_ 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         alloc_freed(ptr);
 119         __real_free(ptr);
 120 }
 121
 122 void* __real_realloc(void* ptr, size_t newlen);
 123 void* __wrap_realloc(void* ptr, size_t len) {
 124         alloc_freed(ptr);
 125         void* res = __real_realloc(ptr, len);
 126         new_allocation(res, "realloc call");
 127         return res;
 128 }
 129 void __wrap_reallocarray(void* ptr, size_t new_sz) {
 130         // Rust doesn't seem to use reallocarray currently
 131         assert(false);
 132 }
 133
 134 void __attribute__((destructor)) check_leaks() {
 135         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 136                 fprintf(stderr, "%s %p remains:\\n", a->struct_name, a->ptr);
 137                 backtrace_symbols_fd(a->bt, a->bt_len, STDERR_FILENO);
 138                 fprintf(stderr, "\\n\\n");
 139         }
 140         DO_ASSERT(allocation_ll == NULL);
 141 }
 142 """
 143
 144 c_file = ""
 145 def write_c(s):
 146     global c_file
 147     c_file += s
 148
 149 class TypeInfo:
 150     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):
 151         self.is_native_primitive = is_native_primitive
 152         self.rust_obj = rust_obj
 153         self.java_ty = java_ty
 154         self.java_hu_ty = java_hu_ty
 155         self.java_fn_ty_arg = java_fn_ty_arg
 156         self.c_ty = c_ty
 157         self.passed_as_ptr = passed_as_ptr
 158         self.is_ptr = is_ptr
 159         self.var_name = var_name
 160         self.arr_len = arr_len
 161         self.arr_access = arr_access
 162         self.subty = subty
 163         self.pass_by_ref = is_ptr
 164
 165 class ConvInfo:
 166     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):
 167         assert(ty_info.c_ty is not None)
 168         assert(ty_info.java_ty is not None)
 169         assert(arg_name is not None)
 170         self.passed_as_ptr = ty_info.passed_as_ptr
 171         self.rust_obj = ty_info.rust_obj
 172         self.c_ty = ty_info.c_ty
 173         self.java_ty = ty_info.java_ty
 174         self.java_hu_ty = ty_info.java_hu_ty
 175         self.java_fn_ty_arg = ty_info.java_fn_ty_arg
 176         self.arg_name = arg_name
 177         self.arg_conv = arg_conv
 178         self.arg_conv_name = arg_conv_name
 179         self.arg_conv_cleanup = arg_conv_cleanup
 180         self.ret_conv = ret_conv
 181         self.ret_conv_name = ret_conv_name
 182         self.to_hu_conv = to_hu_conv
 183         self.to_hu_conv_name = to_hu_conv_name
 184         self.from_hu_conv = from_hu_conv
 185
 186     def print_ty(self):
 187         write_c(self.c_ty)
 188         out_java.write(self.java_ty)
 189
 190     def print_name(self):
 191         if self.arg_name != "":
 192             out_java.write(" " + self.arg_name)
 193             write_c(" " + self.arg_name)
 194         else:
 195             out_java.write(" arg")
 196             write_c(" arg")
 197
 198 def camel_to_snake(s):
 199     # Convert camel case to snake case, in a way that appears to match cbindgen
 200     con = "_"
 201     ret = ""
 202     lastchar = ""
 203     lastund = False
 204     for char in s:
 205         if lastchar.isupper():
 206             if not char.isupper() and not lastund:
 207                 ret = ret + "_"
 208                 lastund = True
 209             else:
 210                 lastund = False
 211             ret = ret + lastchar.lower()
 212         else:
 213             ret = ret + lastchar
 214             if char.isupper() and not lastund:
 215                 ret = ret + "_"
 216                 lastund = True
 217             else:
 218                 lastund = False
 219         lastchar = char
 220         if char.isnumeric():
 221             lastund = True
 222     return (ret + lastchar.lower()).strip("_")
 223
 224 unitary_enums = set()
 225 complex_enums = set()
 226 opaque_structs = set()
 227 trait_structs = set()
 228 result_types = set()
 229 tuple_types = {}
 230
 231 def is_common_base_ext(struct_name):
 232     return struct_name in complex_enums or struct_name in opaque_structs or struct_name in trait_structs or struct_name in result_types
 233
 234 var_is_arr_regex = re.compile("\(\*([A-za-z0-9_]*)\)\[([a-z0-9]*)\]")
 235 var_ty_regex = re.compile("([A-za-z_0-9]*)(.*)")
 236 java_c_types_none_allowed = True # Unset when we do the real pass that populates the above sets
 237 def java_c_types(fn_arg, ret_arr_len):
 238     fn_arg = fn_arg.strip()
 239     if fn_arg.startswith("MUST_USE_RES "):
 240         fn_arg = fn_arg[13:]
 241     is_const = False
 242     if fn_arg.startswith("const "):
 243         fn_arg = fn_arg[6:]
 244         is_const = True
 245
 246     is_ptr = False
 247     take_by_ptr = False
 248     rust_obj = None
 249     arr_access = None
 250     java_hu_ty = None
 251     if fn_arg.startswith("LDKThirtyTwoBytes"):
 252         fn_arg = "uint8_t (*" + fn_arg[18:] + ")[32]"
 253         assert var_is_arr_regex.match(fn_arg[8:])
 254         rust_obj = "LDKThirtyTwoBytes"
 255         arr_access = "data"
 256     elif fn_arg.startswith("LDKPublicKey"):
 257         fn_arg = "uint8_t (*" + fn_arg[13:] + ")[33]"
 258         assert var_is_arr_regex.match(fn_arg[8:])
 259         rust_obj = "LDKPublicKey"
 260         arr_access = "compressed_form"
 261     elif fn_arg.startswith("LDKSecretKey"):
 262         fn_arg = "uint8_t (*" + fn_arg[13:] + ")[32]"
 263         assert var_is_arr_regex.match(fn_arg[8:])
 264         rust_obj = "LDKSecretKey"
 265         arr_access = "bytes"
 266     elif fn_arg.startswith("LDKSignature"):
 267         fn_arg = "uint8_t (*" + fn_arg[13:] + ")[64]"
 268         assert var_is_arr_regex.match(fn_arg[8:])
 269         rust_obj = "LDKSignature"
 270         arr_access = "compact_form"
 271     elif fn_arg.startswith("LDKThreeBytes"):
 272         fn_arg = "uint8_t (*" + fn_arg[14:] + ")[3]"
 273         assert var_is_arr_regex.match(fn_arg[8:])
 274         rust_obj = "LDKThreeBytes"
 275         arr_access = "data"
 276     elif fn_arg.startswith("LDKFourBytes"):
 277         fn_arg = "uint8_t (*" + fn_arg[13:] + ")[4]"
 278         assert var_is_arr_regex.match(fn_arg[8:])
 279         rust_obj = "LDKFourBytes"
 280         arr_access = "data"
 281     elif fn_arg.startswith("LDKSixteenBytes"):
 282         fn_arg = "uint8_t (*" + fn_arg[16:] + ")[16]"
 283         assert var_is_arr_regex.match(fn_arg[8:])
 284         rust_obj = "LDKSixteenBytes"
 285         arr_access = "data"
 286     elif fn_arg.startswith("LDKTenBytes"):
 287         fn_arg = "uint8_t (*" + fn_arg[12:] + ")[10]"
 288         assert var_is_arr_regex.match(fn_arg[8:])
 289         rust_obj = "LDKTenBytes"
 290         arr_access = "data"
 291     elif fn_arg.startswith("LDKu8slice"):
 292         fn_arg = "uint8_t (*" + fn_arg[11:] + ")[datalen]"
 293         assert var_is_arr_regex.match(fn_arg[8:])
 294         rust_obj = "LDKu8slice"
 295         arr_access = "data"
 296     elif fn_arg.startswith("LDKCVecTempl_u8") or fn_arg.startswith("LDKCVec_u8Z"):
 297         if fn_arg.startswith("LDKCVecTempl_u8"):
 298             fn_arg = "uint8_t (*" + fn_arg[16:] + ")[datalen]"
 299             rust_obj = "LDKCVecTempl_u8"
 300             assert var_is_arr_regex.match(fn_arg[8:])
 301         else:
 302             fn_arg = "uint8_t (*" + fn_arg[12:] + ")[datalen]"
 303             rust_obj = "LDKCVec_u8Z"
 304             assert var_is_arr_regex.match(fn_arg[8:])
 305         arr_access = "data"
 306     elif fn_arg.startswith("LDKCVecTempl_") or fn_arg.startswith("LDKCVec_"):
 307         is_ptr = False
 308         if "*" in fn_arg:
 309             fn_arg = fn_arg.replace("*", "")
 310             is_ptr = True
 311
 312         if fn_arg.startswith("LDKCVec_"):
 313             tyn = fn_arg[8:].split(" ")
 314             assert tyn[0].endswith("Z")
 315             if tyn[0] == "u64Z":
 316                 new_arg = "uint64_t"
 317             else:
 318                 new_arg = "LDK" + tyn[0][:-1]
 319             for a in tyn[1:]:
 320                 new_arg = new_arg + " " + a
 321             res = java_c_types(new_arg, ret_arr_len)
 322         else:
 323             res = java_c_types("LDK" + fn_arg[13:], ret_arr_len)
 324         if res is None:
 325             assert java_c_types_none_allowed
 326             return None
 327         if is_ptr:
 328             res.pass_by_ref = True
 329         if res.is_native_primitive or res.passed_as_ptr:
 330             return TypeInfo(rust_obj=fn_arg.split(" ")[0], java_ty=res.java_ty + "[]", java_hu_ty=res.java_hu_ty + "[]",
 331                 java_fn_ty_arg="[" + res.java_fn_ty_arg, c_ty=res.c_ty + "Array", passed_as_ptr=False, is_ptr=is_ptr,
 332                 var_name=res.var_name, arr_len="datalen", arr_access="data", subty=res, is_native_primitive=False)
 333         else:
 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="jobjectArray", 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
 338     is_primitive = False
 339     arr_len = None
 340     if fn_arg.startswith("void"):
 341         java_ty = "void"
 342         c_ty = "void"
 343         fn_ty_arg = "V"
 344         fn_arg = fn_arg[4:].strip()
 345         is_primitive = True
 346     elif fn_arg.startswith("bool"):
 347         java_ty = "boolean"
 348         c_ty = "jboolean"
 349         fn_ty_arg = "Z"
 350         fn_arg = fn_arg[4:].strip()
 351         is_primitive = True
 352     elif fn_arg.startswith("uint8_t"):
 353         java_ty = "byte"
 354         c_ty = "jbyte"
 355         fn_ty_arg = "B"
 356         fn_arg = fn_arg[7:].strip()
 357         is_primitive = True
 358     elif fn_arg.startswith("uint16_t"):
 359         java_ty = "short"
 360         c_ty = "jshort"
 361         fn_ty_arg = "S"
 362         fn_arg = fn_arg[8:].strip()
 363         is_primitive = True
 364     elif fn_arg.startswith("uint32_t"):
 365         java_ty = "int"
 366         c_ty = "jint"
 367         fn_ty_arg = "I"
 368         fn_arg = fn_arg[8:].strip()
 369         is_primitive = True
 370     elif fn_arg.startswith("uint64_t") or fn_arg.startswith("uintptr_t"):
 371         java_ty = "long"
 372         c_ty = "jlong"
 373         fn_ty_arg = "J"
 374         if fn_arg.startswith("uint64_t"):
 375             fn_arg = fn_arg[8:].strip()
 376         else:
 377             fn_arg = fn_arg[9:].strip()
 378         is_primitive = True
 379     elif is_const and fn_arg.startswith("char *"):
 380         java_ty = "String"
 381         c_ty = "const char*"
 382         fn_ty_arg = "Ljava/lang/String;"
 383         fn_arg = fn_arg[6:].strip()
 384     elif fn_arg.startswith("LDKStr"):
 385         java_ty = "String"
 386         c_ty = "jstring"
 387         fn_ty_arg = "Ljava/lang/String;"
 388         fn_arg = fn_arg[6:].strip()
 389         arr_access = "chars"
 390         arr_len = "len"
 391     else:
 392         ma = var_ty_regex.match(fn_arg)
 393         if ma.group(1).strip() in unitary_enums:
 394             java_ty = ma.group(1).strip()
 395             c_ty = "jclass"
 396             fn_ty_arg = "Lorg/ldk/enums/" + ma.group(1).strip() + ";"
 397             fn_arg = ma.group(2).strip()
 398             rust_obj = ma.group(1).strip()
 399             take_by_ptr = True
 400         elif ma.group(1).strip().startswith("LDKC2Tuple"):
 401             java_ty = "long"
 402             java_hu_ty = "TwoTuple<"
 403             if not ma.group(1).strip() in tuple_types:
 404                 assert java_c_types_none_allowed
 405                 return None
 406             for idx, ty_info in enumerate(tuple_types[ma.group(1).strip()][0]):
 407                 if idx != 0:
 408                     java_hu_ty = java_hu_ty + ", "
 409                 if ty_info.is_native_primitive:
 410                     java_hu_ty = java_hu_ty + ty_info.java_hu_ty.title() # If we're a primitive, capitalize the first letter
 411                 else:
 412                     java_hu_ty = java_hu_ty + ty_info.java_hu_ty
 413             java_hu_ty = java_hu_ty + ">"
 414             c_ty = "jlong"
 415             fn_ty_arg = "J"
 416             fn_arg = ma.group(2).strip()
 417             rust_obj = ma.group(1).strip()
 418             take_by_ptr = True
 419         elif ma.group(1).strip().startswith("LDKC3Tuple"):
 420             java_ty = "long"
 421             java_hu_ty = "ThreeTuple<"
 422             if not ma.group(1).strip() in tuple_types:
 423                 assert java_c_types_none_allowed
 424                 return None
 425             for idx, ty_info in enumerate(tuple_types[ma.group(1).strip()][0]):
 426                 if idx != 0:
 427                     java_hu_ty = java_hu_ty + ", "
 428                 if ty_info.is_native_primitive:
 429                     java_hu_ty = java_hu_ty + ty_info.java_hu_ty.title() # If we're a primitive, capitalize the first letter
 430                 else:
 431                     java_hu_ty = java_hu_ty + ty_info.java_hu_ty
 432             java_hu_ty = java_hu_ty + ">"
 433             c_ty = "jlong"
 434             fn_ty_arg = "J"
 435             fn_arg = ma.group(2).strip()
 436             rust_obj = ma.group(1).strip()
 437             take_by_ptr = True
 438         else:
 439             java_ty = "long"
 440             java_hu_ty = ma.group(1).strip().replace("LDKCResult", "Result").replace("LDK", "")
 441             c_ty = "jlong"
 442             fn_ty_arg = "J"
 443             fn_arg = ma.group(2).strip()
 444             rust_obj = ma.group(1).strip()
 445             take_by_ptr = True
 446
 447     if fn_arg.startswith(" *") or fn_arg.startswith("*"):
 448         fn_arg = fn_arg.replace("*", "").strip()
 449         is_ptr = True
 450         c_ty = "jlong"
 451         java_ty = "long"
 452         fn_ty_arg = "J"
 453         is_primitive = False
 454
 455     var_is_arr = var_is_arr_regex.match(fn_arg)
 456     if var_is_arr is not None or ret_arr_len is not None:
 457         assert(not take_by_ptr)
 458         assert(not is_ptr)
 459         java_ty = java_ty + "[]"
 460         c_ty = c_ty + "Array"
 461         if var_is_arr is not None:
 462             if var_is_arr.group(1) == "":
 463                 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,
 464                     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)
 465             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,
 466                 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)
 467
 468     if java_hu_ty is None:
 469         java_hu_ty = java_ty
 470     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,
 471         is_ptr=is_ptr, var_name=fn_arg, arr_len=arr_len, arr_access=arr_access, is_native_primitive=is_primitive)
 472
 473 fn_ptr_regex = re.compile("^extern const ([A-Za-z_0-9\* ]*) \(\*(.*)\)\((.*)\);$")
 474 fn_ret_arr_regex = re.compile("(.*) \(\*(.*)\((.*)\)\)\[([0-9]*)\];$")
 475 reg_fn_regex = re.compile("([A-Za-z_0-9\* ]* \*?)([a-zA-Z_0-9]*)\((.*)\);$")
 476 clone_fns = set()
 477 constructor_fns = {}
 478 c_array_class_caches = set()
 479 with open(sys.argv[1]) as in_h:
 480     for line in in_h:
 481         reg_fn = reg_fn_regex.match(line)
 482         if reg_fn is not None:
 483             if reg_fn.group(2).endswith("_clone"):
 484                 clone_fns.add(reg_fn.group(2))
 485             else:
 486                 rty = java_c_types(reg_fn.group(1), None)
 487                 if rty is not None and rty.rust_obj is not None and reg_fn.group(2) == rty.java_hu_ty + "_new":
 488                     constructor_fns[rty.rust_obj] = reg_fn.group(3)
 489             continue
 490         arr_fn = fn_ret_arr_regex.match(line)
 491         if arr_fn is not None:
 492             if arr_fn.group(2).endswith("_clone"):
 493                 clone_fns.add(arr_fn.group(2))
 494             # No object constructors return arrays, as then they wouldn't be an object constructor
 495             continue
 496 java_c_types_none_allowed = False # C structs created by cbindgen are declared in dependency order
 497
 498 with open(sys.argv[1]) as in_h, open(sys.argv[2], "w") as out_java:
 499     def map_type(fn_arg, print_void, ret_arr_len, is_free, holds_ref):
 500         ty_info = java_c_types(fn_arg, ret_arr_len)
 501         return map_type_with_info(ty_info, print_void, ret_arr_len, is_free, holds_ref)
 502
 503     def map_type_with_info(ty_info, print_void, ret_arr_len, is_free, holds_ref):
 504         if ty_info.c_ty == "void":
 505             if not print_void:
 506                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 507                     arg_conv = None, arg_conv_name = None, arg_conv_cleanup = None,
 508                     ret_conv = None, ret_conv_name = None, to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 509         if ty_info.c_ty.endswith("Array"):
 510             arr_len = ty_info.arr_len
 511             if arr_len is not None:
 512                 arr_name = ty_info.var_name
 513             else:
 514                 arr_name = "ret"
 515                 arr_len = ret_arr_len
 516             if ty_info.c_ty == "jbyteArray":
 517                 ret_conv = ("jbyteArray " + arr_name + "_arr = (*_env)->NewByteArray(_env, " + arr_len + ");\n" + "(*_env)->SetByteArrayRegion(_env, " + arr_name + "_arr, 0, " + arr_len + ", ", "")
 518                 arg_conv_cleanup = None
 519                 if not arr_len.isdigit():
 520                     arg_conv = ty_info.rust_obj + " " + arr_name + "_ref;\n"
 521                     arg_conv = arg_conv + arr_name + "_ref." + ty_info.arr_access + " = (*_env)->GetByteArrayElements (_env, " + arr_name + ", NULL);\n"
 522                     arg_conv = arg_conv + arr_name + "_ref." + arr_len + " = (*_env)->GetArrayLength (_env, " + arr_name + ");"
 523                     arg_conv_cleanup = "(*_env)->ReleaseByteArrayElements(_env, " + arr_name + ", (int8_t*)" + arr_name + "_ref." + ty_info.arr_access + ", 0);"
 524                     ret_conv = (ty_info.rust_obj + " " + arr_name + "_var = ", "")
 525                     ret_conv = (ret_conv[0], ";\njbyteArray " + arr_name + "_arr = (*_env)->NewByteArray(_env, " + arr_name + "_var." + arr_len + ");\n")
 526                     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 + ");")
 527                     if not holds_ref and ty_info.rust_obj == "LDKCVec_u8Z":
 528                         ret_conv = (ret_conv[0], ret_conv[1] + "\nCVec_u8Z_free(" + arr_name + "_var);")
 529                 elif ty_info.rust_obj is not None:
 530                     arg_conv = ty_info.rust_obj + " " + arr_name + "_ref;\n"
 531                     arg_conv = arg_conv + "CHECK((*_env)->GetArrayLength (_env, " + arr_name + ") == " + arr_len + ");\n"
 532                     arg_conv = arg_conv + "(*_env)->GetByteArrayRegion (_env, " + arr_name + ", 0, " + arr_len + ", " + arr_name + "_ref." + ty_info.arr_access + ");"
 533                     ret_conv = (ret_conv[0], "." + ty_info.arr_access + ");")
 534                 else:
 535                     arg_conv = "unsigned char " + arr_name + "_arr[" + arr_len + "];\n"
 536                     arg_conv = arg_conv + "CHECK((*_env)->GetArrayLength (_env, " + arr_name + ") == " + arr_len + ");\n"
 537                     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;"
 538                     ret_conv = (ret_conv[0] + "*", ");")
 539                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 540                     arg_conv = arg_conv, arg_conv_name = arr_name + "_ref", arg_conv_cleanup = arg_conv_cleanup,
 541                     ret_conv = ret_conv, ret_conv_name = arr_name + "_arr", to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 542             else:
 543                 assert not arr_len.isdigit() # fixed length arrays not implemented
 544                 assert ty_info.java_ty[len(ty_info.java_ty) - 2:] == "[]"
 545                 conv_name = "arr_conv_" + str(len(ty_info.java_hu_ty))
 546                 idxc = chr(ord('a') + (len(ty_info.java_hu_ty) % 26))
 547                 ty_info.subty.var_name = conv_name
 548                 ty_info.subty.passed_as_ptr = False
 549                 subty = map_type_with_info(ty_info.subty, False, None, is_free, holds_ref)
 550                 if arr_name == "":
 551                     arr_name = "arg"
 552                 arg_conv = ty_info.rust_obj + " " + arr_name + "_constr;\n"
 553                 arg_conv = arg_conv + arr_name + "_constr." + arr_len + " = (*_env)->GetArrayLength (_env, " + arr_name + ");\n"
 554                 arg_conv = arg_conv + "if (" + arr_name + "_constr." + arr_len + " > 0)\n"
 555                 if subty.rust_obj is None:
 556                     szof = subty.c_ty
 557                 else:
 558                     szof = subty.rust_obj
 559                 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"
 560                 arg_conv = arg_conv + "else\n"
 561                 arg_conv = arg_conv + "\t" + arr_name + "_constr." + ty_info.arr_access + " = NULL;\n"
 562                 if not ty_info.java_ty[:len(ty_info.java_ty) - 2].endswith("[]"):
 563                     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"
 564                 arg_conv = arg_conv + "for (size_t " + idxc + " = 0; " + idxc + " < " + arr_name + "_constr." + arr_len + "; " + idxc + "++) {\n"
 565                 if not ty_info.java_ty[:len(ty_info.java_ty) - 2].endswith("[]"):
 566                     arg_conv = arg_conv + "\t" + ty_info.java_ty.strip("[]") + " " + conv_name + " = " + arr_name + "_vals[" + idxc + "];"
 567                     if subty.arg_conv is not None:
 568                         arg_conv = arg_conv + "\n\t" + subty.arg_conv.replace("\n", "\n\t")
 569                 else:
 570                     arg_conv = arg_conv + "\tjobject " + conv_name + " = (*_env)->GetObjectArrayElement(_env, " + arr_name + ", " + idxc + ");\n"
 571                     arg_conv = arg_conv + "\t" + subty.arg_conv.replace("\n", "\n\t")
 572                 arg_conv = arg_conv + "\n\t" + arr_name + "_constr." + ty_info.arr_access + "[" + idxc + "] = " + subty.arg_conv_name + ";\n}"
 573                 if not ty_info.java_ty[:len(ty_info.java_ty) - 2].endswith("[]"):
 574                     arg_conv = arg_conv + "\n(*_env)->Release" + ty_info.java_ty.strip("[]").title() + "ArrayElements (_env, " + arr_name + ", " + arr_name + "_vals, 0);"
 575                 if ty_info.is_ptr:
 576                     arg_conv_name = "&" + arr_name + "_constr"
 577                 else:
 578                     arg_conv_name = arr_name + "_constr"
 579                 arg_conv_cleanup = None
 580                 if ty_info.is_ptr:
 581                     arg_conv_cleanup = "FREE(" + arr_name + "_constr." + ty_info.arr_access + ");"
 582
 583                 if arr_name == "arg":
 584                     arr_name = "ret"
 585                 ret_conv = (ty_info.rust_obj + " " + arr_name + "_var = ", "")
 586                 if subty.ret_conv is None:
 587                     ret_conv = ("DUMMY", "DUMMY")
 588                 elif not ty_info.java_ty[:len(ty_info.java_ty) - 2].endswith("[]"):
 589                     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")
 590                     ret_conv = (ret_conv[0], ret_conv[1] + subty.c_ty + " *" + arr_name + "_arr_ptr = (*_env)->GetPrimitiveArrayCritical(_env, " + arr_name + "_arr, NULL);\n")
 591                     ret_conv = (ret_conv[0], ret_conv[1] + "for (size_t " + idxc + " = 0; " + idxc + " < " + arr_name + "_var." + arr_len + "; " + idxc + "++) {\n")
 592                     ret_conv = (ret_conv[0], ret_conv[1] + "\t" + subty.ret_conv[0].replace("\n", "\n\t"))
 593                     ret_conv = (ret_conv[0], ret_conv[1] + arr_name + "_var." + ty_info.arr_access + "[" + idxc + "]" + subty.ret_conv[1].replace("\n", "\n\t"))
 594                     ret_conv = (ret_conv[0], ret_conv[1] + "\n\t" + arr_name + "_arr_ptr[" + idxc + "] = " + subty.ret_conv_name + ";\n")
 595                     ret_conv = (ret_conv[0], ret_conv[1] + "}\n(*_env)->ReleasePrimitiveArrayCritical(_env, " + arr_name + "_arr, " + arr_name + "_arr_ptr, 0);")
 596                 else:
 597                     assert ty_info.java_fn_ty_arg.startswith("[")
 598                     clz_var = ty_info.java_fn_ty_arg[1:].replace("[", "arr_of_")
 599                     c_array_class_caches.add(clz_var)
 600                     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")
 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(*_env)->SetObjectArrayElement(_env, " + arr_name + "_arr, " + idxc + ", " + subty.ret_conv_name + ");\n")
 605                     ret_conv = (ret_conv[0], ret_conv[1] + "}")
 606                 if not holds_ref:
 607                     if subty.rust_obj is not None and subty.rust_obj in opaque_structs:
 608                         ret_conv = (ret_conv[0], ret_conv[1] + "\nFREE(" + arr_name + "_var." + ty_info.arr_access + ");")
 609                     else:
 610                         ret_conv = (ret_conv[0], ret_conv[1] + "\n" + ty_info.rust_obj.replace("LDK", "") + "_free(" + arr_name + "_var);")
 611
 612                 to_hu_conv = None
 613                 to_hu_conv_name = None
 614                 if subty.to_hu_conv is not None:
 615                     to_hu_conv = ty_info.java_hu_ty + " " + conv_name + "_arr = new " + ty_info.subty.java_hu_ty.split("<")[0] + "[" + arr_name + ".length];\n"
 616                     to_hu_conv = to_hu_conv + "for (int " + idxc + " = 0; " + idxc + " < " + arr_name + ".length; " + idxc + "++) {\n"
 617                     to_hu_conv = to_hu_conv + "\t" + subty.java_ty + " " + conv_name + " = " + arr_name + "[" + idxc + "];\n"
 618                     to_hu_conv = to_hu_conv + "\t" + subty.to_hu_conv.replace("\n", "\n\t") + "\n"
 619                     to_hu_conv = to_hu_conv + "\t" + conv_name + "_arr[" + idxc + "] = " + subty.to_hu_conv_name + ";\n}"
 620                     to_hu_conv_name = conv_name + "_arr"
 621                 from_hu_conv = None
 622                 if subty.from_hu_conv is not None:
 623                     if subty.java_ty == "long" and subty.java_hu_ty != "long":
 624                         from_hu_conv = ("Arrays.stream(" + arr_name + ").mapToLong(" + conv_name + " -> " + subty.from_hu_conv[0] + ").toArray()", "/* TODO 2 " + subty.java_hu_ty + "  */")
 625                     elif subty.java_ty == "long":
 626                         from_hu_conv = ("Arrays.stream(" + arr_name + ").map(" + conv_name + " -> " + subty.from_hu_conv[0] + ").toArray()", "/* TODO 2 " + subty.java_hu_ty + "  */")
 627                     else:
 628                         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 + "  */")
 629
 630                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 631                     arg_conv = arg_conv, arg_conv_name = arg_conv_name, arg_conv_cleanup = arg_conv_cleanup,
 632                     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)
 633         elif ty_info.java_ty == "String":
 634             if ty_info.arr_access is None:
 635                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 636                     arg_conv = None, arg_conv_name = None, arg_conv_cleanup = None,
 637                     ret_conv = ("jstring " + ty_info.var_name + "_conv = (*_env)->NewStringUTF(_env, ", ");"), ret_conv_name = ty_info.var_name + "_conv",
 638                     to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 639             else:
 640                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 641                     arg_conv = None, arg_conv_name = None, arg_conv_cleanup = None,
 642                     ret_conv = ("LDKStr " + ty_info.var_name + "_str = ",
 643                         ";\nchar* " + ty_info.var_name + "_buf = MALLOC(" + ty_info.var_name + "_str." + ty_info.arr_len + " + 1, \"str conv buf\");\n" +
 644                         "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" +
 645                         ty_info.var_name + "_buf[" + ty_info.var_name + "_str." + ty_info.arr_len + "] = 0;\n" +
 646                         "jstring " + ty_info.var_name + "_conv = (*_env)->NewStringUTF(_env, " + ty_info.var_name + "_str." + ty_info.arr_access + ");\n" +
 647                         "FREE(" + ty_info.var_name + "_buf);"),
 648                     ret_conv_name = ty_info.var_name + "_conv", to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 649         elif ty_info.var_name == "" and not print_void:
 650             # We don't have a parameter name, and want one, just call it arg
 651             if ty_info.rust_obj is not None:
 652                 assert(not is_free or ty_info.rust_obj not in opaque_structs)
 653                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 654                     arg_conv = ty_info.rust_obj + " arg_conv = *(" + ty_info.rust_obj + "*)arg;\nFREE((void*)arg);",
 655                     arg_conv_name = "arg_conv", arg_conv_cleanup = None,
 656                     ret_conv = None, ret_conv_name = None, to_hu_conv = "TODO 7", to_hu_conv_name = None, from_hu_conv = None)
 657             else:
 658                 assert(not is_free)
 659                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 660                     arg_conv = None, arg_conv_name = "arg", arg_conv_cleanup = None,
 661                     ret_conv = None, ret_conv_name = None, to_hu_conv = "TODO 8", to_hu_conv_name = None, from_hu_conv = None)
 662         elif ty_info.rust_obj is None:
 663             return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 664                 arg_conv = None, arg_conv_name = ty_info.var_name, arg_conv_cleanup = None,
 665                 ret_conv = None, ret_conv_name = None, to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 666         else:
 667             if ty_info.var_name == "":
 668                 ty_info.var_name = "ret"
 669             opaque_arg_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv;\n"
 670             opaque_arg_conv = opaque_arg_conv + ty_info.var_name + "_conv.inner = (void*)(" + ty_info.var_name + " & (~1));\n"
 671             if holds_ref:
 672                 opaque_arg_conv = opaque_arg_conv + ty_info.var_name + "_conv.is_owned = false;"
 673             else:
 674                 opaque_arg_conv = opaque_arg_conv + ty_info.var_name + "_conv.is_owned = (" + ty_info.var_name + " & 1) || (" + ty_info.var_name + " == 0);"
 675             if not ty_info.is_ptr and not is_free and not ty_info.pass_by_ref and not holds_ref:
 676                 if (ty_info.java_hu_ty + "_clone") in clone_fns:
 677                     # 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.
 678                     opaque_arg_conv = opaque_arg_conv + "\nif (" + ty_info.var_name + "_conv.inner != NULL)\n"
 679                     opaque_arg_conv = opaque_arg_conv + "\t" + ty_info.var_name + "_conv = " + ty_info.java_hu_ty + "_clone(&" + ty_info.var_name + "_conv);"
 680                 elif ty_info.passed_as_ptr:
 681                     opaque_arg_conv = opaque_arg_conv + "\n// Warning: we may need a move here but can't clone!"
 682             if not ty_info.is_ptr:
 683                 if ty_info.rust_obj in unitary_enums:
 684                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 685                         arg_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv = " + ty_info.rust_obj + "_from_java(_env, " + ty_info.var_name + ");",
 686                         arg_conv_name = ty_info.var_name + "_conv",
 687                         arg_conv_cleanup = None,
 688                         ret_conv = ("jclass " + ty_info.var_name + "_conv = " + ty_info.rust_obj + "_to_java(_env, ", ");"),
 689                         ret_conv_name = ty_info.var_name + "_conv", to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 690                 if ty_info.rust_obj in opaque_structs:
 691                     ret_conv_suf = ";\nCHECK((((long)" + ty_info.var_name + "_var.inner) & 1) == 0); // We rely on a free low bit, malloc guarantees this.\n"
 692                     ret_conv_suf = ret_conv_suf + "CHECK((((long)&" + ty_info.var_name + "_var) & 1) == 0); // We rely on a free low bit, pointer alignment guarantees this.\n"
 693                     if holds_ref:
 694                         ret_conv_suf = ret_conv_suf + "long " + ty_info.var_name + "_ref = (long)" + ty_info.var_name + "_var.inner & ~1;"
 695                     else:
 696                         ret_conv_suf = ret_conv_suf + "long " + ty_info.var_name + "_ref = (long)" + ty_info.var_name + "_var.inner;\n"
 697                         ret_conv_suf = ret_conv_suf + "if (" + ty_info.var_name + "_var.is_owned) {\n"
 698                         ret_conv_suf = ret_conv_suf + "\t" + ty_info.var_name + "_ref |= 1;\n"
 699                         ret_conv_suf = ret_conv_suf + "}"
 700                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 701                         arg_conv = opaque_arg_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 702                         ret_conv = (ty_info.rust_obj + " " + ty_info.var_name + "_var = ", ret_conv_suf),
 703                         ret_conv_name = ty_info.var_name + "_ref",
 704                         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 + ");",
 705                         to_hu_conv_name = ty_info.var_name + "_hu_conv",
 706                         from_hu_conv = (ty_info.var_name + " == null ? 0 : " + ty_info.var_name + ".ptr & ~1", "this.ptrs_to.add(" + ty_info.var_name + ")"))
 707                 base_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv = *(" + ty_info.rust_obj + "*)" + ty_info.var_name + ";";
 708                 if ty_info.rust_obj in trait_structs:
 709                     if not is_free:
 710                         base_conv = base_conv + "\nif (" + ty_info.var_name + "_conv.free == " + ty_info.rust_obj + "_JCalls_free) {\n"
 711                         base_conv = base_conv + "\t// If this_arg is a JCalls struct, then we need to increment the refcnt in it.\n"
 712                         base_conv = base_conv + "\t" + ty_info.rust_obj + "_JCalls_clone(" + ty_info.var_name + "_conv.this_arg);\n}"
 713                     else:
 714                         base_conv = base_conv + "\n" + "FREE((void*)" + ty_info.var_name + ");"
 715                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 716                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 717                         ret_conv = (ty_info.rust_obj + "* ret = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n*ret = ", ";"),
 718                         ret_conv_name = "(long)ret",
 719                         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);",
 720                         to_hu_conv_name = "ret_hu_conv",
 721                         from_hu_conv = (ty_info.var_name + " == null ? 0 : " + ty_info.var_name + ".ptr", "this.ptrs_to.add(" + ty_info.var_name + ")"))
 722                 if ty_info.rust_obj != "LDKu8slice" and ty_info.rust_obj != "LDKTransaction":
 723                     # Don't bother free'ing slices passed in - Rust doesn't auto-free the
 724                     # underlying unlike Vecs, and it gives Java more freedom.
 725                     base_conv = base_conv + "\nFREE((void*)" + ty_info.var_name + ");";
 726                 if ty_info.rust_obj in complex_enums:
 727                     ret_conv = ("long " + ty_info.var_name + "_ref = (long)&", ";")
 728                     if not holds_ref:
 729                         ret_conv = (ty_info.rust_obj + " *" + ty_info.var_name + "_copy = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n", "")
 730                         if not ty_info.passed_as_ptr:
 731                             # We use passed_as_ptr as a flag to detect if we're copying a Vec.
 732                             if (ty_info.java_hu_ty + "_clone") in clone_fns:
 733                                 ret_conv = (ret_conv[0] + "*" + ty_info.var_name + "_copy = " + ty_info.java_hu_ty + "_clone(&", ");\n")
 734                             else:
 735                                 ret_conv = (ret_conv[0] + "*" + ty_info.var_name + "_copy = ", "; // XXX: We likely need to clone here, but no _clone fn is available!\n")
 736                         else:
 737                             ret_conv = (ret_conv[0] + "*" + ty_info.var_name + "_copy = ", ";\n")
 738                         ret_conv = (ret_conv[0], ret_conv[1] + "long " + ty_info.var_name + "_ref = (long)" + ty_info.var_name + "_copy;")
 739                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 740                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 741                         ret_conv = ret_conv, ret_conv_name = ty_info.var_name + "_ref",
 742                         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);",
 743                         to_hu_conv_name = ty_info.var_name + "_hu_conv", from_hu_conv = (ty_info.var_name + ".ptr", ""))
 744                 if ty_info.rust_obj in result_types:
 745                     assert not ty_info.is_ptr and not holds_ref # Otherwise we shouldn't be MALLOC'ing
 746                     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 = ", ";")
 747                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 748                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 749                         ret_conv = ret_conv, ret_conv_name = "(long)" + ty_info.var_name + "_conv",
 750                         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);",
 751                         to_hu_conv_name = ty_info.var_name + "_hu_conv", from_hu_conv = (ty_info.var_name + " != null ? " + ty_info.var_name + ".ptr : 0", ""))
 752                 if ty_info.rust_obj in tuple_types:
 753                     from_hu_conv = "bindings." + tuple_types[ty_info.rust_obj][1].replace("LDK", "") + "_new("
 754                     to_hu_conv_pfx = ""
 755                     to_hu_conv_sfx = ty_info.java_hu_ty + " " + ty_info.var_name + "_conv = new " + ty_info.java_hu_ty + "("
 756                     for idx, conv in enumerate(tuple_types[ty_info.rust_obj][0]):
 757                         if idx != 0:
 758                             to_hu_conv_sfx = to_hu_conv_sfx + ", "
 759                             from_hu_conv = from_hu_conv + ", "
 760                         conv.var_name = ty_info.var_name + "_" + chr(idx + ord("a"))
 761                         conv_map = map_type_with_info(conv, False, None, is_free, holds_ref)
 762                         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"
 763                         if conv_map.to_hu_conv is not None:
 764                             to_hu_conv_pfx = to_hu_conv_pfx + conv_map.to_hu_conv + ";\n"
 765                             to_hu_conv_sfx = to_hu_conv_sfx + conv_map.to_hu_conv_name
 766                         else:
 767                             to_hu_conv_sfx = to_hu_conv_sfx + ty_info.var_name + "_" + chr(idx + ord("a"))
 768                         if conv_map.from_hu_conv is not None:
 769                             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")))
 770                             if conv_map.from_hu_conv[1] != "":
 771                                 from_hu_conv = from_hu_conv + "/*XXX: " + conv_map.from_hu_conv[1] + "*/"
 772                         else:
 773                             from_hu_conv = from_hu_conv + ty_info.var_name + "." + chr(idx + ord("a"))
 774
 775                     if not ty_info.is_ptr and not holds_ref:
 776                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 777                             arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 778
 779                             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 = ", ";"),
 780                             ret_conv_name = "(long)" + ty_info.var_name + "_ref",
 781                             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 + ")", ""))
 782                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 783                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 784                         ret_conv = ("long " + ty_info.var_name + "_ref = (long)&", ";"), ret_conv_name = ty_info.var_name + "_ref",
 785                         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 + ")", ""))
 786
 787                 # The manually-defined types - TxOut and Transaction
 788                 assert ty_info.rust_obj == "LDKTransaction" or ty_info.rust_obj == "LDKTxOut"
 789                 if ty_info.rust_obj == "LDKTransaction":
 790                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 791                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 792                         ret_conv = ("LDKTransaction *" + ty_info.var_name + "_copy = MALLOC(sizeof(LDKTransaction), \"LDKTransaction\");\n*" + ty_info.var_name + "_copy = ", ";\nlong " + ty_info.var_name + "_ref = (long)" + ty_info.var_name + "_copy;"),
 793                         ret_conv_name = ty_info.var_name + "_ref",
 794                         to_hu_conv = ty_info.java_hu_ty + " " + ty_info.var_name + "_conv = new " +ty_info.java_hu_ty + "(null, " + ty_info.var_name + ");",
 795                         to_hu_conv_name = ty_info.var_name + "_conv", from_hu_conv = (ty_info.var_name + ".ptr", ""))
 796                 elif ty_info.rust_obj == "LDKTxOut":
 797                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 798                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 799                         ret_conv = ("long " + ty_info.var_name + "_ref = (long)&", ";"), ret_conv_name = ty_info.var_name + "_ref",
 800                         to_hu_conv = ty_info.java_hu_ty + " " + ty_info.var_name + "_conv = new " +ty_info.java_hu_ty + "(null, " + ty_info.var_name + ");",
 801                         to_hu_conv_name = ty_info.var_name + "_conv", from_hu_conv = (ty_info.var_name + ".ptr", ""))
 802             elif ty_info.is_ptr:
 803                 assert(not is_free)
 804                 if ty_info.rust_obj in opaque_structs:
 805                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 806                         arg_conv = opaque_arg_conv, arg_conv_name = "&" + ty_info.var_name + "_conv", arg_conv_cleanup = None,
 807                         ret_conv = ("long ret_" + ty_info.var_name + " = (long)", ";"), ret_conv_name = "ret_" + ty_info.var_name,
 808                         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 + ");",
 809                         to_hu_conv_name = ty_info.var_name + "_hu_conv",
 810                         from_hu_conv = (ty_info.var_name + " == null ? 0 : " + ty_info.var_name + ".ptr & ~1", "this.ptrs_to.add(" + ty_info.var_name + ")"))
 811                 elif ty_info.rust_obj in complex_enums:
 812                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 813                         arg_conv = ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)" + ty_info.var_name + ";",
 814                         arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 815                         ret_conv = ("long ret_" + ty_info.var_name + " = (long)", ";"), ret_conv_name = "ret_" + ty_info.var_name,
 816                         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 + ");",
 817                         to_hu_conv_name = ty_info.var_name + "_hu_conv",
 818                         from_hu_conv = (ty_info.var_name + " == null ? 0 : " + ty_info.var_name + ".ptr & ~1", "this.ptrs_to.add(" + ty_info.var_name + ")"))
 819                 elif ty_info.rust_obj in trait_structs:
 820                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 821                         arg_conv = ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)" + ty_info.var_name + ";",
 822                         arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 823                         ret_conv = ("long ret_" + ty_info.var_name + " = (long)", ";"), ret_conv_name = "ret_" + ty_info.var_name,
 824                         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);",
 825                         to_hu_conv_name = "ret_hu_conv",
 826                         from_hu_conv = (ty_info.var_name + " == null ? 0 : " + ty_info.var_name + ".ptr", "this.ptrs_to.add(" + ty_info.var_name + ")"))
 827                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 828                     arg_conv = ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)" + ty_info.var_name + ";",
 829                     arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 830                     ret_conv = ("long ret_" + ty_info.var_name + " = (long)", ";"), ret_conv_name = "ret_" + ty_info.var_name,
 831                     to_hu_conv = "TODO 3", to_hu_conv_name = None, from_hu_conv = None) # its a pointer, no conv needed
 832             assert False # We should have handled every case by now.
 833
 834     def map_fn(line, re_match, ret_arr_len, c_call_string):
 835         out_java.write("\t// " + line)
 836         out_java.write("\tpublic static native ")
 837         write_c("JNIEXPORT ")
 838
 839         is_free = re_match.group(2).endswith("_free")
 840         struct_meth = re_match.group(2).split("_")[0]
 841
 842         ret_info = map_type(re_match.group(1), True, ret_arr_len, False, False)
 843         ret_info.print_ty()
 844
 845         if ret_info.ret_conv is not None:
 846             ret_conv_pfx, ret_conv_sfx = ret_info.ret_conv
 847
 848         out_java.write(" " + re_match.group(2) + "(")
 849         write_c(" JNICALL Java_org_ldk_impl_bindings_" + re_match.group(2).replace('_', '_1') + "(JNIEnv * _env, jclass _b")
 850
 851         arg_names = []
 852         default_constructor_args = {}
 853         takes_self = False
 854         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
 855         for idx, arg in enumerate(re_match.group(3).split(',')):
 856             if idx != 0:
 857                 out_java.write(", ")
 858             if arg != "void":
 859                 write_c(", ")
 860             arg_conv_info = map_type(arg, False, None, is_free, False)
 861             if arg_conv_info.c_ty != "void":
 862                 arg_conv_info.print_ty()
 863                 arg_conv_info.print_name()
 864             if arg_conv_info.arg_name == "this_ptr" or arg_conv_info.arg_name == "this_arg":
 865                 takes_self = True
 866             if arg_conv_info.arg_conv is not None and "Warning" in arg_conv_info.arg_conv:
 867                 if arg_conv_info.rust_obj in constructor_fns:
 868                     assert not is_free
 869                     for explode_arg in constructor_fns[arg_conv_info.rust_obj].split(','):
 870                         explode_arg_conv = map_type(explode_arg, False, None, False, False)
 871                         if explode_arg_conv.c_ty == "void":
 872                             # We actually want to handle this case, but for now its only used in NetGraphMsgHandler::new()
 873                             # which ends up resulting in a redundant constructor - both without arguments for the NetworkGraph.
 874                             args_known = False
 875                         assert explode_arg_conv.arg_name != "this_ptr"
 876                         assert explode_arg_conv.arg_name != "this_arg"
 877                         if explode_arg_conv.passed_as_ptr and not explode_arg_conv.rust_obj in trait_structs:
 878                             args_known = False
 879                         if not arg_conv_info.arg_name in default_constructor_args:
 880                             default_constructor_args[arg_conv_info.arg_name] = []
 881                         default_constructor_args[arg_conv_info.arg_name].append(explode_arg_conv)
 882                 else:
 883                     args_known = False
 884             arg_names.append(arg_conv_info)
 885
 886         out_java_struct = None
 887         if ("LDK" + struct_meth in opaque_structs or "LDK" + struct_meth in trait_structs) and not is_free:
 888             out_java_struct = open(sys.argv[3] + "/structs/" + struct_meth + ".java", "a")
 889             if not args_known:
 890                 out_java_struct.write("\t// Skipped " + re_match.group(2) + "\n")
 891                 out_java_struct.close()
 892                 out_java_struct = None
 893             else:
 894                 meth_n = re_match.group(2)[len(struct_meth) + 1:]
 895                 if ret_info.rust_obj == "LDK" + struct_meth:
 896                     out_java_struct.write("\tpublic static " + ret_info.java_hu_ty + " constructor_" + meth_n + "(")
 897                 else:
 898                     out_java_struct.write("\tpublic " + ret_info.java_hu_ty + " " + meth_n + "(")
 899                 for idx, arg in enumerate(arg_names):
 900                     if idx != 0:
 901                         if not takes_self or idx > 1:
 902                             out_java_struct.write(", ")
 903                     if arg.java_ty != "void" and arg.arg_name != "this_ptr" and arg.arg_name != "this_arg":
 904                         if arg.arg_name in default_constructor_args:
 905                             for explode_idx, explode_arg in enumerate(default_constructor_args[arg.arg_name]):
 906                                 if explode_idx != 0:
 907                                     out_java_struct.write(", ")
 908                                 assert explode_arg.rust_obj in opaque_structs or explode_arg.rust_obj in trait_structs
 909                                 out_java_struct.write(explode_arg.java_hu_ty + " " + arg.arg_name + "_" + explode_arg.arg_name)
 910                         else:
 911                             out_java_struct.write(arg.java_hu_ty + " " + arg.arg_name)
 912
 913
 914         out_java.write(");\n")
 915         write_c(") {\n")
 916         if out_java_struct is not None:
 917             out_java_struct.write(") {\n")
 918
 919         for info in arg_names:
 920             if info.arg_conv is not None:
 921                 write_c("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
 922
 923         if ret_info.ret_conv is not None:
 924             write_c("\t" + ret_conv_pfx.replace('\n', '\n\t'))
 925         elif ret_info.c_ty != "void":
 926             write_c("\t" + ret_info.c_ty + " ret_val = ")
 927         else:
 928             write_c("\t")
 929
 930         if c_call_string is None:
 931             write_c(re_match.group(2) + "(")
 932         else:
 933             write_c(c_call_string)
 934         for idx, info in enumerate(arg_names):
 935             if info.arg_conv_name is not None:
 936                 if idx != 0:
 937                     write_c(", ")
 938                 elif c_call_string is not None:
 939                     continue
 940                 write_c(info.arg_conv_name)
 941         write_c(")")
 942         if ret_info.ret_conv is not None:
 943             write_c(ret_conv_sfx.replace('\n', '\n\t'))
 944         else:
 945             write_c(";")
 946         for info in arg_names:
 947             if info.arg_conv_cleanup is not None:
 948                 write_c("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
 949         if ret_info.ret_conv is not None:
 950             write_c("\n\treturn " + ret_info.ret_conv_name + ";")
 951         elif ret_info.c_ty != "void":
 952             write_c("\n\treturn ret_val;")
 953         write_c("\n}\n\n")
 954         if out_java_struct is not None:
 955             out_java_struct.write("\t\t")
 956             if ret_info.java_ty != "void":
 957                 out_java_struct.write(ret_info.java_ty + " ret = ")
 958             out_java_struct.write("bindings." + re_match.group(2) + "(")
 959             for idx, info in enumerate(arg_names):
 960                 if idx != 0:
 961                     out_java_struct.write(", ")
 962                 if info.arg_name == "this_ptr" or info.arg_name == "this_arg":
 963                     out_java_struct.write("this.ptr")
 964                 elif info.arg_name in default_constructor_args:
 965                     out_java_struct.write("bindings." + info.java_hu_ty + "_new(")
 966                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
 967                         if explode_idx != 0:
 968                             out_java_struct.write(", ")
 969                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
 970                         out_java_struct.write(explode_arg.from_hu_conv[0].replace(explode_arg.arg_name, expl_arg_name))
 971                     out_java_struct.write(")")
 972                 elif info.from_hu_conv is not None:
 973                     out_java_struct.write(info.from_hu_conv[0])
 974                 else:
 975                     out_java_struct.write(info.arg_name)
 976             out_java_struct.write(");\n")
 977             if ret_info.to_hu_conv is not None:
 978                 out_java_struct.write("\t\t" + ret_info.to_hu_conv.replace("\n", "\n\t\t") + "\n")
 979
 980             for info in arg_names:
 981                 if info.arg_name == "this_ptr" or info.arg_name == "this_arg":
 982                     pass
 983                 elif info.arg_name in default_constructor_args:
 984                     for explode_arg in default_constructor_args[info.arg_name]:
 985                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
 986                         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")
 987                 elif info.from_hu_conv is not None and info.from_hu_conv[1] != "":
 988                     if ret_info.rust_obj == "LDK" + struct_meth and ret_info.to_hu_conv_name is not None:
 989                         out_java_struct.write("\t\t" + info.from_hu_conv[1].replace("this", ret_info.to_hu_conv_name) + ";\n")
 990                     else:
 991                         out_java_struct.write("\t\t" + info.from_hu_conv[1] + ";\n")
 992
 993             if ret_info.to_hu_conv_name is not None:
 994                 out_java_struct.write("\t\treturn " + ret_info.to_hu_conv_name + ";\n")
 995             elif ret_info.java_ty != "void" and ret_info.rust_obj != "LDK" + struct_meth:
 996                 out_java_struct.write("\t\treturn ret;\n")
 997             out_java_struct.write("\t}\n\n")
 998             out_java_struct.close()
 999
1000     def map_unitary_enum(struct_name, field_lines):
1001         with open(sys.argv[3] + "/enums/" + struct_name + ".java", "w") as out_java_enum:
1002             out_java_enum.write("package org.ldk.enums;\n\n")
1003             unitary_enums.add(struct_name)
1004             write_c("static inline " + struct_name + " " + struct_name + "_from_java(JNIEnv *env, jclass val) {\n")
1005             write_c("\tswitch ((*env)->CallIntMethod(env, val, ordinal_meth)) {\n")
1006             ord_v = 0
1007             for idx, struct_line in enumerate(field_lines):
1008                 if idx == 0:
1009                     out_java_enum.write("public enum " + struct_name + " {\n")
1010                 elif idx == len(field_lines) - 3:
1011                     assert(struct_line.endswith("_Sentinel,"))
1012                 elif idx == len(field_lines) - 2:
1013                     out_java_enum.write("\t; static native void init();\n")
1014                     out_java_enum.write("\tstatic { init(); }\n")
1015                     out_java_enum.write("}")
1016                     out_java.write("\tstatic { " + struct_name + ".values(); /* Force enum statics to run */ }\n")
1017                 elif idx == len(field_lines) - 1:
1018                     assert(struct_line == "")
1019                 else:
1020                     out_java_enum.write(struct_line + "\n")
1021                     write_c("\t\tcase %d: return %s;\n" % (ord_v, struct_line.strip().strip(",")))
1022                     ord_v = ord_v + 1
1023             write_c("\t}\n")
1024             write_c("\tabort();\n")
1025             write_c("}\n")
1026
1027             ord_v = 0
1028             write_c("static jclass " + struct_name + "_class = NULL;\n")
1029             for idx, struct_line in enumerate(field_lines):
1030                 if idx > 0 and idx < len(field_lines) - 3:
1031                     variant = struct_line.strip().strip(",")
1032                     write_c("static jfieldID " + struct_name + "_" + variant + " = NULL;\n")
1033             write_c("JNIEXPORT void JNICALL Java_org_ldk_enums_" + struct_name.replace("_", "_1") + "_init (JNIEnv * env, jclass clz) {\n")
1034             write_c("\t" + struct_name + "_class = (*env)->NewGlobalRef(env, clz);\n")
1035             write_c("\tCHECK(" + struct_name + "_class != NULL);\n")
1036             for idx, struct_line in enumerate(field_lines):
1037                 if idx > 0 and idx < len(field_lines) - 3:
1038                     variant = struct_line.strip().strip(",")
1039                     write_c("\t" + struct_name + "_" + variant + " = (*env)->GetStaticFieldID(env, " + struct_name + "_class, \"" + variant + "\", \"Lorg/ldk/enums/" + struct_name + ";\");\n")
1040                     write_c("\tCHECK(" + struct_name + "_" + variant + " != NULL);\n")
1041             write_c("}\n")
1042             write_c("static inline jclass " + struct_name + "_to_java(JNIEnv *env, " + struct_name + " val) {\n")
1043             write_c("\tswitch (val) {\n")
1044             for idx, struct_line in enumerate(field_lines):
1045                 if idx > 0 and idx < len(field_lines) - 3:
1046                     variant = struct_line.strip().strip(",")
1047                     write_c("\t\tcase " + variant + ":\n")
1048                     write_c("\t\t\treturn (*env)->GetStaticObjectField(env, " + struct_name + "_class, " + struct_name + "_" + variant + ");\n")
1049                     ord_v = ord_v + 1
1050             write_c("\t\tdefault: abort();\n")
1051             write_c("\t}\n")
1052             write_c("}\n\n")
1053
1054     def map_complex_enum(struct_name, union_enum_items):
1055         java_hu_type = struct_name.replace("LDK", "")
1056         complex_enums.add(struct_name)
1057         with open(sys.argv[3] + "/structs/" + java_hu_type + ".java", "w") as out_java_enum:
1058             out_java_enum.write(hu_struct_file_prefix)
1059             out_java_enum.write("public class " + java_hu_type + " extends CommonBase {\n")
1060             out_java_enum.write("\tprivate " + java_hu_type + "(Object _dummy, long ptr) { super(ptr); }\n")
1061             out_java_enum.write("\t@Override @SuppressWarnings(\"deprecation\")\n")
1062             out_java_enum.write("\tprotected void finalize() throws Throwable {\n")
1063             out_java_enum.write("\t\tsuper.finalize();\n")
1064             out_java_enum.write("\t\tif (ptr != 0) { bindings." + java_hu_type + "_free(ptr); }\n")
1065             out_java_enum.write("\t}\n")
1066             out_java_enum.write("\tstatic " + java_hu_type + " constr_from_ptr(long ptr) {\n")
1067             out_java_enum.write("\t\tbindings." + struct_name + " raw_val = bindings." + struct_name + "_ref_from_ptr(ptr);\n")
1068             java_hu_subclasses = ""
1069
1070             tag_field_lines = union_enum_items["field_lines"]
1071             init_meth_jty_strs = {}
1072             for idx, struct_line in enumerate(tag_field_lines):
1073                 if idx == 0:
1074                     out_java.write("\tpublic static class " + struct_name + " {\n")
1075                     out_java.write("\t\tprivate " + struct_name + "() {}\n")
1076                 elif idx == len(tag_field_lines) - 3:
1077                     assert(struct_line.endswith("_Sentinel,"))
1078                 elif idx == len(tag_field_lines) - 2:
1079                     out_java.write("\t\tstatic native void init();\n")
1080                     out_java.write("\t}\n")
1081                 elif idx == len(tag_field_lines) - 1:
1082                     assert(struct_line == "")
1083                 else:
1084                     var_name = struct_line.strip(' ,')[len(struct_name) + 1:]
1085                     out_java.write("\t\tpublic final static class " + var_name + " extends " + struct_name + " {\n")
1086                     java_hu_subclasses = java_hu_subclasses + "\tpublic final static class " + var_name + " extends " + java_hu_type + " {\n"
1087                     out_java_enum.write("\t\tif (raw_val.getClass() == bindings." + struct_name + "." + var_name + ".class) {\n")
1088                     out_java_enum.write("\t\t\treturn new " + var_name + "(ptr, (bindings." + struct_name + "." + var_name + ")raw_val);\n")
1089                     write_c("static jclass " + struct_name + "_" + var_name + "_class = NULL;\n")
1090                     write_c("static jmethodID " + struct_name + "_" + var_name + "_meth = NULL;\n")
1091                     init_meth_jty_str = ""
1092                     init_meth_params = ""
1093                     init_meth_body = ""
1094                     hu_conv_body = ""
1095                     if "LDK" + var_name in union_enum_items:
1096                         enum_var_lines = union_enum_items["LDK" + var_name]
1097                         for idx, field in enumerate(enum_var_lines):
1098                             if idx != 0 and idx < len(enum_var_lines) - 2:
1099                                 field_ty = map_type(field.strip(' ;'), False, None, False, True)
1100                                 out_java.write("\t\t\tpublic " + field_ty.java_ty + " " + field_ty.arg_name + ";\n")
1101                                 java_hu_subclasses = java_hu_subclasses + "\t\tpublic final " + field_ty.java_hu_ty + " " + field_ty.arg_name + ";\n"
1102                                 if field_ty.to_hu_conv is not None:
1103                                     hu_conv_body = hu_conv_body + "\t\t\t" + field_ty.java_ty + " " + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
1104                                     hu_conv_body = hu_conv_body + "\t\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
1105                                     hu_conv_body = hu_conv_body + "\t\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
1106                                 else:
1107                                     hu_conv_body = hu_conv_body + "\t\t\tthis." + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
1108                                 init_meth_jty_str = init_meth_jty_str + field_ty.java_fn_ty_arg
1109                                 if idx > 1:
1110                                     init_meth_params = init_meth_params + ", "
1111                                 init_meth_params = init_meth_params + field_ty.java_ty + " " + field_ty.arg_name
1112                                 init_meth_body = init_meth_body + "this." + field_ty.arg_name + " = " + field_ty.arg_name + "; "
1113                         out_java.write("\t\t\t" + var_name + "(" + init_meth_params + ") { ")
1114                         out_java.write(init_meth_body)
1115                         out_java.write("}\n")
1116                     out_java.write("\t\t}\n")
1117                     out_java_enum.write("\t\t}\n")
1118                     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"
1119                     java_hu_subclasses = java_hu_subclasses + hu_conv_body
1120                     java_hu_subclasses = java_hu_subclasses + "\t\t}\n\t}\n"
1121                     init_meth_jty_strs[var_name] = init_meth_jty_str
1122             out_java_enum.write("\t\tassert false; return null; // Unreachable without extending the (internal) bindings interface\n\t}\n\n")
1123             out_java_enum.write(java_hu_subclasses)
1124             out_java.write("\tstatic { " + struct_name + ".init(); }\n")
1125             out_java.write("\tpublic static native " + struct_name + " " + struct_name + "_ref_from_ptr(long ptr);\n");
1126
1127             write_c("JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_00024" + struct_name.replace("_", "_1") + "_init (JNIEnv * env, jclass _a) {\n")
1128             for idx, struct_line in enumerate(tag_field_lines):
1129                 if idx != 0 and idx < len(tag_field_lines) - 3:
1130                     var_name = struct_line.strip(' ,')[len(struct_name) + 1:]
1131                     write_c("\t" + struct_name + "_" + var_name + "_class =\n")
1132                     write_c("\t\t(*env)->NewGlobalRef(env, (*env)->FindClass(env, \"Lorg/ldk/impl/bindings$" + struct_name + "$" + var_name + ";\"));\n")
1133                     write_c("\tCHECK(" + struct_name + "_" + var_name + "_class != NULL);\n")
1134                     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")
1135                     write_c("\tCHECK(" + struct_name + "_" + var_name + "_meth != NULL);\n")
1136             write_c("}\n")
1137             write_c("JNIEXPORT jobject JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1ref_1from_1ptr (JNIEnv * _env, jclass _c, jlong ptr) {\n")
1138             write_c("\t" + struct_name + " *obj = (" + struct_name + "*)ptr;\n")
1139             write_c("\tswitch(obj->tag) {\n")
1140             for idx, struct_line in enumerate(tag_field_lines):
1141                 if idx != 0 and idx < len(tag_field_lines) - 3:
1142                     var_name = struct_line.strip(' ,')[len(struct_name) + 1:]
1143                     write_c("\t\tcase " + struct_name + "_" + var_name + ": {\n")
1144                     c_params_text = ""
1145                     if "LDK" + var_name in union_enum_items:
1146                         enum_var_lines = union_enum_items["LDK" + var_name]
1147                         for idx, field in enumerate(enum_var_lines):
1148                             if idx != 0 and idx < len(enum_var_lines) - 2:
1149                                 field_map = map_type(field.strip(' ;'), False, None, False, True)
1150                                 if field_map.ret_conv is not None:
1151                                     write_c("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
1152                                     write_c("obj->" + camel_to_snake(var_name) + "." + field_map.arg_name)
1153                                     write_c(field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
1154                                     c_params_text = c_params_text + ", " + field_map.ret_conv_name
1155                                 else:
1156                                     c_params_text = c_params_text + ", obj->" + camel_to_snake(var_name) + "." + field_map.arg_name
1157                     write_c("\t\t\treturn (*_env)->NewObject(_env, " + struct_name + "_" + var_name + "_class, " + struct_name + "_" + var_name + "_meth" + c_params_text + ");\n")
1158                     write_c("\t\t}\n")
1159             write_c("\t\tdefault: abort();\n")
1160             write_c("\t}\n}\n")
1161             out_java_enum.write("}\n")
1162
1163     def map_trait(struct_name, field_var_lines, trait_fn_lines):
1164         with open(sys.argv[3] + "/structs/" + struct_name.replace("LDK","") + ".java", "w") as out_java_trait:
1165             write_c("typedef struct " + struct_name + "_JCalls {\n")
1166             write_c("\tatomic_size_t refcnt;\n")
1167             write_c("\tJavaVM *vm;\n")
1168             write_c("\tjweak o;\n")
1169             field_var_convs = []
1170             for var_line in field_var_lines:
1171                 if var_line.group(1) in trait_structs:
1172                     write_c("\t" + var_line.group(1) + "_JCalls* " + var_line.group(2) + ";\n")
1173                     field_var_convs.append(None)
1174                 else:
1175                     field_var_convs.append(map_type(var_line.group(1) + " " + var_line.group(2), False, None, False, False))
1176             for fn_line in trait_fn_lines:
1177                 if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
1178                     write_c("\tjmethodID " + fn_line.group(2) + "_meth;\n")
1179             write_c("} " + struct_name + "_JCalls;\n")
1180
1181             out_java_trait.write(hu_struct_file_prefix)
1182             out_java_trait.write("public class " + struct_name.replace("LDK","") + " extends CommonBase {\n")
1183             out_java_trait.write("\tfinal bindings." + struct_name + " bindings_instance;\n")
1184             out_java_trait.write("\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); bindings_instance = null; }\n")
1185             out_java_trait.write("\tprivate " + struct_name.replace("LDK", "") + "(bindings." + struct_name + " arg")
1186             for idx, var_line in enumerate(field_var_lines):
1187                 if var_line.group(1) in trait_structs:
1188                     out_java_trait.write(", bindings." + var_line.group(1) + " " + var_line.group(2))
1189                 else:
1190                     out_java_trait.write(", " + field_var_convs[idx].java_hu_ty + " " + var_line.group(2))
1191             out_java_trait.write(") {\n")
1192             out_java_trait.write("\t\tsuper(bindings." + struct_name + "_new(arg")
1193             for idx, var_line in enumerate(field_var_lines):
1194                 if var_line.group(1) in trait_structs:
1195                     out_java_trait.write(", " + var_line.group(2))
1196                 elif field_var_convs[idx].from_hu_conv is not None:
1197                     out_java_trait.write(", " + field_var_convs[idx].from_hu_conv[0])
1198                 else:
1199                     out_java_trait.write(", " + var_line.group(2))
1200             out_java_trait.write("));\n")
1201             out_java_trait.write("\t\tthis.ptrs_to.add(arg);\n")
1202             for idx, var_line in enumerate(field_var_lines):
1203                 if var_line.group(1) in trait_structs:
1204                     out_java_trait.write("\t\tthis.ptrs_to.add(" + var_line.group(2) + ");\n")
1205                 elif field_var_convs[idx].from_hu_conv is not None and field_var_convs[idx].from_hu_conv[1] != "":
1206                     out_java_trait.write("\t\t" + field_var_convs[idx].from_hu_conv[1] + ";\n")
1207             out_java_trait.write("\t\tthis.bindings_instance = arg;\n")
1208             out_java_trait.write("\t}\n")
1209             out_java_trait.write("\t@Override @SuppressWarnings(\"deprecation\")\n")
1210             out_java_trait.write("\tprotected void finalize() throws Throwable {\n")
1211             out_java_trait.write("\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); } super.finalize();\n")
1212             out_java_trait.write("\t}\n\n")
1213
1214             java_trait_constr = "\tpublic " + struct_name.replace("LDK", "") + "(" + struct_name.replace("LDK", "") + "Interface arg"
1215             for idx, var_line in enumerate(field_var_lines):
1216                 if var_line.group(1) in trait_structs:
1217                     # Ideally we'd be able to take any instance of the interface, but our C code can only represent
1218                     # Java-implemented version, so we require users pass a Java implementation here :/
1219                     java_trait_constr = java_trait_constr + ", " + var_line.group(1).replace("LDK", "") + "." + var_line.group(1).replace("LDK", "") + "Interface " + var_line.group(2)
1220                 else:
1221                     java_trait_constr = java_trait_constr + ", " + field_var_convs[idx].java_hu_ty + " " + var_line.group(2)
1222             java_trait_constr = java_trait_constr + ") {\n\t\tthis(new bindings." + struct_name + "() {\n"
1223             out_java_trait.write("\tpublic static interface " + struct_name.replace("LDK", "") + "Interface {\n")
1224             out_java.write("\tpublic interface " + struct_name + " {\n")
1225             java_meths = []
1226             for fn_line in trait_fn_lines:
1227                 java_meth_descr = "("
1228                 if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
1229                     ret_ty_info = map_type(fn_line.group(1), True, None, False, False)
1230
1231                     out_java.write("\t\t " + ret_ty_info.java_ty + " " + fn_line.group(2) + "(")
1232                     java_trait_constr = java_trait_constr + "\t\t\t@Override public " + ret_ty_info.java_ty + " " + fn_line.group(2) + "("
1233                     out_java_trait.write("\t\t" + ret_ty_info.java_hu_ty + " " + fn_line.group(2) + "(")
1234                     is_const = fn_line.group(3) is not None
1235                     write_c(fn_line.group(1) + fn_line.group(2) + "_jcall(")
1236                     if is_const:
1237                         write_c("const void* this_arg")
1238                     else:
1239                         write_c("void* this_arg")
1240
1241                     arg_names = []
1242                     for idx, arg in enumerate(fn_line.group(4).split(',')):
1243                         if arg == "":
1244                             continue
1245                         if idx >= 2:
1246                             out_java.write(", ")
1247                             java_trait_constr = java_trait_constr + ", "
1248                             out_java_trait.write(", ")
1249                         write_c(", ")
1250                         arg_conv_info = map_type(arg, True, None, False, False)
1251                         write_c(arg.strip())
1252                         out_java.write(arg_conv_info.java_ty + " " + arg_conv_info.arg_name)
1253                         out_java_trait.write(arg_conv_info.java_hu_ty + " " + arg_conv_info.arg_name)
1254                         java_trait_constr = java_trait_constr + arg_conv_info.java_ty + " " + arg_conv_info.arg_name
1255                         arg_names.append(arg_conv_info)
1256                         java_meth_descr = java_meth_descr + arg_conv_info.java_fn_ty_arg
1257                     java_meth_descr = java_meth_descr + ")" + ret_ty_info.java_fn_ty_arg
1258                     java_meths.append(java_meth_descr)
1259
1260                     out_java.write(");\n")
1261                     out_java_trait.write(");\n")
1262                     java_trait_constr = java_trait_constr + ") {\n"
1263                     write_c(") {\n")
1264                     write_c("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
1265                     write_c("\tJNIEnv *_env;\n")
1266                     write_c("\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&_env, JNI_VERSION_1_8) == JNI_OK);\n")
1267
1268                     for arg_info in arg_names:
1269                         if arg_info.ret_conv is not None:
1270                             write_c("\t" + arg_info.ret_conv[0].replace('\n', '\n\t'));
1271                             write_c(arg_info.arg_name)
1272                             write_c(arg_info.ret_conv[1].replace('\n', '\n\t') + "\n")
1273                         if arg_info.to_hu_conv is not None:
1274                             java_trait_constr = java_trait_constr + "\t\t\t\t" + arg_info.to_hu_conv.replace("\n", "\n\t\t\t\t") + "\n"
1275
1276                     write_c("\tjobject obj = (*_env)->NewLocalRef(_env, j_calls->o);\n\tCHECK(obj != NULL);\n")
1277                     if ret_ty_info.c_ty.endswith("Array"):
1278                         write_c("\t" + ret_ty_info.c_ty + " arg = (*_env)->CallObjectMethod(_env, obj, j_calls->" + fn_line.group(2) + "_meth")
1279                     elif not ret_ty_info.passed_as_ptr:
1280                         write_c("\treturn (*_env)->Call" + ret_ty_info.java_ty.title() + "Method(_env, obj, j_calls->" + fn_line.group(2) + "_meth")
1281                     else:
1282                         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");
1283                     if ret_ty_info.java_ty != "void":
1284                         java_trait_constr = java_trait_constr + "\t\t\t\t" + ret_ty_info.java_hu_ty + " ret = arg." + fn_line.group(2) + "("
1285                     else:
1286                         java_trait_constr = java_trait_constr + "\t\t\t\targ." + fn_line.group(2) + "("
1287
1288                     for idx, arg_info in enumerate(arg_names):
1289                         if arg_info.ret_conv is not None:
1290                             write_c(", " + arg_info.ret_conv_name)
1291                         else:
1292                             write_c(", " + arg_info.arg_name)
1293                         if idx != 0:
1294                             java_trait_constr = java_trait_constr + ", "
1295                         if arg_info.to_hu_conv_name is not None:
1296                             java_trait_constr = java_trait_constr + arg_info.to_hu_conv_name
1297                         else:
1298                             java_trait_constr = java_trait_constr + arg_info.arg_name
1299                     write_c(");\n");
1300                     if ret_ty_info.arg_conv is not None:
1301                         write_c("\t" + ret_ty_info.arg_conv.replace("\n", "\n\t") + "\n\treturn " + ret_ty_info.arg_conv_name + ";\n")
1302
1303                     write_c("}\n")
1304                     java_trait_constr = java_trait_constr + ");\n"
1305                     if ret_ty_info.java_ty != "void":
1306                         if ret_ty_info.from_hu_conv is not None:
1307                             java_trait_constr = java_trait_constr + "\t\t\t\t" + ret_ty_info.java_ty + " result = " + ret_ty_info.from_hu_conv[0] + ";\n"
1308                             if ret_ty_info.from_hu_conv[1] != "":
1309                                 java_trait_constr = java_trait_constr + "\t\t\t\t//TODO: May need to call: " + ret_ty_info.from_hu_conv[1] + ";\n"
1310                             if is_common_base_ext(ret_ty_info.rust_obj):
1311                                 java_trait_constr = java_trait_constr + "\t\t\t\tret.ptr = 0;\n"
1312                             java_trait_constr = java_trait_constr + "\t\t\t\treturn result;\n"
1313                         else:
1314                             java_trait_constr = java_trait_constr + "\t\t\t\treturn ret;\n"
1315                     java_trait_constr = java_trait_constr + "\t\t\t}\n"
1316                 elif fn_line.group(2) == "free":
1317                     write_c("static void " + struct_name + "_JCalls_free(void* this_arg) {\n")
1318                     write_c("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
1319                     write_c("\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n")
1320                     write_c("\t\tJNIEnv *env;\n")
1321                     write_c("\t\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_8) == JNI_OK);\n")
1322                     write_c("\t\t(*env)->DeleteWeakGlobalRef(env, j_calls->o);\n")
1323                     write_c("\t\tFREE(j_calls);\n")
1324                     write_c("\t}\n}\n")
1325             java_trait_constr = java_trait_constr + "\t\t}"
1326             for var_line in field_var_lines:
1327                 if var_line.group(1) in trait_structs:
1328                     java_trait_constr = java_trait_constr + ", new " + var_line.group(2) + "(" + var_line.group(2) + ").bindings_instance"
1329                 else:
1330                     java_trait_constr = java_trait_constr + ", " + var_line.group(2)
1331             out_java_trait.write("\t}\n")
1332             out_java_trait.write(java_trait_constr + ");\n\t}\n")
1333
1334             # Write out a clone function whether we need one or not, as we use them in moving to rust
1335             write_c("static void* " + struct_name + "_JCalls_clone(const void* this_arg) {\n")
1336             write_c("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
1337             write_c("\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n")
1338             for var_line in field_var_lines:
1339                 if var_line.group(1) in trait_structs:
1340                     write_c("\tatomic_fetch_add_explicit(&j_calls->" + var_line.group(2) + "->refcnt, 1, memory_order_release);\n")
1341             write_c("\treturn (void*) this_arg;\n")
1342             write_c("}\n")
1343
1344             out_java.write("\t}\n")
1345
1346             out_java.write("\tpublic static native long " + struct_name + "_new(" + struct_name + " impl")
1347             write_c("static inline " + struct_name + " " + struct_name + "_init (JNIEnv * env, jclass _a, jobject o")
1348             for idx, var_line in enumerate(field_var_lines):
1349                 if var_line.group(1) in trait_structs:
1350                     out_java.write(", " + var_line.group(1) + " " + var_line.group(2))
1351                     write_c(", jobject " + var_line.group(2))
1352                 else:
1353                     out_java.write(", " + field_var_convs[idx].java_ty + " " + var_line.group(2))
1354                     write_c(", " + field_var_convs[idx].c_ty + " " + var_line.group(2))
1355             out_java.write(");\n")
1356             write_c(") {\n")
1357
1358             write_c("\tjclass c = (*env)->GetObjectClass(env, o);\n")
1359             write_c("\tCHECK(c != NULL);\n")
1360             write_c("\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n")
1361             write_c("\tatomic_init(&calls->refcnt, 1);\n")
1362             write_c("\tDO_ASSERT((*env)->GetJavaVM(env, &calls->vm) == 0);\n")
1363             write_c("\tcalls->o = (*env)->NewWeakGlobalRef(env, o);\n")
1364             for (fn_line, java_meth_descr) in zip(trait_fn_lines, java_meths):
1365                 if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
1366                     write_c("\tcalls->" + fn_line.group(2) + "_meth = (*env)->GetMethodID(env, c, \"" + fn_line.group(2) + "\", \"" + java_meth_descr + "\");\n")
1367                     write_c("\tCHECK(calls->" + fn_line.group(2) + "_meth != NULL);\n")
1368             for idx, var_line in enumerate(field_var_lines):
1369                 if field_var_convs[idx] is not None and field_var_convs[idx].arg_conv is not None:
1370                     write_c("\n\t" + field_var_convs[idx].arg_conv.replace("\n", "\n\t") +"\n")
1371             write_c("\n\t" + struct_name + " ret = {\n")
1372             write_c("\t\t.this_arg = (void*) calls,\n")
1373             for fn_line in trait_fn_lines:
1374                 if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
1375                     write_c("\t\t." + fn_line.group(2) + " = " + fn_line.group(2) + "_jcall,\n")
1376                 elif fn_line.group(2) == "free":
1377                     write_c("\t\t.free = " + struct_name + "_JCalls_free,\n")
1378                 else:
1379                     clone_fns.add(struct_name + "_clone")
1380                     write_c("\t\t.clone = " + struct_name + "_JCalls_clone,\n")
1381             for idx, var_line in enumerate(field_var_lines):
1382                 if var_line.group(1) in trait_structs:
1383                     write_c("\t\t." + var_line.group(2) + " = " + var_line.group(1) + "_init(env, _a, " + var_line.group(2) + "),\n")
1384                 elif field_var_convs[idx].arg_conv_name is not None:
1385                     write_c("\t\t." + var_line.group(2) + " = " + field_var_convs[idx].arg_conv_name + ",\n")
1386                     write_c("\t\t.set_" + var_line.group(2) + " = NULL,\n")
1387                 else:
1388                     write_c("\t\t." + var_line.group(2) + " = " + var_line.group(2) + ",\n")
1389                     write_c("\t\t.set_" + var_line.group(2) + " = NULL,\n")
1390             write_c("\t};\n")
1391             for var_line in field_var_lines:
1392                 if var_line.group(1) in trait_structs:
1393                     write_c("\tcalls->" + var_line.group(2) + " = ret." + var_line.group(2) + ".this_arg;\n")
1394             write_c("\treturn ret;\n")
1395             write_c("}\n")
1396
1397             write_c("JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1new (JNIEnv * env, jclass _a, jobject o")
1398             for idx, var_line in enumerate(field_var_lines):
1399                 if var_line.group(1) in trait_structs:
1400                     write_c(", jobject " + var_line.group(2))
1401                 else:
1402                     write_c(", " + field_var_convs[idx].c_ty + " " + var_line.group(2))
1403             write_c(") {\n")
1404             write_c("\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n")
1405             write_c("\t*res_ptr = " + struct_name + "_init(env, _a, o")
1406             for var_line in field_var_lines:
1407                 write_c(", " + var_line.group(2))
1408             write_c(");\n")
1409             write_c("\treturn (long)res_ptr;\n")
1410             write_c("}\n")
1411
1412             out_java.write("\tpublic static native " + struct_name + " " + struct_name + "_get_obj_from_jcalls(long val);\n")
1413             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")
1414             write_c("\tjobject ret = (*env)->NewLocalRef(env, ((" + struct_name + "_JCalls*)val)->o);\n")
1415             write_c("\tCHECK(ret != NULL);\n")
1416             write_c("\treturn ret;\n")
1417             write_c("}\n")
1418
1419         for fn_line in trait_fn_lines:
1420             # For now, just disable enabling the _call_log - we don't know how to inverse-map String
1421             is_log = fn_line.group(2) == "log" and struct_name == "LDKLogger"
1422             if fn_line.group(2) != "free" and fn_line.group(2) != "clone" and fn_line.group(2) != "eq" and not is_log:
1423                 dummy_line = fn_line.group(1) + struct_name.replace("LDK", "") + "_" + fn_line.group(2) + " " + struct_name + "* this_arg" + fn_line.group(4) + "\n"
1424                 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")
1425         for idx, var_line in enumerate(field_var_lines):
1426             if var_line.group(1) not in trait_structs:
1427                 write_c(var_line.group(1) + " " + struct_name + "_set_get_" + var_line.group(2) + "(" + struct_name + "* this_arg) {\n")
1428                 write_c("\tif (this_arg->set_" + var_line.group(2) + " != NULL)\n")
1429                 write_c("\t\tthis_arg->set_" + var_line.group(2) + "(this_arg);\n")
1430                 write_c("\treturn this_arg->" + var_line.group(2) + ";\n")
1431                 write_c("}\n")
1432                 dummy_line = var_line.group(1) + " " + struct_name.replace("LDK", "") + "_get_" + var_line.group(2) + " " + struct_name + "* this_arg" + fn_line.group(4) + "\n"
1433                 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")
1434
1435     out_java.write("""package org.ldk.impl;
1436 import org.ldk.enums.*;
1437
1438 public class bindings {
1439         public static class VecOrSliceDef {
1440                 public long dataptr;
1441                 public long datalen;
1442                 public long stride;
1443                 public VecOrSliceDef(long dataptr, long datalen, long stride) {
1444                         this.dataptr = dataptr; this.datalen = datalen; this.stride = stride;
1445                 }
1446         }
1447         static {
1448                 System.loadLibrary(\"lightningjni\");
1449                 init(java.lang.Enum.class, VecOrSliceDef.class);
1450                 init_class_cache();
1451         }
1452         static native void init(java.lang.Class c, java.lang.Class slicedef);
1453         static native void init_class_cache();
1454
1455         public static native boolean deref_bool(long ptr);
1456         public static native long deref_long(long ptr);
1457         public static native void free_heap_ptr(long ptr);
1458         public static native byte[] read_bytes(long ptr, long len);
1459         public static native byte[] get_u8_slice_bytes(long slice_ptr);
1460         public static native long bytes_to_u8_vec(byte[] bytes);
1461         public static native long new_txpointer_copy_data(byte[] txdata);
1462         public static native void txpointer_free(long ptr);
1463         public static native byte[] txpointer_get_buffer(long ptr);
1464         public static native long vec_slice_len(long vec);
1465         public static native long new_empty_slice_vec();
1466
1467 """)
1468     write_c("""
1469 static jmethodID ordinal_meth = NULL;
1470 static jmethodID slicedef_meth = NULL;
1471 static jclass slicedef_cls = NULL;
1472 JNIEXPORT void Java_org_ldk_impl_bindings_init(JNIEnv * env, jclass _b, jclass enum_class, jclass slicedef_class) {
1473         ordinal_meth = (*env)->GetMethodID(env, enum_class, "ordinal", "()I");
1474         CHECK(ordinal_meth != NULL);
1475         slicedef_meth = (*env)->GetMethodID(env, slicedef_class, "<init>", "(JJJ)V");
1476         CHECK(slicedef_meth != NULL);
1477         slicedef_cls = (*env)->NewGlobalRef(env, slicedef_class);
1478         CHECK(slicedef_cls != NULL);
1479 }
1480
1481 JNIEXPORT jboolean JNICALL Java_org_ldk_impl_bindings_deref_1bool (JNIEnv * env, jclass _a, jlong ptr) {
1482         return *((bool*)ptr);
1483 }
1484 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_deref_1long (JNIEnv * env, jclass _a, jlong ptr) {
1485         return *((long*)ptr);
1486 }
1487 JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_free_1heap_1ptr (JNIEnv * env, jclass _a, jlong ptr) {
1488         FREE((void*)ptr);
1489 }
1490 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_read_1bytes (JNIEnv * _env, jclass _b, jlong ptr, jlong len) {
1491         jbyteArray ret_arr = (*_env)->NewByteArray(_env, len);
1492         (*_env)->SetByteArrayRegion(_env, ret_arr, 0, len, (unsigned char*)ptr);
1493         return ret_arr;
1494 }
1495 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_get_1u8_1slice_1bytes (JNIEnv * _env, jclass _b, jlong slice_ptr) {
1496         LDKu8slice *slice = (LDKu8slice*)slice_ptr;
1497         jbyteArray ret_arr = (*_env)->NewByteArray(_env, slice->datalen);
1498         (*_env)->SetByteArrayRegion(_env, ret_arr, 0, slice->datalen, slice->data);
1499         return ret_arr;
1500 }
1501 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_bytes_1to_1u8_1vec (JNIEnv * _env, jclass _b, jbyteArray bytes) {
1502         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "LDKCVec_u8");
1503         vec->datalen = (*_env)->GetArrayLength(_env, bytes);
1504         vec->data = (uint8_t*)MALLOC(vec->datalen, "LDKCVec_u8Z Bytes");
1505         (*_env)->GetByteArrayRegion (_env, bytes, 0, vec->datalen, vec->data);
1506         return (long)vec;
1507 }
1508 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_txpointer_1get_1buffer (JNIEnv * env, jclass _b, jlong ptr) {
1509         LDKTransaction *txdata = (LDKTransaction*)ptr;
1510         LDKu8slice slice;
1511         slice.data = txdata->data;
1512         slice.datalen = txdata->datalen;
1513         return Java_org_ldk_impl_bindings_get_1u8_1slice_1bytes(env, _b, (long)&slice);
1514 }
1515 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_new_1txpointer_1copy_1data (JNIEnv * env, jclass _b, jbyteArray bytes) {
1516         LDKTransaction *txdata = (LDKTransaction*)MALLOC(sizeof(LDKTransaction), "LDKTransaction");
1517         txdata->datalen = (*env)->GetArrayLength(env, bytes);
1518         txdata->data = (uint8_t*)MALLOC(txdata->datalen, "Tx Data Bytes");
1519         txdata->data_is_owned = false;
1520         (*env)->GetByteArrayRegion (env, bytes, 0, txdata->datalen, txdata->data);
1521         return (long)txdata;
1522 }
1523 JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_txpointer_1free (JNIEnv * env, jclass _b, jlong ptr) {
1524         LDKTransaction *tx = (LDKTransaction*)ptr;
1525         tx->data_is_owned = true;
1526         Transaction_free(*tx);
1527         FREE((void*)ptr);
1528 }
1529 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_vec_1slice_1len (JNIEnv * env, jclass _a, jlong ptr) {
1530         // Check offsets of a few Vec types are all consistent as we're meant to be generic across types
1531         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_SignatureZ, datalen), "Vec<*> needs to be mapped identically");
1532         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_MessageSendEventZ, datalen), "Vec<*> needs to be mapped identically");
1533         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_EventZ, datalen), "Vec<*> needs to be mapped identically");
1534         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_C2Tuple_usizeTransactionZZ, datalen), "Vec<*> needs to be mapped identically");
1535         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)ptr;
1536         return (long)vec->datalen;
1537 }
1538 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_new_1empty_1slice_1vec (JNIEnv * _env, jclass _b) {
1539         // Check sizes of a few Vec types are all consistent as we're meant to be generic across types
1540         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_SignatureZ), "Vec<*> needs to be mapped identically");
1541         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_MessageSendEventZ), "Vec<*> needs to be mapped identically");
1542         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_EventZ), "Vec<*> needs to be mapped identically");
1543         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_C2Tuple_usizeTransactionZZ), "Vec<*> needs to be mapped identically");
1544         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "Empty LDKCVec");
1545         vec->data = NULL;
1546         vec->datalen = 0;
1547         return (long)vec;
1548 }
1549
1550 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
1551 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
1552 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
1553 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
1554
1555 """)
1556
1557     with open(sys.argv[3] + "/structs/CommonBase.java", "a") as out_java_struct:
1558         out_java_struct.write("""package org.ldk.structs;
1559 import java.util.LinkedList;
1560 class CommonBase {
1561         long ptr;
1562         LinkedList<Object> ptrs_to = new LinkedList();
1563         protected CommonBase(long ptr) { this.ptr = ptr; }
1564         public long _test_only_get_ptr() { return this.ptr; }
1565 }
1566 """)
1567
1568     in_block_comment = False
1569     cur_block_obj = None
1570
1571     const_val_regex = re.compile("^extern const ([A-Za-z_0-9]*) ([A-Za-z_0-9]*);$")
1572
1573     line_indicates_result_regex = re.compile("^   (LDKCResultPtr_[A-Za-z_0-9]*) contents;$")
1574     line_indicates_vec_regex = re.compile("^   ([A-Za-z_0-9]*) \*data;$")
1575     line_indicates_opaque_regex = re.compile("^   bool is_owned;$")
1576     line_indicates_trait_regex = re.compile("^   ([A-Za-z_0-9]* \*?)\(\*([A-Za-z_0-9]*)\)\((const )?void \*this_arg(.*)\);$")
1577     assert(line_indicates_trait_regex.match("   uintptr_t (*send_data)(void *this_arg, LDKu8slice data, bool resume_read);"))
1578     assert(line_indicates_trait_regex.match("   LDKCVec_MessageSendEventZ (*get_and_clear_pending_msg_events)(const void *this_arg);"))
1579     assert(line_indicates_trait_regex.match("   void *(*clone)(const void *this_arg);"))
1580     line_field_var_regex = re.compile("^   ([A-Za-z_0-9]*) ([A-Za-z_0-9]*);$")
1581     assert(line_field_var_regex.match("   LDKMessageSendEventsProvider MessageSendEventsProvider;"))
1582     assert(line_field_var_regex.match("   LDKChannelPublicKeys pubkeys;"))
1583     struct_name_regex = re.compile("^typedef (struct|enum|union) (MUST_USE_STRUCT )?(LDK[A-Za-z_0-9]*) {$")
1584     assert(struct_name_regex.match("typedef struct LDKCVecTempl_u8 {"))
1585     assert(struct_name_regex.match("typedef enum LDKNetwork {"))
1586     struct_alias_regex = re.compile("^typedef (LDK[A-Za-z_0-9]*) (LDK[A-Za-z_0-9]*);$")
1587     assert(struct_alias_regex.match("typedef LDKCResultTempl_bool__PeerHandleError LDKCResult_boolPeerHandleErrorZ;"))
1588
1589     result_templ_structs = set()
1590     union_enum_items = {}
1591     result_ptr_struct_items = {}
1592     for line in in_h:
1593         if in_block_comment:
1594             if line.endswith("*/\n"):
1595                 in_block_comment = False
1596         elif cur_block_obj is not None:
1597             cur_block_obj  = cur_block_obj + line
1598             if line.startswith("} "):
1599                 field_lines = []
1600                 struct_name = None
1601                 vec_ty = None
1602                 obj_lines = cur_block_obj.split("\n")
1603                 is_opaque = False
1604                 result_contents = None
1605                 is_unitary_enum = False
1606                 is_union_enum = False
1607                 is_union = False
1608                 is_tuple = False
1609                 trait_fn_lines = []
1610                 field_var_lines = []
1611
1612                 for idx, struct_line in enumerate(obj_lines):
1613                     if struct_line.strip().startswith("/*"):
1614                         in_block_comment = True
1615                     if in_block_comment:
1616                         if struct_line.endswith("*/"):
1617                             in_block_comment = False
1618                     else:
1619                         struct_name_match = struct_name_regex.match(struct_line)
1620                         if struct_name_match is not None:
1621                             struct_name = struct_name_match.group(3)
1622                             if struct_name_match.group(1) == "enum":
1623                                 if not struct_name.endswith("_Tag"):
1624                                     is_unitary_enum = True
1625                                 else:
1626                                     is_union_enum = True
1627                             elif struct_name_match.group(1) == "union":
1628                                 is_union = True
1629                         if line_indicates_opaque_regex.match(struct_line):
1630                             is_opaque = True
1631                         result_match = line_indicates_result_regex.match(struct_line)
1632                         if result_match is not None:
1633                             result_contents = result_match.group(1)
1634                         vec_ty_match = line_indicates_vec_regex.match(struct_line)
1635                         if vec_ty_match is not None and struct_name.startswith("LDKCVecTempl_"):
1636                             vec_ty = vec_ty_match.group(1)
1637                         elif struct_name.startswith("LDKC2TupleTempl_") or struct_name.startswith("LDKC3TupleTempl_"):
1638                             is_tuple = True
1639                         trait_fn_match = line_indicates_trait_regex.match(struct_line)
1640                         if trait_fn_match is not None:
1641                             trait_fn_lines.append(trait_fn_match)
1642                         field_var_match = line_field_var_regex.match(struct_line)
1643                         if field_var_match is not None:
1644                             field_var_lines.append(field_var_match)
1645                         field_lines.append(struct_line)
1646
1647                 assert(struct_name is not None)
1648                 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))
1649                 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))
1650                 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))
1651                 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))
1652                 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))
1653                 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))
1654                 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))
1655
1656                 if is_opaque:
1657                     opaque_structs.add(struct_name)
1658                     with open(sys.argv[3] + "/structs/" + struct_name.replace("LDK","") + ".java", "w") as out_java_struct:
1659                         out_java_struct.write(hu_struct_file_prefix)
1660                         out_java_struct.write("public class " + struct_name.replace("LDK","") + " extends CommonBase")
1661                         if struct_name.startswith("LDKLocked"):
1662                             out_java_struct.write(" implements AutoCloseable")
1663                         out_java_struct.write(" {\n")
1664                         out_java_struct.write("\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); }\n")
1665                         if struct_name.startswith("LDKLocked"):
1666                             out_java_struct.write("\t@Override public void close() {\n")
1667                         else:
1668                             out_java_struct.write("\t@Override @SuppressWarnings(\"deprecation\")\n")
1669                             out_java_struct.write("\tprotected void finalize() throws Throwable {\n")
1670                             out_java_struct.write("\t\tsuper.finalize();\n")
1671                         out_java_struct.write("\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); }\n")
1672                         out_java_struct.write("\t}\n\n")
1673                 elif result_contents is not None:
1674                     result_templ_structs.add(struct_name)
1675                     assert result_contents in result_ptr_struct_items
1676                 elif struct_name.startswith("LDKCResultPtr_"):
1677                     for line in field_lines:
1678                         if line.endswith("*result;"):
1679                             res_ty = line[:-8].strip()
1680                         elif line.endswith("*err;"):
1681                             err_ty = line[:-5].strip()
1682                     result_ptr_struct_items[struct_name] = (res_ty, err_ty)
1683                 elif is_tuple:
1684                     out_java.write("\tpublic static native long " + struct_name + "_new(")
1685                     write_c("JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1new(JNIEnv *_env, jclass _b")
1686                     ty_list = []
1687                     for idx, line in enumerate(field_lines):
1688                         if idx != 0 and idx < len(field_lines) - 2:
1689                             ty_info = java_c_types(line.strip(';'), None)
1690                             if idx != 1:
1691                                 out_java.write(", ")
1692                             e = chr(ord('a') + idx - 1)
1693                             out_java.write(ty_info.java_ty + " " + e)
1694                             write_c(", " + ty_info.c_ty + " " + e)
1695                             ty_list.append(ty_info)
1696                     tuple_types[struct_name] = (ty_list, struct_name)
1697                     out_java.write(");\n")
1698                     write_c(") {\n")
1699                     write_c("\t" + struct_name + "* ret = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n")
1700                     for idx, line in enumerate(field_lines):
1701                         if idx != 0 and idx < len(field_lines) - 2:
1702                             ty_info = map_type(line.strip(';'), False, None, False, False)
1703                             e = chr(ord('a') + idx - 1)
1704                             if ty_info.arg_conv is not None:
1705                                 write_c("\t" + ty_info.arg_conv.replace("\n", "\n\t"))
1706                                 write_c("\n\tret->" + e + " = " + ty_info.arg_conv_name + ";\n")
1707                             else:
1708                                 write_c("\tret->" + e + " = " + e + ";\n")
1709                             if ty_info.arg_conv_cleanup is not None:
1710                                 write_c("\t//TODO: Really need to call " + ty_info.arg_conv_cleanup + " here\n")
1711                     write_c("\treturn (long)ret;\n")
1712                     write_c("}\n")
1713                 elif vec_ty is not None:
1714                     if vec_ty in opaque_structs:
1715                         out_java.write("\tpublic static native long[] " + struct_name + "_arr_info(long vec_ptr);\n")
1716                         write_c("JNIEXPORT jlongArray JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1arr_1info(JNIEnv *env, jclass _b, jlong ptr) {\n")
1717                     else:
1718                         out_java.write("\tpublic static native VecOrSliceDef " + struct_name + "_arr_info(long vec_ptr);\n")
1719                         write_c("JNIEXPORT jobject JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1arr_1info(JNIEnv *env, jclass _b, jlong ptr) {\n")
1720                     write_c("\t" + struct_name + " *vec = (" + struct_name + "*)ptr;\n")
1721                     if vec_ty in opaque_structs:
1722                         write_c("\tjlongArray ret = (*env)->NewLongArray(env, vec->datalen);\n")
1723                         write_c("\tjlong *ret_elems = (*env)->GetPrimitiveArrayCritical(env, ret, NULL);\n")
1724                         write_c("\tfor (size_t i = 0; i < vec->datalen; i++) {\n")
1725                         write_c("\t\tCHECK((((long)vec->data[i].inner) & 1) == 0);\n")
1726                         write_c("\t\tret_elems[i] = (long)vec->data[i].inner | (vec->data[i].is_owned ? 1 : 0);\n")
1727                         write_c("\t}\n")
1728                         write_c("\t(*env)->ReleasePrimitiveArrayCritical(env, ret, ret_elems, 0);\n")
1729                         write_c("\treturn ret;\n")
1730                     else:
1731                         write_c("\treturn (*env)->NewObject(env, slicedef_cls, slicedef_meth, (long)vec->data, (long)vec->datalen, sizeof(" + vec_ty + "));\n")
1732                     write_c("}\n")
1733
1734                     ty_info = map_type(vec_ty + " arr_elem", False, None, False, False)
1735                     if len(ty_info.java_fn_ty_arg) == 1: # ie we're a primitive of some form
1736                         out_java.write("\tpublic static native long " + struct_name + "_new(" + ty_info.java_ty + "[] elems);\n")
1737                         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")
1738                         write_c("\t" + struct_name + " *ret = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n")
1739                         write_c("\tret->datalen = (*env)->GetArrayLength(env, elems);\n")
1740                         write_c("\tif (ret->datalen == 0) {\n")
1741                         write_c("\t\tret->data = NULL;\n")
1742                         write_c("\t} else {\n")
1743                         write_c("\t\tret->data = MALLOC(sizeof(" + vec_ty + ") * ret->datalen, \"" + struct_name + " Data\");\n")
1744                         write_c("\t\t" + ty_info.c_ty + " *java_elems = (*env)->GetPrimitiveArrayCritical(env, elems, NULL);\n")
1745                         write_c("\t\tfor (size_t i = 0; i < ret->datalen; i++) {\n")
1746                         if ty_info.arg_conv is not None:
1747                             write_c("\t\t\t" + ty_info.c_ty + " arr_elem = java_elems[i];\n")
1748                             write_c("\t\t\t" + ty_info.arg_conv.replace("\n", "\n\t\t\t") + "\n")
1749                             write_c("\t\t\tret->data[i] = " + ty_info.arg_conv_name + ";\n")
1750                             assert ty_info.arg_conv_cleanup is None
1751                         else:
1752                             write_c("\t\t\tret->data[i] = java_elems[i];\n")
1753                         write_c("\t\t}\n")
1754                         write_c("\t\t(*env)->ReleasePrimitiveArrayCritical(env, elems, java_elems, 0);\n")
1755                         write_c("\t}\n")
1756                         write_c("\treturn (long)ret;\n")
1757                         write_c("}\n")
1758                 elif is_union_enum:
1759                     assert(struct_name.endswith("_Tag"))
1760                     struct_name = struct_name[:-4]
1761                     union_enum_items[struct_name] = {"field_lines": field_lines}
1762                 elif struct_name.endswith("_Body") and struct_name.split("_")[0] in union_enum_items:
1763                     enum_var_name = struct_name.split("_")
1764                     union_enum_items[enum_var_name[0]][enum_var_name[1]] = field_lines
1765                 elif struct_name in union_enum_items:
1766                     map_complex_enum(struct_name, union_enum_items[struct_name])
1767                 elif is_unitary_enum:
1768                     map_unitary_enum(struct_name, field_lines)
1769                 elif len(trait_fn_lines) > 0:
1770                     trait_structs.add(struct_name)
1771                     map_trait(struct_name, field_var_lines, trait_fn_lines)
1772                 elif struct_name == "LDKTxOut":
1773                     with open(sys.argv[3] + "/structs/TxOut.java", "w") as out_java_struct:
1774                         out_java_struct.write(hu_struct_file_prefix)
1775                         out_java_struct.write("public class TxOut extends CommonBase{\n")
1776                         out_java_struct.write("\tTxOut(java.lang.Object _dummy, long ptr) { super(ptr); }\n")
1777                         out_java_struct.write("\tlong to_c_ptr() { return 0; }\n")
1778                         # TODO: TxOut body
1779                         out_java_struct.write("}")
1780                 elif struct_name == "LDKTransaction":
1781                     with open(sys.argv[3] + "/structs/Transaction.java", "w") as out_java_struct:
1782                         out_java_struct.write(hu_struct_file_prefix)
1783                         out_java_struct.write("public class Transaction extends CommonBase{\n")
1784                         out_java_struct.write("\tTransaction(java.lang.Object _dummy, long ptr) { super(ptr); }\n")
1785                         out_java_struct.write("\tpublic Transaction(byte[] data) { super(bindings.new_txpointer_copy_data(data)); }\n")
1786                         out_java_struct.write("\t@Override public void finalize() throws Throwable { super.finalize(); bindings.txpointer_free(ptr); }\n")
1787                         out_java_struct.write("\tpublic byte[] get_contents() { return bindings.txpointer_get_buffer(ptr); }\n")
1788                         # TODO: Transaction body
1789                         out_java_struct.write("}")
1790                 else:
1791                     pass # Everything remaining is a byte[] or some form
1792                 cur_block_obj = None
1793         else:
1794             fn_ptr = fn_ptr_regex.match(line)
1795             fn_ret_arr = fn_ret_arr_regex.match(line)
1796             reg_fn = reg_fn_regex.match(line)
1797             const_val = const_val_regex.match(line)
1798
1799             if line.startswith("#include <"):
1800                 pass
1801             elif line.startswith("/*"):
1802                 #out_java.write("\t" + line)
1803                 if not line.endswith("*/\n"):
1804                     in_block_comment = True
1805             elif line.startswith("typedef enum "):
1806                 cur_block_obj = line
1807             elif line.startswith("typedef struct "):
1808                 cur_block_obj = line
1809             elif line.startswith("typedef union "):
1810                 cur_block_obj = line
1811             elif line.startswith("typedef "):
1812                 alias_match =  struct_alias_regex.match(line)
1813                 if alias_match.group(1) in tuple_types:
1814                     tuple_types[alias_match.group(2)] = (tuple_types[alias_match.group(1)][0], alias_match.group(2))
1815                     tuple_types[alias_match.group(1)] = (tuple_types[alias_match.group(1)][0], alias_match.group(2))
1816                     for idx, ty_info in enumerate(tuple_types[alias_match.group(1)][0]):
1817                         e = chr(ord('a') + idx)
1818                         out_java.write("\tpublic static native " + ty_info.java_ty + " " + alias_match.group(2) + "_get_" + e + "(long ptr);\n")
1819                         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")
1820                         write_c("\t" + alias_match.group(1) + " *tuple = (" + alias_match.group(1) + "*)ptr;\n")
1821                         conv_info = map_type_with_info(ty_info, False, None, False, True)
1822                         if conv_info.ret_conv is not None:
1823                             write_c("\t" + conv_info.ret_conv[0].replace("\n", "\n\t") + "tuple->" + e + conv_info.ret_conv[1].replace("\n", "\n\t") + "\n")
1824                             write_c("\treturn " + conv_info.ret_conv_name + ";\n")
1825                         else:
1826                             write_c("\treturn tuple->" + e + ";\n")
1827                         write_c("}\n")
1828                 elif alias_match.group(1) in result_templ_structs:
1829                     result_types.add(alias_match.group(2))
1830                     human_ty = alias_match.group(2).replace("LDKCResult", "Result")
1831                     with open(sys.argv[3] + "/structs/" + human_ty + ".java", "w") as out_java_struct:
1832                         out_java_struct.write(hu_struct_file_prefix)
1833                         out_java_struct.write("public class " + human_ty + " extends CommonBase {\n")
1834                         out_java_struct.write("\tprivate " + human_ty + "(Object _dummy, long ptr) { super(ptr); }\n")
1835                         out_java_struct.write("\tprotected void finalize() throws Throwable {\n")
1836                         out_java_struct.write("\t\tif (ptr != 0) { bindings." + alias_match.group(2).replace("LDK","") + "_free(ptr); } super.finalize();\n")
1837                         out_java_struct.write("\t}\n\n")
1838                         out_java_struct.write("\tstatic " + human_ty + " constr_from_ptr(long ptr) {\n")
1839                         out_java_struct.write("\t\tif (bindings." + alias_match.group(2) + "_result_ok(ptr)) {\n")
1840                         out_java_struct.write("\t\t\treturn new " + human_ty + "_OK(null, ptr);\n")
1841                         out_java_struct.write("\t\t} else {\n")
1842                         out_java_struct.write("\t\t\treturn new " + human_ty + "_Err(null, ptr);\n")
1843                         out_java_struct.write("\t\t}\n")
1844                         out_java_struct.write("\t}\n")
1845
1846                         contents_ty = alias_match.group(1).replace("LDKCResultTempl", "LDKCResultPtr")
1847                         res_ty, err_ty = result_ptr_struct_items[contents_ty]
1848                         res_map = map_type(res_ty + " res", True, None, False, True)
1849                         err_map = map_type(err_ty + " err", True, None, False, True)
1850
1851                         out_java.write("\tpublic static native boolean " + alias_match.group(2) + "_result_ok(long arg);\n")
1852                         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")
1853                         write_c("\treturn ((" + alias_match.group(2) + "*)arg)->result_ok;\n")
1854                         write_c("}\n")
1855
1856                         out_java.write("\tpublic static native " + res_map.java_ty + " " + alias_match.group(2) + "_get_ok(long arg);\n")
1857                         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")
1858                         write_c("\t" + alias_match.group(2) + " *val = (" + alias_match.group(2) + "*)arg;\n")
1859                         write_c("\tCHECK(val->result_ok);\n\t")
1860                         out_java_struct.write("\tpublic static final class " + human_ty + "_OK extends " + human_ty + " {\n")
1861                         if res_map.ret_conv is not None:
1862                             write_c(res_map.ret_conv[0].replace("\n", "\n\t") + "(*val->contents.result)")
1863                             write_c(res_map.ret_conv[1].replace("\n", "\n\t") + "\n\treturn " + res_map.ret_conv_name)
1864                         else:
1865                             write_c("return *val->contents.result")
1866                         write_c(";\n}\n")
1867
1868                         out_java_struct.write("\t\tpublic final " + res_map.java_hu_ty + " res;\n")
1869                         out_java_struct.write("\t\tprivate " + human_ty + "_OK(Object _dummy, long ptr) {\n")
1870                         out_java_struct.write("\t\t\tsuper(_dummy, ptr);\n")
1871                         if res_map.to_hu_conv is not None:
1872                             out_java_struct.write("\t\t\t" + res_map.java_ty + " res = bindings." + alias_match.group(2) + "_get_ok(ptr);\n")
1873                             out_java_struct.write("\t\t\t" + res_map.to_hu_conv.replace("\n", "\n\t\t\t"))
1874                             out_java_struct.write("\n\t\t\tthis.res = " + res_map.to_hu_conv_name + ";\n")
1875                         else:
1876                             out_java_struct.write("\t\t\tthis.res = bindings." + alias_match.group(2) + "_get_ok(ptr);\n")
1877                         out_java_struct.write("\t\t}\n")
1878                         if alias_match.group(2).startswith("LDKCResult_None"):
1879                             out_java_struct.write("\t\tpublic " + human_ty + "_OK() {\n\t\t\tthis(null, bindings.C" + human_ty + "_ok());\n")
1880                         else:
1881                             out_java_struct.write("\t\tpublic " + human_ty + "_OK(" + res_map.java_hu_ty + " res) {\n")
1882                             if res_map.from_hu_conv is not None:
1883                                 out_java_struct.write("\t\t\tthis(null, bindings.C" + human_ty + "_ok(" + res_map.from_hu_conv[0] + "));\n")
1884                                 if res_map.from_hu_conv[1] != "":
1885                                     out_java_struct.write("\t\t\t" + res_map.from_hu_conv[1] + ";\n")
1886                             else:
1887                                 out_java_struct.write("\t\t\tthis(null, bindings.C" + human_ty + "_ok(res));\n")
1888                         out_java_struct.write("\t\t}\n\t}\n\n")
1889
1890                         out_java.write("\tpublic static native " + err_map.java_ty + " " + alias_match.group(2) + "_get_err(long arg);\n")
1891                         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")
1892                         write_c("\t" + alias_match.group(2) + " *val = (" + alias_match.group(2) + "*)arg;\n")
1893                         write_c("\tCHECK(!val->result_ok);\n\t")
1894                         out_java_struct.write("\tpublic static final class " + human_ty + "_Err extends " + human_ty + " {\n")
1895                         if err_map.ret_conv is not None:
1896                             write_c(err_map.ret_conv[0].replace("\n", "\n\t") + "(*val->contents.err)")
1897                             write_c(err_map.ret_conv[1].replace("\n", "\n\t") + "\n\treturn " + err_map.ret_conv_name)
1898                         else:
1899                             write_c("return *val->contents.err")
1900                         write_c(";\n}\n")
1901
1902                         out_java_struct.write("\t\tpublic final " + err_map.java_hu_ty + " err;\n")
1903                         out_java_struct.write("\t\tprivate " + human_ty + "_Err(Object _dummy, long ptr) {\n")
1904                         out_java_struct.write("\t\t\tsuper(_dummy, ptr);\n")
1905                         if err_map.to_hu_conv is not None:
1906                             out_java_struct.write("\t\t\t" + err_map.java_ty + " err = bindings." + alias_match.group(2) + "_get_err(ptr);\n")
1907                             out_java_struct.write("\t\t\t" + err_map.to_hu_conv.replace("\n", "\n\t\t\t"))
1908                             out_java_struct.write("\n\t\t\tthis.err = " + err_map.to_hu_conv_name + ";\n")
1909                         else:
1910                             out_java_struct.write("\t\t\tthis.err = bindings." + alias_match.group(2) + "_get_err(ptr);\n")
1911                         out_java_struct.write("\t\t}\n")
1912
1913                         if alias_match.group(2).endswith("NoneZ"):
1914                             out_java_struct.write("\t\tpublic " + human_ty + "_Err() {\n\t\t\tthis(null, bindings.C" + human_ty + "_err());\n")
1915                         else:
1916                             out_java_struct.write("\t\tpublic " + human_ty + "_Err(" + err_map.java_hu_ty + " err) {\n")
1917                             if err_map.from_hu_conv is not None:
1918                                 out_java_struct.write("\t\t\tthis(null, bindings.C" + human_ty + "_err(" + err_map.from_hu_conv[0] + "));\n")
1919                                 if err_map.from_hu_conv[1] != "":
1920                                     out_java_struct.write("\t\t\t" + err_map.from_hu_conv[1] + ";\n")
1921                             else:
1922                                 out_java_struct.write("\t\t\tthis(null, bindings.C" + human_ty + "_err(err));\n")
1923                         out_java_struct.write("\t\t}\n\t}\n}\n")
1924             elif fn_ptr is not None:
1925                 map_fn(line, fn_ptr, None, None)
1926             elif fn_ret_arr is not None:
1927                 map_fn(line, fn_ret_arr, fn_ret_arr.group(4), None)
1928             elif reg_fn is not None:
1929                 map_fn(line, reg_fn, None, None)
1930             elif const_val_regex is not None:
1931                 # TODO Map const variables
1932                 pass
1933             else:
1934                 assert(line == "\n")
1935
1936     out_java.write("}\n")
1937     for struct_name in opaque_structs:
1938         with open(sys.argv[3] + "/structs/" + struct_name.replace("LDK","") + ".java", "a") as out_java_struct:
1939             out_java_struct.write("}\n")
1940     for struct_name in trait_structs:
1941         with open(sys.argv[3] + "/structs/" + struct_name.replace("LDK","") + ".java", "a") as out_java_struct:
1942             out_java_struct.write("}\n")
1943 with open(sys.argv[4], "w") as out_c:
1944     out_c.write(c_file_pfx)
1945     for ty in c_array_class_caches:
1946         if ty + "_clz" in c_file:
1947             out_c.write("static jclass " + ty + "_clz = NULL;\n")
1948     out_c.write("JNIEXPORT void Java_org_ldk_impl_bindings_init_1class_1cache(JNIEnv * env, jclass _b) {\n")
1949     for ty in c_array_class_caches:
1950         if ty + "_clz" in c_file:
1951             out_c.write("\t" + ty + "_clz = (*env)->FindClass(env, \"" + ty.replace("arr_of_", "[") + "\");\n")
1952             out_c.write("\tCHECK(" + ty + "_clz != NULL);\n")
1953             out_c.write("\t" + ty + "_clz = (*env)->NewGlobalRef(env, " + ty + "_clz);\n")
1954     out_c.write("}\n")
1955     out_c.write(c_file)