_ 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                     if ty_info.rust_obj != "LDKu8slice":
 188                         # Don't bother free'ing slices passed in - we often pass them Rust -> Rust
 189                         base_conv = base_conv + "\nFREE((void*)" + ty_info.var_name + ");";
 190                     if ty_info.rust_obj in opaque_structs:
 191                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 192                             arg_conv = base_conv + "\n" + ty_info.var_name + "_conv.is_owned = true;",
 193                             arg_conv_name = ty_info.var_name + "_conv",
 194                             ret_conv = None, ret_conv_name = None)
 195
 196                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 197                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv",
 198                         ret_conv = None, ret_conv_name = None)
 199                 else:
 200                     assert(not is_free)
 201                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 202                         arg_conv = ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)" + ty_info.var_name + ";",
 203                         arg_conv_name = ty_info.var_name + "_conv",
 204                         ret_conv = None, ret_conv_name = None)
 205             elif ty_info.is_ptr:
 206                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 207                     arg_conv = None, arg_conv_name = ty_info.var_name, ret_conv = None, ret_conv_name = None)
 208             elif ty_info.java_ty == "String":
 209                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 210                     arg_conv = None, arg_conv_name = None,
 211                     ret_conv = ("jstring " + ty_info.var_name + "_conv = (*_env)->NewStringUTF(_env, ", ");"), ret_conv_name = ty_info.var_name + "_conv")
 212             else:
 213                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 214                     arg_conv = None, arg_conv_name = ty_info.var_name, ret_conv = None, ret_conv_name = None)
 215         elif not print_void:
 216             # We don't have a parameter name, and want one, just call it arg
 217             if ty_info.rust_obj is not None:
 218                 assert(not is_free or ty_info.rust_obj not in opaque_structs);
 219                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 220                     arg_conv = ty_info.rust_obj + " arg_conv = *(" + ty_info.rust_obj + "*)arg;\nFREE((void*)arg);",
 221                     arg_conv_name = "arg_conv",
 222                     ret_conv = None, ret_conv_name = None)
 223             else:
 224                 assert(not is_free)
 225                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 226                     arg_conv = None, arg_conv_name = "arg", ret_conv = None, ret_conv_name = None)
 227         else:
 228             # We don't have a parameter name, and don't want one (cause we're returning)
 229             if ty_info.rust_obj is not None:
 230                 if not ty_info.is_ptr:
 231                     if ty_info.rust_obj in unitary_enums:
 232                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 233                             arg_conv = ty_info.rust_obj + " ret = " + ty_info.rust_obj + "_from_java(_env, " + ty_info.var_name + ");",
 234                             arg_conv_name = "ret",
 235                             ret_conv = ("jclass ret = " + ty_info.rust_obj + "_to_java(_env, ", ");"), ret_conv_name = "ret")
 236                     if ty_info.rust_obj in opaque_structs:
 237                         # If we're returning a newly-allocated struct, we don't want Rust to ever
 238                         # free, instead relying on the Java GC to lose the ref. We undo this in
 239                         # any _free function.
 240                         # To avoid any issues, we first assert that the incoming object is non-ref.
 241                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 242                             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;"),
 243                             ret_conv_name = "(long)ret",
 244                             arg_conv = None, arg_conv_name = None)
 245                     else:
 246                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 247                             ret_conv = (ty_info.rust_obj + "* ret = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n*ret = ", ";"),
 248                             ret_conv_name = "(long)ret",
 249                             arg_conv = None, arg_conv_name = None)
 250                 else:
 251                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 252                         ret_conv = ("long ret = (long)", ";"), ret_conv_name = "ret",
 253                         arg_conv = None, arg_conv_name = None)
 254             else:
 255                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 256                     arg_conv = None, arg_conv_name = None, ret_conv = None, ret_conv_name = None)
 257
 258     def map_fn(line, re_match, ret_arr_len, c_call_string):
 259         out_java.write("\t// " + line)
 260         out_java.write("\tpublic static native ")
 261         out_c.write("JNIEXPORT ")
 262
 263         ret_info = map_type(re_match.group(1), True, ret_arr_len, False)
 264         ret_info.print_ty()
 265         if ret_info.ret_conv is not None:
 266             ret_conv_pfx, ret_conv_sfx = ret_info.ret_conv
 267
 268         out_java.write(" " + re_match.group(2) + "(")
 269         out_c.write(" JNICALL Java_org_ldk_impl_bindings_" + re_match.group(2).replace('_', '_1') + "(JNIEnv * _env, jclass _b")
 270
 271         arg_names = []
 272         for idx, arg in enumerate(re_match.group(3).split(',')):
 273             if idx != 0:
 274                 out_java.write(", ")
 275             if arg != "void":
 276                 out_c.write(", ")
 277             arg_conv_info = map_type(arg, False, None, re_match.group(2).endswith("_free"))
 278             if arg_conv_info.c_ty != "void":
 279                 arg_conv_info.print_ty()
 280                 arg_conv_info.print_name()
 281             arg_names.append(arg_conv_info)
 282
 283         out_java.write(");\n")
 284         out_c.write(") {\n")
 285
 286         for info in arg_names:
 287             if info.arg_conv is not None:
 288                 out_c.write("\t" + info.arg_conv.replace('\n', "\n\t") + "\n");
 289
 290         if ret_info.ret_conv is not None:
 291             out_c.write("\t" + ret_conv_pfx.replace('\n', '\n\t'));
 292         else:
 293             out_c.write("\treturn ");
 294
 295         if c_call_string is None:
 296             out_c.write(re_match.group(2) + "(")
 297         else:
 298             out_c.write(c_call_string)
 299         for idx, info in enumerate(arg_names):
 300             if info.arg_conv_name is not None:
 301                 if idx != 0:
 302                     out_c.write(", ")
 303                 elif c_call_string is not None:
 304                     continue
 305                 out_c.write(info.arg_conv_name)
 306         out_c.write(")")
 307         if ret_info.ret_conv is not None:
 308             out_c.write(ret_conv_sfx.replace('\n', '\n\t'))
 309             out_c.write("\n\treturn " + ret_info.ret_conv_name + ";")
 310         else:
 311             out_c.write(";")
 312         out_c.write("\n}\n\n")
 313
 314     def map_trait(struct_name, field_var_lines, trait_fn_lines):
 315         out_c.write("typedef struct " + struct_name + "_JCalls {\n")
 316         out_c.write("\tatomic_size_t refcnt;\n")
 317         out_c.write("\tJNIEnv *env;\n")
 318         out_c.write("\tjobject o;\n")
 319         for var_line in field_var_lines:
 320             if var_line.group(1) in trait_structs:
 321                 out_c.write("\t" + var_line.group(1) + "_JCalls* " + var_line.group(2) + ";\n")
 322         for fn_line in trait_fn_lines:
 323             if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
 324                 out_c.write("\tjmethodID " + fn_line.group(2) + "_meth;\n")
 325         out_c.write("} " + struct_name + "_JCalls;\n")
 326
 327         out_java.write("\tpublic interface " + struct_name + " {\n")
 328         java_meths = []
 329         for fn_line in trait_fn_lines:
 330             java_meth_descr = "("
 331             if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
 332                 ret_ty_info = java_c_types(fn_line.group(1), None)
 333
 334                 out_java.write("\t\t " + ret_ty_info.java_ty + " " + fn_line.group(2) + "(")
 335                 is_const = fn_line.group(3) is not None
 336                 out_c.write(fn_line.group(1) + fn_line.group(2) + "_jcall(")
 337                 if is_const:
 338                     out_c.write("const void* this_arg")
 339                 else:
 340                     out_c.write("void* this_arg")
 341
 342                 arg_names = []
 343                 for idx, arg in enumerate(fn_line.group(4).split(',')):
 344                     if arg == "":
 345                         continue
 346                     if idx >= 2:
 347                         out_java.write(", ")
 348                     out_c.write(", ")
 349                     arg_conv_info = map_type(arg, True, None, False)
 350                     out_c.write(arg.strip())
 351                     out_java.write(arg_conv_info.java_ty + " " + arg_conv_info.arg_name)
 352                     arg_names.append(arg_conv_info)
 353                     java_meth_descr = java_meth_descr + arg_conv_info.java_fn_ty_arg
 354                 java_meth_descr = java_meth_descr + ")" + ret_ty_info.java_fn_ty_arg
 355                 java_meths.append(java_meth_descr)
 356
 357                 out_java.write(");\n")
 358                 out_c.write(") {\n")
 359                 out_c.write("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
 360
 361                 for arg_info in arg_names:
 362                     if arg_info.ret_conv is not None:
 363                         out_c.write("\t" + arg_info.ret_conv[0].replace('\n', '\n\t').replace("_env", "j_calls->env"));
 364                         out_c.write(arg_info.arg_name)
 365                         out_c.write(arg_info.ret_conv[1].replace('\n', '\n\t').replace("_env", "j_calls->env") + "\n")
 366
 367                 if not ret_ty_info.passed_as_ptr:
 368                     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")
 369                 else:
 370                     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");
 371
 372                 for arg_info in arg_names:
 373                     if arg_info.ret_conv is not None:
 374                         out_c.write(", " + arg_info.ret_conv_name)
 375                     else:
 376                         out_c.write(", " + arg_info.arg_name)
 377                 out_c.write(");\n");
 378
 379                 if ret_ty_info.passed_as_ptr:
 380                     out_c.write("\t" + fn_line.group(1).strip() + " res = *ret;\n")
 381                     out_c.write("\tFREE(ret);\n")
 382                     out_c.write("\treturn res;\n")
 383                 out_c.write("}\n")
 384             elif fn_line.group(2) == "free":
 385                 out_c.write("static void " + struct_name + "_JCalls_free(void* this_arg) {\n")
 386                 out_c.write("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
 387                 out_c.write("\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n")
 388                 out_c.write("\t\t(*j_calls->env)->DeleteGlobalRef(j_calls->env, j_calls->o);\n")
 389                 out_c.write("\t\tFREE(j_calls);\n")
 390                 out_c.write("\t}\n}\n")
 391
 392         # Write out a clone function whether we need one or not, as we use them in moving to rust
 393         out_c.write("static void* " + struct_name + "_JCalls_clone(const void* this_arg) {\n")
 394         out_c.write("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
 395         out_c.write("\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n")
 396         for var_line in field_var_lines:
 397             if var_line.group(1) in trait_structs:
 398                 out_c.write("\tatomic_fetch_add_explicit(&j_calls->" + var_line.group(2) + "->refcnt, 1, memory_order_release);\n")
 399         out_c.write("\treturn (void*) this_arg;\n")
 400         out_c.write("}\n")
 401
 402         out_java.write("\t}\n")
 403
 404         out_java.write("\tpublic static native long " + struct_name + "_new(" + struct_name + " impl")
 405         out_c.write("static inline " + struct_name + " " + struct_name + "_init (JNIEnv * env, jclass _a, jobject o")
 406         for var_line in field_var_lines:
 407             if var_line.group(1) in trait_structs:
 408                 out_java.write(", " + var_line.group(1) + " " + var_line.group(2))
 409                 out_c.write(", jobject " + var_line.group(2))
 410         out_java.write(");\n")
 411         out_c.write(") {\n")
 412
 413         out_c.write("\tjclass c = (*env)->GetObjectClass(env, o);\n")
 414         out_c.write("\tassert(c != NULL);\n")
 415         out_c.write("\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n")
 416         out_c.write("\tatomic_init(&calls->refcnt, 1);\n")
 417         out_c.write("\tcalls->env = env;\n")
 418         out_c.write("\tcalls->o = (*env)->NewGlobalRef(env, o);\n")
 419         for (fn_line, java_meth_descr) in zip(trait_fn_lines, java_meths):
 420             if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
 421                 out_c.write("\tcalls->" + fn_line.group(2) + "_meth = (*env)->GetMethodID(env, c, \"" + fn_line.group(2) + "\", \"" + java_meth_descr + "\");\n")
 422                 out_c.write("\tassert(calls->" + fn_line.group(2) + "_meth != NULL);\n")
 423         out_c.write("\n\t" + struct_name + " ret = {\n")
 424         out_c.write("\t\t.this_arg = (void*) calls,\n")
 425         for fn_line in trait_fn_lines:
 426             if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
 427                 out_c.write("\t\t." + fn_line.group(2) + " = " + fn_line.group(2) + "_jcall,\n")
 428             elif fn_line.group(2) == "free":
 429                 out_c.write("\t\t.free = " + struct_name + "_JCalls_free,\n")
 430             else:
 431                 out_c.write("\t\t.clone = " + struct_name + "_JCalls_clone,\n")
 432         for var_line in field_var_lines:
 433             if var_line.group(1) in trait_structs:
 434                 out_c.write("\t\t." + var_line.group(2) + " = " + var_line.group(1) + "_init(env, _a, " + var_line.group(2) + "),\n")
 435         out_c.write("\t};\n")
 436         for var_line in field_var_lines:
 437             if var_line.group(1) in trait_structs:
 438                 out_c.write("\tcalls->" + var_line.group(2) + " = ret." + var_line.group(2) + ".this_arg;\n")
 439         out_c.write("\treturn ret;\n")
 440         out_c.write("}\n")
 441
 442         out_c.write("JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1new (JNIEnv * env, jclass _a, jobject o")
 443         for var_line in field_var_lines:
 444             if var_line.group(1) in trait_structs:
 445                 out_c.write(", jobject " + var_line.group(2))
 446         out_c.write(") {\n")
 447         out_c.write("\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n")
 448         out_c.write("\t*res_ptr = " + struct_name + "_init(env, _a, o")
 449         for var_line in field_var_lines:
 450             if var_line.group(1) in trait_structs:
 451                 out_c.write(", " + var_line.group(2))
 452         out_c.write(");\n")
 453         out_c.write("\treturn (long)res_ptr;\n")
 454         out_c.write("}\n")
 455
 456         out_java.write("\tpublic static native " + struct_name + " " + struct_name + "_get_obj_from_jcalls(long val);\n")
 457         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")
 458         out_c.write("\treturn ((" + struct_name + "_JCalls*)val)->o;\n")
 459         out_c.write("}\n")
 460
 461         for fn_line in trait_fn_lines:
 462             # For now, just disable enabling the _call_log - we don't know how to inverse-map String
 463             is_log = fn_line.group(2) == "log" and struct_name == "LDKLogger"
 464             if fn_line.group(2) != "free" and fn_line.group(2) != "clone" and fn_line.group(2) != "eq" and not is_log:
 465                 dummy_line = fn_line.group(1) + struct_name + "_call_" + fn_line.group(2) + " " + struct_name + "* arg" + fn_line.group(4) + "\n"
 466                 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")
 467
 468     out_java.write("""package org.ldk.impl;
 469
 470 public class bindings {
 471         static {
 472                 System.loadLibrary(\"lightningjni\");
 473                 init(java.lang.Enum.class);
 474         }
 475 """)
 476     out_c.write("""#include \"org_ldk_impl_bindings.h\"
 477 #include <rust_types.h>
 478 #include <lightning.h>
 479 #include <assert.h>
 480 #include <string.h>
 481 #include <stdatomic.h>
 482 """)
 483
 484     if sys.argv[4] == "false":
 485         out_c.write("#define MALLOC(a, _) malloc(a)\n")
 486         out_c.write("#define FREE free\n")
 487     else:
 488         out_c.write("""
 489 #include <threads.h>
 490 static mtx_t allocation_mtx;
 491
 492 void __attribute__((constructor)) init_mtx() {
 493         assert(mtx_init(&allocation_mtx, mtx_plain) == thrd_success);
 494 }
 495
 496 typedef struct allocation {
 497         struct allocation* next;
 498         void* ptr;
 499         const char* struct_name;
 500 } allocation;
 501 static allocation* allocation_ll = NULL;
 502
 503 void* MALLOC(size_t len, const char* struct_name) {
 504         void* res = malloc(len);
 505         allocation* new_alloc = malloc(sizeof(allocation));
 506         new_alloc->ptr = res;
 507         new_alloc->struct_name = struct_name;
 508         assert(mtx_lock(&allocation_mtx) == thrd_success);
 509         new_alloc->next = allocation_ll;
 510         allocation_ll = new_alloc;
 511         assert(mtx_unlock(&allocation_mtx) == thrd_success);
 512         return res;
 513 }
 514
 515 void FREE(void* ptr) {
 516         allocation* p = NULL;
 517         assert(mtx_lock(&allocation_mtx) == thrd_success);
 518         allocation* it = allocation_ll;
 519         while (it->ptr != ptr) { p = it; it = it->next; }
 520         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
 521         assert(mtx_unlock(&allocation_mtx) == thrd_success);
 522         assert(it->ptr == ptr);
 523         free(it);
 524         free(ptr);
 525 }
 526
 527 void __attribute__((destructor)) check_leaks() {
 528         for (allocation* a = allocation_ll; a != NULL; a = a->next) { fprintf(stderr, "%s %p remains\\n", a->struct_name, a->ptr); }
 529         assert(allocation_ll == NULL);
 530 }
 531 """)
 532
 533     out_java.write("""
 534         static native void init(java.lang.Class c);
 535
 536         public static native boolean deref_bool(long ptr);
 537         public static native long deref_long(long ptr);
 538         public static native void free_heap_ptr(long ptr);
 539         public static native long u8_vec_len(long vec);
 540
 541 """)
 542     out_c.write("""
 543 jmethodID ordinal_meth = NULL;
 544 JNIEXPORT void Java_org_ldk_impl_bindings_init(JNIEnv * env, jclass _b, jclass enum_class) {
 545         ordinal_meth = (*env)->GetMethodID(env, enum_class, "ordinal", "()I");
 546         assert(ordinal_meth != NULL);
 547 }
 548
 549 JNIEXPORT jboolean JNICALL Java_org_ldk_impl_bindings_deref_1bool (JNIEnv * env, jclass _a, jlong ptr) {
 550         return *((bool*)ptr);
 551 }
 552 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_deref_1long (JNIEnv * env, jclass _a, jlong ptr) {
 553         return *((long*)ptr);
 554 }
 555 JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_free_1heap_1ptr (JNIEnv * env, jclass _a, jlong ptr) {
 556         FREE((void*)ptr);
 557 }
 558 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_u8_1vec_1len (JNIEnv * env, jclass _a, jlong ptr) {
 559         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)ptr;
 560         return (long)vec->datalen;
 561 }
 562
 563 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
 564 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
 565 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
 566 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
 567
 568 """)
 569
 570     # XXX: Temporarily write out a manual SecretKey_new() for testing, we should auto-gen this kind of thing
 571     out_java.write("\tpublic static native long LDKSecretKey_new();\n\n") # TODO: rm me
 572     out_c.write("JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_LDKSecretKey_1new(JNIEnv * _env, jclass _b) {\n") # TODO: rm me
 573     out_c.write("\tLDKSecretKey* key = (LDKSecretKey*)MALLOC(sizeof(LDKSecretKey), \"LDKSecretKey\");\n") # TODO: rm me
 574     out_c.write("\treturn (long)key;\n") # TODO: rm me
 575     out_c.write("}\n") # TODO: rm me
 576
 577     in_block_comment = False
 578     cur_block_obj = None
 579
 580     fn_ptr_regex = re.compile("^extern const ([A-Za-z_0-9\* ]*) \(\*(.*)\)\((.*)\);$")
 581     fn_ret_arr_regex = re.compile("(.*) \(\*(.*)\((.*)\)\)\[([0-9]*)\];$")
 582     reg_fn_regex = re.compile("([A-Za-z_0-9\* ]* \*?)([a-zA-Z_0-9]*)\((.*)\);$")
 583     const_val_regex = re.compile("^extern const ([A-Za-z_0-9]*) ([A-Za-z_0-9]*);$")
 584
 585     line_indicates_result_regex = re.compile("^   bool result_ok;$")
 586     line_indicates_opaque_regex = re.compile("^   bool is_owned;$")
 587     line_indicates_trait_regex = re.compile("^   ([A-Za-z_0-9]* \*?)\(\*([A-Za-z_0-9]*)\)\((const )?void \*this_arg(.*)\);$")
 588     assert(line_indicates_trait_regex.match("   uintptr_t (*send_data)(void *this_arg, LDKu8slice data, bool resume_read);"))
 589     assert(line_indicates_trait_regex.match("   LDKCVec_MessageSendEventZ (*get_and_clear_pending_msg_events)(const void *this_arg);"))
 590     assert(line_indicates_trait_regex.match("   void *(*clone)(const void *this_arg);"))
 591     line_field_var_regex = re.compile("^   ([A-Za-z_0-9]*) ([A-Za-z_0-9]*);$")
 592     assert(line_field_var_regex.match("   LDKMessageSendEventsProvider MessageSendEventsProvider;"))
 593     struct_name_regex = re.compile("^typedef (struct|enum|union) (MUST_USE_STRUCT )?(LDK[A-Za-z_0-9]*) {$")
 594     assert(struct_name_regex.match("typedef struct LDKCVecTempl_u8 {"))
 595     assert(struct_name_regex.match("typedef enum LDKNetwork {"))
 596     struct_alias_regex = re.compile("^typedef (LDK[A-Za-z_0-9]*) (LDK[A-Za-z_0-9]*);$")
 597     assert(struct_alias_regex.match("typedef LDKCResultTempl_bool__PeerHandleError LDKCResult_boolPeerHandleErrorZ;"))
 598
 599     result_templ_structs = set()
 600     for line in in_h:
 601         if in_block_comment:
 602             #out_java.write("\t" + line)
 603             if line.endswith("*/\n"):
 604                 in_block_comment = False
 605         elif cur_block_obj is not None:
 606             cur_block_obj  = cur_block_obj + line
 607             if line.startswith("} "):
 608                 field_lines = []
 609                 struct_name = None
 610                 obj_lines = cur_block_obj.split("\n")
 611                 is_opaque = False
 612                 is_result = False
 613                 is_unitary_enum = False
 614                 is_union_enum = False
 615                 is_union = False
 616                 trait_fn_lines = []
 617                 field_var_lines = []
 618
 619                 for idx, struct_line in enumerate(obj_lines):
 620                     if struct_line.strip().startswith("/*"):
 621                         in_block_comment = True
 622                     if in_block_comment:
 623                         if struct_line.endswith("*/"):
 624                             in_block_comment = False
 625                     else:
 626                         struct_name_match = struct_name_regex.match(struct_line)
 627                         if struct_name_match is not None:
 628                             struct_name = struct_name_match.group(3)
 629                             if struct_name_match.group(1) == "enum":
 630                                 if not struct_name.endswith("_Tag"):
 631                                     is_unitary_enum = True
 632                                 else:
 633                                     is_union_enum = True
 634                             elif struct_name_match.group(1) == "union":
 635                                 is_union = True
 636                         if line_indicates_opaque_regex.match(struct_line):
 637                             is_opaque = True
 638                         elif line_indicates_result_regex.match(struct_line):
 639                             is_result = True
 640                         trait_fn_match = line_indicates_trait_regex.match(struct_line)
 641                         if trait_fn_match is not None:
 642                             trait_fn_lines.append(trait_fn_match)
 643                         field_var_match = line_field_var_regex.match(struct_line)
 644                         if field_var_match is not None:
 645                             field_var_lines.append(field_var_match)
 646                         field_lines.append(struct_line)
 647
 648                 assert(struct_name is not None)
 649                 assert(len(trait_fn_lines) == 0 or not (is_opaque or is_unitary_enum or is_union_enum or is_union))
 650                 assert(not is_opaque or not (len(trait_fn_lines) != 0 or is_unitary_enum or is_union_enum or is_union))
 651                 assert(not is_unitary_enum or not (len(trait_fn_lines) != 0 or is_opaque or is_union_enum or is_union))
 652                 assert(not is_union_enum or not (len(trait_fn_lines) != 0 or is_unitary_enum or is_opaque or is_union))
 653                 assert(not is_union or not (len(trait_fn_lines) != 0 or is_unitary_enum or is_union_enum or is_opaque))
 654                 if is_opaque:
 655                     opaque_structs.add(struct_name)
 656                 elif is_result:
 657                     result_templ_structs.add(struct_name)
 658                 elif is_unitary_enum:
 659                     unitary_enums.add(struct_name)
 660                     out_c.write("static inline " + struct_name + " " + struct_name + "_from_java(JNIEnv *env, jclass val) {\n")
 661                     out_c.write("\tswitch ((*env)->CallIntMethod(env, val, ordinal_meth)) {\n")
 662                     ord_v = 0
 663                     for idx, struct_line in enumerate(field_lines):
 664                         if idx == 0:
 665                             out_java.write("\tpublic enum " + struct_name + " {\n")
 666                         elif idx == len(field_lines) - 3:
 667                             assert(struct_line.endswith("_Sentinel,"))
 668                         elif idx == len(field_lines) - 2:
 669                             out_java.write("\t}\n")
 670                         elif idx == len(field_lines) - 1:
 671                             assert(struct_line == "")
 672                         else:
 673                             out_java.write("\t" + struct_line + "\n")
 674                             out_c.write("\t\tcase %d: return %s;\n" % (ord_v, struct_line.strip().strip(",")))
 675                             ord_v = ord_v + 1
 676                     out_c.write("\t}\n")
 677                     out_c.write("\tassert(false);\n")
 678                     out_c.write("}\n")
 679
 680                     ord_v = 0
 681                     out_c.write("static inline jclass " + struct_name + "_to_java(JNIEnv *env, " + struct_name + " val) {\n")
 682                     out_c.write("\t// TODO: This is pretty inefficient, we really need to cache the field IDs and class\n")
 683                     out_c.write("\tjclass enum_class = (*env)->FindClass(env, \"Lorg/ldk/impl/bindings$" + struct_name + ";\");\n")
 684                     out_c.write("\tassert(enum_class != NULL);\n")
 685                     out_c.write("\tswitch (val) {\n")
 686                     for idx, struct_line in enumerate(field_lines):
 687                         if idx > 0 and idx < len(field_lines) - 3:
 688                             variant = struct_line.strip().strip(",")
 689                             out_c.write("\t\tcase " + variant + ": {\n")
 690                             out_c.write("\t\t\tjfieldID field = (*env)->GetStaticFieldID(env, enum_class, \"" + variant + "\", \"Lorg/ldk/impl/bindings$" + struct_name + ";\");\n")
 691                             out_c.write("\t\t\tassert(field != NULL);\n")
 692                             out_c.write("\t\t\treturn (*env)->GetStaticObjectField(env, enum_class, field);\n")
 693                             out_c.write("\t\t}\n")
 694                             ord_v = ord_v + 1
 695                     out_c.write("\t\tdefault: assert(false);\n")
 696                     out_c.write("\t}\n")
 697                     out_c.write("}\n\n")
 698                 elif len(trait_fn_lines) > 0:
 699                     trait_structs.add(struct_name)
 700                     map_trait(struct_name, field_var_lines, trait_fn_lines)
 701                 cur_block_obj = None
 702         else:
 703             fn_ptr = fn_ptr_regex.match(line)
 704             fn_ret_arr = fn_ret_arr_regex.match(line)
 705             reg_fn = reg_fn_regex.match(line)
 706             const_val = const_val_regex.match(line)
 707
 708             if line.startswith("#include <"):
 709                 pass
 710             elif line.startswith("/*"):
 711                 #out_java.write("\t" + line)
 712                 if not line.endswith("*/\n"):
 713                     in_block_comment = True
 714             elif line.startswith("typedef enum "):
 715                 cur_block_obj = line
 716             elif line.startswith("typedef struct "):
 717                 cur_block_obj = line
 718             elif line.startswith("typedef union "):
 719                 cur_block_obj = line
 720             elif line.startswith("typedef "):
 721                 alias_match =  struct_alias_regex.match(line)
 722                 if alias_match.group(1) in result_templ_structs:
 723                     out_java.write("\tpublic static native boolean " + alias_match.group(2) + "_result_ok(long arg);\n")
 724                     out_java.write("\tpublic static native long " + alias_match.group(2) + "_get_inner(long arg);\n")
 725                     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")
 726                     out_c.write("\treturn ((" + alias_match.group(2) + "*)arg)->result_ok;\n")
 727                     out_c.write("}\n")
 728                     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")
 729                     out_c.write("\tif (((" + alias_match.group(2) + "*)arg)->result_ok) {\n")
 730                     out_c.write("\t\treturn (long)((" + alias_match.group(2) + "*)arg)->contents.result;\n")
 731                     out_c.write("\t} else {\n")
 732                     out_c.write("\t\treturn (long)((" + alias_match.group(2) + "*)arg)->contents.err;\n")
 733                     out_c.write("\t}\n}\n")
 734                 pass
 735             elif fn_ptr is not None:
 736                 map_fn(line, fn_ptr, None, None)
 737             elif fn_ret_arr is not None:
 738                 map_fn(line, fn_ret_arr, fn_ret_arr.group(4), None)
 739             elif reg_fn is not None:
 740                 map_fn(line, reg_fn, None, None)
 741             elif const_val_regex is not None:
 742                 # TODO Map const variables
 743                 pass
 744             else:
 745                 assert(line == "\n")
 746
 747     out_java.write("}\n")