_ 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, c_array_class_caches, 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.c_array_class_caches = c_array_class_caches
  10         self.opaque_structs = opaque_structs
  11         self.clone_fns = clone_fns
  12         self.unitary_enums = unitary_enums
  13         self.trait_structs = trait_structs
  14         self.complex_enums = complex_enums
  15         self.result_types = result_types
  16         self.tuple_types = tuple_types
  17
  18     def map_type(self, fn_arg, print_void, ret_arr_len, is_free, holds_ref):
  19         ty_info = self.java_c_types(fn_arg, ret_arr_len)
  20         return self.map_type_with_info(ty_info, print_void, ret_arr_len, is_free, holds_ref)
  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                 elif not ty_info.java_ty[:len(ty_info.java_ty) - 2].endswith("[]"):
 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                     ret_conv = (ret_conv[0], ret_conv[1] + subty.c_ty + " *" + arr_name + "_arr_ptr = " + self.consts.get_native_arr_ptr_call[0] + arr_name + "_arr" + self.consts.get_native_arr_ptr_call[1] + ";\n")
 125                     ret_conv = (ret_conv[0], ret_conv[1] + "for (size_t " + idxc + " = 0; " + idxc + " < " + arr_name + "_var." + arr_len + "; " + idxc + "++) {\n")
 126                     ret_conv = (ret_conv[0], ret_conv[1] + "\t" + subty.ret_conv[0].replace("\n", "\n\t"))
 127                     ret_conv = (ret_conv[0], ret_conv[1] + arr_name + "_var." + ty_info.arr_access + "[" + idxc + "]" + subty.ret_conv[1].replace("\n", "\n\t"))
 128                     ret_conv = (ret_conv[0], ret_conv[1] + "\n\t" + arr_name + "_arr_ptr[" + idxc + "] = " + subty.ret_conv_name + ";\n}")
 129                     cleanup = self.consts.release_native_arr_ptr_call(arr_name + "_arr", arr_name + "_arr_ptr")
 130                     if cleanup is not None:
 131                         ret_conv = (ret_conv[0], ret_conv[1] + "\n" + cleanup + ";")
 132                 else:
 133                     assert ty_info.java_fn_ty_arg.startswith("[")
 134                     clz_var = ty_info.java_fn_ty_arg[1:].replace("[", "arr_of_")
 135                     self.c_array_class_caches.add(clz_var)
 136                     ret_conv = (ret_conv[0], ";\n" + ty_info.c_ty + " " + arr_name + "_arr = (*env)->NewObjectArray(env, " + arr_name + "_var." + arr_len + ", " + clz_var + "_clz, NULL);\n")
 137                     ret_conv = (ret_conv[0], ret_conv[1] + "for (size_t " + idxc + " = 0; " + idxc + " < " + arr_name + "_var." + arr_len + "; " + idxc + "++) {\n")
 138                     ret_conv = (ret_conv[0], ret_conv[1] + "\t" + subty.ret_conv[0].replace("\n", "\n\t"))
 139                     ret_conv = (ret_conv[0], ret_conv[1] + arr_name + "_var." + ty_info.arr_access + "[" + idxc + "]" + subty.ret_conv[1].replace("\n", "\n\t"))
 140                     ret_conv = (ret_conv[0], ret_conv[1] + "\n\t(*env)->SetObjectArrayElement(env, " + arr_name + "_arr, " + idxc + ", " + subty.ret_conv_name + ");\n")
 141                     ret_conv = (ret_conv[0], ret_conv[1] + "}")
 142                 if not holds_ref:
 143                     # XXX: The commented if's are a bit smarter freeing, but we need to be a nudge smarter still
 144                     # Note that we don't drop the full vec here - we're passing ownership to java (or have cloned) or free'd by now!
 145                     ret_conv = (ret_conv[0], ret_conv[1] + "\nFREE(" + arr_name + "_var." + ty_info.arr_access + ");")
 146                     #if subty.rust_obj is not None and subty.rust_obj in self.opaque_structs:
 147                     #    ret_conv = (ret_conv[0], ret_conv[1] + "\nFREE(" + arr_name + "_var." + ty_info.arr_access + ");")
 148                     #else:
 149                     #    ret_conv = (ret_conv[0], ret_conv[1] + "\n" + ty_info.rust_obj.replace("LDK", "") + "_free(" + arr_name + "_var);")
 150
 151                 to_hu_conv = None
 152                 to_hu_conv_name = None
 153                 if subty.to_hu_conv is not None:
 154                     to_hu_conv = ty_info.java_hu_ty + " " + conv_name + "_arr = new " + ty_info.subty.java_hu_ty.split("<")[0] + "[" + arr_name + ".length];\n"
 155                     to_hu_conv = to_hu_conv + "for (int " + idxc + " = 0; " + idxc + " < " + arr_name + ".length; " + idxc + "++) {\n"
 156                     to_hu_conv = to_hu_conv + "\t" + subty.java_ty + " " + conv_name + " = " + arr_name + "[" + idxc + "];\n"
 157                     to_hu_conv = to_hu_conv + "\t" + subty.to_hu_conv.replace("\n", "\n\t") + "\n"
 158                     to_hu_conv = to_hu_conv + "\t" + conv_name + "_arr[" + idxc + "] = " + subty.to_hu_conv_name + ";\n}"
 159                     to_hu_conv_name = conv_name + "_arr"
 160                 from_hu_conv = None
 161                 if subty.from_hu_conv is not None:
 162                     if subty.java_ty == "long" and subty.java_hu_ty != "long":
 163                         from_hu_conv = ("Arrays.stream(" + arr_name + ").mapToLong(" + conv_name + " -> " + subty.from_hu_conv[0] + ").toArray()", "/* TODO 2 " + subty.java_hu_ty + "  */")
 164                     elif subty.java_ty == "long":
 165                         from_hu_conv = ("Arrays.stream(" + arr_name + ").map(" + conv_name + " -> " + subty.from_hu_conv[0] + ").toArray()", "/* TODO 2 " + subty.java_hu_ty + "  */")
 166                     else:
 167                         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 + "  */")
 168
 169                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 170                     arg_conv = arg_conv, arg_conv_name = arg_conv_name, arg_conv_cleanup = arg_conv_cleanup,
 171                     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)
 172         elif ty_info.java_ty == "String":
 173             if ty_info.arr_access is None:
 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 = ("jstring " + ty_info.var_name + "_conv = (*env)->NewStringUTF(env, ", ");"), ret_conv_name = ty_info.var_name + "_conv",
 177                     to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 178             else:
 179                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 180                     arg_conv = None, arg_conv_name = None, arg_conv_cleanup = None,
 181                     ret_conv = ("LDKStr " + ty_info.var_name + "_str = ",
 182                         ";\nchar* " + ty_info.var_name + "_buf = MALLOC(" + ty_info.var_name + "_str." + ty_info.arr_len + " + 1, \"str conv buf\");\n" +
 183                         "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" +
 184                         ty_info.var_name + "_buf[" + ty_info.var_name + "_str." + ty_info.arr_len + "] = 0;\n" +
 185                         "jstring " + ty_info.var_name + "_conv = (*env)->NewStringUTF(env, " + ty_info.var_name + "_str." + ty_info.arr_access + ");\n" +
 186                         "FREE(" + ty_info.var_name + "_buf);"),
 187                     ret_conv_name = ty_info.var_name + "_conv", to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 188         elif ty_info.var_name == "" and not print_void:
 189             # We don't have a parameter name, and want one, just call it arg
 190             if ty_info.rust_obj is not None:
 191                 assert(not is_free or ty_info.rust_obj not in self.opaque_structs)
 192                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 193                     arg_conv = ty_info.rust_obj + " arg_conv = *(" + ty_info.rust_obj + "*)arg;\nFREE((void*)arg);",
 194                     arg_conv_name = "arg_conv", arg_conv_cleanup = None,
 195                     ret_conv = None, ret_conv_name = None, to_hu_conv = "TODO 7", to_hu_conv_name = None, from_hu_conv = None)
 196             else:
 197                 assert(not is_free)
 198                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 199                     arg_conv = None, arg_conv_name = "arg", arg_conv_cleanup = None,
 200                     ret_conv = None, ret_conv_name = None, to_hu_conv = "TODO 8", to_hu_conv_name = None, from_hu_conv = None)
 201         elif ty_info.rust_obj is None:
 202             return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 203                 arg_conv = None, arg_conv_name = ty_info.var_name, arg_conv_cleanup = None,
 204                 ret_conv = None, ret_conv_name = None, to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 205         else:
 206             if ty_info.var_name == "":
 207                 ty_info.var_name = "ret"
 208
 209             if ty_info.rust_obj in self.opaque_structs:
 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 + "\nif (" + ty_info.var_name + "_conv.inner != NULL)\n"
 220                         opaque_arg_conv = opaque_arg_conv + "\t" + ty_info.var_name + "_conv = " + ty_info.rust_obj.replace("LDK", "") + "_clone(&" + ty_info.var_name + "_conv);"
 221                     elif ty_info.passed_as_ptr:
 222                         opaque_arg_conv = opaque_arg_conv + "\n// Warning: we may need a move here but can't clone!"
 223
 224                 opaque_ret_conv_suf = ";\n"
 225                 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
 226                     opaque_ret_conv_suf = opaque_ret_conv_suf + "if (" + ty_info.var_name + "->inner != NULL)\n"
 227                     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"
 228                 elif not holds_ref and ty_info.is_ptr:
 229                     opaque_ret_conv_suf = opaque_ret_conv_suf + "// Warning: we may need a move here but can't clone!\n"
 230
 231                 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"
 232                 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"
 233                 if holds_ref:
 234                     opaque_ret_conv_suf = opaque_ret_conv_suf + "long " + ty_info.var_name + "_ref = (long)" + ty_info.var_name + "_var.inner & ~1;"
 235                 else:
 236                     opaque_ret_conv_suf = opaque_ret_conv_suf + "long " + ty_info.var_name + "_ref = (long)" + ty_info.var_name + "_var.inner;\n"
 237                     opaque_ret_conv_suf = opaque_ret_conv_suf + "if (" + ty_info.var_name + "_var.is_owned) {\n"
 238                     opaque_ret_conv_suf = opaque_ret_conv_suf + "\t" + ty_info.var_name + "_ref |= 1;\n"
 239                     opaque_ret_conv_suf = opaque_ret_conv_suf + "}"
 240
 241                 if ty_info.is_ptr:
 242                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 243                         arg_conv = opaque_arg_conv, arg_conv_name = "&" + ty_info.var_name + "_conv", arg_conv_cleanup = None,
 244                         ret_conv = (ty_info.rust_obj + " " + ty_info.var_name + "_var = *", opaque_ret_conv_suf),
 245                         ret_conv_name = ty_info.var_name + "_ref",
 246                         # to_hu_conv = ty_info.java_hu_ty + " " + ty_info.var_name + "_hu_conv = new " + ty_info.java_hu_ty + "(null, " + ty_info.var_name + ");",
 247                         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),
 248                         to_hu_conv_name = ty_info.var_name + "_hu_conv",
 249                         from_hu_conv = (ty_info.var_name + " == null ? 0 : " + ty_info.var_name + ".ptr & ~1", "this.ptrs_to.add(" + ty_info.var_name + ")"))
 250                 else:
 251                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 252                         arg_conv = opaque_arg_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 253                         ret_conv = (ty_info.rust_obj + " " + ty_info.var_name + "_var = ", opaque_ret_conv_suf),
 254                         ret_conv_name = ty_info.var_name + "_ref",
 255                         # to_hu_conv = ty_info.java_hu_ty + " " + ty_info.var_name + "_hu_conv = new " + ty_info.java_hu_ty + "(null, " + ty_info.var_name + ");",
 256                         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),
 257                         to_hu_conv_name = ty_info.var_name + "_hu_conv",
 258                         from_hu_conv = (ty_info.var_name + " == null ? 0 : " + ty_info.var_name + ".ptr & ~1", "this.ptrs_to.add(" + ty_info.var_name + ")"))
 259
 260             if not ty_info.is_ptr:
 261                 if ty_info.rust_obj in self.unitary_enums:
 262                     (ret_pfx, ret_sfx) = self.consts.c_unitary_enum_to_native_call(ty_info)
 263                     (arg_pfx, arg_sfx) = self.consts.native_unitary_enum_to_c_call(ty_info)
 264                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 265                         arg_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv = " + arg_pfx + ty_info.var_name + arg_sfx + ";",
 266                         arg_conv_name = ty_info.var_name + "_conv",
 267                         arg_conv_cleanup = None,
 268                         ret_conv = (ty_info.c_ty + " " + ty_info.var_name + "_conv = " + ret_pfx, ret_sfx + ";"),
 269                         ret_conv_name = ty_info.var_name + "_conv", to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 270                 base_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv = *(" + ty_info.rust_obj + "*)" + ty_info.var_name + ";"
 271                 if ty_info.rust_obj in self.trait_structs:
 272                     if not is_free:
 273                         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
 274                         if needs_full_clone and (ty_info.rust_obj.replace("LDK", "") + "_clone") in self.clone_fns:
 275                             base_conv = base_conv + "\n" + ty_info.var_name + "_conv = " + ty_info.rust_obj.replace("LDK", "") + "_clone(" + ty_info.var_name + ");"
 276                         else:
 277                             base_conv = base_conv + "\nif (" + ty_info.var_name + "_conv.free == " + ty_info.rust_obj + "_JCalls_free) {\n"
 278                             base_conv = base_conv + "\t// If this_arg is a JCalls struct, then we need to increment the refcnt in it.\n"
 279                             base_conv = base_conv + "\t" + ty_info.rust_obj + "_JCalls_clone(" + ty_info.var_name + "_conv.this_arg);\n}"
 280                             if needs_full_clone:
 281                                 base_conv = base_conv + "// Warning: we may need a move here but can't do a full clone!\n"
 282
 283                     else:
 284                         base_conv = base_conv + "\n" + "FREE((void*)" + ty_info.var_name + ");"
 285                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 286                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 287                         ret_conv = (ty_info.rust_obj + "* ret = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n*ret = ", ";"),
 288                         ret_conv_name = "(long)ret",
 289                         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);",
 290                         to_hu_conv_name = "ret_hu_conv",
 291                         from_hu_conv = (ty_info.var_name + " == null ? 0 : " + ty_info.var_name + ".ptr", "this.ptrs_to.add(" + ty_info.var_name + ")"))
 292                 if ty_info.rust_obj != "LDKu8slice":
 293                     # Don't bother free'ing slices passed in - Rust doesn't auto-free the
 294                     # underlying unlike Vecs, and it gives Java more freedom.
 295                     base_conv = base_conv + "\nFREE((void*)" + ty_info.var_name + ");";
 296                 if ty_info.rust_obj in self.complex_enums:
 297                     ret_conv = ("long " + ty_info.var_name + "_ref = (long)&", ";")
 298                     if not holds_ref:
 299                         ret_conv = (ty_info.rust_obj + " *" + ty_info.var_name + "_copy = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n", "")
 300                         if ty_info.requires_clone == True: # Set in object array mapping
 301                             if (ty_info.rust_obj.replace("LDK", "") + "_clone") in self.clone_fns:
 302                                 ret_conv = (ret_conv[0] + "*" + ty_info.var_name + "_copy = " + ty_info.rust_obj.replace("LDK", "") + "_clone(&", ");\n")
 303                             else:
 304                                 ret_conv = (ret_conv[0] + "*" + ty_info.var_name + "_copy = ", "; // XXX: We likely need to clone here, but no _clone fn is available!\n")
 305                         else:
 306                             ret_conv = (ret_conv[0] + "*" + ty_info.var_name + "_copy = ", ";\n")
 307                         ret_conv = (ret_conv[0], ret_conv[1] + "long " + ty_info.var_name + "_ref = (long)" + ty_info.var_name + "_copy;")
 308                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 309                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 310                         ret_conv = ret_conv, ret_conv_name = ty_info.var_name + "_ref",
 311                         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);",
 312                         to_hu_conv_name = ty_info.var_name + "_hu_conv", from_hu_conv = (ty_info.var_name + ".ptr", ""))
 313                 if ty_info.rust_obj in self.result_types:
 314                     if holds_ref:
 315                         # If we're trying to return a ref, we have to clone.
 316                         # We just blindly assume its implemented and let the compiler fail if its not.
 317                         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 = ", ";")
 318                         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);")
 319                     else:
 320                         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 = ", ";")
 321                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 322                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 323                         ret_conv = ret_conv, ret_conv_name = "(long)" + ty_info.var_name + "_conv",
 324                         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 + ");",
 325                         to_hu_conv_name = ty_info.var_name + "_hu_conv", from_hu_conv = (ty_info.var_name + " != null ? " + ty_info.var_name + ".ptr : 0", ""))
 326                 if ty_info.rust_obj in self.tuple_types:
 327                     from_hu_conv = "bindings." + self.tuple_types[ty_info.rust_obj][1].replace("LDK", "") + "_new("
 328                     to_hu_conv_pfx = ""
 329                     to_hu_conv_sfx = ty_info.java_hu_ty + " " + ty_info.var_name + "_conv = new " + ty_info.java_hu_ty + "("
 330                     clone_ret_str = ""
 331                     for idx, conv in enumerate(self.tuple_types[ty_info.rust_obj][0]):
 332                         if idx != 0:
 333                             to_hu_conv_sfx = to_hu_conv_sfx + ", "
 334                             from_hu_conv = from_hu_conv + ", "
 335                         conv.var_name = ty_info.var_name + "_" + chr(idx + ord("a"))
 336                         conv_map = self.map_type_with_info(conv, False, None, is_free, holds_ref)
 337                         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"
 338                         if conv_map.to_hu_conv is not None:
 339                             to_hu_conv_pfx = to_hu_conv_pfx + conv_map.to_hu_conv + ";\n"
 340                             to_hu_conv_sfx = to_hu_conv_sfx + conv_map.to_hu_conv_name
 341                         else:
 342                             to_hu_conv_sfx = to_hu_conv_sfx + ty_info.var_name + "_" + chr(idx + ord("a"))
 343                         if conv_map.from_hu_conv is not None:
 344                             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")))
 345                             if conv_map.from_hu_conv[1] != "":
 346                                 from_hu_conv = from_hu_conv + "/*XXX: " + conv_map.from_hu_conv[1] + "*/"
 347                         else:
 348                             from_hu_conv = from_hu_conv + ty_info.var_name + "." + chr(idx + ord("a"))
 349
 350                         if conv.is_native_primitive:
 351                             pass
 352                         elif (conv_map.rust_obj.replace("LDK", "") + "_clone") in self.clone_fns:
 353                             accessor = ty_info.var_name + "_ref->" + chr(idx + ord("a"))
 354                             clone_ret_str = clone_ret_str + "\n" + accessor + " = " + conv_map.rust_obj.replace("LDK", "") + "_clone(&" + accessor + ");"
 355                         else:
 356                             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
 357                     if not ty_info.is_ptr and not holds_ref:
 358                         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 = ", ";")
 359                         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:
 360                             ret_conv = (ret_conv[0], ret_conv[1] + clone_ret_str)
 361                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 362                             arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 363                             ret_conv = ret_conv,
 364                             ret_conv_name = "(long)" + ty_info.var_name + "_ref",
 365                             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 + ")", ""))
 366                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 367                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 368                         ret_conv = ("long " + ty_info.var_name + "_ref = (long)&", ";"), ret_conv_name = ty_info.var_name + "_ref",
 369                         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 + ")", ""))
 370
 371                 # The manually-defined types - TxOut and Transaction
 372                 assert ty_info.rust_obj == "LDKTxOut"
 373                 if not ty_info.is_ptr and not holds_ref:
 374                     ret_conv = ("LDKTxOut* " + ty_info.var_name + "_ref = MALLOC(sizeof(LDKTxOut), \"LDKTxOut\");\n*" + ty_info.var_name + "_ref = ", ";")
 375                 else:
 376                     ret_conv = ("long " + ty_info.var_name + "_ref = (long)&", ";")
 377                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 378                     arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 379                     ret_conv = ret_conv, ret_conv_name = "(long)" + ty_info.var_name + "_ref",
 380                     to_hu_conv = ty_info.java_hu_ty + " " + ty_info.var_name + "_conv = new " +ty_info.java_hu_ty + "(null, " + ty_info.var_name + ");",
 381                     to_hu_conv_name = ty_info.var_name + "_conv", from_hu_conv = (ty_info.var_name + ".ptr", ""))
 382             elif ty_info.is_ptr:
 383                 assert(not is_free)
 384                 if ty_info.rust_obj in self.complex_enums:
 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 = ("long ret_" + ty_info.var_name + " = (long)", ";"), ret_conv_name = "ret_" + ty_info.var_name,
 389                         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 + ");",
 390                         to_hu_conv_name = ty_info.var_name + "_hu_conv",
 391                         from_hu_conv = (ty_info.var_name + " == null ? 0 : " + ty_info.var_name + ".ptr & ~1", "this.ptrs_to.add(" + ty_info.var_name + ")"))
 392                 elif ty_info.rust_obj in self.trait_structs:
 393                     if ty_info.rust_obj.replace("LDK", "") + "_clone" in self.clone_fns:
 394                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 395                             arg_conv = ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)" + ty_info.var_name + ";",
 396                             arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 397                             ret_conv = (ty_info.rust_obj + " *" + ty_info.var_name + "_clone = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n" +
 398                                 "*" + ty_info.var_name + "_clone = " + ty_info.rust_obj.replace("LDK", "") + "_clone(", ");"),
 399                             ret_conv_name = "(long)" + ty_info.var_name + "_clone",
 400                             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);",
 401                             to_hu_conv_name = "ret_hu_conv",
 402                             from_hu_conv = (ty_info.var_name + " == null ? 0 : " + ty_info.var_name + ".ptr", "this.ptrs_to.add(" + ty_info.var_name + ")"))
 403                     else:
 404                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 405                             arg_conv = ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)" + ty_info.var_name + ";",
 406                             arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 407                             ret_conv = ("long ret_" + ty_info.var_name + " = (long)", ";"), ret_conv_name = "ret_" + ty_info.var_name,
 408                             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);",
 409                             to_hu_conv_name = "ret_hu_conv",
 410                             from_hu_conv = (ty_info.var_name + " == null ? 0 : " + ty_info.var_name + ".ptr", "this.ptrs_to.add(" + ty_info.var_name + ")"))
 411                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 412                     arg_conv = ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)" + ty_info.var_name + ";",
 413                     arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 414                     ret_conv = ("long ret_" + ty_info.var_name + " = (long)", ";"), ret_conv_name = "ret_" + ty_info.var_name,
 415                     to_hu_conv = "TODO 3", to_hu_conv_name = None, from_hu_conv = None) # its a pointer, no conv needed
 416             assert False # We should have handled every case by now.