_ 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                 if not ty_info.subty.is_native_primitive and ty_info.subty.rust_obj == "LDKChannelMonitor":
  81                     # We take a Vec of references to ChannelMonitors as input to ChannelManagerReadArgs, if we clone them,
  82                     # we end up freeing the clones after creating the ChannelManagerReadArgs before calling the read
  83                     # function itself, resulting in a segfault. Thus, we manually check and ensure we don't clone for
  84                     # ChannelMonitors inside of vecs.
  85                     ty_info.subty.requires_clone = False
  86                 subty = self.map_type_with_info(ty_info.subty, False, None, is_free, holds_ref)
  87                 if arr_name == "":
  88                     arr_name = "arg"
  89                 arg_conv = ty_info.rust_obj + " " + arr_name + "_constr;\n"
  90                 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"
  91                 arg_conv = arg_conv + "if (" + arr_name + "_constr." + arr_len + " > 0)\n"
  92                 if subty.is_native_primitive:
  93                     szof = subty.c_ty
  94                 else:
  95                     szof = subty.rust_obj
  96                 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"
  97                 arg_conv = arg_conv + "else\n"
  98                 arg_conv = arg_conv + "\t" + arr_name + "_constr." + ty_info.arr_access + " = NULL;\n"
  99                 get_arr = self.consts.get_native_arr_contents(arr_name, "NO_DEST", arr_name + "_constr." + arr_len, ty_info, False)
 100                 if get_arr != None:
 101                     arg_conv = arg_conv + subty.c_ty + "* " + arr_name + "_vals = " + get_arr + ";\n"
 102                 arg_conv = arg_conv + "for (size_t " + idxc + " = 0; " + idxc + " < " + arr_name + "_constr." + arr_len + "; " + idxc + "++) {\n"
 103                 if get_arr != None:
 104                     arg_conv = arg_conv + "\t" + subty.c_ty + " " + conv_name + " = " + arr_name + "_vals[" + idxc + "];"
 105                     if subty.arg_conv is not None:
 106                         arg_conv = arg_conv + "\n\t" + subty.arg_conv.replace("\n", "\n\t")
 107                 else:
 108                     arg_conv = arg_conv + "\t" + subty.c_ty + " " + conv_name + " = " + self.consts.get_native_arr_elem(arr_name, idxc, ty_info) + ";\n"
 109                     arg_conv = arg_conv + "\t" + subty.arg_conv.replace("\n", "\n\t")
 110                 arg_conv = arg_conv + "\n\t" + arr_name + "_constr." + ty_info.arr_access + "[" + idxc + "] = " + subty.arg_conv_name + ";\n}"
 111                 if get_arr != None:
 112                     cleanup = self.consts.cleanup_native_arr_ref_contents(arr_name, arr_name + "_vals", arr_name + "_constr." + arr_len, ty_info)
 113                     if cleanup is not None:
 114                         arg_conv = arg_conv + "\n" + cleanup + ";"
 115                 if ty_info.is_ptr:
 116                     arg_conv_name = "&" + arr_name + "_constr"
 117                 else:
 118                     arg_conv_name = arr_name + "_constr"
 119                 arg_conv_cleanup = None
 120                 if ty_info.is_ptr:
 121                     arg_conv_cleanup = "FREE(" + arr_name + "_constr." + ty_info.arr_access + ");"
 122
 123                 if arr_name == "arg":
 124                     arr_name = "ret"
 125                 ret_conv = (ty_info.rust_obj + " " + arr_name + "_var = ", "")
 126                 if subty.ret_conv is None:
 127                     ret_conv = ("DUMMY", "DUMMY")
 128                 else:
 129                     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")
 130                     get_ptr_call = self.consts.get_native_arr_ptr_call(ty_info)
 131                     if get_ptr_call is not None:
 132                         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")
 133                     ret_conv = (ret_conv[0], ret_conv[1] + "for (size_t " + idxc + " = 0; " + idxc + " < " + arr_name + "_var." + arr_len + "; " + idxc + "++) {\n")
 134                     ret_conv = (ret_conv[0], ret_conv[1] + "\t" + subty.ret_conv[0].replace("\n", "\n\t"))
 135                     ret_conv = (ret_conv[0], ret_conv[1] + arr_name + "_var." + ty_info.arr_access + "[" + idxc + "]" + subty.ret_conv[1].replace("\n", "\n\t"))
 136                     if get_ptr_call is not None:
 137                         ret_conv = (ret_conv[0], ret_conv[1] + "\n\t" + arr_name + "_arr_ptr[" + idxc + "] = " + subty.ret_conv_name + ";\n}")
 138                     else:
 139                         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}")
 140                     cleanup = self.consts.release_native_arr_ptr_call(ty_info, arr_name + "_arr", arr_name + "_arr_ptr")
 141                     if cleanup is not None:
 142                         ret_conv = (ret_conv[0], ret_conv[1] + "\n" + cleanup + ";")
 143                 if not holds_ref:
 144                     # XXX: The commented if's are a bit smarter freeing, but we need to be a nudge smarter still
 145                     # Note that we don't drop the full vec here - we're passing ownership to java (or have cloned) or free'd by now!
 146                     ret_conv = (ret_conv[0], ret_conv[1] + "\nFREE(" + arr_name + "_var." + ty_info.arr_access + ");")
 147                     #if subty.rust_obj is not None and subty.rust_obj in self.opaque_structs:
 148                     #    ret_conv = (ret_conv[0], ret_conv[1] + "\nFREE(" + arr_name + "_var." + ty_info.arr_access + ");")
 149                     #else:
 150                     #    ret_conv = (ret_conv[0], ret_conv[1] + "\n" + ty_info.rust_obj.replace("LDK", "") + "_free(" + arr_name + "_var);")
 151
 152                 to_hu_conv = None
 153                 to_hu_conv_name = None
 154                 if subty.to_hu_conv is not None:
 155                     to_hu_conv = ty_info.java_hu_ty + " " + conv_name + "_arr = new " + ty_info.subty.java_hu_ty.split("<")[0] + "[" + arr_name + ".length];\n"
 156                     to_hu_conv = to_hu_conv + "for (int " + idxc + " = 0; " + idxc + " < " + arr_name + ".length; " + idxc + "++) {\n"
 157                     to_hu_conv = to_hu_conv + "\t" + subty.java_ty + " " + conv_name + " = " + arr_name + "[" + idxc + "];\n"
 158                     to_hu_conv = to_hu_conv + "\t" + subty.to_hu_conv.replace("\n", "\n\t") + "\n"
 159                     to_hu_conv = to_hu_conv + "\t" + conv_name + "_arr[" + idxc + "] = " + subty.to_hu_conv_name + ";\n}"
 160                     to_hu_conv_name = conv_name + "_arr"
 161                 from_hu_conv = None
 162                 if subty.from_hu_conv is not None:
 163                     if subty.java_ty == "long" and subty.java_hu_ty != "long":
 164                         from_hu_conv = ("Arrays.stream(" + arr_name + ").mapToLong(" + conv_name + " -> " + subty.from_hu_conv[0] + ").toArray()", "/* TODO 2 " + subty.java_hu_ty + "  */")
 165                     elif subty.java_ty == "long":
 166                         from_hu_conv = ("Arrays.stream(" + arr_name + ").map(" + conv_name + " -> " + subty.from_hu_conv[0] + ").toArray()", "/* TODO 2 " + subty.java_hu_ty + "  */")
 167                     else:
 168                         from_hu_conv = ("Arrays.stream(" + arr_name + ").map(" + conv_name + " -> " + subty.from_hu_conv[0] + ").toArray(" + ty_info.java_ty + "::new)", "/* TODO 2 " + subty.java_hu_ty + "  */")
 169
 170                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 171                     arg_conv = arg_conv, arg_conv_name = arg_conv_name, arg_conv_cleanup = arg_conv_cleanup,
 172                     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)
 173         elif ty_info.java_ty == "String":
 174             if ty_info.arr_access is None:
 175                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 176                     arg_conv = None, arg_conv_name = None, arg_conv_cleanup = None,
 177                     ret_conv = ("const char* " + ty_info.var_name + "_str = ",
 178                         ";\njstring " + ty_info.var_name + "_conv = " + self.consts.str_ref_to_c_call(ty_info.var_name + "_str", "strlen(" + ty_info.var_name + "_str)") + ";"),
 179                     ret_conv_name = ty_info.var_name + "_conv",
 180                     to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 181             else:
 182                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 183                     arg_conv = None, arg_conv_name = None, arg_conv_cleanup = None,
 184                     ret_conv = ("LDKStr " + ty_info.var_name + "_str = ",
 185                         ";\njstring " + ty_info.var_name + "_conv = " + self.consts.str_ref_to_c_call(ty_info.var_name + "_str." + ty_info.arr_access, ty_info.var_name + "_str." + ty_info.arr_len) + ";"),
 186                     ret_conv_name = ty_info.var_name + "_conv", to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 187         elif ty_info.var_name == "" and not print_void:
 188             # We don't have a parameter name, and want one, just call it arg
 189             if not ty_info.is_native_primitive:
 190                 assert(not is_free or ty_info.rust_obj not in self.opaque_structs)
 191                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 192                     arg_conv = ty_info.rust_obj + " arg_conv = *(" + ty_info.rust_obj + "*)arg;\nFREE((void*)arg);",
 193                     arg_conv_name = "arg_conv", arg_conv_cleanup = None,
 194                     ret_conv = None, ret_conv_name = None, to_hu_conv = "TODO 7", to_hu_conv_name = None, from_hu_conv = None)
 195             else:
 196                 assert(not is_free)
 197                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 198                     arg_conv = None, arg_conv_name = "arg", arg_conv_cleanup = None,
 199                     ret_conv = None, ret_conv_name = None, to_hu_conv = "TODO 8", to_hu_conv_name = None, from_hu_conv = None)
 200         elif ty_info.is_native_primitive:
 201             return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 202                 arg_conv = None, arg_conv_name = ty_info.var_name, arg_conv_cleanup = None,
 203                 ret_conv = None, ret_conv_name = None, to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 204         else:
 205             if ty_info.var_name == "":
 206                 ty_info.var_name = "ret"
 207
 208             if ty_info.rust_obj in self.opaque_structs:
 209                 from_hu_conv = (ty_info.var_name + " == null ? 0 : " + ty_info.var_name + ".ptr & ~1", "this.ptrs_to.add(" + ty_info.var_name + ")")
 210                 opaque_arg_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv;\n"
 211                 opaque_arg_conv = opaque_arg_conv + ty_info.var_name + "_conv.inner = (void*)(" + ty_info.var_name + " & (~1));\n"
 212                 if ty_info.is_ptr and holds_ref:
 213                     opaque_arg_conv = opaque_arg_conv + ty_info.var_name + "_conv.is_owned = false;"
 214                 else:
 215                     opaque_arg_conv = opaque_arg_conv + ty_info.var_name + "_conv.is_owned = (" + ty_info.var_name + " & 1) || (" + ty_info.var_name + " == 0);"
 216                 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:
 217                     if (ty_info.rust_obj.replace("LDK", "") + "_clone") in self.clone_fns:
 218                         # 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.
 219                         opaque_arg_conv = opaque_arg_conv + "\n" + ty_info.var_name + "_conv = " + ty_info.rust_obj.replace("LDK", "") + "_clone(&" + ty_info.var_name + "_conv);"
 220                     elif ty_info.passed_as_ptr:
 221                         opaque_arg_conv = opaque_arg_conv + "\n// Warning: we need a move here but no clone is available for " + ty_info.rust_obj
 222                         # TODO: Once we support features cloning (which just isn't in C yet), we can make this a compile error instead!
 223                         from_hu_conv = (from_hu_conv[0], from_hu_conv[1] + ";\n" +
 224                             "// Due to rust's strict-ownership memory model, in some cases we need to \"move\"\n" +
 225                             "// an object to pass exclusive ownership to the function being called.\n" +
 226                             "// In most cases, we avoid this being visible in GC'd languages by cloning the object\n" +
 227                             "// at the FFI layer, creating a new object which Rust can claim ownership of\n" +
 228                             "// However, in some cases (eg here), there is no way to clone an object, and thus\n" +
 229                             "// we actually have to pass full ownership to Rust.\n" +
 230                             "// Thus, after this call, " + ty_info.var_name + " is reset to null and is now a dummy object.\n" + ty_info.var_name + ".ptr = 0")
 231
 232                 opaque_ret_conv_suf = ";\n"
 233                 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
 234                     opaque_ret_conv_suf = opaque_ret_conv_suf + ty_info.var_name + "_var = " + ty_info.rust_obj.replace("LDK", "") + "_clone(" + ty_info.var_name + ");\n"
 235                 elif not holds_ref and ty_info.is_ptr:
 236                     opaque_ret_conv_suf = opaque_ret_conv_suf + "// Warning: we may need a move here but no clone is available for " + ty_info.rust_obj + "\n"
 237
 238                 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"
 239                 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"
 240                 if holds_ref:
 241                     opaque_ret_conv_suf = opaque_ret_conv_suf + "long " + ty_info.var_name + "_ref = (long)" + ty_info.var_name + "_var.inner & ~1;"
 242                 else:
 243                     opaque_ret_conv_suf = opaque_ret_conv_suf + "long " + ty_info.var_name + "_ref = (long)" + ty_info.var_name + "_var.inner;\n"
 244                     opaque_ret_conv_suf = opaque_ret_conv_suf + "if (" + ty_info.var_name + "_var.is_owned) {\n"
 245                     opaque_ret_conv_suf = opaque_ret_conv_suf + "\t" + ty_info.var_name + "_ref |= 1;\n"
 246                     opaque_ret_conv_suf = opaque_ret_conv_suf + "}"
 247
 248                 if ty_info.is_ptr:
 249                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 250                         arg_conv = opaque_arg_conv, arg_conv_name = "&" + ty_info.var_name + "_conv", arg_conv_cleanup = None,
 251                         ret_conv = (ty_info.rust_obj + " " + ty_info.var_name + "_var = *", opaque_ret_conv_suf),
 252                         ret_conv_name = ty_info.var_name + "_ref",
 253                         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),
 254                         to_hu_conv_name = ty_info.var_name + "_hu_conv",
 255                         from_hu_conv = from_hu_conv)
 256                 else:
 257                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 258                         arg_conv = opaque_arg_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 259                         ret_conv = (ty_info.rust_obj + " " + ty_info.var_name + "_var = ", opaque_ret_conv_suf),
 260                         ret_conv_name = ty_info.var_name + "_ref",
 261                         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) + "\n" + ty_info.var_name + "_hu_conv.ptrs_to.add(this);",
 262                         to_hu_conv_name = ty_info.var_name + "_hu_conv",
 263                         from_hu_conv = from_hu_conv)
 264
 265             if not ty_info.is_ptr:
 266                 if ty_info.rust_obj in self.unitary_enums:
 267                     (ret_pfx, ret_sfx) = self.consts.c_unitary_enum_to_native_call(ty_info)
 268                     (arg_pfx, arg_sfx) = self.consts.native_unitary_enum_to_c_call(ty_info)
 269                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 270                         arg_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv = " + arg_pfx + ty_info.var_name + arg_sfx + ";",
 271                         arg_conv_name = ty_info.var_name + "_conv",
 272                         arg_conv_cleanup = None,
 273                         ret_conv = (ty_info.c_ty + " " + ty_info.var_name + "_conv = " + ret_pfx, ret_sfx + ";"),
 274                         ret_conv_name = ty_info.var_name + "_conv", to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 275                 base_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv = *(" + ty_info.rust_obj + "*)(((uint64_t)" + ty_info.var_name + ") & ~1);"
 276                 if ty_info.rust_obj in self.trait_structs:
 277                     ret_conv = (ty_info.rust_obj + "* ret = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n*ret = ", ";")
 278                     if holds_ref:
 279                         if (ty_info.rust_obj.replace("LDK", "") + "_clone") in self.clone_fns:
 280                             ret_conv = (ret_conv[0] + ty_info.rust_obj.replace("LDK", "") + "_clone(&", ");")
 281                         else:
 282                             ret_conv = (ret_conv[0], "; // Warning: We likely need to clone here, but no clone is available for " + ty_info.rust_obj)
 283                     if not is_free:
 284                         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
 285                         if needs_full_clone and (ty_info.rust_obj.replace("LDK", "") + "_clone") in self.clone_fns:
 286                             base_conv = base_conv + "\n" + ty_info.var_name + "_conv = " + ty_info.rust_obj.replace("LDK", "") + "_clone(" + ty_info.var_name + ");"
 287                         else:
 288                             base_conv = base_conv + self.consts.trait_struct_inc_refcnt(ty_info)
 289                             if needs_full_clone:
 290                                 base_conv = base_conv + "// Warning: we may need a move here but no clone is available for " + ty_info.rust_obj + "\n"
 291                     else:
 292                         base_conv = base_conv + "\n" + "FREE((void*)" + ty_info.var_name + ");"
 293                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 294                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 295                         ret_conv = ret_conv, ret_conv_name = "(long)ret",
 296                         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);",
 297                         to_hu_conv_name = "ret_hu_conv",
 298                         from_hu_conv = (ty_info.var_name + " == null ? 0 : " + ty_info.var_name + ".ptr", "this.ptrs_to.add(" + ty_info.var_name + ")"))
 299                 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
 300                 if needs_full_clone:
 301                     if not ty_info.var_name.startswith("ret") or "res" in ty_info.var_name: # XXX: This is a stupid hack
 302                         needs_full_clone = False
 303                     if needs_full_clone and (ty_info.rust_obj.replace("LDK", "") + "_clone") in self.clone_fns:
 304                         base_conv = base_conv + "\n" + ty_info.var_name + "_conv = " + ty_info.rust_obj.replace("LDK", "") + "_clone((" + ty_info.rust_obj + "*)" + ty_info.var_name + ");"
 305                     elif needs_full_clone:
 306                         base_conv = base_conv + "\n// Warning: we may need a move here but no clone is available for " + ty_info.rust_obj
 307                 if not needs_full_clone and ty_info.rust_obj != "LDKu8slice":
 308                     # Don't bother free'ing slices passed in - Rust doesn't auto-free the
 309                     # underlying unlike Vecs, and it gives Java more freedom.
 310                     base_conv = base_conv + "\nFREE((void*)" + ty_info.var_name + ");"
 311                 if ty_info.rust_obj in self.complex_enums:
 312                     ret_conv = ("long " + ty_info.var_name + "_ref = ((long)&", ") | 1;")
 313                     if not holds_ref:
 314                         ret_conv = (ty_info.rust_obj + " *" + ty_info.var_name + "_copy = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n", "")
 315                         if ty_info.requires_clone == True: # Set in object array mapping
 316                             if (ty_info.rust_obj.replace("LDK", "") + "_clone") in self.clone_fns:
 317                                 ret_conv = (ret_conv[0] + "*" + ty_info.var_name + "_copy = " + ty_info.rust_obj.replace("LDK", "") + "_clone(&", ");\n")
 318                             else:
 319                                 ret_conv = (ret_conv[0] + "*" + ty_info.var_name + "_copy = ", "; // Warning: We likely need to clone here, but no clone is available for " + ty_inf.rust_obj + "\n")
 320                         else:
 321                             ret_conv = (ret_conv[0] + "*" + ty_info.var_name + "_copy = ", ";\n")
 322                         ret_conv = (ret_conv[0], ret_conv[1] + "long " + ty_info.var_name + "_ref = (long)" + ty_info.var_name + "_copy;")
 323                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 324                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 325                         ret_conv = ret_conv, ret_conv_name = ty_info.var_name + "_ref",
 326                         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);",
 327                         to_hu_conv_name = ty_info.var_name + "_hu_conv", from_hu_conv = (ty_info.var_name + ".ptr", ""))
 328                 if ty_info.rust_obj in self.result_types:
 329                     if holds_ref:
 330                         # If we're trying to return a ref, we have to clone.
 331                         # We just blindly assume its implemented and let the compiler fail if its not.
 332                         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 = ", ";")
 333                         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);")
 334                     else:
 335                         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 = ", ";")
 336                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 337                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 338                         ret_conv = ret_conv, ret_conv_name = "(long)" + ty_info.var_name + "_conv",
 339                         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 + ");",
 340                         to_hu_conv_name = ty_info.var_name + "_hu_conv", from_hu_conv = (ty_info.var_name + " != null ? " + ty_info.var_name + ".ptr : 0", ""))
 341                 if ty_info.rust_obj in self.tuple_types:
 342                     from_hu_conv_sfx = ""
 343                     from_hu_conv = "bindings." + self.tuple_types[ty_info.rust_obj][1].replace("LDK", "") + "_new("
 344                     to_hu_conv_pfx = ""
 345                     to_hu_conv_sfx = ty_info.java_hu_ty + " " + ty_info.var_name + "_conv = new " + ty_info.java_hu_ty + "("
 346                     to_hu_conv_refs = ""
 347                     for idx, conv in enumerate(self.tuple_types[ty_info.rust_obj][0]):
 348                         if idx != 0:
 349                             to_hu_conv_sfx = to_hu_conv_sfx + ", "
 350                             from_hu_conv = from_hu_conv + ", "
 351                         conv.var_name = ty_info.var_name + "_" + chr(idx + ord("a"))
 352                         conv_map = self.map_type_with_info(conv, False, None, is_free, holds_ref)
 353                         to_hu_conv_pfx = to_hu_conv_pfx + conv.java_ty + " " + ty_info.var_name + "_" + chr(idx + ord("a")) + " = "
 354                         if not conv.is_native_primitive and (conv_map.rust_obj.replace("LDK", "") + "_clone") in self.clone_fns and conv_map.rust_obj == "LDKTxOut":
 355                             to_hu_conv_pfx = to_hu_conv_pfx + "bindings." + conv_map.rust_obj.replace("LDK", "") + "_clone("
 356                         to_hu_conv_pfx = to_hu_conv_pfx + "bindings." + self.tuple_types[ty_info.rust_obj][1] + "_get_" + chr(idx + ord("a")) + "(" + ty_info.var_name + ")"
 357                         if not conv.is_native_primitive and (conv_map.rust_obj.replace("LDK", "") + "_clone") in self.clone_fns and conv_map.rust_obj == "LDKTxOut": # XXX
 358                             to_hu_conv_pfx = to_hu_conv_pfx + ")"
 359                         to_hu_conv_pfx = to_hu_conv_pfx + ";\n"
 360                         if conv_map.to_hu_conv is not None:
 361                             to_hu_conv_pfx = to_hu_conv_pfx + conv_map.to_hu_conv + ";\n"
 362                             to_hu_conv_sfx = to_hu_conv_sfx + conv_map.to_hu_conv_name
 363                             if to_hu_conv_refs is not None:
 364                                 if conv_map.c_ty.endswith("Array"):
 365                                     to_hu_conv_refs = None
 366                                 else:
 367                                     to_hu_conv_refs = to_hu_conv_refs + "\n" + conv_map.to_hu_conv_name + ".ptrs_to.add(" + ty_info.var_name + "_conv);"
 368                         else:
 369                             to_hu_conv_sfx = to_hu_conv_sfx + ty_info.var_name + "_" + chr(idx + ord("a"))
 370                         if conv_map.from_hu_conv is not None:
 371                             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")))
 372                             if conv_map.from_hu_conv[1] != "":
 373                                 from_hu_conv_sfx = from_hu_conv_sfx + conv_map.from_hu_conv[1].replace(conv.var_name, ty_info.var_name + "." + chr(idx + ord("a")))
 374                         else:
 375                             from_hu_conv = from_hu_conv + ty_info.var_name + "." + chr(idx + ord("a"))
 376
 377                     if to_hu_conv_refs is None:
 378                         to_hu_conv = to_hu_conv_pfx + to_hu_conv_sfx + ");\n// Warning: We may not free the C tuple object!"
 379                     else:
 380                         to_hu_conv = to_hu_conv_pfx + to_hu_conv_sfx + ", () -> {\n"
 381                         to_hu_conv = to_hu_conv + "\tbindings." + ty_info.rust_obj.replace("LDK", "") + "_free(" + ty_info.var_name + ");\n"
 382                         to_hu_conv = to_hu_conv + "});" + to_hu_conv_refs
 383                     if not ty_info.is_ptr and not holds_ref:
 384                         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 = ", ";")
 385                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 386                             arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 387                             ret_conv = ret_conv,
 388                             ret_conv_name = "(long)" + ty_info.var_name + "_ref",
 389                             to_hu_conv = to_hu_conv, to_hu_conv_name = ty_info.var_name + "_conv", from_hu_conv = (from_hu_conv + ")", from_hu_conv_sfx))
 390                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 391                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 392                         ret_conv = ("long " + ty_info.var_name + "_ref = (long)(&", ") | 1;"), ret_conv_name = ty_info.var_name + "_ref",
 393                         to_hu_conv = to_hu_conv, to_hu_conv_name = ty_info.var_name + "_conv", from_hu_conv = (from_hu_conv + ")", from_hu_conv_sfx))
 394
 395                 # The manually-defined types - TxOut and Transaction
 396                 assert ty_info.rust_obj == "LDKTxOut"
 397                 if not ty_info.is_ptr and not holds_ref:
 398                     ret_conv = ("LDKTxOut* " + ty_info.var_name + "_ref = MALLOC(sizeof(LDKTxOut), \"LDKTxOut\");\n*" + ty_info.var_name + "_ref = ", ";")
 399                 else:
 400                     ret_conv = ("long " + ty_info.var_name + "_ref = ((long)&", ") | 1;")
 401                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 402                     arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 403                     ret_conv = ret_conv, ret_conv_name = "(long)" + ty_info.var_name + "_ref",
 404                     to_hu_conv = ty_info.java_hu_ty + " " + ty_info.var_name + "_conv = new " +ty_info.java_hu_ty + "(null, " + ty_info.var_name + ");",
 405                     to_hu_conv_name = ty_info.var_name + "_conv", from_hu_conv = (ty_info.var_name + ".ptr", ""))
 406             elif ty_info.is_ptr:
 407                 assert(not is_free)
 408                 if ty_info.rust_obj in self.complex_enums:
 409                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 410                         arg_conv = ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)" + ty_info.var_name + ";",
 411                         arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 412                         ret_conv = ("long ret_" + ty_info.var_name + " = (long)", ";"), ret_conv_name = "ret_" + ty_info.var_name,
 413                         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 + ");",
 414                         to_hu_conv_name = ty_info.var_name + "_hu_conv",
 415                         from_hu_conv = (ty_info.var_name + " == null ? 0 : " + ty_info.var_name + ".ptr & ~1", "this.ptrs_to.add(" + ty_info.var_name + ")"))
 416                 elif ty_info.rust_obj in self.trait_structs:
 417                     if ty_info.rust_obj.replace("LDK", "") + "_clone" in self.clone_fns:
 418                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 419                             arg_conv = ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)" + ty_info.var_name + ";",
 420                             arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 421                             ret_conv = (ty_info.rust_obj + " *" + ty_info.var_name + "_clone = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n" +
 422                                 "*" + ty_info.var_name + "_clone = " + ty_info.rust_obj.replace("LDK", "") + "_clone(", ");"),
 423                             ret_conv_name = "(long)" + ty_info.var_name + "_clone",
 424                             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);",
 425                             to_hu_conv_name = "ret_hu_conv",
 426                             from_hu_conv = (ty_info.var_name + " == null ? 0 : " + ty_info.var_name + ".ptr", "this.ptrs_to.add(" + ty_info.var_name + ")"))
 427                     else:
 428                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 429                             arg_conv = ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)" + ty_info.var_name + ";",
 430                             arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 431                             ret_conv = ("long ret_" + ty_info.var_name + " = (long)", ";"), ret_conv_name = "ret_" + ty_info.var_name,
 432                             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);",
 433                             to_hu_conv_name = "ret_hu_conv",
 434                             from_hu_conv = (ty_info.var_name + " == null ? 0 : " + ty_info.var_name + ".ptr", "this.ptrs_to.add(" + ty_info.var_name + ")"))
 435                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 436                     arg_conv = ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)(" + ty_info.var_name + " & ~1);",
 437                     arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 438                     ret_conv = ("long ret_" + ty_info.var_name + " = (long)", ";"), ret_conv_name = "ret_" + ty_info.var_name,
 439                     to_hu_conv = "TODO 3", to_hu_conv_name = None, from_hu_conv = None) # its a pointer, no conv needed
 440             assert False # We should have handled every case by now.