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

   1 #!/usr/bin/env python3
   2 import sys, re
   3
   4 if len(sys.argv) != 6:
   5     print("USAGE: /path/to/lightning.h /path/to/bindings/output.java /path/to/bindings/ /path/to/bindings/output.c debug")
   6     print("debug should be true or false and indicates whether to track allocations and ensure we don't leak")
   7     sys.exit(1)
   8
   9 hu_struct_file_prefix = """package org.ldk.structs;
  10
  11 import org.ldk.impl.bindings;
  12 import org.ldk.enums.*;
  13 import org.ldk.util.*;
  14 import java.util.Arrays;
  15
  16 @SuppressWarnings("unchecked") // We correctly assign various generic arrays
  17 """
  18
  19 c_file_pfx = """#include \"org_ldk_impl_bindings.h\"
  20 #include <rust_types.h>
  21 #include <lightning.h>
  22 #include <string.h>
  23 #include <stdatomic.h>
  24 """
  25
  26 if sys.argv[5] == "false":
  27     c_file_pfx = c_file_pfx + """#define MALLOC(a, _) malloc(a)
  28 #define FREE(p) if ((long)(p) > 1024) { free(p); }
  29 #define DO_ASSERT(a) (void)(a)
  30 #define CHECK(a)
  31 """
  32 else:
  33     c_file_pfx = c_file_pfx + """#include <assert.h>
  34 // Always run a, then assert it is true:
  35 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
  36 // Assert a is true or do nothing
  37 #define CHECK(a) DO_ASSERT(a)
  38
  39 // Running a leak check across all the allocations and frees of the JDK is a mess,
  40 // so instead we implement our own naive leak checker here, relying on the -wrap
  41 // linker option to wrap malloc/calloc/realloc/free, tracking everyhing allocated
  42 // and free'd in Rust or C across the generated bindings shared library.
  43 #include <threads.h>
  44 #include <execinfo.h>
  45 #include <unistd.h>
  46 static mtx_t allocation_mtx;
  47
  48 void __attribute__((constructor)) init_mtx() {
  49         DO_ASSERT(mtx_init(&allocation_mtx, mtx_plain) == thrd_success);
  50 }
  51
  52 #define BT_MAX 128
  53 typedef struct allocation {
  54         struct allocation* next;
  55         void* ptr;
  56         const char* struct_name;
  57         void* bt[BT_MAX];
  58         int bt_len;
  59 } allocation;
  60 static allocation* allocation_ll = NULL;
  61
  62 void* __real_malloc(size_t len);
  63 void* __real_calloc(size_t nmemb, size_t len);
  64 static void new_allocation(void* res, const char* struct_name) {
  65         allocation* new_alloc = __real_malloc(sizeof(allocation));
  66         new_alloc->ptr = res;
  67         new_alloc->struct_name = struct_name;
  68         new_alloc->bt_len = backtrace(new_alloc->bt, BT_MAX);
  69         DO_ASSERT(mtx_lock(&allocation_mtx) == thrd_success);
  70         new_alloc->next = allocation_ll;
  71         allocation_ll = new_alloc;
  72         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
  73 }
  74 static void* MALLOC(size_t len, const char* struct_name) {
  75         void* res = __real_malloc(len);
  76         new_allocation(res, struct_name);
  77         return res;
  78 }
  79 void __real_free(void* ptr);
  80 static void alloc_freed(void* ptr) {
  81         allocation* p = NULL;
  82         DO_ASSERT(mtx_lock(&allocation_mtx) == thrd_success);
  83         allocation* it = allocation_ll;
  84         while (it->ptr != ptr) {
  85                 p = it; it = it->next;
  86                 if (it == NULL) {
  87                         fprintf(stderr, "Tried to free unknown pointer %p at:\\n", ptr);
  88                         void* bt[BT_MAX];
  89                         int bt_len = backtrace(bt, BT_MAX);
  90                         backtrace_symbols_fd(bt, bt_len, STDERR_FILENO);
  91                         fprintf(stderr, "\\n\\n");
  92                         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
  93                         return; // addrsan should catch malloc-unknown and print more info than we have
  94                 }
  95         }
  96         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
  97         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
  98         DO_ASSERT(it->ptr == ptr);
  99         __real_free(it);
 100 }
 101 static void FREE(void* ptr) {
 102         if ((long)ptr < 1024) return; // Rust loves to create pointers to the NULL page for dummys
 103         alloc_freed(ptr);
 104         __real_free(ptr);
 105 }
 106
 107 void* __wrap_malloc(size_t len) {
 108         void* res = __real_malloc(len);
 109         new_allocation(res, "malloc call");
 110         return res;
 111 }
 112 void* __wrap_calloc(size_t nmemb, size_t len) {
 113         void* res = __real_calloc(nmemb, len);
 114         new_allocation(res, "calloc call");
 115         return res;
 116 }
 117 void __wrap_free(void* ptr) {
 118         if (ptr == NULL) return;
 119         alloc_freed(ptr);
 120         __real_free(ptr);
 121 }
 122
 123 void* __real_realloc(void* ptr, size_t newlen);
 124 void* __wrap_realloc(void* ptr, size_t len) {
 125         if (ptr != NULL) alloc_freed(ptr);
 126         void* res = __real_realloc(ptr, len);
 127         new_allocation(res, "realloc call");
 128         return res;
 129 }
 130 void __wrap_reallocarray(void* ptr, size_t new_sz) {
 131         // Rust doesn't seem to use reallocarray currently
 132         assert(false);
 133 }
 134
 135 void __attribute__((destructor)) check_leaks() {
 136         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 137                 fprintf(stderr, "%s %p remains:\\n", a->struct_name, a->ptr);
 138                 backtrace_symbols_fd(a->bt, a->bt_len, STDERR_FILENO);
 139                 fprintf(stderr, "\\n\\n");
 140         }
 141         DO_ASSERT(allocation_ll == NULL);
 142 }
 143 """
 144
 145 c_file = ""
 146 def write_c(s):
 147     global c_file
 148     c_file += s
 149
 150 class TypeInfo:
 151     def __init__(self, is_native_primitive, rust_obj, java_ty, java_fn_ty_arg, java_hu_ty, c_ty, passed_as_ptr, is_ptr, var_name, arr_len, arr_access, subty=None):
 152         self.is_native_primitive = is_native_primitive
 153         self.rust_obj = rust_obj
 154         self.java_ty = java_ty
 155         self.java_hu_ty = java_hu_ty
 156         self.java_fn_ty_arg = java_fn_ty_arg
 157         self.c_ty = c_ty
 158         self.passed_as_ptr = passed_as_ptr
 159         self.is_ptr = is_ptr
 160         self.var_name = var_name
 161         self.arr_len = arr_len
 162         self.arr_access = arr_access
 163         self.subty = subty
 164         self.pass_by_ref = is_ptr
 165         self.requires_clone = None
 166
 167 class ConvInfo:
 168     def __init__(self, ty_info, arg_name, arg_conv, arg_conv_name, arg_conv_cleanup, ret_conv, ret_conv_name, to_hu_conv, to_hu_conv_name, from_hu_conv):
 169         assert(ty_info.c_ty is not None)
 170         assert(ty_info.java_ty is not None)
 171         assert(arg_name is not None)
 172         self.passed_as_ptr = ty_info.passed_as_ptr
 173         self.rust_obj = ty_info.rust_obj
 174         self.c_ty = ty_info.c_ty
 175         self.java_ty = ty_info.java_ty
 176         self.java_hu_ty = ty_info.java_hu_ty
 177         self.java_fn_ty_arg = ty_info.java_fn_ty_arg
 178         self.arg_name = arg_name
 179         self.arg_conv = arg_conv
 180         self.arg_conv_name = arg_conv_name
 181         self.arg_conv_cleanup = arg_conv_cleanup
 182         self.ret_conv = ret_conv
 183         self.ret_conv_name = ret_conv_name
 184         self.to_hu_conv = to_hu_conv
 185         self.to_hu_conv_name = to_hu_conv_name
 186         self.from_hu_conv = from_hu_conv
 187
 188     def print_ty(self):
 189         write_c(self.c_ty)
 190         out_java.write(self.java_ty)
 191
 192     def print_name(self):
 193         if self.arg_name != "":
 194             out_java.write(" " + self.arg_name)
 195             write_c(" " + self.arg_name)
 196         else:
 197             out_java.write(" arg")
 198             write_c(" arg")
 199
 200 def camel_to_snake(s):
 201     # Convert camel case to snake case, in a way that appears to match cbindgen
 202     con = "_"
 203     ret = ""
 204     lastchar = ""
 205     lastund = False
 206     for char in s:
 207         if lastchar.isupper():
 208             if not char.isupper() and not lastund:
 209                 ret = ret + "_"
 210                 lastund = True
 211             else:
 212                 lastund = False
 213             ret = ret + lastchar.lower()
 214         else:
 215             ret = ret + lastchar
 216             if char.isupper() and not lastund:
 217                 ret = ret + "_"
 218                 lastund = True
 219             else:
 220                 lastund = False
 221         lastchar = char
 222         if char.isnumeric():
 223             lastund = True
 224     return (ret + lastchar.lower()).strip("_")
 225
 226 unitary_enums = set()
 227 complex_enums = set()
 228 opaque_structs = set()
 229 trait_structs = set()
 230 result_types = set()
 231 tuple_types = {}
 232
 233 def is_common_base_ext(struct_name):
 234     return struct_name in complex_enums or struct_name in opaque_structs or struct_name in trait_structs or struct_name in result_types
 235
 236 var_is_arr_regex = re.compile("\(\*([A-za-z0-9_]*)\)\[([a-z0-9]*)\]")
 237 var_ty_regex = re.compile("([A-za-z_0-9]*)(.*)")
 238 java_c_types_none_allowed = True # Unset when we do the real pass that populates the above sets
 239 def java_c_types(fn_arg, ret_arr_len):
 240     fn_arg = fn_arg.strip()
 241     if fn_arg.startswith("MUST_USE_RES "):
 242         fn_arg = fn_arg[13:]
 243     is_const = False
 244     if fn_arg.startswith("const "):
 245         fn_arg = fn_arg[6:]
 246         is_const = True
 247
 248     is_ptr = False
 249     take_by_ptr = False
 250     rust_obj = None
 251     arr_access = None
 252     java_hu_ty = None
 253     if fn_arg.startswith("LDKThirtyTwoBytes"):
 254         fn_arg = "uint8_t (*" + fn_arg[18:] + ")[32]"
 255         assert var_is_arr_regex.match(fn_arg[8:])
 256         rust_obj = "LDKThirtyTwoBytes"
 257         arr_access = "data"
 258     elif fn_arg.startswith("LDKPublicKey"):
 259         fn_arg = "uint8_t (*" + fn_arg[13:] + ")[33]"
 260         assert var_is_arr_regex.match(fn_arg[8:])
 261         rust_obj = "LDKPublicKey"
 262         arr_access = "compressed_form"
 263     elif fn_arg.startswith("LDKSecretKey"):
 264         fn_arg = "uint8_t (*" + fn_arg[13:] + ")[32]"
 265         assert var_is_arr_regex.match(fn_arg[8:])
 266         rust_obj = "LDKSecretKey"
 267         arr_access = "bytes"
 268     elif fn_arg.startswith("LDKSignature"):
 269         fn_arg = "uint8_t (*" + fn_arg[13:] + ")[64]"
 270         assert var_is_arr_regex.match(fn_arg[8:])
 271         rust_obj = "LDKSignature"
 272         arr_access = "compact_form"
 273     elif fn_arg.startswith("LDKThreeBytes"):
 274         fn_arg = "uint8_t (*" + fn_arg[14:] + ")[3]"
 275         assert var_is_arr_regex.match(fn_arg[8:])
 276         rust_obj = "LDKThreeBytes"
 277         arr_access = "data"
 278     elif fn_arg.startswith("LDKFourBytes"):
 279         fn_arg = "uint8_t (*" + fn_arg[13:] + ")[4]"
 280         assert var_is_arr_regex.match(fn_arg[8:])
 281         rust_obj = "LDKFourBytes"
 282         arr_access = "data"
 283     elif fn_arg.startswith("LDKSixteenBytes"):
 284         fn_arg = "uint8_t (*" + fn_arg[16:] + ")[16]"
 285         assert var_is_arr_regex.match(fn_arg[8:])
 286         rust_obj = "LDKSixteenBytes"
 287         arr_access = "data"
 288     elif fn_arg.startswith("LDKTenBytes"):
 289         fn_arg = "uint8_t (*" + fn_arg[12:] + ")[10]"
 290         assert var_is_arr_regex.match(fn_arg[8:])
 291         rust_obj = "LDKTenBytes"
 292         arr_access = "data"
 293     elif fn_arg.startswith("LDKu8slice"):
 294         fn_arg = "uint8_t (*" + fn_arg[11:] + ")[datalen]"
 295         assert var_is_arr_regex.match(fn_arg[8:])
 296         rust_obj = "LDKu8slice"
 297         arr_access = "data"
 298     elif fn_arg.startswith("LDKCVecTempl_u8") or fn_arg.startswith("LDKCVec_u8Z"):
 299         if fn_arg.startswith("LDKCVecTempl_u8"):
 300             fn_arg = "uint8_t (*" + fn_arg[16:] + ")[datalen]"
 301             rust_obj = "LDKCVecTempl_u8"
 302             assert var_is_arr_regex.match(fn_arg[8:])
 303         else:
 304             fn_arg = "uint8_t (*" + fn_arg[12:] + ")[datalen]"
 305             rust_obj = "LDKCVec_u8Z"
 306             assert var_is_arr_regex.match(fn_arg[8:])
 307         arr_access = "data"
 308     elif fn_arg.startswith("LDKTransaction"):
 309         fn_arg = "uint8_t (*" + fn_arg[15:] + ")[datalen]"
 310         rust_obj = "LDKTransaction"
 311         assert var_is_arr_regex.match(fn_arg[8:])
 312         arr_access = "data"
 313     elif fn_arg.startswith("LDKCVecTempl_") or fn_arg.startswith("LDKCVec_"):
 314         is_ptr = False
 315         if "*" in fn_arg:
 316             fn_arg = fn_arg.replace("*", "")
 317             is_ptr = True
 318
 319         if fn_arg.startswith("LDKCVec_"):
 320             tyn = fn_arg[8:].split(" ")
 321             assert tyn[0].endswith("Z")
 322             if tyn[0] == "u64Z":
 323                 new_arg = "uint64_t"
 324             else:
 325                 new_arg = "LDK" + tyn[0][:-1]
 326             for a in tyn[1:]:
 327                 new_arg = new_arg + " " + a
 328             res = java_c_types(new_arg, ret_arr_len)
 329         else:
 330             res = java_c_types("LDK" + fn_arg[13:], ret_arr_len)
 331         if res is None:
 332             assert java_c_types_none_allowed
 333             return None
 334         if is_ptr:
 335             res.pass_by_ref = True
 336         if res.is_native_primitive or res.passed_as_ptr:
 337             return TypeInfo(rust_obj=fn_arg.split(" ")[0], java_ty=res.java_ty + "[]", java_hu_ty=res.java_hu_ty + "[]",
 338                 java_fn_ty_arg="[" + res.java_fn_ty_arg, c_ty=res.c_ty + "Array", passed_as_ptr=False, is_ptr=is_ptr,
 339                 var_name=res.var_name, arr_len="datalen", arr_access="data", subty=res, is_native_primitive=False)
 340         else:
 341             return TypeInfo(rust_obj=fn_arg.split(" ")[0], java_ty=res.java_ty + "[]", java_hu_ty=res.java_hu_ty + "[]",
 342                 java_fn_ty_arg="[" + res.java_fn_ty_arg, c_ty="jobjectArray", passed_as_ptr=False, is_ptr=is_ptr,
 343                 var_name=res.var_name, arr_len="datalen", arr_access="data", subty=res, is_native_primitive=False)
 344
 345     is_primitive = False
 346     arr_len = None
 347     if fn_arg.startswith("void"):
 348         java_ty = "void"
 349         c_ty = "void"
 350         fn_ty_arg = "V"
 351         fn_arg = fn_arg[4:].strip()
 352         is_primitive = True
 353     elif fn_arg.startswith("bool"):
 354         java_ty = "boolean"
 355         c_ty = "jboolean"
 356         fn_ty_arg = "Z"
 357         fn_arg = fn_arg[4:].strip()
 358         is_primitive = True
 359     elif fn_arg.startswith("uint8_t"):
 360         java_ty = "byte"
 361         c_ty = "jbyte"
 362         fn_ty_arg = "B"
 363         fn_arg = fn_arg[7:].strip()
 364         is_primitive = True
 365     elif fn_arg.startswith("uint16_t"):
 366         java_ty = "short"
 367         c_ty = "jshort"
 368         fn_ty_arg = "S"
 369         fn_arg = fn_arg[8:].strip()
 370         is_primitive = True
 371     elif fn_arg.startswith("uint32_t"):
 372         java_ty = "int"
 373         c_ty = "jint"
 374         fn_ty_arg = "I"
 375         fn_arg = fn_arg[8:].strip()
 376         is_primitive = True
 377     elif fn_arg.startswith("uint64_t") or fn_arg.startswith("uintptr_t"):
 378         java_ty = "long"
 379         c_ty = "jlong"
 380         fn_ty_arg = "J"
 381         if fn_arg.startswith("uint64_t"):
 382             fn_arg = fn_arg[8:].strip()
 383         else:
 384             fn_arg = fn_arg[9:].strip()
 385         is_primitive = True
 386     elif is_const and fn_arg.startswith("char *"):
 387         java_ty = "String"
 388         c_ty = "const char*"
 389         fn_ty_arg = "Ljava/lang/String;"
 390         fn_arg = fn_arg[6:].strip()
 391     elif fn_arg.startswith("LDKStr"):
 392         java_ty = "String"
 393         c_ty = "jstring"
 394         fn_ty_arg = "Ljava/lang/String;"
 395         fn_arg = fn_arg[6:].strip()
 396         arr_access = "chars"
 397         arr_len = "len"
 398     else:
 399         ma = var_ty_regex.match(fn_arg)
 400         if ma.group(1).strip() in unitary_enums:
 401             java_ty = ma.group(1).strip()
 402             c_ty = "jclass"
 403             fn_ty_arg = "Lorg/ldk/enums/" + ma.group(1).strip() + ";"
 404             fn_arg = ma.group(2).strip()
 405             rust_obj = ma.group(1).strip()
 406             take_by_ptr = True
 407         elif ma.group(1).strip().startswith("LDKC2Tuple"):
 408             java_ty = "long"
 409             java_hu_ty = "TwoTuple<"
 410             if not ma.group(1).strip() in tuple_types:
 411                 assert java_c_types_none_allowed
 412                 return None
 413             for idx, ty_info in enumerate(tuple_types[ma.group(1).strip()][0]):
 414                 if idx != 0:
 415                     java_hu_ty = java_hu_ty + ", "
 416                 if ty_info.is_native_primitive:
 417                     java_hu_ty = java_hu_ty + ty_info.java_hu_ty.title() # If we're a primitive, capitalize the first letter
 418                 else:
 419                     java_hu_ty = java_hu_ty + ty_info.java_hu_ty
 420             java_hu_ty = java_hu_ty + ">"
 421             c_ty = "jlong"
 422             fn_ty_arg = "J"
 423             fn_arg = ma.group(2).strip()
 424             rust_obj = ma.group(1).strip()
 425             take_by_ptr = True
 426         elif ma.group(1).strip().startswith("LDKC3Tuple"):
 427             java_ty = "long"
 428             java_hu_ty = "ThreeTuple<"
 429             if not ma.group(1).strip() in tuple_types:
 430                 assert java_c_types_none_allowed
 431                 return None
 432             for idx, ty_info in enumerate(tuple_types[ma.group(1).strip()][0]):
 433                 if idx != 0:
 434                     java_hu_ty = java_hu_ty + ", "
 435                 if ty_info.is_native_primitive:
 436                     java_hu_ty = java_hu_ty + ty_info.java_hu_ty.title() # If we're a primitive, capitalize the first letter
 437                 else:
 438                     java_hu_ty = java_hu_ty + ty_info.java_hu_ty
 439             java_hu_ty = java_hu_ty + ">"
 440             c_ty = "jlong"
 441             fn_ty_arg = "J"
 442             fn_arg = ma.group(2).strip()
 443             rust_obj = ma.group(1).strip()
 444             take_by_ptr = True
 445         else:
 446             java_ty = "long"
 447             java_hu_ty = ma.group(1).strip().replace("LDKCResult", "Result").replace("LDK", "")
 448             c_ty = "jlong"
 449             fn_ty_arg = "J"
 450             fn_arg = ma.group(2).strip()
 451             rust_obj = ma.group(1).strip()
 452             take_by_ptr = True
 453
 454     if fn_arg.startswith(" *") or fn_arg.startswith("*"):
 455         fn_arg = fn_arg.replace("*", "").strip()
 456         is_ptr = True
 457         c_ty = "jlong"
 458         java_ty = "long"
 459         fn_ty_arg = "J"
 460         is_primitive = False
 461
 462     var_is_arr = var_is_arr_regex.match(fn_arg)
 463     if var_is_arr is not None or ret_arr_len is not None:
 464         assert(not take_by_ptr)
 465         assert(not is_ptr)
 466         java_ty = java_ty + "[]"
 467         c_ty = c_ty + "Array"
 468         if var_is_arr is not None:
 469             if var_is_arr.group(1) == "":
 470                 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,
 471                     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)
 472             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,
 473                 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)
 474
 475     if java_hu_ty is None:
 476         java_hu_ty = java_ty
 477     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,
 478         is_ptr=is_ptr, var_name=fn_arg, arr_len=arr_len, arr_access=arr_access, is_native_primitive=is_primitive)
 479
 480 fn_ptr_regex = re.compile("^extern const ([A-Za-z_0-9\* ]*) \(\*(.*)\)\((.*)\);$")
 481 fn_ret_arr_regex = re.compile("(.*) \(\*(.*)\((.*)\)\)\[([0-9]*)\];$")
 482 reg_fn_regex = re.compile("([A-Za-z_0-9\* ]* \*?)([a-zA-Z_0-9]*)\((.*)\);$")
 483 clone_fns = set()
 484 constructor_fns = {}
 485 c_array_class_caches = set()
 486 with open(sys.argv[1]) as in_h:
 487     for line in in_h:
 488         reg_fn = reg_fn_regex.match(line)
 489         if reg_fn is not None:
 490             if reg_fn.group(2).endswith("_clone"):
 491                 clone_fns.add(reg_fn.group(2))
 492             else:
 493                 rty = java_c_types(reg_fn.group(1), None)
 494                 if rty is not None and rty.rust_obj is not None and reg_fn.group(2) == rty.java_hu_ty + "_new":
 495                     constructor_fns[rty.rust_obj] = reg_fn.group(3)
 496             continue
 497         arr_fn = fn_ret_arr_regex.match(line)
 498         if arr_fn is not None:
 499             if arr_fn.group(2).endswith("_clone"):
 500                 clone_fns.add(arr_fn.group(2))
 501             # No object constructors return arrays, as then they wouldn't be an object constructor
 502             continue
 503 java_c_types_none_allowed = False # C structs created by cbindgen are declared in dependency order
 504
 505 with open(sys.argv[1]) as in_h, open(sys.argv[2], "w") as out_java:
 506     def map_type(fn_arg, print_void, ret_arr_len, is_free, holds_ref):
 507         ty_info = java_c_types(fn_arg, ret_arr_len)
 508         return map_type_with_info(ty_info, print_void, ret_arr_len, is_free, holds_ref)
 509
 510     def map_type_with_info(ty_info, print_void, ret_arr_len, is_free, holds_ref):
 511         if ty_info.c_ty == "void":
 512             if not print_void:
 513                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 514                     arg_conv = None, arg_conv_name = None, arg_conv_cleanup = None,
 515                     ret_conv = None, ret_conv_name = None, to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 516         if ty_info.c_ty.endswith("Array"):
 517             arr_len = ty_info.arr_len
 518             if arr_len is not None:
 519                 arr_name = ty_info.var_name
 520             else:
 521                 arr_name = "ret"
 522                 arr_len = ret_arr_len
 523             if ty_info.c_ty == "jbyteArray":
 524                 ret_conv = ("jbyteArray " + arr_name + "_arr = (*_env)->NewByteArray(_env, " + arr_len + ");\n" + "(*_env)->SetByteArrayRegion(_env, " + arr_name + "_arr, 0, " + arr_len + ", ", "")
 525                 arg_conv_cleanup = None
 526                 if not arr_len.isdigit():
 527                     arg_conv = ty_info.rust_obj + " " + arr_name + "_ref;\n"
 528                     arg_conv = arg_conv + arr_name + "_ref." + arr_len + " = (*_env)->GetArrayLength (_env, " + arr_name + ");\n"
 529                     if (not ty_info.is_ptr or not holds_ref) and ty_info.rust_obj != "LDKu8slice":
 530                         arg_conv = arg_conv + arr_name + "_ref." + ty_info.arr_access + " = MALLOC(" + arr_name + "_ref." + arr_len + ", \"" + ty_info.rust_obj + " Bytes\");\n"
 531                         arg_conv = arg_conv + "(*_env)->GetByteArrayRegion(_env, " + arr_name + ", 0, " + arr_name + "_ref." + arr_len + ", " + arr_name + "_ref." + ty_info.arr_access + ");"
 532                     else:
 533                         arg_conv = arg_conv + arr_name + "_ref." + ty_info.arr_access + " = (*_env)->GetByteArrayElements (_env, " + arr_name + ", NULL);"
 534                         arg_conv_cleanup = "(*_env)->ReleaseByteArrayElements(_env, " + arr_name + ", (int8_t*)" + arr_name + "_ref." + ty_info.arr_access + ", 0);"
 535                     if ty_info.rust_obj == "LDKTransaction":
 536                         arg_conv = arg_conv + "\n" + arr_name + "_ref.data_is_owned = " + str(holds_ref).lower() + ";"
 537                     ret_conv = (ty_info.rust_obj + " " + arr_name + "_var = ", "")
 538                     ret_conv = (ret_conv[0], ";\njbyteArray " + arr_name + "_arr = (*_env)->NewByteArray(_env, " + arr_name + "_var." + arr_len + ");\n")
 539                     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 + ");")
 540                     if not holds_ref and ty_info.rust_obj != "LDKu8slice":
 541                         ret_conv = (ret_conv[0], ret_conv[1] + "\n" + ty_info.rust_obj.replace("LDK", "") + "_free(" + arr_name + "_var);")
 542                 elif ty_info.rust_obj is not None:
 543                     arg_conv = ty_info.rust_obj + " " + arr_name + "_ref;\n"
 544                     arg_conv = arg_conv + "CHECK((*_env)->GetArrayLength (_env, " + arr_name + ") == " + arr_len + ");\n"
 545                     arg_conv = arg_conv + "(*_env)->GetByteArrayRegion (_env, " + arr_name + ", 0, " + arr_len + ", " + arr_name + "_ref." + ty_info.arr_access + ");"
 546                     ret_conv = (ret_conv[0], "." + ty_info.arr_access + ");")
 547                 else:
 548                     arg_conv = "unsigned char " + arr_name + "_arr[" + arr_len + "];\n"
 549                     arg_conv = arg_conv + "CHECK((*_env)->GetArrayLength (_env, " + arr_name + ") == " + arr_len + ");\n"
 550                     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;"
 551                     ret_conv = (ret_conv[0] + "*", ");")
 552                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 553                     arg_conv = arg_conv, arg_conv_name = arr_name + "_ref", arg_conv_cleanup = arg_conv_cleanup,
 554                     ret_conv = ret_conv, ret_conv_name = arr_name + "_arr", to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 555             else:
 556                 assert not arr_len.isdigit() # fixed length arrays not implemented
 557                 assert ty_info.java_ty[len(ty_info.java_ty) - 2:] == "[]"
 558                 conv_name = "arr_conv_" + str(len(ty_info.java_hu_ty))
 559                 idxc = chr(ord('a') + (len(ty_info.java_hu_ty) % 26))
 560                 ty_info.subty.var_name = conv_name
 561                 ty_info.subty.requires_clone = not ty_info.is_ptr or not holds_ref
 562                 subty = map_type_with_info(ty_info.subty, False, None, is_free, holds_ref)
 563                 if arr_name == "":
 564                     arr_name = "arg"
 565                 arg_conv = ty_info.rust_obj + " " + arr_name + "_constr;\n"
 566                 arg_conv = arg_conv + arr_name + "_constr." + arr_len + " = (*_env)->GetArrayLength (_env, " + arr_name + ");\n"
 567                 arg_conv = arg_conv + "if (" + arr_name + "_constr." + arr_len + " > 0)\n"
 568                 if subty.rust_obj is None:
 569                     szof = subty.c_ty
 570                 else:
 571                     szof = subty.rust_obj
 572                 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"
 573                 arg_conv = arg_conv + "else\n"
 574                 arg_conv = arg_conv + "\t" + arr_name + "_constr." + ty_info.arr_access + " = NULL;\n"
 575                 if not ty_info.java_ty[:len(ty_info.java_ty) - 2].endswith("[]"):
 576                     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"
 577                 arg_conv = arg_conv + "for (size_t " + idxc + " = 0; " + idxc + " < " + arr_name + "_constr." + arr_len + "; " + idxc + "++) {\n"
 578                 if not ty_info.java_ty[:len(ty_info.java_ty) - 2].endswith("[]"):
 579                     arg_conv = arg_conv + "\t" + ty_info.java_ty.strip("[]") + " " + conv_name + " = " + arr_name + "_vals[" + idxc + "];"
 580                     if subty.arg_conv is not None:
 581                         arg_conv = arg_conv + "\n\t" + subty.arg_conv.replace("\n", "\n\t")
 582                 else:
 583                     arg_conv = arg_conv + "\tjobject " + conv_name + " = (*_env)->GetObjectArrayElement(_env, " + arr_name + ", " + idxc + ");\n"
 584                     arg_conv = arg_conv + "\t" + subty.arg_conv.replace("\n", "\n\t")
 585                 arg_conv = arg_conv + "\n\t" + arr_name + "_constr." + ty_info.arr_access + "[" + idxc + "] = " + subty.arg_conv_name + ";\n}"
 586                 if not ty_info.java_ty[:len(ty_info.java_ty) - 2].endswith("[]"):
 587                     arg_conv = arg_conv + "\n(*_env)->Release" + ty_info.java_ty.strip("[]").title() + "ArrayElements (_env, " + arr_name + ", " + arr_name + "_vals, 0);"
 588                 if ty_info.is_ptr:
 589                     arg_conv_name = "&" + arr_name + "_constr"
 590                 else:
 591                     arg_conv_name = arr_name + "_constr"
 592                 arg_conv_cleanup = None
 593                 if ty_info.is_ptr:
 594                     arg_conv_cleanup = "FREE(" + arr_name + "_constr." + ty_info.arr_access + ");"
 595
 596                 if arr_name == "arg":
 597                     arr_name = "ret"
 598                 ret_conv = (ty_info.rust_obj + " " + arr_name + "_var = ", "")
 599                 if subty.ret_conv is None:
 600                     ret_conv = ("DUMMY", "DUMMY")
 601                 elif not ty_info.java_ty[:len(ty_info.java_ty) - 2].endswith("[]"):
 602                     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")
 603                     ret_conv = (ret_conv[0], ret_conv[1] + subty.c_ty + " *" + arr_name + "_arr_ptr = (*_env)->GetPrimitiveArrayCritical(_env, " + arr_name + "_arr, NULL);\n")
 604                     ret_conv = (ret_conv[0], ret_conv[1] + "for (size_t " + idxc + " = 0; " + idxc + " < " + arr_name + "_var." + arr_len + "; " + idxc + "++) {\n")
 605                     ret_conv = (ret_conv[0], ret_conv[1] + "\t" + subty.ret_conv[0].replace("\n", "\n\t"))
 606                     ret_conv = (ret_conv[0], ret_conv[1] + arr_name + "_var." + ty_info.arr_access + "[" + idxc + "]" + subty.ret_conv[1].replace("\n", "\n\t"))
 607                     ret_conv = (ret_conv[0], ret_conv[1] + "\n\t" + arr_name + "_arr_ptr[" + idxc + "] = " + subty.ret_conv_name + ";\n")
 608                     ret_conv = (ret_conv[0], ret_conv[1] + "}\n(*_env)->ReleasePrimitiveArrayCritical(_env, " + arr_name + "_arr, " + arr_name + "_arr_ptr, 0);")
 609                 else:
 610                     assert ty_info.java_fn_ty_arg.startswith("[")
 611                     clz_var = ty_info.java_fn_ty_arg[1:].replace("[", "arr_of_")
 612                     c_array_class_caches.add(clz_var)
 613                     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")
 614                     ret_conv = (ret_conv[0], ret_conv[1] + "for (size_t " + idxc + " = 0; " + idxc + " < " + arr_name + "_var." + arr_len + "; " + idxc + "++) {\n")
 615                     ret_conv = (ret_conv[0], ret_conv[1] + "\t" + subty.ret_conv[0].replace("\n", "\n\t"))
 616                     ret_conv = (ret_conv[0], ret_conv[1] + arr_name + "_var." + ty_info.arr_access + "[" + idxc + "]" + subty.ret_conv[1].replace("\n", "\n\t"))
 617                     ret_conv = (ret_conv[0], ret_conv[1] + "\n\t(*_env)->SetObjectArrayElement(_env, " + arr_name + "_arr, " + idxc + ", " + subty.ret_conv_name + ");\n")
 618                     ret_conv = (ret_conv[0], ret_conv[1] + "}")
 619                 if not holds_ref:
 620                     if subty.rust_obj is not None and subty.rust_obj in opaque_structs:
 621                         ret_conv = (ret_conv[0], ret_conv[1] + "\nFREE(" + arr_name + "_var." + ty_info.arr_access + ");")
 622                     else:
 623                         ret_conv = (ret_conv[0], ret_conv[1] + "\n" + ty_info.rust_obj.replace("LDK", "") + "_free(" + arr_name + "_var);")
 624
 625                 to_hu_conv = None
 626                 to_hu_conv_name = None
 627                 if subty.to_hu_conv is not None:
 628                     to_hu_conv = ty_info.java_hu_ty + " " + conv_name + "_arr = new " + ty_info.subty.java_hu_ty.split("<")[0] + "[" + arr_name + ".length];\n"
 629                     to_hu_conv = to_hu_conv + "for (int " + idxc + " = 0; " + idxc + " < " + arr_name + ".length; " + idxc + "++) {\n"
 630                     to_hu_conv = to_hu_conv + "\t" + subty.java_ty + " " + conv_name + " = " + arr_name + "[" + idxc + "];\n"
 631                     to_hu_conv = to_hu_conv + "\t" + subty.to_hu_conv.replace("\n", "\n\t") + "\n"
 632                     to_hu_conv = to_hu_conv + "\t" + conv_name + "_arr[" + idxc + "] = " + subty.to_hu_conv_name + ";\n}"
 633                     to_hu_conv_name = conv_name + "_arr"
 634                 from_hu_conv = None
 635                 if subty.from_hu_conv is not None:
 636                     if subty.java_ty == "long" and subty.java_hu_ty != "long":
 637                         from_hu_conv = ("Arrays.stream(" + arr_name + ").mapToLong(" + conv_name + " -> " + subty.from_hu_conv[0] + ").toArray()", "/* TODO 2 " + subty.java_hu_ty + "  */")
 638                     elif subty.java_ty == "long":
 639                         from_hu_conv = ("Arrays.stream(" + arr_name + ").map(" + conv_name + " -> " + subty.from_hu_conv[0] + ").toArray()", "/* TODO 2 " + subty.java_hu_ty + "  */")
 640                     else:
 641                         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 + "  */")
 642
 643                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 644                     arg_conv = arg_conv, arg_conv_name = arg_conv_name, arg_conv_cleanup = arg_conv_cleanup,
 645                     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)
 646         elif ty_info.java_ty == "String":
 647             if ty_info.arr_access is None:
 648                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 649                     arg_conv = None, arg_conv_name = None, arg_conv_cleanup = None,
 650                     ret_conv = ("jstring " + ty_info.var_name + "_conv = (*_env)->NewStringUTF(_env, ", ");"), ret_conv_name = ty_info.var_name + "_conv",
 651                     to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 652             else:
 653                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 654                     arg_conv = None, arg_conv_name = None, arg_conv_cleanup = None,
 655                     ret_conv = ("LDKStr " + ty_info.var_name + "_str = ",
 656                         ";\nchar* " + ty_info.var_name + "_buf = MALLOC(" + ty_info.var_name + "_str." + ty_info.arr_len + " + 1, \"str conv buf\");\n" +
 657                         "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" +
 658                         ty_info.var_name + "_buf[" + ty_info.var_name + "_str." + ty_info.arr_len + "] = 0;\n" +
 659                         "jstring " + ty_info.var_name + "_conv = (*_env)->NewStringUTF(_env, " + ty_info.var_name + "_str." + ty_info.arr_access + ");\n" +
 660                         "FREE(" + ty_info.var_name + "_buf);"),
 661                     ret_conv_name = ty_info.var_name + "_conv", to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 662         elif ty_info.var_name == "" and not print_void:
 663             # We don't have a parameter name, and want one, just call it arg
 664             if ty_info.rust_obj is not None:
 665                 assert(not is_free or ty_info.rust_obj not in opaque_structs)
 666                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 667                     arg_conv = ty_info.rust_obj + " arg_conv = *(" + ty_info.rust_obj + "*)arg;\nFREE((void*)arg);",
 668                     arg_conv_name = "arg_conv", arg_conv_cleanup = None,
 669                     ret_conv = None, ret_conv_name = None, to_hu_conv = "TODO 7", to_hu_conv_name = None, from_hu_conv = None)
 670             else:
 671                 assert(not is_free)
 672                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 673                     arg_conv = None, arg_conv_name = "arg", arg_conv_cleanup = None,
 674                     ret_conv = None, ret_conv_name = None, to_hu_conv = "TODO 8", to_hu_conv_name = None, from_hu_conv = None)
 675         elif ty_info.rust_obj is None:
 676             return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 677                 arg_conv = None, arg_conv_name = ty_info.var_name, arg_conv_cleanup = None,
 678                 ret_conv = None, ret_conv_name = None, to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 679         else:
 680             if ty_info.var_name == "":
 681                 ty_info.var_name = "ret"
 682
 683             if ty_info.rust_obj in opaque_structs:
 684                 opaque_arg_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv;\n"
 685                 opaque_arg_conv = opaque_arg_conv + ty_info.var_name + "_conv.inner = (void*)(" + ty_info.var_name + " & (~1));\n"
 686                 if ty_info.is_ptr and holds_ref:
 687                     opaque_arg_conv = opaque_arg_conv + ty_info.var_name + "_conv.is_owned = false;"
 688                 else:
 689                     opaque_arg_conv = opaque_arg_conv + ty_info.var_name + "_conv.is_owned = (" + ty_info.var_name + " & 1) || (" + ty_info.var_name + " == 0);"
 690                 if not is_free and (not ty_info.is_ptr or not holds_ref or ty_info.requires_clone == True) and ty_info.requires_clone != False:
 691                     if (ty_info.java_hu_ty + "_clone") in clone_fns:
 692                         # 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.
 693                         opaque_arg_conv = opaque_arg_conv + "\nif (" + ty_info.var_name + "_conv.inner != NULL)\n"
 694                         opaque_arg_conv = opaque_arg_conv + "\t" + ty_info.var_name + "_conv = " + ty_info.java_hu_ty + "_clone(&" + ty_info.var_name + "_conv);"
 695                     elif ty_info.passed_as_ptr:
 696                         opaque_arg_conv = opaque_arg_conv + "\n// Warning: we may need a move here but can't clone!"
 697
 698                 opaque_ret_conv_suf = ";\n"
 699                 if not holds_ref and ty_info.is_ptr and (ty_info.java_hu_ty + "_clone") in clone_fns: # is_ptr, not holds_ref implies passing a pointed-to value to java, which needs copied
 700                     opaque_ret_conv_suf = opaque_ret_conv_suf + "if (" + ty_info.var_name + "->inner != NULL)\n"
 701                     opaque_ret_conv_suf = opaque_ret_conv_suf + "\t" + ty_info.var_name + "_var = " + ty_info.java_hu_ty + "_clone(" + ty_info.var_name + ");\n"
 702                 elif not holds_ref and ty_info.is_ptr:
 703                     opaque_ret_conv_suf = opaque_ret_conv_suf + "// Warning: we may need a move here but can't clone!\n"
 704
 705                 opaque_ret_conv_suf = opaque_ret_conv_suf + "CHECK((((long)" + ty_info.var_name + "_var.inner) & 1) == 0); // We rely on a free low bit, malloc guarantees this.\n"
 706                 opaque_ret_conv_suf = opaque_ret_conv_suf + "CHECK((((long)&" + ty_info.var_name + "_var) & 1) == 0); // We rely on a free low bit, pointer alignment guarantees this.\n"
 707                 if holds_ref or ty_info.is_ptr:
 708                     opaque_ret_conv_suf = opaque_ret_conv_suf + "long " + ty_info.var_name + "_ref = (long)" + ty_info.var_name + "_var.inner & ~1;"
 709                 else:
 710                     opaque_ret_conv_suf = opaque_ret_conv_suf + "long " + ty_info.var_name + "_ref = (long)" + ty_info.var_name + "_var.inner;\n"
 711                     opaque_ret_conv_suf = opaque_ret_conv_suf + "if (" + ty_info.var_name + "_var.is_owned) {\n"
 712                     opaque_ret_conv_suf = opaque_ret_conv_suf + "\t" + ty_info.var_name + "_ref |= 1;\n"
 713                     opaque_ret_conv_suf = opaque_ret_conv_suf + "}"
 714
 715                 if ty_info.is_ptr:
 716                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 717                         arg_conv = opaque_arg_conv, arg_conv_name = "&" + ty_info.var_name + "_conv", arg_conv_cleanup = None,
 718                         ret_conv = (ty_info.rust_obj + " " + ty_info.var_name + "_var = *", opaque_ret_conv_suf),
 719                         ret_conv_name = ty_info.var_name + "_ref",
 720                         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 + ");",
 721                         to_hu_conv_name = ty_info.var_name + "_hu_conv",
 722                         from_hu_conv = (ty_info.var_name + " == null ? 0 : " + ty_info.var_name + ".ptr & ~1", "this.ptrs_to.add(" + ty_info.var_name + ")"))
 723                 else:
 724                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 725                         arg_conv = opaque_arg_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 726                         ret_conv = (ty_info.rust_obj + " " + ty_info.var_name + "_var = ", opaque_ret_conv_suf),
 727                         ret_conv_name = ty_info.var_name + "_ref",
 728                         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 + ");",
 729                         to_hu_conv_name = ty_info.var_name + "_hu_conv",
 730                         from_hu_conv = (ty_info.var_name + " == null ? 0 : " + ty_info.var_name + ".ptr & ~1", "this.ptrs_to.add(" + ty_info.var_name + ")"))
 731
 732             if not ty_info.is_ptr:
 733                 if ty_info.rust_obj in unitary_enums:
 734                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 735                         arg_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv = " + ty_info.rust_obj + "_from_java(_env, " + ty_info.var_name + ");",
 736                         arg_conv_name = ty_info.var_name + "_conv",
 737                         arg_conv_cleanup = None,
 738                         ret_conv = ("jclass " + ty_info.var_name + "_conv = " + ty_info.rust_obj + "_to_java(_env, ", ");"),
 739                         ret_conv_name = ty_info.var_name + "_conv", to_hu_conv = None, to_hu_conv_name = None, from_hu_conv = None)
 740                 base_conv = ty_info.rust_obj + " " + ty_info.var_name + "_conv = *(" + ty_info.rust_obj + "*)" + ty_info.var_name + ";";
 741                 if ty_info.rust_obj in trait_structs:
 742                     if not is_free:
 743                         base_conv = base_conv + "\nif (" + ty_info.var_name + "_conv.free == " + ty_info.rust_obj + "_JCalls_free) {\n"
 744                         base_conv = base_conv + "\t// If this_arg is a JCalls struct, then we need to increment the refcnt in it.\n"
 745                         base_conv = base_conv + "\t" + ty_info.rust_obj + "_JCalls_clone(" + ty_info.var_name + "_conv.this_arg);\n}"
 746                     else:
 747                         base_conv = base_conv + "\n" + "FREE((void*)" + ty_info.var_name + ");"
 748                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 749                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 750                         ret_conv = (ty_info.rust_obj + "* ret = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n*ret = ", ";"),
 751                         ret_conv_name = "(long)ret",
 752                         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);",
 753                         to_hu_conv_name = "ret_hu_conv",
 754                         from_hu_conv = (ty_info.var_name + " == null ? 0 : " + ty_info.var_name + ".ptr", "this.ptrs_to.add(" + ty_info.var_name + ")"))
 755                 if ty_info.rust_obj != "LDKu8slice":
 756                     # Don't bother free'ing slices passed in - Rust doesn't auto-free the
 757                     # underlying unlike Vecs, and it gives Java more freedom.
 758                     base_conv = base_conv + "\nFREE((void*)" + ty_info.var_name + ");";
 759                 if ty_info.rust_obj in complex_enums:
 760                     ret_conv = ("long " + ty_info.var_name + "_ref = (long)&", ";")
 761                     if not holds_ref:
 762                         ret_conv = (ty_info.rust_obj + " *" + ty_info.var_name + "_copy = MALLOC(sizeof(" + ty_info.rust_obj + "), \"" + ty_info.rust_obj + "\");\n", "")
 763                         if ty_info.requires_clone == True: # Set in object array mapping
 764                             if (ty_info.java_hu_ty + "_clone") in clone_fns:
 765                                 ret_conv = (ret_conv[0] + "*" + ty_info.var_name + "_copy = " + ty_info.java_hu_ty + "_clone(&", ");\n")
 766                             else:
 767                                 ret_conv = (ret_conv[0] + "*" + ty_info.var_name + "_copy = ", "; // XXX: We likely need to clone here, but no _clone fn is available!\n")
 768                         else:
 769                             ret_conv = (ret_conv[0] + "*" + ty_info.var_name + "_copy = ", ";\n")
 770                         ret_conv = (ret_conv[0], ret_conv[1] + "long " + ty_info.var_name + "_ref = (long)" + ty_info.var_name + "_copy;")
 771                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 772                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 773                         ret_conv = ret_conv, ret_conv_name = ty_info.var_name + "_ref",
 774                         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);",
 775                         to_hu_conv_name = ty_info.var_name + "_hu_conv", from_hu_conv = (ty_info.var_name + ".ptr", ""))
 776                 if ty_info.rust_obj in result_types:
 777                     assert not ty_info.is_ptr and not holds_ref # Otherwise we shouldn't be MALLOC'ing
 778                     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 = ", ";")
 779                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 780                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 781                         ret_conv = ret_conv, ret_conv_name = "(long)" + ty_info.var_name + "_conv",
 782                         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);",
 783                         to_hu_conv_name = ty_info.var_name + "_hu_conv", from_hu_conv = (ty_info.var_name + " != null ? " + ty_info.var_name + ".ptr : 0", ""))
 784                 if ty_info.rust_obj in tuple_types:
 785                     from_hu_conv = "bindings." + tuple_types[ty_info.rust_obj][1].replace("LDK", "") + "_new("
 786                     to_hu_conv_pfx = ""
 787                     to_hu_conv_sfx = ty_info.java_hu_ty + " " + ty_info.var_name + "_conv = new " + ty_info.java_hu_ty + "("
 788                     for idx, conv in enumerate(tuple_types[ty_info.rust_obj][0]):
 789                         if idx != 0:
 790                             to_hu_conv_sfx = to_hu_conv_sfx + ", "
 791                             from_hu_conv = from_hu_conv + ", "
 792                         conv.var_name = ty_info.var_name + "_" + chr(idx + ord("a"))
 793                         conv_map = map_type_with_info(conv, False, None, is_free, holds_ref)
 794                         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"
 795                         if conv_map.to_hu_conv is not None:
 796                             to_hu_conv_pfx = to_hu_conv_pfx + conv_map.to_hu_conv + ";\n"
 797                             to_hu_conv_sfx = to_hu_conv_sfx + conv_map.to_hu_conv_name
 798                         else:
 799                             to_hu_conv_sfx = to_hu_conv_sfx + ty_info.var_name + "_" + chr(idx + ord("a"))
 800                         if conv_map.from_hu_conv is not None:
 801                             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")))
 802                             if conv_map.from_hu_conv[1] != "":
 803                                 from_hu_conv = from_hu_conv + "/*XXX: " + conv_map.from_hu_conv[1] + "*/"
 804                         else:
 805                             from_hu_conv = from_hu_conv + ty_info.var_name + "." + chr(idx + ord("a"))
 806
 807                     if not ty_info.is_ptr and not holds_ref:
 808                         return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 809                             arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 810
 811                             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 = ", ";"),
 812                             ret_conv_name = "(long)" + ty_info.var_name + "_ref",
 813                             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 + ")", ""))
 814                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 815                         arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 816                         ret_conv = ("long " + ty_info.var_name + "_ref = (long)&", ";"), ret_conv_name = ty_info.var_name + "_ref",
 817                         to_hu_conv = to_hu_conv_pfx + to_hu_conv_sfx + ");", to_hu_conv_name = ty_info.var_name + "_conv", from_hu_conv = (from_hu_conv + ")", ""))
 818
 819                 # The manually-defined types - TxOut and Transaction
 820                 assert ty_info.rust_obj == "LDKTxOut"
 821                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 822                     arg_conv = base_conv, arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 823                     ret_conv = ("long " + ty_info.var_name + "_ref = (long)&", ";"), ret_conv_name = ty_info.var_name + "_ref",
 824                     to_hu_conv = ty_info.java_hu_ty + " " + ty_info.var_name + "_conv = new " +ty_info.java_hu_ty + "(null, " + ty_info.var_name + ");",
 825                     to_hu_conv_name = ty_info.var_name + "_conv", from_hu_conv = (ty_info.var_name + ".ptr", ""))
 826             elif ty_info.is_ptr:
 827                 assert(not is_free)
 828                 if ty_info.rust_obj in complex_enums:
 829                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 830                         arg_conv = ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)" + ty_info.var_name + ";",
 831                         arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 832                         ret_conv = ("long ret_" + ty_info.var_name + " = (long)", ";"), ret_conv_name = "ret_" + ty_info.var_name,
 833                         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 + ");",
 834                         to_hu_conv_name = ty_info.var_name + "_hu_conv",
 835                         from_hu_conv = (ty_info.var_name + " == null ? 0 : " + ty_info.var_name + ".ptr & ~1", "this.ptrs_to.add(" + ty_info.var_name + ")"))
 836                 elif ty_info.rust_obj in trait_structs:
 837                     return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 838                         arg_conv = ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)" + ty_info.var_name + ";",
 839                         arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 840                         ret_conv = ("long ret_" + ty_info.var_name + " = (long)", ";"), ret_conv_name = "ret_" + ty_info.var_name,
 841                         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);",
 842                         to_hu_conv_name = "ret_hu_conv",
 843                         from_hu_conv = (ty_info.var_name + " == null ? 0 : " + ty_info.var_name + ".ptr", "this.ptrs_to.add(" + ty_info.var_name + ")"))
 844                 return ConvInfo(ty_info = ty_info, arg_name = ty_info.var_name,
 845                     arg_conv = ty_info.rust_obj + "* " + ty_info.var_name + "_conv = (" + ty_info.rust_obj + "*)" + ty_info.var_name + ";",
 846                     arg_conv_name = ty_info.var_name + "_conv", arg_conv_cleanup = None,
 847                     ret_conv = ("long ret_" + ty_info.var_name + " = (long)", ";"), ret_conv_name = "ret_" + ty_info.var_name,
 848                     to_hu_conv = "TODO 3", to_hu_conv_name = None, from_hu_conv = None) # its a pointer, no conv needed
 849             assert False # We should have handled every case by now.
 850
 851     def map_fn(line, re_match, ret_arr_len, c_call_string):
 852         out_java.write("\t// " + line)
 853         out_java.write("\tpublic static native ")
 854         write_c("JNIEXPORT ")
 855
 856         is_free = re_match.group(2).endswith("_free")
 857         struct_meth = re_match.group(2).split("_")[0]
 858
 859         ret_info = map_type(re_match.group(1), True, ret_arr_len, False, False)
 860         ret_info.print_ty()
 861
 862         if ret_info.ret_conv is not None:
 863             ret_conv_pfx, ret_conv_sfx = ret_info.ret_conv
 864
 865         out_java.write(" " + re_match.group(2) + "(")
 866         write_c(" JNICALL Java_org_ldk_impl_bindings_" + re_match.group(2).replace('_', '_1') + "(JNIEnv * _env, jclass _b")
 867
 868         arg_names = []
 869         default_constructor_args = {}
 870         takes_self = False
 871         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
 872         for idx, arg in enumerate(re_match.group(3).split(',')):
 873             if idx != 0:
 874                 out_java.write(", ")
 875             if arg != "void":
 876                 write_c(", ")
 877             arg_conv_info = map_type(arg, False, None, is_free, True)
 878             if arg_conv_info.c_ty != "void":
 879                 arg_conv_info.print_ty()
 880                 arg_conv_info.print_name()
 881             if arg_conv_info.arg_name == "this_ptr" or arg_conv_info.arg_name == "this_arg":
 882                 takes_self = True
 883             if arg_conv_info.arg_conv is not None and "Warning" in arg_conv_info.arg_conv:
 884                 if arg_conv_info.rust_obj in constructor_fns:
 885                     assert not is_free
 886                     for explode_arg in constructor_fns[arg_conv_info.rust_obj].split(','):
 887                         explode_arg_conv = map_type(explode_arg, False, None, False, True)
 888                         if explode_arg_conv.c_ty == "void":
 889                             # We actually want to handle this case, but for now its only used in NetGraphMsgHandler::new()
 890                             # which ends up resulting in a redundant constructor - both without arguments for the NetworkGraph.
 891                             args_known = False
 892                         assert explode_arg_conv.arg_name != "this_ptr"
 893                         assert explode_arg_conv.arg_name != "this_arg"
 894                         if explode_arg_conv.passed_as_ptr and not explode_arg_conv.rust_obj in trait_structs:
 895                             args_known = False
 896                         if not arg_conv_info.arg_name in default_constructor_args:
 897                             default_constructor_args[arg_conv_info.arg_name] = []
 898                         default_constructor_args[arg_conv_info.arg_name].append(explode_arg_conv)
 899                 else:
 900                     args_known = False
 901             arg_names.append(arg_conv_info)
 902
 903         out_java_struct = None
 904         if ("LDK" + struct_meth in opaque_structs or "LDK" + struct_meth in trait_structs) and not is_free:
 905             out_java_struct = open(sys.argv[3] + "/structs/" + struct_meth + ".java", "a")
 906             if not args_known:
 907                 out_java_struct.write("\t// Skipped " + re_match.group(2) + "\n")
 908                 out_java_struct.close()
 909                 out_java_struct = None
 910             else:
 911                 meth_n = re_match.group(2)[len(struct_meth) + 1:]
 912                 if ret_info.rust_obj == "LDK" + struct_meth:
 913                     out_java_struct.write("\tpublic static " + ret_info.java_hu_ty + " constructor_" + meth_n + "(")
 914                 else:
 915                     out_java_struct.write("\tpublic " + ret_info.java_hu_ty + " " + meth_n + "(")
 916                 for idx, arg in enumerate(arg_names):
 917                     if idx != 0:
 918                         if not takes_self or idx > 1:
 919                             out_java_struct.write(", ")
 920                     if arg.java_ty != "void" and arg.arg_name != "this_ptr" and arg.arg_name != "this_arg":
 921                         if arg.arg_name in default_constructor_args:
 922                             for explode_idx, explode_arg in enumerate(default_constructor_args[arg.arg_name]):
 923                                 if explode_idx != 0:
 924                                     out_java_struct.write(", ")
 925                                 assert explode_arg.rust_obj in opaque_structs or explode_arg.rust_obj in trait_structs
 926                                 out_java_struct.write(explode_arg.java_hu_ty + " " + arg.arg_name + "_" + explode_arg.arg_name)
 927                         else:
 928                             out_java_struct.write(arg.java_hu_ty + " " + arg.arg_name)
 929
 930
 931         out_java.write(");\n")
 932         write_c(") {\n")
 933         if out_java_struct is not None:
 934             out_java_struct.write(") {\n")
 935
 936         for info in arg_names:
 937             if info.arg_conv is not None:
 938                 write_c("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
 939
 940         if ret_info.ret_conv is not None:
 941             write_c("\t" + ret_conv_pfx.replace('\n', '\n\t'))
 942         elif ret_info.c_ty != "void":
 943             write_c("\t" + ret_info.c_ty + " ret_val = ")
 944         else:
 945             write_c("\t")
 946
 947         if c_call_string is None:
 948             write_c(re_match.group(2) + "(")
 949         else:
 950             write_c(c_call_string)
 951         for idx, info in enumerate(arg_names):
 952             if info.arg_conv_name is not None:
 953                 if idx != 0:
 954                     write_c(", ")
 955                 elif c_call_string is not None:
 956                     continue
 957                 write_c(info.arg_conv_name)
 958         write_c(")")
 959         if ret_info.ret_conv is not None:
 960             write_c(ret_conv_sfx.replace('\n', '\n\t'))
 961         else:
 962             write_c(";")
 963         for info in arg_names:
 964             if info.arg_conv_cleanup is not None:
 965                 write_c("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
 966         if ret_info.ret_conv is not None:
 967             write_c("\n\treturn " + ret_info.ret_conv_name + ";")
 968         elif ret_info.c_ty != "void":
 969             write_c("\n\treturn ret_val;")
 970         write_c("\n}\n\n")
 971         if out_java_struct is not None:
 972             out_java_struct.write("\t\t")
 973             if ret_info.java_ty != "void":
 974                 out_java_struct.write(ret_info.java_ty + " ret = ")
 975             out_java_struct.write("bindings." + re_match.group(2) + "(")
 976             for idx, info in enumerate(arg_names):
 977                 if idx != 0:
 978                     out_java_struct.write(", ")
 979                 if info.arg_name == "this_ptr" or info.arg_name == "this_arg":
 980                     out_java_struct.write("this.ptr")
 981                 elif info.arg_name in default_constructor_args:
 982                     out_java_struct.write("bindings." + info.java_hu_ty + "_new(")
 983                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
 984                         if explode_idx != 0:
 985                             out_java_struct.write(", ")
 986                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
 987                         out_java_struct.write(explode_arg.from_hu_conv[0].replace(explode_arg.arg_name, expl_arg_name))
 988                     out_java_struct.write(")")
 989                 elif info.from_hu_conv is not None:
 990                     out_java_struct.write(info.from_hu_conv[0])
 991                 else:
 992                     out_java_struct.write(info.arg_name)
 993             out_java_struct.write(");\n")
 994             if ret_info.to_hu_conv is not None:
 995                 out_java_struct.write("\t\t" + ret_info.to_hu_conv.replace("\n", "\n\t\t") + "\n")
 996
 997             for info in arg_names:
 998                 if info.arg_name == "this_ptr" or info.arg_name == "this_arg":
 999                     pass
1000                 elif info.arg_name in default_constructor_args:
1001                     for explode_arg in default_constructor_args[info.arg_name]:
1002                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1003                         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")
1004                 elif info.from_hu_conv is not None and info.from_hu_conv[1] != "":
1005                     if ret_info.rust_obj == "LDK" + struct_meth and ret_info.to_hu_conv_name is not None:
1006                         out_java_struct.write("\t\t" + info.from_hu_conv[1].replace("this", ret_info.to_hu_conv_name) + ";\n")
1007                     else:
1008                         out_java_struct.write("\t\t" + info.from_hu_conv[1] + ";\n")
1009
1010             if ret_info.to_hu_conv_name is not None:
1011                 out_java_struct.write("\t\treturn " + ret_info.to_hu_conv_name + ";\n")
1012             elif ret_info.java_ty != "void" and ret_info.rust_obj != "LDK" + struct_meth:
1013                 out_java_struct.write("\t\treturn ret;\n")
1014             out_java_struct.write("\t}\n\n")
1015             out_java_struct.close()
1016
1017     def map_unitary_enum(struct_name, field_lines):
1018         with open(sys.argv[3] + "/enums/" + struct_name + ".java", "w") as out_java_enum:
1019             out_java_enum.write("package org.ldk.enums;\n\n")
1020             unitary_enums.add(struct_name)
1021             write_c("static inline " + struct_name + " " + struct_name + "_from_java(JNIEnv *env, jclass val) {\n")
1022             write_c("\tswitch ((*env)->CallIntMethod(env, val, ordinal_meth)) {\n")
1023             ord_v = 0
1024             for idx, struct_line in enumerate(field_lines):
1025                 if idx == 0:
1026                     out_java_enum.write("public enum " + struct_name + " {\n")
1027                 elif idx == len(field_lines) - 3:
1028                     assert(struct_line.endswith("_Sentinel,"))
1029                 elif idx == len(field_lines) - 2:
1030                     out_java_enum.write("\t; static native void init();\n")
1031                     out_java_enum.write("\tstatic { init(); }\n")
1032                     out_java_enum.write("}")
1033                     out_java.write("\tstatic { " + struct_name + ".values(); /* Force enum statics to run */ }\n")
1034                 elif idx == len(field_lines) - 1:
1035                     assert(struct_line == "")
1036                 else:
1037                     out_java_enum.write(struct_line + "\n")
1038                     write_c("\t\tcase %d: return %s;\n" % (ord_v, struct_line.strip().strip(",")))
1039                     ord_v = ord_v + 1
1040             write_c("\t}\n")
1041             write_c("\tabort();\n")
1042             write_c("}\n")
1043
1044             ord_v = 0
1045             write_c("static jclass " + struct_name + "_class = NULL;\n")
1046             for idx, struct_line in enumerate(field_lines):
1047                 if idx > 0 and idx < len(field_lines) - 3:
1048                     variant = struct_line.strip().strip(",")
1049                     write_c("static jfieldID " + struct_name + "_" + variant + " = NULL;\n")
1050             write_c("JNIEXPORT void JNICALL Java_org_ldk_enums_" + struct_name.replace("_", "_1") + "_init (JNIEnv * env, jclass clz) {\n")
1051             write_c("\t" + struct_name + "_class = (*env)->NewGlobalRef(env, clz);\n")
1052             write_c("\tCHECK(" + struct_name + "_class != NULL);\n")
1053             for idx, struct_line in enumerate(field_lines):
1054                 if idx > 0 and idx < len(field_lines) - 3:
1055                     variant = struct_line.strip().strip(",")
1056                     write_c("\t" + struct_name + "_" + variant + " = (*env)->GetStaticFieldID(env, " + struct_name + "_class, \"" + variant + "\", \"Lorg/ldk/enums/" + struct_name + ";\");\n")
1057                     write_c("\tCHECK(" + struct_name + "_" + variant + " != NULL);\n")
1058             write_c("}\n")
1059             write_c("static inline jclass " + struct_name + "_to_java(JNIEnv *env, " + struct_name + " val) {\n")
1060             write_c("\tswitch (val) {\n")
1061             for idx, struct_line in enumerate(field_lines):
1062                 if idx > 0 and idx < len(field_lines) - 3:
1063                     variant = struct_line.strip().strip(",")
1064                     write_c("\t\tcase " + variant + ":\n")
1065                     write_c("\t\t\treturn (*env)->GetStaticObjectField(env, " + struct_name + "_class, " + struct_name + "_" + variant + ");\n")
1066                     ord_v = ord_v + 1
1067             write_c("\t\tdefault: abort();\n")
1068             write_c("\t}\n")
1069             write_c("}\n\n")
1070
1071     def map_complex_enum(struct_name, union_enum_items):
1072         java_hu_type = struct_name.replace("LDK", "")
1073         complex_enums.add(struct_name)
1074         with open(sys.argv[3] + "/structs/" + java_hu_type + ".java", "w") as out_java_enum:
1075             out_java_enum.write(hu_struct_file_prefix)
1076             out_java_enum.write("public class " + java_hu_type + " extends CommonBase {\n")
1077             out_java_enum.write("\tprivate " + java_hu_type + "(Object _dummy, long ptr) { super(ptr); }\n")
1078             out_java_enum.write("\t@Override @SuppressWarnings(\"deprecation\")\n")
1079             out_java_enum.write("\tprotected void finalize() throws Throwable {\n")
1080             out_java_enum.write("\t\tsuper.finalize();\n")
1081             out_java_enum.write("\t\tif (ptr != 0) { bindings." + java_hu_type + "_free(ptr); }\n")
1082             out_java_enum.write("\t}\n")
1083             out_java_enum.write("\tstatic " + java_hu_type + " constr_from_ptr(long ptr) {\n")
1084             out_java_enum.write("\t\tbindings." + struct_name + " raw_val = bindings." + struct_name + "_ref_from_ptr(ptr);\n")
1085             java_hu_subclasses = ""
1086
1087             tag_field_lines = union_enum_items["field_lines"]
1088             init_meth_jty_strs = {}
1089             for idx, struct_line in enumerate(tag_field_lines):
1090                 if idx == 0:
1091                     out_java.write("\tpublic static class " + struct_name + " {\n")
1092                     out_java.write("\t\tprivate " + struct_name + "() {}\n")
1093                 elif idx == len(tag_field_lines) - 3:
1094                     assert(struct_line.endswith("_Sentinel,"))
1095                 elif idx == len(tag_field_lines) - 2:
1096                     out_java.write("\t\tstatic native void init();\n")
1097                     out_java.write("\t}\n")
1098                 elif idx == len(tag_field_lines) - 1:
1099                     assert(struct_line == "")
1100                 else:
1101                     var_name = struct_line.strip(' ,')[len(struct_name) + 1:]
1102                     out_java.write("\t\tpublic final static class " + var_name + " extends " + struct_name + " {\n")
1103                     java_hu_subclasses = java_hu_subclasses + "\tpublic final static class " + var_name + " extends " + java_hu_type + " {\n"
1104                     out_java_enum.write("\t\tif (raw_val.getClass() == bindings." + struct_name + "." + var_name + ".class) {\n")
1105                     out_java_enum.write("\t\t\treturn new " + var_name + "(ptr, (bindings." + struct_name + "." + var_name + ")raw_val);\n")
1106                     write_c("static jclass " + struct_name + "_" + var_name + "_class = NULL;\n")
1107                     write_c("static jmethodID " + struct_name + "_" + var_name + "_meth = NULL;\n")
1108                     init_meth_jty_str = ""
1109                     init_meth_params = ""
1110                     init_meth_body = ""
1111                     hu_conv_body = ""
1112                     if "LDK" + var_name in union_enum_items:
1113                         enum_var_lines = union_enum_items["LDK" + var_name]
1114                         for idx, field in enumerate(enum_var_lines):
1115                             if idx != 0 and idx < len(enum_var_lines) - 2:
1116                                 field_ty = map_type(field.strip(' ;'), False, None, False, True)
1117                                 out_java.write("\t\t\tpublic " + field_ty.java_ty + " " + field_ty.arg_name + ";\n")
1118                                 java_hu_subclasses = java_hu_subclasses + "\t\tpublic final " + field_ty.java_hu_ty + " " + field_ty.arg_name + ";\n"
1119                                 if field_ty.to_hu_conv is not None:
1120                                     hu_conv_body = hu_conv_body + "\t\t\t" + field_ty.java_ty + " " + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
1121                                     hu_conv_body = hu_conv_body + "\t\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
1122                                     hu_conv_body = hu_conv_body + "\t\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
1123                                 else:
1124                                     hu_conv_body = hu_conv_body + "\t\t\tthis." + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
1125                                 init_meth_jty_str = init_meth_jty_str + field_ty.java_fn_ty_arg
1126                                 if idx > 1:
1127                                     init_meth_params = init_meth_params + ", "
1128                                 init_meth_params = init_meth_params + field_ty.java_ty + " " + field_ty.arg_name
1129                                 init_meth_body = init_meth_body + "this." + field_ty.arg_name + " = " + field_ty.arg_name + "; "
1130                         out_java.write("\t\t\t" + var_name + "(" + init_meth_params + ") { ")
1131                         out_java.write(init_meth_body)
1132                         out_java.write("}\n")
1133                     out_java.write("\t\t}\n")
1134                     out_java_enum.write("\t\t}\n")
1135                     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"
1136                     java_hu_subclasses = java_hu_subclasses + hu_conv_body
1137                     java_hu_subclasses = java_hu_subclasses + "\t\t}\n\t}\n"
1138                     init_meth_jty_strs[var_name] = init_meth_jty_str
1139             out_java_enum.write("\t\tassert false; return null; // Unreachable without extending the (internal) bindings interface\n\t}\n\n")
1140             out_java_enum.write(java_hu_subclasses)
1141             out_java.write("\tstatic { " + struct_name + ".init(); }\n")
1142             out_java.write("\tpublic static native " + struct_name + " " + struct_name + "_ref_from_ptr(long ptr);\n");
1143
1144             write_c("JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_00024" + struct_name.replace("_", "_1") + "_init (JNIEnv * env, jclass _a) {\n")
1145             for idx, struct_line in enumerate(tag_field_lines):
1146                 if idx != 0 and idx < len(tag_field_lines) - 3:
1147                     var_name = struct_line.strip(' ,')[len(struct_name) + 1:]
1148                     write_c("\t" + struct_name + "_" + var_name + "_class =\n")
1149                     write_c("\t\t(*env)->NewGlobalRef(env, (*env)->FindClass(env, \"Lorg/ldk/impl/bindings$" + struct_name + "$" + var_name + ";\"));\n")
1150                     write_c("\tCHECK(" + struct_name + "_" + var_name + "_class != NULL);\n")
1151                     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")
1152                     write_c("\tCHECK(" + struct_name + "_" + var_name + "_meth != NULL);\n")
1153             write_c("}\n")
1154             write_c("JNIEXPORT jobject JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1ref_1from_1ptr (JNIEnv * _env, jclass _c, jlong ptr) {\n")
1155             write_c("\t" + struct_name + " *obj = (" + struct_name + "*)ptr;\n")
1156             write_c("\tswitch(obj->tag) {\n")
1157             for idx, struct_line in enumerate(tag_field_lines):
1158                 if idx != 0 and idx < len(tag_field_lines) - 3:
1159                     var_name = struct_line.strip(' ,')[len(struct_name) + 1:]
1160                     write_c("\t\tcase " + struct_name + "_" + var_name + ": {\n")
1161                     c_params_text = ""
1162                     if "LDK" + var_name in union_enum_items:
1163                         enum_var_lines = union_enum_items["LDK" + var_name]
1164                         for idx, field in enumerate(enum_var_lines):
1165                             if idx != 0 and idx < len(enum_var_lines) - 2:
1166                                 field_map = map_type(field.strip(' ;'), False, None, False, True)
1167                                 if field_map.ret_conv is not None:
1168                                     write_c("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
1169                                     write_c("obj->" + camel_to_snake(var_name) + "." + field_map.arg_name)
1170                                     write_c(field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
1171                                     c_params_text = c_params_text + ", " + field_map.ret_conv_name
1172                                 else:
1173                                     c_params_text = c_params_text + ", obj->" + camel_to_snake(var_name) + "." + field_map.arg_name
1174                     write_c("\t\t\treturn (*_env)->NewObject(_env, " + struct_name + "_" + var_name + "_class, " + struct_name + "_" + var_name + "_meth" + c_params_text + ");\n")
1175                     write_c("\t\t}\n")
1176             write_c("\t\tdefault: abort();\n")
1177             write_c("\t}\n}\n")
1178             out_java_enum.write("}\n")
1179
1180     def map_trait(struct_name, field_var_lines, trait_fn_lines):
1181         with open(sys.argv[3] + "/structs/" + struct_name.replace("LDK","") + ".java", "w") as out_java_trait:
1182             write_c("typedef struct " + struct_name + "_JCalls {\n")
1183             write_c("\tatomic_size_t refcnt;\n")
1184             write_c("\tJavaVM *vm;\n")
1185             write_c("\tjweak o;\n")
1186             field_var_convs = []
1187             for var_line in field_var_lines:
1188                 if var_line.group(1) in trait_structs:
1189                     write_c("\t" + var_line.group(1) + "_JCalls* " + var_line.group(2) + ";\n")
1190                     field_var_convs.append(None)
1191                 else:
1192                     field_var_convs.append(map_type(var_line.group(1) + " " + var_line.group(2), False, None, False, False))
1193             for fn_line in trait_fn_lines:
1194                 if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
1195                     write_c("\tjmethodID " + fn_line.group(2) + "_meth;\n")
1196             write_c("} " + struct_name + "_JCalls;\n")
1197
1198             out_java_trait.write(hu_struct_file_prefix)
1199             out_java_trait.write("public class " + struct_name.replace("LDK","") + " extends CommonBase {\n")
1200             out_java_trait.write("\tfinal bindings." + struct_name + " bindings_instance;\n")
1201             out_java_trait.write("\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); bindings_instance = null; }\n")
1202             out_java_trait.write("\tprivate " + struct_name.replace("LDK", "") + "(bindings." + struct_name + " arg")
1203             for idx, var_line in enumerate(field_var_lines):
1204                 if var_line.group(1) in trait_structs:
1205                     out_java_trait.write(", bindings." + var_line.group(1) + " " + var_line.group(2))
1206                 else:
1207                     out_java_trait.write(", " + field_var_convs[idx].java_hu_ty + " " + var_line.group(2))
1208             out_java_trait.write(") {\n")
1209             out_java_trait.write("\t\tsuper(bindings." + struct_name + "_new(arg")
1210             for idx, var_line in enumerate(field_var_lines):
1211                 if var_line.group(1) in trait_structs:
1212                     out_java_trait.write(", " + var_line.group(2))
1213                 elif field_var_convs[idx].from_hu_conv is not None:
1214                     out_java_trait.write(", " + field_var_convs[idx].from_hu_conv[0])
1215                 else:
1216                     out_java_trait.write(", " + var_line.group(2))
1217             out_java_trait.write("));\n")
1218             out_java_trait.write("\t\tthis.ptrs_to.add(arg);\n")
1219             for idx, var_line in enumerate(field_var_lines):
1220                 if var_line.group(1) in trait_structs:
1221                     out_java_trait.write("\t\tthis.ptrs_to.add(" + var_line.group(2) + ");\n")
1222                 elif field_var_convs[idx].from_hu_conv is not None and field_var_convs[idx].from_hu_conv[1] != "":
1223                     out_java_trait.write("\t\t" + field_var_convs[idx].from_hu_conv[1] + ";\n")
1224             out_java_trait.write("\t\tthis.bindings_instance = arg;\n")
1225             out_java_trait.write("\t}\n")
1226             out_java_trait.write("\t@Override @SuppressWarnings(\"deprecation\")\n")
1227             out_java_trait.write("\tprotected void finalize() throws Throwable {\n")
1228             out_java_trait.write("\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); } super.finalize();\n")
1229             out_java_trait.write("\t}\n\n")
1230
1231             java_trait_constr = "\tprivate static class " + struct_name + "Holder { " + struct_name.replace("LDK", "") + " held; }\n"
1232             java_trait_constr = java_trait_constr + "\tpublic static " + struct_name.replace("LDK", "") + " new_impl(" + struct_name.replace("LDK", "") + "Interface arg"
1233             for idx, var_line in enumerate(field_var_lines):
1234                 if var_line.group(1) in trait_structs:
1235                     # Ideally we'd be able to take any instance of the interface, but our C code can only represent
1236                     # Java-implemented version, so we require users pass a Java implementation here :/
1237                     java_trait_constr = java_trait_constr + ", " + var_line.group(1).replace("LDK", "") + "." + var_line.group(1).replace("LDK", "") + "Interface " + var_line.group(2) + "_impl"
1238                 else:
1239                     java_trait_constr = java_trait_constr + ", " + field_var_convs[idx].java_hu_ty + " " + var_line.group(2)
1240             java_trait_constr = java_trait_constr + ") {\n\t\tfinal " + struct_name + "Holder impl_holder = new " + struct_name + "Holder();\n"
1241             java_trait_constr = java_trait_constr + "\t\timpl_holder.held = new " + struct_name.replace("LDK", "") + "(new bindings." + struct_name + "() {\n"
1242             out_java_trait.write("\tpublic static interface " + struct_name.replace("LDK", "") + "Interface {\n")
1243             out_java.write("\tpublic interface " + struct_name + " {\n")
1244             java_meths = []
1245             for fn_line in trait_fn_lines:
1246                 java_meth_descr = "("
1247                 if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
1248                     ret_ty_info = map_type(fn_line.group(1), True, None, False, False)
1249
1250                     out_java.write("\t\t " + ret_ty_info.java_ty + " " + fn_line.group(2) + "(")
1251                     java_trait_constr = java_trait_constr + "\t\t\t@Override public " + ret_ty_info.java_ty + " " + fn_line.group(2) + "("
1252                     out_java_trait.write("\t\t" + ret_ty_info.java_hu_ty + " " + fn_line.group(2) + "(")
1253                     is_const = fn_line.group(3) is not None
1254                     write_c(fn_line.group(1) + fn_line.group(2) + "_jcall(")
1255                     if is_const:
1256                         write_c("const void* this_arg")
1257                     else:
1258                         write_c("void* this_arg")
1259
1260                     arg_names = []
1261                     for idx, arg in enumerate(fn_line.group(4).split(',')):
1262                         if arg == "":
1263                             continue
1264                         if idx >= 2:
1265                             out_java.write(", ")
1266                             java_trait_constr = java_trait_constr + ", "
1267                             out_java_trait.write(", ")
1268                         write_c(", ")
1269                         arg_conv_info = map_type(arg, True, None, False, False)
1270                         write_c(arg.strip())
1271                         out_java.write(arg_conv_info.java_ty + " " + arg_conv_info.arg_name)
1272                         out_java_trait.write(arg_conv_info.java_hu_ty + " " + arg_conv_info.arg_name)
1273                         java_trait_constr = java_trait_constr + arg_conv_info.java_ty + " " + arg_conv_info.arg_name
1274                         arg_names.append(arg_conv_info)
1275                         java_meth_descr = java_meth_descr + arg_conv_info.java_fn_ty_arg
1276                     java_meth_descr = java_meth_descr + ")" + ret_ty_info.java_fn_ty_arg
1277                     java_meths.append(java_meth_descr)
1278
1279                     out_java.write(");\n")
1280                     out_java_trait.write(");\n")
1281                     java_trait_constr = java_trait_constr + ") {\n"
1282                     write_c(") {\n")
1283                     write_c("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
1284                     write_c("\tJNIEnv *_env;\n")
1285                     write_c("\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&_env, JNI_VERSION_1_8) == JNI_OK);\n")
1286
1287                     for arg_info in arg_names:
1288                         if arg_info.ret_conv is not None:
1289                             write_c("\t" + arg_info.ret_conv[0].replace('\n', '\n\t'));
1290                             write_c(arg_info.arg_name)
1291                             write_c(arg_info.ret_conv[1].replace('\n', '\n\t') + "\n")
1292                         if arg_info.to_hu_conv is not None:
1293                             java_trait_constr = java_trait_constr + "\t\t\t\t" + arg_info.to_hu_conv.replace("\n", "\n\t\t\t\t") + "\n"
1294
1295                     write_c("\tjobject obj = (*_env)->NewLocalRef(_env, j_calls->o);\n\tCHECK(obj != NULL);\n")
1296                     if ret_ty_info.c_ty.endswith("Array"):
1297                         write_c("\t" + ret_ty_info.c_ty + " arg = (*_env)->CallObjectMethod(_env, obj, j_calls->" + fn_line.group(2) + "_meth")
1298                     elif not ret_ty_info.passed_as_ptr:
1299                         write_c("\treturn (*_env)->Call" + ret_ty_info.java_ty.title() + "Method(_env, obj, j_calls->" + fn_line.group(2) + "_meth")
1300                     else:
1301                         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");
1302                     if ret_ty_info.java_ty != "void":
1303                         java_trait_constr = java_trait_constr + "\t\t\t\t" + ret_ty_info.java_hu_ty + " ret = arg." + fn_line.group(2) + "("
1304                     else:
1305                         java_trait_constr = java_trait_constr + "\t\t\t\targ." + fn_line.group(2) + "("
1306
1307                     for idx, arg_info in enumerate(arg_names):
1308                         if arg_info.ret_conv is not None:
1309                             write_c(", " + arg_info.ret_conv_name)
1310                         else:
1311                             write_c(", " + arg_info.arg_name)
1312                         if idx != 0:
1313                             java_trait_constr = java_trait_constr + ", "
1314                         if arg_info.to_hu_conv_name is not None:
1315                             java_trait_constr = java_trait_constr + arg_info.to_hu_conv_name
1316                         else:
1317                             java_trait_constr = java_trait_constr + arg_info.arg_name
1318                     write_c(");\n");
1319                     if ret_ty_info.arg_conv is not None:
1320                         write_c("\t" + ret_ty_info.arg_conv.replace("\n", "\n\t") + "\n\treturn " + ret_ty_info.arg_conv_name + ";\n")
1321
1322                     write_c("}\n")
1323                     java_trait_constr = java_trait_constr + ");\n"
1324                     if ret_ty_info.java_ty != "void":
1325                         if ret_ty_info.from_hu_conv is not None:
1326                             java_trait_constr = java_trait_constr + "\t\t\t\t" + ret_ty_info.java_ty + " result = " + ret_ty_info.from_hu_conv[0] + ";\n"
1327                             if ret_ty_info.from_hu_conv[1] != "":
1328                                 java_trait_constr = java_trait_constr + "\t\t\t\t" + ret_ty_info.from_hu_conv[1].replace("this", "impl_holder.held") + ";\n"
1329                             if is_common_base_ext(ret_ty_info.rust_obj):
1330                                 java_trait_constr = java_trait_constr + "\t\t\t\tret.ptr = 0;\n"
1331                             java_trait_constr = java_trait_constr + "\t\t\t\treturn result;\n"
1332                         else:
1333                             java_trait_constr = java_trait_constr + "\t\t\t\treturn ret;\n"
1334                     java_trait_constr = java_trait_constr + "\t\t\t}\n"
1335                 elif fn_line.group(2) == "free":
1336                     write_c("static void " + struct_name + "_JCalls_free(void* this_arg) {\n")
1337                     write_c("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
1338                     write_c("\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n")
1339                     write_c("\t\tJNIEnv *env;\n")
1340                     write_c("\t\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_8) == JNI_OK);\n")
1341                     write_c("\t\t(*env)->DeleteWeakGlobalRef(env, j_calls->o);\n")
1342                     write_c("\t\tFREE(j_calls);\n")
1343                     write_c("\t}\n}\n")
1344             java_trait_constr = java_trait_constr + "\t\t}"
1345             for var_line in field_var_lines:
1346                 if var_line.group(1) in trait_structs:
1347                     java_trait_constr = java_trait_constr + ", " + var_line.group(2) + ".new_impl(" + var_line.group(2) + "_impl).bindings_instance"
1348                 else:
1349                     java_trait_constr = java_trait_constr + ", " + var_line.group(2)
1350             out_java_trait.write("\t}\n")
1351             out_java_trait.write(java_trait_constr + ");\n\t\treturn impl_holder.held;\n\t}\n")
1352
1353             # Write out a clone function whether we need one or not, as we use them in moving to rust
1354             write_c("static void* " + struct_name + "_JCalls_clone(const void* this_arg) {\n")
1355             write_c("\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n")
1356             write_c("\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n")
1357             for var_line in field_var_lines:
1358                 if var_line.group(1) in trait_structs:
1359                     write_c("\tatomic_fetch_add_explicit(&j_calls->" + var_line.group(2) + "->refcnt, 1, memory_order_release);\n")
1360             write_c("\treturn (void*) this_arg;\n")
1361             write_c("}\n")
1362
1363             out_java.write("\t}\n")
1364
1365             out_java.write("\tpublic static native long " + struct_name + "_new(" + struct_name + " impl")
1366             write_c("static inline " + struct_name + " " + struct_name + "_init (JNIEnv * env, jclass _a, jobject o")
1367             for idx, var_line in enumerate(field_var_lines):
1368                 if var_line.group(1) in trait_structs:
1369                     out_java.write(", " + var_line.group(1) + " " + var_line.group(2))
1370                     write_c(", jobject " + var_line.group(2))
1371                 else:
1372                     out_java.write(", " + field_var_convs[idx].java_ty + " " + var_line.group(2))
1373                     write_c(", " + field_var_convs[idx].c_ty + " " + var_line.group(2))
1374             out_java.write(");\n")
1375             write_c(") {\n")
1376
1377             write_c("\tjclass c = (*env)->GetObjectClass(env, o);\n")
1378             write_c("\tCHECK(c != NULL);\n")
1379             write_c("\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n")
1380             write_c("\tatomic_init(&calls->refcnt, 1);\n")
1381             write_c("\tDO_ASSERT((*env)->GetJavaVM(env, &calls->vm) == 0);\n")
1382             write_c("\tcalls->o = (*env)->NewWeakGlobalRef(env, o);\n")
1383             for (fn_line, java_meth_descr) in zip(trait_fn_lines, java_meths):
1384                 if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
1385                     write_c("\tcalls->" + fn_line.group(2) + "_meth = (*env)->GetMethodID(env, c, \"" + fn_line.group(2) + "\", \"" + java_meth_descr + "\");\n")
1386                     write_c("\tCHECK(calls->" + fn_line.group(2) + "_meth != NULL);\n")
1387             for idx, var_line in enumerate(field_var_lines):
1388                 if field_var_convs[idx] is not None and field_var_convs[idx].arg_conv is not None:
1389                     write_c("\n\t" + field_var_convs[idx].arg_conv.replace("\n", "\n\t") +"\n")
1390             write_c("\n\t" + struct_name + " ret = {\n")
1391             write_c("\t\t.this_arg = (void*) calls,\n")
1392             for fn_line in trait_fn_lines:
1393                 if fn_line.group(2) != "free" and fn_line.group(2) != "clone":
1394                     write_c("\t\t." + fn_line.group(2) + " = " + fn_line.group(2) + "_jcall,\n")
1395                 elif fn_line.group(2) == "free":
1396                     write_c("\t\t.free = " + struct_name + "_JCalls_free,\n")
1397                 else:
1398                     clone_fns.add(struct_name + "_clone")
1399                     write_c("\t\t.clone = " + struct_name + "_JCalls_clone,\n")
1400             for idx, var_line in enumerate(field_var_lines):
1401                 if var_line.group(1) in trait_structs:
1402                     write_c("\t\t." + var_line.group(2) + " = " + var_line.group(1) + "_init(env, _a, " + var_line.group(2) + "),\n")
1403                 elif field_var_convs[idx].arg_conv_name is not None:
1404                     write_c("\t\t." + var_line.group(2) + " = " + field_var_convs[idx].arg_conv_name + ",\n")
1405                     write_c("\t\t.set_" + var_line.group(2) + " = NULL,\n")
1406                 else:
1407                     write_c("\t\t." + var_line.group(2) + " = " + var_line.group(2) + ",\n")
1408                     write_c("\t\t.set_" + var_line.group(2) + " = NULL,\n")
1409             write_c("\t};\n")
1410             for var_line in field_var_lines:
1411                 if var_line.group(1) in trait_structs:
1412                     write_c("\tcalls->" + var_line.group(2) + " = ret." + var_line.group(2) + ".this_arg;\n")
1413             write_c("\treturn ret;\n")
1414             write_c("}\n")
1415
1416             write_c("JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1new (JNIEnv * env, jclass _a, jobject o")
1417             for idx, var_line in enumerate(field_var_lines):
1418                 if var_line.group(1) in trait_structs:
1419                     write_c(", jobject " + var_line.group(2))
1420                 else:
1421                     write_c(", " + field_var_convs[idx].c_ty + " " + var_line.group(2))
1422             write_c(") {\n")
1423             write_c("\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n")
1424             write_c("\t*res_ptr = " + struct_name + "_init(env, _a, o")
1425             for var_line in field_var_lines:
1426                 write_c(", " + var_line.group(2))
1427             write_c(");\n")
1428             write_c("\treturn (long)res_ptr;\n")
1429             write_c("}\n")
1430
1431             out_java.write("\tpublic static native " + struct_name + " " + struct_name + "_get_obj_from_jcalls(long val);\n")
1432             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")
1433             write_c("\tjobject ret = (*env)->NewLocalRef(env, ((" + struct_name + "_JCalls*)val)->o);\n")
1434             write_c("\tCHECK(ret != NULL);\n")
1435             write_c("\treturn ret;\n")
1436             write_c("}\n")
1437
1438         for fn_line in trait_fn_lines:
1439             # For now, just disable enabling the _call_log - we don't know how to inverse-map String
1440             is_log = fn_line.group(2) == "log" and struct_name == "LDKLogger"
1441             if fn_line.group(2) != "free" and fn_line.group(2) != "clone" and fn_line.group(2) != "eq" and not is_log:
1442                 dummy_line = fn_line.group(1) + struct_name.replace("LDK", "") + "_" + fn_line.group(2) + " " + struct_name + "* this_arg" + fn_line.group(4) + "\n"
1443                 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")
1444         for idx, var_line in enumerate(field_var_lines):
1445             if var_line.group(1) not in trait_structs:
1446                 write_c(var_line.group(1) + " " + struct_name + "_set_get_" + var_line.group(2) + "(" + struct_name + "* this_arg) {\n")
1447                 write_c("\tif (this_arg->set_" + var_line.group(2) + " != NULL)\n")
1448                 write_c("\t\tthis_arg->set_" + var_line.group(2) + "(this_arg);\n")
1449                 write_c("\treturn this_arg->" + var_line.group(2) + ";\n")
1450                 write_c("}\n")
1451                 dummy_line = var_line.group(1) + " " + struct_name.replace("LDK", "") + "_get_" + var_line.group(2) + " " + struct_name + "* this_arg" + fn_line.group(4) + "\n"
1452                 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")
1453
1454     out_java.write("""package org.ldk.impl;
1455 import org.ldk.enums.*;
1456
1457 public class bindings {
1458         public static class VecOrSliceDef {
1459                 public long dataptr;
1460                 public long datalen;
1461                 public long stride;
1462                 public VecOrSliceDef(long dataptr, long datalen, long stride) {
1463                         this.dataptr = dataptr; this.datalen = datalen; this.stride = stride;
1464                 }
1465         }
1466         static {
1467                 System.loadLibrary(\"lightningjni\");
1468                 init(java.lang.Enum.class, VecOrSliceDef.class);
1469                 init_class_cache();
1470         }
1471         static native void init(java.lang.Class c, java.lang.Class slicedef);
1472         static native void init_class_cache();
1473
1474         public static native boolean deref_bool(long ptr);
1475         public static native long deref_long(long ptr);
1476         public static native void free_heap_ptr(long ptr);
1477         public static native byte[] read_bytes(long ptr, long len);
1478         public static native byte[] get_u8_slice_bytes(long slice_ptr);
1479         public static native long bytes_to_u8_vec(byte[] bytes);
1480         public static native long new_txpointer_copy_data(byte[] txdata);
1481         public static native void txpointer_free(long ptr);
1482         public static native byte[] txpointer_get_buffer(long ptr);
1483         public static native long vec_slice_len(long vec);
1484         public static native long new_empty_slice_vec();
1485
1486 """)
1487     write_c("""
1488 static jmethodID ordinal_meth = NULL;
1489 static jmethodID slicedef_meth = NULL;
1490 static jclass slicedef_cls = NULL;
1491 JNIEXPORT void Java_org_ldk_impl_bindings_init(JNIEnv * env, jclass _b, jclass enum_class, jclass slicedef_class) {
1492         ordinal_meth = (*env)->GetMethodID(env, enum_class, "ordinal", "()I");
1493         CHECK(ordinal_meth != NULL);
1494         slicedef_meth = (*env)->GetMethodID(env, slicedef_class, "<init>", "(JJJ)V");
1495         CHECK(slicedef_meth != NULL);
1496         slicedef_cls = (*env)->NewGlobalRef(env, slicedef_class);
1497         CHECK(slicedef_cls != NULL);
1498 }
1499
1500 JNIEXPORT jboolean JNICALL Java_org_ldk_impl_bindings_deref_1bool (JNIEnv * env, jclass _a, jlong ptr) {
1501         return *((bool*)ptr);
1502 }
1503 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_deref_1long (JNIEnv * env, jclass _a, jlong ptr) {
1504         return *((long*)ptr);
1505 }
1506 JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_free_1heap_1ptr (JNIEnv * env, jclass _a, jlong ptr) {
1507         FREE((void*)ptr);
1508 }
1509 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_read_1bytes (JNIEnv * _env, jclass _b, jlong ptr, jlong len) {
1510         jbyteArray ret_arr = (*_env)->NewByteArray(_env, len);
1511         (*_env)->SetByteArrayRegion(_env, ret_arr, 0, len, (unsigned char*)ptr);
1512         return ret_arr;
1513 }
1514 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_get_1u8_1slice_1bytes (JNIEnv * _env, jclass _b, jlong slice_ptr) {
1515         LDKu8slice *slice = (LDKu8slice*)slice_ptr;
1516         jbyteArray ret_arr = (*_env)->NewByteArray(_env, slice->datalen);
1517         (*_env)->SetByteArrayRegion(_env, ret_arr, 0, slice->datalen, slice->data);
1518         return ret_arr;
1519 }
1520 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_bytes_1to_1u8_1vec (JNIEnv * _env, jclass _b, jbyteArray bytes) {
1521         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "LDKCVec_u8");
1522         vec->datalen = (*_env)->GetArrayLength(_env, bytes);
1523         vec->data = (uint8_t*)MALLOC(vec->datalen, "LDKCVec_u8Z Bytes");
1524         (*_env)->GetByteArrayRegion (_env, bytes, 0, vec->datalen, vec->data);
1525         return (long)vec;
1526 }
1527 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_txpointer_1get_1buffer (JNIEnv * env, jclass _b, jlong ptr) {
1528         LDKTransaction *txdata = (LDKTransaction*)ptr;
1529         LDKu8slice slice;
1530         slice.data = txdata->data;
1531         slice.datalen = txdata->datalen;
1532         return Java_org_ldk_impl_bindings_get_1u8_1slice_1bytes(env, _b, (long)&slice);
1533 }
1534 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_new_1txpointer_1copy_1data (JNIEnv * env, jclass _b, jbyteArray bytes) {
1535         LDKTransaction *txdata = (LDKTransaction*)MALLOC(sizeof(LDKTransaction), "LDKTransaction");
1536         txdata->datalen = (*env)->GetArrayLength(env, bytes);
1537         txdata->data = (uint8_t*)MALLOC(txdata->datalen, "Tx Data Bytes");
1538         txdata->data_is_owned = false;
1539         (*env)->GetByteArrayRegion (env, bytes, 0, txdata->datalen, txdata->data);
1540         return (long)txdata;
1541 }
1542 JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_txpointer_1free (JNIEnv * env, jclass _b, jlong ptr) {
1543         LDKTransaction *tx = (LDKTransaction*)ptr;
1544         tx->data_is_owned = true;
1545         Transaction_free(*tx);
1546         FREE((void*)ptr);
1547 }
1548 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_vec_1slice_1len (JNIEnv * env, jclass _a, jlong ptr) {
1549         // Check offsets of a few Vec types are all consistent as we're meant to be generic across types
1550         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_SignatureZ, datalen), "Vec<*> needs to be mapped identically");
1551         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_MessageSendEventZ, datalen), "Vec<*> needs to be mapped identically");
1552         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_EventZ, datalen), "Vec<*> needs to be mapped identically");
1553         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_C2Tuple_usizeTransactionZZ, datalen), "Vec<*> needs to be mapped identically");
1554         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)ptr;
1555         return (long)vec->datalen;
1556 }
1557 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_new_1empty_1slice_1vec (JNIEnv * _env, jclass _b) {
1558         // Check sizes of a few Vec types are all consistent as we're meant to be generic across types
1559         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_SignatureZ), "Vec<*> needs to be mapped identically");
1560         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_MessageSendEventZ), "Vec<*> needs to be mapped identically");
1561         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_EventZ), "Vec<*> needs to be mapped identically");
1562         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_C2Tuple_usizeTransactionZZ), "Vec<*> needs to be mapped identically");
1563         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "Empty LDKCVec");
1564         vec->data = NULL;
1565         vec->datalen = 0;
1566         return (long)vec;
1567 }
1568
1569 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
1570 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
1571 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
1572 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
1573
1574 """)
1575
1576     with open(sys.argv[3] + "/structs/CommonBase.java", "a") as out_java_struct:
1577         out_java_struct.write("""package org.ldk.structs;
1578 import java.util.LinkedList;
1579 class CommonBase {
1580         long ptr;
1581         LinkedList<Object> ptrs_to = new LinkedList();
1582         protected CommonBase(long ptr) { this.ptr = ptr; }
1583         public long _test_only_get_ptr() { return this.ptr; }
1584 }
1585 """)
1586
1587     in_block_comment = False
1588     cur_block_obj = None
1589
1590     const_val_regex = re.compile("^extern const ([A-Za-z_0-9]*) ([A-Za-z_0-9]*);$")
1591
1592     line_indicates_result_regex = re.compile("^   (LDKCResultPtr_[A-Za-z_0-9]*) contents;$")
1593     line_indicates_vec_regex = re.compile("^   ([A-Za-z_0-9]*) \*data;$")
1594     line_indicates_opaque_regex = re.compile("^   bool is_owned;$")
1595     line_indicates_trait_regex = re.compile("^   ([A-Za-z_0-9]* \*?)\(\*([A-Za-z_0-9]*)\)\((const )?void \*this_arg(.*)\);$")
1596     assert(line_indicates_trait_regex.match("   uintptr_t (*send_data)(void *this_arg, LDKu8slice data, bool resume_read);"))
1597     assert(line_indicates_trait_regex.match("   LDKCVec_MessageSendEventZ (*get_and_clear_pending_msg_events)(const void *this_arg);"))
1598     assert(line_indicates_trait_regex.match("   void *(*clone)(const void *this_arg);"))
1599     line_field_var_regex = re.compile("^   ([A-Za-z_0-9]*) ([A-Za-z_0-9]*);$")
1600     assert(line_field_var_regex.match("   LDKMessageSendEventsProvider MessageSendEventsProvider;"))
1601     assert(line_field_var_regex.match("   LDKChannelPublicKeys pubkeys;"))
1602     struct_name_regex = re.compile("^typedef (struct|enum|union) (MUST_USE_STRUCT )?(LDK[A-Za-z_0-9]*) {$")
1603     assert(struct_name_regex.match("typedef struct LDKCVecTempl_u8 {"))
1604     assert(struct_name_regex.match("typedef enum LDKNetwork {"))
1605     struct_alias_regex = re.compile("^typedef (LDK[A-Za-z_0-9]*) (LDK[A-Za-z_0-9]*);$")
1606     assert(struct_alias_regex.match("typedef LDKCResultTempl_bool__PeerHandleError LDKCResult_boolPeerHandleErrorZ;"))
1607
1608     result_templ_structs = set()
1609     union_enum_items = {}
1610     result_ptr_struct_items = {}
1611     for line in in_h:
1612         if in_block_comment:
1613             if line.endswith("*/\n"):
1614                 in_block_comment = False
1615         elif cur_block_obj is not None:
1616             cur_block_obj  = cur_block_obj + line
1617             if line.startswith("} "):
1618                 field_lines = []
1619                 struct_name = None
1620                 vec_ty = None
1621                 obj_lines = cur_block_obj.split("\n")
1622                 is_opaque = False
1623                 result_contents = None
1624                 is_unitary_enum = False
1625                 is_union_enum = False
1626                 is_union = False
1627                 is_tuple = False
1628                 trait_fn_lines = []
1629                 field_var_lines = []
1630
1631                 for idx, struct_line in enumerate(obj_lines):
1632                     if struct_line.strip().startswith("/*"):
1633                         in_block_comment = True
1634                     if in_block_comment:
1635                         if struct_line.endswith("*/"):
1636                             in_block_comment = False
1637                     else:
1638                         struct_name_match = struct_name_regex.match(struct_line)
1639                         if struct_name_match is not None:
1640                             struct_name = struct_name_match.group(3)
1641                             if struct_name_match.group(1) == "enum":
1642                                 if not struct_name.endswith("_Tag"):
1643                                     is_unitary_enum = True
1644                                 else:
1645                                     is_union_enum = True
1646                             elif struct_name_match.group(1) == "union":
1647                                 is_union = True
1648                         if line_indicates_opaque_regex.match(struct_line):
1649                             is_opaque = True
1650                         result_match = line_indicates_result_regex.match(struct_line)
1651                         if result_match is not None:
1652                             result_contents = result_match.group(1)
1653                         vec_ty_match = line_indicates_vec_regex.match(struct_line)
1654                         if vec_ty_match is not None and struct_name.startswith("LDKCVecTempl_"):
1655                             vec_ty = vec_ty_match.group(1)
1656                         elif struct_name.startswith("LDKC2TupleTempl_") or struct_name.startswith("LDKC3TupleTempl_"):
1657                             is_tuple = True
1658                         trait_fn_match = line_indicates_trait_regex.match(struct_line)
1659                         if trait_fn_match is not None:
1660                             trait_fn_lines.append(trait_fn_match)
1661                         field_var_match = line_field_var_regex.match(struct_line)
1662                         if field_var_match is not None:
1663                             field_var_lines.append(field_var_match)
1664                         field_lines.append(struct_line)
1665
1666                 assert(struct_name is not None)
1667                 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))
1668                 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))
1669                 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))
1670                 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))
1671                 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))
1672                 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))
1673                 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))
1674
1675                 if is_opaque:
1676                     opaque_structs.add(struct_name)
1677                     with open(sys.argv[3] + "/structs/" + struct_name.replace("LDK","") + ".java", "w") as out_java_struct:
1678                         out_java_struct.write(hu_struct_file_prefix)
1679                         out_java_struct.write("public class " + struct_name.replace("LDK","") + " extends CommonBase")
1680                         if struct_name.startswith("LDKLocked"):
1681                             out_java_struct.write(" implements AutoCloseable")
1682                         out_java_struct.write(" {\n")
1683                         out_java_struct.write("\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); }\n")
1684                         if struct_name.startswith("LDKLocked"):
1685                             out_java_struct.write("\t@Override public void close() {\n")
1686                         else:
1687                             out_java_struct.write("\t@Override @SuppressWarnings(\"deprecation\")\n")
1688                             out_java_struct.write("\tprotected void finalize() throws Throwable {\n")
1689                             out_java_struct.write("\t\tsuper.finalize();\n")
1690                         out_java_struct.write("\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); }\n")
1691                         out_java_struct.write("\t}\n\n")
1692                 elif result_contents is not None:
1693                     result_templ_structs.add(struct_name)
1694                     assert result_contents in result_ptr_struct_items
1695                 elif struct_name.startswith("LDKCResultPtr_"):
1696                     for line in field_lines:
1697                         if line.endswith("*result;"):
1698                             res_ty = line[:-8].strip()
1699                         elif line.endswith("*err;"):
1700                             err_ty = line[:-5].strip()
1701                     result_ptr_struct_items[struct_name] = (res_ty, err_ty)
1702                 elif is_tuple:
1703                     out_java.write("\tpublic static native long " + struct_name + "_new(")
1704                     write_c("JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1new(JNIEnv *_env, jclass _b")
1705                     ty_list = []
1706                     for idx, line in enumerate(field_lines):
1707                         if idx != 0 and idx < len(field_lines) - 2:
1708                             ty_info = java_c_types(line.strip(';'), None)
1709                             if idx != 1:
1710                                 out_java.write(", ")
1711                             e = chr(ord('a') + idx - 1)
1712                             out_java.write(ty_info.java_ty + " " + e)
1713                             write_c(", " + ty_info.c_ty + " " + e)
1714                             ty_list.append(ty_info)
1715                     tuple_types[struct_name] = (ty_list, struct_name)
1716                     out_java.write(");\n")
1717                     write_c(") {\n")
1718                     write_c("\t" + struct_name + "* ret = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n")
1719                     for idx, line in enumerate(field_lines):
1720                         if idx != 0 and idx < len(field_lines) - 2:
1721                             ty_info = map_type(line.strip(';'), False, None, False, False)
1722                             e = chr(ord('a') + idx - 1)
1723                             if ty_info.arg_conv is not None:
1724                                 write_c("\t" + ty_info.arg_conv.replace("\n", "\n\t"))
1725                                 write_c("\n\tret->" + e + " = " + ty_info.arg_conv_name + ";\n")
1726                             else:
1727                                 write_c("\tret->" + e + " = " + e + ";\n")
1728                             if ty_info.arg_conv_cleanup is not None:
1729                                 write_c("\t//TODO: Really need to call " + ty_info.arg_conv_cleanup + " here\n")
1730                     write_c("\treturn (long)ret;\n")
1731                     write_c("}\n")
1732                 elif vec_ty is not None:
1733                     if vec_ty in opaque_structs:
1734                         out_java.write("\tpublic static native long[] " + struct_name + "_arr_info(long vec_ptr);\n")
1735                         write_c("JNIEXPORT jlongArray JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1arr_1info(JNIEnv *env, jclass _b, jlong ptr) {\n")
1736                     else:
1737                         out_java.write("\tpublic static native VecOrSliceDef " + struct_name + "_arr_info(long vec_ptr);\n")
1738                         write_c("JNIEXPORT jobject JNICALL Java_org_ldk_impl_bindings_" + struct_name.replace("_", "_1") + "_1arr_1info(JNIEnv *env, jclass _b, jlong ptr) {\n")
1739                     write_c("\t" + struct_name + " *vec = (" + struct_name + "*)ptr;\n")
1740                     if vec_ty in opaque_structs:
1741                         write_c("\tjlongArray ret = (*env)->NewLongArray(env, vec->datalen);\n")
1742                         write_c("\tjlong *ret_elems = (*env)->GetPrimitiveArrayCritical(env, ret, NULL);\n")
1743                         write_c("\tfor (size_t i = 0; i < vec->datalen; i++) {\n")
1744                         write_c("\t\tCHECK((((long)vec->data[i].inner) & 1) == 0);\n")
1745                         write_c("\t\tret_elems[i] = (long)vec->data[i].inner | (vec->data[i].is_owned ? 1 : 0);\n")
1746                         write_c("\t}\n")
1747                         write_c("\t(*env)->ReleasePrimitiveArrayCritical(env, ret, ret_elems, 0);\n")
1748                         write_c("\treturn ret;\n")
1749                     else:
1750                         write_c("\treturn (*env)->NewObject(env, slicedef_cls, slicedef_meth, (long)vec->data, (long)vec->datalen, sizeof(" + vec_ty + "));\n")
1751                     write_c("}\n")
1752
1753                     ty_info = map_type(vec_ty + " arr_elem", False, None, False, False)
1754                     if len(ty_info.java_fn_ty_arg) == 1: # ie we're a primitive of some form
1755                         out_java.write("\tpublic static native long " + struct_name + "_new(" + ty_info.java_ty + "[] elems);\n")
1756                         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")
1757                         write_c("\t" + struct_name + " *ret = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n")
1758                         write_c("\tret->datalen = (*env)->GetArrayLength(env, elems);\n")
1759                         write_c("\tif (ret->datalen == 0) {\n")
1760                         write_c("\t\tret->data = NULL;\n")
1761                         write_c("\t} else {\n")
1762                         write_c("\t\tret->data = MALLOC(sizeof(" + vec_ty + ") * ret->datalen, \"" + struct_name + " Data\");\n")
1763                         write_c("\t\t" + ty_info.c_ty + " *java_elems = (*env)->GetPrimitiveArrayCritical(env, elems, NULL);\n")
1764                         write_c("\t\tfor (size_t i = 0; i < ret->datalen; i++) {\n")
1765                         if ty_info.arg_conv is not None:
1766                             write_c("\t\t\t" + ty_info.c_ty + " arr_elem = java_elems[i];\n")
1767                             write_c("\t\t\t" + ty_info.arg_conv.replace("\n", "\n\t\t\t") + "\n")
1768                             write_c("\t\t\tret->data[i] = " + ty_info.arg_conv_name + ";\n")
1769                             assert ty_info.arg_conv_cleanup is None
1770                         else:
1771                             write_c("\t\t\tret->data[i] = java_elems[i];\n")
1772                         write_c("\t\t}\n")
1773                         write_c("\t\t(*env)->ReleasePrimitiveArrayCritical(env, elems, java_elems, 0);\n")
1774                         write_c("\t}\n")
1775                         write_c("\treturn (long)ret;\n")
1776                         write_c("}\n")
1777                 elif is_union_enum:
1778                     assert(struct_name.endswith("_Tag"))
1779                     struct_name = struct_name[:-4]
1780                     union_enum_items[struct_name] = {"field_lines": field_lines}
1781                 elif struct_name.endswith("_Body") and struct_name.split("_")[0] in union_enum_items:
1782                     enum_var_name = struct_name.split("_")
1783                     union_enum_items[enum_var_name[0]][enum_var_name[1]] = field_lines
1784                 elif struct_name in union_enum_items:
1785                     map_complex_enum(struct_name, union_enum_items[struct_name])
1786                 elif is_unitary_enum:
1787                     map_unitary_enum(struct_name, field_lines)
1788                 elif len(trait_fn_lines) > 0:
1789                     trait_structs.add(struct_name)
1790                     map_trait(struct_name, field_var_lines, trait_fn_lines)
1791                 elif struct_name == "LDKTxOut":
1792                     with open(sys.argv[3] + "/structs/TxOut.java", "w") as out_java_struct:
1793                         out_java_struct.write(hu_struct_file_prefix)
1794                         out_java_struct.write("public class TxOut extends CommonBase{\n")
1795                         out_java_struct.write("\tTxOut(java.lang.Object _dummy, long ptr) { super(ptr); }\n")
1796                         out_java_struct.write("\tlong to_c_ptr() { return 0; }\n")
1797                         # TODO: TxOut body
1798                         out_java_struct.write("}")
1799                 else:
1800                     pass # Everything remaining is a byte[] or some form
1801                 cur_block_obj = None
1802         else:
1803             fn_ptr = fn_ptr_regex.match(line)
1804             fn_ret_arr = fn_ret_arr_regex.match(line)
1805             reg_fn = reg_fn_regex.match(line)
1806             const_val = const_val_regex.match(line)
1807
1808             if line.startswith("#include <"):
1809                 pass
1810             elif line.startswith("/*"):
1811                 #out_java.write("\t" + line)
1812                 if not line.endswith("*/\n"):
1813                     in_block_comment = True
1814             elif line.startswith("typedef enum "):
1815                 cur_block_obj = line
1816             elif line.startswith("typedef struct "):
1817                 cur_block_obj = line
1818             elif line.startswith("typedef union "):
1819                 cur_block_obj = line
1820             elif line.startswith("typedef "):
1821                 alias_match =  struct_alias_regex.match(line)
1822                 if alias_match.group(1) in tuple_types:
1823                     tuple_types[alias_match.group(2)] = (tuple_types[alias_match.group(1)][0], alias_match.group(2))
1824                     tuple_types[alias_match.group(1)] = (tuple_types[alias_match.group(1)][0], alias_match.group(2))
1825                     for idx, ty_info in enumerate(tuple_types[alias_match.group(1)][0]):
1826                         e = chr(ord('a') + idx)
1827                         out_java.write("\tpublic static native " + ty_info.java_ty + " " + alias_match.group(2) + "_get_" + e + "(long ptr);\n")
1828                         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")
1829                         write_c("\t" + alias_match.group(1) + " *tuple = (" + alias_match.group(1) + "*)ptr;\n")
1830                         conv_info = map_type_with_info(ty_info, False, None, False, True)
1831                         if conv_info.ret_conv is not None:
1832                             write_c("\t" + conv_info.ret_conv[0].replace("\n", "\n\t") + "tuple->" + e + conv_info.ret_conv[1].replace("\n", "\n\t") + "\n")
1833                             write_c("\treturn " + conv_info.ret_conv_name + ";\n")
1834                         else:
1835                             write_c("\treturn tuple->" + e + ";\n")
1836                         write_c("}\n")
1837                 elif alias_match.group(1) in result_templ_structs:
1838                     result_types.add(alias_match.group(2))
1839                     human_ty = alias_match.group(2).replace("LDKCResult", "Result")
1840                     with open(sys.argv[3] + "/structs/" + human_ty + ".java", "w") as out_java_struct:
1841                         out_java_struct.write(hu_struct_file_prefix)
1842                         out_java_struct.write("public class " + human_ty + " extends CommonBase {\n")
1843                         out_java_struct.write("\tprivate " + human_ty + "(Object _dummy, long ptr) { super(ptr); }\n")
1844                         out_java_struct.write("\tprotected void finalize() throws Throwable {\n")
1845                         out_java_struct.write("\t\tif (ptr != 0) { bindings." + alias_match.group(2).replace("LDK","") + "_free(ptr); } super.finalize();\n")
1846                         out_java_struct.write("\t}\n\n")
1847                         out_java_struct.write("\tstatic " + human_ty + " constr_from_ptr(long ptr) {\n")
1848                         out_java_struct.write("\t\tif (bindings." + alias_match.group(2) + "_result_ok(ptr)) {\n")
1849                         out_java_struct.write("\t\t\treturn new " + human_ty + "_OK(null, ptr);\n")
1850                         out_java_struct.write("\t\t} else {\n")
1851                         out_java_struct.write("\t\t\treturn new " + human_ty + "_Err(null, ptr);\n")
1852                         out_java_struct.write("\t\t}\n")
1853                         out_java_struct.write("\t}\n")
1854
1855                         contents_ty = alias_match.group(1).replace("LDKCResultTempl", "LDKCResultPtr")
1856                         res_ty, err_ty = result_ptr_struct_items[contents_ty]
1857                         res_map = map_type(res_ty + " res", True, None, False, True)
1858                         err_map = map_type(err_ty + " err", True, None, False, True)
1859
1860                         out_java.write("\tpublic static native boolean " + alias_match.group(2) + "_result_ok(long arg);\n")
1861                         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")
1862                         write_c("\treturn ((" + alias_match.group(2) + "*)arg)->result_ok;\n")
1863                         write_c("}\n")
1864
1865                         out_java.write("\tpublic static native " + res_map.java_ty + " " + alias_match.group(2) + "_get_ok(long arg);\n")
1866                         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")
1867                         write_c("\t" + alias_match.group(2) + " *val = (" + alias_match.group(2) + "*)arg;\n")
1868                         write_c("\tCHECK(val->result_ok);\n\t")
1869                         out_java_struct.write("\tpublic static final class " + human_ty + "_OK extends " + human_ty + " {\n")
1870                         if res_map.ret_conv is not None:
1871                             write_c(res_map.ret_conv[0].replace("\n", "\n\t") + "(*val->contents.result)")
1872                             write_c(res_map.ret_conv[1].replace("\n", "\n\t") + "\n\treturn " + res_map.ret_conv_name)
1873                         else:
1874                             write_c("return *val->contents.result")
1875                         write_c(";\n}\n")
1876
1877                         out_java_struct.write("\t\tpublic final " + res_map.java_hu_ty + " res;\n")
1878                         out_java_struct.write("\t\tprivate " + human_ty + "_OK(Object _dummy, long ptr) {\n")
1879                         out_java_struct.write("\t\t\tsuper(_dummy, ptr);\n")
1880                         if res_map.to_hu_conv is not None:
1881                             out_java_struct.write("\t\t\t" + res_map.java_ty + " res = bindings." + alias_match.group(2) + "_get_ok(ptr);\n")
1882                             out_java_struct.write("\t\t\t" + res_map.to_hu_conv.replace("\n", "\n\t\t\t"))
1883                             out_java_struct.write("\n\t\t\tthis.res = " + res_map.to_hu_conv_name + ";\n")
1884                         else:
1885                             out_java_struct.write("\t\t\tthis.res = bindings." + alias_match.group(2) + "_get_ok(ptr);\n")
1886                         out_java_struct.write("\t\t}\n")
1887                         if alias_match.group(2).startswith("LDKCResult_None"):
1888                             out_java_struct.write("\t\tpublic " + human_ty + "_OK() {\n\t\t\tthis(null, bindings.C" + human_ty + "_ok());\n")
1889                         else:
1890                             out_java_struct.write("\t\tpublic " + human_ty + "_OK(" + res_map.java_hu_ty + " res) {\n")
1891                             if res_map.from_hu_conv is not None:
1892                                 out_java_struct.write("\t\t\tthis(null, bindings.C" + human_ty + "_ok(" + res_map.from_hu_conv[0] + "));\n")
1893                                 if res_map.from_hu_conv[1] != "":
1894                                     out_java_struct.write("\t\t\t" + res_map.from_hu_conv[1] + ";\n")
1895                             else:
1896                                 out_java_struct.write("\t\t\tthis(null, bindings.C" + human_ty + "_ok(res));\n")
1897                         out_java_struct.write("\t\t}\n\t}\n\n")
1898
1899                         out_java.write("\tpublic static native " + err_map.java_ty + " " + alias_match.group(2) + "_get_err(long arg);\n")
1900                         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")
1901                         write_c("\t" + alias_match.group(2) + " *val = (" + alias_match.group(2) + "*)arg;\n")
1902                         write_c("\tCHECK(!val->result_ok);\n\t")
1903                         out_java_struct.write("\tpublic static final class " + human_ty + "_Err extends " + human_ty + " {\n")
1904                         if err_map.ret_conv is not None:
1905                             write_c(err_map.ret_conv[0].replace("\n", "\n\t") + "(*val->contents.err)")
1906                             write_c(err_map.ret_conv[1].replace("\n", "\n\t") + "\n\treturn " + err_map.ret_conv_name)
1907                         else:
1908                             write_c("return *val->contents.err")
1909                         write_c(";\n}\n")
1910
1911                         out_java_struct.write("\t\tpublic final " + err_map.java_hu_ty + " err;\n")
1912                         out_java_struct.write("\t\tprivate " + human_ty + "_Err(Object _dummy, long ptr) {\n")
1913                         out_java_struct.write("\t\t\tsuper(_dummy, ptr);\n")
1914                         if err_map.to_hu_conv is not None:
1915                             out_java_struct.write("\t\t\t" + err_map.java_ty + " err = bindings." + alias_match.group(2) + "_get_err(ptr);\n")
1916                             out_java_struct.write("\t\t\t" + err_map.to_hu_conv.replace("\n", "\n\t\t\t"))
1917                             out_java_struct.write("\n\t\t\tthis.err = " + err_map.to_hu_conv_name + ";\n")
1918                         else:
1919                             out_java_struct.write("\t\t\tthis.err = bindings." + alias_match.group(2) + "_get_err(ptr);\n")
1920                         out_java_struct.write("\t\t}\n")
1921
1922                         if alias_match.group(2).endswith("NoneZ"):
1923                             out_java_struct.write("\t\tpublic " + human_ty + "_Err() {\n\t\t\tthis(null, bindings.C" + human_ty + "_err());\n")
1924                         else:
1925                             out_java_struct.write("\t\tpublic " + human_ty + "_Err(" + err_map.java_hu_ty + " err) {\n")
1926                             if err_map.from_hu_conv is not None:
1927                                 out_java_struct.write("\t\t\tthis(null, bindings.C" + human_ty + "_err(" + err_map.from_hu_conv[0] + "));\n")
1928                                 if err_map.from_hu_conv[1] != "":
1929                                     out_java_struct.write("\t\t\t" + err_map.from_hu_conv[1] + ";\n")
1930                             else:
1931                                 out_java_struct.write("\t\t\tthis(null, bindings.C" + human_ty + "_err(err));\n")
1932                         out_java_struct.write("\t\t}\n\t}\n}\n")
1933             elif fn_ptr is not None:
1934                 map_fn(line, fn_ptr, None, None)
1935             elif fn_ret_arr is not None:
1936                 map_fn(line, fn_ret_arr, fn_ret_arr.group(4), None)
1937             elif reg_fn is not None:
1938                 map_fn(line, reg_fn, None, None)
1939             elif const_val_regex is not None:
1940                 # TODO Map const variables
1941                 pass
1942             else:
1943                 assert(line == "\n")
1944
1945     out_java.write("}\n")
1946     for struct_name in opaque_structs:
1947         with open(sys.argv[3] + "/structs/" + struct_name.replace("LDK","") + ".java", "a") as out_java_struct:
1948             out_java_struct.write("}\n")
1949     for struct_name in trait_structs:
1950         with open(sys.argv[3] + "/structs/" + struct_name.replace("LDK","") + ".java", "a") as out_java_struct:
1951             out_java_struct.write("}\n")
1952 with open(sys.argv[4], "w") as out_c:
1953     out_c.write(c_file_pfx)
1954     for ty in c_array_class_caches:
1955         if ty + "_clz" in c_file:
1956             out_c.write("static jclass " + ty + "_clz = NULL;\n")
1957     out_c.write("JNIEXPORT void Java_org_ldk_impl_bindings_init_1class_1cache(JNIEnv * env, jclass _b) {\n")
1958     for ty in c_array_class_caches:
1959         if ty + "_clz" in c_file:
1960             out_c.write("\t" + ty + "_clz = (*env)->FindClass(env, \"" + ty.replace("arr_of_", "[") + "\");\n")
1961             out_c.write("\tCHECK(" + ty + "_clz != NULL);\n")
1962             out_c.write("\t" + ty + "_clz = (*env)->NewGlobalRef(env, " + ty + "_clz);\n")
1963     out_c.write("}\n")
1964     out_c.write(c_file)