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

   1 from bindingstypes import *
   2 from enum import Enum
   3
   4 class Target(Enum):
   5     JAVA = 1,
   6     ANDROID = 2
   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             uint8_t = ['byte'],
  14             uint16_t = ['short'],
  15             uint32_t = ['int'],
  16             uint64_t = ['long'],
  17         )
  18
  19         self.to_hu_conv_templates = dict(
  20             ptr = '{human_type} {var_name}_hu_conv = new {human_type}(null, {var_name});',
  21             default = '{human_type} {var_name}_hu_conv = new {human_type}(null, {var_name});'
  22         )
  23
  24         self.bindings_header = """package org.ldk.impl;
  25 import org.ldk.enums.*;
  26
  27 public class bindings {
  28         public static class VecOrSliceDef {
  29                 public long dataptr;
  30                 public long datalen;
  31                 public long stride;
  32                 public VecOrSliceDef(long dataptr, long datalen, long stride) {
  33                         this.dataptr = dataptr; this.datalen = datalen; this.stride = stride;
  34                 }
  35         }
  36         static {
  37                 System.loadLibrary(\"lightningjni\");
  38                 init(java.lang.Enum.class, VecOrSliceDef.class);
  39                 init_class_cache();
  40         }
  41         static native void init(java.lang.Class c, java.lang.Class slicedef);
  42         static native void init_class_cache();
  43
  44         public static native boolean deref_bool(long ptr);
  45         public static native long deref_long(long ptr);
  46         public static native void free_heap_ptr(long ptr);
  47         public static native byte[] read_bytes(long ptr, long len);
  48         public static native byte[] get_u8_slice_bytes(long slice_ptr);
  49         public static native long bytes_to_u8_vec(byte[] bytes);
  50         public static native long new_txpointer_copy_data(byte[] txdata);
  51         public static native void txpointer_free(long ptr);
  52         public static native byte[] txpointer_get_buffer(long ptr);
  53         public static native long vec_slice_len(long vec);
  54         public static native long new_empty_slice_vec();
  55
  56 """
  57
  58         self.bindings_footer = "}\n"
  59
  60         self.util_fn_pfx = """package org.ldk.structs;
  61 import org.ldk.impl.bindings;
  62 import java.util.Arrays;
  63
  64 public class UtilMethods {
  65 """
  66         self.util_fn_sfx = "}"
  67         self.common_base = """package org.ldk.structs;
  68 import java.util.LinkedList;
  69 class CommonBase {
  70         long ptr;
  71         LinkedList<Object> ptrs_to = new LinkedList();
  72         protected CommonBase(long ptr) { this.ptr = ptr; }
  73         public long _test_only_get_ptr() { return this.ptr; }
  74 }
  75 """
  76
  77         self.c_file_pfx = """#include \"org_ldk_impl_bindings.h\"
  78 #include <rust_types.h>
  79 #include <lightning.h>
  80 #include <string.h>
  81 #include <stdatomic.h>
  82 #include <stdlib.h>
  83
  84 """
  85
  86         if not DEBUG:
  87             self.c_file_pfx = self.c_file_pfx + """#define MALLOC(a, _) malloc(a)
  88 #define FREE(p) if ((long)(p) > 1024) { free(p); }
  89 #define DO_ASSERT(a) (void)(a)
  90 #define CHECK(a)
  91 """
  92         else:
  93             self.c_file_pfx = self.c_file_pfx + """#include <assert.h>
  94 // Always run a, then assert it is true:
  95 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
  96 // Assert a is true or do nothing
  97 #define CHECK(a) DO_ASSERT(a)
  98
  99 // Running a leak check across all the allocations and frees of the JDK is a mess,
 100 // so instead we implement our own naive leak checker here, relying on the -wrap
 101 // linker option to wrap malloc/calloc/realloc/free, tracking everyhing allocated
 102 // and free'd in Rust or C across the generated bindings shared library.
 103 #include <threads.h>
 104 #include <execinfo.h>
 105 #include <unistd.h>
 106 static mtx_t allocation_mtx;
 107
 108 void __attribute__((constructor)) init_mtx() {
 109         DO_ASSERT(mtx_init(&allocation_mtx, mtx_plain) == thrd_success);
 110 }
 111
 112 #define BT_MAX 128
 113 typedef struct allocation {
 114         struct allocation* next;
 115         void* ptr;
 116         const char* struct_name;
 117         void* bt[BT_MAX];
 118         int bt_len;
 119         size_t alloc_len;
 120 } allocation;
 121 static allocation* allocation_ll = NULL;
 122
 123 void* __real_malloc(size_t len);
 124 void* __real_calloc(size_t nmemb, size_t len);
 125 static void new_allocation(void* res, const char* struct_name, size_t len) {
 126         allocation* new_alloc = __real_malloc(sizeof(allocation));
 127         new_alloc->ptr = res;
 128         new_alloc->struct_name = struct_name;
 129         new_alloc->bt_len = backtrace(new_alloc->bt, BT_MAX);
 130         new_alloc->alloc_len = len;
 131         DO_ASSERT(mtx_lock(&allocation_mtx) == thrd_success);
 132         new_alloc->next = allocation_ll;
 133         allocation_ll = new_alloc;
 134         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
 135 }
 136 static void* MALLOC(size_t len, const char* struct_name) {
 137         void* res = __real_malloc(len);
 138         new_allocation(res, struct_name, len);
 139         return res;
 140 }
 141 void __real_free(void* ptr);
 142 static void alloc_freed(void* ptr) {
 143         allocation* p = NULL;
 144         DO_ASSERT(mtx_lock(&allocation_mtx) == thrd_success);
 145         allocation* it = allocation_ll;
 146         while (it->ptr != ptr) {
 147                 p = it; it = it->next;
 148                 if (it == NULL) {
 149                         fprintf(stderr, "Tried to free unknown pointer %p at:\\n", ptr);
 150                         void* bt[BT_MAX];
 151                         int bt_len = backtrace(bt, BT_MAX);
 152                         backtrace_symbols_fd(bt, bt_len, STDERR_FILENO);
 153                         fprintf(stderr, "\\n\\n");
 154                         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
 155                         return; // addrsan should catch malloc-unknown and print more info than we have
 156                 }
 157         }
 158         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
 159         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
 160         DO_ASSERT(it->ptr == ptr);
 161         __real_free(it);
 162 }
 163 static void FREE(void* ptr) {
 164         if ((long)ptr < 1024) return; // Rust loves to create pointers to the NULL page for dummys
 165         alloc_freed(ptr);
 166         __real_free(ptr);
 167 }
 168
 169 void* __wrap_malloc(size_t len) {
 170         void* res = __real_malloc(len);
 171         new_allocation(res, "malloc call", len);
 172         return res;
 173 }
 174 void* __wrap_calloc(size_t nmemb, size_t len) {
 175         void* res = __real_calloc(nmemb, len);
 176         new_allocation(res, "calloc call", len);
 177         return res;
 178 }
 179 void __wrap_free(void* ptr) {
 180         if (ptr == NULL) return;
 181         alloc_freed(ptr);
 182         __real_free(ptr);
 183 }
 184
 185 void* __real_realloc(void* ptr, size_t newlen);
 186 void* __wrap_realloc(void* ptr, size_t len) {
 187         if (ptr != NULL) alloc_freed(ptr);
 188         void* res = __real_realloc(ptr, len);
 189         new_allocation(res, "realloc call", len);
 190         return res;
 191 }
 192 void __wrap_reallocarray(void* ptr, size_t new_sz) {
 193         // Rust doesn't seem to use reallocarray currently
 194         DO_ASSERT(false);
 195 }
 196
 197 void __attribute__((destructor)) check_leaks() {
 198         size_t alloc_count = 0;
 199         size_t alloc_size = 0;
 200         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 201                 fprintf(stderr, "%s %p remains:\\n", a->struct_name, a->ptr);
 202                 backtrace_symbols_fd(a->bt, a->bt_len, STDERR_FILENO);
 203                 fprintf(stderr, "\\n\\n");
 204                 alloc_count++;
 205                 alloc_size += a->alloc_len;
 206         }
 207         fprintf(stderr, "%lu allocations remained for %lu bytes.\\n", alloc_count, alloc_size);
 208         DO_ASSERT(allocation_ll == NULL);
 209 }
 210 """
 211         self.c_file_pfx = self.c_file_pfx + """
 212 static jmethodID ordinal_meth = NULL;
 213 static jmethodID slicedef_meth = NULL;
 214 static jclass slicedef_cls = NULL;
 215 JNIEXPORT void Java_org_ldk_impl_bindings_init(JNIEnv * env, jclass _b, jclass enum_class, jclass slicedef_class) {
 216         ordinal_meth = (*env)->GetMethodID(env, enum_class, "ordinal", "()I");
 217         CHECK(ordinal_meth != NULL);
 218         slicedef_meth = (*env)->GetMethodID(env, slicedef_class, "<init>", "(JJJ)V");
 219         CHECK(slicedef_meth != NULL);
 220         slicedef_cls = (*env)->NewGlobalRef(env, slicedef_class);
 221         CHECK(slicedef_cls != NULL);
 222 }
 223
 224 JNIEXPORT jboolean JNICALL Java_org_ldk_impl_bindings_deref_1bool (JNIEnv * env, jclass _a, jlong ptr) {
 225         return *((bool*)ptr);
 226 }
 227 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_deref_1long (JNIEnv * env, jclass _a, jlong ptr) {
 228         return *((long*)ptr);
 229 }
 230 JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_free_1heap_1ptr (JNIEnv * env, jclass _a, jlong ptr) {
 231         FREE((void*)ptr);
 232 }
 233 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_read_1bytes (JNIEnv * env, jclass _b, jlong ptr, jlong len) {
 234         jbyteArray ret_arr = (*env)->NewByteArray(env, len);
 235         (*env)->SetByteArrayRegion(env, ret_arr, 0, len, (unsigned char*)ptr);
 236         return ret_arr;
 237 }
 238 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_get_1u8_1slice_1bytes (JNIEnv * env, jclass _b, jlong slice_ptr) {
 239         LDKu8slice *slice = (LDKu8slice*)slice_ptr;
 240         jbyteArray ret_arr = (*env)->NewByteArray(env, slice->datalen);
 241         (*env)->SetByteArrayRegion(env, ret_arr, 0, slice->datalen, slice->data);
 242         return ret_arr;
 243 }
 244 JNIEXPORT int64_t impl_bindings_bytes_1to_1u8_1vec (JNIEnv * env, jclass _b, jbyteArray bytes) {
 245         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "LDKCVec_u8");
 246         vec->datalen = (*env)->GetArrayLength(env, bytes);
 247         vec->data = (uint8_t*)MALLOC(vec->datalen, "LDKCVec_u8Z Bytes");
 248         (*env)->GetByteArrayRegion (env, bytes, 0, vec->datalen, vec->data);
 249         return (long)vec;
 250 }
 251 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_txpointer_1get_1buffer (JNIEnv * env, jclass _b, jlong ptr) {
 252         LDKTransaction *txdata = (LDKTransaction*)ptr;
 253         LDKu8slice slice;
 254         slice.data = txdata->data;
 255         slice.datalen = txdata->datalen;
 256         return Java_org_ldk_impl_bindings_get_1u8_1slice_1bytes(env, _b, (long)&slice);
 257 }
 258 JNIEXPORT int64_t JNICALL Java_org_ldk_impl_bindings_new_1txpointer_1copy_1data (JNIEnv * env, jclass _b, jbyteArray bytes) {
 259         LDKTransaction *txdata = (LDKTransaction*)MALLOC(sizeof(LDKTransaction), "LDKTransaction");
 260         txdata->datalen = (*env)->GetArrayLength(env, bytes);
 261         txdata->data = (uint8_t*)MALLOC(txdata->datalen, "Tx Data Bytes");
 262         txdata->data_is_owned = false;
 263         (*env)->GetByteArrayRegion (env, bytes, 0, txdata->datalen, txdata->data);
 264         return (long)txdata;
 265 }
 266 JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_txpointer_1free (JNIEnv * env, jclass _b, jlong ptr) {
 267         LDKTransaction *tx = (LDKTransaction*)ptr;
 268         tx->data_is_owned = true;
 269         Transaction_free(*tx);
 270         FREE((void*)ptr);
 271 }
 272 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_vec_1slice_1len (JNIEnv * env, jclass _a, jlong ptr) {
 273         // Check offsets of a few Vec types are all consistent as we're meant to be generic across types
 274         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_SignatureZ, datalen), "Vec<*> needs to be mapped identically");
 275         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_MessageSendEventZ, datalen), "Vec<*> needs to be mapped identically");
 276         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_EventZ, datalen), "Vec<*> needs to be mapped identically");
 277         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_C2Tuple_usizeTransactionZZ, datalen), "Vec<*> needs to be mapped identically");
 278         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)ptr;
 279         return (long)vec->datalen;
 280 }
 281 JNIEXPORT int64_t JNICALL Java_org_ldk_impl_bindings_new_1empty_1slice_1vec (JNIEnv * env, jclass _b) {
 282         // Check sizes of a few Vec types are all consistent as we're meant to be generic across types
 283         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_SignatureZ), "Vec<*> needs to be mapped identically");
 284         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_MessageSendEventZ), "Vec<*> needs to be mapped identically");
 285         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_EventZ), "Vec<*> needs to be mapped identically");
 286         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_C2Tuple_usizeTransactionZZ), "Vec<*> needs to be mapped identically");
 287         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "Empty LDKCVec");
 288         vec->data = NULL;
 289         vec->datalen = 0;
 290         return (long)vec;
 291 }
 292
 293 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
 294 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
 295 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
 296 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
 297
 298 _Static_assert(sizeof(jlong) == sizeof(int64_t), "We assume that j-types are the same as C types");
 299 _Static_assert(sizeof(jbyte) == sizeof(char), "We assume that j-types are the same as C types");
 300 _Static_assert(sizeof(void*) <= 8, "Pointers must fit into 64 bits");
 301
 302 typedef jlongArray int64_tArray;
 303 typedef jbyteArray int8_tArray;
 304
 305 static inline jstring str_ref_to_java(JNIEnv *env, const char* chars, size_t len) {
 306         // Sadly we need to create a temporary because Java can't accept a char* without a 0-terminator
 307         char* err_buf = MALLOC(len + 1, "str conv buf");
 308         memcpy(err_buf, chars, len);
 309         err_buf[len] = 0;
 310         jstring err_conv = (*env)->NewStringUTF(env, chars);
 311         FREE(err_buf);
 312         return err_conv;
 313 }
 314 """
 315
 316         self.hu_struct_file_prefix = """package org.ldk.structs;
 317
 318 import org.ldk.impl.bindings;
 319 import org.ldk.enums.*;
 320 import org.ldk.util.*;
 321 import java.util.Arrays;
 322
 323 @SuppressWarnings("unchecked") // We correctly assign various generic arrays
 324 """
 325         self.c_fn_ty_pfx = "JNIEXPORT "
 326         self.c_fn_args_pfx = "JNIEnv *env, jclass clz"
 327         self.file_ext = ".java"
 328         self.ptr_c_ty = "int64_t"
 329         self.ptr_native_ty = "long"
 330         self.result_c_ty = "jclass"
 331         self.ptr_arr = "jobjectArray"
 332         self.get_native_arr_len_call = ("(*env)->GetArrayLength(env, ", ")")
 333
 334     def release_native_arr_ptr_call(self, ty_info, arr_var, arr_ptr_var):
 335         if ty_info.subty is None or not ty_info.subty.c_ty.endswith("Array"):
 336             return "(*env)->ReleasePrimitiveArrayCritical(env, " + arr_var + ", " + arr_ptr_var + ", 0)"
 337         return None
 338     def create_native_arr_call(self, arr_len, ty_info):
 339         if ty_info.c_ty == "int8_tArray":
 340             return "(*env)->NewByteArray(env, " + arr_len + ")"
 341         elif ty_info.subty.c_ty.endswith("Array"):
 342             clz_var = ty_info.java_fn_ty_arg[1:].replace("[", "arr_of_")
 343             self.c_array_class_caches.add(clz_var)
 344             return "(*env)->NewObjectArray(env, " + arr_len + ", " + clz_var + "_clz, NULL);\n"
 345         else:
 346             return "(*env)->New" + ty_info.java_ty.strip("[]").title() + "Array(env, " + arr_len + ")"
 347     def set_native_arr_contents(self, arr_name, arr_len, ty_info):
 348         if ty_info.c_ty == "int8_tArray":
 349             return ("(*env)->SetByteArrayRegion(env, " + arr_name + ", 0, " + arr_len + ", ", ")")
 350         else:
 351             assert False
 352     def get_native_arr_contents(self, arr_name, dest_name, arr_len, ty_info, copy):
 353         if ty_info.c_ty == "int8_tArray":
 354             if copy:
 355                 return "(*env)->GetByteArrayRegion(env, " + arr_name + ", 0, " + arr_len + ", " + dest_name + ")"
 356             else:
 357                 return "(*env)->GetByteArrayElements (env, " + arr_name + ", NULL)"
 358         elif not ty_info.java_ty[:len(ty_info.java_ty) - 2].endswith("[]"):
 359             return "(*env)->Get" + ty_info.subty.java_ty.title() + "ArrayElements (env, " + arr_name + ", NULL)"
 360         else:
 361             return None
 362     def get_native_arr_elem(self, arr_name, idxc, ty_info):
 363         if self.get_native_arr_contents(arr_name, "", "", ty_info, False) is None:
 364             return "(*env)->GetObjectArrayElement(env, " + arr_name + ", " + idxc + ")"
 365         else:
 366             assert False # Only called if above is None
 367     def get_native_arr_ptr_call(self, ty_info):
 368         if ty_info.subty is not None and ty_info.subty.c_ty.endswith("Array"):
 369             return None
 370         return ("(*env)->GetPrimitiveArrayCritical(env, ", ", NULL)")
 371     def get_native_arr_entry_call(self, ty_info, arr_name, idxc, entry_access):
 372         if ty_info.subty is None or not ty_info.subty.c_ty.endswith("Array"):
 373             return None
 374         return "(*env)->SetObjectArrayElement(env, " + arr_name + ", " + idxc + ", " + entry_access + ")"
 375     def cleanup_native_arr_ref_contents(self, arr_name, dest_name, arr_len, ty_info):
 376         if ty_info.c_ty == "int8_tArray":
 377             return "(*env)->ReleaseByteArrayElements(env, " + arr_name + ", (int8_t*)" + dest_name + ", 0);"
 378         else:
 379             return "(*env)->Release" + ty_info.java_ty.strip("[]").title() + "ArrayElements(env, " + arr_name + ", " + dest_name + ", 0)"
 380
 381     def str_ref_to_c_call(self, var_name, str_len):
 382         return "str_ref_to_java(env, " + var_name + ", " + str_len + ")"
 383
 384     def c_fn_name_define_pfx(self, fn_name, has_args):
 385         if has_args:
 386             return "JNICALL Java_org_ldk_impl_bindings_" + fn_name.replace("_", "_1") + "(JNIEnv *env, jclass clz, "
 387         return "JNICALL Java_org_ldk_impl_bindings_" + fn_name.replace("_", "_1") + "(JNIEnv *env, jclass clz"
 388
 389     def init_str(self):
 390         res = ""
 391         for ty in self.c_array_class_caches:
 392             res = res + "static jclass " + ty + "_clz = NULL;\n"
 393         res = res + "JNIEXPORT void Java_org_ldk_impl_bindings_init_1class_1cache(JNIEnv * env, jclass clz) {\n"
 394         for ty in self.c_array_class_caches:
 395             res = res + "\t" + ty + "_clz = (*env)->FindClass(env, \"" + ty.replace("arr_of_", "[") + "\");\n"
 396             res = res + "\tCHECK(" + ty + "_clz != NULL);\n"
 397             res = res + "\t" + ty + "_clz = (*env)->NewGlobalRef(env, " + ty + "_clz);\n"
 398         res = res + "}\n"
 399         return res
 400
 401     def native_c_unitary_enum_map(self, struct_name, variants):
 402         out_java_enum = "package org.ldk.enums;\n\n"
 403         out_java = ""
 404         out_c = ""
 405         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_from_java(" + self.c_fn_args_pfx + ") {\n"
 406         out_c = out_c + "\tswitch ((*env)->CallIntMethod(env, clz, ordinal_meth)) {\n"
 407
 408         out_java_enum = out_java_enum + "public enum " + struct_name + " {\n"
 409         ord_v = 0
 410         for var in variants:
 411             out_java_enum = out_java_enum + "\t" + var + ",\n"
 412             out_c = out_c + "\t\tcase %d: return %s;\n" % (ord_v, var)
 413             ord_v = ord_v + 1
 414         out_java_enum = out_java_enum + "\t; static native void init();\n"
 415         out_java_enum = out_java_enum + "\tstatic { init(); }\n"
 416         out_java_enum = out_java_enum + "}"
 417         out_java = out_java + "\tstatic { " + struct_name + ".values(); /* Force enum statics to run */ }\n"
 418         out_c = out_c + "\t}\n"
 419         out_c = out_c + "\tabort();\n"
 420         out_c = out_c + "}\n"
 421
 422         out_c = out_c + "static jclass " + struct_name + "_class = NULL;\n"
 423         for var in variants:
 424             out_c = out_c + "static jfieldID " + struct_name + "_" + var + " = NULL;\n"
 425         out_c = out_c + self.c_fn_ty_pfx + "void JNICALL Java_org_ldk_enums_" + struct_name.replace("_", "_1") + "_init (" + self.c_fn_args_pfx + ") {\n"
 426         out_c = out_c + "\t" + struct_name + "_class = (*env)->NewGlobalRef(env, clz);\n"
 427         out_c = out_c + "\tCHECK(" + struct_name + "_class != NULL);\n"
 428         for var in variants:
 429             out_c = out_c + "\t" + struct_name + "_" + var + " = (*env)->GetStaticFieldID(env, " + struct_name + "_class, \"" + var + "\", \"Lorg/ldk/enums/" + struct_name + ";\");\n"
 430             out_c = out_c + "\tCHECK(" + struct_name + "_" + var + " != NULL);\n"
 431         out_c = out_c + "}\n"
 432         out_c = out_c + "static inline jclass " + struct_name + "_to_java(JNIEnv *env, " + struct_name + " val) {\n"
 433         out_c = out_c + "\tswitch (val) {\n"
 434         ord_v = 0
 435         for var in variants:
 436             out_c = out_c + "\t\tcase " + var + ":\n"
 437             out_c = out_c + "\t\t\treturn (*env)->GetStaticObjectField(env, " + struct_name + "_class, " + struct_name + "_" + var + ");\n"
 438             ord_v = ord_v + 1
 439         out_c = out_c + "\t\tdefault: abort();\n"
 440         out_c = out_c + "\t}\n"
 441         out_c = out_c + "}\n\n"
 442
 443         return (out_c, out_java_enum, out_java)
 444
 445     def c_unitary_enum_to_native_call(self, ty_info):
 446         return (ty_info.rust_obj + "_to_java(env, ", ")")
 447     def native_unitary_enum_to_c_call(self, ty_info):
 448         return (ty_info.rust_obj + "_from_java(env, ", ")")
 449
 450     def c_complex_enum_pfx(self, struct_name, variants, init_meth_jty_strs):
 451         out_c = ""
 452         for var in variants:
 453             out_c = out_c + "static jclass " + struct_name + "_" + var + "_class = NULL;\n"
 454             out_c = out_c + "static jmethodID " + struct_name + "_" + var + "_meth = NULL;\n"
 455         out_c = out_c + self.c_fn_ty_pfx + "void JNICALL Java_org_ldk_impl_bindings_00024" + struct_name.replace("_", "_1") + "_init (" + self.c_fn_args_pfx + ") {\n"
 456         for var_name in variants:
 457             out_c = out_c + "\t" + struct_name + "_" + var_name + "_class =\n"
 458             if self.target == Target.ANDROID:
 459                 out_c = out_c + "\t\t(*env)->NewGlobalRef(env, (*env)->FindClass(env, \"org/ldk/impl/bindings$" + struct_name + "$" + var_name + "\"));\n"
 460             else:
 461                 out_c = out_c + "\t\t(*env)->NewGlobalRef(env, (*env)->FindClass(env, \"Lorg/ldk/impl/bindings$" + struct_name + "$" + var_name + ";\"));\n"
 462             out_c = out_c + "\tCHECK(" + struct_name + "_" + var_name + "_class != NULL);\n"
 463             out_c = 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"
 464             out_c = out_c + "\tCHECK(" + struct_name + "_" + var_name + "_meth != NULL);\n"
 465         out_c = out_c + "}\n"
 466         return out_c
 467
 468     def c_complex_enum_pass_ty(self, struct_name):
 469         return "jobject"
 470
 471     def c_constr_native_complex_enum(self, struct_name, variant, c_params):
 472         ret = "(*env)->NewObject(env, " + struct_name + "_" + variant + "_class, " + struct_name + "_" + variant + "_meth"
 473         for param in c_params:
 474             ret = ret + ", " + param
 475         return ret + ")"
 476
 477     def native_c_map_trait(self, struct_name, field_vars, field_fns):
 478         out_java_trait = ""
 479         out_java = ""
 480
 481         # First generate most of the Java code, note that we need information about java method argument strings for C
 482         out_java_trait = out_java_trait + self.hu_struct_file_prefix
 483         out_java_trait = out_java_trait + "public class " + struct_name.replace("LDK","") + " extends CommonBase {\n"
 484         out_java_trait = out_java_trait + "\tfinal bindings." + struct_name + " bindings_instance;\n"
 485         out_java_trait = out_java_trait + "\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); bindings_instance = null; }\n"
 486         out_java_trait = out_java_trait + "\tprivate " + struct_name.replace("LDK", "") + "(bindings." + struct_name + " arg"
 487         for var in field_vars:
 488             if isinstance(var, ConvInfo):
 489                 out_java_trait = out_java_trait + ", " + var.java_hu_ty + " " + var.arg_name
 490             else:
 491                 out_java_trait = out_java_trait + ", bindings." + var[0] + " " + var[1]
 492         out_java_trait = out_java_trait + ") {\n"
 493         out_java_trait = out_java_trait + "\t\tsuper(bindings." + struct_name + "_new(arg"
 494         for var in field_vars:
 495             if isinstance(var, ConvInfo):
 496                 if var.from_hu_conv is not None:
 497                     out_java_trait = out_java_trait + ", " + var.from_hu_conv[0]
 498                 else:
 499                     out_java_trait = out_java_trait + ", " + var.arg_name
 500             else:
 501                 out_java_trait = out_java_trait + ", " + var[1]
 502         out_java_trait = out_java_trait + "));\n"
 503         out_java_trait = out_java_trait + "\t\tthis.ptrs_to.add(arg);\n"
 504         for var in field_vars:
 505             if isinstance(var, ConvInfo):
 506                 if var.from_hu_conv is not None and var.from_hu_conv[1] != "":
 507                     out_java_trait = out_java_trait + "\t\t" + var.from_hu_conv[1].replace("\n", "\n\t\t") + ";\n"
 508             else:
 509                 out_java_trait = out_java_trait + "\t\tthis.ptrs_to.add(" + var[1] + ");\n"
 510         out_java_trait = out_java_trait + "\t\tthis.bindings_instance = arg;\n"
 511         out_java_trait = out_java_trait + "\t}\n"
 512         out_java_trait = out_java_trait + "\t@Override @SuppressWarnings(\"deprecation\")\n"
 513         out_java_trait = out_java_trait + "\tprotected void finalize() throws Throwable {\n"
 514         out_java_trait = out_java_trait + "\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); } super.finalize();\n"
 515         out_java_trait = out_java_trait + "\t}\n\n"
 516
 517         java_trait_constr = "\tprivate static class " + struct_name + "Holder { " + struct_name.replace("LDK", "") + " held; }\n"
 518         java_trait_constr = java_trait_constr + "\tpublic static " + struct_name.replace("LDK", "") + " new_impl(" + struct_name.replace("LDK", "") + "Interface arg"
 519         for var in field_vars:
 520             if isinstance(var, ConvInfo):
 521                 java_trait_constr = java_trait_constr + ", " + var.java_hu_ty + " " + var.arg_name
 522             else:
 523                 # Ideally we'd be able to take any instance of the interface, but our C code can only represent
 524                 # Java-implemented version, so we require users pass a Java implementation here :/
 525                 java_trait_constr = java_trait_constr + ", " + var[0].replace("LDK", "") + "." + var[0].replace("LDK", "") + "Interface " + var[1] + "_impl"
 526         java_trait_constr = java_trait_constr + ") {\n\t\tfinal " + struct_name + "Holder impl_holder = new " + struct_name + "Holder();\n"
 527         java_trait_constr = java_trait_constr + "\t\timpl_holder.held = new " + struct_name.replace("LDK", "") + "(new bindings." + struct_name + "() {\n"
 528         out_java_trait = out_java_trait + "\tpublic static interface " + struct_name.replace("LDK", "") + "Interface {\n"
 529         out_java = out_java + "\tpublic interface " + struct_name + " {\n"
 530         java_meths = []
 531         for fn_line in field_fns:
 532             java_meth_descr = "("
 533             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 534                 out_java = out_java + "\t\t " + fn_line.ret_ty_info.java_ty + " " + fn_line.fn_name + "("
 535                 java_trait_constr = java_trait_constr + "\t\t\t@Override public " + fn_line.ret_ty_info.java_ty + " " + fn_line.fn_name + "("
 536                 out_java_trait = out_java_trait + "\t\t" + fn_line.ret_ty_info.java_hu_ty + " " + fn_line.fn_name + "("
 537
 538                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 539                     if idx >= 1:
 540                         out_java = out_java + ", "
 541                         java_trait_constr = java_trait_constr + ", "
 542                         out_java_trait = out_java_trait + ", "
 543                     out_java = out_java + arg_conv_info.java_ty + " " + arg_conv_info.arg_name
 544                     out_java_trait = out_java_trait + arg_conv_info.java_hu_ty + " " + arg_conv_info.arg_name
 545                     java_trait_constr = java_trait_constr + arg_conv_info.java_ty + " " + arg_conv_info.arg_name
 546                     java_meth_descr = java_meth_descr + arg_conv_info.java_fn_ty_arg
 547                 java_meth_descr = java_meth_descr + ")" + fn_line.ret_ty_info.java_fn_ty_arg
 548                 java_meths.append((fn_line.fn_name, java_meth_descr))
 549
 550                 out_java = out_java + ");\n"
 551                 out_java_trait = out_java_trait + ");\n"
 552                 java_trait_constr = java_trait_constr + ") {\n"
 553
 554                 for arg_info in fn_line.args_ty:
 555                     if arg_info.to_hu_conv is not None:
 556                         java_trait_constr = java_trait_constr + "\t\t\t\t" + arg_info.to_hu_conv.replace("\n", "\n\t\t\t\t") + "\n"
 557
 558                 if fn_line.ret_ty_info.java_ty != "void":
 559                     java_trait_constr = java_trait_constr + "\t\t\t\t" + fn_line.ret_ty_info.java_hu_ty + " ret = arg." + fn_line.fn_name + "("
 560                 else:
 561                     java_trait_constr = java_trait_constr + "\t\t\t\targ." + fn_line.fn_name + "("
 562
 563                 for idx, arg_info in enumerate(fn_line.args_ty):
 564                     if idx != 0:
 565                         java_trait_constr = java_trait_constr + ", "
 566                     if arg_info.to_hu_conv_name is not None:
 567                         java_trait_constr = java_trait_constr + arg_info.to_hu_conv_name
 568                     else:
 569                         java_trait_constr = java_trait_constr + arg_info.arg_name
 570
 571                 java_trait_constr = java_trait_constr + ");\n"
 572                 if fn_line.ret_ty_info.java_ty != "void":
 573                     if fn_line.ret_ty_info.from_hu_conv is not None:
 574                         java_trait_constr = java_trait_constr + "\t\t\t\t" + fn_line.ret_ty_info.java_ty + " result = " + fn_line.ret_ty_info.from_hu_conv[0] + ";\n"
 575                         if fn_line.ret_ty_info.from_hu_conv[1] != "":
 576                             java_trait_constr = java_trait_constr + "\t\t\t\t" + fn_line.ret_ty_info.from_hu_conv[1].replace("this", "impl_holder.held") + ";\n"
 577                         #if fn_line.ret_ty_info.rust_obj in result_types:
 578                         java_trait_constr = java_trait_constr + "\t\t\t\treturn result;\n"
 579                     else:
 580                         java_trait_constr = java_trait_constr + "\t\t\t\treturn ret;\n"
 581                 java_trait_constr = java_trait_constr + "\t\t\t}\n"
 582         java_trait_constr = java_trait_constr + "\t\t}"
 583         for var in field_vars:
 584             if isinstance(var, ConvInfo):
 585                 java_trait_constr = java_trait_constr + ", " + var.arg_name
 586             else:
 587                 java_trait_constr = java_trait_constr + ", " + var[1] + ".new_impl(" + var[1] + "_impl).bindings_instance"
 588         out_java_trait = out_java_trait + "\t}\n"
 589         out_java_trait = out_java_trait + java_trait_constr + ");\n\t\treturn impl_holder.held;\n\t}\n"
 590
 591         out_java = out_java + "\t}\n"
 592
 593         out_java = out_java + "\tpublic static native long " + struct_name + "_new(" + struct_name + " impl"
 594         for var in field_vars:
 595             if isinstance(var, ConvInfo):
 596                 out_java = out_java + ", " + var.java_ty + " " + var.arg_name
 597             else:
 598                 out_java = out_java + ", " + var[0] + " " + var[1]
 599         out_java = out_java + ");\n"
 600
 601         # Now that we've written out our java code (and created java_meths), generate C
 602         out_c = "typedef struct " + struct_name + "_JCalls {\n"
 603         out_c = out_c + "\tatomic_size_t refcnt;\n"
 604         out_c = out_c + "\tJavaVM *vm;\n"
 605         out_c = out_c + "\tjweak o;\n"
 606         for var in field_vars:
 607             if isinstance(var, ConvInfo):
 608                 # We're a regular ol' field
 609                 pass
 610             else:
 611                 # We're a supertrait
 612                 out_c = out_c + "\t" + var[0] + "_JCalls* " + var[1] + ";\n"
 613         for fn in field_fns:
 614             if fn.fn_name != "free" and fn.fn_name != "clone":
 615                 out_c = out_c + "\tjmethodID " + fn.fn_name + "_meth;\n"
 616         out_c = out_c + "} " + struct_name + "_JCalls;\n"
 617
 618         for fn_line in field_fns:
 619             if fn_line.fn_name == "free":
 620                 out_c = out_c + "static void " + struct_name + "_JCalls_free(void* this_arg) {\n"
 621                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 622                 out_c = out_c + "\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n"
 623                 out_c = out_c + "\t\tJNIEnv *env;\n"
 624                 out_c = out_c + "\t\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_6) == JNI_OK);\n"
 625                 out_c = out_c + "\t\t(*env)->DeleteWeakGlobalRef(env, j_calls->o);\n"
 626                 out_c = out_c + "\t\tFREE(j_calls);\n"
 627                 out_c = out_c + "\t}\n}\n"
 628
 629         for idx, fn_line in enumerate(field_fns):
 630             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 631                 assert fn_line.ret_ty_info.ty_info.get_full_rust_ty()[1] == ""
 632                 out_c = out_c + fn_line.ret_ty_info.ty_info.get_full_rust_ty()[0] + " " + fn_line.fn_name + "_jcall("
 633                 if fn_line.self_is_const:
 634                     out_c = out_c + "const void* this_arg"
 635                 else:
 636                     out_c = out_c + "void* this_arg"
 637
 638                 for idx, arg in enumerate(fn_line.args_ty):
 639                     out_c = out_c + ", " + arg.ty_info.get_full_rust_ty()[0] + " " + arg.arg_name + arg.ty_info.get_full_rust_ty()[1]
 640
 641                 out_c = out_c + ") {\n"
 642                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 643                 out_c = out_c + "\tJNIEnv *env;\n"
 644                 out_c = out_c + "\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_6) == JNI_OK);\n"
 645
 646                 for arg_info in fn_line.args_ty:
 647                     if arg_info.ret_conv is not None:
 648                         out_c = out_c + "\t" + arg_info.ret_conv[0].replace('\n', '\n\t')
 649                         out_c = out_c + arg_info.arg_name
 650                         out_c = out_c + arg_info.ret_conv[1].replace('\n', '\n\t') + "\n"
 651
 652                 out_c = out_c + "\tjobject obj = (*env)->NewLocalRef(env, j_calls->o);\n\tCHECK(obj != NULL);\n"
 653                 if fn_line.ret_ty_info.c_ty.endswith("Array"):
 654                     out_c = out_c + "\t" + fn_line.ret_ty_info.c_ty + " arg = (*env)->CallObjectMethod(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 655                 elif not fn_line.ret_ty_info.passed_as_ptr:
 656                     out_c = out_c + "\treturn (*env)->Call" + fn_line.ret_ty_info.java_ty.title() + "Method(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 657                 else:
 658                     out_c = out_c + "\t" + fn_line.ret_ty_info.rust_obj + "* ret = (" + fn_line.ret_ty_info.rust_obj + "*)(*env)->CallLongMethod(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 659
 660                 for idx, arg_info in enumerate(fn_line.args_ty):
 661                     if arg_info.ret_conv is not None:
 662                         out_c = out_c + ", " + arg_info.ret_conv_name
 663                     else:
 664                         out_c = out_c + ", " + arg_info.arg_name
 665                 out_c = out_c + ");\n"
 666                 if fn_line.ret_ty_info.arg_conv is not None:
 667                     out_c = out_c + "\t" + fn_line.ret_ty_info.arg_conv.replace("\n", "\n\t") + "\n\treturn " + fn_line.ret_ty_info.arg_conv_name + ";\n"
 668
 669                 out_c = out_c + "}\n"
 670
 671         # Write out a clone function whether we need one or not, as we use them in moving to rust
 672         out_c = out_c + "static void* " + struct_name + "_JCalls_clone(const void* this_arg) {\n"
 673         out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 674         out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n"
 675         for var in field_vars:
 676             if not isinstance(var, ConvInfo):
 677                 out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->" + var[1] + "->refcnt, 1, memory_order_release);\n"
 678         out_c = out_c + "\treturn (void*) this_arg;\n"
 679         out_c = out_c + "}\n"
 680
 681         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_init (" + self.c_fn_args_pfx + ", jobject o"
 682         for var in field_vars:
 683             if isinstance(var, ConvInfo):
 684                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 685             else:
 686                 out_c = out_c + ", jobject " + var[1]
 687         out_c = out_c + ") {\n"
 688
 689         out_c = out_c + "\tjclass c = (*env)->GetObjectClass(env, o);\n"
 690         out_c = out_c + "\tCHECK(c != NULL);\n"
 691         out_c = out_c + "\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n"
 692         out_c = out_c + "\tatomic_init(&calls->refcnt, 1);\n"
 693         out_c = out_c + "\tDO_ASSERT((*env)->GetJavaVM(env, &calls->vm) == 0);\n"
 694         out_c = out_c + "\tcalls->o = (*env)->NewWeakGlobalRef(env, o);\n"
 695
 696         for (fn_name, java_meth_descr) in java_meths:
 697             if fn_name != "free" and fn_name != "clone":
 698                 out_c = out_c + "\tcalls->" + fn_name + "_meth = (*env)->GetMethodID(env, c, \"" + fn_name + "\", \"" + java_meth_descr + "\");\n"
 699                 out_c = out_c + "\tCHECK(calls->" + fn_name + "_meth != NULL);\n"
 700
 701         for var in field_vars:
 702             if isinstance(var, ConvInfo) and var.arg_conv is not None:
 703                 out_c = out_c + "\n\t" + var.arg_conv.replace("\n", "\n\t") +"\n"
 704         out_c = out_c + "\n\t" + struct_name + " ret = {\n"
 705         out_c = out_c + "\t\t.this_arg = (void*) calls,\n"
 706         for fn_line in field_fns:
 707             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 708                 out_c = out_c + "\t\t." + fn_line.fn_name + " = " + fn_line.fn_name + "_jcall,\n"
 709             elif fn_line.fn_name == "free":
 710                 out_c = out_c + "\t\t.free = " + struct_name + "_JCalls_free,\n"
 711             else:
 712                 out_c = out_c + "\t\t.clone = " + struct_name + "_JCalls_clone,\n"
 713         for var in field_vars:
 714             if isinstance(var, ConvInfo):
 715                 if var.arg_conv_name is not None:
 716                     out_c = out_c + "\t\t." + var.arg_name + " = " + var.arg_conv_name + ",\n"
 717                     out_c = out_c + "\t\t.set_" + var.arg_name + " = NULL,\n"
 718                 else:
 719                     out_c = out_c + "\t\t." + var.var_name + " = " + var.var_name + ",\n"
 720                     out_c = out_c + "\t\t.set_" + var.var_name + " = NULL,\n"
 721             else:
 722                 out_c = out_c + "\t\t." + var[1] + " = " + var[0] + "_init(env, clz, " + var[1] + "),\n"
 723         out_c = out_c + "\t};\n"
 724         for var in field_vars:
 725             if not isinstance(var, ConvInfo):
 726                 out_c = out_c + "\tcalls->" + var[1] + " = ret." + var[1] + ".this_arg;\n"
 727         out_c = out_c + "\treturn ret;\n"
 728         out_c = out_c + "}\n"
 729
 730         out_c = out_c + self.c_fn_ty_pfx + "int64_t " + self.c_fn_name_define_pfx(struct_name + "_new", True) + "jobject o"
 731         for var in field_vars:
 732             if isinstance(var, ConvInfo):
 733                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 734             else:
 735                 out_c = out_c + ", jobject " + var[1]
 736         out_c = out_c + ") {\n"
 737         out_c = out_c + "\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n"
 738         out_c = out_c + "\t*res_ptr = " + struct_name + "_init(env, clz, o"
 739         for var in field_vars:
 740             if isinstance(var, ConvInfo):
 741                 out_c = out_c + ", " + var.arg_name
 742             else:
 743                 out_c = out_c + ", " + var[1]
 744         out_c = out_c + ");\n"
 745         out_c = out_c + "\treturn (long)res_ptr;\n"
 746         out_c = out_c + "}\n"
 747
 748         return (out_java, out_java_trait, out_c)
 749
 750     def trait_struct_inc_refcnt(self, ty_info):
 751         base_conv = "\nif (" + ty_info.var_name + "_conv.free == " + ty_info.rust_obj + "_JCalls_free) {\n"
 752         base_conv = base_conv + "\t// If this_arg is a JCalls struct, then we need to increment the refcnt in it.\n"
 753         base_conv = base_conv + "\t" + ty_info.rust_obj + "_JCalls_clone(" + ty_info.var_name + "_conv.this_arg);\n}"
 754         return base_conv
 755
 756     def map_complex_enum(self, struct_name, variant_list, camel_to_snake):
 757         java_hu_type = struct_name.replace("LDK", "")
 758         out_java_enum = ""
 759         out_java = ""
 760         out_c = ""
 761
 762         out_java_enum += (self.hu_struct_file_prefix)
 763         out_java_enum += ("public class " + java_hu_type + " extends CommonBase {\n")
 764         out_java_enum += ("\tprivate " + java_hu_type + "(Object _dummy, long ptr) { super(ptr); }\n")
 765         out_java_enum += ("\t@Override @SuppressWarnings(\"deprecation\")\n")
 766         out_java_enum += ("\tprotected void finalize() throws Throwable {\n")
 767         out_java_enum += ("\t\tsuper.finalize();\n")
 768         out_java_enum += ("\t\tif (ptr != 0) { bindings." + java_hu_type + "_free(ptr); }\n")
 769         out_java_enum += ("\t}\n")
 770         out_java_enum += ("\tstatic " + java_hu_type + " constr_from_ptr(long ptr) {\n")
 771         out_java_enum += ("\t\tbindings." + struct_name + " raw_val = bindings." + struct_name + "_ref_from_ptr(ptr);\n")
 772         java_hu_subclasses = ""
 773
 774         init_meth_jty_strs = {}
 775
 776         out_java +=  ("\tpublic static class " + struct_name + " {\n")
 777         out_java +=  ("\t\tprivate " + struct_name + "() {}\n")
 778         for var in variant_list:
 779             out_java +=  ("\t\tpublic final static class " + var.var_name + " extends " + struct_name + " {\n")
 780             java_hu_subclasses = java_hu_subclasses + "\tpublic final static class " + var.var_name + " extends " + java_hu_type + " {\n"
 781             out_java_enum += ("\t\tif (raw_val.getClass() == bindings." + struct_name + "." + var.var_name + ".class) {\n")
 782             out_java_enum += ("\t\t\treturn new " + var.var_name + "(ptr, (bindings." + struct_name + "." + var.var_name + ")raw_val);\n")
 783             init_meth_jty_str = ""
 784             init_meth_params = ""
 785             init_meth_body = ""
 786             hu_conv_body = ""
 787             for idx, field_ty in enumerate(var.fields):
 788                 out_java += ("\t\t\tpublic " + field_ty.java_ty + " " + field_ty.arg_name + ";\n")
 789                 java_hu_subclasses = java_hu_subclasses + "\t\tpublic final " + field_ty.java_hu_ty + " " + field_ty.arg_name + ";\n"
 790                 if field_ty.to_hu_conv is not None:
 791                     hu_conv_body = hu_conv_body + "\t\t\t" + field_ty.java_ty + " " + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
 792                     hu_conv_body = hu_conv_body + "\t\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
 793                     hu_conv_body = hu_conv_body + "\t\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
 794                 else:
 795                     hu_conv_body = hu_conv_body + "\t\t\tthis." + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
 796                 init_meth_jty_str = init_meth_jty_str + field_ty.java_fn_ty_arg
 797                 if idx > 0:
 798                     init_meth_params = init_meth_params + ", "
 799                 init_meth_params = init_meth_params + field_ty.java_ty + " " + field_ty.arg_name
 800                 init_meth_body = init_meth_body + "this." + field_ty.arg_name + " = " + field_ty.arg_name + "; "
 801             out_java +=  ("\t\t\t" + var.var_name + "(" + init_meth_params + ") { ")
 802             out_java +=  (init_meth_body)
 803             out_java +=  ("}\n")
 804             out_java += ("\t\t}\n")
 805             out_java_enum += ("\t\t}\n")
 806             java_hu_subclasses = java_hu_subclasses + "\t\tprivate " + var.var_name + "(long ptr, bindings." + struct_name + "." + var.var_name + " obj) {\n\t\t\tsuper(null, ptr);\n"
 807             java_hu_subclasses = java_hu_subclasses + hu_conv_body
 808             java_hu_subclasses = java_hu_subclasses + "\t\t}\n\t}\n"
 809             init_meth_jty_strs[var.var_name] = init_meth_jty_str
 810         out_java += ("\t\tstatic native void init();\n")
 811         out_java += ("\t}\n")
 812         out_java_enum += ("\t\tassert false; return null; // Unreachable without extending the (internal) bindings interface\n\t}\n\n")
 813         out_java_enum += (java_hu_subclasses)
 814         out_java += ("\tstatic { " + struct_name + ".init(); }\n")
 815         out_java += ("\tpublic static native " + struct_name + " " + struct_name + "_ref_from_ptr(long ptr);\n");
 816
 817         out_c += (self.c_complex_enum_pfx(struct_name, [x.var_name for x in variant_list], init_meth_jty_strs))
 818
 819         out_c += (self.c_fn_ty_pfx + self.c_complex_enum_pass_ty(struct_name) + " " + self.c_fn_name_define_pfx(struct_name + "_ref_from_ptr", True) + self.ptr_c_ty + " ptr) {\n")
 820         out_c += ("\t" + struct_name + " *obj = (" + struct_name + "*)ptr;\n")
 821         out_c += ("\tswitch(obj->tag) {\n")
 822         for var in variant_list:
 823             out_c += ("\t\tcase " + struct_name + "_" + var.var_name + ": {\n")
 824             c_params = []
 825             for idx, field_map in enumerate(var.fields):
 826                 if field_map.ret_conv is not None:
 827                     out_c += ("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
 828                     out_c += ("obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name)
 829                     out_c += (field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
 830                     c_params.append(field_map.ret_conv_name)
 831                 else:
 832                     c_params.append("obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name)
 833             out_c += ("\t\t\treturn " + self.c_constr_native_complex_enum(struct_name, var.var_name, c_params) + ";\n")
 834             out_c += ("\t\t}\n")
 835         out_c += ("\t\tdefault: abort();\n")
 836         out_c += ("\t}\n}\n")
 837         out_java_enum += ("}\n")
 838         return (out_java, out_java_enum, out_c)
 839
 840     def map_opaque_struct(self, struct_name):
 841         out_opaque_struct_human = ""
 842         out_opaque_struct_human += self.hu_struct_file_prefix
 843         out_opaque_struct_human += ("public class " + struct_name.replace("LDK","") + " extends CommonBase")
 844         if struct_name.startswith("LDKLocked"):
 845             out_opaque_struct_human += (" implements AutoCloseable")
 846         out_opaque_struct_human += (" {\n")
 847         out_opaque_struct_human += ("\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); }\n")
 848         if struct_name.startswith("LDKLocked"):
 849             out_opaque_struct_human += ("\t@Override public void close() {\n")
 850         else:
 851             out_opaque_struct_human += ("\t@Override @SuppressWarnings(\"deprecation\")\n")
 852             out_opaque_struct_human += ("\tprotected void finalize() throws Throwable {\n")
 853             out_opaque_struct_human += ("\t\tsuper.finalize();\n")
 854         out_opaque_struct_human += ("\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); }\n")
 855         out_opaque_struct_human += ("\t}\n\n")
 856         return out_opaque_struct_human
 857
 858
 859     def map_function(self, argument_types, c_call_string, method_name, return_type_info, struct_meth, default_constructor_args, takes_self, args_known, type_mapping_generator):
 860         out_java = ""
 861         out_c = ""
 862         out_java_struct = None
 863
 864         out_java += ("\tpublic static native ")
 865         out_c += (self.c_fn_ty_pfx)
 866         out_c += (return_type_info.c_ty)
 867         out_java += (return_type_info.java_ty)
 868         if return_type_info.ret_conv is not None:
 869             ret_conv_pfx, ret_conv_sfx = return_type_info.ret_conv
 870         out_java += (" " + method_name + "(")
 871         have_args = len(argument_types) > 1 or (len(argument_types) > 0 and argument_types[0].c_ty != "void")
 872         out_c += (" " + self.c_fn_name_define_pfx(method_name, have_args))
 873
 874         for idx, arg_conv_info in enumerate(argument_types):
 875             if idx != 0:
 876                 out_java += (", ")
 877                 out_c += (", ")
 878             if arg_conv_info.c_ty != "void":
 879                 out_c += (arg_conv_info.c_ty + " " + arg_conv_info.arg_name)
 880                 out_java += (arg_conv_info.java_ty + " " + arg_conv_info.arg_name)
 881
 882         out_java_struct = ""
 883         if not args_known:
 884             out_java_struct += ("\t// Skipped " + method_name + "\n")
 885         else:
 886             meth_n = method_name[len(struct_meth) + 1:]
 887             if not takes_self:
 888                 out_java_struct += (
 889                     "\tpublic static " + return_type_info.java_hu_ty + " constructor_" + meth_n + "(")
 890             else:
 891                 out_java_struct += ("\tpublic " + return_type_info.java_hu_ty + " " + meth_n + "(")
 892             for idx, arg in enumerate(argument_types):
 893                 if idx != 0:
 894                     if not takes_self or idx > 1:
 895                         out_java_struct += (", ")
 896                 elif takes_self:
 897                     continue
 898                 if arg.java_ty != "void":
 899                     if arg.arg_name in default_constructor_args:
 900                         for explode_idx, explode_arg in enumerate(default_constructor_args[arg.arg_name]):
 901                             if explode_idx != 0:
 902                                 out_java_struct += (", ")
 903                             out_java_struct += (
 904                                 explode_arg.java_hu_ty + " " + arg.arg_name + "_" + explode_arg.arg_name)
 905                     else:
 906                         out_java_struct += (arg.java_hu_ty + " " + arg.arg_name)
 907         out_java += (");\n")
 908         out_c += (") {\n")
 909         if out_java_struct is not None:
 910             out_java_struct += (") {\n")
 911         for info in argument_types:
 912             if info.arg_conv is not None:
 913                 out_c += ("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
 914         if return_type_info.ret_conv is not None:
 915             out_c += ("\t" + ret_conv_pfx.replace('\n', '\n\t'))
 916         elif return_type_info.c_ty != "void":
 917             out_c += ("\t" + return_type_info.c_ty + " ret_val = ")
 918         else:
 919             out_c += ("\t")
 920         if c_call_string is None:
 921             out_c += (method_name + "(")
 922         else:
 923             out_c += (c_call_string)
 924         for idx, info in enumerate(argument_types):
 925             if info.arg_conv_name is not None:
 926                 if idx != 0:
 927                     out_c += (", ")
 928                 elif c_call_string is not None:
 929                     continue
 930                 out_c += (info.arg_conv_name)
 931         out_c += (")")
 932         if return_type_info.ret_conv is not None:
 933             out_c += (ret_conv_sfx.replace('\n', '\n\t'))
 934         else:
 935             out_c += (";")
 936         for info in argument_types:
 937             if info.arg_conv_cleanup is not None:
 938                 out_c += ("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
 939         if return_type_info.ret_conv is not None:
 940             out_c += ("\n\treturn " + return_type_info.ret_conv_name + ";")
 941         elif return_type_info.c_ty != "void":
 942             out_c += ("\n\treturn ret_val;")
 943         out_c += ("\n}\n\n")
 944
 945         if args_known:
 946             out_java_struct += ("\t\t")
 947             if return_type_info.java_ty != "void":
 948                 out_java_struct += (return_type_info.java_ty + " ret = ")
 949             out_java_struct += ("bindings." + method_name + "(")
 950             for idx, info in enumerate(argument_types):
 951                 if idx != 0:
 952                     out_java_struct += (", ")
 953                 if idx == 0 and takes_self:
 954                     out_java_struct += ("this.ptr")
 955                 elif info.arg_name in default_constructor_args:
 956                     out_java_struct += ("bindings." + info.java_hu_ty + "_new(")
 957                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
 958                         if explode_idx != 0:
 959                             out_java_struct += (", ")
 960                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
 961                         if explode_arg.from_hu_conv is not None:
 962                             out_java_struct += (
 963                                 explode_arg.from_hu_conv[0].replace(explode_arg.arg_name, expl_arg_name))
 964                         else:
 965                             out_java_struct += (expl_arg_name)
 966                     out_java_struct += (")")
 967                 elif info.from_hu_conv is not None:
 968                     out_java_struct += (info.from_hu_conv[0])
 969                 else:
 970                     out_java_struct += (info.arg_name)
 971             out_java_struct += (");\n")
 972             if return_type_info.to_hu_conv is not None:
 973                 if not takes_self:
 974                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t").replace("this",
 975                                                                                                                return_type_info.to_hu_conv_name) + "\n")
 976                 else:
 977                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t") + "\n")
 978
 979             for idx, info in enumerate(argument_types):
 980                 if idx == 0 and takes_self:
 981                     pass
 982                 elif info.arg_name in default_constructor_args:
 983                     for explode_arg in default_constructor_args[info.arg_name]:
 984                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
 985                         if explode_arg.from_hu_conv is not None and return_type_info.to_hu_conv_name:
 986                             out_java_struct += ("\t\t" + explode_arg.from_hu_conv[1].replace(explode_arg.arg_name,
 987                                                                                                expl_arg_name).replace(
 988                                 "this", return_type_info.to_hu_conv_name) + ";\n")
 989                 elif info.from_hu_conv is not None and info.from_hu_conv[1] != "":
 990                     if not takes_self and return_type_info.to_hu_conv_name is not None:
 991                         out_java_struct += (
 992                             "\t\t" + info.from_hu_conv[1].replace("this", return_type_info.to_hu_conv_name).replace("\n", "\n\t\t") + ";\n")
 993                     else:
 994                         out_java_struct += ("\t\t" + info.from_hu_conv[1].replace("\n", "\n\t\t") + ";\n")
 995
 996             if return_type_info.to_hu_conv_name is not None:
 997                 out_java_struct += ("\t\treturn " + return_type_info.to_hu_conv_name + ";\n")
 998             elif return_type_info.java_ty != "void" and return_type_info.rust_obj != "LDK" + struct_meth:
 999                 out_java_struct += ("\t\treturn ret;\n")
1000             out_java_struct += ("\t}\n\n")
1001
1002         return (out_java, out_c, out_java_struct)