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

   1 #!/usr/bin/env python3
   2 import sys, re
   3
   4 if len(sys.argv) != 6:
   5     print("USAGE: /path/to/lightning.h /path/to/bindings/output.java /path/to/bindings/enums/ /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[4], "w") as out_c:
  47     opaque_structs = set()
  48     trait_structs = set()
  49     unitary_enums = set()
  50
  51     def camel_to_snake(s):
  52         # Convert camel case to snake case, in a way that appears to match cbindgen
  53         con = "_"
  54         ret = ""
  55         lastchar = ""
  56         lastund = False
  57         for char in s:
  58             if lastchar.isupper():
  59                 if not char.isupper() and not lastund:
  60                     ret = ret + "_"
  61                     lastund = True
  62                 else:
  63                     lastund = False
  64                 ret = ret + lastchar.lower()
  65             else:
  66                 ret = ret + lastchar
  67                 if char.isupper() and not lastund:
  68                     ret = ret + "_"
  69                     lastund = True
  70                 else:
  71                     lastund = False
  72             lastchar = char
  73             if char.isnumeric():
  74                 lastund = True
  75         return (ret + lastchar.lower()).strip("_")
  76
  77     var_is_arr_regex = re.compile("\(\*([A-za-z0-9_]*)\)\[([0-9]*)\]")
  78     var_ty_regex = re.compile("([A-za-z_0-9]*)(.*)")
  79     def java_c_types(fn_arg, ret_arr_len):
  80         fn_arg = fn_arg.strip()
  81         if fn_arg.startswith("MUST_USE_RES "):
  82             fn_arg = fn_arg[13:]
  83         is_const = False
  84         if fn_arg.startswith("const "):
  85             fn_arg = fn_arg[6:]
  86             is_const = True
  87
  88         is_ptr = False
  89         take_by_ptr = False
  90         rust_obj = None
  91         if fn_arg.startswith("LDKThirtyTwoBytes"):
  92             fn_arg = "uint8_t (*" + fn_arg[18:] + ")[32]"
  93             assert var_is_arr_regex.match(fn_arg[8:])
  94             rust_obj = "LDKThirtyTwoBytes"
  95
  96         if fn_arg.startswith("void"):
  97             java_ty = "void"
  98             c_ty = "void"
  99             fn_ty_arg = "V"
 100             fn_arg = fn_arg[4:].strip()
 101         elif fn_arg.startswith("bool"):
 102             java_ty = "boolean"
 103             c_ty = "jboolean"
 104             fn_ty_arg = "Z"
 105             fn_arg = fn_arg[4:].strip()
 106         elif fn_arg.startswith("uint8_t"):
 107             java_ty = "byte"
 108             c_ty = "jbyte"
 109             fn_ty_arg = "B"
 110             fn_arg = fn_arg[7:].strip()
 111         elif fn_arg.startswith("uint16_t"):
 112             java_ty = "short"
 113             c_ty = "jshort"
 114             fn_ty_arg = "S"
 115             fn_arg = fn_arg[8:].strip()
 116         elif fn_arg.startswith("uint32_t"):
 117             java_ty = "int"
 118             c_ty = "jint"
 119             fn_ty_arg = "I"
 120             fn_arg = fn_arg[8:].strip()
 121         elif fn_arg.startswith("uint64_t") or fn_arg.startswith("uintptr_t"):
 122             java_ty = "long"
 123             c_ty = "jlong"
 124             fn_ty_arg = "J"
 125             if fn_arg.startswith("uint64_t"):
 126                 fn_arg = fn_arg[8:].strip()
 127             else:
 128                 fn_arg = fn_arg[9:].strip()
 129         elif is_const and fn_arg.startswith("char *"):
 130             java_ty = "String"
 131             c_ty = "const char*"
 132             fn_ty_arg = "Ljava/lang/String;"
 133             fn_arg = fn_arg[6:].strip()
 134         else:
 135             ma = var_ty_regex.match(fn_arg)
 136             if ma.group(1).strip() in unitary_enums:
 137                 java_ty = ma.group(1).strip()
 138                 c_ty = "jclass"
 139                 fn_ty_arg = "Lorg/ldk/enums/" + ma.group(1).strip() + ";"
 140                 fn_arg = ma.group(2).strip()
 141                 rust_obj = ma.group(1).strip()
 142                 take_by_ptr = True
 143             else:
 144                 java_ty = "long"
 145                 c_ty = "jlong"
 146                 fn_ty_arg = "J"
 147                 fn_arg = ma.group(2).strip()
 148                 rust_obj = ma.group(1).strip()
 149                 take_by_ptr = True
 150
 151         if fn_arg.startswith(" *") or fn_arg.startswith("*"):
 152             fn_arg = fn_arg.replace("*", "").strip()
 153             is_ptr = True
 154             c_ty = "jlong"
 155             java_ty = "long"
 156             fn_ty_arg = "J"
 157
 158         var_is_arr = var_is_arr_regex.match(fn_arg)
 159         if var_is_arr is not None or ret_arr_len is not None:
 160             assert(not take_by_ptr)
 161             assert(not is_ptr)
 162             java_ty = java_ty + "[]"
 163             c_ty = c_ty + "Array"
 164             if var_is_arr is not None:
 165                 return TypeInfo(rust_obj=rust_obj, java_ty=java_ty, java_fn_ty_arg="[" + fn_ty_arg, c_ty=c_ty,
 166                     passed_as_ptr=False, is_ptr=False, var_name=var_is_arr.group(1), arr_len=var_is_arr.group(2))
 167         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,
 168             is_ptr=is_ptr, var_name=fn_arg, arr_len=None)
 169
 170     def map_type(fn_arg, print_void, ret_arr_len, is_free):
 171         ty_info = java_c_types(fn_arg, ret_arr_len)
 172
 173         if ty_info.c_ty == "void":
 174             if not print_void:
 175                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 176                     arg_conv = None, arg_conv_name = None, ret_conv = None, ret_conv_name = None)
 177
 178         if ty_info.c_ty.endswith("Array"):
 179             arr_len = ty_info.arr_len
 180             if arr_len is not None:
 181                 arr_name = ty_info.var_name
 182             else:
 183                 arr_name = "ret"
 184                 arr_len = ret_arr_len
 185             assert(ty_info.c_ty == "jbyteArray")
 186             if ty_info.rust_obj is not None:
 187                 arg_conv = ty_info.rust_obj + " " + arr_name + "_ref;\n" + "(*_env)->GetByteArrayRegion (_env, " + arr_name + ", 0, " + arr_len + ", " + arr_name + "_ref.data);"
 188                 arr_access = ("", ".data")
 189             else:
 190                 arg_conv = "unsigned char " + arr_name + "_arr[" + arr_len + "];\n" + "(*_env)->GetByteArrayRegion (_env, " + arr_name + ", 0, " + arr_len + ", " + arr_name + "_arr);\n" + "unsigned char (*" + arr_name + "_ref)[" + arr_len + "] = &" + arr_name + "_arr;"
 191                 arr_access = ("*", "")
 192             return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 193                 arg_conv = arg_conv,
 194                 arg_conv_name = arr_name + "_ref",
 195                 ret_conv = ("jbyteArray " + arr_name + "_arr = (*_env)->NewByteArray(_env, " + arr_len + ");\n" +
 196                     "(*_env)->SetByteArrayRegion(_env, " + arr_name + "_arr, 0, " + arr_len + ", " + arr_access[0],
 197                     arr_access[1] + ");"),
 198                 ret_conv_name = arr_name + "_arr")
 199         elif ty_info.var_name != "":
 200             # If we have a parameter name, print it (noting that it may indicate its a pointer)
 201             if ty_info.rust_obj is not None:
 202                 assert(ty_info.passed_as_ptr)
 203                 opaque_arg_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv;\n"
 204                 opaque_arg_conv = opaque_arg_conv + ty_info.var_name + "_conv.inner = (void*)(" + ty_info.var_name + " & (~1));\n"
 205                 opaque_arg_conv = opaque_arg_conv + ty_info.var_name + "_conv.is_owned = (" + ty_info.var_name + " & 1) || (" + ty_info.var_name + " == 0);"
 206                 if not ty_info.is_ptr:
 207                     if ty_info.rust_obj in unitary_enums:
 208                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 209                             arg_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv = " + ty_info.rust_obj + "_from_java(_env, " + ty_info.var_name + ");",
 210                             arg_conv_name = ty_info.var_name + "_conv",
 211                             ret_conv = ("jclass " + ty_info.var_name + "_conv = " + ty_info.rust_obj + "_to_java(_env, ", ");"),
 212                             ret_conv_name = ty_info.var_name + "_conv")
 213                     if ty_info.rust_obj in opaque_structs:
 214                         ret_conv_suf = ";\nDO_ASSERT((((long)" + ty_info.var_name + "_var.inner) & 1) == 0); // We rely on a free low bit, malloc guarantees this.\n"
 215                         ret_conv_suf = ret_conv_suf + "DO_ASSERT((((long)&" + ty_info.var_name + "_var) & 1) == 0); // We rely on a free low bit, pointer alignment guarantees this.\n"
 216                         ret_conv_suf = ret_conv_suf + "long " + ty_info.var_name + "_ref;\n"
 217                         ret_conv_suf = ret_conv_suf + "if (" + ty_info.var_name + "_var.is_owned) {\n"
 218                         ret_conv_suf = ret_conv_suf + "\t" + ty_info.var_name + "_ref = (long)" + ty_info.var_name + "_var.inner | 1;\n"
 219                         ret_conv_suf = ret_conv_suf + "} else {\n"
 220                         ret_conv_suf = ret_conv_suf + "\t" + ty_info.var_name + "_ref = (long)&" + ty_info.var_name + "_var;\n"
 221                         ret_conv_suf = ret_conv_suf + "}"
 222                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 223                             arg_conv = opaque_arg_conv, arg_conv_name = ty_info.var_name + "_conv",
 224                             ret_conv = (ty_info.rust_obj + " " + ty_info.var_name + "_var = ", ret_conv_suf),
 225                             ret_conv_name = ty_info.var_name + "_ref")
 226                     base_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv = *(" + ty_info.rust_obj + "*)" + ty_info.var_name + ";";
 227                     if ty_info.rust_obj in trait_structs:
 228                         if not is_free:
 229                             base_conv = base_conv + "\nif (" + ty_info.var_name + "_conv.free == " + ty_info.rust_obj + "_JCalls_free) {\n"
 230                             base_conv = base_conv + "\t// If this_arg is a JCalls struct, then we need to increment the refcnt in it.\n"
 231                             base_conv = base_conv + "\t" + ty_info.rust_obj + "_JCalls_clone(" + ty_info.var_name + "_conv.this_arg);\n}"
 232                         else:
 233                             base_conv = base_conv + "\n" + "FREE((void*)" + ty_info.var_name + ");"
 234                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 235                             arg_conv = base_conv,
 236                             arg_conv_name = ty_info.var_name + "_conv",
 237                             ret_conv = ("CANT PASS TRAIT TO Java?", ""), ret_conv_name = "NO CONV POSSIBLE")
 238                     if ty_info.rust_obj != "LDKu8slice":
 239                         # Don't bother free'ing slices passed in - Rust doesn't auto-free the
 240                         # underlying unlike Vecs, and it gives Java more freedom.
 241                         base_conv = base_conv + "\nFREE((void*)" + ty_info.var_name + ");";
 242                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 243                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv",
 244                         ret_conv = ("long " + ty_info.var_name + "_ref = (long)&", ";"), ret_conv_name = ty_info.var_name + "_ref")
 245                 else:
 246                     assert(not is_free)
 247                     if ty_info.rust_obj in opaque_structs:
 248                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 249                             arg_conv = opaque_arg_conv, arg_conv_name = "&" + ty_info.var_name + "_conv",
 250                             ret_conv = None, ret_conv_name = None) # its a pointer, no conv needed
 251                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 252                         arg_conv = ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)" + ty_info.var_name + ";",
 253                         arg_conv_name = ty_info.var_name + "_conv",
 254                         ret_conv = None, ret_conv_name = None) # its a pointer, no conv needed
 255             elif ty_info.is_ptr:
 256                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 257                     arg_conv = None, arg_conv_name = ty_info.var_name, ret_conv = None, ret_conv_name = None)
 258             elif ty_info.java_ty == "String":
 259                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 260                     arg_conv = None, arg_conv_name = None,
 261                     ret_conv = ("jstring " + ty_info.var_name + "_conv = (*_env)->NewStringUTF(_env, ", ");"), ret_conv_name = ty_info.var_name + "_conv")
 262             else:
 263                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 264                     arg_conv = None, arg_conv_name = ty_info.var_name, ret_conv = None, ret_conv_name = None)
 265         elif not print_void:
 266             # We don't have a parameter name, and want one, just call it arg
 267             if ty_info.rust_obj is not None:
 268                 assert(not is_free or ty_info.rust_obj not in opaque_structs);
 269                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 270                     arg_conv = ty_info.rust_obj + " arg_conv = *(" + ty_info.rust_obj + "*)arg;\nFREE((void*)arg);",
 271                     arg_conv_name = "arg_conv",
 272                     ret_conv = None, ret_conv_name = None)
 273             else:
 274                 assert(not is_free)
 275                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 276                     arg_conv = None, arg_conv_name = "arg", ret_conv = None, ret_conv_name = None)
 277         else:
 278             # We don't have a parameter name, and don't want one (cause we're returning)
 279             if ty_info.rust_obj is not None:
 280                 if not ty_info.is_ptr:
 281                     if ty_info.rust_obj in unitary_enums:
 282                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 283                             arg_conv = ty_info.rust_obj + " ret = " + ty_info.rust_obj + "_from_java(_env, " + ty_info.var_name + ");",
 284                             arg_conv_name = "ret",
 285                             ret_conv = ("jclass ret = " + ty_info.rust_obj + "_to_java(_env, ", ");"), ret_conv_name = "ret")
 286                     if ty_info.rust_obj in opaque_structs:
 287                         # If we're returning a newly-allocated struct, we don't want Rust to ever
 288                         # free, instead relying on the Java GC to lose the ref. We undo this in
 289                         # any _free function.
 290                         # To avoid any issues, we first assert that the incoming object is non-ref.
 291                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 292                             ret_conv = (ty_info.rust_obj + " ret = ", ";\nDO_ASSERT(ret.is_owned);"),
 293                             ret_conv_name = "((long)ret.inner) | 1",
 294                             arg_conv = None, arg_conv_name = None)
 295                     else:
 296                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 297                             ret_conv = (ty_info.rust_obj + "* ret = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n*ret = ", ";"),
 298                             ret_conv_name = "(long)ret",
 299                             arg_conv = None, arg_conv_name = None)
 300                 else:
 301                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 302                         ret_conv = ("long ret = (long)", ";"), ret_conv_name = "ret",
 303                         arg_conv = None, arg_conv_name = None)
 304             else:
 305                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 306                     arg_conv = None, arg_conv_name = None, ret_conv = None, ret_conv_name = None)
 307
 308     def map_fn(line, re_match, ret_arr_len, c_call_string):
 309         out_java.write("\t// " + line)
 310         out_java.write("\tpublic static native ")
 311         out_c.write("JNIEXPORT ")
 312
 313         ret_info = map_type(re_match.group(1), True, ret_arr_len, False)
 314         ret_info.print_ty()
 315         if ret_info.ret_conv is not None:
 316             ret_conv_pfx, ret_conv_sfx = ret_info.ret_conv
 317
 318         out_java.write(" " + re_match.group(2) + "(")
 319         out_c.write(" JNICALL Java_org_ldk_impl_bindings_" + re_match.group(2).replace('_', '_1') + "(JNIEnv * _env, jclass _b")
 320
 321         arg_names = []
 322         for idx, arg in enumerate(re_match.group(3).split(',')):
 323             if idx != 0:
 324                 out_java.write(", ")
 325             if arg != "void":
 326                 out_c.write(", ")
 327             arg_conv_info = map_type(arg, False, None, re_match.group(2).endswith("_free"))
 328             if arg_conv_info.c_ty != "void":
 329                 arg_conv_info.print_ty()
 330                 arg_conv_info.print_name()
 331             arg_names.append(arg_conv_info)
 332
 333         out_java.write(");\n")
 334         out_c.write(") {\n")
 335
 336         for info in arg_names:
 337             if info.arg_conv is not None:
 338                 out_c.write("\t" + info.arg_conv.replace('\n', "\n\t") + "\n");
 339
 340         if ret_info.ret_conv is not None:
 341             out_c.write("\t" + ret_conv_pfx.replace('\n', '\n\t'));
 342         else:
 343             out_c.write("\treturn ");
 344
 345         if c_call_string is None:
 346             out_c.write(re_match.group(2) + "(")
 347         else:
 348             out_c.write(c_call_string)
 349         for idx, info in enumerate(arg_names):
 350             if info.arg_conv_name is not None:
 351                 if idx != 0:
 352                     out_c.write(", ")
 353                 elif c_call_string is not None:
 354                     continue
 355                 out_c.write(info.arg_conv_name)
 356         out_c.write(")")
 357         if ret_info.ret_conv is not None:
 358             out_c.write(ret_conv_sfx.replace('\n', '\n\t'))
 359             out_c.write("\n\treturn " + ret_info.ret_conv_name + ";")
 360         else:
 361             out_c.write(";")
 362         out_c.write("\n}\n\n")
 363
 364     def map_unitary_enum(struct_name, field_lines):
 365         with open(sys.argv[3] + "/" + struct_name + ".java", "w") as out_java_enum:
 366             out_java_enum.write("package org.ldk.enums;\n\n")
 367             unitary_enums.add(struct_name)
 368             out_c.write("static inline " + struct_name + " " + struct_name + "_from_java(JNIEnv *env, jclass val) {\n")
 369             out_c.write("\tswitch ((*env)->CallIntMethod(env, val, ordinal_meth)) {\n")
 370             ord_v = 0
 371             for idx, struct_line in enumerate(field_lines):
 372                 if idx == 0:
 373                     out_java_enum.write("public enum " + struct_name + " {\n")
 374                 elif idx == len(field_lines) - 3:
 375                     assert(struct_line.endswith("_Sentinel,"))
 376                 elif idx == len(field_lines) - 2:
 377                     out_java_enum.write("\t; static native void init();\n")
 378                     out_java_enum.write("\tstatic { init(); }\n")
 379                     out_java_enum.write("}")
 380                     out_java.write("\tstatic { " + struct_name + ".values(); /* Force enum statics to run */ }\n")
 381                 elif idx == len(field_lines) - 1:
 382                     assert(struct_line == "")
 383                 else:
 384                     out_java_enum.write(struct_line + "\n")
 385                     out_c.write("\t\tcase %d: return %s;\n" % (ord_v, struct_line.strip().strip(",")))
 386                     ord_v = ord_v + 1
 387             out_c.write("\t}\n")
 388             out_c.write("\tabort();\n")
 389             out_c.write("}\n")
 390
 391             ord_v = 0
 392             out_c.write("static jclass " + struct_name + "_class = NULL;\n")
 393             for idx, struct_line in enumerate(field_lines):
 394                 if idx > 0 and idx < len(field_lines) - 3:
 395                     variant = struct_line.strip().strip(",")
 396                     out_c.write("static jfieldID " + struct_name + "_" + variant + " = NULL;\n")
 397             out_c.write("JNIEXPORT void JNICALL Java_org_ldk_enums_" + struct_name.replace("_", "_1") + "_init (JNIEnv * env, jclass clz) {\n")
 398             out_c.write("\t" + struct_name + "_class = (*env)->NewGlobalRef(env, clz);\n")
 399             out_c.write("\tDO_ASSERT(" + struct_name + "_class != NULL);\n")
 400             for idx, struct_line in enumerate(field_lines):
 401                 if idx > 0 and idx < len(field_lines) - 3:
 402                     variant = struct_line.strip().strip(",")
 403                     out_c.write("\t" + struct_name + "_" + variant + " = (*env)->GetStaticFieldID(env, " + struct_name + "_class, \"" + variant + "\", \"Lorg/ldk/enums/" + struct_name + ";\");\n")
 404                     out_c.write("\tDO_ASSERT(" + struct_name + "_" + variant + " != NULL);\n")
 405             out_c.write("}\n")
 406             out_c.write("static inline jclass " + struct_name + "_to_java(JNIEnv *env, " + struct_name + " val) {\n")
 407             out_c.write("\tswitch (val) {\n")
 408             for idx, struct_line in enumerate(field_lines):
 409                 if idx > 0 and idx < len(field_lines) - 3:
 410                     variant = struct_line.strip().strip(",")
 411                     out_c.write("\t\tcase " + variant + ":\n")
 412                     out_c.write("\t\t\treturn (*env)->GetStaticObjectField(env, " + struct_name + "_class, " + struct_name + "_" + variant + ");\n")
 413                     ord_v = ord_v + 1
 414             out_c.write("\t\tdefault: abort();\n")
 415             out_c.write("\t}\n")
 416             out_c.write("}\n\n")
 417
 418     def map_complex_enum(struct_name, union_enum_items):
 419         tag_field_lines = union_enum_items["field_lines"]
 420         init_meth_jty_strs = {}
 421         for idx, struct_line in enumerate(tag_field_lines):
 422             if idx == 0:
 423                 out_java.write("\tpublic static class " + struct_name + " {\n")
 424                 out_java.write("\t\tprivate " + struct_name + "() {}\n")
 425             elif idx == len(tag_field_lines) - 3:
 426                 assert(struct_line.endswith("_Sentinel,"))
 427             elif idx == len(tag_field_lines) - 2:
 428                 out_java.write("\t\tstatic native void init();\n")
 429                 out_java.write("\t}\n")
 430             elif idx == len(tag_field_lines) - 1:
 431                 assert(struct_line == "")
 432             else:
 433                 var_name = struct_line.strip(' ,')[len(struct_name) + 1:]
 434                 out_java.write("\t\tpublic final static class " + var_name + " extends " + struct_name + " {\n")
 435                 out_c.write("static jclass " + struct_name + "_" + var_name + "_class = NULL;\n")
 436                 out_c.write("static jmethodID " + struct_name + "_" + var_name + "_meth = NULL;\n")
 437                 init_meth_jty_str = ""
 438                 init_meth_params = ""
 439                 init_meth_body = ""
 440                 if "LDK" + var_name in union_enum_items:
 441                     enum_var_lines = union_enum_items["LDK" + var_name]
 442                     for idx, field in enumerate(enum_var_lines):
 443                         if idx != 0 and idx < len(enum_var_lines) - 2:
 444                             field_ty = java_c_types(field.strip(' ;'), None)
 445                             out_java.write("\t\t\tpublic " + field_ty.java_ty + " " + field_ty.var_name + ";\n")
 446                             init_meth_jty_str = init_meth_jty_str + field_ty.java_fn_ty_arg
 447                             if idx > 1:
 448                                 init_meth_params = init_meth_params + ", "
 449                             init_meth_params = init_meth_params + field_ty.java_ty + " " + field_ty.var_name
 450                             init_meth_body = init_meth_body + "this." + field_ty.var_name + " = " + field_ty.var_name + "; "
 451                     out_java.write("\t\t\t" + var_name + "(" + init_meth_params + ") { ")
 452                     out_java.write(init_meth_body)
 453                     out_java.write("}\n")
 454                 out_java.write("\t\t}\n")
 455                 init_meth_jty_strs[var_name] = init_meth_jty_str
 456         out_java.write("\tstatic { " + struct_name + ".init(); }\n")
 457         out_java.write("\tpublic static native " + struct_name + " " + struct_name + "_ref_from_ptr(long ptr);\n");
 458
 459         out_c.write("JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_00024" + struct_name.replace("_", "_1") + "_init (JNIEnv * env, jclass _a) {\n")
 460         for idx, struct_line in enumerate(tag_field_lines):
 461             if idx != 0 and idx < len(tag_field_lines) - 3:
 462                 var_name = struct_line.strip(' ,')[len(struct_name) + 1:]
 463                 out_c.write("\t" + struct_name + "_" + var_name + "_class =\n")
 464                 out_c.write("\t\t(*env)->NewGlobalRef(env, (*env)->FindClass(env, \"Lorg/ldk/impl/bindings$" + struct_name + "$" + var_name + ";\"));\n")
 465                 out_c.write("\tDO_ASSERT(" + struct_name + "_" + var_name + "_class != NULL);\n")
 466                 out_c.write("\t" + struct_name + "_" + var_name + "_meth = (*env)->GetMethodID(env, " + struct_name + "_" + var_name + "_class, \"<init>\", \"(" + init_meth_jty_strs[var_name] + ")V\");\n")
 467                 out_c.write("\tDO_ASSERT(" + struct_name + "_" + var_name + "_meth != NULL);\n")
 468         out_c.write("}\n")
 469         out_c.write("JNIEXPORT jobject JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1ref_1from_1ptr (JNIEnv * env, jclass _c, jlong ptr) {\n")
 470         out_c.write("\t" + struct_name + " *obj = (" + struct_name + "*)ptr;\n")
 471         out_c.write("\tswitch(obj->tag) {\n")
 472         for idx, struct_line in enumerate(tag_field_lines):
 473             if idx != 0 and idx < len(tag_field_lines) - 3:
 474                 var_name = struct_line.strip(' ,')[len(struct_name) + 1:]
 475                 out_c.write("\t\tcase " + struct_name + "_" + var_name + ": {\n")
 476                 c_params_text = ""
 477                 if "LDK" + var_name in union_enum_items:
 478                     enum_var_lines = union_enum_items["LDK" + var_name]
 479                     for idx, field in enumerate(enum_var_lines):
 480                         if idx != 0 and idx < len(enum_var_lines) - 2:
 481                             field_map = map_type(field.strip(' ;'), False, None, False)
 482                             if field_map.ret_conv is not None:
 483                                 out_c.write("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t").replace("_env", "env"))
 484                                 out_c.write("obj->" + camel_to_snake(var_name) + "." + field_map.arg_name)
 485                                 out_c.write(field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
 486                                 c_params_text = c_params_text + ", " + field_map.ret_conv_name
 487                             else:
 488                                 c_params_text = c_params_text + ", obj->" + camel_to_snake(var_name) + "." + field_map.arg_name
 489                 out_c.write("\t\t\treturn (*env)->NewObject(env, " + struct_name + "_" + var_name + "_class, " + struct_name + "_" + var_name + "_meth" + c_params_text + ");\n")
 490                 out_c.write("\t\t}\n")
 491         out_c.write("\t\tdefault: abort();\n")
 492         out_c.write("\t}\n}\n")
 493
 494     def map_trait(struct_name, field_var_lines, trait_fn_lines):
 495         out_c.write("typedef struct " + struct_name + "_JCalls {\n")
 496         out_c.write("\tatomic_size_t refcnt;\n")
 497         out_c.write("\tJavaVM *vm;\n")
 498         out_c.write("\tjobject o;\n")
 499         for var_line in field_var_lines:
 500             if var_line.group(1) in trait_structs:
 501                 out_c.write("\t" + var_line.group(1) + "_JCalls* " + var_line.group(2) + ";\n")
 502         for fn_line in trait_fn_lines:
 503             if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
 504                 out_c.write("\tjmethodID " + fn_line.group(2) + "_meth;\n")
 505         out_c.write("} " + struct_name + "_JCalls;\n")
 506
 507         out_java.write("\tpublic interface " + struct_name + " {\n")
 508         java_meths = []
 509         for fn_line in trait_fn_lines:
 510             java_meth_descr = "("
 511             if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
 512                 ret_ty_info = java_c_types(fn_line.group(1), None)
 513
 514                 out_java.write("\t\t " + ret_ty_info.java_ty + " " + fn_line.group(2) + "(")
 515                 is_const = fn_line.group(3) is not None
 516                 out_c.write(fn_line.group(1) + fn_line.group(2) + "_jcall(")
 517                 if is_const:
 518                     out_c.write("const void* this_arg")
 519                 else:
 520                     out_c.write("void* this_arg")
 521
 522                 arg_names = []
 523                 for idx, arg in enumerate(fn_line.group(4).split(',')):
 524                     if arg == "":
 525                         continue
 526                     if idx >= 2:
 527                         out_java.write(", ")
 528                     out_c.write(", ")
 529                     arg_conv_info = map_type(arg, True, None, False)
 530                     out_c.write(arg.strip())
 531                     out_java.write(arg_conv_info.java_ty + " " + arg_conv_info.arg_name)
 532                     arg_names.append(arg_conv_info)
 533                     java_meth_descr = java_meth_descr + arg_conv_info.java_fn_ty_arg
 534                 java_meth_descr = java_meth_descr + ")" + ret_ty_info.java_fn_ty_arg
 535                 java_meths.append(java_meth_descr)
 536
 537                 out_java.write(");\n")
 538                 out_c.write(") {\n")
 539                 out_c.write("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
 540                 out_c.write("\tJNIEnv *env;\n")
 541                 out_c.write("\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_8) == JNI_OK);\n")
 542
 543                 for arg_info in arg_names:
 544                     if arg_info.ret_conv is not None:
 545                         out_c.write("\t" + arg_info.ret_conv[0].replace('\n', '\n\t').replace("_env", "env"));
 546                         out_c.write(arg_info.arg_name)
 547                         out_c.write(arg_info.ret_conv[1].replace('\n', '\n\t').replace("_env", "env") + "\n")
 548
 549                 if ret_ty_info.c_ty.endswith("Array"):
 550                     assert(ret_ty_info.c_ty == "jbyteArray")
 551                     out_c.write("\tjbyteArray jret = (*env)->CallObjectMethod(env, j_calls->o, j_calls->" + fn_line.group(2) + "_meth")
 552                 elif not ret_ty_info.passed_as_ptr:
 553                     out_c.write("\treturn (*env)->Call" + ret_ty_info.java_ty.title() + "Method(env, j_calls->o, j_calls->" + fn_line.group(2) + "_meth")
 554                 else:
 555                     out_c.write("\t" + fn_line.group(1).strip() + "* ret = (" + fn_line.group(1).strip() + "*)(*env)->CallLongMethod(env, j_calls->o, j_calls->" + fn_line.group(2) + "_meth");
 556
 557                 for arg_info in arg_names:
 558                     if arg_info.ret_conv is not None:
 559                         out_c.write(", " + arg_info.ret_conv_name)
 560                     else:
 561                         out_c.write(", " + arg_info.arg_name)
 562                 out_c.write(");\n");
 563                 if ret_ty_info.c_ty.endswith("Array"):
 564                     out_c.write("\t" + ret_ty_info.rust_obj + " ret;\n")
 565                     out_c.write("\t(*env)->GetByteArrayRegion(env, jret, 0, " + ret_ty_info.arr_len + ", ret.data);\n")
 566                     out_c.write("\treturn ret;\n")
 567
 568                 if ret_ty_info.passed_as_ptr:
 569                     out_c.write("\t" + fn_line.group(1).strip() + " res = *ret;\n")
 570                     out_c.write("\tFREE(ret);\n")
 571                     out_c.write("\treturn res;\n")
 572                 out_c.write("}\n")
 573             elif fn_line.group(2) == "free":
 574                 out_c.write("static void " + struct_name + "_JCalls_free(void* this_arg) {\n")
 575                 out_c.write("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
 576                 out_c.write("\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n")
 577                 out_c.write("\t\tJNIEnv *env;\n")
 578                 out_c.write("\t\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_8) == JNI_OK);\n")
 579                 out_c.write("\t\t(*env)->DeleteGlobalRef(env, j_calls->o);\n")
 580                 out_c.write("\t\tFREE(j_calls);\n")
 581                 out_c.write("\t}\n}\n")
 582
 583         # Write out a clone function whether we need one or not, as we use them in moving to rust
 584         out_c.write("static void* " + struct_name + "_JCalls_clone(const void* this_arg) {\n")
 585         out_c.write("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
 586         out_c.write("\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n")
 587         for var_line in field_var_lines:
 588             if var_line.group(1) in trait_structs:
 589                 out_c.write("\tatomic_fetch_add_explicit(&j_calls->" + var_line.group(2) + "->refcnt, 1, memory_order_release);\n")
 590         out_c.write("\treturn (void*) this_arg;\n")
 591         out_c.write("}\n")
 592
 593         out_java.write("\t}\n")
 594
 595         out_java.write("\tpublic static native long " + struct_name + "_new(" + struct_name + " impl")
 596         out_c.write("static inline " + struct_name + " " + struct_name + "_init (JNIEnv * env, jclass _a, jobject o")
 597         for var_line in field_var_lines:
 598             if var_line.group(1) in trait_structs:
 599                 out_java.write(", " + var_line.group(1) + " " + var_line.group(2))
 600                 out_c.write(", jobject " + var_line.group(2))
 601         out_java.write(");\n")
 602         out_c.write(") {\n")
 603
 604         out_c.write("\tjclass c = (*env)->GetObjectClass(env, o);\n")
 605         out_c.write("\tDO_ASSERT(c != NULL);\n")
 606         out_c.write("\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n")
 607         out_c.write("\tatomic_init(&calls->refcnt, 1);\n")
 608         out_c.write("\tDO_ASSERT((*env)->GetJavaVM(env, &calls->vm) == 0);\n")
 609         out_c.write("\tcalls->o = (*env)->NewGlobalRef(env, o);\n")
 610         for (fn_line, java_meth_descr) in zip(trait_fn_lines, java_meths):
 611             if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
 612                 out_c.write("\tcalls->" + fn_line.group(2) + "_meth = (*env)->GetMethodID(env, c, \"" + fn_line.group(2) + "\", \"" + java_meth_descr + "\");\n")
 613                 out_c.write("\tDO_ASSERT(calls->" + fn_line.group(2) + "_meth != NULL);\n")
 614         out_c.write("\n\t" + struct_name + " ret = {\n")
 615         out_c.write("\t\t.this_arg = (void*) calls,\n")
 616         for fn_line in trait_fn_lines:
 617             if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
 618                 out_c.write("\t\t." + fn_line.group(2) + " = " + fn_line.group(2) + "_jcall,\n")
 619             elif fn_line.group(2) == "free":
 620                 out_c.write("\t\t.free = " + struct_name + "_JCalls_free,\n")
 621             else:
 622                 out_c.write("\t\t.clone = " + struct_name + "_JCalls_clone,\n")
 623         for var_line in field_var_lines:
 624             if var_line.group(1) in trait_structs:
 625                 out_c.write("\t\t." + var_line.group(2) + " = " + var_line.group(1) + "_init(env, _a, " + var_line.group(2) + "),\n")
 626         out_c.write("\t};\n")
 627         for var_line in field_var_lines:
 628             if var_line.group(1) in trait_structs:
 629                 out_c.write("\tcalls->" + var_line.group(2) + " = ret." + var_line.group(2) + ".this_arg;\n")
 630         out_c.write("\treturn ret;\n")
 631         out_c.write("}\n")
 632
 633         out_c.write("JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1new (JNIEnv * env, jclass _a, jobject o")
 634         for var_line in field_var_lines:
 635             if var_line.group(1) in trait_structs:
 636                 out_c.write(", jobject " + var_line.group(2))
 637         out_c.write(") {\n")
 638         out_c.write("\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n")
 639         out_c.write("\t*res_ptr = " + struct_name + "_init(env, _a, o")
 640         for var_line in field_var_lines:
 641             if var_line.group(1) in trait_structs:
 642                 out_c.write(", " + var_line.group(2))
 643         out_c.write(");\n")
 644         out_c.write("\treturn (long)res_ptr;\n")
 645         out_c.write("}\n")
 646
 647         out_java.write("\tpublic static native " + struct_name + " " + struct_name + "_get_obj_from_jcalls(long val);\n")
 648         out_c.write("JNIEXPORT jobject JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1get_1obj_1from_1jcalls (JNIEnv * env, jclass _a, jlong val) {\n")
 649         out_c.write("\treturn ((" + struct_name + "_JCalls*)val)->o;\n")
 650         out_c.write("}\n")
 651
 652         for fn_line in trait_fn_lines:
 653             # For now, just disable enabling the _call_log - we don't know how to inverse-map String
 654             is_log = fn_line.group(2) == "log" and struct_name == "LDKLogger"
 655             if fn_line.group(2) != "free" and fn_line.group(2) != "clone" and fn_line.group(2) != "eq" and not is_log:
 656                 dummy_line = fn_line.group(1) + struct_name + "_call_" + fn_line.group(2) + " " + struct_name + "* arg" + fn_line.group(4) + "\n"
 657                 map_fn(dummy_line, re.compile("([A-Za-z_0-9]*) *([A-Za-z_0-9]*) *(.*)").match(dummy_line), None, "(arg_conv->" + fn_line.group(2) + ")(arg_conv->this_arg")
 658
 659     out_c.write("""#include \"org_ldk_impl_bindings.h\"
 660 #include <rust_types.h>
 661 #include <lightning.h>
 662 #include <string.h>
 663 #include <stdatomic.h>
 664 """)
 665
 666     if sys.argv[4] == "false":
 667         out_c.write("#define MALLOC(a, _) malloc(a)\n")
 668         out_c.write("#define FREE free\n")
 669         out_c.write("#define DO_ASSERT(a) (void)(a)\n")
 670     else:
 671         out_c.write("""#include <assert.h>
 672 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
 673
 674 // Running a leak check across all the allocations and frees of the JDK is a mess,
 675 // so instead we implement our own naive leak checker here, relying on the -wrap
 676 // linker option to wrap malloc/calloc/realloc/free, tracking everyhing allocated
 677 // and free'd in Rust or C across the generated bindings shared library.
 678 #include <threads.h>
 679 #include <execinfo.h>
 680 #include <unistd.h>
 681 static mtx_t allocation_mtx;
 682
 683 void __attribute__((constructor)) init_mtx() {
 684         DO_ASSERT(mtx_init(&allocation_mtx, mtx_plain) == thrd_success);
 685 }
 686
 687 #define BT_MAX 128
 688 typedef struct allocation {
 689         struct allocation* next;
 690         void* ptr;
 691         const char* struct_name;
 692         void* bt[BT_MAX];
 693         int bt_len;
 694 } allocation;
 695 static allocation* allocation_ll = NULL;
 696
 697 void* __real_malloc(size_t len);
 698 void* __real_calloc(size_t nmemb, size_t len);
 699 static void new_allocation(void* res, const char* struct_name) {
 700         allocation* new_alloc = __real_malloc(sizeof(allocation));
 701         new_alloc->ptr = res;
 702         new_alloc->struct_name = struct_name;
 703         new_alloc->bt_len = backtrace(new_alloc->bt, BT_MAX);
 704         DO_ASSERT(mtx_lock(&allocation_mtx) == thrd_success);
 705         new_alloc->next = allocation_ll;
 706         allocation_ll = new_alloc;
 707         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
 708 }
 709 static void* MALLOC(size_t len, const char* struct_name) {
 710         void* res = __real_malloc(len);
 711         new_allocation(res, struct_name);
 712         return res;
 713 }
 714 void __real_free(void* ptr);
 715 static void alloc_freed(void* ptr) {
 716         allocation* p = NULL;
 717         DO_ASSERT(mtx_lock(&allocation_mtx) == thrd_success);
 718         allocation* it = allocation_ll;
 719         while (it->ptr != ptr) { p = it; it = it->next; }
 720         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
 721         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
 722         DO_ASSERT(it->ptr == ptr);
 723         __real_free(it);
 724 }
 725 static void FREE(void* ptr) {
 726         alloc_freed(ptr);
 727         __real_free(ptr);
 728 }
 729
 730 void* __wrap_malloc(size_t len) {
 731         void* res = __real_malloc(len);
 732         new_allocation(res, "malloc call");
 733         return res;
 734 }
 735 void* __wrap_calloc(size_t nmemb, size_t len) {
 736         void* res = __real_calloc(nmemb, len);
 737         new_allocation(res, "calloc call");
 738         return res;
 739 }
 740 void __wrap_free(void* ptr) {
 741         alloc_freed(ptr);
 742         __real_free(ptr);
 743 }
 744
 745 void* __real_realloc(void* ptr, size_t newlen);
 746 void* __wrap_realloc(void* ptr, size_t len) {
 747         alloc_freed(ptr);
 748         void* res = __real_realloc(ptr, len);
 749         new_allocation(res, "realloc call");
 750         return res;
 751 }
 752 void __wrap_reallocarray(void* ptr, size_t new_sz) {
 753         // Rust doesn't seem to use reallocarray currently
 754         assert(false);
 755 }
 756
 757 void __attribute__((destructor)) check_leaks() {
 758         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 759                 fprintf(stderr, "%s %p remains:\\n", a->struct_name, a->ptr);
 760                 backtrace_symbols_fd(a->bt, a->bt_len, STDERR_FILENO);
 761                 fprintf(stderr, "\\n\\n");
 762         }
 763         DO_ASSERT(allocation_ll == NULL);
 764 }
 765 """)
 766     out_java.write("""package org.ldk.impl;
 767 import org.ldk.enums.*;
 768
 769 public class bindings {
 770         public static class VecOrSliceDef {
 771                 public long dataptr;
 772                 public long datalen;
 773                 public long stride;
 774                 public VecOrSliceDef(long dataptr, long datalen, long stride) {
 775                         this.dataptr = dataptr; this.datalen = datalen; this.stride = stride;
 776                 }
 777         }
 778         static {
 779                 System.loadLibrary(\"lightningjni\");
 780                 init(java.lang.Enum.class, VecOrSliceDef.class);
 781         }
 782         static native void init(java.lang.Class c, java.lang.Class slicedef);
 783
 784         public static native boolean deref_bool(long ptr);
 785         public static native long deref_long(long ptr);
 786         public static native void free_heap_ptr(long ptr);
 787         public static native byte[] read_bytes(long ptr, long len);
 788         public static native byte[] get_u8_slice_bytes(long slice_ptr);
 789         public static native long bytes_to_u8_vec(byte[] bytes);
 790         public static native long new_txpointer_copy_data(byte[] txdata);
 791         public static native long vec_slice_len(long vec);
 792         public static native long new_empty_slice_vec();
 793
 794 """)
 795     out_c.write("""
 796 static jmethodID ordinal_meth = NULL;
 797 static jmethodID slicedef_meth = NULL;
 798 static jclass slicedef_cls = NULL;
 799 JNIEXPORT void Java_org_ldk_impl_bindings_init(JNIEnv * env, jclass _b, jclass enum_class, jclass slicedef_class) {
 800         ordinal_meth = (*env)->GetMethodID(env, enum_class, "ordinal", "()I");
 801         DO_ASSERT(ordinal_meth != NULL);
 802         slicedef_meth = (*env)->GetMethodID(env, slicedef_class, "<init>", "(JJJ)V");
 803         DO_ASSERT(slicedef_meth != NULL);
 804         slicedef_cls = (*env)->NewGlobalRef(env, slicedef_class);
 805         DO_ASSERT(slicedef_cls != NULL);
 806 }
 807
 808 JNIEXPORT jboolean JNICALL Java_org_ldk_impl_bindings_deref_1bool (JNIEnv * env, jclass _a, jlong ptr) {
 809         return *((bool*)ptr);
 810 }
 811 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_deref_1long (JNIEnv * env, jclass _a, jlong ptr) {
 812         return *((long*)ptr);
 813 }
 814 JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_free_1heap_1ptr (JNIEnv * env, jclass _a, jlong ptr) {
 815         FREE((void*)ptr);
 816 }
 817 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_read_1bytes (JNIEnv * _env, jclass _b, jlong ptr, jlong len) {
 818         jbyteArray ret_arr = (*_env)->NewByteArray(_env, len);
 819         (*_env)->SetByteArrayRegion(_env, ret_arr, 0, len, (unsigned char*)ptr);
 820         return ret_arr;
 821 }
 822 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_get_1u8_1slice_1bytes (JNIEnv * _env, jclass _b, jlong slice_ptr) {
 823         LDKu8slice *slice = (LDKu8slice*)slice_ptr;
 824         jbyteArray ret_arr = (*_env)->NewByteArray(_env, slice->datalen);
 825         (*_env)->SetByteArrayRegion(_env, ret_arr, 0, slice->datalen, slice->data);
 826         return ret_arr;
 827 }
 828 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_bytes_1to_1u8_1vec (JNIEnv * _env, jclass _b, jbyteArray bytes) {
 829         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "LDKCVec_u8");
 830         vec->datalen = (*_env)->GetArrayLength(_env, bytes);
 831         vec->data = (uint8_t*)MALLOC(vec->datalen, "LDKCVec_u8Z Bytes");
 832         (*_env)->GetByteArrayRegion (_env, bytes, 0, vec->datalen, vec->data);
 833         return (long)vec;
 834 }
 835 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_new_1txpointer_1copy_1data (JNIEnv * env, jclass _b, jbyteArray bytes) {
 836         LDKTransaction *txdata = (LDKTransaction*)MALLOC(sizeof(LDKTransaction), "LDKTransaction");
 837         txdata->datalen = (*env)->GetArrayLength(env, bytes);
 838         txdata->data = (uint8_t*)MALLOC(txdata->datalen, "Tx Data Bytes");
 839         txdata->data_is_owned = true;
 840         (*env)->GetByteArrayRegion (env, bytes, 0, txdata->datalen, txdata->data);
 841         return (long)txdata;
 842 }
 843 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_vec_1slice_1len (JNIEnv * env, jclass _a, jlong ptr) {
 844         // Check offsets of a few Vec types are all consistent as we're meant to be generic across types
 845         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_SignatureZ, datalen), "Vec<*> needs to be mapped identically");
 846         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_MessageSendEventZ, datalen), "Vec<*> needs to be mapped identically");
 847         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_EventZ, datalen), "Vec<*> needs to be mapped identically");
 848         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_C2Tuple_usizeTransactionZZ, datalen), "Vec<*> needs to be mapped identically");
 849         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)ptr;
 850         return (long)vec->datalen;
 851 }
 852 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_new_1empty_1slice_1vec (JNIEnv * _env, jclass _b) {
 853         // Check sizes of a few Vec types are all consistent as we're meant to be generic across types
 854         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_SignatureZ), "Vec<*> needs to be mapped identically");
 855         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_MessageSendEventZ), "Vec<*> needs to be mapped identically");
 856         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_EventZ), "Vec<*> needs to be mapped identically");
 857         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_C2Tuple_usizeTransactionZZ), "Vec<*> needs to be mapped identically");
 858         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "Empty LDKCVec");
 859         vec->data = NULL;
 860         vec->datalen = 0;
 861         return (long)vec;
 862 }
 863
 864 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
 865 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
 866 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
 867 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
 868
 869 """)
 870
 871     # XXX: Temporarily write out a manual SecretKey_new() for testing, we should auto-gen this kind of thing
 872     out_java.write("\tpublic static native long LDKSecretKey_new();\n\n") # TODO: rm me
 873     out_c.write("JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_LDKSecretKey_1new(JNIEnv * _env, jclass _b) {\n") # TODO: rm me
 874     out_c.write("\tLDKSecretKey* key = (LDKSecretKey*)MALLOC(sizeof(LDKSecretKey), \"LDKSecretKey\");\n") # TODO: rm me
 875     out_c.write("\treturn (long)key;\n") # TODO: rm me
 876     out_c.write("}\n") # TODO: rm me
 877
 878     in_block_comment = False
 879     cur_block_obj = None
 880
 881     fn_ptr_regex = re.compile("^extern const ([A-Za-z_0-9\* ]*) \(\*(.*)\)\((.*)\);$")
 882     fn_ret_arr_regex = re.compile("(.*) \(\*(.*)\((.*)\)\)\[([0-9]*)\];$")
 883     reg_fn_regex = re.compile("([A-Za-z_0-9\* ]* \*?)([a-zA-Z_0-9]*)\((.*)\);$")
 884     const_val_regex = re.compile("^extern const ([A-Za-z_0-9]*) ([A-Za-z_0-9]*);$")
 885
 886     line_indicates_result_regex = re.compile("^   bool result_ok;$")
 887     line_indicates_vec_regex = re.compile("^   ([A-Za-z_0-9]*) \*data;$")
 888     line_indicates_opaque_regex = re.compile("^   bool is_owned;$")
 889     line_indicates_trait_regex = re.compile("^   ([A-Za-z_0-9]* \*?)\(\*([A-Za-z_0-9]*)\)\((const )?void \*this_arg(.*)\);$")
 890     assert(line_indicates_trait_regex.match("   uintptr_t (*send_data)(void *this_arg, LDKu8slice data, bool resume_read);"))
 891     assert(line_indicates_trait_regex.match("   LDKCVec_MessageSendEventZ (*get_and_clear_pending_msg_events)(const void *this_arg);"))
 892     assert(line_indicates_trait_regex.match("   void *(*clone)(const void *this_arg);"))
 893     line_field_var_regex = re.compile("^   ([A-Za-z_0-9]*) ([A-Za-z_0-9]*);$")
 894     assert(line_field_var_regex.match("   LDKMessageSendEventsProvider MessageSendEventsProvider;"))
 895     struct_name_regex = re.compile("^typedef (struct|enum|union) (MUST_USE_STRUCT )?(LDK[A-Za-z_0-9]*) {$")
 896     assert(struct_name_regex.match("typedef struct LDKCVecTempl_u8 {"))
 897     assert(struct_name_regex.match("typedef enum LDKNetwork {"))
 898     struct_alias_regex = re.compile("^typedef (LDK[A-Za-z_0-9]*) (LDK[A-Za-z_0-9]*);$")
 899     assert(struct_alias_regex.match("typedef LDKCResultTempl_bool__PeerHandleError LDKCResult_boolPeerHandleErrorZ;"))
 900
 901     result_templ_structs = set()
 902     union_enum_items = {}
 903     for line in in_h:
 904         if in_block_comment:
 905             if line.endswith("*/\n"):
 906                 in_block_comment = False
 907         elif cur_block_obj is not None:
 908             cur_block_obj  = cur_block_obj + line
 909             if line.startswith("} "):
 910                 field_lines = []
 911                 struct_name = None
 912                 vec_ty = None
 913                 obj_lines = cur_block_obj.split("\n")
 914                 is_opaque = False
 915                 is_result = False
 916                 is_unitary_enum = False
 917                 is_union_enum = False
 918                 is_union = False
 919                 is_tuple = False
 920                 trait_fn_lines = []
 921                 field_var_lines = []
 922
 923                 for idx, struct_line in enumerate(obj_lines):
 924                     if struct_line.strip().startswith("/*"):
 925                         in_block_comment = True
 926                     if in_block_comment:
 927                         if struct_line.endswith("*/"):
 928                             in_block_comment = False
 929                     else:
 930                         struct_name_match = struct_name_regex.match(struct_line)
 931                         if struct_name_match is not None:
 932                             struct_name = struct_name_match.group(3)
 933                             if struct_name_match.group(1) == "enum":
 934                                 if not struct_name.endswith("_Tag"):
 935                                     is_unitary_enum = True
 936                                 else:
 937                                     is_union_enum = True
 938                             elif struct_name_match.group(1) == "union":
 939                                 is_union = True
 940                         if line_indicates_opaque_regex.match(struct_line):
 941                             is_opaque = True
 942                         elif line_indicates_result_regex.match(struct_line):
 943                             is_result = True
 944                         vec_ty_match = line_indicates_vec_regex.match(struct_line)
 945                         if vec_ty_match is not None and struct_name.startswith("LDKCVecTempl_"):
 946                             vec_ty = vec_ty_match.group(1)
 947                         elif struct_name.startswith("LDKC2TupleTempl_") or struct_name.startswith("LDKC3TupleTempl_"):
 948                             is_tuple = True
 949                         trait_fn_match = line_indicates_trait_regex.match(struct_line)
 950                         if trait_fn_match is not None:
 951                             trait_fn_lines.append(trait_fn_match)
 952                         field_var_match = line_field_var_regex.match(struct_line)
 953                         if field_var_match is not None:
 954                             field_var_lines.append(field_var_match)
 955                         field_lines.append(struct_line)
 956
 957                 assert(struct_name is not None)
 958                 assert(len(trait_fn_lines) == 0 or not (is_opaque or is_unitary_enum or is_union_enum or is_union or is_result or vec_ty is not None))
 959                 assert(not is_opaque or not (len(trait_fn_lines) != 0 or is_unitary_enum or is_union_enum or is_union or is_result or vec_ty is not None))
 960                 assert(not is_unitary_enum or not (len(trait_fn_lines) != 0 or is_opaque or is_union_enum or is_union or is_result or vec_ty is not None))
 961                 assert(not is_union_enum or not (len(trait_fn_lines) != 0 or is_unitary_enum or is_opaque or is_union or is_result or vec_ty is not None))
 962                 assert(not is_union or not (len(trait_fn_lines) != 0 or is_unitary_enum or is_union_enum or is_opaque or is_result or vec_ty is not None))
 963                 assert(not is_result or not (len(trait_fn_lines) != 0 or is_unitary_enum or is_union_enum or is_opaque or is_union or vec_ty is not None))
 964                 assert(vec_ty is None or not (len(trait_fn_lines) != 0 or is_unitary_enum or is_union_enum or is_opaque or is_union or is_result))
 965
 966                 if is_opaque:
 967                     opaque_structs.add(struct_name)
 968                 elif is_result:
 969                     result_templ_structs.add(struct_name)
 970                 elif is_tuple:
 971                     out_java.write("\tpublic static native long " + struct_name + "_new(")
 972                     out_c.write("JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1new(JNIEnv *_env, jclass _b")
 973                     for idx, line in enumerate(field_lines):
 974                         if idx != 0 and idx < len(field_lines) - 2:
 975                             ty_info = java_c_types(line.strip(';'), None)
 976                             if idx != 1:
 977                                 out_java.write(", ")
 978                             e = chr(ord('a') + idx - 1)
 979                             out_java.write(ty_info.java_ty + " " + e)
 980                             out_c.write(", " + ty_info.c_ty + " " + e)
 981                     out_java.write(");\n")
 982                     out_c.write(") {\n")
 983                     out_c.write("\t" + struct_name + "* ret = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n")
 984                     for idx, line in enumerate(field_lines):
 985                         if idx != 0 and idx < len(field_lines) - 2:
 986                             ty_info = map_type(line.strip(';'), False, None, False)
 987                             e = chr(ord('a') + idx - 1)
 988                             if ty_info.arg_conv is not None:
 989                                 out_c.write("\t" + ty_info.arg_conv.replace("\n", "\n\t"))
 990                                 out_c.write("\n\tret->" + e + " = " + ty_info.arg_conv_name + ";\n")
 991                             else:
 992                                 out_c.write("\tret->" + e + " = " + e + ";\n")
 993                     out_c.write("\treturn (long)ret;\n")
 994                     out_c.write("}\n")
 995                 elif vec_ty is not None:
 996                     if vec_ty in opaque_structs:
 997                         out_java.write("\tpublic static native long[] " + struct_name + "_arr_info(long vec_ptr);\n")
 998                         out_c.write("JNIEXPORT jlongArray JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1arr_1info(JNIEnv *env, jclass _b, jlong ptr) {\n")
 999                     else:
1000                         out_java.write("\tpublic static native VecOrSliceDef " + struct_name + "_arr_info(long vec_ptr);\n")
1001                         out_c.write("JNIEXPORT jobject JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1arr_1info(JNIEnv *env, jclass _b, jlong ptr) {\n")
1002                     out_c.write("\t" + struct_name + " *vec = (" + struct_name + "*)ptr;\n")
1003                     if vec_ty in opaque_structs:
1004                         out_c.write("\tjlongArray ret = (*env)->NewLongArray(env, vec->datalen);\n")
1005                         out_c.write("\tjlong *ret_elems = (*env)->GetPrimitiveArrayCritical(env, ret, NULL);\n")
1006                         out_c.write("\tfor (size_t i = 0; i < vec->datalen; i++) {\n")
1007                         out_c.write("\t\tDO_ASSERT((((long)vec->data[i].inner) & 1) == 0);\n")
1008                         out_c.write("\t\tret_elems[i] = (long)vec->data[i].inner | (vec->data[i].is_owned ? 1 : 0);\n")
1009                         out_c.write("\t}\n")
1010                         out_c.write("\t(*env)->ReleasePrimitiveArrayCritical(env, ret, ret_elems, 0);\n")
1011                         out_c.write("\treturn ret;\n")
1012                     else:
1013                         out_c.write("\treturn (*env)->NewObject(env, slicedef_cls, slicedef_meth, (long)vec->data, (long)vec->datalen, sizeof(" + vec_ty + "));\n")
1014                     out_c.write("}\n")
1015
1016                     ty_info = map_type(vec_ty + " arr_elem", False, None, False)
1017                     out_java.write("\tpublic static native long " + struct_name + "_new(" + ty_info.java_ty + "[] elems);\n")
1018                     out_c.write("JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1new(JNIEnv *env, jclass _b, j" + ty_info.java_ty + "Array elems){\n")
1019                     out_c.write("\t" + struct_name + " *ret = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n")
1020                     out_c.write("\tret->datalen = (*env)->GetArrayLength(env, elems);\n")
1021                     out_c.write("\tif (ret->datalen == 0) {\n")
1022                     out_c.write("\t\tret->data = NULL;\n")
1023                     out_c.write("\t} else {\n")
1024                     out_c.write("\t\tret->data = MALLOC(sizeof(" + vec_ty + ") * ret->datalen, \"" + struct_name + " Data\");\n")
1025                     assert len(ty_info.java_fn_ty_arg) == 1 # ie we're a primitive of some form
1026                     out_c.write("\t\t" + ty_info.c_ty + " *java_elems = (*env)->GetPrimitiveArrayCritical(env, elems, NULL);\n")
1027                     out_c.write("\t\tfor (size_t i = 0; i < ret->datalen; i++) {\n")
1028                     if ty_info.arg_conv is not None:
1029                         out_c.write("\t\t\t" + ty_info.c_ty + " arr_elem = java_elems[i];\n")
1030                         out_c.write("\t\t\t" + ty_info.arg_conv.replace("\n", "\n\t\t\t") + "\n")
1031                         out_c.write("\t\t\tret->data[i] = " + ty_info.arg_conv_name + ";\n")
1032                     else:
1033                         out_c.write("\t\t\tret->data[i] = java_elems[i];\n")
1034                     out_c.write("\t\t}\n")
1035                     out_c.write("\t\t(*env)->ReleasePrimitiveArrayCritical(env, elems, java_elems, 0);\n")
1036                     out_c.write("\t}\n")
1037                     out_c.write("\treturn (long)ret;\n")
1038                     out_c.write("}\n")
1039                 elif is_union_enum:
1040                     assert(struct_name.endswith("_Tag"))
1041                     struct_name = struct_name[:-4]
1042                     union_enum_items[struct_name] = {"field_lines": field_lines}
1043                 elif struct_name.endswith("_Body") and struct_name.split("_")[0] in union_enum_items:
1044                     enum_var_name = struct_name.split("_")
1045                     union_enum_items[enum_var_name[0]][enum_var_name[1]] = field_lines
1046                 elif struct_name in union_enum_items:
1047                     map_complex_enum(struct_name, union_enum_items[struct_name])
1048                 elif is_unitary_enum:
1049                     map_unitary_enum(struct_name, field_lines)
1050                 elif len(trait_fn_lines) > 0:
1051                     trait_structs.add(struct_name)
1052                     map_trait(struct_name, field_var_lines, trait_fn_lines)
1053                 cur_block_obj = None
1054         else:
1055             fn_ptr = fn_ptr_regex.match(line)
1056             fn_ret_arr = fn_ret_arr_regex.match(line)
1057             reg_fn = reg_fn_regex.match(line)
1058             const_val = const_val_regex.match(line)
1059
1060             if line.startswith("#include <"):
1061                 pass
1062             elif line.startswith("/*"):
1063                 #out_java.write("\t" + line)
1064                 if not line.endswith("*/\n"):
1065                     in_block_comment = True
1066             elif line.startswith("typedef enum "):
1067                 cur_block_obj = line
1068             elif line.startswith("typedef struct "):
1069                 cur_block_obj = line
1070             elif line.startswith("typedef union "):
1071                 cur_block_obj = line
1072             elif line.startswith("typedef "):
1073                 alias_match =  struct_alias_regex.match(line)
1074                 if alias_match.group(1) in result_templ_structs:
1075                     out_java.write("\tpublic static native boolean " + alias_match.group(2) + "_result_ok(long arg);\n")
1076                     out_java.write("\tpublic static native long " + alias_match.group(2) + "_get_inner(long arg);\n")
1077                     out_c.write("JNIEXPORT jboolean JNICALL Java_org_ldk_impl_bindings_" + alias_match.group(2).replace("_", "_1") + "_1result_1ok (JNIEnv * env, jclass _a, jlong arg) {\n")
1078                     out_c.write("\treturn ((" + alias_match.group(2) + "*)arg)->result_ok;\n")
1079                     out_c.write("}\n")
1080                     out_c.write("JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_" + alias_match.group(2).replace("_", "_1") + "_1get_1inner (JNIEnv * env, jclass _a, jlong arg) {\n")
1081                     out_c.write("\tif (((" + alias_match.group(2) + "*)arg)->result_ok) {\n")
1082                     out_c.write("\t\treturn (long)((" + alias_match.group(2) + "*)arg)->contents.result;\n")
1083                     out_c.write("\t} else {\n")
1084                     out_c.write("\t\treturn (long)((" + alias_match.group(2) + "*)arg)->contents.err;\n")
1085                     out_c.write("\t}\n}\n")
1086                 pass
1087             elif fn_ptr is not None:
1088                 map_fn(line, fn_ptr, None, None)
1089             elif fn_ret_arr is not None:
1090                 map_fn(line, fn_ret_arr, fn_ret_arr.group(4), None)
1091             elif reg_fn is not None:
1092                 map_fn(line, reg_fn, None, None)
1093             elif const_val_regex is not None:
1094                 # TODO Map const variables
1095                 pass
1096             else:
1097                 assert(line == "\n")
1098
1099     out_java.write("}\n")