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

   1 from bindingstypes import *
   2
   3 class Consts:
   4     def __init__(self, DEBUG: bool, **kwargs):
   5         self.c_array_class_caches = set()
   6         self.c_type_map = dict(
   7             uint8_t = ['byte'],
   8             uint16_t = ['short'],
   9             uint32_t = ['int'],
  10             uint64_t = ['long'],
  11         )
  12
  13         self.to_hu_conv_templates = dict(
  14             ptr = '{human_type} {var_name}_hu_conv = new {human_type}(null, {var_name});',
  15             default = '{human_type} {var_name}_hu_conv = new {human_type}(null, {var_name});'
  16         )
  17
  18         self.bindings_header = """package org.ldk.impl;
  19 import org.ldk.enums.*;
  20
  21 public class bindings {
  22         public static class VecOrSliceDef {
  23                 public long dataptr;
  24                 public long datalen;
  25                 public long stride;
  26                 public VecOrSliceDef(long dataptr, long datalen, long stride) {
  27                         this.dataptr = dataptr; this.datalen = datalen; this.stride = stride;
  28                 }
  29         }
  30         static {
  31                 System.loadLibrary(\"lightningjni\");
  32                 init(java.lang.Enum.class, VecOrSliceDef.class);
  33                 init_class_cache();
  34         }
  35         static native void init(java.lang.Class c, java.lang.Class slicedef);
  36         static native void init_class_cache();
  37
  38         public static native boolean deref_bool(long ptr);
  39         public static native long deref_long(long ptr);
  40         public static native void free_heap_ptr(long ptr);
  41         public static native byte[] read_bytes(long ptr, long len);
  42         public static native byte[] get_u8_slice_bytes(long slice_ptr);
  43         public static native long bytes_to_u8_vec(byte[] bytes);
  44         public static native long new_txpointer_copy_data(byte[] txdata);
  45         public static native void txpointer_free(long ptr);
  46         public static native byte[] txpointer_get_buffer(long ptr);
  47         public static native long vec_slice_len(long vec);
  48         public static native long new_empty_slice_vec();
  49
  50 """
  51
  52         self.bindings_footer = "}\n"
  53
  54         self.common_base = """package org.ldk.structs;
  55 import java.util.LinkedList;
  56 class CommonBase {
  57         final long ptr;
  58         LinkedList<Object> ptrs_to = new LinkedList();
  59         protected CommonBase(long ptr) { this.ptr = ptr; }
  60         public long _test_only_get_ptr() { return this.ptr; }
  61 }
  62 """
  63
  64         self.c_file_pfx = """#include \"org_ldk_impl_bindings.h\"
  65 #include <rust_types.h>
  66 #include <lightning.h>
  67 #include <string.h>
  68 #include <stdatomic.h>
  69 #include <stdlib.h>
  70
  71 """
  72
  73         if not DEBUG:
  74             self.c_file_pfx = self.c_file_pfx + """#define MALLOC(a, _) malloc(a)
  75 #define FREE(p) if ((long)(p) > 1024) { free(p); }
  76 #define DO_ASSERT(a) (void)(a)
  77 #define CHECK(a)
  78 """
  79         else:
  80             self.c_file_pfx = self.c_file_pfx + """#include <assert.h>
  81 // Always run a, then assert it is true:
  82 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
  83 // Assert a is true or do nothing
  84 #define CHECK(a) DO_ASSERT(a)
  85
  86 // Running a leak check across all the allocations and frees of the JDK is a mess,
  87 // so instead we implement our own naive leak checker here, relying on the -wrap
  88 // linker option to wrap malloc/calloc/realloc/free, tracking everyhing allocated
  89 // and free'd in Rust or C across the generated bindings shared library.
  90 #include <threads.h>
  91 #include <execinfo.h>
  92 #include <unistd.h>
  93 static mtx_t allocation_mtx;
  94
  95 void __attribute__((constructor)) init_mtx() {
  96         DO_ASSERT(mtx_init(&allocation_mtx, mtx_plain) == thrd_success);
  97 }
  98
  99 #define BT_MAX 128
 100 typedef struct allocation {
 101         struct allocation* next;
 102         void* ptr;
 103         const char* struct_name;
 104         void* bt[BT_MAX];
 105         int bt_len;
 106 } allocation;
 107 static allocation* allocation_ll = NULL;
 108
 109 void* __real_malloc(size_t len);
 110 void* __real_calloc(size_t nmemb, size_t len);
 111 static void new_allocation(void* res, const char* struct_name) {
 112         allocation* new_alloc = __real_malloc(sizeof(allocation));
 113         new_alloc->ptr = res;
 114         new_alloc->struct_name = struct_name;
 115         new_alloc->bt_len = backtrace(new_alloc->bt, BT_MAX);
 116         DO_ASSERT(mtx_lock(&allocation_mtx) == thrd_success);
 117         new_alloc->next = allocation_ll;
 118         allocation_ll = new_alloc;
 119         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
 120 }
 121 static void* MALLOC(size_t len, const char* struct_name) {
 122         void* res = __real_malloc(len);
 123         new_allocation(res, struct_name);
 124         return res;
 125 }
 126 void __real_free(void* ptr);
 127 static void alloc_freed(void* ptr) {
 128         allocation* p = NULL;
 129         DO_ASSERT(mtx_lock(&allocation_mtx) == thrd_success);
 130         allocation* it = allocation_ll;
 131         while (it->ptr != ptr) {
 132                 p = it; it = it->next;
 133                 if (it == NULL) {
 134                         fprintf(stderr, "Tried to free unknown pointer %p at:\\n", ptr);
 135                         void* bt[BT_MAX];
 136                         int bt_len = backtrace(bt, BT_MAX);
 137                         backtrace_symbols_fd(bt, bt_len, STDERR_FILENO);
 138                         fprintf(stderr, "\\n\\n");
 139                         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
 140                         return; // addrsan should catch malloc-unknown and print more info than we have
 141                 }
 142         }
 143         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
 144         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
 145         DO_ASSERT(it->ptr == ptr);
 146         __real_free(it);
 147 }
 148 static void FREE(void* ptr) {
 149         if ((long)ptr < 1024) return; // Rust loves to create pointers to the NULL page for dummys
 150         alloc_freed(ptr);
 151         __real_free(ptr);
 152 }
 153
 154 void* __wrap_malloc(size_t len) {
 155         void* res = __real_malloc(len);
 156         new_allocation(res, "malloc call");
 157         return res;
 158 }
 159 void* __wrap_calloc(size_t nmemb, size_t len) {
 160         void* res = __real_calloc(nmemb, len);
 161         new_allocation(res, "calloc call");
 162         return res;
 163 }
 164 void __wrap_free(void* ptr) {
 165         if (ptr == NULL) return;
 166         alloc_freed(ptr);
 167         __real_free(ptr);
 168 }
 169
 170 void* __real_realloc(void* ptr, size_t newlen);
 171 void* __wrap_realloc(void* ptr, size_t len) {
 172         if (ptr != NULL) alloc_freed(ptr);
 173         void* res = __real_realloc(ptr, len);
 174         new_allocation(res, "realloc call");
 175         return res;
 176 }
 177 void __wrap_reallocarray(void* ptr, size_t new_sz) {
 178         // Rust doesn't seem to use reallocarray currently
 179         DO_ASSERT(false);
 180 }
 181
 182 void __attribute__((destructor)) check_leaks() {
 183         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 184                 fprintf(stderr, "%s %p remains:\\n", a->struct_name, a->ptr);
 185                 backtrace_symbols_fd(a->bt, a->bt_len, STDERR_FILENO);
 186                 fprintf(stderr, "\\n\\n");
 187         }
 188         DO_ASSERT(allocation_ll == NULL);
 189 }
 190 """
 191         self.c_file_pfx = self.c_file_pfx + """
 192 static jmethodID ordinal_meth = NULL;
 193 static jmethodID slicedef_meth = NULL;
 194 static jclass slicedef_cls = NULL;
 195 JNIEXPORT void Java_org_ldk_impl_bindings_init(JNIEnv * env, jclass _b, jclass enum_class, jclass slicedef_class) {
 196         ordinal_meth = (*env)->GetMethodID(env, enum_class, "ordinal", "()I");
 197         CHECK(ordinal_meth != NULL);
 198         slicedef_meth = (*env)->GetMethodID(env, slicedef_class, "<init>", "(JJJ)V");
 199         CHECK(slicedef_meth != NULL);
 200         slicedef_cls = (*env)->NewGlobalRef(env, slicedef_class);
 201         CHECK(slicedef_cls != NULL);
 202 }
 203
 204 JNIEXPORT jboolean JNICALL Java_org_ldk_impl_bindings_deref_1bool (JNIEnv * env, jclass _a, jlong ptr) {
 205         return *((bool*)ptr);
 206 }
 207 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_deref_1long (JNIEnv * env, jclass _a, jlong ptr) {
 208         return *((long*)ptr);
 209 }
 210 JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_free_1heap_1ptr (JNIEnv * env, jclass _a, jlong ptr) {
 211         FREE((void*)ptr);
 212 }
 213 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_read_1bytes (JNIEnv * env, jclass _b, jlong ptr, jlong len) {
 214         jbyteArray ret_arr = (*env)->NewByteArray(env, len);
 215         (*env)->SetByteArrayRegion(env, ret_arr, 0, len, (unsigned char*)ptr);
 216         return ret_arr;
 217 }
 218 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_get_1u8_1slice_1bytes (JNIEnv * env, jclass _b, jlong slice_ptr) {
 219         LDKu8slice *slice = (LDKu8slice*)slice_ptr;
 220         jbyteArray ret_arr = (*env)->NewByteArray(env, slice->datalen);
 221         (*env)->SetByteArrayRegion(env, ret_arr, 0, slice->datalen, slice->data);
 222         return ret_arr;
 223 }
 224 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_bytes_1to_1u8_1vec (JNIEnv * env, jclass _b, jbyteArray bytes) {
 225         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "LDKCVec_u8");
 226         vec->datalen = (*env)->GetArrayLength(env, bytes);
 227         vec->data = (uint8_t*)MALLOC(vec->datalen, "LDKCVec_u8Z Bytes");
 228         (*env)->GetByteArrayRegion (env, bytes, 0, vec->datalen, vec->data);
 229         return (long)vec;
 230 }
 231 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_txpointer_1get_1buffer (JNIEnv * env, jclass _b, jlong ptr) {
 232         LDKTransaction *txdata = (LDKTransaction*)ptr;
 233         LDKu8slice slice;
 234         slice.data = txdata->data;
 235         slice.datalen = txdata->datalen;
 236         return Java_org_ldk_impl_bindings_get_1u8_1slice_1bytes(env, _b, (long)&slice);
 237 }
 238 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_new_1txpointer_1copy_1data (JNIEnv * env, jclass _b, jbyteArray bytes) {
 239         LDKTransaction *txdata = (LDKTransaction*)MALLOC(sizeof(LDKTransaction), "LDKTransaction");
 240         txdata->datalen = (*env)->GetArrayLength(env, bytes);
 241         txdata->data = (uint8_t*)MALLOC(txdata->datalen, "Tx Data Bytes");
 242         txdata->data_is_owned = false;
 243         (*env)->GetByteArrayRegion (env, bytes, 0, txdata->datalen, txdata->data);
 244         return (long)txdata;
 245 }
 246 JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_txpointer_1free (JNIEnv * env, jclass _b, jlong ptr) {
 247         LDKTransaction *tx = (LDKTransaction*)ptr;
 248         tx->data_is_owned = true;
 249         Transaction_free(*tx);
 250         FREE((void*)ptr);
 251 }
 252 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_vec_1slice_1len (JNIEnv * env, jclass _a, jlong ptr) {
 253         // Check offsets of a few Vec types are all consistent as we're meant to be generic across types
 254         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_SignatureZ, datalen), "Vec<*> needs to be mapped identically");
 255         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_MessageSendEventZ, datalen), "Vec<*> needs to be mapped identically");
 256         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_EventZ, datalen), "Vec<*> needs to be mapped identically");
 257         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_C2Tuple_usizeTransactionZZ, datalen), "Vec<*> needs to be mapped identically");
 258         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)ptr;
 259         return (long)vec->datalen;
 260 }
 261 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_new_1empty_1slice_1vec (JNIEnv * env, jclass _b) {
 262         // Check sizes of a few Vec types are all consistent as we're meant to be generic across types
 263         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_SignatureZ), "Vec<*> needs to be mapped identically");
 264         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_MessageSendEventZ), "Vec<*> needs to be mapped identically");
 265         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_EventZ), "Vec<*> needs to be mapped identically");
 266         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_C2Tuple_usizeTransactionZZ), "Vec<*> needs to be mapped identically");
 267         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "Empty LDKCVec");
 268         vec->data = NULL;
 269         vec->datalen = 0;
 270         return (long)vec;
 271 }
 272
 273 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
 274 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
 275 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
 276 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
 277
 278 _Static_assert(sizeof(jlong) == sizeof(int64_t), "We assume that j-types are the same as C types");
 279 _Static_assert(sizeof(jbyte) == sizeof(char), "We assume that j-types are the same as C types");
 280 _Static_assert(sizeof(void*) <= 8, "Pointers must fit into 64 bits");
 281
 282 typedef jlongArray int64_tArray;
 283 typedef jbyteArray int8_tArray;
 284
 285 static inline jstring str_ref_to_java(JNIEnv *env, const char* chars, size_t len) {
 286         // Sadly we need to create a temporary because Java can't accept a char* without a 0-terminator
 287         char* err_buf = MALLOC(len + 1, "str conv buf");
 288         memcpy(err_buf, chars, len);
 289         err_buf[len] = 0;
 290         jstring err_conv = (*env)->NewStringUTF(env, chars);
 291         FREE(err_buf);
 292         return err_conv;
 293 }
 294 """
 295
 296         self.hu_struct_file_prefix = """package org.ldk.structs;
 297
 298 import org.ldk.impl.bindings;
 299 import org.ldk.enums.*;
 300 import org.ldk.util.*;
 301 import java.util.Arrays;
 302
 303 @SuppressWarnings("unchecked") // We correctly assign various generic arrays
 304 """
 305         self.c_fn_ty_pfx = "JNIEXPORT "
 306         self.c_fn_args_pfx = "JNIEnv *env, jclass clz"
 307         self.file_ext = ".java"
 308         self.ptr_c_ty = "int64_t"
 309         self.ptr_native_ty = "long"
 310         self.result_c_ty = "jclass"
 311         self.ptr_arr = "jobjectArray"
 312         self.get_native_arr_len_call = ("(*env)->GetArrayLength(env, ", ")")
 313
 314     def release_native_arr_ptr_call(self, ty_info, arr_var, arr_ptr_var):
 315         if ty_info.subty is None or not ty_info.subty.c_ty.endswith("Array"):
 316             return "(*env)->ReleasePrimitiveArrayCritical(env, " + arr_var + ", " + arr_ptr_var + ", 0)"
 317         return None
 318     def create_native_arr_call(self, arr_len, ty_info):
 319         if ty_info.c_ty == "int8_tArray":
 320             return "(*env)->NewByteArray(env, " + arr_len + ")"
 321         elif ty_info.subty.c_ty.endswith("Array"):
 322             clz_var = ty_info.java_fn_ty_arg[1:].replace("[", "arr_of_")
 323             self.c_array_class_caches.add(clz_var)
 324             return "(*env)->NewObjectArray(env, " + arr_len + ", " + clz_var + "_clz, NULL);\n"
 325         else:
 326             return "(*env)->New" + ty_info.java_ty.strip("[]").title() + "Array(env, " + arr_len + ")"
 327     def set_native_arr_contents(self, arr_name, arr_len, ty_info):
 328         if ty_info.c_ty == "int8_tArray":
 329             return ("(*env)->SetByteArrayRegion(env, " + arr_name + ", 0, " + arr_len + ", ", ")")
 330         else:
 331             assert False
 332     def get_native_arr_contents(self, arr_name, dest_name, arr_len, ty_info, copy):
 333         if ty_info.c_ty == "int8_tArray":
 334             if copy:
 335                 return "(*env)->GetByteArrayRegion(env, " + arr_name + ", 0, " + arr_len + ", " + dest_name + ")"
 336             else:
 337                 return "(*env)->GetByteArrayElements (env, " + arr_name + ", NULL)"
 338         elif not ty_info.java_ty[:len(ty_info.java_ty) - 2].endswith("[]"):
 339             return "(*env)->Get" + ty_info.subty.java_ty.title() + "ArrayElements (env, " + arr_name + ", NULL)"
 340         else:
 341             return None
 342     def get_native_arr_elem(self, arr_name, idxc, ty_info):
 343         if self.get_native_arr_contents(arr_name, "", "", ty_info, False) is None:
 344             return "(*env)->GetObjectArrayElement(env, " + arr_name + ", " + idxc + ")"
 345         else:
 346             assert False # Only called if above is None
 347     def get_native_arr_ptr_call(self, ty_info):
 348         if ty_info.subty is not None and ty_info.subty.c_ty.endswith("Array"):
 349             return None
 350         return ("(*env)->GetPrimitiveArrayCritical(env, ", ", NULL)")
 351     def get_native_arr_entry_call(self, ty_info, arr_name, idxc, entry_access):
 352         if ty_info.subty is None or not ty_info.subty.c_ty.endswith("Array"):
 353             return None
 354         return "(*env)->SetObjectArrayElement(env, " + arr_name + ", " + idxc + ", " + entry_access + ")"
 355     def cleanup_native_arr_ref_contents(self, arr_name, dest_name, arr_len, ty_info):
 356         if ty_info.c_ty == "int8_tArray":
 357             return "(*env)->ReleaseByteArrayElements(env, " + arr_name + ", (int8_t*)" + dest_name + ", 0);"
 358         else:
 359             return "(*env)->Release" + ty_info.java_ty.strip("[]").title() + "ArrayElements(env, " + arr_name + ", " + dest_name + ", 0)"
 360
 361     def str_ref_to_c_call(self, var_name, str_len):
 362         return "str_ref_to_java(env, " + var_name + ", " + str_len + ")"
 363
 364     def c_fn_name_define_pfx(self, fn_name, has_args):
 365         if has_args:
 366             return "JNICALL Java_org_ldk_impl_bindings_" + fn_name.replace("_", "_1") + "(JNIEnv *env, jclass clz, "
 367         return "JNICALL Java_org_ldk_impl_bindings_" + fn_name.replace("_", "_1") + "(JNIEnv *env, jclass clz"
 368
 369     def init_str(self):
 370         res = ""
 371         for ty in self.c_array_class_caches:
 372             res = res + "static jclass " + ty + "_clz = NULL;\n"
 373         res = res + "JNIEXPORT void Java_org_ldk_impl_bindings_init_1class_1cache(JNIEnv * env, jclass clz) {\n"
 374         for ty in self.c_array_class_caches:
 375             res = res + "\t" + ty + "_clz = (*env)->FindClass(env, \"" + ty.replace("arr_of_", "[") + "\");\n"
 376             res = res + "\tCHECK(" + ty + "_clz != NULL);\n"
 377             res = res + "\t" + ty + "_clz = (*env)->NewGlobalRef(env, " + ty + "_clz);\n"
 378         res = res + "}\n"
 379         return res
 380
 381     def native_c_unitary_enum_map(self, struct_name, variants):
 382         out_java_enum = "package org.ldk.enums;\n\n"
 383         out_java = ""
 384         out_c = ""
 385         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_from_java(" + self.c_fn_args_pfx + ") {\n"
 386         out_c = out_c + "\tswitch ((*env)->CallIntMethod(env, clz, ordinal_meth)) {\n"
 387
 388         out_java_enum = out_java_enum + "public enum " + struct_name + " {\n"
 389         ord_v = 0
 390         for var in variants:
 391             out_java_enum = out_java_enum + "\t" + var + ",\n"
 392             out_c = out_c + "\t\tcase %d: return %s;\n" % (ord_v, var)
 393             ord_v = ord_v + 1
 394         out_java_enum = out_java_enum + "\t; static native void init();\n"
 395         out_java_enum = out_java_enum + "\tstatic { init(); }\n"
 396         out_java_enum = out_java_enum + "}"
 397         out_java = out_java + "\tstatic { " + struct_name + ".values(); /* Force enum statics to run */ }\n"
 398         out_c = out_c + "\t}\n"
 399         out_c = out_c + "\tabort();\n"
 400         out_c = out_c + "}\n"
 401
 402         out_c = out_c + "static jclass " + struct_name + "_class = NULL;\n"
 403         for var in variants:
 404             out_c = out_c + "static jfieldID " + struct_name + "_" + var + " = NULL;\n"
 405         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"
 406         out_c = out_c + "\t" + struct_name + "_class = (*env)->NewGlobalRef(env, clz);\n"
 407         out_c = out_c + "\tCHECK(" + struct_name + "_class != NULL);\n"
 408         for var in variants:
 409             out_c = out_c + "\t" + struct_name + "_" + var + " = (*env)->GetStaticFieldID(env, " + struct_name + "_class, \"" + var + "\", \"Lorg/ldk/enums/" + struct_name + ";\");\n"
 410             out_c = out_c + "\tCHECK(" + struct_name + "_" + var + " != NULL);\n"
 411         out_c = out_c + "}\n"
 412         out_c = out_c + "static inline jclass " + struct_name + "_to_java(JNIEnv *env, " + struct_name + " val) {\n"
 413         out_c = out_c + "\tswitch (val) {\n"
 414         ord_v = 0
 415         for var in variants:
 416             out_c = out_c + "\t\tcase " + var + ":\n"
 417             out_c = out_c + "\t\t\treturn (*env)->GetStaticObjectField(env, " + struct_name + "_class, " + struct_name + "_" + var + ");\n"
 418             ord_v = ord_v + 1
 419         out_c = out_c + "\t\tdefault: abort();\n"
 420         out_c = out_c + "\t}\n"
 421         out_c = out_c + "}\n\n"
 422
 423         return (out_c, out_java_enum, out_java)
 424
 425     def c_unitary_enum_to_native_call(self, ty_info):
 426         return (ty_info.rust_obj + "_to_java(env, ", ")")
 427     def native_unitary_enum_to_c_call(self, ty_info):
 428         return (ty_info.rust_obj + "_from_java(env, ", ")")
 429
 430     def c_complex_enum_pfx(self, struct_name, variants, init_meth_jty_strs):
 431         out_c = ""
 432         for var in variants:
 433             out_c = out_c + "static jclass " + struct_name + "_" + var + "_class = NULL;\n"
 434             out_c = out_c + "static jmethodID " + struct_name + "_" + var + "_meth = NULL;\n"
 435         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"
 436         for var_name in variants:
 437             out_c = out_c + "\t" + struct_name + "_" + var_name + "_class =\n"
 438             out_c = out_c + "\t\t(*env)->NewGlobalRef(env, (*env)->FindClass(env, \"Lorg/ldk/impl/bindings$" + struct_name + "$" + var_name + ";\"));\n"
 439             out_c = out_c + "\tCHECK(" + struct_name + "_" + var_name + "_class != NULL);\n"
 440             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"
 441             out_c = out_c + "\tCHECK(" + struct_name + "_" + var_name + "_meth != NULL);\n"
 442         out_c = out_c + "}\n"
 443         return out_c
 444
 445     def c_complex_enum_pass_ty(self, struct_name):
 446         return "jobject"
 447
 448     def c_constr_native_complex_enum(self, struct_name, variant, c_params):
 449         ret = "(*env)->NewObject(env, " + struct_name + "_" + variant + "_class, " + struct_name + "_" + variant + "_meth"
 450         for param in c_params:
 451             ret = ret + ", " + param
 452         return ret + ")"
 453
 454     def native_c_map_trait(self, struct_name, field_vars, field_fns):
 455         out_java_trait = ""
 456         out_java = ""
 457
 458         # First generate most of the Java code, note that we need information about java method argument strings for C
 459         out_java_trait = out_java_trait + self.hu_struct_file_prefix
 460         out_java_trait = out_java_trait + "public class " + struct_name.replace("LDK","") + " extends CommonBase {\n"
 461         out_java_trait = out_java_trait + "\tfinal bindings." + struct_name + " bindings_instance;\n"
 462         out_java_trait = out_java_trait + "\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); bindings_instance = null; }\n"
 463         out_java_trait = out_java_trait + "\tprivate " + struct_name.replace("LDK", "") + "(bindings." + struct_name + " arg"
 464         for var in field_vars:
 465             if isinstance(var, ConvInfo):
 466                 out_java_trait = out_java_trait + ", " + var.java_hu_ty + " " + var.arg_name
 467             else:
 468                 out_java_trait = out_java_trait + ", bindings." + var[0] + " " + var[1]
 469         out_java_trait = out_java_trait + ") {\n"
 470         out_java_trait = out_java_trait + "\t\tsuper(bindings." + struct_name + "_new(arg"
 471         for var in field_vars:
 472             if isinstance(var, ConvInfo):
 473                 if var.from_hu_conv is not None:
 474                     out_java_trait = out_java_trait + ", " + var.from_hu_conv[0]
 475                 else:
 476                     out_java_trait = out_java_trait + ", " + var.arg_name
 477             else:
 478                 out_java_trait = out_java_trait + ", " + var[1]
 479         out_java_trait = out_java_trait + "));\n"
 480         out_java_trait = out_java_trait + "\t\tthis.ptrs_to.add(arg);\n"
 481         for var in field_vars:
 482             if isinstance(var, ConvInfo):
 483                 if var.from_hu_conv is not None and var.from_hu_conv[1] != "":
 484                     out_java_trait = out_java_trait + "\t\t" + var.from_hu_conv[1] + ";\n"
 485             else:
 486                 out_java_trait = out_java_trait + "\t\tthis.ptrs_to.add(" + var[1] + ");\n"
 487         out_java_trait = out_java_trait + "\t\tthis.bindings_instance = arg;\n"
 488         out_java_trait = out_java_trait + "\t}\n"
 489         out_java_trait = out_java_trait + "\t@Override @SuppressWarnings(\"deprecation\")\n"
 490         out_java_trait = out_java_trait + "\tprotected void finalize() throws Throwable {\n"
 491         out_java_trait = out_java_trait + "\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); } super.finalize();\n"
 492         out_java_trait = out_java_trait + "\t}\n\n"
 493
 494         java_trait_constr = "\tprivate static class " + struct_name + "Holder { " + struct_name.replace("LDK", "") + " held; }\n"
 495         java_trait_constr = java_trait_constr + "\tpublic static " + struct_name.replace("LDK", "") + " new_impl(" + struct_name.replace("LDK", "") + "Interface arg"
 496         for var in field_vars:
 497             if isinstance(var, ConvInfo):
 498                 java_trait_constr = java_trait_constr + ", " + var.java_hu_ty + " " + var.arg_name
 499             else:
 500                 # Ideally we'd be able to take any instance of the interface, but our C code can only represent
 501                 # Java-implemented version, so we require users pass a Java implementation here :/
 502                 java_trait_constr = java_trait_constr + ", " + var[0].replace("LDK", "") + "." + var[0].replace("LDK", "") + "Interface " + var[1] + "_impl"
 503         java_trait_constr = java_trait_constr + ") {\n\t\tfinal " + struct_name + "Holder impl_holder = new " + struct_name + "Holder();\n"
 504         java_trait_constr = java_trait_constr + "\t\timpl_holder.held = new " + struct_name.replace("LDK", "") + "(new bindings." + struct_name + "() {\n"
 505         out_java_trait = out_java_trait + "\tpublic static interface " + struct_name.replace("LDK", "") + "Interface {\n"
 506         out_java = out_java + "\tpublic interface " + struct_name + " {\n"
 507         java_meths = []
 508         for fn_line in field_fns:
 509             java_meth_descr = "("
 510             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 511                 out_java = out_java + "\t\t " + fn_line.ret_ty_info.java_ty + " " + fn_line.fn_name + "("
 512                 java_trait_constr = java_trait_constr + "\t\t\t@Override public " + fn_line.ret_ty_info.java_ty + " " + fn_line.fn_name + "("
 513                 out_java_trait = out_java_trait + "\t\t" + fn_line.ret_ty_info.java_hu_ty + " " + fn_line.fn_name + "("
 514
 515                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 516                     if idx >= 1:
 517                         out_java = out_java + ", "
 518                         java_trait_constr = java_trait_constr + ", "
 519                         out_java_trait = out_java_trait + ", "
 520                     out_java = out_java + arg_conv_info.java_ty + " " + arg_conv_info.arg_name
 521                     out_java_trait = out_java_trait + arg_conv_info.java_hu_ty + " " + arg_conv_info.arg_name
 522                     java_trait_constr = java_trait_constr + arg_conv_info.java_ty + " " + arg_conv_info.arg_name
 523                     java_meth_descr = java_meth_descr + arg_conv_info.java_fn_ty_arg
 524                 java_meth_descr = java_meth_descr + ")" + fn_line.ret_ty_info.java_fn_ty_arg
 525                 java_meths.append((fn_line.fn_name, java_meth_descr))
 526
 527                 out_java = out_java + ");\n"
 528                 out_java_trait = out_java_trait + ");\n"
 529                 java_trait_constr = java_trait_constr + ") {\n"
 530
 531                 for arg_info in fn_line.args_ty:
 532                     if arg_info.to_hu_conv is not None:
 533                         java_trait_constr = java_trait_constr + "\t\t\t\t" + arg_info.to_hu_conv.replace("\n", "\n\t\t\t\t") + "\n"
 534
 535                 if fn_line.ret_ty_info.java_ty != "void":
 536                     java_trait_constr = java_trait_constr + "\t\t\t\t" + fn_line.ret_ty_info.java_hu_ty + " ret = arg." + fn_line.fn_name + "("
 537                 else:
 538                     java_trait_constr = java_trait_constr + "\t\t\t\targ." + fn_line.fn_name + "("
 539
 540                 for idx, arg_info in enumerate(fn_line.args_ty):
 541                     if idx != 0:
 542                         java_trait_constr = java_trait_constr + ", "
 543                     if arg_info.to_hu_conv_name is not None:
 544                         java_trait_constr = java_trait_constr + arg_info.to_hu_conv_name
 545                     else:
 546                         java_trait_constr = java_trait_constr + arg_info.arg_name
 547
 548                 java_trait_constr = java_trait_constr + ");\n"
 549                 if fn_line.ret_ty_info.java_ty != "void":
 550                     if fn_line.ret_ty_info.from_hu_conv is not None:
 551                         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"
 552                         if fn_line.ret_ty_info.from_hu_conv[1] != "":
 553                             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"
 554                         #if fn_line.ret_ty_info.rust_obj in result_types:
 555                         java_trait_constr = java_trait_constr + "\t\t\t\treturn result;\n"
 556                     else:
 557                         java_trait_constr = java_trait_constr + "\t\t\t\treturn ret;\n"
 558                 java_trait_constr = java_trait_constr + "\t\t\t}\n"
 559         java_trait_constr = java_trait_constr + "\t\t}"
 560         for var in field_vars:
 561             if isinstance(var, ConvInfo):
 562                 java_trait_constr = java_trait_constr + ", " + var.arg_name
 563             else:
 564                 java_trait_constr = java_trait_constr + ", " + var[1] + ".new_impl(" + var[1] + "_impl).bindings_instance"
 565         out_java_trait = out_java_trait + "\t}\n"
 566         out_java_trait = out_java_trait + java_trait_constr + ");\n\t\treturn impl_holder.held;\n\t}\n"
 567
 568         out_java = out_java + "\t}\n"
 569
 570         out_java = out_java + "\tpublic static native long " + struct_name + "_new(" + struct_name + " impl"
 571         for var in field_vars:
 572             if isinstance(var, ConvInfo):
 573                 out_java = out_java + ", " + var.java_ty + " " + var.arg_name
 574             else:
 575                 out_java = out_java + ", " + var[0] + " " + var[1]
 576         out_java = out_java + ");\n"
 577
 578         # Now that we've written out our java code (and created java_meths), generate C
 579         out_c = "typedef struct " + struct_name + "_JCalls {\n"
 580         out_c = out_c + "\tatomic_size_t refcnt;\n"
 581         out_c = out_c + "\tJavaVM *vm;\n"
 582         out_c = out_c + "\tjweak o;\n"
 583         for var in field_vars:
 584             if isinstance(var, ConvInfo):
 585                 # We're a regular ol' field
 586                 pass
 587             else:
 588                 # We're a supertrait
 589                 out_c = out_c + "\t" + var[0] + "_JCalls* " + var[1] + ";\n"
 590         for fn in field_fns:
 591             if fn.fn_name != "free" and fn.fn_name != "clone":
 592                 out_c = out_c + "\tjmethodID " + fn.fn_name + "_meth;\n"
 593         out_c = out_c + "} " + struct_name + "_JCalls;\n"
 594
 595         for fn_line in field_fns:
 596             if fn_line.fn_name == "free":
 597                 out_c = out_c + "static void " + struct_name + "_JCalls_free(void* this_arg) {\n"
 598                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 599                 out_c = out_c + "\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n"
 600                 out_c = out_c + "\t\tJNIEnv *env;\n"
 601                 out_c = out_c + "\t\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_8) == JNI_OK);\n"
 602                 out_c = out_c + "\t\t(*env)->DeleteWeakGlobalRef(env, j_calls->o);\n"
 603                 out_c = out_c + "\t\tFREE(j_calls);\n"
 604                 out_c = out_c + "\t}\n}\n"
 605
 606         for idx, fn_line in enumerate(field_fns):
 607             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 608                 assert fn_line.ret_ty_info.ty_info.get_full_rust_ty()[1] == ""
 609                 out_c = out_c + fn_line.ret_ty_info.ty_info.get_full_rust_ty()[0] + " " + fn_line.fn_name + "_jcall("
 610                 if fn_line.self_is_const:
 611                     out_c = out_c + "const void* this_arg"
 612                 else:
 613                     out_c = out_c + "void* this_arg"
 614
 615                 for idx, arg in enumerate(fn_line.args_ty):
 616                     out_c = out_c + ", " + arg.ty_info.get_full_rust_ty()[0] + " " + arg.arg_name + arg.ty_info.get_full_rust_ty()[1]
 617
 618                 out_c = out_c + ") {\n"
 619                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 620                 out_c = out_c + "\tJNIEnv *env;\n"
 621                 out_c = out_c + "\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_8) == JNI_OK);\n"
 622
 623                 for arg_info in fn_line.args_ty:
 624                     if arg_info.ret_conv is not None:
 625                         out_c = out_c + "\t" + arg_info.ret_conv[0].replace('\n', '\n\t')
 626                         out_c = out_c + arg_info.arg_name
 627                         out_c = out_c + arg_info.ret_conv[1].replace('\n', '\n\t') + "\n"
 628
 629                 out_c = out_c + "\tjobject obj = (*env)->NewLocalRef(env, j_calls->o);\n\tCHECK(obj != NULL);\n"
 630                 if fn_line.ret_ty_info.c_ty.endswith("Array"):
 631                     out_c = out_c + "\t" + fn_line.ret_ty_info.c_ty + " arg = (*env)->CallObjectMethod(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 632                 elif not fn_line.ret_ty_info.passed_as_ptr:
 633                     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"
 634                 else:
 635                     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"
 636
 637                 for idx, arg_info in enumerate(fn_line.args_ty):
 638                     if arg_info.ret_conv is not None:
 639                         out_c = out_c + ", " + arg_info.ret_conv_name
 640                     else:
 641                         out_c = out_c + ", " + arg_info.arg_name
 642                 out_c = out_c + ");\n"
 643                 if fn_line.ret_ty_info.arg_conv is not None:
 644                     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"
 645
 646                 out_c = out_c + "}\n"
 647
 648         # Write out a clone function whether we need one or not, as we use them in moving to rust
 649         out_c = out_c + "static void* " + struct_name + "_JCalls_clone(const void* this_arg) {\n"
 650         out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 651         out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n"
 652         for var in field_vars:
 653             if not isinstance(var, ConvInfo):
 654                 out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->" + var[1] + "->refcnt, 1, memory_order_release);\n"
 655         out_c = out_c + "\treturn (void*) this_arg;\n"
 656         out_c = out_c + "}\n"
 657
 658         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_init (" + self.c_fn_args_pfx + ", jobject o"
 659         for var in field_vars:
 660             if isinstance(var, ConvInfo):
 661                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 662             else:
 663                 out_c = out_c + ", jobject " + var[1]
 664         out_c = out_c + ") {\n"
 665
 666         out_c = out_c + "\tjclass c = (*env)->GetObjectClass(env, o);\n"
 667         out_c = out_c + "\tCHECK(c != NULL);\n"
 668         out_c = out_c + "\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n"
 669         out_c = out_c + "\tatomic_init(&calls->refcnt, 1);\n"
 670         out_c = out_c + "\tDO_ASSERT((*env)->GetJavaVM(env, &calls->vm) == 0);\n"
 671         out_c = out_c + "\tcalls->o = (*env)->NewWeakGlobalRef(env, o);\n"
 672
 673         for (fn_name, java_meth_descr) in java_meths:
 674             if fn_name != "free" and fn_name != "clone":
 675                 out_c = out_c + "\tcalls->" + fn_name + "_meth = (*env)->GetMethodID(env, c, \"" + fn_name + "\", \"" + java_meth_descr + "\");\n"
 676                 out_c = out_c + "\tCHECK(calls->" + fn_name + "_meth != NULL);\n"
 677
 678         for var in field_vars:
 679             if isinstance(var, ConvInfo) and var.arg_conv is not None:
 680                 out_c = out_c + "\n\t" + var.arg_conv.replace("\n", "\n\t") +"\n"
 681         out_c = out_c + "\n\t" + struct_name + " ret = {\n"
 682         out_c = out_c + "\t\t.this_arg = (void*) calls,\n"
 683         for fn_line in field_fns:
 684             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 685                 out_c = out_c + "\t\t." + fn_line.fn_name + " = " + fn_line.fn_name + "_jcall,\n"
 686             elif fn_line.fn_name == "free":
 687                 out_c = out_c + "\t\t.free = " + struct_name + "_JCalls_free,\n"
 688             else:
 689                 out_c = out_c + "\t\t.clone = " + struct_name + "_JCalls_clone,\n"
 690         for var in field_vars:
 691             if isinstance(var, ConvInfo):
 692                 if var.arg_conv_name is not None:
 693                     out_c = out_c + "\t\t." + var.arg_name + " = " + var.arg_conv_name + ",\n"
 694                     out_c = out_c + "\t\t.set_" + var.arg_name + " = NULL,\n"
 695                 else:
 696                     out_c = out_c + "\t\t." + var.var_name + " = " + var.var_name + ",\n"
 697                     out_c = out_c + "\t\t.set_" + var.var_name + " = NULL,\n"
 698             else:
 699                 out_c = out_c + "\t\t." + var[1] + " = " + var[0] + "_init(env, clz, " + var[1] + "),\n"
 700         out_c = out_c + "\t};\n"
 701         for var in field_vars:
 702             if not isinstance(var, ConvInfo):
 703                 out_c = out_c + "\tcalls->" + var[1] + " = ret." + var[1] + ".this_arg;\n"
 704         out_c = out_c + "\treturn ret;\n"
 705         out_c = out_c + "}\n"
 706
 707         out_c = out_c + self.c_fn_ty_pfx + "long " + self.c_fn_name_define_pfx(struct_name + "_new", True) + "jobject o"
 708         for var in field_vars:
 709             if isinstance(var, ConvInfo):
 710                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 711             else:
 712                 out_c = out_c + ", jobject " + var[1]
 713         out_c = out_c + ") {\n"
 714         out_c = out_c + "\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n"
 715         out_c = out_c + "\t*res_ptr = " + struct_name + "_init(env, clz, o"
 716         for var in field_vars:
 717             if isinstance(var, ConvInfo):
 718                 out_c = out_c + ", " + var.arg_name
 719             else:
 720                 out_c = out_c + ", " + var[1]
 721         out_c = out_c + ");\n"
 722         out_c = out_c + "\treturn (long)res_ptr;\n"
 723         out_c = out_c + "}\n"
 724
 725         return (out_java, out_java_trait, out_c)
 726
 727     def trait_struct_inc_refcnt(self, ty_info):
 728         base_conv = "\nif (" + ty_info.var_name + "_conv.free == " + ty_info.rust_obj + "_JCalls_free) {\n"
 729         base_conv = base_conv + "\t// If this_arg is a JCalls struct, then we need to increment the refcnt in it.\n"
 730         base_conv = base_conv + "\t" + ty_info.rust_obj + "_JCalls_clone(" + ty_info.var_name + "_conv.this_arg);\n}"
 731         return base_conv
 732
 733     def map_complex_enum(self, struct_name, variant_list, camel_to_snake):
 734         java_hu_type = struct_name.replace("LDK", "")
 735         out_java_enum = ""
 736         out_java = ""
 737         out_c = ""
 738
 739         out_java_enum += (self.hu_struct_file_prefix)
 740         out_java_enum += ("public class " + java_hu_type + " extends CommonBase {\n")
 741         out_java_enum += ("\tprivate " + java_hu_type + "(Object _dummy, long ptr) { super(ptr); }\n")
 742         out_java_enum += ("\t@Override @SuppressWarnings(\"deprecation\")\n")
 743         out_java_enum += ("\tprotected void finalize() throws Throwable {\n")
 744         out_java_enum += ("\t\tsuper.finalize();\n")
 745         out_java_enum += ("\t\tif (ptr != 0) { bindings." + java_hu_type + "_free(ptr); }\n")
 746         out_java_enum += ("\t}\n")
 747         out_java_enum += ("\tstatic " + java_hu_type + " constr_from_ptr(long ptr) {\n")
 748         out_java_enum += ("\t\tbindings." + struct_name + " raw_val = bindings." + struct_name + "_ref_from_ptr(ptr);\n")
 749         java_hu_subclasses = ""
 750
 751         init_meth_jty_strs = {}
 752
 753         out_java +=  ("\tpublic static class " + struct_name + " {\n")
 754         out_java +=  ("\t\tprivate " + struct_name + "() {}\n")
 755         for var in variant_list:
 756             out_java +=  ("\t\tpublic final static class " + var.var_name + " extends " + struct_name + " {\n")
 757             java_hu_subclasses = java_hu_subclasses + "\tpublic final static class " + var.var_name + " extends " + java_hu_type + " {\n"
 758             out_java_enum += ("\t\tif (raw_val.getClass() == bindings." + struct_name + "." + var.var_name + ".class) {\n")
 759             out_java_enum += ("\t\t\treturn new " + var.var_name + "(ptr, (bindings." + struct_name + "." + var.var_name + ")raw_val);\n")
 760             init_meth_jty_str = ""
 761             init_meth_params = ""
 762             init_meth_body = ""
 763             hu_conv_body = ""
 764             for idx, field_ty in enumerate(var.fields):
 765                 out_java += ("\t\t\tpublic " + field_ty.java_ty + " " + field_ty.arg_name + ";\n")
 766                 java_hu_subclasses = java_hu_subclasses + "\t\tpublic final " + field_ty.java_hu_ty + " " + field_ty.arg_name + ";\n"
 767                 if field_ty.to_hu_conv is not None:
 768                     hu_conv_body = hu_conv_body + "\t\t\t" + field_ty.java_ty + " " + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
 769                     hu_conv_body = hu_conv_body + "\t\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
 770                     hu_conv_body = hu_conv_body + "\t\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
 771                 else:
 772                     hu_conv_body = hu_conv_body + "\t\t\tthis." + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
 773                 init_meth_jty_str = init_meth_jty_str + field_ty.java_fn_ty_arg
 774                 if idx > 0:
 775                     init_meth_params = init_meth_params + ", "
 776                 init_meth_params = init_meth_params + field_ty.java_ty + " " + field_ty.arg_name
 777                 init_meth_body = init_meth_body + "this." + field_ty.arg_name + " = " + field_ty.arg_name + "; "
 778             out_java +=  ("\t\t\t" + var.var_name + "(" + init_meth_params + ") { ")
 779             out_java +=  (init_meth_body)
 780             out_java +=  ("}\n")
 781             out_java += ("\t\t}\n")
 782             out_java_enum += ("\t\t}\n")
 783             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"
 784             java_hu_subclasses = java_hu_subclasses + hu_conv_body
 785             java_hu_subclasses = java_hu_subclasses + "\t\t}\n\t}\n"
 786             init_meth_jty_strs[var.var_name] = init_meth_jty_str
 787         out_java += ("\t\tstatic native void init();\n")
 788         out_java += ("\t}\n")
 789         out_java_enum += ("\t\tassert false; return null; // Unreachable without extending the (internal) bindings interface\n\t}\n\n")
 790         out_java_enum += (java_hu_subclasses)
 791         out_java += ("\tstatic { " + struct_name + ".init(); }\n")
 792         out_java += ("\tpublic static native " + struct_name + " " + struct_name + "_ref_from_ptr(long ptr);\n");
 793
 794         out_c += (self.c_complex_enum_pfx(struct_name, [x.var_name for x in variant_list], init_meth_jty_strs))
 795
 796         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")
 797         out_c += ("\t" + struct_name + " *obj = (" + struct_name + "*)ptr;\n")
 798         out_c += ("\tswitch(obj->tag) {\n")
 799         for var in variant_list:
 800             out_c += ("\t\tcase " + struct_name + "_" + var.var_name + ": {\n")
 801             c_params = []
 802             for idx, field_map in enumerate(var.fields):
 803                 if field_map.ret_conv is not None:
 804                     out_c += ("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
 805                     out_c += ("obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name)
 806                     out_c += (field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
 807                     c_params.append(field_map.ret_conv_name)
 808                 else:
 809                     c_params.append("obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name)
 810             out_c += ("\t\t\treturn " + self.c_constr_native_complex_enum(struct_name, var.var_name, c_params) + ";\n")
 811             out_c += ("\t\t}\n")
 812         out_c += ("\t\tdefault: abort();\n")
 813         out_c += ("\t}\n}\n")
 814         out_java_enum += ("}\n")
 815         return (out_java, out_java_enum, out_c)
 816
 817     def map_opaque_struct(self, struct_name):
 818         out_opaque_struct_human = ""
 819         out_opaque_struct_human += self.hu_struct_file_prefix
 820         out_opaque_struct_human += ("public class " + struct_name.replace("LDK","") + " extends CommonBase")
 821         if struct_name.startswith("LDKLocked"):
 822             out_opaque_struct_human += (" implements AutoCloseable")
 823         out_opaque_struct_human += (" {\n")
 824         out_opaque_struct_human += ("\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); }\n")
 825         if struct_name.startswith("LDKLocked"):
 826             out_opaque_struct_human += ("\t@Override public void close() {\n")
 827         else:
 828             out_opaque_struct_human += ("\t@Override @SuppressWarnings(\"deprecation\")\n")
 829             out_opaque_struct_human += ("\tprotected void finalize() throws Throwable {\n")
 830             out_opaque_struct_human += ("\t\tsuper.finalize();\n")
 831         out_opaque_struct_human += ("\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); }\n")
 832         out_opaque_struct_human += ("\t}\n\n")
 833         return out_opaque_struct_human
 834
 835
 836     def map_function(self, argument_types, c_call_string, is_free, method_name, return_type_info, struct_meth, default_constructor_args, takes_self, args_known, has_out_java_struct: bool, type_mapping_generator):
 837         out_java = ""
 838         out_c = ""
 839         out_java_struct = None
 840
 841         out_java += ("\tpublic static native ")
 842         out_c += (self.c_fn_ty_pfx)
 843         out_c += (return_type_info.c_ty)
 844         out_java += (return_type_info.java_ty)
 845         if return_type_info.ret_conv is not None:
 846             ret_conv_pfx, ret_conv_sfx = return_type_info.ret_conv
 847         out_java += (" " + method_name + "(")
 848         have_args = len(argument_types) > 1 or (len(argument_types) > 0 and argument_types[0].c_ty != "void")
 849         out_c += (" " + self.c_fn_name_define_pfx(method_name, have_args))
 850
 851         for idx, arg_conv_info in enumerate(argument_types):
 852             if idx != 0:
 853                 out_java += (", ")
 854                 out_c += (", ")
 855             if arg_conv_info.c_ty != "void":
 856                 out_c += (arg_conv_info.c_ty + " " + arg_conv_info.arg_name)
 857                 out_java += (arg_conv_info.java_ty + " " + arg_conv_info.arg_name)
 858
 859         if has_out_java_struct:
 860             out_java_struct = ""
 861             if not args_known:
 862                 out_java_struct += ("\t// Skipped " + method_name + "\n")
 863                 has_out_java_struct = False
 864             else:
 865                 meth_n = method_name[len(struct_meth) + 1:]
 866                 if not takes_self:
 867                     out_java_struct += (
 868                         "\tpublic static " + return_type_info.java_hu_ty + " constructor_" + meth_n + "(")
 869                 else:
 870                     out_java_struct += ("\tpublic " + return_type_info.java_hu_ty + " " + meth_n + "(")
 871                 for idx, arg in enumerate(argument_types):
 872                     if idx != 0:
 873                         if not takes_self or idx > 1:
 874                             out_java_struct += (", ")
 875                     elif takes_self:
 876                         continue
 877                     if arg.java_ty != "void":
 878                         if arg.arg_name in default_constructor_args:
 879                             for explode_idx, explode_arg in enumerate(default_constructor_args[arg.arg_name]):
 880                                 if explode_idx != 0:
 881                                     out_java_struct += (", ")
 882                                 out_java_struct += (
 883                                     explode_arg.java_hu_ty + " " + arg.arg_name + "_" + explode_arg.arg_name)
 884                         else:
 885                             out_java_struct += (arg.java_hu_ty + " " + arg.arg_name)
 886         out_java += (");\n")
 887         out_c += (") {\n")
 888         if out_java_struct is not None:
 889             out_java_struct += (") {\n")
 890         for info in argument_types:
 891             if info.arg_conv is not None:
 892                 out_c += ("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
 893         if return_type_info.ret_conv is not None:
 894             out_c += ("\t" + ret_conv_pfx.replace('\n', '\n\t'))
 895         elif return_type_info.c_ty != "void":
 896             out_c += ("\t" + return_type_info.c_ty + " ret_val = ")
 897         else:
 898             out_c += ("\t")
 899         if c_call_string is None:
 900             out_c += (method_name + "(")
 901         else:
 902             out_c += (c_call_string)
 903         for idx, info in enumerate(argument_types):
 904             if info.arg_conv_name is not None:
 905                 if idx != 0:
 906                     out_c += (", ")
 907                 elif c_call_string is not None:
 908                     continue
 909                 out_c += (info.arg_conv_name)
 910         out_c += (")")
 911         if return_type_info.ret_conv is not None:
 912             out_c += (ret_conv_sfx.replace('\n', '\n\t'))
 913         else:
 914             out_c += (";")
 915         for info in argument_types:
 916             if info.arg_conv_cleanup is not None:
 917                 out_c += ("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
 918         if return_type_info.ret_conv is not None:
 919             out_c += ("\n\treturn " + return_type_info.ret_conv_name + ";")
 920         elif return_type_info.c_ty != "void":
 921             out_c += ("\n\treturn ret_val;")
 922         out_c += ("\n}\n\n")
 923
 924         if has_out_java_struct:
 925             out_java_struct += ("\t\t")
 926             if return_type_info.java_ty != "void":
 927                 out_java_struct += (return_type_info.java_ty + " ret = ")
 928             out_java_struct += ("bindings." + method_name + "(")
 929             for idx, info in enumerate(argument_types):
 930                 if idx != 0:
 931                     out_java_struct += (", ")
 932                 if idx == 0 and takes_self:
 933                     out_java_struct += ("this.ptr")
 934                 elif info.arg_name in default_constructor_args:
 935                     out_java_struct += ("bindings." + info.java_hu_ty + "_new(")
 936                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
 937                         if explode_idx != 0:
 938                             out_java_struct += (", ")
 939                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
 940                         if explode_arg.from_hu_conv is not None:
 941                             out_java_struct += (
 942                                 explode_arg.from_hu_conv[0].replace(explode_arg.arg_name, expl_arg_name))
 943                         else:
 944                             out_java_struct += (expl_arg_name)
 945                     out_java_struct += (")")
 946                 elif info.from_hu_conv is not None:
 947                     out_java_struct += (info.from_hu_conv[0])
 948                 else:
 949                     out_java_struct += (info.arg_name)
 950             out_java_struct += (");\n")
 951             if return_type_info.to_hu_conv is not None:
 952                 if not takes_self:
 953                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t").replace("this",
 954                                                                                                                return_type_info.to_hu_conv_name) + "\n")
 955                 else:
 956                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t") + "\n")
 957
 958             for idx, info in enumerate(argument_types):
 959                 if idx == 0 and takes_self:
 960                     pass
 961                 elif info.arg_name in default_constructor_args:
 962                     for explode_arg in default_constructor_args[info.arg_name]:
 963                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
 964                         if explode_arg.from_hu_conv is not None and return_type_info.to_hu_conv_name:
 965                             out_java_struct += ("\t\t" + explode_arg.from_hu_conv[1].replace(explode_arg.arg_name,
 966                                                                                                expl_arg_name).replace(
 967                                 "this", return_type_info.to_hu_conv_name) + ";\n")
 968                 elif info.from_hu_conv is not None and info.from_hu_conv[1] != "":
 969                     if not takes_self and return_type_info.to_hu_conv_name is not None:
 970                         out_java_struct += (
 971                             "\t\t" + info.from_hu_conv[1].replace("this", return_type_info.to_hu_conv_name) + ";\n")
 972                     else:
 973                         out_java_struct += ("\t\t" + info.from_hu_conv[1] + ";\n")
 974
 975             if return_type_info.to_hu_conv_name is not None:
 976                 out_java_struct += ("\t\treturn " + return_type_info.to_hu_conv_name + ";\n")
 977             elif return_type_info.java_ty != "void" and return_type_info.rust_obj != "LDK" + struct_meth:
 978                 out_java_struct += ("\t\treturn ret;\n")
 979             out_java_struct += ("\t}\n\n")
 980
 981         return (out_java, out_c, out_java_struct)