Add support for U128, passed as [u8; 16] but with human wrappers
[ldk-java] / genbindings.py
index b8e58bc5b0e24a20c1e51a909b52965042650cb7..fb3ad6819a16e7cace4b7ce0cb3c9708c8181179 100755 (executable)
@@ -139,6 +139,16 @@ def java_c_types(fn_arg, ret_arr_len):
         assert var_is_arr_regex.match(fn_arg[8:])
         rust_obj = "LDKThirtyTwoBytes"
         arr_access = "data"
+    elif fn_arg.startswith("LDKU128"):
+        if fn_arg == "LDKU128":
+            fn_arg = "LDKU128 arg"
+        if fn_arg.startswith("LDKU128*") or fn_arg.startswith("LDKU128 *"):
+            fn_arg = "uint8_t (" + fn_arg[8:] + ")[16]"
+        else:
+            fn_arg = "uint8_t (*" + fn_arg[8:] + ")[16]"
+        assert var_is_arr_regex.match(fn_arg[8:])
+        rust_obj = "LDKU128"
+        arr_access = "le_bytes"
     elif fn_arg.startswith("LDKTxid"):
         fn_arg = "uint8_t (*" + fn_arg[8:] + ")[32]"
         assert var_is_arr_regex.match(fn_arg[8:])
@@ -381,6 +391,8 @@ def java_c_types(fn_arg, ret_arr_len):
         else:
             java_ty = java_ty + "[]"
             java_hu_ty = java_ty
+        if rust_obj == "LDKU128":
+            java_hu_ty = consts.u128_native_ty
         c_ty = c_ty + "Array"
 
         subty = java_c_types(arr_ty, None)
@@ -551,7 +563,6 @@ with open(sys.argv[1]) as in_h, open(f"{sys.argv[2]}/bindings{consts.file_ext}",
         default_constructor_args = {}
         takes_self = False
         takes_self_ptr = False
-        args_known = True
 
         for argument_index, argument in enumerate(method_arguments):
             arg_ty = type_mapping_generator.java_c_types(argument, None)
@@ -585,13 +596,12 @@ with open(sys.argv[1]) as in_h, open(f"{sys.argv[2]}/bindings{consts.file_ext}",
             if argument_conversion_info.arg_conv is not None and "WARNING" in argument_conversion_info.arg_conv:
                 if argument_conversion_info.rust_obj in constructor_fns:
                     assert not is_free
-                    for explode_arg in constructor_fns[argument_conversion_info.rust_obj].split(','):
+                    for explode_idx, explode_arg in enumerate(constructor_fns[argument_conversion_info.rust_obj].split(',')):
                         explode_arg_conv = type_mapping_generator.map_type(explode_arg, False, None, False, True)
+                        if explode_idx == 0 and explode_arg_conv.c_ty == "void":
+                            continue # (void) is C lingo for "no arguments)
                         if explode_arg_conv.c_ty == "void":
-                            # We actually want to handle this case, but for now its only used in NetGraphMsgHandler::new()
-                            # which ends up resulting in a redundant constructor - both without arguments for the NetworkGraph.
-                            args_known = False
-                            pass
+                            assert False
                         if not argument_conversion_info.arg_name in default_constructor_args:
                             default_constructor_args[argument_conversion_info.arg_name] = []
                         default_constructor_args[argument_conversion_info.arg_name].append(explode_arg_conv)
@@ -607,7 +617,7 @@ with open(sys.argv[1]) as in_h, open(f"{sys.argv[2]}/bindings{consts.file_ext}",
             expected_struct in complex_enums or expected_struct in complex_enums or
             expected_struct in result_types or expected_struct in tuple_types) and not is_free
         impl_on_utils = not impl_on_struct and (not is_free and not method_name.endswith("_clone") and
-            not method_name.startswith("TxOut") and
+            not method_name.startswith("TxOut") and not method_name.startswith("BigEndianScalar") and
             not method_name.startswith("_") and
             method_name != "check_platform" and method_name != "Result_read" and
             not expected_struct in unitary_enums and
@@ -625,6 +635,7 @@ with open(sys.argv[1]) as in_h, open(f"{sys.argv[2]}/bindings{consts.file_ext}",
                         arg.from_hu_conv = (arg.from_hu_conv[0], "")
 
         out_java.write("\t// " + line)
+        args_known = True # We no longer ever set this to false
         (out_java_delta, out_c_delta, out_java_struct_delta) = \
             consts.map_function(argument_types, c_call_string, method_name, struct_meth_name, return_type_info, struct_meth, default_constructor_args, takes_self, takes_self_ptr, args_known, type_mapping_generator, doc_comment)
         out_java.write(out_java_delta)
@@ -756,9 +767,8 @@ with open(sys.argv[1]) as in_h, open(f"{sys.argv[2]}/bindings{consts.file_ext}",
                 else:
                     (nullable_params, ret_nullable) = doc_to_params_ret_nullable(fn_docs)
                     if ret_nullable:
-                        assert False # This isn't yet handled on the Java side
-                        ret_ty_info.nullable = True
                         ret_ty_info = type_mapping_generator.map_nullable_type(fn_line.group(2).strip() + " ret", True, None, False, False)
+                        ret_ty_info.nullable = True
                     else:
                         ret_ty_info = type_mapping_generator.map_type(fn_line.group(2).strip() + " ret", True, None, False, False)
                     is_const = fn_line.group(4) is not None
@@ -1054,8 +1064,27 @@ with open(sys.argv[1]) as in_h, open(f"{sys.argv[2]}/bindings{consts.file_ext}",
                         write_c("\treturn thing->value;")
                         write_c("}")
                         map_fn(fn_line + "\n", re.compile("(.*) (TxOut_get_value) \((.*)\)").match(fn_line), None, None, None)
+                elif struct_name == "LDKBigEndianScalar":
+                    with open(f"{sys.argv[3]}/structs/BigEndianScalar{consts.file_ext}", "w") as out_java_struct:
+                        out_java_struct.write(consts.hu_struct_file_prefix)
+                        out_java_struct.write(consts.scalar_defn)
+                        fn_line = "struct LDKThirtyTwoBytes BigEndianScalar_get_bytes (struct LDKBigEndianScalar* thing)"
+                        write_c(fn_line + " {\n")
+                        write_c("\tLDKThirtyTwoBytes ret = { .data = *thing->big_endian_bytes };\n")
+                        write_c("\treturn ret;\n")
+                        write_c("}\n")
+                        map_fn(fn_line + "\n", re.compile("(.*) (BigEndianScalar_get_bytes) \((.*)\)").match(fn_line), None, None, None)
+
+                        # We need to be able to FREE a heap-allocated BigEndianScalar, but because
+                        # there's nothing heap-allocated inside it the C bindings don't bother
+                        # exposing a `_free` method. Instead, we have to manually write one here,
+                        # though it doesn't need to do anything, the autogenerated wrapper will do
+                        # the required FREE.
+                        fn_line = "static void BigEndianScalar_free (struct LDKBigEndianScalar thing)"
+                        write_c(fn_line + " {}\n")
+                        map_fn(fn_line + "\n", re.compile("static (.*) (BigEndianScalar_free) \((.*)\)").match(fn_line), None, None, None)
                 else:
-                    pass # Everything remaining is a byte[] or some form
+                    pass # Everything remaining is a byte[] of some form
                 cur_block_obj = None
         else:
             fn_ptr = fn_ptr_regex.match(line)