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

   1 #!/usr/bin/env python3
   2 import sys, re
   3
   4 if len(sys.argv) != 5:
   5     print("USAGE: /path/to/lightning.h /path/to/bindings/output.java /path/to/bindings/output.c debug")
   6     print("debug should be true or false and indicates whether to track allocations and ensure we don't leak")
   7     sys.exit(1)
   8
   9 class TypeInfo:
  10     def __init__(self, rust_obj, java_ty, java_fn_ty_arg, c_ty, passed_as_ptr, is_ptr, var_name, arr_len):
  11         self.rust_obj = rust_obj
  12         self.java_ty = java_ty
  13         self.java_fn_ty_arg = java_fn_ty_arg
  14         self.c_ty = c_ty
  15         self.passed_as_ptr = passed_as_ptr
  16         self.is_ptr = is_ptr
  17         self.var_name = var_name
  18         self.arr_len = arr_len
  19
  20 class ConvInfo:
  21     def __init__(self, ty_info, arg_name, arg_conv, arg_conv_name, ret_conv, ret_conv_name):
  22         assert(ty_info.c_ty is not None)
  23         assert(ty_info.java_ty is not None)
  24         assert(arg_name is not None)
  25         self.c_ty = ty_info.c_ty
  26         self.java_ty = ty_info.java_ty
  27         self.java_fn_ty_arg = ty_info.java_fn_ty_arg
  28         self.arg_name = arg_name
  29         self.arg_conv = arg_conv
  30         self.arg_conv_name = arg_conv_name
  31         self.ret_conv = ret_conv
  32         self.ret_conv_name = ret_conv_name
  33
  34     def print_ty(self):
  35         out_c.write(self.c_ty)
  36         out_java.write(self.java_ty)
  37
  38     def print_name(self):
  39         if self.arg_name != "":
  40             out_java.write(" " + self.arg_name)
  41             out_c.write(" " + self.arg_name)
  42         else:
  43             out_java.write(" arg")
  44             out_c.write(" arg")
  45
  46 with open(sys.argv[1]) as in_h, open(sys.argv[2], "w") as out_java, open(sys.argv[3], "w") as out_c:
  47     opaque_structs = set()
  48     trait_structs = set()
  49     unitary_enums = set()
  50
  51     var_is_arr_regex = re.compile("\(\*([A-za-z_]*)\)\[([0-9]*)\]")
  52     var_ty_regex = re.compile("([A-za-z_0-9]*)(.*)")
  53     def java_c_types(fn_arg, ret_arr_len):
  54         fn_arg = fn_arg.strip()
  55         if fn_arg.startswith("MUST_USE_RES "):
  56             fn_arg = fn_arg[13:]
  57         is_const = False
  58         if fn_arg.startswith("const "):
  59             fn_arg = fn_arg[6:]
  60             is_const = True
  61
  62         is_ptr = False
  63         take_by_ptr = False
  64         rust_obj = None
  65         if fn_arg.startswith("void"):
  66             java_ty = "void"
  67             c_ty = "void"
  68             fn_ty_arg = "V"
  69             fn_arg = fn_arg[4:].strip()
  70         elif fn_arg.startswith("bool"):
  71             java_ty = "boolean"
  72             c_ty = "jboolean"
  73             fn_ty_arg = "Z"
  74             fn_arg = fn_arg[4:].strip()
  75         elif fn_arg.startswith("uint8_t"):
  76             java_ty = "byte"
  77             c_ty = "jbyte"
  78             fn_ty_arg = "B"
  79             fn_arg = fn_arg[7:].strip()
  80         elif fn_arg.startswith("uint16_t"):
  81             java_ty = "short"
  82             c_ty = "jshort"
  83             fn_ty_arg = "S"
  84             fn_arg = fn_arg[8:].strip()
  85         elif fn_arg.startswith("uint32_t"):
  86             java_ty = "int"
  87             c_ty = "jint"
  88             fn_ty_arg = "I"
  89             fn_arg = fn_arg[8:].strip()
  90         elif fn_arg.startswith("uint64_t") or fn_arg.startswith("uintptr_t"):
  91             java_ty = "long"
  92             c_ty = "jlong"
  93             fn_ty_arg = "J"
  94             if fn_arg.startswith("uint64_t"):
  95                 fn_arg = fn_arg[8:].strip()
  96             else:
  97                 fn_arg = fn_arg[9:].strip()
  98         elif is_const and fn_arg.startswith("char *"):
  99             java_ty = "String"
 100             c_ty = "const char*"
 101             fn_ty_arg = "Ljava/lang/String;"
 102             fn_arg = fn_arg[6:].strip()
 103         else:
 104             ma = var_ty_regex.match(fn_arg)
 105             if ma.group(1).strip() in unitary_enums:
 106                 java_ty = ma.group(1).strip()
 107                 c_ty = "jclass"
 108                 fn_ty_arg = "Lorg/ldk/impl/bindings$" + ma.group(1).strip() + ";"
 109                 fn_arg = ma.group(2).strip()
 110                 rust_obj = ma.group(1).strip()
 111                 take_by_ptr = True
 112             else:
 113                 java_ty = "long"
 114                 c_ty = "jlong"
 115                 fn_ty_arg = "J"
 116                 fn_arg = ma.group(2).strip()
 117                 rust_obj = ma.group(1).strip()
 118                 take_by_ptr = True
 119
 120         if fn_arg.startswith(" *") or fn_arg.startswith("*"):
 121             fn_arg = fn_arg.replace("*", "").strip()
 122             is_ptr = True
 123             c_ty = "jlong"
 124             java_ty = "long"
 125             fn_ty_arg = "J"
 126
 127         var_is_arr = var_is_arr_regex.match(fn_arg)
 128         if var_is_arr is not None or ret_arr_len is not None:
 129             assert(not take_by_ptr)
 130             assert(not is_ptr)
 131             java_ty = java_ty + "[]"
 132             c_ty = c_ty + "Array"
 133             if var_is_arr is not None:
 134                 return TypeInfo(rust_obj=None, java_ty=java_ty, java_fn_ty_arg="[" + fn_ty_arg, c_ty=c_ty,
 135                     passed_as_ptr=False, is_ptr=False, var_name=var_is_arr.group(1), arr_len=var_is_arr.group(2))
 136         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,
 137             is_ptr=is_ptr, var_name=fn_arg, arr_len=None)
 138
 139     def map_type(fn_arg, print_void, ret_arr_len, is_free):
 140         ty_info = java_c_types(fn_arg, ret_arr_len)
 141
 142         if ty_info.c_ty == "void":
 143             if not print_void:
 144                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 145                     arg_conv = None, arg_conv_name = None, ret_conv = None, ret_conv_name = None)
 146
 147         if ty_info.c_ty.endswith("Array"):
 148             arr_len = ty_info.arr_len
 149             if arr_len is not None:
 150                 arr_name = ty_info.var_name
 151             else:
 152                 arr_name = "ret"
 153                 arr_len = ret_arr_len
 154             assert(ty_info.c_ty == "jbyteArray")
 155             return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 156                 arg_conv = "unsigned char " + arr_name + "_arr[" + arr_len + "];\n" +
 157                     "(*_env)->GetByteArrayRegion (_env, """ + arr_name + ", 0, " + arr_len + ", " + arr_name + "_arr);\n" +
 158                     "unsigned char (*""" + arr_name + "_ref)[" + arr_len + "] = &" + arr_name + "_arr;",
 159                 arg_conv_name = arr_name + "_ref",
 160                 ret_conv = ("jbyteArray " + arr_name + "_arr = (*_env)->NewByteArray(_env, " + arr_len + ");\n" +
 161                     "(*_env)->SetByteArrayRegion(_env, " + arr_name + "_arr, 0, " + arr_len + ", *",
 162                     ");"),
 163                 ret_conv_name = arr_name + "_arr")
 164         elif ty_info.var_name != "":
 165             # If we have a parameter name, print it (noting that it may indicate its a pointer)
 166             if ty_info.rust_obj is not None:
 167                 assert(ty_info.passed_as_ptr)
 168                 if not ty_info.is_ptr:
 169                     if ty_info.rust_obj in unitary_enums:
 170                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 171                             arg_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv = " + ty_info.rust_obj + "_from_java(_env, " + ty_info.var_name + ");",
 172                             arg_conv_name = ty_info.var_name + "_conv",
 173                             ret_conv = ("jclass " + ty_info.var_name + "_conv = " + ty_info.rust_obj + "_to_java(_env, ", ");"),
 174                             ret_conv_name = ty_info.var_name + "_conv")
 175                     base_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv = *(" + ty_info.rust_obj + "*)" + ty_info.var_name + ";";
 176                     if ty_info.rust_obj in trait_structs:
 177                         if not is_free:
 178                             base_conv = base_conv + "\nif (" + ty_info.var_name + "_conv.free == " + ty_info.rust_obj + "_JCalls_free) {\n"
 179                             base_conv = base_conv + "\t// If this_arg is a JCalls struct, then we need to increment the refcnt in it.\n"
 180                             base_conv = base_conv + "\t" + ty_info.rust_obj + "_JCalls_clone(" + ty_info.var_name + "_conv.this_arg);\n}"
 181                         else:
 182                             base_conv = base_conv + "\n" + "FREE((void*)" + ty_info.var_name + ");"
 183                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 184                             arg_conv = base_conv,
 185                             arg_conv_name = ty_info.var_name + "_conv",
 186                             ret_conv = None, ret_conv_name = None)
 187                     base_conv = base_conv + "\nFREE((void*)" + ty_info.var_name + ");";
 188                     if ty_info.rust_obj in opaque_structs:
 189                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 190                             arg_conv = base_conv + "\n" + ty_info.var_name + "_conv.is_owned = true;",
 191                             arg_conv_name = ty_info.var_name + "_conv",
 192                             ret_conv = None, ret_conv_name = None)
 193
 194                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 195                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_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 = ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)" + ty_info.var_name + ";",
 201                         arg_conv_name = ty_info.var_name + "_conv",
 202                         ret_conv = None, ret_conv_name = None)
 203             elif ty_info.is_ptr:
 204                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 205                     arg_conv = None, arg_conv_name = ty_info.var_name, ret_conv = None, ret_conv_name = None)
 206             elif ty_info.java_ty == "String":
 207                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 208                     arg_conv = None, arg_conv_name = None,
 209                     ret_conv = ("jstring " + ty_info.var_name + "_conv = (*_env)->NewStringUTF(_env, ", ");"), ret_conv_name = ty_info.var_name + "_conv")
 210             else:
 211                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 212                     arg_conv = None, arg_conv_name = ty_info.var_name, ret_conv = None, ret_conv_name = None)
 213         elif not print_void:
 214             # We don't have a parameter name, and want one, just call it arg
 215             if ty_info.rust_obj is not None:
 216                 assert(not is_free or ty_info.rust_obj not in opaque_structs);
 217                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 218                     arg_conv = ty_info.rust_obj + " arg_conv = *(" + ty_info.rust_obj + "*)arg;\nFREE((void*)arg);",
 219                     arg_conv_name = "arg_conv",
 220                     ret_conv = None, ret_conv_name = None)
 221             else:
 222                 assert(not is_free)
 223                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 224                     arg_conv = None, arg_conv_name = "arg", ret_conv = None, ret_conv_name = None)
 225         else:
 226             # We don't have a parameter name, and don't want one (cause we're returning)
 227             if ty_info.rust_obj is not None:
 228                 if not ty_info.is_ptr:
 229                     if ty_info.rust_obj in unitary_enums:
 230                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 231                             arg_conv = ty_info.rust_obj + " ret = " + ty_info.rust_obj + "_from_java(_env, " + ty_info.var_name + ");",
 232                             arg_conv_name = "ret",
 233                             ret_conv = ("jclass ret = " + ty_info.rust_obj + "_to_java(_env, ", ");"), ret_conv_name = "ret")
 234                     if ty_info.rust_obj in opaque_structs:
 235                         # If we're returning a newly-allocated struct, we don't want Rust to ever
 236                         # free, instead relying on the Java GC to lose the ref. We undo this in
 237                         # any _free function.
 238                         # To avoid any issues, we first assert that the incoming object is non-ref.
 239                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 240                             ret_conv = (ty_info.rust_obj + "* ret = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n*ret = ", ";\nassert(ret->is_owned);\nret->is_owned = false;"),
 241                             ret_conv_name = "(long)ret",
 242                             arg_conv = None, arg_conv_name = None)
 243                     else:
 244                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 245                             ret_conv = (ty_info.rust_obj + "* ret = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n*ret = ", ";"),
 246                             ret_conv_name = "(long)ret",
 247                             arg_conv = None, arg_conv_name = None)
 248                 else:
 249                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 250                         ret_conv = ("long ret = (long)", ";"), ret_conv_name = "ret",
 251                         arg_conv = None, arg_conv_name = None)
 252             else:
 253                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 254                     arg_conv = None, arg_conv_name = None, ret_conv = None, ret_conv_name = None)
 255
 256     def map_fn(re_match, ret_arr_len):
 257         out_java.write("\t/// " + line)
 258         out_java.write("\tpublic static native ")
 259         out_c.write("JNIEXPORT ")
 260
 261         ret_info = map_type(re_match.group(1), True, ret_arr_len, False)
 262         ret_info.print_ty()
 263         if ret_info.ret_conv is not None:
 264             ret_conv_pfx, ret_conv_sfx = ret_info.ret_conv
 265
 266         out_java.write(" " + re_match.group(2) + "(")
 267         out_c.write(" JNICALL Java_org_ldk_impl_bindings_" + re_match.group(2).replace('_', '_1') + "(JNIEnv * _env, jclass _b")
 268
 269         arg_names = []
 270         for idx, arg in enumerate(re_match.group(3).split(',')):
 271             if idx != 0:
 272                 out_java.write(", ")
 273             if arg != "void":
 274                 out_c.write(", ")
 275             arg_conv_info = map_type(arg, False, None, re_match.group(2).endswith("_free"))
 276             if arg_conv_info.c_ty != "void":
 277                 arg_conv_info.print_ty()
 278                 arg_conv_info.print_name()
 279             arg_names.append(arg_conv_info)
 280
 281         out_java.write(");\n")
 282         out_c.write(") {\n")
 283
 284         for info in arg_names:
 285             if info.arg_conv is not None:
 286                 out_c.write("\t" + info.arg_conv.replace('\n', "\n\t") + "\n");
 287
 288         if ret_info.ret_conv is not None:
 289             out_c.write("\t" + ret_conv_pfx.replace('\n', '\n\t'));
 290         else:
 291             out_c.write("\treturn ");
 292
 293         out_c.write(re_match.group(2) + "(")
 294         for idx, info in enumerate(arg_names):
 295             if info.arg_conv_name is not None:
 296                 if idx != 0:
 297                     out_c.write(", ")
 298                 out_c.write(info.arg_conv_name)
 299         out_c.write(")")
 300         if ret_info.ret_conv is not None:
 301             out_c.write(ret_conv_sfx.replace('\n', '\n\t'))
 302             out_c.write("\n\treturn " + ret_info.ret_conv_name + ";")
 303         else:
 304             out_c.write(";")
 305         out_c.write("\n}\n\n")
 306
 307     def map_trait(struct_name, field_var_lines, trait_fn_lines):
 308         out_c.write("typedef struct " + struct_name + "_JCalls {\n")
 309         out_c.write("\tatomic_size_t refcnt;\n")
 310         out_c.write("\tJNIEnv *env;\n")
 311         out_c.write("\tjobject o;\n")
 312         for var_line in field_var_lines:
 313             if var_line.group(1) in trait_structs:
 314                 out_c.write("\t" + var_line.group(1) + "_JCalls* " + var_line.group(2) + ";\n")
 315         for fn_line in trait_fn_lines:
 316             if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
 317                 out_c.write("\tjmethodID " + fn_line.group(2) + "_meth;\n")
 318         out_c.write("} " + struct_name + "_JCalls;\n")
 319
 320         out_java.write("\tpublic interface " + struct_name + " {\n")
 321         java_meths = []
 322         for fn_line in trait_fn_lines:
 323             java_meth_descr = "("
 324             if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
 325                 ret_ty_info = java_c_types(fn_line.group(1), None)
 326
 327                 out_java.write("\t\t " + ret_ty_info.java_ty + " " + fn_line.group(2) + "(")
 328                 is_const = fn_line.group(3) is not None
 329                 out_c.write(fn_line.group(1) + fn_line.group(2) + "_jcall(")
 330                 if is_const:
 331                     out_c.write("const void* this_arg")
 332                 else:
 333                     out_c.write("void* this_arg")
 334
 335                 arg_names = []
 336                 for idx, arg in enumerate(fn_line.group(4).split(',')):
 337                     if arg == "":
 338                         continue
 339                     if idx >= 2:
 340                         out_java.write(", ")
 341                     out_c.write(", ")
 342                     arg_conv_info = map_type(arg, True, None, False)
 343                     out_c.write(arg.strip())
 344                     out_java.write(arg_conv_info.java_ty + " " + arg_conv_info.arg_name)
 345                     arg_names.append(arg_conv_info)
 346                     java_meth_descr = java_meth_descr + arg_conv_info.java_fn_ty_arg
 347                 java_meth_descr = java_meth_descr + ")" + ret_ty_info.java_fn_ty_arg
 348                 java_meths.append(java_meth_descr)
 349
 350                 out_java.write(");\n")
 351                 out_c.write(") {\n")
 352                 out_c.write("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
 353
 354                 for arg_info in arg_names:
 355                     if arg_info.ret_conv is not None:
 356                         out_c.write("\t" + arg_info.ret_conv[0].replace('\n', '\n\t').replace("_env", "j_calls->env"));
 357                         out_c.write(arg_info.arg_name)
 358                         out_c.write(arg_info.ret_conv[1].replace('\n', '\n\t').replace("_env", "j_calls->env") + "\n")
 359
 360                 if not ret_ty_info.passed_as_ptr:
 361                     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")
 362                 else:
 363                     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");
 364
 365                 for arg_info in arg_names:
 366                     if arg_info.ret_conv is not None:
 367                         out_c.write(", " + arg_info.ret_conv_name)
 368                     else:
 369                         out_c.write(", " + arg_info.arg_name)
 370                 out_c.write(");\n");
 371
 372                 if ret_ty_info.passed_as_ptr:
 373                     out_c.write("\t" + fn_line.group(1).strip() + " res = *ret;\n")
 374                     out_c.write("\tFREE(ret);\n")
 375                     out_c.write("\treturn res;\n")
 376                 out_c.write("}\n")
 377             elif fn_line.group(2) == "free":
 378                 out_c.write("static void " + struct_name + "_JCalls_free(void* this_arg) {\n")
 379                 out_c.write("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
 380                 out_c.write("\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n")
 381                 out_c.write("\t\t(*j_calls->env)->DeleteGlobalRef(j_calls->env, j_calls->o);\n")
 382                 out_c.write("\t\tFREE(j_calls);\n")
 383                 out_c.write("\t}\n}\n")
 384
 385         # Write out a clone function whether we need one or not, as we use them in moving to rust
 386         out_c.write("static void* " + struct_name + "_JCalls_clone(const void* this_arg) {\n")
 387         out_c.write("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
 388         out_c.write("\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n")
 389         for var_line in field_var_lines:
 390             if var_line.group(1) in trait_structs:
 391                 out_c.write("\tatomic_fetch_add_explicit(&j_calls->" + var_line.group(2) + "->refcnt, 1, memory_order_release);\n")
 392         out_c.write("\treturn (void*) this_arg;\n")
 393         out_c.write("}\n")
 394
 395         out_java.write("\t}\n")
 396
 397         out_java.write("\tpublic static native long " + struct_name + "_new(" + struct_name + " impl")
 398         out_c.write("static inline " + struct_name + " " + struct_name + "_init (JNIEnv * env, jclass _a, jobject o")
 399         for var_line in field_var_lines:
 400             if var_line.group(1) in trait_structs:
 401                 out_java.write(", " + var_line.group(1) + " " + var_line.group(2))
 402                 out_c.write(", jobject " + var_line.group(2))
 403         out_java.write(");\n")
 404         out_c.write(") {\n")
 405
 406         out_c.write("\tjclass c = (*env)->GetObjectClass(env, o);\n")
 407         out_c.write("\tassert(c != NULL);\n")
 408         out_c.write("\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n")
 409         out_c.write("\tatomic_init(&calls->refcnt, 1);\n")
 410         out_c.write("\tcalls->env = env;\n")
 411         out_c.write("\tcalls->o = (*env)->NewGlobalRef(env, o);\n")
 412         for (fn_line, java_meth_descr) in zip(trait_fn_lines, java_meths):
 413             if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
 414                 out_c.write("\tcalls->" + fn_line.group(2) + "_meth = (*env)->GetMethodID(env, c, \"" + fn_line.group(2) + "\", \"" + java_meth_descr + "\");\n")
 415                 out_c.write("\tassert(calls->" + fn_line.group(2) + "_meth != NULL);\n")
 416         out_c.write("\n\t" + struct_name + " ret = {\n")
 417         out_c.write("\t\t.this_arg = (void*) calls,\n")
 418         for fn_line in trait_fn_lines:
 419             if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
 420                 out_c.write("\t\t." + fn_line.group(2) + " = " + fn_line.group(2) + "_jcall,\n")
 421             elif fn_line.group(2) == "free":
 422                 out_c.write("\t\t.free = " + struct_name + "_JCalls_free,\n")
 423             else:
 424                 out_c.write("\t\t.clone = " + struct_name + "_JCalls_clone,\n")
 425         for var_line in field_var_lines:
 426             if var_line.group(1) in trait_structs:
 427                 out_c.write("\t\t." + var_line.group(2) + " = " + var_line.group(1) + "_init(env, _a, " + var_line.group(2) + "),\n")
 428         out_c.write("\t};\n")
 429         for var_line in field_var_lines:
 430             if var_line.group(1) in trait_structs:
 431                 out_c.write("\tcalls->" + var_line.group(2) + " = ret." + var_line.group(2) + ".this_arg;\n")
 432         out_c.write("\treturn ret;\n")
 433         out_c.write("}\n")
 434
 435         out_c.write("JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1new (JNIEnv * env, jclass _a, jobject o")
 436         for var_line in field_var_lines:
 437             if var_line.group(1) in trait_structs:
 438                 out_c.write(", jobject " + var_line.group(2))
 439         out_c.write(") {\n")
 440         out_c.write("\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n")
 441         out_c.write("\t*res_ptr = " + struct_name + "_init(env, _a, o")
 442         for var_line in field_var_lines:
 443             if var_line.group(1) in trait_structs:
 444                 out_c.write(", " + var_line.group(2))
 445         out_c.write(");\n")
 446         out_c.write("\treturn (long)res_ptr;\n")
 447         out_c.write("}\n")
 448
 449
 450
 451     out_java.write("""package org.ldk.impl;
 452
 453 public class bindings {
 454         static native void init(java.lang.Class c);
 455         static {
 456                 System.loadLibrary(\"lightningjni\");
 457                 init(java.lang.Enum.class);
 458         }
 459
 460 """)
 461     out_c.write("#include \"org_ldk_impl_bindings.h\"\n")
 462     out_c.write("#include <rust_types.h>\n")
 463     out_c.write("#include <lightning.h>\n")
 464     out_c.write("#include <assert.h>\n")
 465     out_c.write("#include <string.h>\n")
 466     out_c.write("#include <stdatomic.h>\n\n")
 467
 468     out_c.write("jmethodID ordinal_meth = NULL;\n")
 469     out_c.write("JNIEXPORT void Java_org_ldk_impl_bindings_init(JNIEnv * env, jclass _b, jclass enum_class) {\n")
 470     out_c.write("\tordinal_meth = (*env)->GetMethodID(env, enum_class, \"ordinal\", \"()I\");\n")
 471     out_c.write("\tassert(ordinal_meth != NULL);\n")
 472     out_c.write("}\n\n")
 473
 474     if sys.argv[4] == "false":
 475         out_c.write("#define MALLOC(a, _) malloc(a)\n")
 476         out_c.write("#define FREE free\n\n")
 477     else:
 478         out_c.write("#include <threads.h>\n")
 479         out_c.write("static mtx_t allocation_mtx;\n\n")
 480         out_c.write("void __attribute__((constructor)) init_mtx() {\n")
 481         out_c.write("\tassert(mtx_init(&allocation_mtx, mtx_plain) == thrd_success);\n")
 482         out_c.write("}\n\n")
 483         out_c.write("typedef struct allocation {\n")
 484         out_c.write("\tstruct allocation* next;\n")
 485         out_c.write("\tvoid* ptr;\n")
 486         out_c.write("\tconst char* struct_name;\n")
 487         out_c.write("} allocation;\n")
 488         out_c.write("static allocation* allocation_ll = NULL;\n\n")
 489         out_c.write("void* MALLOC(size_t len, const char* struct_name) {\n")
 490         out_c.write("\tvoid* res = malloc(len);\n")
 491         out_c.write("\tallocation* new_alloc = malloc(sizeof(allocation));\n")
 492         out_c.write("\tnew_alloc->ptr = res;\n")
 493         out_c.write("\tnew_alloc->struct_name = struct_name;\n")
 494         out_c.write("\tassert(mtx_lock(&allocation_mtx) == thrd_success);\n")
 495         out_c.write("\tnew_alloc->next = allocation_ll;\n")
 496         out_c.write("\tallocation_ll = new_alloc;\n")
 497         out_c.write("\tassert(mtx_unlock(&allocation_mtx) == thrd_success);\n")
 498         out_c.write("\treturn res;\n")
 499         out_c.write("}\n\n")
 500         out_c.write("void FREE(void* ptr) {\n")
 501         out_c.write("\tallocation* p = NULL;\n")
 502         out_c.write("\tassert(mtx_lock(&allocation_mtx) == thrd_success);\n")
 503         out_c.write("\tallocation* it = allocation_ll;\n")
 504         out_c.write("\twhile (it->ptr != ptr) { p = it; it = it->next; }\n")
 505         out_c.write("\tif (p) { p->next = it->next; } else { allocation_ll = it->next; }\n")
 506         out_c.write("\tassert(mtx_unlock(&allocation_mtx) == thrd_success);\n")
 507         out_c.write("\tassert(it->ptr == ptr);\n")
 508         out_c.write("\tfree(it);\n")
 509         out_c.write("\tfree(ptr);\n")
 510         out_c.write("}\n\n")
 511         out_c.write("void __attribute__((destructor)) check_leaks() {\n")
 512         out_c.write("\tfor (allocation* a = allocation_ll; a != NULL; a = a->next) { fprintf(stderr, \"%s %p remains\\n\", a->struct_name, a->ptr); }\n")
 513         out_c.write("\tassert(allocation_ll == NULL);\n")
 514         out_c.write("}\n\n")
 515
 516     # XXX: Temporarily write out a manual SecretKey_new() for testing, we should auto-gen this kind of thing
 517     out_java.write("\tpublic static native long LDKSecretKey_new();\n\n") # TODO: rm me
 518     out_c.write("JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_LDKSecretKey_1new(JNIEnv * _env, jclass _b) {\n") # TODO: rm me
 519     out_c.write("\tLDKSecretKey* key = (LDKSecretKey*)MALLOC(sizeof(LDKSecretKey), \"LDKSecretKey\");\n") # TODO: rm me
 520     out_c.write("\treturn (long)key;\n") # TODO: rm me
 521     out_c.write("}\n") # TODO: rm me
 522
 523     in_block_comment = False
 524     cur_block_obj = None
 525
 526     fn_ptr_regex = re.compile("^extern const ([A-Za-z_0-9\* ]*) \(\*(.*)\)\((.*)\);$")
 527     fn_ret_arr_regex = re.compile("(.*) \(\*(.*)\((.*)\)\)\[([0-9]*)\];$")
 528     reg_fn_regex = re.compile("([A-Za-z_0-9\* ]* \*?)([a-zA-Z_0-9]*)\((.*)\);$")
 529     const_val_regex = re.compile("^extern const ([A-Za-z_0-9]*) ([A-Za-z_0-9]*);$")
 530
 531     line_indicates_opaque_regex = re.compile("^   bool is_owned;$")
 532     line_indicates_trait_regex = re.compile("^   ([A-Za-z_0-9]* \*?)\(\*([A-Za-z_0-9]*)\)\((const )?void \*this_arg(.*)\);$")
 533     assert(line_indicates_trait_regex.match("   uintptr_t (*send_data)(void *this_arg, LDKu8slice data, bool resume_read);"))
 534     assert(line_indicates_trait_regex.match("   LDKCVec_MessageSendEventZ (*get_and_clear_pending_msg_events)(const void *this_arg);"))
 535     assert(line_indicates_trait_regex.match("   void *(*clone)(const void *this_arg);"))
 536     line_field_var_regex = re.compile("^   ([A-Za-z_0-9]*) ([A-Za-z_0-9]*);$")
 537     assert(line_field_var_regex.match("   LDKMessageSendEventsProvider MessageSendEventsProvider;"))
 538     struct_name_regex = re.compile("^typedef (struct|enum|union) (MUST_USE_STRUCT )?(LDK[A-Za-z_0-9]*) {$")
 539     assert(struct_name_regex.match("typedef struct LDKCVecTempl_u8 {"))
 540     assert(struct_name_regex.match("typedef enum LDKNetwork {"))
 541
 542     for line in in_h:
 543         if in_block_comment:
 544             #out_java.write("\t" + line)
 545             if line.endswith("*/\n"):
 546                 in_block_comment = False
 547         elif cur_block_obj is not None:
 548             cur_block_obj  = cur_block_obj + line
 549             if line.startswith("} "):
 550                 field_lines = []
 551                 struct_name = None
 552                 obj_lines = cur_block_obj.split("\n")
 553                 is_opaque = False
 554                 is_unitary_enum = False
 555                 is_union_enum = False
 556                 is_union = False
 557                 trait_fn_lines = []
 558                 field_var_lines = []
 559
 560                 for idx, struct_line in enumerate(obj_lines):
 561                     if struct_line.strip().startswith("/*"):
 562                         in_block_comment = True
 563                     if in_block_comment:
 564                         if struct_line.endswith("*/"):
 565                             in_block_comment = False
 566                     else:
 567                         struct_name_match = struct_name_regex.match(struct_line)
 568                         if struct_name_match is not None:
 569                             struct_name = struct_name_match.group(3)
 570                             if struct_name_match.group(1) == "enum":
 571                                 if not struct_name.endswith("_Tag"):
 572                                     is_unitary_enum = True
 573                                 else:
 574                                     is_union_enum = True
 575                             elif struct_name_match.group(1) == "union":
 576                                 is_union = True
 577                         if line_indicates_opaque_regex.match(struct_line):
 578                             is_opaque = True
 579                         trait_fn_match = line_indicates_trait_regex.match(struct_line)
 580                         if trait_fn_match is not None:
 581                             trait_fn_lines.append(trait_fn_match)
 582                         field_var_match = line_field_var_regex.match(struct_line)
 583                         if field_var_match is not None:
 584                             field_var_lines.append(field_var_match)
 585                         field_lines.append(struct_line)
 586
 587                 assert(struct_name is not None)
 588                 assert(len(trait_fn_lines) == 0 or not (is_opaque or is_unitary_enum or is_union_enum or is_union))
 589                 assert(not is_opaque or not (len(trait_fn_lines) != 0 or is_unitary_enum or is_union_enum or is_union))
 590                 assert(not is_unitary_enum or not (len(trait_fn_lines) != 0 or is_opaque or is_union_enum or is_union))
 591                 assert(not is_union_enum or not (len(trait_fn_lines) != 0 or is_unitary_enum or is_opaque or is_union))
 592                 assert(not is_union or not (len(trait_fn_lines) != 0 or is_unitary_enum or is_union_enum or is_opaque))
 593                 if is_opaque:
 594                     opaque_structs.add(struct_name)
 595                 elif is_unitary_enum:
 596                     unitary_enums.add(struct_name)
 597                     out_c.write("static inline " + struct_name + " " + struct_name + "_from_java(JNIEnv *env, jclass val) {\n")
 598                     out_c.write("\tswitch ((*env)->CallIntMethod(env, val, ordinal_meth)) {\n")
 599                     ord_v = 0
 600                     for idx, struct_line in enumerate(field_lines):
 601                         if idx == 0:
 602                             out_java.write("\tpublic enum " + struct_name + " {\n")
 603                         elif idx == len(field_lines) - 3:
 604                             assert(struct_line.endswith("_Sentinel,"))
 605                         elif idx == len(field_lines) - 2:
 606                             out_java.write("\t}\n")
 607                         elif idx == len(field_lines) - 1:
 608                             assert(struct_line == "")
 609                         else:
 610                             out_java.write("\t" + struct_line + "\n")
 611                             out_c.write("\t\tcase %d: return %s;\n" % (ord_v, struct_line.strip().strip(",")))
 612                             ord_v = ord_v + 1
 613                     out_c.write("\t}\n")
 614                     out_c.write("\tassert(false);\n")
 615                     out_c.write("}\n")
 616
 617                     ord_v = 0
 618                     out_c.write("static inline jclass " + struct_name + "_to_java(JNIEnv *env, " + struct_name + " val) {\n")
 619                     out_c.write("\t// TODO: This is pretty inefficient, we really need to cache the field IDs and class\n")
 620                     out_c.write("\tjclass enum_class = (*env)->FindClass(env, \"Lorg/ldk/impl/bindings$" + struct_name + ";\");\n")
 621                     out_c.write("\tassert(enum_class != NULL);\n")
 622                     out_c.write("\tswitch (val) {\n")
 623                     for idx, struct_line in enumerate(field_lines):
 624                         if idx > 0 and idx < len(field_lines) - 3:
 625                             variant = struct_line.strip().strip(",")
 626                             out_c.write("\t\tcase " + variant + ": {\n")
 627                             out_c.write("\t\t\tjfieldID field = (*env)->GetStaticFieldID(env, enum_class, \"" + variant + "\", \"Lorg/ldk/impl/bindings$" + struct_name + ";\");\n")
 628                             out_c.write("\t\t\tassert(field != NULL);\n")
 629                             out_c.write("\t\t\treturn (*env)->GetStaticObjectField(env, enum_class, field);\n")
 630                             out_c.write("\t\t}\n")
 631                             ord_v = ord_v + 1
 632                     out_c.write("\t\tdefault: assert(false);\n")
 633                     out_c.write("\t}\n")
 634                     out_c.write("}\n\n")
 635                 elif len(trait_fn_lines) > 0:
 636                     trait_structs.add(struct_name)
 637                     map_trait(struct_name, field_var_lines, trait_fn_lines)
 638                 cur_block_obj = None
 639         else:
 640             fn_ptr = fn_ptr_regex.match(line)
 641             fn_ret_arr = fn_ret_arr_regex.match(line)
 642             reg_fn = reg_fn_regex.match(line)
 643             const_val = const_val_regex.match(line)
 644
 645             if line.startswith("#include <"):
 646                 pass
 647             elif line.startswith("/*"):
 648                 #out_java.write("\t" + line)
 649                 if not line.endswith("*/\n"):
 650                     in_block_comment = True
 651             elif line.startswith("typedef enum "):
 652                 cur_block_obj = line
 653             elif line.startswith("typedef struct "):
 654                 cur_block_obj = line
 655             elif line.startswith("typedef union "):
 656                 cur_block_obj = line
 657             elif line.startswith("typedef "):
 658                 pass
 659             elif fn_ptr is not None:
 660                 map_fn(fn_ptr, None)
 661             elif fn_ret_arr is not None:
 662                 map_fn(fn_ret_arr, fn_ret_arr.group(4))
 663             elif reg_fn is not None:
 664                 map_fn(reg_fn, None)
 665             elif const_val_regex is not None:
 666                 # TODO Map const variables
 667                 pass
 668             else:
 669                 assert(line == "\n")
 670
 671     out_java.write("}\n")