_ 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/ /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 hu_struct_file_prefix = """package org.ldk.structs;
  10
  11 import org.ldk.impl.bindings;
  12 import org.ldk.enums.*;
  13 import org.ldk.util.*;
  14 import java.util.Arrays;
  15
  16 @SuppressWarnings("unchecked") // We correctly assign various generic arrays
  17 """
  18
  19 c_file_pfx = """#include \"org_ldk_impl_bindings.h\"
  20 #include <rust_types.h>
  21 #include <lightning.h>
  22 #include <string.h>
  23 #include <stdatomic.h>
  24 """
  25
  26 if sys.argv[5] == "false":
  27     c_file_pfx = c_file_pfx + """#define MALLOC(a, _) malloc(a)
  28 #define FREE(p) if ((long)(p) > 1024) { free(p); }
  29 #define DO_ASSERT(a) (void)(a)
  30 #define CHECK(a)
  31 """
  32 else:
  33     c_file_pfx = c_file_pfx + """#include <assert.h>
  34 // Always run a, then assert it is true:
  35 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
  36 // Assert a is true or do nothing
  37 #define CHECK(a) DO_ASSERT(a)
  38
  39 // Running a leak check across all the allocations and frees of the JDK is a mess,
  40 // so instead we implement our own naive leak checker here, relying on the -wrap
  41 // linker option to wrap malloc/calloc/realloc/free, tracking everyhing allocated
  42 // and free'd in Rust or C across the generated bindings shared library.
  43 #include <threads.h>
  44 #include <execinfo.h>
  45 #include <unistd.h>
  46 static mtx_t allocation_mtx;
  47
  48 void __attribute__((constructor)) init_mtx() {
  49         DO_ASSERT(mtx_init(&allocation_mtx, mtx_plain) == thrd_success);
  50 }
  51
  52 #define BT_MAX 128
  53 typedef struct allocation {
  54         struct allocation* next;
  55         void* ptr;
  56         const char* struct_name;
  57         void* bt[BT_MAX];
  58         int bt_len;
  59 } allocation;
  60 static allocation* allocation_ll = NULL;
  61
  62 void* __real_malloc(size_t len);
  63 void* __real_calloc(size_t nmemb, size_t len);
  64 static void new_allocation(void* res, const char* struct_name) {
  65         allocation* new_alloc = __real_malloc(sizeof(allocation));
  66         new_alloc->ptr = res;
  67         new_alloc->struct_name = struct_name;
  68         new_alloc->bt_len = backtrace(new_alloc->bt, BT_MAX);
  69         DO_ASSERT(mtx_lock(&allocation_mtx) == thrd_success);
  70         new_alloc->next = allocation_ll;
  71         allocation_ll = new_alloc;
  72         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
  73 }
  74 static void* MALLOC(size_t len, const char* struct_name) {
  75         void* res = __real_malloc(len);
  76         new_allocation(res, struct_name);
  77         return res;
  78 }
  79 void __real_free(void* ptr);
  80 static void alloc_freed(void* ptr) {
  81         allocation* p = NULL;
  82         DO_ASSERT(mtx_lock(&allocation_mtx) == thrd_success);
  83         allocation* it = allocation_ll;
  84         while (it->ptr != ptr) {
  85                 p = it; it = it->next;
  86                 if (it == NULL) {
  87                         fprintf(stderr, "Tried to free unknown pointer %p at:\\n", ptr);
  88                         void* bt[BT_MAX];
  89                         int bt_len = backtrace(bt, BT_MAX);
  90                         backtrace_symbols_fd(bt, bt_len, STDERR_FILENO);
  91                         fprintf(stderr, "\\n\\n");
  92                         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
  93                         return; // addrsan should catch malloc-unknown and print more info than we have
  94                 }
  95         }
  96         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
  97         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
  98         DO_ASSERT(it->ptr == ptr);
  99         __real_free(it);
 100 }
 101 static void FREE(void* ptr) {
 102         if ((long)ptr < 1024) return; // Rust loves to create pointers to the NULL page for dummys
 103         alloc_freed(ptr);
 104         __real_free(ptr);
 105 }
 106
 107 void* __wrap_malloc(size_t len) {
 108         void* res = __real_malloc(len);
 109         new_allocation(res, "malloc call");
 110         return res;
 111 }
 112 void* __wrap_calloc(size_t nmemb, size_t len) {
 113         void* res = __real_calloc(nmemb, len);
 114         new_allocation(res, "calloc call");
 115         return res;
 116 }
 117 void __wrap_free(void* ptr) {
 118         if (ptr == NULL) return;
 119         alloc_freed(ptr);
 120         __real_free(ptr);
 121 }
 122
 123 void* __real_realloc(void* ptr, size_t newlen);
 124 void* __wrap_realloc(void* ptr, size_t len) {
 125         if (ptr != NULL) alloc_freed(ptr);
 126         void* res = __real_realloc(ptr, len);
 127         new_allocation(res, "realloc call");
 128         return res;
 129 }
 130 void __wrap_reallocarray(void* ptr, size_t new_sz) {
 131         // Rust doesn't seem to use reallocarray currently
 132         assert(false);
 133 }
 134
 135 void __attribute__((destructor)) check_leaks() {
 136         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 137                 fprintf(stderr, "%s %p remains:\\n", a->struct_name, a->ptr);
 138                 backtrace_symbols_fd(a->bt, a->bt_len, STDERR_FILENO);
 139                 fprintf(stderr, "\\n\\n");
 140         }
 141         DO_ASSERT(allocation_ll == NULL);
 142 }
 143 """
 144
 145 c_file = ""
 146 def write_c(s):
 147     global c_file
 148     c_file += s
 149
 150 class TypeInfo:
 151     def __init__(self, is_native_primitive, rust_obj, java_ty, java_fn_ty_arg, java_hu_ty, c_ty, passed_as_ptr, is_ptr, var_name, arr_len, arr_access, subty=None):
 152         self.is_native_primitive = is_native_primitive
 153         self.rust_obj = rust_obj
 154         self.java_ty = java_ty
 155         self.java_hu_ty = java_hu_ty
 156         self.java_fn_ty_arg = java_fn_ty_arg
 157         self.c_ty = c_ty
 158         self.passed_as_ptr = passed_as_ptr
 159         self.is_ptr = is_ptr
 160         self.var_name = var_name
 161         self.arr_len = arr_len
 162         self.arr_access = arr_access
 163         self.subty = subty
 164         self.pass_by_ref = is_ptr
 165         self.requires_clone = None
 166
 167 class ConvInfo:
 168     def __init__(self, ty_info, arg_name, arg_conv, arg_conv_name, arg_conv_cleanup, ret_conv, ret_conv_name, to_hu_conv, to_hu_conv_name, from_hu_conv):
 169         assert(ty_info.c_ty is not None)
 170         assert(ty_info.java_ty is not None)
 171         assert(arg_name is not None)
 172         self.passed_as_ptr = ty_info.passed_as_ptr
 173         self.rust_obj = ty_info.rust_obj
 174         self.c_ty = ty_info.c_ty
 175         self.java_ty = ty_info.java_ty
 176         self.java_hu_ty = ty_info.java_hu_ty
 177         self.java_fn_ty_arg = ty_info.java_fn_ty_arg
 178         self.arg_name = arg_name
 179         self.arg_conv = arg_conv
 180         self.arg_conv_name = arg_conv_name
 181         self.arg_conv_cleanup = arg_conv_cleanup
 182         self.ret_conv = ret_conv
 183         self.ret_conv_name = ret_conv_name
 184         self.to_hu_conv = to_hu_conv
 185         self.to_hu_conv_name = to_hu_conv_name
 186         self.from_hu_conv = from_hu_conv
 187
 188     def print_ty(self):
 189         write_c(self.c_ty)
 190         out_java.write(self.java_ty)
 191
 192     def print_name(self):
 193         if self.arg_name != "":
 194             out_java.write(" " + self.arg_name)
 195             write_c(" " + self.arg_name)
 196         else:
 197             out_java.write(" arg")
 198             write_c(" arg")
 199
 200 def camel_to_snake(s):
 201     # Convert camel case to snake case, in a way that appears to match cbindgen
 202     con = "_"
 203     ret = ""
 204     lastchar = ""
 205     lastund = False
 206     for char in s:
 207         if lastchar.isupper():
 208             if not char.isupper() and not lastund:
 209                 ret = ret + "_"
 210                 lastund = True
 211             else:
 212                 lastund = False
 213             ret = ret + lastchar.lower()
 214         else:
 215             ret = ret + lastchar
 216             if char.isupper() and not lastund:
 217                 ret = ret + "_"
 218                 lastund = True
 219             else:
 220                 lastund = False
 221         lastchar = char
 222         if char.isnumeric():
 223             lastund = True
 224     return (ret + lastchar.lower()).strip("_")
 225
 226 unitary_enums = set()
 227 complex_enums = set()
 228 opaque_structs = set()
 229 trait_structs = set()
 230 result_types = set()
 231 tuple_types = {}
 232
 233 var_is_arr_regex = re.compile("\(\*([A-za-z0-9_]*)\)\[([a-z0-9]*)\]")
 234 var_ty_regex = re.compile("([A-za-z_0-9]*)(.*)")
 235 java_c_types_none_allowed = True # Unset when we do the real pass that populates the above sets
 236 def java_c_types(fn_arg, ret_arr_len):
 237     fn_arg = fn_arg.strip()
 238     if fn_arg.startswith("MUST_USE_RES "):
 239         fn_arg = fn_arg[13:]
 240     is_const = False
 241     if fn_arg.startswith("const "):
 242         fn_arg = fn_arg[6:]
 243         is_const = True
 244
 245     is_ptr = False
 246     take_by_ptr = False
 247     rust_obj = None
 248     arr_access = None
 249     java_hu_ty = None
 250     if fn_arg.startswith("LDKThirtyTwoBytes"):
 251         fn_arg = "uint8_t (*" + fn_arg[18:] + ")[32]"
 252         assert var_is_arr_regex.match(fn_arg[8:])
 253         rust_obj = "LDKThirtyTwoBytes"
 254         arr_access = "data"
 255     elif fn_arg.startswith("LDKPublicKey"):
 256         fn_arg = "uint8_t (*" + fn_arg[13:] + ")[33]"
 257         assert var_is_arr_regex.match(fn_arg[8:])
 258         rust_obj = "LDKPublicKey"
 259         arr_access = "compressed_form"
 260     elif fn_arg.startswith("LDKSecretKey"):
 261         fn_arg = "uint8_t (*" + fn_arg[13:] + ")[32]"
 262         assert var_is_arr_regex.match(fn_arg[8:])
 263         rust_obj = "LDKSecretKey"
 264         arr_access = "bytes"
 265     elif fn_arg.startswith("LDKSignature"):
 266         fn_arg = "uint8_t (*" + fn_arg[13:] + ")[64]"
 267         assert var_is_arr_regex.match(fn_arg[8:])
 268         rust_obj = "LDKSignature"
 269         arr_access = "compact_form"
 270     elif fn_arg.startswith("LDKThreeBytes"):
 271         fn_arg = "uint8_t (*" + fn_arg[14:] + ")[3]"
 272         assert var_is_arr_regex.match(fn_arg[8:])
 273         rust_obj = "LDKThreeBytes"
 274         arr_access = "data"
 275     elif fn_arg.startswith("LDKFourBytes"):
 276         fn_arg = "uint8_t (*" + fn_arg[13:] + ")[4]"
 277         assert var_is_arr_regex.match(fn_arg[8:])
 278         rust_obj = "LDKFourBytes"
 279         arr_access = "data"
 280     elif fn_arg.startswith("LDKSixteenBytes"):
 281         fn_arg = "uint8_t (*" + fn_arg[16:] + ")[16]"
 282         assert var_is_arr_regex.match(fn_arg[8:])
 283         rust_obj = "LDKSixteenBytes"
 284         arr_access = "data"
 285     elif fn_arg.startswith("LDKTenBytes"):
 286         fn_arg = "uint8_t (*" + fn_arg[12:] + ")[10]"
 287         assert var_is_arr_regex.match(fn_arg[8:])
 288         rust_obj = "LDKTenBytes"
 289         arr_access = "data"
 290     elif fn_arg.startswith("LDKu8slice"):
 291         fn_arg = "uint8_t (*" + fn_arg[11:] + ")[datalen]"
 292         assert var_is_arr_regex.match(fn_arg[8:])
 293         rust_obj = "LDKu8slice"
 294         arr_access = "data"
 295     elif fn_arg.startswith("LDKCVecTempl_u8") or fn_arg.startswith("LDKCVec_u8Z"):
 296         if fn_arg.startswith("LDKCVecTempl_u8"):
 297             fn_arg = "uint8_t (*" + fn_arg[16:] + ")[datalen]"
 298             rust_obj = "LDKCVecTempl_u8"
 299             assert var_is_arr_regex.match(fn_arg[8:])
 300         else:
 301             fn_arg = "uint8_t (*" + fn_arg[12:] + ")[datalen]"
 302             rust_obj = "LDKCVec_u8Z"
 303             assert var_is_arr_regex.match(fn_arg[8:])
 304         arr_access = "data"
 305     elif fn_arg.startswith("LDKTransaction"):
 306         fn_arg = "uint8_t (*" + fn_arg[15:] + ")[datalen]"
 307         rust_obj = "LDKTransaction"
 308         assert var_is_arr_regex.match(fn_arg[8:])
 309         arr_access = "data"
 310     elif fn_arg.startswith("LDKCVecTempl_") or fn_arg.startswith("LDKCVec_"):
 311         is_ptr = False
 312         if "*" in fn_arg:
 313             fn_arg = fn_arg.replace("*", "")
 314             is_ptr = True
 315
 316         if fn_arg.startswith("LDKCVec_"):
 317             tyn = fn_arg[8:].split(" ")
 318             assert tyn[0].endswith("Z")
 319             if tyn[0] == "u64Z":
 320                 new_arg = "uint64_t"
 321             else:
 322                 new_arg = "LDK" + tyn[0][:-1]
 323             for a in tyn[1:]:
 324                 new_arg = new_arg + " " + a
 325             res = java_c_types(new_arg, ret_arr_len)
 326         else:
 327             res = java_c_types("LDK" + fn_arg[13:], ret_arr_len)
 328         if res is None:
 329             assert java_c_types_none_allowed
 330             return None
 331         if is_ptr:
 332             res.pass_by_ref = True
 333         if res.is_native_primitive or res.passed_as_ptr:
 334             return TypeInfo(rust_obj=fn_arg.split(" ")[0], java_ty=res.java_ty + "[]", java_hu_ty=res.java_hu_ty + "[]",
 335                 java_fn_ty_arg="[" + res.java_fn_ty_arg, c_ty=res.c_ty + "Array", passed_as_ptr=False, is_ptr=is_ptr,
 336                 var_name=res.var_name, arr_len="datalen", arr_access="data", subty=res, is_native_primitive=False)
 337         else:
 338             return TypeInfo(rust_obj=fn_arg.split(" ")[0], java_ty=res.java_ty + "[]", java_hu_ty=res.java_hu_ty + "[]",
 339                 java_fn_ty_arg="[" + res.java_fn_ty_arg, c_ty="jobjectArray", passed_as_ptr=False, is_ptr=is_ptr,
 340                 var_name=res.var_name, arr_len="datalen", arr_access="data", subty=res, is_native_primitive=False)
 341
 342     is_primitive = False
 343     arr_len = None
 344     if fn_arg.startswith("void"):
 345         java_ty = "void"
 346         c_ty = "void"
 347         fn_ty_arg = "V"
 348         fn_arg = fn_arg[4:].strip()
 349         is_primitive = True
 350     elif fn_arg.startswith("bool"):
 351         java_ty = "boolean"
 352         c_ty = "jboolean"
 353         fn_ty_arg = "Z"
 354         fn_arg = fn_arg[4:].strip()
 355         is_primitive = True
 356     elif fn_arg.startswith("uint8_t"):
 357         java_ty = "byte"
 358         c_ty = "jbyte"
 359         fn_ty_arg = "B"
 360         fn_arg = fn_arg[7:].strip()
 361         is_primitive = True
 362     elif fn_arg.startswith("uint16_t"):
 363         java_ty = "short"
 364         c_ty = "jshort"
 365         fn_ty_arg = "S"
 366         fn_arg = fn_arg[8:].strip()
 367         is_primitive = True
 368     elif fn_arg.startswith("uint32_t"):
 369         java_ty = "int"
 370         c_ty = "jint"
 371         fn_ty_arg = "I"
 372         fn_arg = fn_arg[8:].strip()
 373         is_primitive = True
 374     elif fn_arg.startswith("uint64_t") or fn_arg.startswith("uintptr_t"):
 375         java_ty = "long"
 376         c_ty = "jlong"
 377         fn_ty_arg = "J"
 378         if fn_arg.startswith("uint64_t"):
 379             fn_arg = fn_arg[8:].strip()
 380         else:
 381             fn_arg = fn_arg[9:].strip()
 382         is_primitive = True
 383     elif is_const and fn_arg.startswith("char *"):
 384         java_ty = "String"
 385         c_ty = "const char*"
 386         fn_ty_arg = "Ljava/lang/String;"
 387         fn_arg = fn_arg[6:].strip()
 388     elif fn_arg.startswith("LDKStr"):
 389         java_ty = "String"
 390         c_ty = "jstring"
 391         fn_ty_arg = "Ljava/lang/String;"
 392         fn_arg = fn_arg[6:].strip()
 393         arr_access = "chars"
 394         arr_len = "len"
 395     else:
 396         ma = var_ty_regex.match(fn_arg)
 397         if ma.group(1).strip() in unitary_enums:
 398             java_ty = ma.group(1).strip()
 399             c_ty = "jclass"
 400             fn_ty_arg = "Lorg/ldk/enums/" + ma.group(1).strip() + ";"
 401             fn_arg = ma.group(2).strip()
 402             rust_obj = ma.group(1).strip()
 403             take_by_ptr = True
 404         elif ma.group(1).strip().startswith("LDKC2Tuple"):
 405             java_ty = "long"
 406             java_hu_ty = "TwoTuple<"
 407             if not ma.group(1).strip() in tuple_types:
 408                 assert java_c_types_none_allowed
 409                 return None
 410             for idx, ty_info in enumerate(tuple_types[ma.group(1).strip()][0]):
 411                 if idx != 0:
 412                     java_hu_ty = java_hu_ty + ", "
 413                 if ty_info.is_native_primitive:
 414                     java_hu_ty = java_hu_ty + ty_info.java_hu_ty.title() # If we're a primitive, capitalize the first letter
 415                 else:
 416                     java_hu_ty = java_hu_ty + ty_info.java_hu_ty
 417             java_hu_ty = java_hu_ty + ">"
 418             c_ty = "jlong"
 419             fn_ty_arg = "J"
 420             fn_arg = ma.group(2).strip()
 421             rust_obj = ma.group(1).strip()
 422             take_by_ptr = True
 423         elif ma.group(1).strip().startswith("LDKC3Tuple"):
 424             java_ty = "long"
 425             java_hu_ty = "ThreeTuple<"
 426             if not ma.group(1).strip() in tuple_types:
 427                 assert java_c_types_none_allowed
 428                 return None
 429             for idx, ty_info in enumerate(tuple_types[ma.group(1).strip()][0]):
 430                 if idx != 0:
 431                     java_hu_ty = java_hu_ty + ", "
 432                 if ty_info.is_native_primitive:
 433                     java_hu_ty = java_hu_ty + ty_info.java_hu_ty.title() # If we're a primitive, capitalize the first letter
 434                 else:
 435                     java_hu_ty = java_hu_ty + ty_info.java_hu_ty
 436             java_hu_ty = java_hu_ty + ">"
 437             c_ty = "jlong"
 438             fn_ty_arg = "J"
 439             fn_arg = ma.group(2).strip()
 440             rust_obj = ma.group(1).strip()
 441             take_by_ptr = True
 442         else:
 443             java_ty = "long"
 444             java_hu_ty = ma.group(1).strip().replace("LDKCResult", "Result").replace("LDK", "")
 445             c_ty = "jlong"
 446             fn_ty_arg = "J"
 447             fn_arg = ma.group(2).strip()
 448             rust_obj = ma.group(1).strip()
 449             take_by_ptr = True
 450
 451     if fn_arg.startswith(" *") or fn_arg.startswith("*"):
 452         fn_arg = fn_arg.replace("*", "").strip()
 453         is_ptr = True
 454         c_ty = "jlong"
 455         java_ty = "long"
 456         fn_ty_arg = "J"
 457         is_primitive = False
 458
 459     var_is_arr = var_is_arr_regex.match(fn_arg)
 460     if var_is_arr is not None or ret_arr_len is not None:
 461         assert(not take_by_ptr)
 462         assert(not is_ptr)
 463         java_ty = java_ty + "[]"
 464         c_ty = c_ty + "Array"
 465         if var_is_arr is not None:
 466             if var_is_arr.group(1) == "":
 467                 return TypeInfo(rust_obj=rust_obj, java_ty=java_ty, java_hu_ty=java_ty, java_fn_ty_arg="[" + fn_ty_arg, c_ty=c_ty,
 468                     passed_as_ptr=False, is_ptr=False, var_name="arg", arr_len=var_is_arr.group(2), arr_access=arr_access, is_native_primitive=False)
 469             return TypeInfo(rust_obj=rust_obj, java_ty=java_ty, java_hu_ty=java_ty, java_fn_ty_arg="[" + fn_ty_arg, c_ty=c_ty,
 470                 passed_as_ptr=False, is_ptr=False, var_name=var_is_arr.group(1), arr_len=var_is_arr.group(2), arr_access=arr_access, is_native_primitive=False)
 471
 472     if java_hu_ty is None:
 473         java_hu_ty = java_ty
 474     return TypeInfo(rust_obj=rust_obj, java_ty=java_ty, java_hu_ty=java_hu_ty, java_fn_ty_arg=fn_ty_arg, c_ty=c_ty, passed_as_ptr=is_ptr or take_by_ptr,
 475         is_ptr=is_ptr, var_name=fn_arg, arr_len=arr_len, arr_access=arr_access, is_native_primitive=is_primitive)
 476
 477 fn_ptr_regex = re.compile("^extern const ([A-Za-z_0-9\* ]*) \(\*(.*)\)\((.*)\);$")
 478 fn_ret_arr_regex = re.compile("(.*) \(\*(.*)\((.*)\)\)\[([0-9]*)\];$")
 479 reg_fn_regex = re.compile("([A-Za-z_0-9\* ]* \*?)([a-zA-Z_0-9]*)\((.*)\);$")
 480 clone_fns = set()
 481 constructor_fns = {}
 482 c_array_class_caches = set()
 483 with open(sys.argv[1]) as in_h:
 484     for line in in_h:
 485         reg_fn = reg_fn_regex.match(line)
 486         if reg_fn is not None:
 487             if reg_fn.group(2).endswith("_clone"):
 488                 clone_fns.add(reg_fn.group(2))
 489             else:
 490                 rty = java_c_types(reg_fn.group(1), None)
 491                 if rty is not None and rty.rust_obj is not None and reg_fn.group(2) == rty.java_hu_ty + "_new":
 492                     constructor_fns[rty.rust_obj] = reg_fn.group(3)
 493             continue
 494         arr_fn = fn_ret_arr_regex.match(line)
 495         if arr_fn is not None:
 496             if arr_fn.group(2).endswith("_clone"):
 497                 clone_fns.add(arr_fn.group(2))
 498             # No object constructors return arrays, as then they wouldn't be an object constructor
 499             continue
 500 java_c_types_none_allowed = False # C structs created by cbindgen are declared in dependency order
 501
 502 with open(sys.argv[1]) as in_h, open(sys.argv[2], "w") as out_java:
 503     def map_type(fn_arg, print_void, ret_arr_len, is_free, holds_ref):
 504         ty_info = java_c_types(fn_arg, ret_arr_len)
 505         return map_type_with_info(ty_info, print_void, ret_arr_len, is_free, holds_ref)
 506
 507     def map_type_with_info(ty_info, print_void, ret_arr_len, is_free, holds_ref):
 508         if ty_info.c_ty == "void":
 509             if not print_void:
 510                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 511                     arg_conv = None, arg_conv_name = None, arg_conv_cleanup = None,
 512                     ret_conv = None, ret_conv_name = None, to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 513         if ty_info.c_ty.endswith("Array"):
 514             arr_len = ty_info.arr_len
 515             if arr_len is not None:
 516                 arr_name = ty_info.var_name
 517             else:
 518                 arr_name = "ret"
 519                 arr_len = ret_arr_len
 520             if ty_info.c_ty == "jbyteArray":
 521                 ret_conv = ("jbyteArray " + arr_name + "_arr = (*_env)->NewByteArray(_env, " + arr_len + ");\n" + "(*_env)->SetByteArrayRegion(_env, " + arr_name + "_arr, 0, " + arr_len + ", ", "")
 522                 arg_conv_cleanup = None
 523                 if not arr_len.isdigit():
 524                     arg_conv = ty_info.rust_obj + " " + arr_name + "_ref;\n"
 525                     arg_conv = arg_conv + arr_name + "_ref." + arr_len + " = (*_env)->GetArrayLength (_env, " + arr_name + ");\n"
 526                     if (not ty_info.is_ptr or not holds_ref) and ty_info.rust_obj != "LDKu8slice":
 527                         arg_conv = arg_conv + arr_name + "_ref." + ty_info.arr_access + " = MALLOC(" + arr_name + "_ref." + arr_len + ", \"" + ty_info.rust_obj + " Bytes\");\n"
 528                         arg_conv = arg_conv + "(*_env)->GetByteArrayRegion(_env, " + arr_name + ", 0, " + arr_name + "_ref." + arr_len + ", " + arr_name + "_ref." + ty_info.arr_access + ");"
 529                     else:
 530                         arg_conv = arg_conv + arr_name + "_ref." + ty_info.arr_access + " = (*_env)->GetByteArrayElements (_env, " + arr_name + ", NULL);"
 531                         arg_conv_cleanup = "(*_env)->ReleaseByteArrayElements(_env, " + arr_name + ", (int8_t*)" + arr_name + "_ref." + ty_info.arr_access + ", 0);"
 532                     if ty_info.rust_obj == "LDKTransaction":
 533                         arg_conv = arg_conv + "\n" + arr_name + "_ref.data_is_owned = " + str(holds_ref).lower() + ";"
 534                     ret_conv = (ty_info.rust_obj + " " + arr_name + "_var = ", "")
 535                     ret_conv = (ret_conv[0], ";\njbyteArray " + arr_name + "_arr = (*_env)->NewByteArray(_env, " + arr_name + "_var." + arr_len + ");\n")
 536                     ret_conv = (ret_conv[0], ret_conv[1] + "(*_env)->SetByteArrayRegion(_env, " + arr_name + "_arr, 0, " + arr_name + "_var." + arr_len + ", " + arr_name + "_var." + ty_info.arr_access + ");")
 537                     if not holds_ref and ty_info.rust_obj != "LDKu8slice":
 538                         ret_conv = (ret_conv[0], ret_conv[1] + "\n" + ty_info.rust_obj.replace("LDK", "") + "_free(" + arr_name + "_var);")
 539                 elif ty_info.rust_obj is not None:
 540                     arg_conv = ty_info.rust_obj + " " + arr_name + "_ref;\n"
 541                     arg_conv = arg_conv + "CHECK((*_env)->GetArrayLength (_env, " + arr_name + ") == " + arr_len + ");\n"
 542                     arg_conv = arg_conv + "(*_env)->GetByteArrayRegion (_env, " + arr_name + ", 0, " + arr_len + ", " + arr_name + "_ref." + ty_info.arr_access + ");"
 543                     ret_conv = (ret_conv[0], "." + ty_info.arr_access + ");")
 544                 else:
 545                     arg_conv = "unsigned char " + arr_name + "_arr[" + arr_len + "];\n"
 546                     arg_conv = arg_conv + "CHECK((*_env)->GetArrayLength (_env, " + arr_name + ") == " + arr_len + ");\n"
 547                     arg_conv = arg_conv + "(*_env)->GetByteArrayRegion (_env, " + arr_name + ", 0, " + arr_len + ", " + arr_name + "_arr);\n" + "unsigned char (*" + arr_name + "_ref)[" + arr_len + "] = &" + arr_name + "_arr;"
 548                     ret_conv = (ret_conv[0] + "*", ");")
 549                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 550                     arg_conv = arg_conv, arg_conv_name = arr_name + "_ref", arg_conv_cleanup = arg_conv_cleanup,
 551                     ret_conv = ret_conv, ret_conv_name = arr_name + "_arr", to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 552             else:
 553                 assert not arr_len.isdigit() # fixed length arrays not implemented
 554                 assert ty_info.java_ty[len(ty_info.java_ty) - 2:] == "[]"
 555                 conv_name = "arr_conv_" + str(len(ty_info.java_hu_ty))
 556                 idxc = chr(ord('a') + (len(ty_info.java_hu_ty) % 26))
 557                 ty_info.subty.var_name = conv_name
 558                 ty_info.subty.requires_clone = not ty_info.is_ptr or not holds_ref
 559                 subty = map_type_with_info(ty_info.subty, False, None, is_free, holds_ref)
 560                 if arr_name == "":
 561                     arr_name = "arg"
 562                 arg_conv = ty_info.rust_obj + " " + arr_name + "_constr;\n"
 563                 arg_conv = arg_conv + arr_name + "_constr." + arr_len + " = (*_env)->GetArrayLength (_env, " + arr_name + ");\n"
 564                 arg_conv = arg_conv + "if (" + arr_name + "_constr." + arr_len + " > 0)\n"
 565                 if subty.rust_obj is None:
 566                     szof = subty.c_ty
 567                 else:
 568                     szof = subty.rust_obj
 569                 arg_conv = arg_conv + "\t" + arr_name + "_constr." + ty_info.arr_access + " = MALLOC(" + arr_name + "_constr." + arr_len + " * sizeof(" + szof + "), \"" + ty_info.rust_obj + " Elements\");\n"
 570                 arg_conv = arg_conv + "else\n"
 571                 arg_conv = arg_conv + "\t" + arr_name + "_constr." + ty_info.arr_access + " = NULL;\n"
 572                 if not ty_info.java_ty[:len(ty_info.java_ty) - 2].endswith("[]"):
 573                     arg_conv = arg_conv + ty_info.java_ty.strip("[]") + "* " + arr_name + "_vals = (*_env)->Get" + ty_info.subty.java_ty.title() + "ArrayElements (_env, " + arr_name + ", NULL);\n"
 574                 arg_conv = arg_conv + "for (size_t " + idxc + " = 0; " + idxc + " < " + arr_name + "_constr." + arr_len + "; " + idxc + "++) {\n"
 575                 if not ty_info.java_ty[:len(ty_info.java_ty) - 2].endswith("[]"):
 576                     arg_conv = arg_conv + "\t" + ty_info.java_ty.strip("[]") + " " + conv_name + " = " + arr_name + "_vals[" + idxc + "];"
 577                     if subty.arg_conv is not None:
 578                         arg_conv = arg_conv + "\n\t" + subty.arg_conv.replace("\n", "\n\t")
 579                 else:
 580                     arg_conv = arg_conv + "\tjobject " + conv_name + " = (*_env)->GetObjectArrayElement(_env, " + arr_name + ", " + idxc + ");\n"
 581                     arg_conv = arg_conv + "\t" + subty.arg_conv.replace("\n", "\n\t")
 582                 arg_conv = arg_conv + "\n\t" + arr_name + "_constr." + ty_info.arr_access + "[" + idxc + "] = " + subty.arg_conv_name + ";\n}"
 583                 if not ty_info.java_ty[:len(ty_info.java_ty) - 2].endswith("[]"):
 584                     arg_conv = arg_conv + "\n(*_env)->Release" + ty_info.java_ty.strip("[]").title() + "ArrayElements (_env, " + arr_name + ", " + arr_name + "_vals, 0);"
 585                 if ty_info.is_ptr:
 586                     arg_conv_name = "&" + arr_name + "_constr"
 587                 else:
 588                     arg_conv_name = arr_name + "_constr"
 589                 arg_conv_cleanup = None
 590                 if ty_info.is_ptr:
 591                     arg_conv_cleanup = "FREE(" + arr_name + "_constr." + ty_info.arr_access + ");"
 592
 593                 if arr_name == "arg":
 594                     arr_name = "ret"
 595                 ret_conv = (ty_info.rust_obj + " " + arr_name + "_var = ", "")
 596                 if subty.ret_conv is None:
 597                     ret_conv = ("DUMMY", "DUMMY")
 598                 elif not ty_info.java_ty[:len(ty_info.java_ty) - 2].endswith("[]"):
 599                     ret_conv = (ret_conv[0], ";\n" + ty_info.c_ty + " " + arr_name + "_arr = (*_env)->New" + ty_info.java_ty.strip("[]").title() + "Array(_env, " + arr_name + "_var." + arr_len + ");\n")
 600                     ret_conv = (ret_conv[0], ret_conv[1] + subty.c_ty + " *" + arr_name + "_arr_ptr = (*_env)->GetPrimitiveArrayCritical(_env, " + arr_name + "_arr, NULL);\n")
 601                     ret_conv = (ret_conv[0], ret_conv[1] + "for (size_t " + idxc + " = 0; " + idxc + " < " + arr_name + "_var." + arr_len + "; " + idxc + "++) {\n")
 602                     ret_conv = (ret_conv[0], ret_conv[1] + "\t" + subty.ret_conv[0].replace("\n", "\n\t"))
 603                     ret_conv = (ret_conv[0], ret_conv[1] + arr_name + "_var." + ty_info.arr_access + "[" + idxc + "]" + subty.ret_conv[1].replace("\n", "\n\t"))
 604                     ret_conv = (ret_conv[0], ret_conv[1] + "\n\t" + arr_name + "_arr_ptr[" + idxc + "] = " + subty.ret_conv_name + ";\n")
 605                     ret_conv = (ret_conv[0], ret_conv[1] + "}\n(*_env)->ReleasePrimitiveArrayCritical(_env, " + arr_name + "_arr, " + arr_name + "_arr_ptr, 0);")
 606                 else:
 607                     assert ty_info.java_fn_ty_arg.startswith("[")
 608                     clz_var = ty_info.java_fn_ty_arg[1:].replace("[", "arr_of_")
 609                     c_array_class_caches.add(clz_var)
 610                     ret_conv = (ret_conv[0], ";\n" + ty_info.c_ty + " " + arr_name + "_arr = (*_env)->NewObjectArray(_env, " + arr_name + "_var." + arr_len + ", " + clz_var + "_clz, NULL);\n")
 611                     ret_conv = (ret_conv[0], ret_conv[1] + "for (size_t " + idxc + " = 0; " + idxc + " < " + arr_name + "_var." + arr_len + "; " + idxc + "++) {\n")
 612                     ret_conv = (ret_conv[0], ret_conv[1] + "\t" + subty.ret_conv[0].replace("\n", "\n\t"))
 613                     ret_conv = (ret_conv[0], ret_conv[1] + arr_name + "_var." + ty_info.arr_access + "[" + idxc + "]" + subty.ret_conv[1].replace("\n", "\n\t"))
 614                     ret_conv = (ret_conv[0], ret_conv[1] + "\n\t(*_env)->SetObjectArrayElement(_env, " + arr_name + "_arr, " + idxc + ", " + subty.ret_conv_name + ");\n")
 615                     ret_conv = (ret_conv[0], ret_conv[1] + "}")
 616                 if not holds_ref:
 617                     if subty.rust_obj is not None and subty.rust_obj in opaque_structs:
 618                         ret_conv = (ret_conv[0], ret_conv[1] + "\nFREE(" + arr_name + "_var." + ty_info.arr_access + ");")
 619                     else:
 620                         ret_conv = (ret_conv[0], ret_conv[1] + "\n" + ty_info.rust_obj.replace("LDK", "") + "_free(" + arr_name + "_var);")
 621
 622                 to_hu_conv = None
 623                 to_hu_conv_name = None
 624                 if subty.to_hu_conv is not None:
 625                     to_hu_conv = ty_info.java_hu_ty + " " + conv_name + "_arr = new " + ty_info.subty.java_hu_ty.split("<")[0] + "[" + arr_name + ".length];\n"
 626                     to_hu_conv = to_hu_conv + "for (int " + idxc + " = 0; " + idxc + " < " + arr_name + ".length; " + idxc + "++) {\n"
 627                     to_hu_conv = to_hu_conv + "\t" + subty.java_ty + " " + conv_name + " = " + arr_name + "[" + idxc + "];\n"
 628                     to_hu_conv = to_hu_conv + "\t" + subty.to_hu_conv.replace("\n", "\n\t") + "\n"
 629                     to_hu_conv = to_hu_conv + "\t" + conv_name + "_arr[" + idxc + "] = " + subty.to_hu_conv_name + ";\n}"
 630                     to_hu_conv_name = conv_name + "_arr"
 631                 from_hu_conv = None
 632                 if subty.from_hu_conv is not None:
 633                     if subty.java_ty == "long" and subty.java_hu_ty != "long":
 634                         from_hu_conv = ("Arrays.stream(" + arr_name + ").mapToLong(" + conv_name + " -> " + subty.from_hu_conv[0] + ").toArray()", "/* TODO 2 " + subty.java_hu_ty + "  */")
 635                     elif subty.java_ty == "long":
 636                         from_hu_conv = ("Arrays.stream(" + arr_name + ").map(" + conv_name + " -> " + subty.from_hu_conv[0] + ").toArray()", "/* TODO 2 " + subty.java_hu_ty + "  */")
 637                     else:
 638                         from_hu_conv = ("(" + ty_info.java_ty + ")Arrays.stream(" + arr_name + ").map(" + conv_name + " -> " + subty.from_hu_conv[0] + ").toArray()", "/* TODO 2 " + subty.java_hu_ty + "  */")
 639
 640                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 641                     arg_conv = arg_conv, arg_conv_name = arg_conv_name, arg_conv_cleanup = arg_conv_cleanup,
 642                     ret_conv = ret_conv, ret_conv_name = arr_name + "_arr", to_hu_conv = to_hu_conv, to_hu_conv_name = to_hu_conv_name, from_hu_conv = from_hu_conv)
 643         elif ty_info.java_ty == "String":
 644             if ty_info.arr_access is None:
 645                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 646                     arg_conv = None, arg_conv_name = None, arg_conv_cleanup = None,
 647                     ret_conv = ("jstring " + ty_info.var_name + "_conv = (*_env)->NewStringUTF(_env, ", ");"), ret_conv_name = ty_info.var_name + "_conv",
 648                     to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 649             else:
 650                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 651                     arg_conv = None, arg_conv_name = None, arg_conv_cleanup = None,
 652                     ret_conv = ("LDKStr " + ty_info.var_name + "_str = ",
 653                         ";\nchar* " + ty_info.var_name + "_buf = MALLOC(" + ty_info.var_name + "_str." + ty_info.arr_len + " + 1, \"str conv buf\");\n" +
 654                         "memcpy(" + ty_info.var_name + "_buf, " + ty_info.var_name + "_str." + ty_info.arr_access + ", " + ty_info.var_name + "_str." + ty_info.arr_len + ");\n" +
 655                         ty_info.var_name + "_buf[" + ty_info.var_name + "_str." + ty_info.arr_len + "] = 0;\n" +
 656                         "jstring " + ty_info.var_name + "_conv = (*_env)->NewStringUTF(_env, " + ty_info.var_name + "_str." + ty_info.arr_access + ");\n" +
 657                         "FREE(" + ty_info.var_name + "_buf);"),
 658                     ret_conv_name = ty_info.var_name + "_conv", to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 659         elif ty_info.var_name == "" and not print_void:
 660             # We don't have a parameter name, and want one, just call it arg
 661             if ty_info.rust_obj is not None:
 662                 assert(not is_free or ty_info.rust_obj not in opaque_structs)
 663                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 664                     arg_conv = ty_info.rust_obj + " arg_conv = *(" + ty_info.rust_obj + "*)arg;\nFREE((void*)arg);",
 665                     arg_conv_name = "arg_conv", arg_conv_cleanup = None,
 666                     ret_conv = None, ret_conv_name = None, to_hu_conv = "TODO 7", to_hu_conv_name = None, from_hu_conv = None)
 667             else:
 668                 assert(not is_free)
 669                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 670                     arg_conv = None, arg_conv_name = "arg", arg_conv_cleanup = None,
 671                     ret_conv = None, ret_conv_name = None, to_hu_conv = "TODO 8", to_hu_conv_name = None, from_hu_conv = None)
 672         elif ty_info.rust_obj is None:
 673             return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 674                 arg_conv = None, arg_conv_name = ty_info.var_name, arg_conv_cleanup = None,
 675                 ret_conv = None, ret_conv_name = None, to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 676         else:
 677             if ty_info.var_name == "":
 678                 ty_info.var_name = "ret"
 679
 680             if ty_info.rust_obj in opaque_structs:
 681                 opaque_arg_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv;\n"
 682                 opaque_arg_conv = opaque_arg_conv + ty_info.var_name + "_conv.inner = (void*)(" + ty_info.var_name + " & (~1));\n"
 683                 if ty_info.is_ptr and holds_ref:
 684                     opaque_arg_conv = opaque_arg_conv + ty_info.var_name + "_conv.is_owned = false;"
 685                 else:
 686                     opaque_arg_conv = opaque_arg_conv + ty_info.var_name + "_conv.is_owned = (" + ty_info.var_name + " & 1) || (" + ty_info.var_name + " == 0);"
 687                 if not is_free and (not ty_info.is_ptr or not holds_ref or ty_info.requires_clone == True) and ty_info.requires_clone != False:
 688                     if (ty_info.java_hu_ty + "_clone") in clone_fns:
 689                         # TODO: This is a bit too naive, even with the checks above, we really need to know if rust wants a ref or not, not just if its pass as a ptr.
 690                         opaque_arg_conv = opaque_arg_conv + "\nif (" + ty_info.var_name + "_conv.inner != NULL)\n"
 691                         opaque_arg_conv = opaque_arg_conv + "\t" + ty_info.var_name + "_conv = " + ty_info.java_hu_ty + "_clone(&" + ty_info.var_name + "_conv);"
 692                     elif ty_info.passed_as_ptr:
 693                         opaque_arg_conv = opaque_arg_conv + "\n// Warning: we may need a move here but can't clone!"
 694
 695                 opaque_ret_conv_suf = ";\n"
 696                 if not holds_ref and ty_info.is_ptr and (ty_info.java_hu_ty + "_clone") in clone_fns: # is_ptr, not holds_ref implies passing a pointed-to value to java, which needs copied
 697                     opaque_ret_conv_suf = opaque_ret_conv_suf + "if (" + ty_info.var_name + "->inner != NULL)\n"
 698                     opaque_ret_conv_suf = opaque_ret_conv_suf + "\t" + ty_info.var_name + "_var = " + ty_info.java_hu_ty + "_clone(" + ty_info.var_name + ");\n"
 699                 elif not holds_ref and ty_info.is_ptr:
 700                     opaque_ret_conv_suf = opaque_ret_conv_suf + "// Warning: we may need a move here but can't clone!\n"
 701
 702                 opaque_ret_conv_suf = opaque_ret_conv_suf + "CHECK((((long)" + ty_info.var_name + "_var.inner) & 1) == 0); // We rely on a free low bit, malloc guarantees this.\n"
 703                 opaque_ret_conv_suf = opaque_ret_conv_suf + "CHECK((((long)&" + ty_info.var_name + "_var) & 1) == 0); // We rely on a free low bit, pointer alignment guarantees this.\n"
 704                 if holds_ref:
 705                     opaque_ret_conv_suf = opaque_ret_conv_suf + "long " + ty_info.var_name + "_ref = (long)" + ty_info.var_name + "_var.inner & ~1;"
 706                 else:
 707                     opaque_ret_conv_suf = opaque_ret_conv_suf + "long " + ty_info.var_name + "_ref = (long)" + ty_info.var_name + "_var.inner;\n"
 708                     opaque_ret_conv_suf = opaque_ret_conv_suf + "if (" + ty_info.var_name + "_var.is_owned) {\n"
 709                     opaque_ret_conv_suf = opaque_ret_conv_suf + "\t" + ty_info.var_name + "_ref |= 1;\n"
 710                     opaque_ret_conv_suf = opaque_ret_conv_suf + "}"
 711
 712                 if ty_info.is_ptr:
 713                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 714                         arg_conv = opaque_arg_conv, arg_conv_name = "&" + ty_info.var_name + "_conv", arg_conv_cleanup = None,
 715                         ret_conv = (ty_info.rust_obj + " " + ty_info.var_name + "_var = *", opaque_ret_conv_suf),
 716                         ret_conv_name = ty_info.var_name + "_ref",
 717                         to_hu_conv = ty_info.java_hu_ty + " " + ty_info.var_name + "_hu_conv = new " + ty_info.java_hu_ty + "(null, " + ty_info.var_name + ");",
 718                         to_hu_conv_name = ty_info.var_name + "_hu_conv",
 719                         from_hu_conv = (ty_info.var_name + " == null ? 0 : " + ty_info.var_name + ".ptr & ~1", "this.ptrs_to.add(" + ty_info.var_name + ")"))
 720                 else:
 721                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 722                         arg_conv = opaque_arg_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 723                         ret_conv = (ty_info.rust_obj + " " + ty_info.var_name + "_var = ", opaque_ret_conv_suf),
 724                         ret_conv_name = ty_info.var_name + "_ref",
 725                         to_hu_conv = ty_info.java_hu_ty + " " + ty_info.var_name + "_hu_conv = new " + ty_info.java_hu_ty + "(null, " + ty_info.var_name + ");",
 726                         to_hu_conv_name = ty_info.var_name + "_hu_conv",
 727                         from_hu_conv = (ty_info.var_name + " == null ? 0 : " + ty_info.var_name + ".ptr & ~1", "this.ptrs_to.add(" + ty_info.var_name + ")"))
 728
 729             if not ty_info.is_ptr:
 730                 if ty_info.rust_obj in unitary_enums:
 731                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 732                         arg_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv = " + ty_info.rust_obj + "_from_java(_env, " + ty_info.var_name + ");",
 733                         arg_conv_name = ty_info.var_name + "_conv",
 734                         arg_conv_cleanup = None,
 735                         ret_conv = ("jclass " + ty_info.var_name + "_conv = " + ty_info.rust_obj + "_to_java(_env, ", ");"),
 736                         ret_conv_name = ty_info.var_name + "_conv", to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 737                 base_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv = *(" + ty_info.rust_obj + "*)" + ty_info.var_name + ";"
 738                 if ty_info.rust_obj in trait_structs:
 739                     if not is_free:
 740                         needs_full_clone = not is_free and (not ty_info.is_ptr and not holds_ref or ty_info.requires_clone == True) and ty_info.requires_clone != False
 741                         if needs_full_clone and (ty_info.java_hu_ty + "_clone") in clone_fns:
 742                             base_conv = base_conv + "\n" + ty_info.var_name + "_conv = " + ty_info.java_hu_ty + "_clone(" + ty_info.var_name + ");"
 743                         else:
 744                             base_conv = base_conv + "\nif (" + ty_info.var_name + "_conv.free == " + ty_info.rust_obj + "_JCalls_free) {\n"
 745                             base_conv = base_conv + "\t// If this_arg is a JCalls struct, then we need to increment the refcnt in it.\n"
 746                             base_conv = base_conv + "\t" + ty_info.rust_obj + "_JCalls_clone(" + ty_info.var_name + "_conv.this_arg);\n}"
 747                             if needs_full_clone:
 748                                 base_conv = base_conv + "// Warning: we may need a move here but can't do a full clone!\n"
 749
 750                     else:
 751                         base_conv = base_conv + "\n" + "FREE((void*)" + ty_info.var_name + ");"
 752                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 753                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 754                         ret_conv = (ty_info.rust_obj + "* ret = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n*ret = ", ";"),
 755                         ret_conv_name = "(long)ret",
 756                         to_hu_conv = ty_info.java_hu_ty + " ret_hu_conv = new " + ty_info.java_hu_ty + "(null, ret);\nret_hu_conv.ptrs_to.add(this);",
 757                         to_hu_conv_name = "ret_hu_conv",
 758                         from_hu_conv = (ty_info.var_name + " == null ? 0 : " + ty_info.var_name + ".ptr", "this.ptrs_to.add(" + ty_info.var_name + ")"))
 759                 if ty_info.rust_obj != "LDKu8slice":
 760                     # Don't bother free'ing slices passed in - Rust doesn't auto-free the
 761                     # underlying unlike Vecs, and it gives Java more freedom.
 762                     base_conv = base_conv + "\nFREE((void*)" + ty_info.var_name + ");";
 763                 if ty_info.rust_obj in complex_enums:
 764                     ret_conv = ("long " + ty_info.var_name + "_ref = (long)&", ";")
 765                     if not holds_ref:
 766                         ret_conv = (ty_info.rust_obj + " *" + ty_info.var_name + "_copy = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n", "")
 767                         if ty_info.requires_clone == True: # Set in object array mapping
 768                             if (ty_info.java_hu_ty + "_clone") in clone_fns:
 769                                 ret_conv = (ret_conv[0] + "*" + ty_info.var_name + "_copy = " + ty_info.java_hu_ty + "_clone(&", ");\n")
 770                             else:
 771                                 ret_conv = (ret_conv[0] + "*" + ty_info.var_name + "_copy = ", "; // XXX: We likely need to clone here, but no _clone fn is available!\n")
 772                         else:
 773                             ret_conv = (ret_conv[0] + "*" + ty_info.var_name + "_copy = ", ";\n")
 774                         ret_conv = (ret_conv[0], ret_conv[1] + "long " + ty_info.var_name + "_ref = (long)" + ty_info.var_name + "_copy;")
 775                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 776                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 777                         ret_conv = ret_conv, ret_conv_name = ty_info.var_name + "_ref",
 778                         to_hu_conv = ty_info.java_hu_ty + " " + ty_info.var_name + "_hu_conv = " + ty_info.java_hu_ty + ".constr_from_ptr(" + ty_info.var_name + ");\n" + ty_info.var_name + "_hu_conv.ptrs_to.add(this);",
 779                         to_hu_conv_name = ty_info.var_name + "_hu_conv", from_hu_conv = (ty_info.var_name + ".ptr", ""))
 780                 if ty_info.rust_obj in result_types:
 781                     assert not ty_info.is_ptr and not holds_ref # Otherwise we shouldn't be MALLOC'ing
 782                     ret_conv = (ty_info.rust_obj + "* " + ty_info.var_name + "_conv = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n*" + ty_info.var_name + "_conv = ", ";")
 783                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 784                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 785                         ret_conv = ret_conv, ret_conv_name = "(long)" + ty_info.var_name + "_conv",
 786                         to_hu_conv = ty_info.java_hu_ty + " " + ty_info.var_name + "_hu_conv = " + ty_info.java_hu_ty + ".constr_from_ptr(" + ty_info.var_name + ");\n" + ty_info.var_name + "_hu_conv.ptrs_to.add(this);",
 787                         to_hu_conv_name = ty_info.var_name + "_hu_conv", from_hu_conv = (ty_info.var_name + " != null ? " + ty_info.var_name + ".ptr : 0", ""))
 788                 if ty_info.rust_obj in tuple_types:
 789                     from_hu_conv = "bindings." + tuple_types[ty_info.rust_obj][1].replace("LDK", "") + "_new("
 790                     to_hu_conv_pfx = ""
 791                     to_hu_conv_sfx = ty_info.java_hu_ty + " " + ty_info.var_name + "_conv = new " + ty_info.java_hu_ty + "("
 792                     for idx, conv in enumerate(tuple_types[ty_info.rust_obj][0]):
 793                         if idx != 0:
 794                             to_hu_conv_sfx = to_hu_conv_sfx + ", "
 795                             from_hu_conv = from_hu_conv + ", "
 796                         conv.var_name = ty_info.var_name + "_" + chr(idx + ord("a"))
 797                         conv_map = map_type_with_info(conv, False, None, is_free, holds_ref)
 798                         to_hu_conv_pfx = to_hu_conv_pfx + conv.java_ty + " " + ty_info.var_name + "_" + chr(idx + ord("a")) + " = " + "bindings." + tuple_types[ty_info.rust_obj][1] + "_get_" + chr(idx + ord("a")) + "(" + ty_info.var_name + ");\n"
 799                         if conv_map.to_hu_conv is not None:
 800                             to_hu_conv_pfx = to_hu_conv_pfx + conv_map.to_hu_conv + ";\n"
 801                             to_hu_conv_sfx = to_hu_conv_sfx + conv_map.to_hu_conv_name
 802                         else:
 803                             to_hu_conv_sfx = to_hu_conv_sfx + ty_info.var_name + "_" + chr(idx + ord("a"))
 804                         if conv_map.from_hu_conv is not None:
 805                             from_hu_conv = from_hu_conv + conv_map.from_hu_conv[0].replace(ty_info.var_name + "_" + chr(idx + ord("a")), ty_info.var_name + "." + chr(idx + ord("a")))
 806                             if conv_map.from_hu_conv[1] != "":
 807                                 from_hu_conv = from_hu_conv + "/*XXX: " + conv_map.from_hu_conv[1] + "*/"
 808                         else:
 809                             from_hu_conv = from_hu_conv + ty_info.var_name + "." + chr(idx + ord("a"))
 810
 811                     if not ty_info.is_ptr and not holds_ref:
 812                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 813                             arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 814
 815                             ret_conv = (ty_info.rust_obj + "* " + ty_info.var_name + "_ref = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n*" + ty_info.var_name + "_ref = ", ";"),
 816                             ret_conv_name = "(long)" + ty_info.var_name + "_ref",
 817                             to_hu_conv = to_hu_conv_pfx + to_hu_conv_sfx + ");", to_hu_conv_name = ty_info.var_name + "_conv", from_hu_conv = (from_hu_conv + ")", ""))
 818                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 819                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 820                         ret_conv = ("long " + ty_info.var_name + "_ref = (long)&", ";"), ret_conv_name = ty_info.var_name + "_ref",
 821                         to_hu_conv = to_hu_conv_pfx + to_hu_conv_sfx + ");", to_hu_conv_name = ty_info.var_name + "_conv", from_hu_conv = (from_hu_conv + ")", ""))
 822
 823                 # The manually-defined types - TxOut and Transaction
 824                 assert ty_info.rust_obj == "LDKTxOut"
 825                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 826                     arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 827                     ret_conv = ("long " + ty_info.var_name + "_ref = (long)&", ";"), ret_conv_name = ty_info.var_name + "_ref",
 828                     to_hu_conv = ty_info.java_hu_ty + " " + ty_info.var_name + "_conv = new " +ty_info.java_hu_ty + "(null, " + ty_info.var_name + ");",
 829                     to_hu_conv_name = ty_info.var_name + "_conv", from_hu_conv = (ty_info.var_name + ".ptr", ""))
 830             elif ty_info.is_ptr:
 831                 assert(not is_free)
 832                 if ty_info.rust_obj in complex_enums:
 833                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 834                         arg_conv = ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)" + ty_info.var_name + ";",
 835                         arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 836                         ret_conv = ("long ret_" + ty_info.var_name + " = (long)", ";"), ret_conv_name = "ret_" + ty_info.var_name,
 837                         to_hu_conv = ty_info.java_hu_ty + " " + ty_info.var_name + "_hu_conv = " + ty_info.java_hu_ty + ".constr_from_ptr(" + ty_info.var_name + ");",
 838                         to_hu_conv_name = ty_info.var_name + "_hu_conv",
 839                         from_hu_conv = (ty_info.var_name + " == null ? 0 : " + ty_info.var_name + ".ptr & ~1", "this.ptrs_to.add(" + ty_info.var_name + ")"))
 840                 elif ty_info.rust_obj in trait_structs:
 841                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 842                         arg_conv = ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)" + ty_info.var_name + ";",
 843                         arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 844                         ret_conv = ("long ret_" + ty_info.var_name + " = (long)", ";"), ret_conv_name = "ret_" + ty_info.var_name,
 845                         to_hu_conv = ty_info.java_hu_ty + " ret_hu_conv = new " + ty_info.java_hu_ty + "(null, ret);\nret_hu_conv.ptrs_to.add(this);",
 846                         to_hu_conv_name = "ret_hu_conv",
 847                         from_hu_conv = (ty_info.var_name + " == null ? 0 : " + ty_info.var_name + ".ptr", "this.ptrs_to.add(" + ty_info.var_name + ")"))
 848                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 849                     arg_conv = ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)" + ty_info.var_name + ";",
 850                     arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 851                     ret_conv = ("long ret_" + ty_info.var_name + " = (long)", ";"), ret_conv_name = "ret_" + ty_info.var_name,
 852                     to_hu_conv = "TODO 3", to_hu_conv_name = None, from_hu_conv = None) # its a pointer, no conv needed
 853             assert False # We should have handled every case by now.
 854
 855     def map_fn(line, re_match, ret_arr_len, c_call_string):
 856         out_java.write("\t// " + line)
 857         out_java.write("\tpublic static native ")
 858         write_c("JNIEXPORT ")
 859
 860         is_free = re_match.group(2).endswith("_free")
 861         struct_meth = re_match.group(2).split("_")[0]
 862
 863         ret_info = map_type(re_match.group(1), True, ret_arr_len, False, False)
 864         ret_info.print_ty()
 865
 866         if ret_info.ret_conv is not None:
 867             ret_conv_pfx, ret_conv_sfx = ret_info.ret_conv
 868
 869         out_java.write(" " + re_match.group(2) + "(")
 870         write_c(" JNICALL Java_org_ldk_impl_bindings_" + re_match.group(2).replace('_', '_1') + "(JNIEnv * _env, jclass _b")
 871
 872         arg_names = []
 873         default_constructor_args = {}
 874         takes_self = False
 875         args_known = not ret_info.passed_as_ptr or ret_info.rust_obj in opaque_structs or ret_info.rust_obj in trait_structs or ret_info.rust_obj in complex_enums or ret_info.rust_obj in result_types
 876         for idx, arg in enumerate(re_match.group(3).split(',')):
 877             if idx != 0:
 878                 out_java.write(", ")
 879             if arg != "void":
 880                 write_c(", ")
 881             arg_conv_info = map_type(arg, False, None, is_free, True)
 882             if arg_conv_info.c_ty != "void":
 883                 arg_conv_info.print_ty()
 884                 arg_conv_info.print_name()
 885             if arg_conv_info.arg_name == "this_ptr" or arg_conv_info.arg_name == "this_arg":
 886                 takes_self = True
 887             if arg_conv_info.arg_conv is not None and "Warning" in arg_conv_info.arg_conv:
 888                 if arg_conv_info.rust_obj in constructor_fns:
 889                     assert not is_free
 890                     for explode_arg in constructor_fns[arg_conv_info.rust_obj].split(','):
 891                         explode_arg_conv = map_type(explode_arg, False, None, False, True)
 892                         if explode_arg_conv.c_ty == "void":
 893                             # We actually want to handle this case, but for now its only used in NetGraphMsgHandler::new()
 894                             # which ends up resulting in a redundant constructor - both without arguments for the NetworkGraph.
 895                             args_known = False
 896                         assert explode_arg_conv.arg_name != "this_ptr"
 897                         assert explode_arg_conv.arg_name != "this_arg"
 898                         if explode_arg_conv.passed_as_ptr and not explode_arg_conv.rust_obj in trait_structs:
 899                             args_known = False
 900                         if not arg_conv_info.arg_name in default_constructor_args:
 901                             default_constructor_args[arg_conv_info.arg_name] = []
 902                         default_constructor_args[arg_conv_info.arg_name].append(explode_arg_conv)
 903                 else:
 904                     args_known = False
 905             arg_names.append(arg_conv_info)
 906
 907         out_java_struct = None
 908         if ("LDK" + struct_meth in opaque_structs or "LDK" + struct_meth in trait_structs) and not is_free:
 909             out_java_struct = open(sys.argv[3] + "/structs/" + struct_meth + ".java", "a")
 910             if not args_known:
 911                 out_java_struct.write("\t// Skipped " + re_match.group(2) + "\n")
 912                 out_java_struct.close()
 913                 out_java_struct = None
 914             else:
 915                 meth_n = re_match.group(2)[len(struct_meth) + 1:]
 916                 if ret_info.rust_obj == "LDK" + struct_meth:
 917                     out_java_struct.write("\tpublic static " + ret_info.java_hu_ty + " constructor_" + meth_n + "(")
 918                 else:
 919                     out_java_struct.write("\tpublic " + ret_info.java_hu_ty + " " + meth_n + "(")
 920                 for idx, arg in enumerate(arg_names):
 921                     if idx != 0:
 922                         if not takes_self or idx > 1:
 923                             out_java_struct.write(", ")
 924                     if arg.java_ty != "void" and arg.arg_name != "this_ptr" and arg.arg_name != "this_arg":
 925                         if arg.arg_name in default_constructor_args:
 926                             for explode_idx, explode_arg in enumerate(default_constructor_args[arg.arg_name]):
 927                                 if explode_idx != 0:
 928                                     out_java_struct.write(", ")
 929                                 assert explode_arg.rust_obj in opaque_structs or explode_arg.rust_obj in trait_structs
 930                                 out_java_struct.write(explode_arg.java_hu_ty + " " + arg.arg_name + "_" + explode_arg.arg_name)
 931                         else:
 932                             out_java_struct.write(arg.java_hu_ty + " " + arg.arg_name)
 933
 934
 935         out_java.write(");\n")
 936         write_c(") {\n")
 937         if out_java_struct is not None:
 938             out_java_struct.write(") {\n")
 939
 940         for info in arg_names:
 941             if info.arg_conv is not None:
 942                 write_c("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
 943
 944         if ret_info.ret_conv is not None:
 945             write_c("\t" + ret_conv_pfx.replace('\n', '\n\t'))
 946         elif ret_info.c_ty != "void":
 947             write_c("\t" + ret_info.c_ty + " ret_val = ")
 948         else:
 949             write_c("\t")
 950
 951         if c_call_string is None:
 952             write_c(re_match.group(2) + "(")
 953         else:
 954             write_c(c_call_string)
 955         for idx, info in enumerate(arg_names):
 956             if info.arg_conv_name is not None:
 957                 if idx != 0:
 958                     write_c(", ")
 959                 elif c_call_string is not None:
 960                     continue
 961                 write_c(info.arg_conv_name)
 962         write_c(")")
 963         if ret_info.ret_conv is not None:
 964             write_c(ret_conv_sfx.replace('\n', '\n\t'))
 965         else:
 966             write_c(";")
 967         for info in arg_names:
 968             if info.arg_conv_cleanup is not None:
 969                 write_c("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
 970         if ret_info.ret_conv is not None:
 971             write_c("\n\treturn " + ret_info.ret_conv_name + ";")
 972         elif ret_info.c_ty != "void":
 973             write_c("\n\treturn ret_val;")
 974         write_c("\n}\n\n")
 975         if out_java_struct is not None:
 976             out_java_struct.write("\t\t")
 977             if ret_info.java_ty != "void":
 978                 out_java_struct.write(ret_info.java_ty + " ret = ")
 979             out_java_struct.write("bindings." + re_match.group(2) + "(")
 980             for idx, info in enumerate(arg_names):
 981                 if idx != 0:
 982                     out_java_struct.write(", ")
 983                 if info.arg_name == "this_ptr" or info.arg_name == "this_arg":
 984                     out_java_struct.write("this.ptr")
 985                 elif info.arg_name in default_constructor_args:
 986                     out_java_struct.write("bindings." + info.java_hu_ty + "_new(")
 987                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
 988                         if explode_idx != 0:
 989                             out_java_struct.write(", ")
 990                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
 991                         out_java_struct.write(explode_arg.from_hu_conv[0].replace(explode_arg.arg_name, expl_arg_name))
 992                     out_java_struct.write(")")
 993                 elif info.from_hu_conv is not None:
 994                     out_java_struct.write(info.from_hu_conv[0])
 995                 else:
 996                     out_java_struct.write(info.arg_name)
 997             out_java_struct.write(");\n")
 998             if ret_info.to_hu_conv is not None:
 999                 if ret_info.rust_obj == "LDK" + struct_meth:
1000                     out_java_struct.write("\t\t" + ret_info.to_hu_conv.replace("\n", "\n\t\t").replace("this", ret_info.to_hu_conv_name) + "\n")
1001                 else:
1002                     out_java_struct.write("\t\t" + ret_info.to_hu_conv.replace("\n", "\n\t\t") + "\n")
1003
1004             for info in arg_names:
1005                 if info.arg_name == "this_ptr" or info.arg_name == "this_arg":
1006                     pass
1007                 elif info.arg_name in default_constructor_args:
1008                     for explode_arg in default_constructor_args[info.arg_name]:
1009                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1010                         out_java_struct.write("\t\t" + explode_arg.from_hu_conv[1].replace(explode_arg.arg_name, expl_arg_name).replace("this", ret_info.to_hu_conv_name) + ";\n")
1011                 elif info.from_hu_conv is not None and info.from_hu_conv[1] != "":
1012                     if ret_info.rust_obj == "LDK" + struct_meth and ret_info.to_hu_conv_name is not None:
1013                         out_java_struct.write("\t\t" + info.from_hu_conv[1].replace("this", ret_info.to_hu_conv_name) + ";\n")
1014                     else:
1015                         out_java_struct.write("\t\t" + info.from_hu_conv[1] + ";\n")
1016
1017             if ret_info.to_hu_conv_name is not None:
1018                 out_java_struct.write("\t\treturn " + ret_info.to_hu_conv_name + ";\n")
1019             elif ret_info.java_ty != "void" and ret_info.rust_obj != "LDK" + struct_meth:
1020                 out_java_struct.write("\t\treturn ret;\n")
1021             out_java_struct.write("\t}\n\n")
1022             out_java_struct.close()
1023
1024     def map_unitary_enum(struct_name, field_lines):
1025         with open(sys.argv[3] + "/enums/" + struct_name + ".java", "w") as out_java_enum:
1026             out_java_enum.write("package org.ldk.enums;\n\n")
1027             unitary_enums.add(struct_name)
1028             write_c("static inline " + struct_name + " " + struct_name + "_from_java(JNIEnv *env, jclass val) {\n")
1029             write_c("\tswitch ((*env)->CallIntMethod(env, val, ordinal_meth)) {\n")
1030             ord_v = 0
1031             for idx, struct_line in enumerate(field_lines):
1032                 if idx == 0:
1033                     out_java_enum.write("public enum " + struct_name + " {\n")
1034                 elif idx == len(field_lines) - 3:
1035                     assert(struct_line.endswith("_Sentinel,"))
1036                 elif idx == len(field_lines) - 2:
1037                     out_java_enum.write("\t; static native void init();\n")
1038                     out_java_enum.write("\tstatic { init(); }\n")
1039                     out_java_enum.write("}")
1040                     out_java.write("\tstatic { " + struct_name + ".values(); /* Force enum statics to run */ }\n")
1041                 elif idx == len(field_lines) - 1:
1042                     assert(struct_line == "")
1043                 else:
1044                     out_java_enum.write(struct_line + "\n")
1045                     write_c("\t\tcase %d: return %s;\n" % (ord_v, struct_line.strip().strip(",")))
1046                     ord_v = ord_v + 1
1047             write_c("\t}\n")
1048             write_c("\tabort();\n")
1049             write_c("}\n")
1050
1051             ord_v = 0
1052             write_c("static jclass " + struct_name + "_class = NULL;\n")
1053             for idx, struct_line in enumerate(field_lines):
1054                 if idx > 0 and idx < len(field_lines) - 3:
1055                     variant = struct_line.strip().strip(",")
1056                     write_c("static jfieldID " + struct_name + "_" + variant + " = NULL;\n")
1057             write_c("JNIEXPORT void JNICALL Java_org_ldk_enums_" + struct_name.replace("_", "_1") + "_init (JNIEnv * env, jclass clz) {\n")
1058             write_c("\t" + struct_name + "_class = (*env)->NewGlobalRef(env, clz);\n")
1059             write_c("\tCHECK(" + struct_name + "_class != NULL);\n")
1060             for idx, struct_line in enumerate(field_lines):
1061                 if idx > 0 and idx < len(field_lines) - 3:
1062                     variant = struct_line.strip().strip(",")
1063                     write_c("\t" + struct_name + "_" + variant + " = (*env)->GetStaticFieldID(env, " + struct_name + "_class, \"" + variant + "\", \"Lorg/ldk/enums/" + struct_name + ";\");\n")
1064                     write_c("\tCHECK(" + struct_name + "_" + variant + " != NULL);\n")
1065             write_c("}\n")
1066             write_c("static inline jclass " + struct_name + "_to_java(JNIEnv *env, " + struct_name + " val) {\n")
1067             write_c("\tswitch (val) {\n")
1068             for idx, struct_line in enumerate(field_lines):
1069                 if idx > 0 and idx < len(field_lines) - 3:
1070                     variant = struct_line.strip().strip(",")
1071                     write_c("\t\tcase " + variant + ":\n")
1072                     write_c("\t\t\treturn (*env)->GetStaticObjectField(env, " + struct_name + "_class, " + struct_name + "_" + variant + ");\n")
1073                     ord_v = ord_v + 1
1074             write_c("\t\tdefault: abort();\n")
1075             write_c("\t}\n")
1076             write_c("}\n\n")
1077
1078     def map_complex_enum(struct_name, union_enum_items):
1079         java_hu_type = struct_name.replace("LDK", "")
1080         complex_enums.add(struct_name)
1081         with open(sys.argv[3] + "/structs/" + java_hu_type + ".java", "w") as out_java_enum:
1082             out_java_enum.write(hu_struct_file_prefix)
1083             out_java_enum.write("public class " + java_hu_type + " extends CommonBase {\n")
1084             out_java_enum.write("\tprivate " + java_hu_type + "(Object _dummy, long ptr) { super(ptr); }\n")
1085             out_java_enum.write("\t@Override @SuppressWarnings(\"deprecation\")\n")
1086             out_java_enum.write("\tprotected void finalize() throws Throwable {\n")
1087             out_java_enum.write("\t\tsuper.finalize();\n")
1088             out_java_enum.write("\t\tif (ptr != 0) { bindings." + java_hu_type + "_free(ptr); }\n")
1089             out_java_enum.write("\t}\n")
1090             out_java_enum.write("\tstatic " + java_hu_type + " constr_from_ptr(long ptr) {\n")
1091             out_java_enum.write("\t\tbindings." + struct_name + " raw_val = bindings." + struct_name + "_ref_from_ptr(ptr);\n")
1092             java_hu_subclasses = ""
1093
1094             tag_field_lines = union_enum_items["field_lines"]
1095             init_meth_jty_strs = {}
1096             for idx, struct_line in enumerate(tag_field_lines):
1097                 if idx == 0:
1098                     out_java.write("\tpublic static class " + struct_name + " {\n")
1099                     out_java.write("\t\tprivate " + struct_name + "() {}\n")
1100                 elif idx == len(tag_field_lines) - 3:
1101                     assert(struct_line.endswith("_Sentinel,"))
1102                 elif idx == len(tag_field_lines) - 2:
1103                     out_java.write("\t\tstatic native void init();\n")
1104                     out_java.write("\t}\n")
1105                 elif idx == len(tag_field_lines) - 1:
1106                     assert(struct_line == "")
1107                 else:
1108                     var_name = struct_line.strip(' ,')[len(struct_name) + 1:]
1109                     out_java.write("\t\tpublic final static class " + var_name + " extends " + struct_name + " {\n")
1110                     java_hu_subclasses = java_hu_subclasses + "\tpublic final static class " + var_name + " extends " + java_hu_type + " {\n"
1111                     out_java_enum.write("\t\tif (raw_val.getClass() == bindings." + struct_name + "." + var_name + ".class) {\n")
1112                     out_java_enum.write("\t\t\treturn new " + var_name + "(ptr, (bindings." + struct_name + "." + var_name + ")raw_val);\n")
1113                     write_c("static jclass " + struct_name + "_" + var_name + "_class = NULL;\n")
1114                     write_c("static jmethodID " + struct_name + "_" + var_name + "_meth = NULL;\n")
1115                     init_meth_jty_str = ""
1116                     init_meth_params = ""
1117                     init_meth_body = ""
1118                     hu_conv_body = ""
1119                     if "LDK" + var_name in union_enum_items:
1120                         enum_var_lines = union_enum_items["LDK" + var_name]
1121                         for idx, field in enumerate(enum_var_lines):
1122                             if idx != 0 and idx < len(enum_var_lines) - 2:
1123                                 field_ty = map_type(field.strip(' ;'), False, None, False, True)
1124                                 out_java.write("\t\t\tpublic " + field_ty.java_ty + " " + field_ty.arg_name + ";\n")
1125                                 java_hu_subclasses = java_hu_subclasses + "\t\tpublic final " + field_ty.java_hu_ty + " " + field_ty.arg_name + ";\n"
1126                                 if field_ty.to_hu_conv is not None:
1127                                     hu_conv_body = hu_conv_body + "\t\t\t" + field_ty.java_ty + " " + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
1128                                     hu_conv_body = hu_conv_body + "\t\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
1129                                     hu_conv_body = hu_conv_body + "\t\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
1130                                 else:
1131                                     hu_conv_body = hu_conv_body + "\t\t\tthis." + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
1132                                 init_meth_jty_str = init_meth_jty_str + field_ty.java_fn_ty_arg
1133                                 if idx > 1:
1134                                     init_meth_params = init_meth_params + ", "
1135                                 init_meth_params = init_meth_params + field_ty.java_ty + " " + field_ty.arg_name
1136                                 init_meth_body = init_meth_body + "this." + field_ty.arg_name + " = " + field_ty.arg_name + "; "
1137                         out_java.write("\t\t\t" + var_name + "(" + init_meth_params + ") { ")
1138                         out_java.write(init_meth_body)
1139                         out_java.write("}\n")
1140                     out_java.write("\t\t}\n")
1141                     out_java_enum.write("\t\t}\n")
1142                     java_hu_subclasses = java_hu_subclasses + "\t\tprivate " + var_name + "(long ptr, bindings." + struct_name + "." + var_name + " obj) {\n\t\t\tsuper(null, ptr);\n"
1143                     java_hu_subclasses = java_hu_subclasses + hu_conv_body
1144                     java_hu_subclasses = java_hu_subclasses + "\t\t}\n\t}\n"
1145                     init_meth_jty_strs[var_name] = init_meth_jty_str
1146             out_java_enum.write("\t\tassert false; return null; // Unreachable without extending the (internal) bindings interface\n\t}\n\n")
1147             out_java_enum.write(java_hu_subclasses)
1148             out_java.write("\tstatic { " + struct_name + ".init(); }\n")
1149             out_java.write("\tpublic static native " + struct_name + " " + struct_name + "_ref_from_ptr(long ptr);\n");
1150
1151             write_c("JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_00024" + struct_name.replace("_", "_1") + "_init (JNIEnv * env, jclass _a) {\n")
1152             for idx, struct_line in enumerate(tag_field_lines):
1153                 if idx != 0 and idx < len(tag_field_lines) - 3:
1154                     var_name = struct_line.strip(' ,')[len(struct_name) + 1:]
1155                     write_c("\t" + struct_name + "_" + var_name + "_class =\n")
1156                     write_c("\t\t(*env)->NewGlobalRef(env, (*env)->FindClass(env, \"Lorg/ldk/impl/bindings$" + struct_name + "$" + var_name + ";\"));\n")
1157                     write_c("\tCHECK(" + struct_name + "_" + var_name + "_class != NULL);\n")
1158                     write_c("\t" + struct_name + "_" + var_name + "_meth = (*env)->GetMethodID(env, " + struct_name + "_" + var_name + "_class, \"<init>\", \"(" + init_meth_jty_strs[var_name] + ")V\");\n")
1159                     write_c("\tCHECK(" + struct_name + "_" + var_name + "_meth != NULL);\n")
1160             write_c("}\n")
1161             write_c("JNIEXPORT jobject JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1ref_1from_1ptr (JNIEnv * _env, jclass _c, jlong ptr) {\n")
1162             write_c("\t" + struct_name + " *obj = (" + struct_name + "*)ptr;\n")
1163             write_c("\tswitch(obj->tag) {\n")
1164             for idx, struct_line in enumerate(tag_field_lines):
1165                 if idx != 0 and idx < len(tag_field_lines) - 3:
1166                     var_name = struct_line.strip(' ,')[len(struct_name) + 1:]
1167                     write_c("\t\tcase " + struct_name + "_" + var_name + ": {\n")
1168                     c_params_text = ""
1169                     if "LDK" + var_name in union_enum_items:
1170                         enum_var_lines = union_enum_items["LDK" + var_name]
1171                         for idx, field in enumerate(enum_var_lines):
1172                             if idx != 0 and idx < len(enum_var_lines) - 2:
1173                                 field_map = map_type(field.strip(' ;'), False, None, False, True)
1174                                 if field_map.ret_conv is not None:
1175                                     write_c("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
1176                                     write_c("obj->" + camel_to_snake(var_name) + "." + field_map.arg_name)
1177                                     write_c(field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
1178                                     c_params_text = c_params_text + ", " + field_map.ret_conv_name
1179                                 else:
1180                                     c_params_text = c_params_text + ", obj->" + camel_to_snake(var_name) + "." + field_map.arg_name
1181                     write_c("\t\t\treturn (*_env)->NewObject(_env, " + struct_name + "_" + var_name + "_class, " + struct_name + "_" + var_name + "_meth" + c_params_text + ");\n")
1182                     write_c("\t\t}\n")
1183             write_c("\t\tdefault: abort();\n")
1184             write_c("\t}\n}\n")
1185             out_java_enum.write("}\n")
1186
1187     def map_trait(struct_name, field_var_lines, trait_fn_lines):
1188         with open(sys.argv[3] + "/structs/" + struct_name.replace("LDK","") + ".java", "w") as out_java_trait:
1189             write_c("typedef struct " + struct_name + "_JCalls {\n")
1190             write_c("\tatomic_size_t refcnt;\n")
1191             write_c("\tJavaVM *vm;\n")
1192             write_c("\tjweak o;\n")
1193             field_var_convs = []
1194             for var_line in field_var_lines:
1195                 if var_line.group(1) in trait_structs:
1196                     write_c("\t" + var_line.group(1) + "_JCalls* " + var_line.group(2) + ";\n")
1197                     field_var_convs.append(None)
1198                 else:
1199                     field_var_convs.append(map_type(var_line.group(1) + " " + var_line.group(2), False, None, False, False))
1200             for fn_line in trait_fn_lines:
1201                 if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
1202                     write_c("\tjmethodID " + fn_line.group(2) + "_meth;\n")
1203             write_c("} " + struct_name + "_JCalls;\n")
1204
1205             out_java_trait.write(hu_struct_file_prefix)
1206             out_java_trait.write("public class " + struct_name.replace("LDK","") + " extends CommonBase {\n")
1207             out_java_trait.write("\tfinal bindings." + struct_name + " bindings_instance;\n")
1208             out_java_trait.write("\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); bindings_instance = null; }\n")
1209             out_java_trait.write("\tprivate " + struct_name.replace("LDK", "") + "(bindings." + struct_name + " arg")
1210             for idx, var_line in enumerate(field_var_lines):
1211                 if var_line.group(1) in trait_structs:
1212                     out_java_trait.write(", bindings." + var_line.group(1) + " " + var_line.group(2))
1213                 else:
1214                     out_java_trait.write(", " + field_var_convs[idx].java_hu_ty + " " + var_line.group(2))
1215             out_java_trait.write(") {\n")
1216             out_java_trait.write("\t\tsuper(bindings." + struct_name + "_new(arg")
1217             for idx, var_line in enumerate(field_var_lines):
1218                 if var_line.group(1) in trait_structs:
1219                     out_java_trait.write(", " + var_line.group(2))
1220                 elif field_var_convs[idx].from_hu_conv is not None:
1221                     out_java_trait.write(", " + field_var_convs[idx].from_hu_conv[0])
1222                 else:
1223                     out_java_trait.write(", " + var_line.group(2))
1224             out_java_trait.write("));\n")
1225             out_java_trait.write("\t\tthis.ptrs_to.add(arg);\n")
1226             for idx, var_line in enumerate(field_var_lines):
1227                 if var_line.group(1) in trait_structs:
1228                     out_java_trait.write("\t\tthis.ptrs_to.add(" + var_line.group(2) + ");\n")
1229                 elif field_var_convs[idx].from_hu_conv is not None and field_var_convs[idx].from_hu_conv[1] != "":
1230                     out_java_trait.write("\t\t" + field_var_convs[idx].from_hu_conv[1] + ";\n")
1231             out_java_trait.write("\t\tthis.bindings_instance = arg;\n")
1232             out_java_trait.write("\t}\n")
1233             out_java_trait.write("\t@Override @SuppressWarnings(\"deprecation\")\n")
1234             out_java_trait.write("\tprotected void finalize() throws Throwable {\n")
1235             out_java_trait.write("\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); } super.finalize();\n")
1236             out_java_trait.write("\t}\n\n")
1237
1238             java_trait_constr = "\tprivate static class " + struct_name + "Holder { " + struct_name.replace("LDK", "") + " held; }\n"
1239             java_trait_constr = java_trait_constr + "\tpublic static " + struct_name.replace("LDK", "") + " new_impl(" + struct_name.replace("LDK", "") + "Interface arg"
1240             for idx, var_line in enumerate(field_var_lines):
1241                 if var_line.group(1) in trait_structs:
1242                     # Ideally we'd be able to take any instance of the interface, but our C code can only represent
1243                     # Java-implemented version, so we require users pass a Java implementation here :/
1244                     java_trait_constr = java_trait_constr + ", " + var_line.group(1).replace("LDK", "") + "." + var_line.group(1).replace("LDK", "") + "Interface " + var_line.group(2) + "_impl"
1245                 else:
1246                     java_trait_constr = java_trait_constr + ", " + field_var_convs[idx].java_hu_ty + " " + var_line.group(2)
1247             java_trait_constr = java_trait_constr + ") {\n\t\tfinal " + struct_name + "Holder impl_holder = new " + struct_name + "Holder();\n"
1248             java_trait_constr = java_trait_constr + "\t\timpl_holder.held = new " + struct_name.replace("LDK", "") + "(new bindings." + struct_name + "() {\n"
1249             out_java_trait.write("\tpublic static interface " + struct_name.replace("LDK", "") + "Interface {\n")
1250             out_java.write("\tpublic interface " + struct_name + " {\n")
1251             java_meths = []
1252             for fn_line in trait_fn_lines:
1253                 java_meth_descr = "("
1254                 if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
1255                     ret_ty_info = map_type(fn_line.group(1), True, None, False, False)
1256
1257                     out_java.write("\t\t " + ret_ty_info.java_ty + " " + fn_line.group(2) + "(")
1258                     java_trait_constr = java_trait_constr + "\t\t\t@Override public " + ret_ty_info.java_ty + " " + fn_line.group(2) + "("
1259                     out_java_trait.write("\t\t" + ret_ty_info.java_hu_ty + " " + fn_line.group(2) + "(")
1260                     is_const = fn_line.group(3) is not None
1261                     write_c(fn_line.group(1) + fn_line.group(2) + "_jcall(")
1262                     if is_const:
1263                         write_c("const void* this_arg")
1264                     else:
1265                         write_c("void* this_arg")
1266
1267                     arg_names = []
1268                     for idx, arg in enumerate(fn_line.group(4).split(',')):
1269                         if arg == "":
1270                             continue
1271                         if idx >= 2:
1272                             out_java.write(", ")
1273                             java_trait_constr = java_trait_constr + ", "
1274                             out_java_trait.write(", ")
1275                         write_c(", ")
1276                         arg_conv_info = map_type(arg, True, None, False, False)
1277                         write_c(arg.strip())
1278                         out_java.write(arg_conv_info.java_ty + " " + arg_conv_info.arg_name)
1279                         out_java_trait.write(arg_conv_info.java_hu_ty + " " + arg_conv_info.arg_name)
1280                         java_trait_constr = java_trait_constr + arg_conv_info.java_ty + " " + arg_conv_info.arg_name
1281                         arg_names.append(arg_conv_info)
1282                         java_meth_descr = java_meth_descr + arg_conv_info.java_fn_ty_arg
1283                     java_meth_descr = java_meth_descr + ")" + ret_ty_info.java_fn_ty_arg
1284                     java_meths.append(java_meth_descr)
1285
1286                     out_java.write(");\n")
1287                     out_java_trait.write(");\n")
1288                     java_trait_constr = java_trait_constr + ") {\n"
1289                     write_c(") {\n")
1290                     write_c("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
1291                     write_c("\tJNIEnv *_env;\n")
1292                     write_c("\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&_env, JNI_VERSION_1_8) == JNI_OK);\n")
1293
1294                     for arg_info in arg_names:
1295                         if arg_info.ret_conv is not None:
1296                             write_c("\t" + arg_info.ret_conv[0].replace('\n', '\n\t'));
1297                             write_c(arg_info.arg_name)
1298                             write_c(arg_info.ret_conv[1].replace('\n', '\n\t') + "\n")
1299                         if arg_info.to_hu_conv is not None:
1300                             java_trait_constr = java_trait_constr + "\t\t\t\t" + arg_info.to_hu_conv.replace("\n", "\n\t\t\t\t") + "\n"
1301
1302                     write_c("\tjobject obj = (*_env)->NewLocalRef(_env, j_calls->o);\n\tCHECK(obj != NULL);\n")
1303                     if ret_ty_info.c_ty.endswith("Array"):
1304                         write_c("\t" + ret_ty_info.c_ty + " arg = (*_env)->CallObjectMethod(_env, obj, j_calls->" + fn_line.group(2) + "_meth")
1305                     elif not ret_ty_info.passed_as_ptr:
1306                         write_c("\treturn (*_env)->Call" + ret_ty_info.java_ty.title() + "Method(_env, obj, j_calls->" + fn_line.group(2) + "_meth")
1307                     else:
1308                         write_c("\t" + fn_line.group(1).strip() + "* ret = (" + fn_line.group(1).strip() + "*)(*_env)->CallLongMethod(_env, obj, j_calls->" + fn_line.group(2) + "_meth");
1309                     if ret_ty_info.java_ty != "void":
1310                         java_trait_constr = java_trait_constr + "\t\t\t\t" + ret_ty_info.java_hu_ty + " ret = arg." + fn_line.group(2) + "("
1311                     else:
1312                         java_trait_constr = java_trait_constr + "\t\t\t\targ." + fn_line.group(2) + "("
1313
1314                     for idx, arg_info in enumerate(arg_names):
1315                         if arg_info.ret_conv is not None:
1316                             write_c(", " + arg_info.ret_conv_name)
1317                         else:
1318                             write_c(", " + arg_info.arg_name)
1319                         if idx != 0:
1320                             java_trait_constr = java_trait_constr + ", "
1321                         if arg_info.to_hu_conv_name is not None:
1322                             java_trait_constr = java_trait_constr + arg_info.to_hu_conv_name
1323                         else:
1324                             java_trait_constr = java_trait_constr + arg_info.arg_name
1325                     write_c(");\n");
1326                     if ret_ty_info.arg_conv is not None:
1327                         write_c("\t" + ret_ty_info.arg_conv.replace("\n", "\n\t") + "\n\treturn " + ret_ty_info.arg_conv_name + ";\n")
1328
1329                     write_c("}\n")
1330                     java_trait_constr = java_trait_constr + ");\n"
1331                     if ret_ty_info.java_ty != "void":
1332                         if ret_ty_info.from_hu_conv is not None:
1333                             java_trait_constr = java_trait_constr + "\t\t\t\t" + ret_ty_info.java_ty + " result = " + ret_ty_info.from_hu_conv[0] + ";\n"
1334                             if ret_ty_info.from_hu_conv[1] != "":
1335                                 java_trait_constr = java_trait_constr + "\t\t\t\t" + ret_ty_info.from_hu_conv[1].replace("this", "impl_holder.held") + ";\n"
1336                             if ret_ty_info.rust_obj in result_types:
1337                                 # Avoid double-free by breaking the result - we should learn to clone these and then we can be safe instead
1338                                 java_trait_constr = java_trait_constr + "\t\t\t\tret.ptr = 0;\n"
1339                             java_trait_constr = java_trait_constr + "\t\t\t\treturn result;\n"
1340                         else:
1341                             java_trait_constr = java_trait_constr + "\t\t\t\treturn ret;\n"
1342                     java_trait_constr = java_trait_constr + "\t\t\t}\n"
1343                 elif fn_line.group(2) == "free":
1344                     write_c("static void " + struct_name + "_JCalls_free(void* this_arg) {\n")
1345                     write_c("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
1346                     write_c("\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n")
1347                     write_c("\t\tJNIEnv *env;\n")
1348                     write_c("\t\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_8) == JNI_OK);\n")
1349                     write_c("\t\t(*env)->DeleteWeakGlobalRef(env, j_calls->o);\n")
1350                     write_c("\t\tFREE(j_calls);\n")
1351                     write_c("\t}\n}\n")
1352             java_trait_constr = java_trait_constr + "\t\t}"
1353             for var_line in field_var_lines:
1354                 if var_line.group(1) in trait_structs:
1355                     java_trait_constr = java_trait_constr + ", " + var_line.group(2) + ".new_impl(" + var_line.group(2) + "_impl).bindings_instance"
1356                 else:
1357                     java_trait_constr = java_trait_constr + ", " + var_line.group(2)
1358             out_java_trait.write("\t}\n")
1359             out_java_trait.write(java_trait_constr + ");\n\t\treturn impl_holder.held;\n\t}\n")
1360
1361             # Write out a clone function whether we need one or not, as we use them in moving to rust
1362             write_c("static void* " + struct_name + "_JCalls_clone(const void* this_arg) {\n")
1363             write_c("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
1364             write_c("\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n")
1365             for var_line in field_var_lines:
1366                 if var_line.group(1) in trait_structs:
1367                     write_c("\tatomic_fetch_add_explicit(&j_calls->" + var_line.group(2) + "->refcnt, 1, memory_order_release);\n")
1368             write_c("\treturn (void*) this_arg;\n")
1369             write_c("}\n")
1370
1371             out_java.write("\t}\n")
1372
1373             out_java.write("\tpublic static native long " + struct_name + "_new(" + struct_name + " impl")
1374             write_c("static inline " + struct_name + " " + struct_name + "_init (JNIEnv * env, jclass _a, jobject o")
1375             for idx, var_line in enumerate(field_var_lines):
1376                 if var_line.group(1) in trait_structs:
1377                     out_java.write(", " + var_line.group(1) + " " + var_line.group(2))
1378                     write_c(", jobject " + var_line.group(2))
1379                 else:
1380                     out_java.write(", " + field_var_convs[idx].java_ty + " " + var_line.group(2))
1381                     write_c(", " + field_var_convs[idx].c_ty + " " + var_line.group(2))
1382             out_java.write(");\n")
1383             write_c(") {\n")
1384
1385             write_c("\tjclass c = (*env)->GetObjectClass(env, o);\n")
1386             write_c("\tCHECK(c != NULL);\n")
1387             write_c("\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n")
1388             write_c("\tatomic_init(&calls->refcnt, 1);\n")
1389             write_c("\tDO_ASSERT((*env)->GetJavaVM(env, &calls->vm) == 0);\n")
1390             write_c("\tcalls->o = (*env)->NewWeakGlobalRef(env, o);\n")
1391             for (fn_line, java_meth_descr) in zip(trait_fn_lines, java_meths):
1392                 if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
1393                     write_c("\tcalls->" + fn_line.group(2) + "_meth = (*env)->GetMethodID(env, c, \"" + fn_line.group(2) + "\", \"" + java_meth_descr + "\");\n")
1394                     write_c("\tCHECK(calls->" + fn_line.group(2) + "_meth != NULL);\n")
1395             for idx, var_line in enumerate(field_var_lines):
1396                 if field_var_convs[idx] is not None and field_var_convs[idx].arg_conv is not None:
1397                     write_c("\n\t" + field_var_convs[idx].arg_conv.replace("\n", "\n\t") +"\n")
1398             write_c("\n\t" + struct_name + " ret = {\n")
1399             write_c("\t\t.this_arg = (void*) calls,\n")
1400             for fn_line in trait_fn_lines:
1401                 if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
1402                     write_c("\t\t." + fn_line.group(2) + " = " + fn_line.group(2) + "_jcall,\n")
1403                 elif fn_line.group(2) == "free":
1404                     write_c("\t\t.free = " + struct_name + "_JCalls_free,\n")
1405                 else:
1406                     write_c("\t\t.clone = " + struct_name + "_JCalls_clone,\n")
1407             for idx, var_line in enumerate(field_var_lines):
1408                 if var_line.group(1) in trait_structs:
1409                     write_c("\t\t." + var_line.group(2) + " = " + var_line.group(1) + "_init(env, _a, " + var_line.group(2) + "),\n")
1410                 elif field_var_convs[idx].arg_conv_name is not None:
1411                     write_c("\t\t." + var_line.group(2) + " = " + field_var_convs[idx].arg_conv_name + ",\n")
1412                     write_c("\t\t.set_" + var_line.group(2) + " = NULL,\n")
1413                 else:
1414                     write_c("\t\t." + var_line.group(2) + " = " + var_line.group(2) + ",\n")
1415                     write_c("\t\t.set_" + var_line.group(2) + " = NULL,\n")
1416             write_c("\t};\n")
1417             for var_line in field_var_lines:
1418                 if var_line.group(1) in trait_structs:
1419                     write_c("\tcalls->" + var_line.group(2) + " = ret." + var_line.group(2) + ".this_arg;\n")
1420             write_c("\treturn ret;\n")
1421             write_c("}\n")
1422
1423             write_c("JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1new (JNIEnv * env, jclass _a, jobject o")
1424             for idx, var_line in enumerate(field_var_lines):
1425                 if var_line.group(1) in trait_structs:
1426                     write_c(", jobject " + var_line.group(2))
1427                 else:
1428                     write_c(", " + field_var_convs[idx].c_ty + " " + var_line.group(2))
1429             write_c(") {\n")
1430             write_c("\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n")
1431             write_c("\t*res_ptr = " + struct_name + "_init(env, _a, o")
1432             for var_line in field_var_lines:
1433                 write_c(", " + var_line.group(2))
1434             write_c(");\n")
1435             write_c("\treturn (long)res_ptr;\n")
1436             write_c("}\n")
1437
1438             out_java.write("\tpublic static native " + struct_name + " " + struct_name + "_get_obj_from_jcalls(long val);\n")
1439             write_c("JNIEXPORT jobject JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1get_1obj_1from_1jcalls (JNIEnv * env, jclass _a, jlong val) {\n")
1440             write_c("\tjobject ret = (*env)->NewLocalRef(env, ((" + struct_name + "_JCalls*)val)->o);\n")
1441             write_c("\tCHECK(ret != NULL);\n")
1442             write_c("\treturn ret;\n")
1443             write_c("}\n")
1444
1445         for fn_line in trait_fn_lines:
1446             # For now, just disable enabling the _call_log - we don't know how to inverse-map String
1447             is_log = fn_line.group(2) == "log" and struct_name == "LDKLogger"
1448             if fn_line.group(2) != "free" and fn_line.group(2) != "clone" and fn_line.group(2) != "eq" and not is_log:
1449                 dummy_line = fn_line.group(1) + struct_name.replace("LDK", "") + "_" + fn_line.group(2) + " " + struct_name + "* this_arg" + fn_line.group(4) + "\n"
1450                 map_fn(dummy_line, re.compile("([A-Za-z_0-9]*) *([A-Za-z_0-9]*) *(.*)").match(dummy_line), None, "(this_arg_conv->" + fn_line.group(2) + ")(this_arg_conv->this_arg")
1451         for idx, var_line in enumerate(field_var_lines):
1452             if var_line.group(1) not in trait_structs:
1453                 write_c(var_line.group(1) + " " + struct_name + "_set_get_" + var_line.group(2) + "(" + struct_name + "* this_arg) {\n")
1454                 write_c("\tif (this_arg->set_" + var_line.group(2) + " != NULL)\n")
1455                 write_c("\t\tthis_arg->set_" + var_line.group(2) + "(this_arg);\n")
1456                 write_c("\treturn this_arg->" + var_line.group(2) + ";\n")
1457                 write_c("}\n")
1458                 dummy_line = var_line.group(1) + " " + struct_name.replace("LDK", "") + "_get_" + var_line.group(2) + " " + struct_name + "* this_arg" + fn_line.group(4) + "\n"
1459                 map_fn(dummy_line, re.compile("([A-Za-z_0-9]*) *([A-Za-z_0-9]*) *(.*)").match(dummy_line), None, struct_name + "_set_get_" + var_line.group(2) + "(this_arg_conv")
1460
1461     out_java.write("""package org.ldk.impl;
1462 import org.ldk.enums.*;
1463
1464 public class bindings {
1465         public static class VecOrSliceDef {
1466                 public long dataptr;
1467                 public long datalen;
1468                 public long stride;
1469                 public VecOrSliceDef(long dataptr, long datalen, long stride) {
1470                         this.dataptr = dataptr; this.datalen = datalen; this.stride = stride;
1471                 }
1472         }
1473         static {
1474                 System.loadLibrary(\"lightningjni\");
1475                 init(java.lang.Enum.class, VecOrSliceDef.class);
1476                 init_class_cache();
1477         }
1478         static native void init(java.lang.Class c, java.lang.Class slicedef);
1479         static native void init_class_cache();
1480
1481         public static native boolean deref_bool(long ptr);
1482         public static native long deref_long(long ptr);
1483         public static native void free_heap_ptr(long ptr);
1484         public static native byte[] read_bytes(long ptr, long len);
1485         public static native byte[] get_u8_slice_bytes(long slice_ptr);
1486         public static native long bytes_to_u8_vec(byte[] bytes);
1487         public static native long new_txpointer_copy_data(byte[] txdata);
1488         public static native void txpointer_free(long ptr);
1489         public static native byte[] txpointer_get_buffer(long ptr);
1490         public static native long vec_slice_len(long vec);
1491         public static native long new_empty_slice_vec();
1492
1493 """)
1494     write_c("""
1495 static jmethodID ordinal_meth = NULL;
1496 static jmethodID slicedef_meth = NULL;
1497 static jclass slicedef_cls = NULL;
1498 JNIEXPORT void Java_org_ldk_impl_bindings_init(JNIEnv * env, jclass _b, jclass enum_class, jclass slicedef_class) {
1499         ordinal_meth = (*env)->GetMethodID(env, enum_class, "ordinal", "()I");
1500         CHECK(ordinal_meth != NULL);
1501         slicedef_meth = (*env)->GetMethodID(env, slicedef_class, "<init>", "(JJJ)V");
1502         CHECK(slicedef_meth != NULL);
1503         slicedef_cls = (*env)->NewGlobalRef(env, slicedef_class);
1504         CHECK(slicedef_cls != NULL);
1505 }
1506
1507 JNIEXPORT jboolean JNICALL Java_org_ldk_impl_bindings_deref_1bool (JNIEnv * env, jclass _a, jlong ptr) {
1508         return *((bool*)ptr);
1509 }
1510 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_deref_1long (JNIEnv * env, jclass _a, jlong ptr) {
1511         return *((long*)ptr);
1512 }
1513 JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_free_1heap_1ptr (JNIEnv * env, jclass _a, jlong ptr) {
1514         FREE((void*)ptr);
1515 }
1516 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_read_1bytes (JNIEnv * _env, jclass _b, jlong ptr, jlong len) {
1517         jbyteArray ret_arr = (*_env)->NewByteArray(_env, len);
1518         (*_env)->SetByteArrayRegion(_env, ret_arr, 0, len, (unsigned char*)ptr);
1519         return ret_arr;
1520 }
1521 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_get_1u8_1slice_1bytes (JNIEnv * _env, jclass _b, jlong slice_ptr) {
1522         LDKu8slice *slice = (LDKu8slice*)slice_ptr;
1523         jbyteArray ret_arr = (*_env)->NewByteArray(_env, slice->datalen);
1524         (*_env)->SetByteArrayRegion(_env, ret_arr, 0, slice->datalen, slice->data);
1525         return ret_arr;
1526 }
1527 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_bytes_1to_1u8_1vec (JNIEnv * _env, jclass _b, jbyteArray bytes) {
1528         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "LDKCVec_u8");
1529         vec->datalen = (*_env)->GetArrayLength(_env, bytes);
1530         vec->data = (uint8_t*)MALLOC(vec->datalen, "LDKCVec_u8Z Bytes");
1531         (*_env)->GetByteArrayRegion (_env, bytes, 0, vec->datalen, vec->data);
1532         return (long)vec;
1533 }
1534 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_txpointer_1get_1buffer (JNIEnv * env, jclass _b, jlong ptr) {
1535         LDKTransaction *txdata = (LDKTransaction*)ptr;
1536         LDKu8slice slice;
1537         slice.data = txdata->data;
1538         slice.datalen = txdata->datalen;
1539         return Java_org_ldk_impl_bindings_get_1u8_1slice_1bytes(env, _b, (long)&slice);
1540 }
1541 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_new_1txpointer_1copy_1data (JNIEnv * env, jclass _b, jbyteArray bytes) {
1542         LDKTransaction *txdata = (LDKTransaction*)MALLOC(sizeof(LDKTransaction), "LDKTransaction");
1543         txdata->datalen = (*env)->GetArrayLength(env, bytes);
1544         txdata->data = (uint8_t*)MALLOC(txdata->datalen, "Tx Data Bytes");
1545         txdata->data_is_owned = false;
1546         (*env)->GetByteArrayRegion (env, bytes, 0, txdata->datalen, txdata->data);
1547         return (long)txdata;
1548 }
1549 JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_txpointer_1free (JNIEnv * env, jclass _b, jlong ptr) {
1550         LDKTransaction *tx = (LDKTransaction*)ptr;
1551         tx->data_is_owned = true;
1552         Transaction_free(*tx);
1553         FREE((void*)ptr);
1554 }
1555 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_vec_1slice_1len (JNIEnv * env, jclass _a, jlong ptr) {
1556         // Check offsets of a few Vec types are all consistent as we're meant to be generic across types
1557         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_SignatureZ, datalen), "Vec<*> needs to be mapped identically");
1558         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_MessageSendEventZ, datalen), "Vec<*> needs to be mapped identically");
1559         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_EventZ, datalen), "Vec<*> needs to be mapped identically");
1560         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_C2Tuple_usizeTransactionZZ, datalen), "Vec<*> needs to be mapped identically");
1561         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)ptr;
1562         return (long)vec->datalen;
1563 }
1564 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_new_1empty_1slice_1vec (JNIEnv * _env, jclass _b) {
1565         // Check sizes of a few Vec types are all consistent as we're meant to be generic across types
1566         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_SignatureZ), "Vec<*> needs to be mapped identically");
1567         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_MessageSendEventZ), "Vec<*> needs to be mapped identically");
1568         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_EventZ), "Vec<*> needs to be mapped identically");
1569         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_C2Tuple_usizeTransactionZZ), "Vec<*> needs to be mapped identically");
1570         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "Empty LDKCVec");
1571         vec->data = NULL;
1572         vec->datalen = 0;
1573         return (long)vec;
1574 }
1575
1576 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
1577 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
1578 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
1579 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
1580
1581 """)
1582
1583     with open(sys.argv[3] + "/structs/CommonBase.java", "a") as out_java_struct:
1584         out_java_struct.write("""package org.ldk.structs;
1585 import java.util.LinkedList;
1586 class CommonBase {
1587         long ptr;
1588         LinkedList<Object> ptrs_to = new LinkedList();
1589         protected CommonBase(long ptr) { this.ptr = ptr; }
1590         public long _test_only_get_ptr() { return this.ptr; }
1591 }
1592 """)
1593
1594     in_block_comment = False
1595     cur_block_obj = None
1596
1597     const_val_regex = re.compile("^extern const ([A-Za-z_0-9]*) ([A-Za-z_0-9]*);$")
1598
1599     line_indicates_result_regex = re.compile("^   (LDKCResultPtr_[A-Za-z_0-9]*) contents;$")
1600     line_indicates_vec_regex = re.compile("^   ([A-Za-z_0-9]*) \*data;$")
1601     line_indicates_opaque_regex = re.compile("^   bool is_owned;$")
1602     line_indicates_trait_regex = re.compile("^   ([A-Za-z_0-9]* \*?)\(\*([A-Za-z_0-9]*)\)\((const )?void \*this_arg(.*)\);$")
1603     assert(line_indicates_trait_regex.match("   uintptr_t (*send_data)(void *this_arg, LDKu8slice data, bool resume_read);"))
1604     assert(line_indicates_trait_regex.match("   LDKCVec_MessageSendEventZ (*get_and_clear_pending_msg_events)(const void *this_arg);"))
1605     assert(line_indicates_trait_regex.match("   void *(*clone)(const void *this_arg);"))
1606     line_field_var_regex = re.compile("^   ([A-Za-z_0-9]*) ([A-Za-z_0-9]*);$")
1607     assert(line_field_var_regex.match("   LDKMessageSendEventsProvider MessageSendEventsProvider;"))
1608     assert(line_field_var_regex.match("   LDKChannelPublicKeys pubkeys;"))
1609     struct_name_regex = re.compile("^typedef (struct|enum|union) (MUST_USE_STRUCT )?(LDK[A-Za-z_0-9]*) {$")
1610     assert(struct_name_regex.match("typedef struct LDKCVecTempl_u8 {"))
1611     assert(struct_name_regex.match("typedef enum LDKNetwork {"))
1612     struct_alias_regex = re.compile("^typedef (LDK[A-Za-z_0-9]*) (LDK[A-Za-z_0-9]*);$")
1613     assert(struct_alias_regex.match("typedef LDKCResultTempl_bool__PeerHandleError LDKCResult_boolPeerHandleErrorZ;"))
1614
1615     result_templ_structs = set()
1616     union_enum_items = {}
1617     result_ptr_struct_items = {}
1618     for line in in_h:
1619         if in_block_comment:
1620             if line.endswith("*/\n"):
1621                 in_block_comment = False
1622         elif cur_block_obj is not None:
1623             cur_block_obj  = cur_block_obj + line
1624             if line.startswith("} "):
1625                 field_lines = []
1626                 struct_name = None
1627                 vec_ty = None
1628                 obj_lines = cur_block_obj.split("\n")
1629                 is_opaque = False
1630                 result_contents = None
1631                 is_unitary_enum = False
1632                 is_union_enum = False
1633                 is_union = False
1634                 is_tuple = False
1635                 trait_fn_lines = []
1636                 field_var_lines = []
1637
1638                 for idx, struct_line in enumerate(obj_lines):
1639                     if struct_line.strip().startswith("/*"):
1640                         in_block_comment = True
1641                     if in_block_comment:
1642                         if struct_line.endswith("*/"):
1643                             in_block_comment = False
1644                     else:
1645                         struct_name_match = struct_name_regex.match(struct_line)
1646                         if struct_name_match is not None:
1647                             struct_name = struct_name_match.group(3)
1648                             if struct_name_match.group(1) == "enum":
1649                                 if not struct_name.endswith("_Tag"):
1650                                     is_unitary_enum = True
1651                                 else:
1652                                     is_union_enum = True
1653                             elif struct_name_match.group(1) == "union":
1654                                 is_union = True
1655                         if line_indicates_opaque_regex.match(struct_line):
1656                             is_opaque = True
1657                         result_match = line_indicates_result_regex.match(struct_line)
1658                         if result_match is not None:
1659                             result_contents = result_match.group(1)
1660                         vec_ty_match = line_indicates_vec_regex.match(struct_line)
1661                         if vec_ty_match is not None and struct_name.startswith("LDKCVecTempl_"):
1662                             vec_ty = vec_ty_match.group(1)
1663                         elif struct_name.startswith("LDKC2TupleTempl_") or struct_name.startswith("LDKC3TupleTempl_"):
1664                             is_tuple = True
1665                         trait_fn_match = line_indicates_trait_regex.match(struct_line)
1666                         if trait_fn_match is not None:
1667                             trait_fn_lines.append(trait_fn_match)
1668                         field_var_match = line_field_var_regex.match(struct_line)
1669                         if field_var_match is not None:
1670                             field_var_lines.append(field_var_match)
1671                         field_lines.append(struct_line)
1672
1673                 assert(struct_name is not None)
1674                 assert(len(trait_fn_lines) == 0 or not (is_opaque or is_unitary_enum or is_union_enum or is_union or result_contents is not None or vec_ty is not None))
1675                 assert(not is_opaque or not (len(trait_fn_lines) != 0 or is_unitary_enum or is_union_enum or is_union or result_contents is not None or vec_ty is not None))
1676                 assert(not is_unitary_enum or not (len(trait_fn_lines) != 0 or is_opaque or is_union_enum or is_union or result_contents is not None or vec_ty is not None))
1677                 assert(not is_union_enum or not (len(trait_fn_lines) != 0 or is_unitary_enum or is_opaque or is_union or result_contents is not None or vec_ty is not None))
1678                 assert(not is_union or not (len(trait_fn_lines) != 0 or is_unitary_enum or is_union_enum or is_opaque or result_contents is not None or vec_ty is not None))
1679                 assert(result_contents is None 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))
1680                 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 result_contents is not None))
1681
1682                 if is_opaque:
1683                     opaque_structs.add(struct_name)
1684                     with open(sys.argv[3] + "/structs/" + struct_name.replace("LDK","") + ".java", "w") as out_java_struct:
1685                         out_java_struct.write(hu_struct_file_prefix)
1686                         out_java_struct.write("public class " + struct_name.replace("LDK","") + " extends CommonBase")
1687                         if struct_name.startswith("LDKLocked"):
1688                             out_java_struct.write(" implements AutoCloseable")
1689                         out_java_struct.write(" {\n")
1690                         out_java_struct.write("\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); }\n")
1691                         if struct_name.startswith("LDKLocked"):
1692                             out_java_struct.write("\t@Override public void close() {\n")
1693                         else:
1694                             out_java_struct.write("\t@Override @SuppressWarnings(\"deprecation\")\n")
1695                             out_java_struct.write("\tprotected void finalize() throws Throwable {\n")
1696                             out_java_struct.write("\t\tsuper.finalize();\n")
1697                         out_java_struct.write("\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); }\n")
1698                         out_java_struct.write("\t}\n\n")
1699                 elif result_contents is not None:
1700                     result_templ_structs.add(struct_name)
1701                     assert result_contents in result_ptr_struct_items
1702                 elif struct_name.startswith("LDKCResultPtr_"):
1703                     for line in field_lines:
1704                         if line.endswith("*result;"):
1705                             res_ty = line[:-8].strip()
1706                         elif line.endswith("*err;"):
1707                             err_ty = line[:-5].strip()
1708                     result_ptr_struct_items[struct_name] = (res_ty, err_ty)
1709                 elif is_tuple:
1710                     out_java.write("\tpublic static native long " + struct_name + "_new(")
1711                     write_c("JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1new(JNIEnv *_env, jclass _b")
1712                     ty_list = []
1713                     for idx, line in enumerate(field_lines):
1714                         if idx != 0 and idx < len(field_lines) - 2:
1715                             ty_info = java_c_types(line.strip(';'), None)
1716                             if idx != 1:
1717                                 out_java.write(", ")
1718                             e = chr(ord('a') + idx - 1)
1719                             out_java.write(ty_info.java_ty + " " + e)
1720                             write_c(", " + ty_info.c_ty + " " + e)
1721                             ty_list.append(ty_info)
1722                     tuple_types[struct_name] = (ty_list, struct_name)
1723                     out_java.write(");\n")
1724                     write_c(") {\n")
1725                     write_c("\t" + struct_name + "* ret = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n")
1726                     for idx, line in enumerate(field_lines):
1727                         if idx != 0 and idx < len(field_lines) - 2:
1728                             ty_info = map_type(line.strip(';'), False, None, False, False)
1729                             e = chr(ord('a') + idx - 1)
1730                             if ty_info.arg_conv is not None:
1731                                 write_c("\t" + ty_info.arg_conv.replace("\n", "\n\t"))
1732                                 write_c("\n\tret->" + e + " = " + ty_info.arg_conv_name + ";\n")
1733                             else:
1734                                 write_c("\tret->" + e + " = " + e + ";\n")
1735                             if ty_info.arg_conv_cleanup is not None:
1736                                 write_c("\t//TODO: Really need to call " + ty_info.arg_conv_cleanup + " here\n")
1737                     write_c("\treturn (long)ret;\n")
1738                     write_c("}\n")
1739                 elif vec_ty is not None:
1740                     if vec_ty in opaque_structs:
1741                         out_java.write("\tpublic static native long[] " + struct_name + "_arr_info(long vec_ptr);\n")
1742                         write_c("JNIEXPORT jlongArray JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1arr_1info(JNIEnv *env, jclass _b, jlong ptr) {\n")
1743                     else:
1744                         out_java.write("\tpublic static native VecOrSliceDef " + struct_name + "_arr_info(long vec_ptr);\n")
1745                         write_c("JNIEXPORT jobject JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1arr_1info(JNIEnv *env, jclass _b, jlong ptr) {\n")
1746                     write_c("\t" + struct_name + " *vec = (" + struct_name + "*)ptr;\n")
1747                     if vec_ty in opaque_structs:
1748                         write_c("\tjlongArray ret = (*env)->NewLongArray(env, vec->datalen);\n")
1749                         write_c("\tjlong *ret_elems = (*env)->GetPrimitiveArrayCritical(env, ret, NULL);\n")
1750                         write_c("\tfor (size_t i = 0; i < vec->datalen; i++) {\n")
1751                         write_c("\t\tCHECK((((long)vec->data[i].inner) & 1) == 0);\n")
1752                         write_c("\t\tret_elems[i] = (long)vec->data[i].inner | (vec->data[i].is_owned ? 1 : 0);\n")
1753                         write_c("\t}\n")
1754                         write_c("\t(*env)->ReleasePrimitiveArrayCritical(env, ret, ret_elems, 0);\n")
1755                         write_c("\treturn ret;\n")
1756                     else:
1757                         write_c("\treturn (*env)->NewObject(env, slicedef_cls, slicedef_meth, (long)vec->data, (long)vec->datalen, sizeof(" + vec_ty + "));\n")
1758                     write_c("}\n")
1759
1760                     ty_info = map_type(vec_ty + " arr_elem", False, None, False, False)
1761                     if len(ty_info.java_fn_ty_arg) == 1: # ie we're a primitive of some form
1762                         out_java.write("\tpublic static native long " + struct_name + "_new(" + ty_info.java_ty + "[] elems);\n")
1763                         write_c("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")
1764                         write_c("\t" + struct_name + " *ret = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n")
1765                         write_c("\tret->datalen = (*env)->GetArrayLength(env, elems);\n")
1766                         write_c("\tif (ret->datalen == 0) {\n")
1767                         write_c("\t\tret->data = NULL;\n")
1768                         write_c("\t} else {\n")
1769                         write_c("\t\tret->data = MALLOC(sizeof(" + vec_ty + ") * ret->datalen, \"" + struct_name + " Data\");\n")
1770                         write_c("\t\t" + ty_info.c_ty + " *java_elems = (*env)->GetPrimitiveArrayCritical(env, elems, NULL);\n")
1771                         write_c("\t\tfor (size_t i = 0; i < ret->datalen; i++) {\n")
1772                         if ty_info.arg_conv is not None:
1773                             write_c("\t\t\t" + ty_info.c_ty + " arr_elem = java_elems[i];\n")
1774                             write_c("\t\t\t" + ty_info.arg_conv.replace("\n", "\n\t\t\t") + "\n")
1775                             write_c("\t\t\tret->data[i] = " + ty_info.arg_conv_name + ";\n")
1776                             assert ty_info.arg_conv_cleanup is None
1777                         else:
1778                             write_c("\t\t\tret->data[i] = java_elems[i];\n")
1779                         write_c("\t\t}\n")
1780                         write_c("\t\t(*env)->ReleasePrimitiveArrayCritical(env, elems, java_elems, 0);\n")
1781                         write_c("\t}\n")
1782                         write_c("\treturn (long)ret;\n")
1783                         write_c("}\n")
1784                 elif is_union_enum:
1785                     assert(struct_name.endswith("_Tag"))
1786                     struct_name = struct_name[:-4]
1787                     union_enum_items[struct_name] = {"field_lines": field_lines}
1788                 elif struct_name.endswith("_Body") and struct_name.split("_")[0] in union_enum_items:
1789                     enum_var_name = struct_name.split("_")
1790                     union_enum_items[enum_var_name[0]][enum_var_name[1]] = field_lines
1791                 elif struct_name in union_enum_items:
1792                     map_complex_enum(struct_name, union_enum_items[struct_name])
1793                 elif is_unitary_enum:
1794                     map_unitary_enum(struct_name, field_lines)
1795                 elif len(trait_fn_lines) > 0:
1796                     trait_structs.add(struct_name)
1797                     map_trait(struct_name, field_var_lines, trait_fn_lines)
1798                 elif struct_name == "LDKTxOut":
1799                     with open(sys.argv[3] + "/structs/TxOut.java", "w") as out_java_struct:
1800                         out_java_struct.write(hu_struct_file_prefix)
1801                         out_java_struct.write("public class TxOut extends CommonBase{\n")
1802                         out_java_struct.write("\tTxOut(java.lang.Object _dummy, long ptr) { super(ptr); }\n")
1803                         out_java_struct.write("\tlong to_c_ptr() { return 0; }\n")
1804                         # TODO: TxOut body
1805                         out_java_struct.write("}")
1806                 else:
1807                     pass # Everything remaining is a byte[] or some form
1808                 cur_block_obj = None
1809         else:
1810             fn_ptr = fn_ptr_regex.match(line)
1811             fn_ret_arr = fn_ret_arr_regex.match(line)
1812             reg_fn = reg_fn_regex.match(line)
1813             const_val = const_val_regex.match(line)
1814
1815             if line.startswith("#include <"):
1816                 pass
1817             elif line.startswith("/*"):
1818                 #out_java.write("\t" + line)
1819                 if not line.endswith("*/\n"):
1820                     in_block_comment = True
1821             elif line.startswith("typedef enum "):
1822                 cur_block_obj = line
1823             elif line.startswith("typedef struct "):
1824                 cur_block_obj = line
1825             elif line.startswith("typedef union "):
1826                 cur_block_obj = line
1827             elif line.startswith("typedef "):
1828                 alias_match =  struct_alias_regex.match(line)
1829                 if alias_match.group(1) in tuple_types:
1830                     tuple_types[alias_match.group(2)] = (tuple_types[alias_match.group(1)][0], alias_match.group(2))
1831                     tuple_types[alias_match.group(1)] = (tuple_types[alias_match.group(1)][0], alias_match.group(2))
1832                     for idx, ty_info in enumerate(tuple_types[alias_match.group(1)][0]):
1833                         e = chr(ord('a') + idx)
1834                         out_java.write("\tpublic static native " + ty_info.java_ty + " " + alias_match.group(2) + "_get_" + e + "(long ptr);\n")
1835                         write_c("JNIEXPORT " + ty_info.c_ty + " JNICALL Java_org_ldk_impl_bindings_" + alias_match.group(2).replace("_", "_1") + "_1get_1" + e + "(JNIEnv *_env, jclass _b, jlong ptr) {\n")
1836                         write_c("\t" + alias_match.group(1) + " *tuple = (" + alias_match.group(1) + "*)ptr;\n")
1837                         conv_info = map_type_with_info(ty_info, False, None, False, True)
1838                         if conv_info.ret_conv is not None:
1839                             write_c("\t" + conv_info.ret_conv[0].replace("\n", "\n\t") + "tuple->" + e + conv_info.ret_conv[1].replace("\n", "\n\t") + "\n")
1840                             write_c("\treturn " + conv_info.ret_conv_name + ";\n")
1841                         else:
1842                             write_c("\treturn tuple->" + e + ";\n")
1843                         write_c("}\n")
1844                 elif alias_match.group(1) in result_templ_structs:
1845                     result_types.add(alias_match.group(2))
1846                     human_ty = alias_match.group(2).replace("LDKCResult", "Result")
1847                     with open(sys.argv[3] + "/structs/" + human_ty + ".java", "w") as out_java_struct:
1848                         out_java_struct.write(hu_struct_file_prefix)
1849                         out_java_struct.write("public class " + human_ty + " extends CommonBase {\n")
1850                         out_java_struct.write("\tprivate " + human_ty + "(Object _dummy, long ptr) { super(ptr); }\n")
1851                         out_java_struct.write("\tprotected void finalize() throws Throwable {\n")
1852                         out_java_struct.write("\t\tif (ptr != 0) { bindings." + alias_match.group(2).replace("LDK","") + "_free(ptr); } super.finalize();\n")
1853                         out_java_struct.write("\t}\n\n")
1854                         out_java_struct.write("\tstatic " + human_ty + " constr_from_ptr(long ptr) {\n")
1855                         out_java_struct.write("\t\tif (bindings." + alias_match.group(2) + "_result_ok(ptr)) {\n")
1856                         out_java_struct.write("\t\t\treturn new " + human_ty + "_OK(null, ptr);\n")
1857                         out_java_struct.write("\t\t} else {\n")
1858                         out_java_struct.write("\t\t\treturn new " + human_ty + "_Err(null, ptr);\n")
1859                         out_java_struct.write("\t\t}\n")
1860                         out_java_struct.write("\t}\n")
1861
1862                         contents_ty = alias_match.group(1).replace("LDKCResultTempl", "LDKCResultPtr")
1863                         res_ty, err_ty = result_ptr_struct_items[contents_ty]
1864                         res_map = map_type(res_ty + " res", True, None, False, True)
1865                         err_map = map_type(err_ty + " err", True, None, False, True)
1866
1867                         out_java.write("\tpublic static native boolean " + alias_match.group(2) + "_result_ok(long arg);\n")
1868                         write_c("JNIEXPORT jboolean JNICALL Java_org_ldk_impl_bindings_" + alias_match.group(2).replace("_", "_1") + "_1result_1ok (JNIEnv * env, jclass _a, jlong arg) {\n")
1869                         write_c("\treturn ((" + alias_match.group(2) + "*)arg)->result_ok;\n")
1870                         write_c("}\n")
1871
1872                         out_java.write("\tpublic static native " + res_map.java_ty + " " + alias_match.group(2) + "_get_ok(long arg);\n")
1873                         write_c("JNIEXPORT " + res_map.c_ty + " JNICALL Java_org_ldk_impl_bindings_" + alias_match.group(2).replace("_", "_1") + "_1get_1ok (JNIEnv * _env, jclass _a, jlong arg) {\n")
1874                         write_c("\t" + alias_match.group(2) + " *val = (" + alias_match.group(2) + "*)arg;\n")
1875                         write_c("\tCHECK(val->result_ok);\n\t")
1876                         out_java_struct.write("\tpublic static final class " + human_ty + "_OK extends " + human_ty + " {\n")
1877                         if res_map.ret_conv is not None:
1878                             write_c(res_map.ret_conv[0].replace("\n", "\n\t") + "(*val->contents.result)")
1879                             write_c(res_map.ret_conv[1].replace("\n", "\n\t") + "\n\treturn " + res_map.ret_conv_name)
1880                         else:
1881                             write_c("return *val->contents.result")
1882                         write_c(";\n}\n")
1883
1884                         out_java_struct.write("\t\tpublic final " + res_map.java_hu_ty + " res;\n")
1885                         out_java_struct.write("\t\tprivate " + human_ty + "_OK(Object _dummy, long ptr) {\n")
1886                         out_java_struct.write("\t\t\tsuper(_dummy, ptr);\n")
1887                         if res_map.to_hu_conv is not None:
1888                             out_java_struct.write("\t\t\t" + res_map.java_ty + " res = bindings." + alias_match.group(2) + "_get_ok(ptr);\n")
1889                             out_java_struct.write("\t\t\t" + res_map.to_hu_conv.replace("\n", "\n\t\t\t"))
1890                             out_java_struct.write("\n\t\t\tthis.res = " + res_map.to_hu_conv_name + ";\n")
1891                         else:
1892                             out_java_struct.write("\t\t\tthis.res = bindings." + alias_match.group(2) + "_get_ok(ptr);\n")
1893                         out_java_struct.write("\t\t}\n")
1894                         if alias_match.group(2).startswith("LDKCResult_None"):
1895                             out_java_struct.write("\t\tpublic " + human_ty + "_OK() {\n\t\t\tthis(null, bindings.C" + human_ty + "_ok());\n")
1896                         else:
1897                             out_java_struct.write("\t\tpublic " + human_ty + "_OK(" + res_map.java_hu_ty + " res) {\n")
1898                             if res_map.from_hu_conv is not None:
1899                                 out_java_struct.write("\t\t\tthis(null, bindings.C" + human_ty + "_ok(" + res_map.from_hu_conv[0] + "));\n")
1900                                 if res_map.from_hu_conv[1] != "":
1901                                     out_java_struct.write("\t\t\t" + res_map.from_hu_conv[1] + ";\n")
1902                             else:
1903                                 out_java_struct.write("\t\t\tthis(null, bindings.C" + human_ty + "_ok(res));\n")
1904                         out_java_struct.write("\t\t}\n\t}\n\n")
1905
1906                         out_java.write("\tpublic static native " + err_map.java_ty + " " + alias_match.group(2) + "_get_err(long arg);\n")
1907                         write_c("JNIEXPORT " + err_map.c_ty + " JNICALL Java_org_ldk_impl_bindings_" + alias_match.group(2).replace("_", "_1") + "_1get_1err (JNIEnv * _env, jclass _a, jlong arg) {\n")
1908                         write_c("\t" + alias_match.group(2) + " *val = (" + alias_match.group(2) + "*)arg;\n")
1909                         write_c("\tCHECK(!val->result_ok);\n\t")
1910                         out_java_struct.write("\tpublic static final class " + human_ty + "_Err extends " + human_ty + " {\n")
1911                         if err_map.ret_conv is not None:
1912                             write_c(err_map.ret_conv[0].replace("\n", "\n\t") + "(*val->contents.err)")
1913                             write_c(err_map.ret_conv[1].replace("\n", "\n\t") + "\n\treturn " + err_map.ret_conv_name)
1914                         else:
1915                             write_c("return *val->contents.err")
1916                         write_c(";\n}\n")
1917
1918                         out_java_struct.write("\t\tpublic final " + err_map.java_hu_ty + " err;\n")
1919                         out_java_struct.write("\t\tprivate " + human_ty + "_Err(Object _dummy, long ptr) {\n")
1920                         out_java_struct.write("\t\t\tsuper(_dummy, ptr);\n")
1921                         if err_map.to_hu_conv is not None:
1922                             out_java_struct.write("\t\t\t" + err_map.java_ty + " err = bindings." + alias_match.group(2) + "_get_err(ptr);\n")
1923                             out_java_struct.write("\t\t\t" + err_map.to_hu_conv.replace("\n", "\n\t\t\t"))
1924                             out_java_struct.write("\n\t\t\tthis.err = " + err_map.to_hu_conv_name + ";\n")
1925                         else:
1926                             out_java_struct.write("\t\t\tthis.err = bindings." + alias_match.group(2) + "_get_err(ptr);\n")
1927                         out_java_struct.write("\t\t}\n")
1928
1929                         if alias_match.group(2).endswith("NoneZ"):
1930                             out_java_struct.write("\t\tpublic " + human_ty + "_Err() {\n\t\t\tthis(null, bindings.C" + human_ty + "_err());\n")
1931                         else:
1932                             out_java_struct.write("\t\tpublic " + human_ty + "_Err(" + err_map.java_hu_ty + " err) {\n")
1933                             if err_map.from_hu_conv is not None:
1934                                 out_java_struct.write("\t\t\tthis(null, bindings.C" + human_ty + "_err(" + err_map.from_hu_conv[0] + "));\n")
1935                                 if err_map.from_hu_conv[1] != "":
1936                                     out_java_struct.write("\t\t\t" + err_map.from_hu_conv[1] + ";\n")
1937                             else:
1938                                 out_java_struct.write("\t\t\tthis(null, bindings.C" + human_ty + "_err(err));\n")
1939                         out_java_struct.write("\t\t}\n\t}\n}\n")
1940             elif fn_ptr is not None:
1941                 map_fn(line, fn_ptr, None, None)
1942             elif fn_ret_arr is not None:
1943                 map_fn(line, fn_ret_arr, fn_ret_arr.group(4), None)
1944             elif reg_fn is not None:
1945                 map_fn(line, reg_fn, None, None)
1946             elif const_val_regex is not None:
1947                 # TODO Map const variables
1948                 pass
1949             else:
1950                 assert(line == "\n")
1951
1952     out_java.write("}\n")
1953     for struct_name in opaque_structs:
1954         with open(sys.argv[3] + "/structs/" + struct_name.replace("LDK","") + ".java", "a") as out_java_struct:
1955             out_java_struct.write("}\n")
1956     for struct_name in trait_structs:
1957         with open(sys.argv[3] + "/structs/" + struct_name.replace("LDK","") + ".java", "a") as out_java_struct:
1958             out_java_struct.write("}\n")
1959 with open(sys.argv[4], "w") as out_c:
1960     out_c.write(c_file_pfx)
1961     for ty in c_array_class_caches:
1962         if ty + "_clz" in c_file:
1963             out_c.write("static jclass " + ty + "_clz = NULL;\n")
1964     out_c.write("JNIEXPORT void Java_org_ldk_impl_bindings_init_1class_1cache(JNIEnv * env, jclass _b) {\n")
1965     for ty in c_array_class_caches:
1966         if ty + "_clz" in c_file:
1967             out_c.write("\t" + ty + "_clz = (*env)->FindClass(env, \"" + ty.replace("arr_of_", "[") + "\");\n")
1968             out_c.write("\tCHECK(" + ty + "_clz != NULL);\n")
1969             out_c.write("\t" + ty + "_clz = (*env)->NewGlobalRef(env, " + ty + "_clz);\n")
1970     out_c.write("}\n")
1971     out_c.write(c_file)