_ Git - ldk-java/blob - genbindings.py

   1 #!/usr/bin/env python3
   2 import sys, re
   3
   4 if len(sys.argv) != 4:
   5     print("USAGE: /path/to/lightning.h /path/to/bindings/output.java /path/to/bindings/output.c")
   6     sys.exit(1)
   7
   8 class TypeInfo:
   9     def __init__(self, rust_obj, java_ty, java_fn_ty_arg, c_ty, passed_as_ptr, is_ptr, var_name, arr_len):
  10         self.rust_obj = rust_obj
  11         self.java_ty = java_ty
  12         self.java_fn_ty_arg = java_fn_ty_arg
  13         self.c_ty = c_ty
  14         self.passed_as_ptr = passed_as_ptr
  15         self.is_ptr = is_ptr
  16         self.var_name = var_name
  17         self.arr_len = arr_len
  18
  19 class ConvInfo:
  20     def __init__(self, ty_info, arg_name, arg_conv, arg_conv_name, ret_conv, ret_conv_name):
  21         assert(ty_info.c_ty is not None)
  22         assert(ty_info.java_ty is not None)
  23         assert(arg_name is not None)
  24         self.c_ty = ty_info.c_ty
  25         self.java_ty = ty_info.java_ty
  26         self.java_fn_ty_arg = ty_info.java_fn_ty_arg
  27         self.arg_name = arg_name
  28         self.arg_conv = arg_conv
  29         self.arg_conv_name = arg_conv_name
  30         self.ret_conv = ret_conv
  31         self.ret_conv_name = ret_conv_name
  32
  33     def print_ty(self):
  34         out_c.write(self.c_ty)
  35         out_java.write(self.java_ty)
  36
  37     def print_name(self):
  38         if self.arg_name != "":
  39             out_java.write(" " + self.arg_name)
  40             out_c.write(" " + self.arg_name)
  41         else:
  42             out_java.write(" arg")
  43             out_c.write(" arg")
  44
  45 with open(sys.argv[1]) as in_h, open(sys.argv[2], "w") as out_java, open(sys.argv[3], "w") as out_c:
  46     opaque_structs = set()
  47     trait_structs = set()
  48
  49     var_is_arr_regex = re.compile("\(\*([A-za-z_]*)\)\[([0-9]*)\]")
  50     var_ty_regex = re.compile("([A-za-z_0-9]*)(.*)")
  51     def java_c_types(fn_arg, ret_arr_len):
  52         fn_arg = fn_arg.strip()
  53         if fn_arg.startswith("MUST_USE_RES "):
  54             fn_arg = fn_arg[13:]
  55         is_const = False
  56         if fn_arg.startswith("const "):
  57             fn_arg = fn_arg[6:]
  58             is_const = True
  59
  60         is_ptr = False
  61         take_by_ptr = False
  62         rust_obj = None
  63         if fn_arg.startswith("void"):
  64             java_ty = "void"
  65             c_ty = "void"
  66             fn_ty_arg = "V"
  67             fn_arg = fn_arg[4:].strip()
  68         elif fn_arg.startswith("bool"):
  69             java_ty = "boolean"
  70             c_ty = "jboolean"
  71             fn_ty_arg = "Z"
  72             fn_arg = fn_arg[4:].strip()
  73         elif fn_arg.startswith("uint8_t"):
  74             java_ty = "byte"
  75             c_ty = "jbyte"
  76             fn_ty_arg = "B"
  77             fn_arg = fn_arg[7:].strip()
  78         elif fn_arg.startswith("uint16_t"):
  79             java_ty = "short"
  80             c_ty = "jshort"
  81             fn_ty_arg = "S"
  82             fn_arg = fn_arg[8:].strip()
  83         elif fn_arg.startswith("uint32_t"):
  84             java_ty = "int"
  85             c_ty = "jint"
  86             fn_ty_arg = "I"
  87             fn_arg = fn_arg[8:].strip()
  88         elif fn_arg.startswith("uint64_t"):
  89             java_ty = "long"
  90             c_ty = "jlong"
  91             fn_ty_arg = "J"
  92             fn_arg = fn_arg[8:].strip()
  93         elif is_const and fn_arg.startswith("char *"):
  94             java_ty = "String"
  95             c_ty = "const char*"
  96             fn_ty_arg = "Ljava/lang/String;"
  97             fn_arg = fn_arg[6:].strip()
  98         else:
  99             ma = var_ty_regex.match(fn_arg)
 100             java_ty = "long"
 101             c_ty = "jlong"
 102             fn_ty_arg = "J"
 103             fn_arg = ma.group(2).strip()
 104             rust_obj = ma.group(1).strip()
 105             take_by_ptr = True
 106
 107         if fn_arg.startswith(" *") or fn_arg.startswith("*"):
 108             fn_arg = fn_arg.replace("*", "").strip()
 109             is_ptr = True
 110             c_ty = "jlong"
 111             java_ty = "long"
 112
 113         var_is_arr = var_is_arr_regex.match(fn_arg)
 114         if var_is_arr is not None or ret_arr_len is not None:
 115             assert(not take_by_ptr)
 116             assert(not is_ptr)
 117             java_ty = java_ty + "[]"
 118             c_ty = c_ty + "Array"
 119             if var_is_arr is not None:
 120                 return TypeInfo(rust_obj=None, java_ty=java_ty, java_fn_ty_arg="[" + fn_ty_arg, c_ty=c_ty,
 121                     passed_as_ptr=False, is_ptr=False, var_name=var_is_arr.group(1), arr_len=var_is_arr.group(2))
 122         return TypeInfo(rust_obj=rust_obj, java_ty=java_ty, java_fn_ty_arg=fn_ty_arg, c_ty=c_ty, passed_as_ptr=is_ptr or take_by_ptr,
 123             is_ptr=is_ptr, var_name=fn_arg, arr_len=None)
 124
 125     def map_type(fn_arg, print_void, ret_arr_len, is_free):
 126         ty_info = java_c_types(fn_arg, ret_arr_len)
 127
 128         if ty_info.c_ty == "void":
 129             if not print_void:
 130                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 131                     arg_conv = None, arg_conv_name = None, ret_conv = None, ret_conv_name = None)
 132
 133         if ty_info.c_ty.endswith("Array"):
 134             arr_len = ty_info.arr_len
 135             if arr_len is not None:
 136                 arr_name = ty_info.var_name
 137             else:
 138                 arr_name = "ret"
 139                 arr_len = ret_arr_len
 140             assert(ty_info.c_ty == "jbyteArray")
 141             return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 142                 arg_conv = "unsigned char " + arr_name + "_arr[" + arr_len + "];\n" +
 143                     "(*_env)->GetByteArrayRegion (_env, """ + arr_name + ", 0, " + arr_len + ", " + arr_name + "_arr);\n" +
 144                     "unsigned char (*""" + arr_name + "_ref)[" + arr_len + "] = &" + arr_name + "_arr;",
 145                 arg_conv_name = arr_name + "_ref",
 146                 ret_conv = ("jbyteArray " + arr_name + "_arr = (*_env)->NewByteArray(_env, " + arr_len + ");\n" +
 147                     "(*_env)->SetByteArrayRegion(_env, " + arr_name + "_arr, 0, " + arr_len + ", *",
 148                     ");"),
 149                 ret_conv_name = arr_name + "_arr")
 150         elif ty_info.var_name != "":
 151             # If we have a parameter name, print it (noting that it may indicate its a pointer)
 152             if ty_info.rust_obj is not None:
 153                 assert(ty_info.passed_as_ptr)
 154                 if not ty_info.is_ptr:
 155                     if ty_info.rust_obj in trait_structs:
 156                         base_conv = ty_info.rust_obj + " *" + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)" + ty_info.var_name + ";"
 157                         if not is_free:
 158                             base_conv = base_conv + "\n" + ty_info.rust_obj + "_JCalls_clone(" + ty_info.var_name + "_conv->this_arg);"
 159                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 160                             arg_conv = base_conv,
 161                             arg_conv_name = "*" + ty_info.var_name + "_conv",
 162                             ret_conv = None, ret_conv_name = None)
 163                     base_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv = *(" + ty_info.rust_obj + "*)" + ty_info.var_name + ";\nfree((void*)" + ty_info.var_name + ");";
 164                     if ty_info.rust_obj in opaque_structs:
 165                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 166                             arg_conv = base_conv + "\n" + ty_info.var_name + "_conv._underlying_ref = false;",
 167                             arg_conv_name = ty_info.var_name + "_conv",
 168                             ret_conv = None, ret_conv_name = None)
 169
 170                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 171                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv",
 172                         ret_conv = None, ret_conv_name = None)
 173                 else:
 174                     assert(not is_free)
 175                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 176                         arg_conv = ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)" + ty_info.var_name + ";",
 177                         arg_conv_name = ty_info.var_name + "_conv",
 178                         ret_conv = None, ret_conv_name = None)
 179             elif ty_info.is_ptr:
 180                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 181                     arg_conv = None, arg_conv_name = ty_info.var_name, ret_conv = None, ret_conv_name = None)
 182             elif ty_info.java_ty == "String":
 183                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 184                     arg_conv = None, arg_conv_name = None,
 185                     ret_conv = ("jstring " + ty_info.var_name + "_conv = (*_env)->NewStringUTF(_env, ", ");"), ret_conv_name = ty_info.var_name + "_conv")
 186             else:
 187                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 188                     arg_conv = None, arg_conv_name = ty_info.var_name, ret_conv = None, ret_conv_name = None)
 189         elif not print_void:
 190             # We don't have a parameter name, and want one, just call it arg
 191             if ty_info.rust_obj is not None:
 192                 assert(not is_free or ty_info.rust_obj not in opaque_structs);
 193                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 194                     arg_conv = ty_info.rust_obj + " arg_conv = *(" + ty_info.rust_obj + "*)arg;\nfree((void*)arg);",
 195                     arg_conv_name = "arg_conv",
 196                     ret_conv = None, ret_conv_name = None)
 197             else:
 198                 assert(not is_free)
 199                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 200                     arg_conv = None, arg_conv_name = "arg", ret_conv = None, ret_conv_name = None)
 201         else:
 202             # We don't have a parameter name, and don't want one (cause we're returning)
 203             if ty_info.rust_obj is not None:
 204                 if not ty_info.is_ptr:
 205                     if ty_info.rust_obj in opaque_structs:
 206                         # If we're returning a newly-allocated struct, we don't want Rust to ever
 207                         # free, instead relying on the Java GC to lose the ref. We undo this in
 208                         # any _free function.
 209                         # To avoid any issues, we first assert that the incoming object is non-ref.
 210                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 211                             ret_conv = (ty_info.rust_obj + "* ret = malloc(sizeof(" + ty_info.rust_obj + "));\n*ret = ", ";\nassert(!ret->_underlying_ref);\nret->_underlying_ref = true;"),
 212                             ret_conv_name = "(long)ret",
 213                             arg_conv = None, arg_conv_name = None)
 214                     else:
 215                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 216                             ret_conv = (ty_info.rust_obj + "* ret = malloc(sizeof(" + ty_info.rust_obj + "));\n*ret = ", ";"),
 217                             ret_conv_name = "(long)ret",
 218                             arg_conv = None, arg_conv_name = None)
 219                 else:
 220                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 221                         ret_conv = ("long ret = (long)", ";"), ret_conv_name = "ret",
 222                         arg_conv = None, arg_conv_name = None)
 223             else:
 224                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 225                     arg_conv = None, arg_conv_name = None, ret_conv = None, ret_conv_name = None)
 226
 227     def map_fn(re_match, ret_arr_len):
 228         out_java.write("\t/// " + line)
 229         out_java.write("\tpublic static native ")
 230         out_c.write("JNIEXPORT ")
 231
 232         ret_info = map_type(re_match.group(1), True, ret_arr_len, False)
 233         ret_info.print_ty()
 234         if ret_info.ret_conv is not None:
 235             ret_conv_pfx, ret_conv_sfx = ret_info.ret_conv
 236
 237         out_java.write(" " + re_match.group(2) + "(")
 238         out_c.write(" JNICALL Java_org_ldk_impl_bindings_" + re_match.group(2).replace('_', '_1') + "(JNIEnv * _env, jclass _b")
 239
 240         arg_names = []
 241         for idx, arg in enumerate(re_match.group(3).split(',')):
 242             if idx != 0:
 243                 out_java.write(", ")
 244             if arg != "void":
 245                 out_c.write(", ")
 246             arg_conv_info = map_type(arg, False, None, re_match.group(2).endswith("_free"))
 247             if arg_conv_info.c_ty != "void":
 248                 arg_conv_info.print_ty()
 249                 arg_conv_info.print_name()
 250             arg_names.append(arg_conv_info)
 251
 252         out_java.write(");\n")
 253         out_c.write(") {\n")
 254
 255         for info in arg_names:
 256             if info.arg_conv is not None:
 257                 out_c.write("\t" + info.arg_conv.replace('\n', "\n\t") + "\n");
 258
 259         if ret_info.ret_conv is not None:
 260             out_c.write("\t" + ret_conv_pfx.replace('\n', '\n\t'));
 261         else:
 262             out_c.write("\treturn ");
 263
 264         out_c.write(re_match.group(2) + "(")
 265         for idx, info in enumerate(arg_names):
 266             if info.arg_conv_name is not None:
 267                 if idx != 0:
 268                     out_c.write(", ")
 269                 out_c.write(info.arg_conv_name)
 270         out_c.write(")")
 271         if ret_info.ret_conv is not None:
 272             out_c.write(ret_conv_sfx.replace('\n', '\n\t'))
 273             out_c.write("\n\treturn " + ret_info.ret_conv_name + ";")
 274         else:
 275             out_c.write(";")
 276         out_c.write("\n}\n\n")
 277
 278     out_java.write("""package org.ldk.impl;
 279
 280 public class bindings {
 281         static {
 282                 System.loadLibrary(\"lightningjni\");
 283         }
 284
 285 """)
 286     out_c.write("#include \"org_ldk_impl_bindings.h\"\n")
 287     out_c.write("#include <rust_types.h>\n")
 288     out_c.write("#include <lightning.h>\n")
 289     out_c.write("#include <assert.h>\n")
 290     out_c.write("#include <string.h>\n")
 291     out_c.write("#include <stdatomic.h>\n\n")
 292
 293     # XXX: Temporarily write out a manual SecretKey_new() for testing, we should auto-gen this kind of thing
 294     out_java.write("\tpublic static native long LDKSecretKey_new();\n\n") # TODO: rm me
 295     out_c.write("JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_LDKSecretKey_1new(JNIEnv * _env, jclass _b) {\n") # TODO: rm me
 296     out_c.write("\tLDKSecretKey* key = (LDKSecretKey*)malloc(sizeof(LDKSecretKey));\n") # TODO: rm me
 297     out_c.write("\treturn (long)key;\n") # TODO: rm me
 298     out_c.write("}\n") # TODO: rm me
 299
 300     in_block_comment = False
 301     in_block_enum = False
 302     cur_block_struct = None
 303     in_block_union = False
 304
 305     fn_ptr_regex = re.compile("^extern const ([A-Za-z_0-9\* ]*) \(\*(.*)\)\((.*)\);$")
 306     fn_ret_arr_regex = re.compile("(.*) \(\*(.*)\((.*)\)\)\[([0-9]*)\];$")
 307     reg_fn_regex = re.compile("([A-Za-z_0-9\* ]* \*?)([a-zA-Z_0-9]*)\((.*)\);$")
 308     const_val_regex = re.compile("^extern const ([A-Za-z_0-9]*) ([A-Za-z_0-9]*);$")
 309
 310     line_indicates_opaque_regex = re.compile("^   bool _underlying_ref;$")
 311     line_indicates_trait_regex = re.compile("^   ([A-Za-z_0-9]* \*?)\(\*([A-Za-z_0-9]*)\)\((const )?void \*this_arg(.*)\);$")
 312     assert(line_indicates_trait_regex.match("   uintptr_t (*send_data)(void *this_arg, LDKu8slice data, bool resume_read);"))
 313     assert(line_indicates_trait_regex.match("   LDKCVec_MessageSendEventZ (*get_and_clear_pending_msg_events)(const void *this_arg);"))
 314     assert(line_indicates_trait_regex.match("   void *(*clone)(const void *this_arg);"))
 315     line_field_var_regex = re.compile("^   ([A-Za-z_0-9]*) ([A-Za-z_0-9]*);$")
 316     assert(line_field_var_regex.match("   LDKMessageSendEventsProvider MessageSendEventsProvider;"))
 317     struct_name_regex = re.compile("^typedef struct (MUST_USE_STRUCT )?(LDK[A-Za-z_0-9]*) {$")
 318     assert(struct_name_regex.match("typedef struct LDKCVecTempl_u8 {"))
 319
 320     for line in in_h:
 321         if in_block_comment:
 322             #out_java.write("\t" + line)
 323             if line.endswith("*/\n"):
 324                 in_block_comment = False
 325         elif cur_block_struct is not None:
 326             cur_block_struct  = cur_block_struct + line
 327             if line.startswith("} "):
 328                 field_lines = []
 329                 struct_name = None
 330                 struct_lines = cur_block_struct.split("\n")
 331                 is_opaque = False
 332                 trait_fn_lines = []
 333                 field_var_lines = []
 334
 335                 for idx, struct_line in enumerate(struct_lines):
 336                     if struct_line.strip().startswith("/*"):
 337                         in_block_comment = True
 338                     if in_block_comment:
 339                         if struct_line.endswith("*/"):
 340                             in_block_comment = False
 341                     else:
 342                         struct_name_match = struct_name_regex.match(struct_line)
 343                         if struct_name_match is not None:
 344                             struct_name = struct_name_match.group(2)
 345                         if line_indicates_opaque_regex.match(struct_line):
 346                             is_opaque = True
 347                         trait_fn_match = line_indicates_trait_regex.match(struct_line)
 348                         if trait_fn_match is not None:
 349                             trait_fn_lines.append(trait_fn_match)
 350                         field_var_match = line_field_var_regex.match(struct_line)
 351                         if field_var_match is not None:
 352                             field_var_lines.append(field_var_match)
 353                         field_lines.append(struct_line)
 354
 355                 assert(struct_name is not None)
 356                 assert(len(trait_fn_lines) == 0 or not is_opaque)
 357                 if is_opaque:
 358                     opaque_structs.add(struct_name)
 359                 if len(trait_fn_lines) > 0:
 360                     trait_structs.add(struct_name)
 361                     out_c.write("typedef struct " + struct_name + "_JCalls {\n")
 362                     out_c.write("\tatomic_size_t refcnt;\n")
 363                     out_c.write("\tJNIEnv *env;\n")
 364                     out_c.write("\tjobject o;\n")
 365                     for var_line in field_var_lines:
 366                         if var_line.group(1) in trait_structs:
 367                             out_c.write("\t" + var_line.group(1) + "_JCalls* " + var_line.group(2) + ";\n")
 368                     for fn_line in trait_fn_lines:
 369                         if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
 370                             out_c.write("\tjmethodID " + fn_line.group(2) + "_meth;\n")
 371                     out_c.write("} " + struct_name + "_JCalls;\n")
 372
 373                     out_java.write("\tpublic interface " + struct_name + " {\n")
 374                     java_meths = []
 375                     for fn_line in trait_fn_lines:
 376                         java_meth_descr = "("
 377                         if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
 378                             ret_ty_info = java_c_types(fn_line.group(1), None)
 379
 380                             out_java.write("\t\t " + ret_ty_info.java_ty + " " + fn_line.group(2) + "(")
 381                             is_const = fn_line.group(3) is not None
 382                             out_c.write(fn_line.group(1) + fn_line.group(2) + "_jcall(")
 383                             if is_const:
 384                                 out_c.write("const void* this_arg")
 385                             else:
 386                                 out_c.write("void* this_arg")
 387
 388                             arg_names = []
 389                             for idx, arg in enumerate(fn_line.group(4).split(',')):
 390                                 if arg == "":
 391                                     continue
 392                                 if idx >= 2:
 393                                     out_java.write(", ")
 394                                 out_c.write(", ")
 395                                 arg_conv_info = map_type(arg, True, None, False)
 396                                 out_c.write(arg.strip())
 397                                 out_java.write(arg_conv_info.java_ty + " " + arg_conv_info.arg_name)
 398                                 arg_names.append(arg_conv_info)
 399                                 java_meth_descr = java_meth_descr + arg_conv_info.java_fn_ty_arg
 400                             java_meth_descr = java_meth_descr + ")" + ret_ty_info.java_fn_ty_arg
 401                             java_meths.append(java_meth_descr)
 402
 403                             out_java.write(");\n")
 404                             out_c.write(") {\n")
 405                             out_c.write("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
 406
 407                             for arg_info in arg_names:
 408                                 if arg_info.ret_conv is not None:
 409                                     out_c.write("\t" + arg_info.ret_conv[0].replace('\n', '\n\t').replace("_env", "j_calls->env"));
 410                                     out_c.write(arg_info.arg_name)
 411                                     out_c.write(arg_info.ret_conv[1].replace('\n', '\n\t').replace("_env", "j_calls->env") + "\n")
 412
 413                             if not ret_ty_info.passed_as_ptr:
 414                                 out_c.write("\treturn (*j_calls->env)->Call" + ret_ty_info.java_ty.title() + "Method(j_calls->env, j_calls->o, j_calls->" + fn_line.group(2) + "_meth")
 415                             else:
 416                                 out_c.write("\t" + fn_line.group(1).strip() + "* ret = (" + fn_line.group(1).strip() + "*)(*j_calls->env)->CallLongMethod(j_calls->env, j_calls->o, j_calls->" + fn_line.group(2) + "_meth");
 417
 418                             for arg_info in arg_names:
 419                                 if arg_info.ret_conv is not None:
 420                                     out_c.write(", " + arg_info.ret_conv_name)
 421                                 else:
 422                                     out_c.write(", " + arg_info.arg_name)
 423                             out_c.write(");\n");
 424
 425                             if ret_ty_info.passed_as_ptr:
 426                                 out_c.write("\t" + fn_line.group(1).strip() + " res = *ret;\n")
 427                                 out_c.write("\tfree(ret);\n")
 428                                 out_c.write("\treturn res;\n")
 429                             out_c.write("}\n")
 430                         elif fn_line.group(2) == "free":
 431                             out_c.write("void " + struct_name + "_JCalls_free(void* this_arg) {\n")
 432                             out_c.write("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
 433                             out_c.write("\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n")
 434                             out_c.write("\t\t(*j_calls->env)->DeleteGlobalRef(j_calls->env, j_calls->o);\n")
 435                             out_c.write("\t\tfree(j_calls);\n")
 436                             out_c.write("\t}\n}\n")
 437
 438                     # Write out a clone function whether we need one or not, as we use them in moving to rust
 439                     out_c.write("void* " + struct_name + "_JCalls_clone(const void* this_arg) {\n")
 440                     out_c.write("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
 441                     out_c.write("\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n")
 442                     for var_line in field_var_lines:
 443                         if var_line.group(1) in trait_structs:
 444                             out_c.write("\tatomic_fetch_add_explicit(&j_calls->" + var_line.group(2) + "->refcnt, 1, memory_order_release);\n")
 445                     out_c.write("\treturn (void*) this_arg;\n")
 446                     out_c.write("}\n")
 447
 448                     out_java.write("\t}\n")
 449
 450                     out_java.write("\tpublic static native long " + struct_name + "_new(" + struct_name + " impl")
 451                     out_c.write("JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1new (JNIEnv * env, jclass _a, jobject o")
 452                     for var_line in field_var_lines:
 453                         if var_line.group(1) in trait_structs:
 454                             out_java.write(", " + var_line.group(1) + " " + var_line.group(2))
 455                             out_c.write(", jobject " + var_line.group(2))
 456                     out_java.write(");\n")
 457                     out_c.write(") {\n")
 458
 459                     out_c.write("\tjclass c = (*env)->GetObjectClass(env, o);\n")
 460                     out_c.write("\tassert(c != NULL);\n")
 461                     out_c.write("\t" + struct_name + "_JCalls *calls = malloc(sizeof(" + struct_name + "_JCalls));\n")
 462                     out_c.write("\tatomic_init(&calls->refcnt, 1);\n")
 463                     out_c.write("\tcalls->env = env;\n")
 464                     out_c.write("\tcalls->o = (*env)->NewGlobalRef(env, o);\n")
 465                     for (fn_line, java_meth_descr) in zip(trait_fn_lines, java_meths):
 466                         if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
 467                             out_c.write("\tcalls->" + fn_line.group(2) + "_meth = (*env)->GetMethodID(env, c, \"" + fn_line.group(2) + "\", \"" + java_meth_descr + "\");\n")
 468                             out_c.write("\tassert(calls->" + fn_line.group(2) + "_meth != NULL);\n")
 469                     out_c.write("\n\t" + struct_name + " *ret = malloc(sizeof(" + struct_name + "));\n")
 470                     out_c.write("\tret->this_arg = (void*) calls;\n")
 471                     for fn_line in trait_fn_lines:
 472                         if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
 473                             out_c.write("\tret->" + fn_line.group(2) + " = " + fn_line.group(2) + "_jcall;\n")
 474                         elif fn_line.group(2) == "free":
 475                             out_c.write("\tret->free = " + struct_name + "_JCalls_free;\n")
 476                         else:
 477                             out_c.write("\tret->clone = " + struct_name + "_JCalls_clone;\n")
 478                     for var_line in field_var_lines:
 479                         if var_line.group(1) in trait_structs:
 480                             out_c.write("\tret->" + var_line.group(2) + " = *(" + var_line.group(1) + "*)Java_org_ldk_impl_bindings_" + var_line.group(1) + "_1new(env, _a, " + var_line.group(2) + ");\n")
 481                             out_c.write("\tcalls->" + var_line.group(2) + " = ret->" + var_line.group(2) + ".this_arg;\n")
 482                     out_c.write("\treturn (long)ret;\n")
 483                     out_c.write("}\n\n")
 484
 485                     #out_java.write("/* " + "\n".join(field_lines) + "*/\n")
 486                 cur_block_struct = None
 487         elif in_block_union:
 488             if line.startswith("} "):
 489                 in_block_union = False
 490         elif in_block_enum:
 491             if line.startswith("} "):
 492                 in_block_enum = False
 493         else:
 494             fn_ptr = fn_ptr_regex.match(line)
 495             fn_ret_arr = fn_ret_arr_regex.match(line)
 496             reg_fn = reg_fn_regex.match(line)
 497             const_val = const_val_regex.match(line)
 498
 499             if line.startswith("#include <"):
 500                 pass
 501             elif line.startswith("/*"):
 502                 #out_java.write("\t" + line)
 503                 if not line.endswith("*/\n"):
 504                     in_block_comment = True
 505             elif line.startswith("typedef enum "):
 506                 in_block_enum = True
 507             elif line.startswith("typedef struct "):
 508                 cur_block_struct = line
 509             elif line.startswith("typedef union "):
 510                 in_block_union = True
 511             elif line.startswith("typedef "):
 512                 pass
 513             elif fn_ptr is not None:
 514                 map_fn(fn_ptr, None)
 515             elif fn_ret_arr is not None:
 516                 map_fn(fn_ret_arr, fn_ret_arr.group(4))
 517             elif reg_fn is not None:
 518                 map_fn(reg_fn, None)
 519             elif const_val_regex is not None:
 520                 # TODO Map const variables
 521                 pass
 522             else:
 523                 assert(line == "\n")
 524
 525     out_java.write("}\n")