_ 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 = ("CANT PASS TRAIT TO Java?", ""), ret_conv_name = "NO CONV POSSIBLE")
 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 = ("long " + ty_info.var_name + "_ref = (long)&", ";"), ret_conv_name = ty_info.var_name + "_ref")
 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 = ("long " + ty_info.var_name + "_ref = (long)&", ";"), ret_conv_name = ty_info.var_name + "_ref")
 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) # its a pointer, no conv needed
 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 = ", ";\nDO_ASSERT(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("\tJavaVM *vm;\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                 out_c.write("\tJNIEnv *env;\n")
 361                 out_c.write("\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_8) == JNI_OK);\n")
 362
 363                 for arg_info in arg_names:
 364                     if arg_info.ret_conv is not None:
 365                         out_c.write("\t" + arg_info.ret_conv[0].replace('\n', '\n\t').replace("_env", "env"));
 366                         out_c.write(arg_info.arg_name)
 367                         out_c.write(arg_info.ret_conv[1].replace('\n', '\n\t').replace("_env", "env") + "\n")
 368
 369                 if not ret_ty_info.passed_as_ptr:
 370                     out_c.write("\treturn (*env)->Call" + ret_ty_info.java_ty.title() + "Method(env, j_calls->o, j_calls->" + fn_line.group(2) + "_meth")
 371                 else:
 372                     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");
 373
 374                 for arg_info in arg_names:
 375                     if arg_info.ret_conv is not None:
 376                         out_c.write(", " + arg_info.ret_conv_name)
 377                     else:
 378                         out_c.write(", " + arg_info.arg_name)
 379                 out_c.write(");\n");
 380
 381                 if ret_ty_info.passed_as_ptr:
 382                     out_c.write("\t" + fn_line.group(1).strip() + " res = *ret;\n")
 383                     out_c.write("\tFREE(ret);\n")
 384                     out_c.write("\treturn res;\n")
 385                 out_c.write("}\n")
 386             elif fn_line.group(2) == "free":
 387                 out_c.write("static void " + struct_name + "_JCalls_free(void* this_arg) {\n")
 388                 out_c.write("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
 389                 out_c.write("\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n")
 390                 out_c.write("\t\tJNIEnv *env;\n")
 391                 out_c.write("\t\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_8) == JNI_OK);\n")
 392                 out_c.write("\t\t(*env)->DeleteGlobalRef(env, j_calls->o);\n")
 393                 out_c.write("\t\tFREE(j_calls);\n")
 394                 out_c.write("\t}\n}\n")
 395
 396         # Write out a clone function whether we need one or not, as we use them in moving to rust
 397         out_c.write("static void* " + struct_name + "_JCalls_clone(const void* this_arg) {\n")
 398         out_c.write("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
 399         out_c.write("\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n")
 400         for var_line in field_var_lines:
 401             if var_line.group(1) in trait_structs:
 402                 out_c.write("\tatomic_fetch_add_explicit(&j_calls->" + var_line.group(2) + "->refcnt, 1, memory_order_release);\n")
 403         out_c.write("\treturn (void*) this_arg;\n")
 404         out_c.write("}\n")
 405
 406         out_java.write("\t}\n")
 407
 408         out_java.write("\tpublic static native long " + struct_name + "_new(" + struct_name + " impl")
 409         out_c.write("static inline " + struct_name + " " + struct_name + "_init (JNIEnv * env, jclass _a, jobject o")
 410         for var_line in field_var_lines:
 411             if var_line.group(1) in trait_structs:
 412                 out_java.write(", " + var_line.group(1) + " " + var_line.group(2))
 413                 out_c.write(", jobject " + var_line.group(2))
 414         out_java.write(");\n")
 415         out_c.write(") {\n")
 416
 417         out_c.write("\tjclass c = (*env)->GetObjectClass(env, o);\n")
 418         out_c.write("\tDO_ASSERT(c != NULL);\n")
 419         out_c.write("\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n")
 420         out_c.write("\tatomic_init(&calls->refcnt, 1);\n")
 421         out_c.write("\tDO_ASSERT((*env)->GetJavaVM(env, &calls->vm) == 0);\n")
 422         out_c.write("\tcalls->o = (*env)->NewGlobalRef(env, o);\n")
 423         for (fn_line, java_meth_descr) in zip(trait_fn_lines, java_meths):
 424             if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
 425                 out_c.write("\tcalls->" + fn_line.group(2) + "_meth = (*env)->GetMethodID(env, c, \"" + fn_line.group(2) + "\", \"" + java_meth_descr + "\");\n")
 426                 out_c.write("\tDO_ASSERT(calls->" + fn_line.group(2) + "_meth != NULL);\n")
 427         out_c.write("\n\t" + struct_name + " ret = {\n")
 428         out_c.write("\t\t.this_arg = (void*) calls,\n")
 429         for fn_line in trait_fn_lines:
 430             if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
 431                 out_c.write("\t\t." + fn_line.group(2) + " = " + fn_line.group(2) + "_jcall,\n")
 432             elif fn_line.group(2) == "free":
 433                 out_c.write("\t\t.free = " + struct_name + "_JCalls_free,\n")
 434             else:
 435                 out_c.write("\t\t.clone = " + struct_name + "_JCalls_clone,\n")
 436         for var_line in field_var_lines:
 437             if var_line.group(1) in trait_structs:
 438                 out_c.write("\t\t." + var_line.group(2) + " = " + var_line.group(1) + "_init(env, _a, " + var_line.group(2) + "),\n")
 439         out_c.write("\t};\n")
 440         for var_line in field_var_lines:
 441             if var_line.group(1) in trait_structs:
 442                 out_c.write("\tcalls->" + var_line.group(2) + " = ret." + var_line.group(2) + ".this_arg;\n")
 443         out_c.write("\treturn ret;\n")
 444         out_c.write("}\n")
 445
 446         out_c.write("JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1new (JNIEnv * env, jclass _a, jobject o")
 447         for var_line in field_var_lines:
 448             if var_line.group(1) in trait_structs:
 449                 out_c.write(", jobject " + var_line.group(2))
 450         out_c.write(") {\n")
 451         out_c.write("\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n")
 452         out_c.write("\t*res_ptr = " + struct_name + "_init(env, _a, o")
 453         for var_line in field_var_lines:
 454             if var_line.group(1) in trait_structs:
 455                 out_c.write(", " + var_line.group(2))
 456         out_c.write(");\n")
 457         out_c.write("\treturn (long)res_ptr;\n")
 458         out_c.write("}\n")
 459
 460         out_java.write("\tpublic static native " + struct_name + " " + struct_name + "_get_obj_from_jcalls(long val);\n")
 461         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")
 462         out_c.write("\treturn ((" + struct_name + "_JCalls*)val)->o;\n")
 463         out_c.write("}\n")
 464
 465         for fn_line in trait_fn_lines:
 466             # For now, just disable enabling the _call_log - we don't know how to inverse-map String
 467             is_log = fn_line.group(2) == "log" and struct_name == "LDKLogger"
 468             if fn_line.group(2) != "free" and fn_line.group(2) != "clone" and fn_line.group(2) != "eq" and not is_log:
 469                 dummy_line = fn_line.group(1) + struct_name + "_call_" + fn_line.group(2) + " " + struct_name + "* arg" + fn_line.group(4) + "\n"
 470                 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")
 471
 472     out_java.write("""package org.ldk.impl;
 473
 474 public class bindings {
 475         static {
 476                 System.loadLibrary(\"lightningjni\");
 477                 init(java.lang.Enum.class);
 478         }
 479 """)
 480     out_c.write("""#include \"org_ldk_impl_bindings.h\"
 481 #include <rust_types.h>
 482 #include <lightning.h>
 483 #include <string.h>
 484 #include <stdatomic.h>
 485 """)
 486
 487     if sys.argv[4] == "false":
 488         out_c.write("#define MALLOC(a, _) malloc(a)\n")
 489         out_c.write("#define FREE free\n")
 490         out_c.write("#define DO_ASSERT(a) (void)(a)\n")
 491     else:
 492         out_c.write("""#include <assert.h>
 493 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
 494
 495 #include <threads.h>
 496 static mtx_t allocation_mtx;
 497
 498 void __attribute__((constructor)) init_mtx() {
 499         DO_ASSERT(mtx_init(&allocation_mtx, mtx_plain) == thrd_success);
 500 }
 501
 502 typedef struct allocation {
 503         struct allocation* next;
 504         void* ptr;
 505         const char* struct_name;
 506 } allocation;
 507 static allocation* allocation_ll = NULL;
 508
 509 void* MALLOC(size_t len, const char* struct_name) {
 510         void* res = malloc(len);
 511         allocation* new_alloc = malloc(sizeof(allocation));
 512         new_alloc->ptr = res;
 513         new_alloc->struct_name = struct_name;
 514         DO_ASSERT(mtx_lock(&allocation_mtx) == thrd_success);
 515         new_alloc->next = allocation_ll;
 516         allocation_ll = new_alloc;
 517         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
 518         return res;
 519 }
 520
 521 void FREE(void* ptr) {
 522         allocation* p = NULL;
 523         DO_ASSERT(mtx_lock(&allocation_mtx) == thrd_success);
 524         allocation* it = allocation_ll;
 525         while (it->ptr != ptr) { p = it; it = it->next; }
 526         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
 527         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
 528         DO_ASSERT(it->ptr == ptr);
 529         free(it);
 530         free(ptr);
 531 }
 532
 533 void __attribute__((destructor)) check_leaks() {
 534         for (allocation* a = allocation_ll; a != NULL; a = a->next) { fprintf(stderr, "%s %p remains\\n", a->struct_name, a->ptr); }
 535         DO_ASSERT(allocation_ll == NULL);
 536 }
 537 """)
 538
 539     out_java.write("""
 540         static native void init(java.lang.Class c);
 541
 542         public static native boolean deref_bool(long ptr);
 543         public static native long deref_long(long ptr);
 544         public static native void free_heap_ptr(long ptr);
 545         public static native byte[] get_u8_slice_bytes(long slice_ptr);
 546         public static native long bytes_to_u8_vec(byte[] bytes);
 547         public static native long u8_vec_len(long vec);
 548
 549 """)
 550     out_c.write("""
 551 jmethodID ordinal_meth = NULL;
 552 JNIEXPORT void Java_org_ldk_impl_bindings_init(JNIEnv * env, jclass _b, jclass enum_class) {
 553         ordinal_meth = (*env)->GetMethodID(env, enum_class, "ordinal", "()I");
 554         DO_ASSERT(ordinal_meth != NULL);
 555 }
 556
 557 JNIEXPORT jboolean JNICALL Java_org_ldk_impl_bindings_deref_1bool (JNIEnv * env, jclass _a, jlong ptr) {
 558         return *((bool*)ptr);
 559 }
 560 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_deref_1long (JNIEnv * env, jclass _a, jlong ptr) {
 561         return *((long*)ptr);
 562 }
 563 JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_free_1heap_1ptr (JNIEnv * env, jclass _a, jlong ptr) {
 564         FREE((void*)ptr);
 565 }
 566 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_get_1u8_1slice_1bytes (JNIEnv * _env, jclass _b, jlong slice_ptr) {
 567         LDKu8slice *slice = (LDKu8slice*)slice_ptr;
 568         jbyteArray ret_arr = (*_env)->NewByteArray(_env, slice->datalen);
 569         (*_env)->SetByteArrayRegion(_env, ret_arr, 0, slice->datalen, slice->data);
 570         return ret_arr;
 571 }
 572 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_bytes_1to_1u8_1vec (JNIEnv * _env, jclass _b, jbyteArray bytes) {
 573         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "LDKCVec_u8");
 574         vec->datalen = (*_env)->GetArrayLength(_env, bytes);
 575         vec->data = (uint8_t*)malloc(vec->datalen); // May be freed by rust, so don't track allocation
 576         (*_env)->GetByteArrayRegion (_env, bytes, 0, vec->datalen, vec->data);
 577         return (long)vec;
 578 }
 579 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_u8_1vec_1len (JNIEnv * env, jclass _a, jlong ptr) {
 580         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)ptr;
 581         return (long)vec->datalen;
 582 }
 583
 584 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
 585 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
 586 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
 587 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
 588
 589 """)
 590
 591     # XXX: Temporarily write out a manual SecretKey_new() for testing, we should auto-gen this kind of thing
 592     out_java.write("\tpublic static native long LDKSecretKey_new();\n\n") # TODO: rm me
 593     out_c.write("JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_LDKSecretKey_1new(JNIEnv * _env, jclass _b) {\n") # TODO: rm me
 594     out_c.write("\tLDKSecretKey* key = (LDKSecretKey*)MALLOC(sizeof(LDKSecretKey), \"LDKSecretKey\");\n") # TODO: rm me
 595     out_c.write("\treturn (long)key;\n") # TODO: rm me
 596     out_c.write("}\n") # TODO: rm me
 597
 598     in_block_comment = False
 599     cur_block_obj = None
 600
 601     fn_ptr_regex = re.compile("^extern const ([A-Za-z_0-9\* ]*) \(\*(.*)\)\((.*)\);$")
 602     fn_ret_arr_regex = re.compile("(.*) \(\*(.*)\((.*)\)\)\[([0-9]*)\];$")
 603     reg_fn_regex = re.compile("([A-Za-z_0-9\* ]* \*?)([a-zA-Z_0-9]*)\((.*)\);$")
 604     const_val_regex = re.compile("^extern const ([A-Za-z_0-9]*) ([A-Za-z_0-9]*);$")
 605
 606     line_indicates_result_regex = re.compile("^   bool result_ok;$")
 607     line_indicates_opaque_regex = re.compile("^   bool is_owned;$")
 608     line_indicates_trait_regex = re.compile("^   ([A-Za-z_0-9]* \*?)\(\*([A-Za-z_0-9]*)\)\((const )?void \*this_arg(.*)\);$")
 609     assert(line_indicates_trait_regex.match("   uintptr_t (*send_data)(void *this_arg, LDKu8slice data, bool resume_read);"))
 610     assert(line_indicates_trait_regex.match("   LDKCVec_MessageSendEventZ (*get_and_clear_pending_msg_events)(const void *this_arg);"))
 611     assert(line_indicates_trait_regex.match("   void *(*clone)(const void *this_arg);"))
 612     line_field_var_regex = re.compile("^   ([A-Za-z_0-9]*) ([A-Za-z_0-9]*);$")
 613     assert(line_field_var_regex.match("   LDKMessageSendEventsProvider MessageSendEventsProvider;"))
 614     struct_name_regex = re.compile("^typedef (struct|enum|union) (MUST_USE_STRUCT )?(LDK[A-Za-z_0-9]*) {$")
 615     assert(struct_name_regex.match("typedef struct LDKCVecTempl_u8 {"))
 616     assert(struct_name_regex.match("typedef enum LDKNetwork {"))
 617     struct_alias_regex = re.compile("^typedef (LDK[A-Za-z_0-9]*) (LDK[A-Za-z_0-9]*);$")
 618     assert(struct_alias_regex.match("typedef LDKCResultTempl_bool__PeerHandleError LDKCResult_boolPeerHandleErrorZ;"))
 619
 620     result_templ_structs = set()
 621     for line in in_h:
 622         if in_block_comment:
 623             #out_java.write("\t" + line)
 624             if line.endswith("*/\n"):
 625                 in_block_comment = False
 626         elif cur_block_obj is not None:
 627             cur_block_obj  = cur_block_obj + line
 628             if line.startswith("} "):
 629                 field_lines = []
 630                 struct_name = None
 631                 obj_lines = cur_block_obj.split("\n")
 632                 is_opaque = False
 633                 is_result = False
 634                 is_unitary_enum = False
 635                 is_union_enum = False
 636                 is_union = False
 637                 trait_fn_lines = []
 638                 field_var_lines = []
 639
 640                 for idx, struct_line in enumerate(obj_lines):
 641                     if struct_line.strip().startswith("/*"):
 642                         in_block_comment = True
 643                     if in_block_comment:
 644                         if struct_line.endswith("*/"):
 645                             in_block_comment = False
 646                     else:
 647                         struct_name_match = struct_name_regex.match(struct_line)
 648                         if struct_name_match is not None:
 649                             struct_name = struct_name_match.group(3)
 650                             if struct_name_match.group(1) == "enum":
 651                                 if not struct_name.endswith("_Tag"):
 652                                     is_unitary_enum = True
 653                                 else:
 654                                     is_union_enum = True
 655                             elif struct_name_match.group(1) == "union":
 656                                 is_union = True
 657                         if line_indicates_opaque_regex.match(struct_line):
 658                             is_opaque = True
 659                         elif line_indicates_result_regex.match(struct_line):
 660                             is_result = True
 661                         trait_fn_match = line_indicates_trait_regex.match(struct_line)
 662                         if trait_fn_match is not None:
 663                             trait_fn_lines.append(trait_fn_match)
 664                         field_var_match = line_field_var_regex.match(struct_line)
 665                         if field_var_match is not None:
 666                             field_var_lines.append(field_var_match)
 667                         field_lines.append(struct_line)
 668
 669                 assert(struct_name is not None)
 670                 assert(len(trait_fn_lines) == 0 or not (is_opaque or is_unitary_enum or is_union_enum or is_union))
 671                 assert(not is_opaque or not (len(trait_fn_lines) != 0 or is_unitary_enum or is_union_enum or is_union))
 672                 assert(not is_unitary_enum or not (len(trait_fn_lines) != 0 or is_opaque or is_union_enum or is_union))
 673                 assert(not is_union_enum or not (len(trait_fn_lines) != 0 or is_unitary_enum or is_opaque or is_union))
 674                 assert(not is_union or not (len(trait_fn_lines) != 0 or is_unitary_enum or is_union_enum or is_opaque))
 675                 if is_opaque:
 676                     opaque_structs.add(struct_name)
 677                 elif is_result:
 678                     result_templ_structs.add(struct_name)
 679                 elif is_unitary_enum:
 680                     unitary_enums.add(struct_name)
 681                     out_c.write("static inline " + struct_name + " " + struct_name + "_from_java(JNIEnv *env, jclass val) {\n")
 682                     out_c.write("\tswitch ((*env)->CallIntMethod(env, val, ordinal_meth)) {\n")
 683                     ord_v = 0
 684                     for idx, struct_line in enumerate(field_lines):
 685                         if idx == 0:
 686                             out_java.write("\tpublic enum " + struct_name + " {\n")
 687                         elif idx == len(field_lines) - 3:
 688                             assert(struct_line.endswith("_Sentinel,"))
 689                         elif idx == len(field_lines) - 2:
 690                             out_java.write("\t}\n")
 691                         elif idx == len(field_lines) - 1:
 692                             assert(struct_line == "")
 693                         else:
 694                             out_java.write("\t" + struct_line + "\n")
 695                             out_c.write("\t\tcase %d: return %s;\n" % (ord_v, struct_line.strip().strip(",")))
 696                             ord_v = ord_v + 1
 697                     out_c.write("\t}\n")
 698                     out_c.write("\tabort();\n")
 699                     out_c.write("}\n")
 700
 701                     ord_v = 0
 702                     out_c.write("static inline jclass " + struct_name + "_to_java(JNIEnv *env, " + struct_name + " val) {\n")
 703                     out_c.write("\t// TODO: This is pretty inefficient, we really need to cache the field IDs and class\n")
 704                     out_c.write("\tjclass enum_class = (*env)->FindClass(env, \"Lorg/ldk/impl/bindings$" + struct_name + ";\");\n")
 705                     out_c.write("\tDO_ASSERT(enum_class != NULL);\n")
 706                     out_c.write("\tswitch (val) {\n")
 707                     for idx, struct_line in enumerate(field_lines):
 708                         if idx > 0 and idx < len(field_lines) - 3:
 709                             variant = struct_line.strip().strip(",")
 710                             out_c.write("\t\tcase " + variant + ": {\n")
 711                             out_c.write("\t\t\tjfieldID field = (*env)->GetStaticFieldID(env, enum_class, \"" + variant + "\", \"Lorg/ldk/impl/bindings$" + struct_name + ";\");\n")
 712                             out_c.write("\t\t\tDO_ASSERT(field != NULL);\n")
 713                             out_c.write("\t\t\treturn (*env)->GetStaticObjectField(env, enum_class, field);\n")
 714                             out_c.write("\t\t}\n")
 715                             ord_v = ord_v + 1
 716                     out_c.write("\t\tdefault: abort();\n")
 717                     out_c.write("\t}\n")
 718                     out_c.write("}\n\n")
 719                 elif len(trait_fn_lines) > 0:
 720                     trait_structs.add(struct_name)
 721                     map_trait(struct_name, field_var_lines, trait_fn_lines)
 722                 cur_block_obj = None
 723         else:
 724             fn_ptr = fn_ptr_regex.match(line)
 725             fn_ret_arr = fn_ret_arr_regex.match(line)
 726             reg_fn = reg_fn_regex.match(line)
 727             const_val = const_val_regex.match(line)
 728
 729             if line.startswith("#include <"):
 730                 pass
 731             elif line.startswith("/*"):
 732                 #out_java.write("\t" + line)
 733                 if not line.endswith("*/\n"):
 734                     in_block_comment = True
 735             elif line.startswith("typedef enum "):
 736                 cur_block_obj = line
 737             elif line.startswith("typedef struct "):
 738                 cur_block_obj = line
 739             elif line.startswith("typedef union "):
 740                 cur_block_obj = line
 741             elif line.startswith("typedef "):
 742                 alias_match =  struct_alias_regex.match(line)
 743                 if alias_match.group(1) in result_templ_structs:
 744                     out_java.write("\tpublic static native boolean " + alias_match.group(2) + "_result_ok(long arg);\n")
 745                     out_java.write("\tpublic static native long " + alias_match.group(2) + "_get_inner(long arg);\n")
 746                     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")
 747                     out_c.write("\treturn ((" + alias_match.group(2) + "*)arg)->result_ok;\n")
 748                     out_c.write("}\n")
 749                     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")
 750                     out_c.write("\tif (((" + alias_match.group(2) + "*)arg)->result_ok) {\n")
 751                     out_c.write("\t\treturn (long)((" + alias_match.group(2) + "*)arg)->contents.result;\n")
 752                     out_c.write("\t} else {\n")
 753                     out_c.write("\t\treturn (long)((" + alias_match.group(2) + "*)arg)->contents.err;\n")
 754                     out_c.write("\t}\n}\n")
 755                 pass
 756             elif fn_ptr is not None:
 757                 map_fn(line, fn_ptr, None, None)
 758             elif fn_ret_arr is not None:
 759                 map_fn(line, fn_ret_arr, fn_ret_arr.group(4), None)
 760             elif reg_fn is not None:
 761                 map_fn(line, reg_fn, None, None)
 762             elif const_val_regex is not None:
 763                 # TODO Map const variables
 764                 pass
 765             else:
 766                 assert(line == "\n")
 767
 768     out_java.write("}\n")