu_ty + "  */")
 159                     elif subty.java_ty == "long":
 160                         from_hu_conv = ("Arrays.stream(" + arr_name + ").map(" + conv_name + " -> " + subty.from_hu_conv[0] + ").toArray()", "/* TODO 2 " + subty.java_hu_ty + "  */")
 161                     else:
 162                         from_hu_conv = ("(" + ty_info.java_ty + ")Arrays.stream(" + arr_name + ").map(" + conv_name + " -> " + subty.from_hu_conv[0] + ").toArray()", "/* TODO 2 " + subty.java_hu_ty + "  */")
 163
 164                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 165                     arg_conv = arg_conv, arg_conv_name = arg_conv_name, arg_conv_cleanup = arg_conv_cleanup,
 166                     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)
 167         elif ty_info.java_ty == "String":
 168             if ty_info.arr_access is None:
 169                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 170                     arg_conv = None, arg_conv_name = None, arg_conv_cleanup = None,
 171                     ret_conv = ("jstring " + ty_info.var_name + "_conv = " + self.consts.owned_str_to_c_call[0], self.consts.owned_str_to_c_call[1] + ";"), ret_conv_name = ty_info.var_name + "_conv",
 172                     to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 173             else:
 174                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 175                     arg_conv = None, arg_conv_name = None, arg_conv_cleanup = None,
 176                     ret_conv = ("LDKStr " + ty_info.var_name + "_str = ",
 177                         ";\nchar* " + ty_info.var_name + "_buf = MALLOC(" + ty_info.var_name + "_str." + ty_info.arr_len + " + 1, \"str conv buf\");\n" +
 178                         "memcpy(" + ty_info.var_name + "_buf, " + ty_info.var_name + "_str." + ty_info.arr_access + ", " + ty_info.var_name + "_str." + ty_info.arr_len + ");\n" +
 179                         ty_info.var_name + "_buf[" + ty_info.var_name + "_str." + ty_info.arr_len + "] = 0;\n" +
 180                         "jstring " + ty_info.var_name + "_conv = " + self.consts.owned_str_to_c_call[0] + ty_info.var_name + "_str." + ty_info.arr_access + self.consts.owned_str_to_c_call[1] + ";\n" +
 181                         "FREE(" + ty_info.var_name + "_buf);"),
 182                     ret_conv_name = ty_info.var_name + "_conv", to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 183         elif ty_info.var_name == "" and not print_void:
 184             # We don't have a parameter name, and want one, just call it arg
 185             if ty_info.rust_obj is not None:
 186                 assert(not is_free or ty_info.rust_obj not in self.opaque_structs)
 187                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 188                     arg_conv = ty_info.rust_obj + " arg_conv = *(" + ty_info.rust_obj + "*)arg;\nFREE((void*)arg);",
 189                     arg_conv_name = "arg_conv", arg_conv_cleanup = None,
 190                     ret_conv = None, ret_conv_name = None, to_hu_conv = "TODO 7", to_hu_conv_name = None, from_hu_conv = None)
 191             else:
 192                 assert(not is_free)
 193                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 194                     arg_conv = None, arg_conv_name = "arg", arg_conv_cleanup = None,
 195                     ret_conv = None, ret_conv_name = None, to_hu_conv = "TODO 8", to_hu_conv_name = None, from_hu_conv = None)
 196         elif ty_info.rust_obj is None:
 197             return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 198                 arg_conv = None, arg_conv_name = ty_info.var_name, arg_conv_cleanup = None,
 199                 ret_conv = None, ret_conv_name = None, to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 200         else:
 201             if ty_info.var_name == "":
 202                 ty_info.var_name = "ret"
 203
 204             if ty_info.rust_obj in self.opaque_structs:
 205                 opaque_arg_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv;\n"
 206                 opaque_arg_conv = opaque_arg_conv + ty_info.var_name + "_conv.inner = (void*)(" + ty_info.var_name + " & (~1));\n"
 207                 if ty_info.is_ptr and holds_ref:
 208                     opaque_arg_conv = opaque_arg_conv + ty_info.var_name + "_conv.is_owned = false;"
 209                 else:
 210                     opaque_arg_conv = opaque_arg_conv + ty_info.var_name + "_conv.is_owned = (" + ty_info.var_name + " & 1) || (" + ty_info.var_name + " == 0);"
 211                 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:
 212                     if (ty_info.rust_obj.replace("LDK", "") + "_clone") in self.clone_fns:
 213                         # 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.
 214                         opaque_arg_conv = opaque_arg_conv + "\nif (" + ty_info.var_name + "_conv.inner != NULL)\n"
 215                         opaque_arg_conv = opaque_arg_conv + "\t" + ty_info.var_name + "_conv = " + ty_info.rust_obj.replace("LDK", "") + "_clone(&" + ty_info.var_name + "_conv);"
 216                     elif ty_info.passed_as_ptr:
 217                         opaque_arg_conv = opaque_arg_conv + "\n// Warning: we may need a move here but can't clone!"
 218
 219                 opaque_ret_conv_suf = ";\n"
 220                 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
 221                     opaque_ret_conv_suf = opaque_ret_conv_suf + "if (" + ty_info.var_name + "->inner != NULL)\n"
 222                     opaque_ret_conv_suf = opaque_ret_conv_suf + "\t" + ty_info.var_name + "_var = " + ty_info.rust_obj.replace("LDK", "") + "_clone(" + ty_info.var_name + ");\n"
 223                 elif not holds_ref and ty_info.is_ptr:
 224                     opaque_ret_conv_suf = opaque_ret_conv_suf + "// Warning: we may need a move here but can't clone!\n"
 225
 226                 opaque_ret_conv_suf = opaque_ret_conv_suf + "CHECK((((long)" + ty_info.var_name + "_var.inner) & 1) == 0); // We rely on a free low bit, malloc guarantees this.\n"
 227                 opaque_ret_conv_suf = opaque_ret_conv_suf + "CHECK((((long)&" + ty_info.var_name + "_var) & 1) == 0); // We rely on a free low bit, pointer alignment guarantees this.\n"
 228                 if holds_ref:
 229                     opaque_ret_conv_suf = opaque_ret_conv_suf + "long " + ty_info.var_name + "_ref = (long)" + ty_info.var_name + "_var.inner & ~1;"
 230                 else:
 231                     opaque_ret_conv_suf = opaque_ret_conv_suf + "long " + ty_info.var_name + "_ref = (long)" + ty_info.var_name + "_var.inner;\n"
 232                     opaque_ret_conv_suf = opaque_ret_conv_suf + "if (" + ty_info.var_name + "_var.is_owned) {\n"
 233                     opaque_ret_conv_suf = opaque_ret_conv_suf + "\t" + ty_info.var_name + "_ref |= 1;\n"
 234                     opaque_ret_conv_suf = opaque_ret_conv_suf + "}"
 235
 236                 if ty_info.is_ptr:
 237                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 238                         arg_conv = opaque_arg_conv, arg_conv_name = "&" + ty_info.var_name + "_conv", arg_conv_cleanup = None,
 239                         ret_conv = (ty_info.rust_obj + " " + ty_info.var_name + "_var = *", opaque_ret_conv_suf),
 240                         ret_conv_name = ty_info.var_name + "_ref",
 241                         to_hu_conv = self.consts.to_hu_conv_templates['ptr'].replace('{human_type}', ty_info.java_hu_ty).replace('{var_name}', ty_info.var_name),
 242                         to_hu_conv_name = ty_info.var_name + "_hu_conv",
 243                         from_hu_conv = (ty_info.var_name + " == null ? 0 : " + ty_info.var_name + ".ptr & ~1", "this.ptrs_to.add(" + ty_info.var_name + ")"))
 244                 else:
 245                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 246                         arg_conv = opaque_arg_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 247                         ret_conv = (ty_info.rust_obj + " " + ty_info.var_name + "_var = ", opaque_ret_conv_suf),
 248                         ret_conv_name = ty_info.var_name + "_ref",
 249                         to_hu_conv = self.consts.to_hu_conv_templates['default'].replace('{human_type}', ty_info.java_hu_ty).replace('{var_name}', ty_info.var_name),
 250                         to_hu_conv_name = ty_info.var_name + "_hu_conv",
 251                         from_hu_conv = (ty_info.var_name + " == null ? 0 : " + ty_info.var_name + ".ptr & ~1", "this.ptrs_to.add(" + ty_info.var_name + ")"))
 252
 253             if not ty_info.is_ptr:
 254                 if ty_info.rust_obj in self.unitary_enums:
 255                     (ret_pfx, ret_sfx) = self.consts.c_unitary_enum_to_native_call(ty_info)
 256                     (arg_pfx, arg_sfx) = self.consts.native_unitary_enum_to_c_call(ty_info)
 257                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 258                         arg_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv = " + arg_pfx + ty_info.var_name + arg_sfx + ";",
 259                         arg_conv_name = ty_info.var_name + "_conv",
 260                         arg_conv_cleanup = None,
 261                         ret_conv = (ty_info.c_ty + " " + ty_info.var_name + "_conv = " + ret_pfx, ret_sfx + ";"),
 262                         ret_conv_name = ty_info.var_name + "_conv", to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 263                 base_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv = *(" + ty_info.rust_obj + "*)" + ty_info.var_name + ";"
 264                 if ty_info.rust_obj in self.trait_structs:
 265                     if not is_free:
 266                         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
 267                         if needs_full_clone and (ty_info.rust_obj.replace("LDK", "") + "_clone") in self.clone_fns:
 268                             base_conv = base_conv + "\n" + ty_info.var_name + "_conv = " + ty_info.rust_obj.replace("LDK", "") + "_clone(" + ty_info.var_name + ");"
 269                         else:
 270                             base_conv = base_conv + self.consts.trait_struct_inc_refcnt(ty_info)
 271                             if needs_full_clone:
 272                                 base_conv = base_conv + "// Warning: we may need a move here but can't do a full clone!\n"
 273
 274                     else:
 275                         base_conv = base_conv + "\n" + "FREE((void*)" + ty_info.var_name + ");"
 276                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 277                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 278                         ret_conv = (ty_info.rust_obj + "* ret = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n*ret = ", ";"),
 279                         ret_conv_name = "(long)ret",
 280                         to_hu_conv = ty_info.java_hu_ty + " ret_hu_conv = new " + ty_info.java_hu_ty + "(null, " + ty_info.var_name + ");\nret_hu_conv.ptrs_to.add(this);",
 281                         to_hu_conv_name = "ret_hu_conv",
 282                         from_hu_conv = (ty_info.var_name + " == null ? 0 : " + ty_info.var_name + ".ptr", "this.ptrs_to.add(" + ty_info.var_name + ")"))
 283                 if ty_info.rust_obj != "LDKu8slice":
 284                     # Don't bother free'ing slices passed in - Rust doesn't auto-free the
 285                     # underlying unlike Vecs, and it gives Java more freedom.
 286                     base_conv = base_conv + "\nFREE((void*)" + ty_info.var_name + ");";
 287                 if ty_info.rust_obj in self.complex_enums:
 288                     ret_conv = ("long " + ty_info.var_name + "_ref = (long)&", ";")
 289                     if not holds_ref:
 290                         ret_conv = (ty_info.rust_obj + " *" + ty_info.var_name + "_copy = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n", "")
 291                         if ty_info.requires_clone == True: # Set in object array mapping
 292                             if (ty_info.rust_obj.replace("LDK", "") + "_clone") in self.clone_fns:
 293                                 ret_conv = (ret_conv[0] + "*" + ty_info.var_name + "_copy = " + ty_info.rust_obj.replace("LDK", "") + "_clone(&", ");\n")
 294                             else:
 295                                 ret_conv = (ret_conv[0] + "*" + ty_info.var_name + "_copy = ", "; // XXX: We likely need to clone here, but no _clone fn is available!\n")
 296                         else:
 297                             ret_conv = (ret_conv[0] + "*" + ty_info.var_name + "_copy = ", ";\n")
 298                         ret_conv = (ret_conv[0], ret_conv[1] + "long " + ty_info.var_name + "_ref = (long)" + ty_info.var_name + "_copy;")
 299                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 300                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 301                         ret_conv = ret_conv, ret_conv_name = ty_info.var_name + "_ref",
 302                         to_hu_conv = ty_info.java_hu_ty + " " + ty_info.var_name + "_hu_conv = " + ty_info.java_hu_ty + ".constr_from_ptr(" + ty_info.var_name + ");\n" + ty_info.var_name + "_hu_conv.ptrs_to.add(this);",
 303                         to_hu_conv_name = ty_info.var_name + "_hu_conv", from_hu_conv = (ty_info.var_name + ".ptr", ""))
 304                 if ty_info.rust_obj in self.result_types:
 305                     if holds_ref:
 306                         # If we're trying to return a ref, we have to clone.
 307                         # We just blindly assume its implemented and let the compiler fail if its not.
 308                         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 = ", ";")
 309                         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);")
 310                     else:
 311                         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 = ", ";")
 312                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 313                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 314                         ret_conv = ret_conv, ret_conv_name = "(long)" + ty_info.var_name + "_conv",
 315                         to_hu_conv = ty_info.java_hu_ty + " " + ty_info.var_name + "_hu_conv = " + ty_info.java_hu_ty + ".constr_from_ptr(" + ty_info.var_name + ");",
 316                         to_hu_conv_name = ty_info.var_name + "_hu_conv", from_hu_conv = (ty_info.var_name + " != null ? " + ty_info.var_name + ".ptr : 0", ""))
 317                 if ty_info.rust_obj in self.tuple_types:
 318                     from_hu_conv = "bindings." + self.tuple_types[ty_info.rust_obj][1].replace("LDK", "") + "_new("
 319                     to_hu_conv_pfx = ""
 320                     to_hu_conv_sfx = ty_info.java_hu_ty + " " + ty_info.var_name + "_conv = new " + ty_info.java_hu_ty + "("
 321                     clone_ret_str = ""
 322                     for idx, conv in enumerate(self.tuple_types[ty_info.rust_obj][0]):
 323                         if idx != 0:
 324                             to_hu_conv_sfx = to_hu_conv_sfx + ", "
 325                             from_hu_conv = from_hu_conv + ", "
 326                         conv.var_name = ty_info.var_name + "_" + chr(idx + ord("a"))
 327                         conv_map = self.map_type_with_info(conv, False, None, is_free, holds_ref)
 328                         to_hu_conv_pfx = to_hu_conv_pfx + conv.java_ty + " " + ty_info.var_name + "_" + chr(idx + ord("a")) + " = " + "bindings." + self.tuple_types[ty_info.rust_obj][1] + "_get_" + chr(idx + ord("a")) + "(" + ty_info.var_name + ");\n"
 329                         if conv_map.to_hu_conv is not None:
 330                             to_hu_conv_pfx = to_hu_conv_pfx + conv_map.to_hu_conv + ";\n"
 331                             to_hu_conv_sfx = to_hu_conv_sfx + conv_map.to_hu_conv_name
 332                         else:
 333                             to_hu_conv_sfx = to_hu_conv_sfx + ty_info.var_name + "_" + chr(idx + ord("a"))
 334                         if conv_map.from_hu_conv is not None:
 335                             from_hu_conv = from_hu_conv + conv_map.from_hu_conv[0].replace(ty_info.var_name + "_" + chr(idx + ord("a")), ty_info.var_name + "." + chr(idx + ord("a")))
 336                             if conv_map.from_hu_conv[1] != "":
 337                                 from_hu_conv = from_hu_conv + "/*XXX: " + conv_map.from_hu_conv[1] + "*/"
 338                         else:
 339                             from_hu_conv = from_hu_conv + ty_info.var_name + "." + chr(idx + ord("a"))
 340
 341                         if conv.is_native_primitive:
 342                             pass
 343                         elif (conv_map.rust_obj.replace("LDK", "") + "_clone") in self.clone_fns:
 344                             accessor = ty_info.var_name + "_ref->" + chr(idx + ord("a"))
 345                             clone_ret_str = clone_ret_str + "\n" + accessor + " = " + conv_map.rust_obj.replace("LDK", "") + "_clone(&" + accessor + ");"
 346                         else:
 347                             clone_ret_str = clone_ret_str + "\n// XXX: We likely need to clone here, but no _clone fn is available for " + conv_map.java_hu_ty
 348                     if not ty_info.is_ptr and not holds_ref:
 349                         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 = ", ";")
 350                         if 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:
 351                             ret_conv = (ret_conv[0], ret_conv[1] + clone_ret_str)
 352                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 353                             arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 354                             ret_conv = ret_conv,
 355                             ret_conv_name = "(long)" + ty_info.var_name + "_ref",
 356                             to_hu_conv = to_hu_conv_pfx + to_hu_conv_sfx + ");", to_hu_conv_name = ty_info.var_name + "_conv", from_hu_conv = (from_hu_conv + ")", ""))
 357                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 358                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 359                         ret_conv = ("long " + ty_info.var_name + "_ref = (long)&", ";"), ret_conv_name = ty_info.var_name + "_ref",
 360                         to_hu_conv = to_hu_conv_pfx + to_hu_conv_sfx + ");", to_hu_conv_name = ty_info.var_name + "_conv", from_hu_conv = (from_hu_conv + ")", ""))
 361
 362                 # The manually-defined types - TxOut and Transaction
 363                 assert ty_info.rust_obj == "LDKTxOut"
 364                 if not ty_info.is_ptr and not holds_ref:
 365                     ret_conv = ("LDKTxOut* " + ty_info.var_name + "_ref = MALLOC(sizeof(LDKTxOut), \"LDKTxOut\");\n*" + ty_info.var_name + "_ref = ", ";")
 366                 else:
 367                     ret_conv = ("long " + ty_info.var_name + "_ref = (long)&", ";")
 368                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 369                     arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 370                     ret_conv = ret_conv, ret_conv_name = "(long)" + ty_info.var_name + "_ref",
 371                     to_hu_conv = ty_info.java_hu_ty + " " + ty_info.var_name + "_conv = new " +ty_info.java_hu_ty + "(null, " + ty_info.var_name + ");",
 372                     to_hu_conv_name = ty_info.var_name + "_conv", from_hu_conv = (ty_info.var_name + ".ptr", ""))
 373             elif ty_info.is_ptr:
 374                 assert(not is_free)
 375                 if ty_info.rust_obj in self.complex_enums:
 376                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 377                         arg_conv = ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)" + ty_info.var_name + ";",
 378                         arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 379                         ret_conv = ("long ret_" + ty_info.var_name + " = (long)", ";"), ret_conv_name = "ret_" + ty_info.var_name,
 380                         to_hu_conv = ty_info.java_hu_ty + " " + ty_info.var_name + "_hu_conv = " + ty_info.java_hu_ty + ".constr_from_ptr(" + ty_info.var_name + ");",
 381                         to_hu_conv_name = ty_info.var_name + "_hu_conv",
 382                         from_hu_conv = (ty_info.var_name + " == null ? 0 : " + ty_info.var_name + ".ptr & ~1", "this.ptrs_to.add(" + ty_info.var_name + ")"))
 383                 elif ty_info.rust_obj in self.trait_structs:
 384                     if ty_info.rust_obj.replace("LDK", "") + "_clone" in self.clone_fns:
 385                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 386                             arg_conv = ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)" + ty_info.var_name + ";",
 387                             arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 388                             ret_conv = (ty_info.rust_obj + " *" + ty_info.var_name + "_clone = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n" +
 389                                 "*" + ty_info.var_name + "_clone = " + ty_info.rust_obj.replace("LDK", "") + "_clone(", ");"),
 390                             ret_conv_name = "(long)" + ty_info.var_name + "_clone",
 391                             to_hu_conv = ty_info.java_hu_ty + " ret_hu_conv = new " + ty_info.java_hu_ty + "(null, " + ty_info.var_name + ");\nret_hu_conv.ptrs_to.add(this);",
 392                             to_hu_conv_name = "ret_hu_conv",
 393                             from_hu_conv = (ty_info.var_name + " == null ? 0 : " + ty_info.var_name + ".ptr", "this.ptrs_to.add(" + ty_info.var_name + ")"))
 394                     else:
 395                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 396                             arg_conv = ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)" + ty_info.var_name + ";",
 397                             arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 398                             ret_conv = ("long ret_" + ty_info.var_name + " = (long)", ";"), ret_conv_name = "ret_" + ty_info.var_name,
 399                             to_hu_conv = ty_info.java_hu_ty + " ret_hu_conv = new " + ty_info.java_hu_ty + "(null, " + ty_info.var_name + ");\nret_hu_conv.ptrs_to.add(this);",
 400                             to_hu_conv_name = "ret_hu_conv",
 401                             from_hu_conv = (ty_info.var_name + " == null ? 0 : " + ty_info.var_name + ".ptr", "this.ptrs_to.add(" + ty_info.var_name + ")"))
 402                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 403                     arg_conv = ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)" + ty_info.var_name + ";",
 404                     arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 405                     ret_conv = ("long ret_" + ty_info.var_name + " = (long)", ";"), ret_conv_name = "ret_" + ty_info.var_name,
 406                     to_hu_conv = "TODO 3", to_hu_conv_name = None, from_hu_conv = None) # its a pointer, no conv needed
 407             assert False # We should have handled every case by now.