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

   1 from bindingstypes import *
   2 from enum import Enum
   3 import sys
   4
   5 class Target(Enum):
   6     CSHARP = 1,
   7
   8 class Consts:
   9     def __init__(self, DEBUG: bool, target: Target, **kwargs):
  10         self.target = target
  11         self.c_array_class_caches = set()
  12         self.c_type_map = dict(
  13             bool = ['bool'],
  14             uint8_t = ['byte'],
  15             uint16_t = ['short'],
  16             uint32_t = ['int'],
  17             uint64_t = ['long'],
  18             int64_t = ['long'],
  19         )
  20         self.java_type_map = dict(
  21             String = "string"
  22         )
  23         self.java_hu_type_map = dict(
  24             String = "string"
  25         )
  26
  27         self.to_hu_conv_templates = dict(
  28             ptr = '{human_type} {var_name}_hu_conv = null; if ({var_name} < 0 || {var_name} > 4096) { {var_name}_hu_conv = new {human_type}(null, {var_name}); }',
  29             default = '{human_type} {var_name}_hu_conv = null; if ({var_name} < 0 || {var_name} > 4096) { {var_name}_hu_conv = new {human_type}(null, {var_name}); }'
  30         )
  31
  32         self.bindings_header = """
  33 using org.ldk.enums;
  34 using org.ldk.impl;
  35 using System.Runtime.InteropServices;
  36
  37 namespace org { namespace ldk { namespace impl {
  38
  39 internal class bindings {
  40         /*static {
  41                 init(java.lang.Enum.class, VecOrSliceDef.class);
  42                 init_class_cache();
  43                 if (!get_lib_version_string().equals(version.get_ldk_java_bindings_version()))
  44                         throw new ArgumentException("Compiled LDK library and LDK class failes do not match");
  45                 // Fetching the LDK versions from C also checks that the header and binaries match
  46                 Console.Error.WriteLine("Loaded LDK-Java Bindings " + version.get_ldk_java_bindings_version() + " with LDK " + get_ldk_version() + " and LDK-C-Bindings " + get_ldk_c_bindings_version());
  47         }*/
  48         //static extern void init(java.lang.Class c);
  49         //static native void init_class_cache();
  50 """
  51         self.bindings_header += self.native_meth_decl("get_lib_version_string", "string") + "();\n"
  52         self.bindings_header += self.native_meth_decl("get_ldk_c_bindings_version", "string") + "();\n"
  53         self.bindings_header += self.native_meth_decl("get_ldk_version", "string") + "();\n\n"
  54
  55         self.bindings_version_file = """
  56
  57 public class version {
  58         public static string get_ldk_java_bindings_version() {
  59                 return "<git_version_ldk_garbagecollected>";
  60         }
  61 }"""
  62
  63         self.util_fn_pfx = """using org.ldk.impl;
  64 using org.ldk.enums;
  65 using org.ldk.util;
  66 using org.ldk.structs;
  67 using System;
  68
  69 namespace org { namespace ldk { namespace util {
  70 public class UtilMethods {
  71 """
  72         self.util_fn_sfx = "} } } }"
  73         self.common_base = """using System.Collections.Generic;
  74 using System.Diagnostics;
  75
  76 public class CommonBase {
  77         protected internal long ptr;
  78         protected internal LinkedList<object> ptrs_to = new LinkedList<object>();
  79         protected CommonBase(long ptr) { Trace.Assert(ptr < 0 || ptr > 4096); this.ptr = ptr; }
  80 }
  81 """
  82
  83         self.txin_defn = """public class TxIn : CommonBase {
  84         /** The witness in this input, in serialized form */
  85         public readonly byte[] witness;
  86         /** The script_sig in this input */
  87         public readonly byte[] script_sig;
  88         /** The transaction output's sequence number */
  89         public readonly int sequence;
  90         /** The txid this input is spending */
  91         public readonly byte[] previous_txid;
  92         /** The output index within the spent transaction of the output this input is spending */
  93         public readonly int previous_vout;
  94
  95         internal TxIn(object _dummy, long ptr) : base(ptr) {
  96                 this.witness = bindings.TxIn_get_witness(ptr);
  97                 this.script_sig = bindings.TxIn_get_script_sig(ptr);
  98                 this.sequence = bindings.TxIn_get_sequence(ptr);
  99                 this.previous_txid = bindings.TxIn_get_previous_txid(ptr);
 100                 this.previous_vout = bindings.TxIn_get_previous_vout(ptr);
 101         }
 102         public TxIn(byte[] witness, byte[] script_sig, int sequence, byte[] previous_txid, int previous_vout)
 103         : this(null, bindings.TxIn_new(witness, script_sig, sequence, previous_txid, previous_vout)) {}
 104
 105         ~TxIn() {
 106                 if (ptr != 0) { bindings.TxIn_free(ptr); }
 107         }
 108 }"""
 109
 110         self.txout_defn = """public class TxOut : CommonBase {
 111         /** The script_pubkey in this output */
 112         public readonly byte[] script_pubkey;
 113         /** The value, in satoshis, of this output */
 114         public readonly long value;
 115
 116     internal TxOut(object _dummy, long ptr) : base(ptr) {
 117                 this.script_pubkey = bindings.TxOut_get_script_pubkey(ptr);
 118                 this.value = bindings.TxOut_get_value(ptr);
 119         }
 120     public TxOut(long value, byte[] script_pubkey) : this(null, bindings.TxOut_new(script_pubkey, value)) {}
 121
 122         ~TxOut() {
 123                 if (ptr != 0) { bindings.TxOut_free(ptr); }
 124         }
 125 }"""
 126
 127         self.scalar_defn = """public class BigEndianScalar : CommonBase {
 128         /** The bytes of the scalar value, in big endian */
 129         public readonly byte[] scalar_bytes;
 130
 131     internal BigEndianScalar(object _dummy, long ptr) : base(ptr) {
 132                 this.scalar_bytes = bindings.BigEndianScalar_get_bytes(ptr);
 133         }
 134     public BigEndianScalar(byte[] scalar_bytes) : base(bindings.BigEndianScalar_new(scalar_bytes)) {
 135                 this.scalar_bytes = bindings.BigEndianScalar_get_bytes(ptr);
 136         }
 137
 138         ~BigEndianScalar() {
 139                 if (ptr != 0) { bindings.BigEndianScalar_free(ptr); }
 140         }
 141 }"""
 142
 143
 144         self.c_file_pfx = """
 145 // On OSX jlong (ie long long) is not equivalent to int64_t, so we override here
 146 #define int64_t jlong
 147 #include <lightning.h>
 148 #include <string.h>
 149 #include <stdatomic.h>
 150 #include <stdlib.h>
 151
 152 #define LIKELY(v) __builtin_expect(!!(v), 1)
 153 #define UNLIKELY(v) __builtin_expect(!!(v), 0)
 154
 155 """
 156
 157         self.c_file_pfx = self.c_file_pfx + "#include <stdio.h>\n#define DEBUG_PRINT(...) fprintf(stderr, __VA_ARGS__)\n"
 158
 159         if not DEBUG or sys.platform == "darwin":
 160             self.c_file_pfx = self.c_file_pfx + """#define MALLOC(a, _) malloc(a)
 161 #define FREE(p) if ((uint64_t)(p) > 4096) { free(p); }
 162 #define CHECK_ACCESS(p)
 163 #define CHECK_INNER_FIELD_ACCESS_OR_NULL(v)
 164 """
 165         if not DEBUG:
 166             self.c_file_pfx += """#define DO_ASSERT(a) (void)(a)
 167 #define CHECK(a)
 168 """
 169         if DEBUG:
 170             self.c_file_pfx = self.c_file_pfx + """#include <assert.h>
 171 // Always run a, then assert it is true:
 172 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
 173 // Assert a is true or do nothing
 174 #define CHECK(a) DO_ASSERT(a)
 175
 176 void __attribute__((constructor)) debug_log_version() {
 177         if (check_get_ldk_version() == NULL)
 178                 DEBUG_PRINT("LDK version did not match the header we built against\\n");
 179         if (check_get_ldk_bindings_version() == NULL)
 180                 DEBUG_PRINT("LDK C Bindings version did not match the header we built against\\n");
 181 }
 182 """
 183
 184             if sys.platform != "darwin":
 185                 self.c_file_pfx += """
 186 // Running a leak check across all the allocations and frees of the JDK is a mess,
 187 // so instead we implement our own naive leak checker here, relying on the -wrap
 188 // linker option to wrap malloc/calloc/realloc/free, tracking everyhing allocated
 189 // and free'd in Rust or C across the generated bindings shared library.
 190 #include <threads.h>
 191 """
 192
 193                 self.c_file_pfx = self.c_file_pfx + "#include <execinfo.h>\n"
 194                 self.c_file_pfx = self.c_file_pfx + """
 195 #include <unistd.h>
 196 #include <pthread.h>
 197 static pthread_mutex_t allocation_mtx;
 198
 199 void __attribute__((constructor)) init_mtx() {
 200         DO_ASSERT(!pthread_mutex_init(&allocation_mtx, NULL));
 201 }
 202
 203 #define BT_MAX 128
 204 typedef struct allocation {
 205         struct allocation* next;
 206         void* ptr;
 207         const char* struct_name;
 208         void* bt[BT_MAX];
 209         int bt_len;
 210         unsigned long alloc_len;
 211 } allocation;
 212 static allocation* allocation_ll = NULL;
 213
 214 void* __real_malloc(size_t len);
 215 void* __real_calloc(size_t nmemb, size_t len);
 216 static void new_allocation(void* res, const char* struct_name, size_t len) {
 217         allocation* new_alloc = __real_malloc(sizeof(allocation));
 218         new_alloc->ptr = res;
 219         new_alloc->struct_name = struct_name;
 220         new_alloc->bt_len = backtrace(new_alloc->bt, BT_MAX);
 221         new_alloc->alloc_len = len;
 222         DO_ASSERT(!pthread_mutex_lock(&allocation_mtx));
 223         new_alloc->next = allocation_ll;
 224         allocation_ll = new_alloc;
 225         DO_ASSERT(!pthread_mutex_unlock(&allocation_mtx));
 226 }
 227 static void* MALLOC(size_t len, const char* struct_name) {
 228         void* res = __real_malloc(len);
 229         new_allocation(res, struct_name, len);
 230         return res;
 231 }
 232 void __real_free(void* ptr);
 233 static void alloc_freed(void* ptr) {
 234         allocation* p = NULL;
 235         DO_ASSERT(!pthread_mutex_lock(&allocation_mtx));
 236         allocation* it = allocation_ll;
 237         while (it->ptr != ptr) {
 238                 p = it; it = it->next;
 239                 if (it == NULL) {
 240                         DEBUG_PRINT("ERROR: Tried to free unknown pointer %p at:\\n", ptr);
 241                         void* bt[BT_MAX];
 242                         int bt_len = backtrace(bt, BT_MAX);
 243                         backtrace_symbols_fd(bt, bt_len, STDERR_FILENO);
 244                         DEBUG_PRINT("\\n\\n");
 245                         DO_ASSERT(!pthread_mutex_unlock(&allocation_mtx));
 246                         return; // addrsan should catch malloc-unknown and print more info than we have
 247                 }
 248         }
 249         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
 250         DO_ASSERT(!pthread_mutex_unlock(&allocation_mtx));
 251         DO_ASSERT(it->ptr == ptr);
 252         __real_free(it);
 253 }
 254 static void FREE(void* ptr) {
 255         if ((uint64_t)ptr <= 4096) return; // Rust loves to create pointers to the NULL page for dummys
 256         alloc_freed(ptr);
 257         __real_free(ptr);
 258 }
 259
 260 void* __wrap_malloc(size_t len) {
 261         void* res = __real_malloc(len);
 262         new_allocation(res, "malloc call", len);
 263         return res;
 264 }
 265 void* __wrap_calloc(size_t nmemb, size_t len) {
 266         void* res = __real_calloc(nmemb, len);
 267         new_allocation(res, "calloc call", len);
 268         return res;
 269 }
 270 void __wrap_free(void* ptr) {
 271         if (ptr == NULL) return;
 272         alloc_freed(ptr);
 273         __real_free(ptr);
 274 }
 275
 276 static void CHECK_ACCESS(const void* ptr) {
 277         DO_ASSERT(!pthread_mutex_lock(&allocation_mtx));
 278         allocation* it = allocation_ll;
 279         while (it->ptr != ptr) {
 280                 it = it->next;
 281                 if (it == NULL) {
 282                         DEBUG_PRINT("ERROR: Tried to access unknown pointer %p at:\\n", ptr);
 283                         void* bt[BT_MAX];
 284                         int bt_len = backtrace(bt, BT_MAX);
 285                         backtrace_symbols_fd(bt, bt_len, STDERR_FILENO);
 286                         DEBUG_PRINT("\\n\\n");
 287                         DO_ASSERT(!pthread_mutex_unlock(&allocation_mtx));
 288                         return; // addrsan should catch and print more info than we have
 289                 }
 290         }
 291         DO_ASSERT(!pthread_mutex_unlock(&allocation_mtx));
 292 }
 293 #define CHECK_INNER_FIELD_ACCESS_OR_NULL(v) \\
 294         if (v.is_owned && v.inner != NULL) { \\
 295                 const void *p = __unmangle_inner_ptr(v.inner); \\
 296                 if (p != NULL) { \\
 297                         CHECK_ACCESS(p); \\
 298                 } \\
 299         }
 300
 301 void* __real_realloc(void* ptr, size_t newlen);
 302 void* __wrap_realloc(void* ptr, size_t len) {
 303         if (ptr != NULL) alloc_freed(ptr);
 304         void* res = __real_realloc(ptr, len);
 305         new_allocation(res, "realloc call", len);
 306         return res;
 307 }
 308 void __wrap_reallocarray(void* ptr, size_t new_sz) {
 309         // Rust doesn't seem to use reallocarray currently
 310         DO_ASSERT(false);
 311 }
 312
 313 void __attribute__((destructor)) check_leaks() {
 314         unsigned long alloc_count = 0;
 315         unsigned long alloc_size = 0;
 316         DEBUG_PRINT("The following LDK-allocated blocks still remain.\\n");
 317         DEBUG_PRINT("Note that this is only accurate if System.gc(); System.runFinalization()\\n");
 318         DEBUG_PRINT("was called prior to exit after all LDK objects were out of scope.\\n");
 319         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 320                 DEBUG_PRINT("%s %p (%lu bytes) remains:\\n", a->struct_name, a->ptr, a->alloc_len);
 321                 backtrace_symbols_fd(a->bt, a->bt_len, STDERR_FILENO);
 322                 DEBUG_PRINT("\\n\\n");
 323                 alloc_count++;
 324                 alloc_size += a->alloc_len;
 325         }
 326         DEBUG_PRINT("%lu allocations remained for %lu bytes.\\n", alloc_count, alloc_size);
 327         DEBUG_PRINT("Note that this is only accurate if System.gc(); System.runFinalization()\\n");
 328         DEBUG_PRINT("was called prior to exit after all LDK objects were out of scope.\\n");
 329 }
 330 """
 331         self.c_file_pfx = self.c_file_pfx + """
 332
 333 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
 334 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
 335 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
 336 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
 337
 338 _Static_assert(sizeof(void*) <= 8, "Pointers must fit into 64 bits");
 339
 340 typedef jlongArray int64_tArray;
 341 typedef jbyteArray int8_tArray;
 342
 343 static inline jstring str_ref_to_java(JNIEnv *env, const char* chars, size_t len) {
 344         // Sadly we need to create a temporary because Java can't accept a char* without a 0-terminator
 345         char* conv_buf = MALLOC(len + 1, "str conv buf");
 346         memcpy(conv_buf, chars, len);
 347         conv_buf[len] = 0;
 348         jstring ret = (*env)->NewStringUTF(env, conv_buf);
 349         FREE(conv_buf);
 350         return ret;
 351 }
 352 static inline LDKStr java_to_owned_str(JNIEnv *env, jstring str) {
 353         uint64_t str_len = (*env)->GetStringUTFLength(env, str);
 354         char* newchars = MALLOC(str_len + 1, "String chars");
 355         const char* jchars = (*env)->GetStringUTFChars(env, str, NULL);
 356         memcpy(newchars, jchars, str_len);
 357         newchars[str_len] = 0;
 358         (*env)->ReleaseStringUTFChars(env, str, jchars);
 359         LDKStr res = {
 360                 .chars = newchars,
 361                 .len = str_len,
 362                 .chars_is_owned = true
 363         };
 364         return res;
 365 }
 366
 367 const char* CS_LDK_get_ldk_c_bindings_version() {
 368         return str_ref_to_java(check_get_ldk_bindings_version(), strlen(check_get_ldk_bindings_version()));
 369 }
 370 const char* CS_LDK_get_ldk_version() {
 371         return str_ref_to_java(check_get_ldk_version(), strlen(check_get_ldk_version()));
 372 }
 373 #include "version.c"
 374 """
 375         self.c_version_file = """const char* CS_LDK_get_lib_version_string() {
 376         return "<git_version_ldk_garbagecollected>";
 377 }"""
 378
 379         self.hu_struct_file_prefix = """using org.ldk.impl;
 380 using org.ldk.enums;
 381 using org.ldk.util;
 382 using System;
 383
 384 namespace org { namespace ldk { namespace structs {
 385
 386 """
 387         self.hu_struct_file_suffix = "} } }\n"
 388         self.c_fn_args_pfx = ""
 389         self.c_fn_ty_pfx = ""
 390         self.file_ext = ".cs"
 391         self.ptr_c_ty = "int64_t"
 392         self.ptr_native_ty = "long"
 393         self.u128_native_ty = "UInt128"
 394         self.usize_c_ty = "int64_t"
 395         self.usize_native_ty = "long"
 396         self.native_zero_ptr = "0"
 397         self.result_c_ty = "jclass"
 398         self.ptr_arr = "jobjectArray"
 399         self.is_arr_some_check = ("", " != NULL")
 400         self.get_native_arr_len_call = ("(*env)->GetArrayLength(env, ", ")")
 401
 402         self.bindings_footer_wip = "\tstatic bindings() {\n"
 403     def bindings_footer(self):
 404         return self.bindings_footer_wip + "\t}\n}\n} } }\n"
 405
 406     def native_meth_decl(self, meth_name, ret_ty_str):
 407         return "\t[DllImport (\"ldkcsharp\", EntryPoint=\"CS_LDK_" + meth_name + "\")] public static extern " + ret_ty_str + " " + meth_name
 408
 409     def c_fn_name_define_pfx(self, fn_name, have_args):
 410         return " CS_LDK_" + fn_name + "("
 411
 412     def construct_jenv(self):
 413         res =  "JNIEnv *env;\n"
 414         res += "jint get_jenv_res = (*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_6);\n"
 415         res += "if (get_jenv_res == JNI_EDETACHED) {\n"
 416         res += "\tDO_ASSERT((*j_calls->vm)->AttachCurrentThread(j_calls->vm, (void**)&env, NULL) == JNI_OK);\n"
 417         res += "} else {\n"
 418         res += "\tDO_ASSERT(get_jenv_res == JNI_OK);\n"
 419         res += "}\n"
 420         return res
 421     def deconstruct_jenv(self):
 422         res = "if (get_jenv_res == JNI_EDETACHED) {\n"
 423         res += "\tDO_ASSERT((*j_calls->vm)->DetachCurrentThread(j_calls->vm) == JNI_OK);\n"
 424         res += "}\n"
 425         return res
 426
 427     def release_native_arr_ptr_call(self, ty_info, arr_var, arr_ptr_var):
 428         if ty_info.subty is None or not ty_info.subty.c_ty.endswith("Array"):
 429             return "(*env)->ReleasePrimitiveArrayCritical(env, " + arr_var + ", " + arr_ptr_var + ", 0)"
 430         return None
 431     def create_native_arr_call(self, arr_len, ty_info):
 432         if ty_info.c_ty == "int8_tArray":
 433             return "(*env)->NewByteArray(env, " + arr_len + ")"
 434         elif ty_info.subty.c_ty.endswith("Array"):
 435             clz_var = ty_info.java_fn_ty_arg[1:].replace("[", "arr_of_")
 436             self.c_array_class_caches.add(clz_var)
 437             return "(*env)->NewObjectArray(env, " + arr_len + ", " + clz_var + "_clz, NULL);\n"
 438         else:
 439             return "(*env)->New" + ty_info.java_ty.strip("[]").title() + "Array(env, " + arr_len + ")"
 440     def set_native_arr_contents(self, arr_name, arr_len, ty_info):
 441         if ty_info.c_ty == "int8_tArray":
 442             return ("(*env)->SetByteArrayRegion(env, " + arr_name + ", 0, " + arr_len + ", ", ")")
 443         elif ty_info.c_ty == "int16_tArray":
 444             return ("(*env)->SetByteArrayRegion(env, " + arr_name + ", 0, " + arr_len + ", ", ")")
 445         else:
 446             assert False
 447     def get_native_arr_contents(self, arr_name, dest_name, arr_len, ty_info, copy):
 448         if ty_info.c_ty == "int8_tArray":
 449             if copy:
 450                 return "(*env)->GetByteArrayRegion(env, " + arr_name + ", 0, " + arr_len + ", " + dest_name + ")"
 451             else:
 452                 return "(*env)->GetByteArrayElements (env, " + arr_name + ", NULL)"
 453         elif not ty_info.java_ty[:len(ty_info.java_ty) - 2].endswith("[]"):
 454             return "(*env)->Get" + ty_info.subty.java_ty.title() + "ArrayElements (env, " + arr_name + ", NULL)"
 455         else:
 456             return None
 457     def get_native_arr_elem(self, arr_name, idxc, ty_info):
 458         if self.get_native_arr_contents(arr_name, "", "", ty_info, False) is None:
 459             return "(*env)->GetObjectArrayElement(env, " + arr_name + ", " + idxc + ")"
 460         else:
 461             assert False # Only called if above is None
 462     def get_native_arr_ptr_call(self, ty_info):
 463         if ty_info.subty is not None and ty_info.subty.c_ty.endswith("Array"):
 464             return None
 465         return ("(*env)->GetPrimitiveArrayCritical(env, ", ", NULL)")
 466     def get_native_arr_entry_call(self, ty_info, arr_name, idxc, entry_access):
 467         if ty_info.subty is None or not ty_info.subty.c_ty.endswith("Array"):
 468             return None
 469         return "(*env)->SetObjectArrayElement(env, " + arr_name + ", " + idxc + ", " + entry_access + ")"
 470     def cleanup_native_arr_ref_contents(self, arr_name, dest_name, arr_len, ty_info):
 471         if ty_info.c_ty == "int8_tArray":
 472             return "(*env)->ReleaseByteArrayElements(env, " + arr_name + ", (int8_t*)" + dest_name + ", 0);"
 473         else:
 474             return "(*env)->Release" + ty_info.java_ty.strip("[]").title() + "ArrayElements(env, " + arr_name + ", " + dest_name + ", 0)"
 475
 476     def map_hu_array_elems(self, arr_name, conv_name, arr_ty, elem_ty):
 477         if elem_ty.java_hu_ty == "UInt5":
 478             return arr_name + " != null ? InternalUtils.convUInt5Array(" + arr_name + ") : null"
 479         elif elem_ty.java_hu_ty == "WitnessVersion":
 480             return arr_name + " != null ? InternalUtils.convWitnessVersionArray(" + arr_name + ") : null"
 481         else:
 482             return arr_name + " != null ? InternalUtils.mapArray(" + arr_name + ", " + conv_name + " => " + elem_ty.from_hu_conv[0] + ") : null"
 483
 484     def str_ref_to_native_call(self, var_name, str_len):
 485         return "str_ref_to_java(env, " + var_name + ", " + str_len + ")"
 486     def str_ref_to_c_call(self, var_name):
 487         return "java_to_owned_str(env, " + var_name + ")"
 488     def str_to_hu_conv(self, var_name):
 489         return None
 490     def str_from_hu_conv(self, var_name):
 491         return None
 492
 493     def init_str(self):
 494         return ""
 495
 496     def var_decl_statement(self, ty_string, var_name, statement):
 497         return ty_string + " " + var_name + " = " + statement
 498
 499     def get_java_arr_len(self, arr_name):
 500         return arr_name + ".Length"
 501     def get_java_arr_elem(self, elem_ty, arr_name, idx):
 502         return arr_name + "[" + idx + "]"
 503     def constr_hu_array(self, ty_info, arr_len):
 504         base_ty = ty_info.subty.java_hu_ty.split("[")[0].split("<")[0]
 505         conv = "new " + base_ty + "[" + arr_len + "]"
 506         if "[" in ty_info.subty.java_hu_ty.split("<")[0]:
 507             # Do a bit of a dance to move any excess [] to the end
 508             conv += "[" + ty_info.subty.java_hu_ty.split("<")[0].split("[")[1]
 509         return conv
 510     def cleanup_converted_native_array(self, ty_info, arr_name):
 511         return None
 512
 513     def primitive_arr_from_hu(self, arr_ty, fixed_len, arr_name):
 514         mapped_ty = arr_ty.subty
 515         if arr_ty.rust_obj == "LDKU128":
 516             return ("" + arr_name + ".getLEBytes()", "")
 517         if fixed_len is not None:
 518             return ("InternalUtils.check_arr_len(" + arr_name + ", " + fixed_len + ")", "")
 519         return None
 520     def primitive_arr_to_hu(self, arr_ty, fixed_len, arr_name, conv_name):
 521         if arr_ty.rust_obj == "LDKU128":
 522             return "org.ldk.util.UInt128 " + conv_name + " = new org.ldk.util.UInt128(" + arr_name + ");"
 523         return None
 524
 525     def java_arr_ty_str(self, elem_ty_str):
 526         return elem_ty_str + "[]"
 527
 528     def for_n_in_range(self, n, minimum, maximum):
 529         return "for (int " + n + " = " + minimum + "; " + n + " < " + maximum + "; " + n + "++) {"
 530     def for_n_in_arr(self, n, arr_name, arr_elem_ty):
 531         return ("foreach (" + arr_elem_ty.java_hu_ty + " " + n + " in " + arr_name + ") { ", " }")
 532
 533     def get_ptr(self, var):
 534         return var + ".ptr"
 535     def set_null_skip_free(self, var):
 536         return var + ".ptr" + " = 0;"
 537
 538     def add_ref(self, holder, referent):
 539         return "if (" + holder + " != null) { " + holder + ".ptrs_to.AddLast(" + referent + "); }"
 540
 541     def fully_qualified_hu_ty_path(self, ty):
 542         if ty.java_fn_ty_arg.startswith("L") and ty.java_fn_ty_arg.endswith(";"):
 543             return ty.java_hu_ty
 544         if ty.java_hu_ty == "UnqualifiedError" or ty.java_hu_ty == "UInt128" or ty.java_hu_ty == "UInt5" or ty.java_hu_ty == "WitnessVersion":
 545             return "org.ldk.util." + ty.java_hu_ty
 546         if not ty.is_native_primitive and ty.rust_obj is not None and not "[]" in ty.java_hu_ty:
 547             return "org.ldk.structs." + ty.java_hu_ty
 548         return ty.java_hu_ty
 549
 550     def native_c_unitary_enum_map(self, struct_name, variants, enum_doc_comment):
 551         out_java_enum = "namespace org { namespace ldk { namespace enums {"
 552         out_java = ""
 553         out_c = ""
 554
 555         out_c = "static inline LDK" + struct_name + " LDK" + struct_name + "_from_cs(int32_t ord) {\n"
 556         out_c += "\tswitch (ord) {\n"
 557
 558         if enum_doc_comment is not None:
 559             out_java_enum += "/**\n * " + enum_doc_comment.replace("\n", "\n * ") + "\n */\n"
 560         out_java_enum += "public enum " + struct_name + " {\n"
 561         ord_v = 0
 562         for var, var_docs in variants:
 563             if var_docs is not None:
 564                 out_java_enum += "\t/**\n\t * " + var_docs.replace("\n", "\n\t * ") + "\n\t */\n"
 565             out_java_enum += "\t" + var + ",\n"
 566             out_c = out_c + "\t\tcase %d: return %s;\n" % (ord_v, var)
 567             ord_v = ord_v + 1
 568         out_java_enum += "}"
 569         out_c += "\t\tdefault: abort();\n"
 570         out_c += "\t}\n"
 571         out_c += "}\n"
 572
 573         out_c = out_c + "static inline int32_t LDK" + struct_name + "_to_cs(LDK" + struct_name + " val) {\n"
 574         out_c = out_c + "\tswitch (val) {\n"
 575         ord_v = 0
 576         for var, _ in variants:
 577             out_c = out_c + "\t\tcase " + var + ": return %d;\n" % ord_v
 578             ord_v = ord_v + 1
 579         out_c = out_c + "\t\tdefault: abort();\n"
 580         out_c = out_c + "\t}\n"
 581         out_c = out_c + "}\n"
 582
 583         return (out_c, out_java_enum + "} } }\n", out_java)
 584
 585     def c_unitary_enum_to_native_call(self, ty_info):
 586         return (ty_info.rust_obj + "_to_cs(", ")")
 587     def native_unitary_enum_to_c_call(self, ty_info):
 588         return (ty_info.rust_obj + "_from_cs(", ")")
 589
 590     def c_complex_enum_pfx(self, struct_name, variants, init_meth_jty_strs):
 591         out_c = ""
 592         for var in variants:
 593             out_c = out_c + "static jclass " + struct_name + "_" + var + "_class = NULL;\n"
 594             out_c = out_c + "static jmethodID " + struct_name + "_" + var + "_meth = NULL;\n"
 595         out_c += "void" + self.c_fn_name_define_pfx(struct_name.replace("_", "_1") + "_init", True) + self.c_fn_args_pfx + ") {\n"
 596         for var_name in variants:
 597             out_c += "\t" + struct_name + "_" + var_name + "_class =\n"
 598             out_c += "\t\t(*env)->NewGlobalRef(env, (*env)->FindClass(env, \"org/ldk/impl/bindings$" + struct_name + "$" + var_name + "\"));\n"
 599             out_c += "\tCHECK(" + struct_name + "_" + var_name + "_class != NULL);\n"
 600             out_c += "\t" + struct_name + "_" + var_name + "_meth = (*env)->GetMethodID(env, " + struct_name + "_" + var_name + "_class, \"<init>\", \"(" + init_meth_jty_strs[var_name] + ")V\");\n"
 601             out_c += "\tCHECK(" + struct_name + "_" + var_name + "_meth != NULL);\n"
 602         out_c = out_c + "}\n"
 603         return out_c
 604
 605     def c_complex_enum_pass_ty(self, struct_name):
 606         return "jobject"
 607
 608     def c_constr_native_complex_enum(self, struct_name, variant, c_params):
 609         ret = "(*env)->NewObject(env, " + struct_name + "_" + variant + "_class, " + struct_name + "_" + variant + "_meth"
 610         for param in c_params:
 611             ret = ret + ", " + param
 612         return ret + ")"
 613
 614     def native_c_map_trait(self, struct_name, field_vars, flattened_field_vars, field_fns, trait_doc_comment):
 615         out_java_trait = ""
 616         out_java = ""
 617
 618         # First generate most of the Java code, note that we need information about java method argument strings for C
 619         out_java_trait += self.hu_struct_file_prefix
 620         if trait_doc_comment is not None:
 621             out_java_trait += "/**\n * " + trait_doc_comment.replace("\n", "\n * ") + "\n */\n"
 622         out_java_trait = out_java_trait + "public class " + struct_name.replace("LDK","") + " : CommonBase {\n"
 623         out_java_trait = out_java_trait + "\tinternal readonly bindings." + struct_name + " bindings_instance;\n"
 624         out_java_trait = out_java_trait + "\tinternal " + struct_name.replace("LDK", "") + "(object _dummy, long ptr) : base(ptr) { bindings_instance = null; }\n"
 625         out_java_trait = out_java_trait + "\tprivate " + struct_name.replace("LDK", "") + "(bindings." + struct_name + " arg"
 626         for var in flattened_field_vars:
 627             if isinstance(var, ConvInfo):
 628                 out_java_trait += ", " + var.java_hu_ty + " " + var.arg_name
 629             else:
 630                 out_java_trait += ", bindings." + var[0] + " " + var[1]
 631         out_java_trait += ") : base(bindings." + struct_name + "_new(arg"
 632         for var in flattened_field_vars:
 633             if isinstance(var, ConvInfo):
 634                 if var.from_hu_conv is not None:
 635                     out_java_trait = out_java_trait + ", " + var.from_hu_conv[0]
 636                 else:
 637                     out_java_trait = out_java_trait + ", " + var.arg_name
 638             else:
 639                 out_java_trait = out_java_trait + ", " + var[1]
 640         out_java_trait = out_java_trait + ")) {\n"
 641         out_java_trait = out_java_trait + "\t\tthis.ptrs_to.AddLast(arg);\n"
 642         for var in flattened_field_vars:
 643             if isinstance(var, ConvInfo):
 644                 if var.from_hu_conv is not None and var.from_hu_conv[1] != "":
 645                     out_java_trait = out_java_trait + "\t\t" + var.from_hu_conv[1].replace("\n", "\n\t\t") + ";\n"
 646             else:
 647                 out_java_trait = out_java_trait + "\t\tthis.ptrs_to.AddLast(" + var[1] + ");\n"
 648         out_java_trait = out_java_trait + "\t\tthis.bindings_instance = arg;\n"
 649         out_java_trait = out_java_trait + "\t}\n"
 650         out_java_trait = out_java_trait + "\t~" + struct_name.replace("LDK","") + "() {\n"
 651         out_java_trait = out_java_trait + "\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); }\n"
 652         out_java_trait = out_java_trait + "\t}\n\n"
 653
 654         java_trait_wrapper = "\tprivate class " + struct_name + "Holder { internal " + struct_name.replace("LDK", "") + " held; }\n"
 655         java_trait_wrapper += "\tprivate class " + struct_name + "Impl : bindings." + struct_name + " {\n"
 656         java_trait_wrapper += "\t\tinternal " + struct_name + "Impl(" + struct_name.replace("LDK", "") + "Interface arg, " + struct_name + "Holder impl_holder) { this.arg = arg; this.impl_holder = impl_holder; }\n"
 657         java_trait_wrapper += "\t\tprivate " + struct_name.replace("LDK", "") + "Interface arg;\n"
 658         java_trait_wrapper += "\t\tprivate " + struct_name + "Holder impl_holder;\n"
 659         java_trait_constr = "\tpublic static " + struct_name.replace("LDK", "") + " new_impl(" + struct_name.replace("LDK", "") + "Interface arg"
 660         for var in flattened_field_vars:
 661             if isinstance(var, ConvInfo):
 662                 java_trait_constr += ", " + var.java_hu_ty + " " + var.arg_name
 663             else:
 664                 # Ideally we'd be able to take any instance of the interface, but our C code can only represent
 665                 # Java-implemented version, so we require users pass a Java implementation here :/
 666                 java_trait_constr += ", " + var[0].replace("LDK", "") + "." + var[0].replace("LDK", "") + "Interface " + var[1] + "_impl"
 667         java_trait_constr = java_trait_constr + ") {\n\t\t" + struct_name + "Holder impl_holder = new " + struct_name + "Holder();\n"
 668         java_trait_constr = java_trait_constr + "\t\timpl_holder.held = new " + struct_name.replace("LDK", "") + "(new " + struct_name + "Impl(arg, impl_holder)"
 669         out_java_trait += "\tpublic interface " + struct_name.replace("LDK", "") + "Interface {\n"
 670         out_java += "\tpublic interface " + struct_name + " {\n"
 671         java_meths = []
 672         for fn_line in field_fns:
 673             java_meth_descr = "("
 674             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 675                 fn_name = fn_line.fn_name
 676                 if fn_name == "lock": # reserved symbol
 677                     fn_name = "do_lock"
 678                 out_java += "\t\t" + fn_line.ret_ty_info.java_ty + " " + fn_name + "("
 679                 java_trait_wrapper += "\t\tpublic " + fn_line.ret_ty_info.java_ty + " " + fn_name + "("
 680                 out_java_trait += "\t\t/**\n\t\t * " + fn_line.docs.replace("\n", "\n\t\t * ") + "\n\t\t */\n"
 681                 out_java_trait += "\t\t" + fn_line.ret_ty_info.java_hu_ty + " " + fn_name + "("
 682
 683                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 684                     if idx >= 1:
 685                         out_java += ", "
 686                         java_trait_wrapper += ", "
 687                         out_java_trait += ", "
 688                     out_java += arg_conv_info.java_ty + " _" + arg_conv_info.arg_name
 689                     out_java_trait += arg_conv_info.java_hu_ty + " _" + arg_conv_info.arg_name
 690                     java_trait_wrapper += arg_conv_info.java_ty + " _" + arg_conv_info.arg_name
 691                     java_meth_descr = java_meth_descr + arg_conv_info.java_fn_ty_arg
 692                 java_meth_descr = java_meth_descr + ")" + fn_line.ret_ty_info.java_fn_ty_arg
 693                 java_meths.append((fn_line.fn_name, java_meth_descr))
 694
 695                 out_java += ");\n"
 696                 out_java_trait += ");\n"
 697                 java_trait_wrapper += ") {\n"
 698
 699                 for arg_info in fn_line.args_ty:
 700                     if arg_info.to_hu_conv is not None:
 701                         java_trait_wrapper += "\t\t\t" + arg_info.to_hu_conv.replace("\n", "\n\t\t\t").replace(arg_info.arg_name, "_" + arg_info.arg_name) + "\n"
 702
 703                 if fn_line.ret_ty_info.java_ty != "void":
 704                     java_trait_wrapper += "\t\t\t" + fn_line.ret_ty_info.java_hu_ty + " ret = arg." + fn_name + "("
 705                 else:
 706                     java_trait_wrapper += "\t\t\targ." + fn_name + "("
 707
 708                 for idx, arg_info in enumerate(fn_line.args_ty):
 709                     if idx != 0:
 710                         java_trait_wrapper += ", "
 711                     if arg_info.to_hu_conv_name is not None:
 712                         java_trait_wrapper += arg_info.to_hu_conv_name.replace(arg_info.arg_name, "_" + arg_info.arg_name)
 713                     else:
 714                         java_trait_wrapper += "_" + arg_info.arg_name
 715
 716                 java_trait_wrapper += ");\n"
 717                 java_trait_wrapper += "\t\t\t\tGC.KeepAlive(arg);\n"
 718                 if fn_line.ret_ty_info.java_ty != "void":
 719                     if fn_line.ret_ty_info.from_hu_conv is not None:
 720                         java_trait_wrapper += "\t\t\t" + fn_line.ret_ty_info.java_ty + " result = " + fn_line.ret_ty_info.from_hu_conv[0] + ";\n"
 721                         if fn_line.ret_ty_info.from_hu_conv[1] != "":
 722                             java_trait_wrapper += "\t\t\t" + fn_line.ret_ty_info.from_hu_conv[1].replace("this", "impl_holder.held") + ";\n"
 723                         java_trait_wrapper += "\t\t\treturn result;\n"
 724                     else:
 725                         java_trait_wrapper += "\t\t\treturn ret;\n"
 726                 java_trait_wrapper += "\t\t}\n"
 727         java_trait_wrapper += "\t}"
 728         for var in field_vars:
 729             if isinstance(var, ConvInfo):
 730                 java_trait_constr = java_trait_constr + ", " + var.arg_name
 731             else:
 732                 java_trait_constr += ", " + var[1] + ".new_impl(" + var[1] + "_impl"
 733                 suptrait_constr = ""
 734                 for suparg in var[2]:
 735                     if isinstance(suparg, ConvInfo):
 736                         suptrait_constr += ", " + suparg.arg_name
 737                     else:
 738                         suptrait_constr += ", " + suparg[1] + "_impl"
 739                 java_trait_constr += suptrait_constr + ").bindings_instance"
 740                 for suparg in var[2]:
 741                     if isinstance(suparg, ConvInfo):
 742                         java_trait_constr += ", " + suparg.arg_name
 743                     else:
 744                         java_trait_constr += ", " + suparg[1] + ".new_impl("
 745                         # Blindly assume that we can just strip the first arg to build the args for the supertrait
 746                         java_trait_constr += suptrait_constr.split(", ", 1)[1]
 747                         java_trait_constr += ").bindings_instance"
 748         out_java_trait += "\t}\n" + java_trait_wrapper + "\n"
 749         out_java_trait += java_trait_constr + ");\n\t\treturn impl_holder.held;\n\t}\n"
 750
 751         out_java += "\t}\n"
 752
 753         out_java += self.native_meth_decl(struct_name + "_new", "long") + "(" + struct_name + " impl"
 754         for var in flattened_field_vars:
 755             if isinstance(var, ConvInfo):
 756                 out_java += ", " + var.java_ty + " " + var.arg_name
 757             else:
 758                 out_java += ", " + var[0] + " " + var[1]
 759         out_java += ");\n"
 760
 761         # Now that we've written out our java code (and created java_meths), generate C
 762         out_c = "typedef struct " + struct_name + "_JCalls {\n"
 763         out_c = out_c + "\tatomic_size_t refcnt;\n"
 764         out_c = out_c + "\tJavaVM *vm;\n"
 765         out_c = out_c + "\tjweak o;\n"
 766         for var in flattened_field_vars:
 767             if isinstance(var, ConvInfo):
 768                 # We're a regular ol' field
 769                 pass
 770             else:
 771                 # We're a supertrait
 772                 out_c = out_c + "\t" + var[0] + "_JCalls* " + var[1] + ";\n"
 773         for fn in field_fns:
 774             if fn.fn_name != "free" and fn.fn_name != "cloned":
 775                 out_c = out_c + "\tjmethodID " + fn.fn_name + "_meth;\n"
 776         out_c = out_c + "} " + struct_name + "_JCalls;\n"
 777
 778         for fn_line in field_fns:
 779             if fn_line.fn_name == "free":
 780                 out_c = out_c + "static void " + struct_name + "_JCalls_free(void* this_arg) {\n"
 781                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 782                 out_c = out_c + "\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n"
 783                 out_c += "\t\t" + self.construct_jenv().replace("\n", "\n\t\t").strip() + "\n"
 784                 out_c = out_c + "\t\t(*env)->DeleteWeakGlobalRef(env, j_calls->o);\n"
 785                 out_c += "\t\t" + self.deconstruct_jenv().replace("\n", "\n\t\t").strip() + "\n"
 786                 out_c = out_c + "\t\tFREE(j_calls);\n"
 787                 out_c = out_c + "\t}\n}\n"
 788
 789         for idx, fn_line in enumerate(field_fns):
 790             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 791                 assert fn_line.ret_ty_info.ty_info.get_full_rust_ty()[1] == ""
 792                 out_c = out_c + fn_line.ret_ty_info.ty_info.get_full_rust_ty()[0] + " " + fn_line.fn_name + "_" + struct_name + "_jcall("
 793                 if fn_line.self_is_const:
 794                     out_c = out_c + "const void* this_arg"
 795                 else:
 796                     out_c = out_c + "void* this_arg"
 797
 798                 for idx, arg in enumerate(fn_line.args_ty):
 799                     out_c = out_c + ", " + arg.ty_info.get_full_rust_ty()[0] + " " + arg.arg_name + arg.ty_info.get_full_rust_ty()[1]
 800
 801                 out_c = out_c + ") {\n"
 802                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 803                 out_c += "\t" + self.construct_jenv().replace("\n", "\n\t").strip() + "\n"
 804
 805                 for arg_info in fn_line.args_ty:
 806                     if arg_info.ret_conv is not None:
 807                         out_c = out_c + "\t" + arg_info.ret_conv[0].replace('\n', '\n\t')
 808                         out_c = out_c + arg_info.arg_name
 809                         out_c = out_c + arg_info.ret_conv[1].replace('\n', '\n\t') + "\n"
 810
 811                 out_c = out_c + "\tjobject obj = (*env)->NewLocalRef(env, j_calls->o);\n\tCHECK(obj != NULL);\n"
 812                 if fn_line.ret_ty_info.c_ty.endswith("Array"):
 813                     out_c = out_c + "\t" + fn_line.ret_ty_info.c_ty + " ret = (*env)->CallObjectMethod(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 814                 elif fn_line.ret_ty_info.c_ty == "void":
 815                     out_c += "\t(*env)->CallVoidMethod(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 816                 elif fn_line.ret_ty_info.java_hu_ty == "string" or "org/ldk/enums" in fn_line.ret_ty_info.java_fn_ty_arg:
 817                     # Manually write out string methods as they're just an Object
 818                     out_c += "\t" + fn_line.ret_ty_info.c_ty + " ret = (*env)->CallObjectMethod(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 819                 elif not fn_line.ret_ty_info.passed_as_ptr:
 820                     out_c += "\t" + fn_line.ret_ty_info.c_ty + " ret = (*env)->Call" + fn_line.ret_ty_info.java_ty.title() + "Method(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 821                 else:
 822                     out_c = out_c + "\tuint64_t ret = (*env)->CallLongMethod(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 823
 824                 for idx, arg_info in enumerate(fn_line.args_ty):
 825                     if arg_info.ret_conv is not None:
 826                         out_c = out_c + ", " + arg_info.ret_conv_name
 827                     else:
 828                         out_c = out_c + ", " + arg_info.arg_name
 829                 out_c = out_c + ");\n"
 830
 831                 out_c += "\tif (UNLIKELY((*env)->ExceptionCheck(env))) {\n"
 832                 out_c += "\t\t(*env)->ExceptionDescribe(env);\n"
 833                 out_c += "\t\t(*env)->FatalError(env, \"A call to " + fn_line.fn_name + " in " + struct_name + " from rust threw an exception.\");\n"
 834                 out_c += "\t}\n"
 835
 836                 if fn_line.ret_ty_info.arg_conv is not None:
 837                     out_c += "\t" + fn_line.ret_ty_info.arg_conv.replace("\n", "\n\t") + "\n"
 838                     out_c += "\t" + self.deconstruct_jenv().replace("\n", "\n\t").strip() + "\n"
 839                     out_c += "\treturn " + fn_line.ret_ty_info.arg_conv_name + ";\n"
 840                 else:
 841                     out_c += "\t" + self.deconstruct_jenv().replace("\n", "\n\t").strip() + "\n"
 842                     if not fn_line.ret_ty_info.passed_as_ptr and fn_line.ret_ty_info.c_ty != "void":
 843                         out_c += "\treturn ret;\n"
 844
 845                 out_c = out_c + "}\n"
 846
 847         # If we can, write out a clone function whether we need one or not, as we use them in moving to rust
 848         can_clone_with_ptr = True
 849         for var in field_vars:
 850             if isinstance(var, ConvInfo):
 851                 can_clone_with_ptr = False
 852         if can_clone_with_ptr:
 853             out_c = out_c + "static void " + struct_name + "_JCalls_cloned(" + struct_name + "* new_obj) {\n"
 854             out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) new_obj->this_arg;\n"
 855             out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n"
 856             for var in field_vars:
 857                 if not isinstance(var, ConvInfo):
 858                     out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->" + var[1] + "->refcnt, 1, memory_order_release);\n"
 859             out_c = out_c + "}\n"
 860
 861         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_init (" + self.c_fn_args_pfx + ", jobject o"
 862         for var in flattened_field_vars:
 863             if isinstance(var, ConvInfo):
 864                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 865             else:
 866                 out_c = out_c + ", jobject " + var[1]
 867         out_c = out_c + ") {\n"
 868
 869         out_c = out_c + "\tjclass c = (*env)->GetObjectClass(env, o);\n"
 870         out_c = out_c + "\tCHECK(c != NULL);\n"
 871         out_c = out_c + "\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n"
 872         out_c = out_c + "\tatomic_init(&calls->refcnt, 1);\n"
 873         out_c = out_c + "\tDO_ASSERT((*env)->GetJavaVM(env, &calls->vm) == 0);\n"
 874         out_c = out_c + "\tcalls->o = (*env)->NewWeakGlobalRef(env, o);\n"
 875
 876         for (fn_name, java_meth_descr) in java_meths:
 877             if fn_name != "free" and fn_name != "cloned":
 878                 out_c = out_c + "\tcalls->" + fn_name + "_meth = (*env)->GetMethodID(env, c, \"" + fn_name + "\", \"" + java_meth_descr + "\");\n"
 879                 out_c = out_c + "\tCHECK(calls->" + fn_name + "_meth != NULL);\n"
 880
 881         for var in flattened_field_vars:
 882             if isinstance(var, ConvInfo) and var.arg_conv is not None:
 883                 out_c = out_c + "\n\t" + var.arg_conv.replace("\n", "\n\t") +"\n"
 884         out_c = out_c + "\n\t" + struct_name + " ret = {\n"
 885         out_c = out_c + "\t\t.this_arg = (void*) calls,\n"
 886         for fn_line in field_fns:
 887             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 888                 out_c = out_c + "\t\t." + fn_line.fn_name + " = " + fn_line.fn_name + "_" + struct_name + "_jcall,\n"
 889             elif fn_line.fn_name == "free":
 890                 out_c = out_c + "\t\t.free = " + struct_name + "_JCalls_free,\n"
 891             else:
 892                 out_c = out_c + "\t\t.cloned = " + struct_name + "_JCalls_cloned,\n"
 893         for var in field_vars:
 894             if isinstance(var, ConvInfo):
 895                 if var.arg_conv_name is not None:
 896                     out_c = out_c + "\t\t." + var.arg_name + " = " + var.arg_conv_name + ",\n"
 897                     out_c = out_c + "\t\t.set_" + var.arg_name + " = NULL,\n"
 898                 else:
 899                     out_c = out_c + "\t\t." + var.var_name + " = " + var.var_name + ",\n"
 900                     out_c = out_c + "\t\t.set_" + var.var_name + " = NULL,\n"
 901             else:
 902                 out_c += "\t\t." + var[1] + " = " + var[0] + "_init(env, clz, " + var[1]
 903                 for suparg in var[2]:
 904                     if isinstance(suparg, ConvInfo):
 905                         out_c = out_c + ", " + suparg.arg_name
 906                     else:
 907                         out_c = out_c + ", " + suparg[1]
 908                 out_c += "),\n"
 909         out_c = out_c + "\t};\n"
 910         for var in flattened_field_vars:
 911             if not isinstance(var, ConvInfo):
 912                 out_c = out_c + "\tcalls->" + var[1] + " = ret." + var[1] + ".this_arg;\n"
 913         out_c = out_c + "\treturn ret;\n"
 914         out_c = out_c + "}\n"
 915
 916         out_c += "int64_t " + self.c_fn_name_define_pfx(struct_name + "_new", True) + "jobject o"
 917         for var in flattened_field_vars:
 918             if isinstance(var, ConvInfo):
 919                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 920             else:
 921                 out_c = out_c + ", jobject " + var[1]
 922         out_c = out_c + ") {\n"
 923         out_c = out_c + "\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n"
 924         out_c = out_c + "\t*res_ptr = " + struct_name + "_init(env, clz, o"
 925         for var in flattened_field_vars:
 926             if isinstance(var, ConvInfo):
 927                 out_c = out_c + ", " + var.arg_name
 928             else:
 929                 out_c = out_c + ", " + var[1]
 930         out_c = out_c + ");\n"
 931         out_c = out_c + "\treturn tag_ptr(res_ptr, true);\n"
 932         out_c = out_c + "}\n"
 933
 934         for var in flattened_field_vars:
 935             if not isinstance(var, ConvInfo):
 936                 out_java_trait += "\n\t/**\n"
 937                 out_java_trait += "\t * Gets the underlying " + var[1] + ".\n"
 938                 out_java_trait += "\t */\n"
 939                 underscore_name = ''.join('_' + c.lower() if c.isupper() else c for c in var[1]).strip('_')
 940                 out_java_trait += "\tpublic " + var[1] + " get_" + underscore_name + "() {\n"
 941                 out_java_trait += "\t\t" + var[1] + " res = new " + var[1] + "(null, bindings." + struct_name + "_get_" + var[1] + "(this.ptr));\n"
 942                 out_java_trait += "\t\tthis.ptrs_to.AddLast(res);\n"
 943                 out_java_trait += "\t\treturn res;\n"
 944                 out_java_trait += "\t}\n"
 945                 out_java_trait += "\n"
 946
 947                 out_java += self.native_meth_decl(struct_name + "_get_" + var[1], "long") + "(long arg);\n"
 948
 949                 out_c += "int64_t " + self.c_fn_name_define_pfx(struct_name + "_get_" + var[1], True) + "int64_t arg) {\n"
 950                 out_c += "\t" + struct_name + " *inp = (" + struct_name + " *)untag_ptr(arg);\n"
 951                 out_c += "\treturn tag_ptr(&inp->" + var[1] + ", false);\n"
 952                 out_c += "}\n"
 953
 954         return (out_java, out_java_trait, out_c)
 955
 956     def trait_struct_inc_refcnt(self, ty_info):
 957         base_conv = "\nif (" + ty_info.var_name + "_conv.free == " + ty_info.rust_obj + "_JCalls_free) {\n"
 958         base_conv = base_conv + "\t// If this_arg is a JCalls struct, then we need to increment the refcnt in it.\n"
 959         base_conv = base_conv + "\t" + ty_info.rust_obj + "_JCalls_cloned(&" + ty_info.var_name + "_conv);\n}"
 960         return base_conv
 961
 962     def map_complex_enum(self, struct_name, variant_list, camel_to_snake, enum_doc_comment):
 963         bindings_type = struct_name.replace("LDK", "")
 964         java_hu_type = struct_name.replace("LDK", "").replace("COption", "Option")
 965
 966         out_java_enum = ""
 967         out_java = ""
 968         out_c = ""
 969
 970         out_java_enum += (self.hu_struct_file_prefix)
 971
 972         java_hu_class = "/**\n * " + enum_doc_comment.replace("\n", "\n * ") + "\n */\n"
 973         java_hu_class += "public class " + java_hu_type + " : CommonBase {\n"
 974         java_hu_class += f"\tprotected {java_hu_type}(object _dummy, long ptr) : base(ptr)" + " { }\n"
 975         java_hu_class += "\t~" + java_hu_type + "() {\n"
 976         java_hu_class += "\t\tif (ptr != 0) { bindings." + bindings_type + "_free(ptr); }\n"
 977         java_hu_class += "\t}\n\n"
 978         java_hu_class += f"\tinternal static {java_hu_type} constr_from_ptr(long ptr) {{\n"
 979         java_hu_class += f"\t\tlong raw_ty = bindings." + struct_name + "_ty_from_ptr(ptr);\n"
 980         out_c += self.c_fn_ty_pfx + "uint32_t" + self.c_fn_name_define_pfx(struct_name + "_ty_from_ptr", True) + self.ptr_c_ty + " ptr) {\n"
 981         out_c += "\t" + struct_name + " *obj = (" + struct_name + "*)untag_ptr(ptr);\n"
 982         out_c += "\tswitch(obj->tag) {\n"
 983         java_hu_class += "\t\tswitch (raw_ty) {\n"
 984         java_hu_subclasses = ""
 985
 986         var_idx = 0
 987         for var in variant_list:
 988             java_hu_subclasses += "\t/** A " + java_hu_type + " of type " + var.var_name + " */\n"
 989             java_hu_subclasses += "\tpublic class " + java_hu_type + "_" + var.var_name + " : " + java_hu_type + " {\n"
 990             java_hu_class += f"\t\t\tcase {var_idx}: "
 991             java_hu_class += "return new " + java_hu_type + "_" + var.var_name + "(ptr);\n"
 992             out_c += f"\t\tcase {struct_name}_{var.var_name}: return {var_idx};\n"
 993             hu_conv_body = ""
 994             for idx, (field_ty, field_docs) in enumerate(var.fields):
 995                 if field_docs is not None:
 996                     java_hu_subclasses += "\t\t/**\n\t\t * " + field_docs.replace("\n", "\n\t\t * ") + "\n\t\t */\n"
 997                 java_hu_subclasses += f"\t\tpublic {field_ty.java_hu_ty} {field_ty.arg_name};\n"
 998                 if field_ty.to_hu_conv is not None:
 999                     hu_conv_body += f"\t\t\t{field_ty.java_ty} {field_ty.arg_name} = bindings.{struct_name}_{var.var_name}_get_{field_ty.arg_name}(ptr);\n"
1000                     hu_conv_body += f"\t\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
1001                     hu_conv_body += f"\t\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
1002                 else:
1003                     hu_conv_body += f"\t\t\tthis.{field_ty.arg_name} = bindings.{struct_name}_{var.var_name}_get_{field_ty.arg_name}(ptr);\n"
1004             java_hu_subclasses += "\t\tinternal " + java_hu_type + "_" + var.var_name + "(long ptr) : base(null, ptr) {\n"
1005             java_hu_subclasses += hu_conv_body
1006             java_hu_subclasses += "\t\t}\n\t}\n"
1007             var_idx += 1
1008         java_hu_class += "\t\t\tdefault:\n\t\t\t\tthrow new ArgumentException(\"Impossible enum variant\");\n\t\t}\n\t}\n\n"
1009         out_java += self.native_meth_decl(struct_name + "_ty_from_ptr", "long") + "(long ptr);\n"
1010         out_c += ("\t\tdefault: abort();\n")
1011         out_c += ("\t}\n}\n")
1012
1013         for var in variant_list:
1014             for idx, (field_map, _) in enumerate(var.fields):
1015                 fn_name = f"{struct_name}_{var.var_name}_get_{field_map.arg_name}"
1016                 out_c += self.c_fn_ty_pfx + field_map.c_ty + self.c_fn_name_define_pfx(fn_name, True) + self.ptr_c_ty + " ptr) {\n"
1017                 out_c += "\t" + struct_name + " *obj = (" + struct_name + "*)untag_ptr(ptr);\n"
1018                 out_c += f"\tassert(obj->tag == {struct_name}_{var.var_name});\n"
1019                 if field_map.ret_conv is not None:
1020                     out_c += ("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
1021                     if var.tuple_variant:
1022                         out_c += "obj->" + camel_to_snake(var.var_name)
1023                     else:
1024                         out_c += "obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name
1025                     out_c += (field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
1026                     out_c += "\treturn " + field_map.ret_conv_name + ";\n"
1027                 else:
1028                     if var.tuple_variant:
1029                         out_c += "\treturn " + "obj->" + camel_to_snake(var.var_name) + ";\n"
1030                     else:
1031                         out_c += "\treturn " + "obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name + ";\n"
1032                 out_c += "}\n"
1033                 out_java += self.native_meth_decl(fn_name, field_map.java_ty) + "(long ptr);\n"
1034         out_java_enum += java_hu_class
1035         out_java_enum += java_hu_subclasses
1036         return (out_java, out_java_enum, out_c)
1037
1038     def map_opaque_struct(self, struct_name, struct_doc_comment):
1039         out_opaque_struct_human = ""
1040         out_opaque_struct_human += self.hu_struct_file_prefix
1041         out_opaque_struct_human += "\n/**\n * " + struct_doc_comment.replace("\n", "\n * ") + "\n */\n"
1042         hu_name = struct_name.replace("LDKC2Tuple", "TwoTuple").replace("LDKC3Tuple", "ThreeTuple").replace("LDK", "")
1043         out_opaque_struct_human += ("public class " + hu_name + " : CommonBase")
1044         if struct_name.startswith("LDKLocked") or struct_name.startswith("LDKReadOnly"):
1045             out_opaque_struct_human += (", IDisposable")
1046         out_opaque_struct_human += (" {\n")
1047         out_opaque_struct_human += ("\tinternal " + hu_name + "(object _dummy, long ptr) : base(ptr) { }\n")
1048         if struct_name.startswith("LDKLocked") or struct_name.startswith("LDKReadOnly"):
1049             out_opaque_struct_human += ("\tpublic void Dispose() {\n")
1050         else:
1051             out_opaque_struct_human += ("\t~" + hu_name + "() {\n")
1052         out_opaque_struct_human += ("\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); }\n")
1053         out_opaque_struct_human += ("\t}\n\n")
1054         return out_opaque_struct_human
1055
1056     def map_tuple(self, struct_name):
1057         return self.map_opaque_struct(struct_name, "A Tuple")
1058
1059     def map_result(self, struct_name, res_map, err_map):
1060         human_ty = struct_name.replace("LDKCResult", "Result")
1061         java_hu_struct = ""
1062         java_hu_struct += self.hu_struct_file_prefix
1063         java_hu_struct += "public class " + human_ty + " : CommonBase {\n"
1064         java_hu_struct += "\t" + human_ty + "(object _dummy, long ptr) : base(ptr) { }\n"
1065         java_hu_struct += "\t~" + human_ty + "() {\n"
1066         java_hu_struct += "\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); }\n"
1067         java_hu_struct += "\t}\n\n"
1068         java_hu_struct += "\tinternal static " + human_ty + " constr_from_ptr(long ptr) {\n"
1069         java_hu_struct += "\t\tif (bindings." + struct_name.replace("LDK", "") + "_is_ok(ptr)) {\n"
1070         java_hu_struct += "\t\t\treturn new " + human_ty + "_OK(null, ptr);\n"
1071         java_hu_struct += "\t\t} else {\n"
1072         java_hu_struct += "\t\t\treturn new " + human_ty + "_Err(null, ptr);\n"
1073         java_hu_struct += "\t\t}\n"
1074         java_hu_struct += "\t}\n"
1075
1076         java_hu_struct += "\tpublic class " + human_ty + "_OK : " + human_ty + " {\n"
1077
1078         if res_map.java_hu_ty != "void":
1079             java_hu_struct += "\t\tpublic readonly " + res_map.java_hu_ty + " res;\n"
1080         java_hu_struct += "\t\tinternal " + human_ty + "_OK(object _dummy, long ptr) : base(_dummy, ptr) {\n"
1081         if res_map.java_hu_ty == "void":
1082             pass
1083         elif res_map.to_hu_conv is not None:
1084             java_hu_struct += "\t\t\t" + res_map.java_ty + " res = bindings." + struct_name.replace("LDK", "") + "_get_ok(ptr);\n"
1085             java_hu_struct += "\t\t\t" + res_map.to_hu_conv.replace("\n", "\n\t\t\t")
1086             java_hu_struct += "\n\t\t\tthis.res = " + res_map.to_hu_conv_name + ";\n"
1087         else:
1088             java_hu_struct += "\t\t\tthis.res = bindings." + struct_name.replace("LDK", "") + "_get_ok(ptr);\n"
1089         java_hu_struct += "\t\t}\n"
1090         java_hu_struct += "\t}\n\n"
1091
1092         java_hu_struct += "\tpublic class " + human_ty + "_Err : " + human_ty + " {\n"
1093         if err_map.java_hu_ty != "void":
1094             java_hu_struct += "\t\tpublic readonly " + err_map.java_hu_ty + " err;\n"
1095         java_hu_struct += "\t\tinternal " + human_ty + "_Err(object _dummy, long ptr) : base(_dummy, ptr) {\n"
1096         if err_map.java_hu_ty == "void":
1097             pass
1098         elif err_map.to_hu_conv is not None:
1099             java_hu_struct += "\t\t\t" + err_map.java_ty + " err = bindings." + struct_name.replace("LDK", "") + "_get_err(ptr);\n"
1100             java_hu_struct += "\t\t\t" + err_map.to_hu_conv.replace("\n", "\n\t\t\t")
1101             java_hu_struct += "\n\t\t\tthis.err = " + err_map.to_hu_conv_name + ";\n"
1102         else:
1103             java_hu_struct += "\t\t\tthis.err = bindings." + struct_name.replace("LDK", "") + "_get_err(ptr);\n"
1104         java_hu_struct += "\t\t}\n"
1105
1106         java_hu_struct += "\t}\n\n"
1107         return java_hu_struct
1108
1109     def map_function(self, argument_types, c_call_string, method_name, meth_n, return_type_info, struct_meth, default_constructor_args, takes_self, takes_self_as_ref, args_known, type_mapping_generator, doc_comment):
1110         arg_name_repl = lambda s, arg_name: s.replace(arg_name, "_" + arg_name) if arg_name == "lock" or arg_name == "event" or arg_name == "params" else s
1111         out_java = ""
1112         out_c = ""
1113         out_java_struct = None
1114
1115         out_java += self.native_meth_decl(method_name, return_type_info.java_ty) + "("
1116         out_c += (return_type_info.c_ty)
1117         if return_type_info.ret_conv is not None:
1118             ret_conv_pfx, ret_conv_sfx = return_type_info.ret_conv
1119         have_args = len(argument_types) > 1 or (len(argument_types) > 0 and argument_types[0].c_ty != "void")
1120         out_c += (" " + self.c_fn_name_define_pfx(method_name, have_args))
1121
1122         for idx, arg_conv_info in enumerate(argument_types):
1123             if idx != 0:
1124                 out_java += (", ")
1125                 out_c += (", ")
1126             if arg_conv_info.c_ty != "void":
1127                 out_c += (arg_conv_info.c_ty + " " + arg_conv_info.arg_name)
1128                 out_java += (arg_conv_info.java_ty + " _" + arg_conv_info.arg_name) # Add a _ to avoid using reserved words
1129
1130         out_java_struct = ""
1131         extra_java_struct_out = ""
1132         if not args_known:
1133             out_java_struct += ("\t// Skipped " + method_name + "\n")
1134         else:
1135             if doc_comment is not None:
1136                 out_java_struct += "\t/**\n\t * " + doc_comment.replace("\n", "\n\t * ") + "\n\t */\n"
1137             hu_ret_ty = return_type_info.java_hu_ty
1138             if return_type_info.nullable:
1139                 #hu_ret_ty += "?" - apparently mono doesn't support the nullable stuff
1140                 pass
1141             if not takes_self:
1142                 if meth_n == "new":
1143                     out_java_struct += "\tpublic static " + hu_ret_ty + " of("
1144                 elif meth_n == "default":
1145                     out_java_struct += "\tpublic static " + hu_ret_ty + " with_default("
1146                 else:
1147                     out_java_struct += "\tpublic static " + hu_ret_ty + " " + meth_n + "("
1148             elif meth_n == "clone_ptr" or (struct_meth.startswith("LDKCResult") and (meth_n == "get_ok" or meth_n == "get_err")):
1149                 out_java_struct += "\tinternal " + hu_ret_ty + " " + meth_n + "("
1150             else:
1151                 if meth_n == "hash" and return_type_info.java_hu_ty == "long":
1152                     extra_java_struct_out = "\tpublic override int GetHashCode() {\n"
1153                     extra_java_struct_out += "\t\treturn (int)this.hash();\n"
1154                     extra_java_struct_out += "\t}\n"
1155                 elif meth_n == "eq" and return_type_info.java_hu_ty == "bool":
1156                     extra_java_struct_out = "\tpublic override bool Equals(object o) {\n"
1157                     extra_java_struct_out += "\t\tif (!(o is " + struct_meth + ")) return false;\n"
1158                     extra_java_struct_out += "\t\treturn this.eq((" + struct_meth + ")o);\n"
1159                     extra_java_struct_out += "\t}\n"
1160                 if meth_n == "lock":
1161                     out_java_struct += "\tpublic " + hu_ret_ty + " do_lock("
1162                 else:
1163                     out_java_struct += "\tpublic " + hu_ret_ty + " " + meth_n + "("
1164             for idx, arg in enumerate(argument_types):
1165                 if idx != 0:
1166                     if not takes_self or idx > 1:
1167                         out_java_struct += ", "
1168                 elif takes_self:
1169                     continue
1170                 if arg.java_ty != "void":
1171                     if arg.arg_name in default_constructor_args:
1172                         assert not arg.nullable
1173                         for explode_idx, explode_arg in enumerate(default_constructor_args[arg.arg_name]):
1174                             if explode_idx != 0:
1175                                 out_java_struct += (", ")
1176                             out_java_struct += (
1177                                 explode_arg.java_hu_ty + " " + arg.arg_name + "_" + explode_arg.arg_name)
1178                     else:
1179                         ty_string = arg.java_hu_ty
1180                         if arg.nullable:
1181                             #ty_string += "?" - apparently mono doesn't support the nullable stuff
1182                             pass
1183                         ty_string = self.fully_qualified_hu_ty_path(arg)
1184                         out_java_struct += ty_string + " " + arg_name_repl(arg.arg_name, arg.arg_name)
1185         out_java += (");\n")
1186         out_c += (") {\n")
1187         if out_java_struct is not None:
1188             out_java_struct += (") {\n")
1189         for info in argument_types:
1190             if info.arg_conv is not None:
1191                 out_c += ("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
1192         if return_type_info.ret_conv is not None:
1193             out_c += ("\t" + ret_conv_pfx.replace('\n', '\n\t'))
1194         elif return_type_info.c_ty != "void":
1195             out_c += ("\t" + return_type_info.c_ty + " ret_val = ")
1196         else:
1197             out_c += ("\t")
1198         if c_call_string is None:
1199             out_c += (method_name + "(")
1200         else:
1201             out_c += (c_call_string)
1202         for idx, info in enumerate(argument_types):
1203             if info.arg_conv_name is not None:
1204                 if idx != 0:
1205                     out_c += (", ")
1206                 elif c_call_string is not None:
1207                     continue
1208                 out_c += (info.arg_conv_name)
1209         out_c += (")")
1210         if return_type_info.ret_conv is not None:
1211             out_c += (ret_conv_sfx.replace('\n', '\n\t'))
1212         else:
1213             out_c += (";")
1214         for info in argument_types:
1215             if info.arg_conv_cleanup is not None:
1216                 out_c += ("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
1217         if return_type_info.ret_conv is not None:
1218             out_c += ("\n\treturn " + return_type_info.ret_conv_name + ";")
1219         elif return_type_info.c_ty != "void":
1220             out_c += ("\n\treturn ret_val;")
1221         out_c += ("\n}\n\n")
1222
1223         if args_known:
1224             out_java_struct += ("\t\t")
1225             if return_type_info.java_ty != "void":
1226                 out_java_struct += (return_type_info.java_ty + " ret = ")
1227             out_java_struct += ("bindings." + method_name + "(")
1228             for idx, info in enumerate(argument_types):
1229                 if idx != 0:
1230                     out_java_struct += (", ")
1231                 if idx == 0 and takes_self:
1232                     out_java_struct += ("this.ptr")
1233                 elif info.arg_name in default_constructor_args:
1234                     out_java_struct += ("bindings." + info.java_hu_ty + "_new(")
1235                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
1236                         if explode_idx != 0:
1237                             out_java_struct += (", ")
1238                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1239                         if explode_arg.from_hu_conv is not None:
1240                             out_java_struct += (
1241                                 explode_arg.from_hu_conv[0].replace(explode_arg.arg_name, expl_arg_name))
1242                         else:
1243                             out_java_struct += (expl_arg_name)
1244                     out_java_struct += (")")
1245                 elif info.from_hu_conv is not None:
1246                     out_java_struct += arg_name_repl(info.from_hu_conv[0], info.arg_name)
1247                 else:
1248                     out_java_struct += arg_name_repl(info.arg_name, info.arg_name)
1249             out_java_struct += (");\n")
1250
1251             # Like Java, the C# GC is quite aggressive and can finalize an object while a method
1252             # on it is operating. Unlike Java, this behavior appears to be better documented,
1253             # which is nice.
1254             for idx, info in enumerate(argument_types):
1255                 if idx == 0 and takes_self:
1256                     out_java_struct += ("\t\tGC.KeepAlive(this);\n")
1257                 elif info.arg_name in default_constructor_args:
1258                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
1259                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1260                         out_java_struct += ("\t\tGC.KeepAlive(" + expl_arg_name + ");\n")
1261                 elif info.c_ty != "void":
1262                     out_java_struct += ("\t\tGC.KeepAlive(" + arg_name_repl(info.arg_name, info.arg_name) + ");\n")
1263
1264             if return_type_info.java_ty == "long" and return_type_info.java_hu_ty != "long":
1265                 out_java_struct += "\t\tif (ret >= 0 && ret <= 4096) { return null; }\n"
1266
1267             if return_type_info.to_hu_conv is not None:
1268                 if not takes_self:
1269                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t")
1270                         .replace("this", return_type_info.to_hu_conv_name) + "\n")
1271                 else:
1272                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t") + "\n")
1273
1274             for idx, info in enumerate(argument_types):
1275                 if idx == 0 and takes_self:
1276                     pass
1277                 elif info.arg_name in default_constructor_args:
1278                     for explode_arg in default_constructor_args[info.arg_name]:
1279                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1280                         if explode_arg.from_hu_conv is not None and return_type_info.to_hu_conv_name:
1281                             out_java_struct += ("\t\t" +
1282                                 arg_name_repl(explode_arg.from_hu_conv[1], info.arg_name)
1283                                 .replace(explode_arg.arg_name, expl_arg_name)
1284                                 .replace("this", return_type_info.to_hu_conv_name) + ";\n")
1285                 elif info.from_hu_conv is not None and info.from_hu_conv[1] != "":
1286                     if not takes_self and return_type_info.to_hu_conv_name is not None:
1287                         out_java_struct += ("\t\t" + arg_name_repl(info.from_hu_conv[1], info.arg_name)
1288                             .replace("this", return_type_info.to_hu_conv_name)
1289                             .replace("\n", "\n\t\t") + ";\n")
1290                     else:
1291                         out_java_struct += ("\t\t" + arg_name_repl(info.from_hu_conv[1], info.arg_name)
1292                             .replace("\n", "\n\t\t") + ";\n")
1293
1294             if takes_self and not takes_self_as_ref:
1295                 out_java_struct += "\t\t" + argument_types[0].from_hu_conv[1].replace("\n", "\n\t\t").replace("this_arg", "this") + ";\n"
1296             if return_type_info.to_hu_conv_name is not None:
1297                 out_java_struct += ("\t\treturn " + return_type_info.to_hu_conv_name + ";\n")
1298             elif return_type_info.java_ty != "void" and return_type_info.rust_obj != "LDK" + struct_meth:
1299                 out_java_struct += ("\t\treturn ret;\n")
1300             out_java_struct += ("\t}\n\n")
1301
1302         return (out_java, out_c, out_java_struct + extra_java_struct_out)
1303
1304     def cleanup(self):
1305         pass