_ 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         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_name_pfx = "JNICALL Java_org_ldk_impl_bindings_"
 307         self.c_fn_args_pfx = "JNIEnv *env, jclass clz"
 308         self.file_ext = ".java"
 309         self.ptr_c_ty = "int64_t"
 310         self.ptr_native_ty = "long"
 311         self.result_c_ty = "jclass"
 312         self.ptr_arr = "jobjectArray"
 313         self.get_native_arr_len_call = ("(*env)->GetArrayLength(env, ", ")")
 314
 315     def release_native_arr_ptr_call(self, ty_info, arr_var, arr_ptr_var):
 316         if ty_info.subty is None or not ty_info.subty.c_ty.endswith("Array"):
 317             return "(*env)->ReleasePrimitiveArrayCritical(env, " + arr_var + ", " + arr_ptr_var + ", 0)"
 318         return None
 319     def create_native_arr_call(self, arr_len, ty_info):
 320         if ty_info.c_ty == "int8_tArray":
 321             return "(*env)->NewByteArray(env, " + arr_len + ")"
 322         elif ty_info.subty.c_ty.endswith("Array"):
 323             clz_var = ty_info.java_fn_ty_arg[1:].replace("[", "arr_of_")
 324             self.c_array_class_caches.add(clz_var)
 325             return "(*env)->NewObjectArray(env, " + arr_len + ", " + clz_var + "_clz, NULL);\n"
 326         else:
 327             return "(*env)->New" + ty_info.java_ty.strip("[]").title() + "Array(env, " + arr_len + ")"
 328     def set_native_arr_contents(self, arr_name, arr_len, ty_info):
 329         if ty_info.c_ty == "int8_tArray":
 330             return ("(*env)->SetByteArrayRegion(env, " + arr_name + ", 0, " + arr_len + ", ", ")")
 331         else:
 332             assert False
 333     def get_native_arr_contents(self, arr_name, dest_name, arr_len, ty_info, copy):
 334         if ty_info.c_ty == "int8_tArray":
 335             if copy:
 336                 return "(*env)->GetByteArrayRegion(env, " + arr_name + ", 0, " + arr_len + ", " + dest_name + ")"
 337             else:
 338                 return "(*env)->GetByteArrayElements (env, " + arr_name + ", NULL)"
 339         elif not ty_info.java_ty[:len(ty_info.java_ty) - 2].endswith("[]"):
 340             return "(*env)->Get" + ty_info.subty.java_ty.title() + "ArrayElements (env, " + arr_name + ", NULL)"
 341         else:
 342             return None
 343     def get_native_arr_elem(self, arr_name, idxc, ty_info):
 344         if self.get_native_arr_contents(arr_name, "", "", ty_info, False) is None:
 345             return "(*env)->GetObjectArrayElement(env, " + arr_name + ", " + idxc + ")"
 346         else:
 347             assert False # Only called if above is None
 348     def get_native_arr_ptr_call(self, ty_info):
 349         if ty_info.subty is not None and ty_info.subty.c_ty.endswith("Array"):
 350             return None
 351         return ("(*env)->GetPrimitiveArrayCritical(env, ", ", NULL)")
 352     def get_native_arr_entry_call(self, ty_info, arr_name, idxc, entry_access):
 353         if ty_info.subty is None or not ty_info.subty.c_ty.endswith("Array"):
 354             return None
 355         return "(*env)->SetObjectArrayElement(env, " + arr_name + ", " + idxc + ", " + entry_access + ")"
 356     def cleanup_native_arr_ref_contents(self, arr_name, dest_name, arr_len, ty_info):
 357         if ty_info.c_ty == "int8_tArray":
 358             return "(*env)->ReleaseByteArrayElements(env, " + arr_name + ", (int8_t*)" + dest_name + ", 0);"
 359         else:
 360             return "(*env)->Release" + ty_info.java_ty.strip("[]").title() + "ArrayElements(env, " + arr_name + ", " + dest_name + ", 0)"
 361
 362     def str_ref_to_c_call(self, var_name, str_len):
 363         return "str_ref_to_java(env, " + var_name + ", " + str_len + ")"
 364
 365     def init_str(self):
 366         res = ""
 367         for ty in self.c_array_class_caches:
 368             res = res + "static jclass " + ty + "_clz = NULL;\n"
 369         res = res + "JNIEXPORT void Java_org_ldk_impl_bindings_init_1class_1cache(JNIEnv * env, jclass clz) {\n"
 370         for ty in self.c_array_class_caches:
 371             res = res + "\t" + ty + "_clz = (*env)->FindClass(env, \"" + ty.replace("arr_of_", "[") + "\");\n"
 372             res = res + "\tCHECK(" + ty + "_clz != NULL);\n"
 373             res = res + "\t" + ty + "_clz = (*env)->NewGlobalRef(env, " + ty + "_clz);\n"
 374         res = res + "}\n"
 375         return res
 376
 377     def native_c_unitary_enum_map(self, struct_name, variants):
 378         out_java_enum = "package org.ldk.enums;\n\n"
 379         out_java = ""
 380         out_c = ""
 381         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_from_java(" + self.c_fn_args_pfx + ") {\n"
 382         out_c = out_c + "\tswitch ((*env)->CallIntMethod(env, clz, ordinal_meth)) {\n"
 383
 384         out_java_enum = out_java_enum + "public enum " + struct_name + " {\n"
 385         ord_v = 0
 386         for var in variants:
 387             out_java_enum = out_java_enum + "\t" + var + ",\n"
 388             out_c = out_c + "\t\tcase %d: return %s;\n" % (ord_v, var)
 389             ord_v = ord_v + 1
 390         out_java_enum = out_java_enum + "\t; static native void init();\n"
 391         out_java_enum = out_java_enum + "\tstatic { init(); }\n"
 392         out_java_enum = out_java_enum + "}"
 393         out_java = out_java + "\tstatic { " + struct_name + ".values(); /* Force enum statics to run */ }\n"
 394         out_c = out_c + "\t}\n"
 395         out_c = out_c + "\tabort();\n"
 396         out_c = out_c + "}\n"
 397
 398         out_c = out_c + "static jclass " + struct_name + "_class = NULL;\n"
 399         for var in variants:
 400             out_c = out_c + "static jfieldID " + struct_name + "_" + var + " = NULL;\n"
 401         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"
 402         out_c = out_c + "\t" + struct_name + "_class = (*env)->NewGlobalRef(env, clz);\n"
 403         out_c = out_c + "\tCHECK(" + struct_name + "_class != NULL);\n"
 404         for var in variants:
 405             out_c = out_c + "\t" + struct_name + "_" + var + " = (*env)->GetStaticFieldID(env, " + struct_name + "_class, \"" + var + "\", \"Lorg/ldk/enums/" + struct_name + ";\");\n"
 406             out_c = out_c + "\tCHECK(" + struct_name + "_" + var + " != NULL);\n"
 407         out_c = out_c + "}\n"
 408         out_c = out_c + "static inline jclass " + struct_name + "_to_java(JNIEnv *env, " + struct_name + " val) {\n"
 409         out_c = out_c + "\tswitch (val) {\n"
 410         ord_v = 0
 411         for var in variants:
 412             out_c = out_c + "\t\tcase " + var + ":\n"
 413             out_c = out_c + "\t\t\treturn (*env)->GetStaticObjectField(env, " + struct_name + "_class, " + struct_name + "_" + var + ");\n"
 414             ord_v = ord_v + 1
 415         out_c = out_c + "\t\tdefault: abort();\n"
 416         out_c = out_c + "\t}\n"
 417         out_c = out_c + "}\n\n"
 418
 419         return (out_c, out_java_enum, out_java)
 420
 421     def c_unitary_enum_to_native_call(self, ty_info):
 422         return (ty_info.rust_obj + "_to_java(env, ", ")")
 423     def native_unitary_enum_to_c_call(self, ty_info):
 424         return (ty_info.rust_obj + "_from_java(env, ", ")")
 425
 426     def c_complex_enum_pfx(self, struct_name, variants, init_meth_jty_strs):
 427         out_c = ""
 428         for var in variants:
 429             out_c = out_c + "static jclass " + struct_name + "_" + var + "_class = NULL;\n"
 430             out_c = out_c + "static jmethodID " + struct_name + "_" + var + "_meth = NULL;\n"
 431         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"
 432         for var_name in variants:
 433             out_c = out_c + "\t" + struct_name + "_" + var_name + "_class =\n"
 434             out_c = out_c + "\t\t(*env)->NewGlobalRef(env, (*env)->FindClass(env, \"Lorg/ldk/impl/bindings$" + struct_name + "$" + var_name + ";\"));\n"
 435             out_c = out_c + "\tCHECK(" + struct_name + "_" + var_name + "_class != NULL);\n"
 436             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"
 437             out_c = out_c + "\tCHECK(" + struct_name + "_" + var_name + "_meth != NULL);\n"
 438         out_c = out_c + "}\n"
 439         return out_c
 440
 441     def c_complex_enum_pass_ty(self, struct_name):
 442         return "jobject"
 443
 444     def c_constr_native_complex_enum(self, struct_name, variant, c_params):
 445         ret = "(*env)->NewObject(env, " + struct_name + "_" + variant + "_class, " + struct_name + "_" + variant + "_meth"
 446         for param in c_params:
 447             ret = ret + ", " + param
 448         return ret + ")"
 449
 450     def native_c_map_trait(self, struct_name, field_vars, field_fns):
 451         out_java_trait = ""
 452         out_java = ""
 453
 454         # First generate most of the Java code, note that we need information about java method argument strings for C
 455         out_java_trait = out_java_trait + self.hu_struct_file_prefix
 456         out_java_trait = out_java_trait + "public class " + struct_name.replace("LDK","") + " extends CommonBase {\n"
 457         out_java_trait = out_java_trait + "\tfinal bindings." + struct_name + " bindings_instance;\n"
 458         out_java_trait = out_java_trait + "\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); bindings_instance = null; }\n"
 459         out_java_trait = out_java_trait + "\tprivate " + struct_name.replace("LDK", "") + "(bindings." + struct_name + " arg"
 460         for var in field_vars:
 461             if isinstance(var, ConvInfo):
 462                 out_java_trait = out_java_trait + ", " + var.java_hu_ty + " " + var.arg_name
 463             else:
 464                 out_java_trait = out_java_trait + ", bindings." + var[0] + " " + var[1]
 465         out_java_trait = out_java_trait + ") {\n"
 466         out_java_trait = out_java_trait + "\t\tsuper(bindings." + struct_name + "_new(arg"
 467         for var in field_vars:
 468             if isinstance(var, ConvInfo):
 469                 if var.from_hu_conv is not None:
 470                     out_java_trait = out_java_trait + ", " + var.from_hu_conv[0]
 471                 else:
 472                     out_java_trait = out_java_trait + ", " + var.arg_name
 473             else:
 474                 out_java_trait = out_java_trait + ", " + var[1]
 475         out_java_trait = out_java_trait + "));\n"
 476         out_java_trait = out_java_trait + "\t\tthis.ptrs_to.add(arg);\n"
 477         for var in field_vars:
 478             if isinstance(var, ConvInfo):
 479                 if var.from_hu_conv is not None and var.from_hu_conv[1] != "":
 480                     out_java_trait = out_java_trait + "\t\t" + var.from_hu_conv[1] + ";\n"
 481             else:
 482                 out_java_trait = out_java_trait + "\t\tthis.ptrs_to.add(" + var[1] + ");\n"
 483         out_java_trait = out_java_trait + "\t\tthis.bindings_instance = arg;\n"
 484         out_java_trait = out_java_trait + "\t}\n"
 485         out_java_trait = out_java_trait + "\t@Override @SuppressWarnings(\"deprecation\")\n"
 486         out_java_trait = out_java_trait + "\tprotected void finalize() throws Throwable {\n"
 487         out_java_trait = out_java_trait + "\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); } super.finalize();\n"
 488         out_java_trait = out_java_trait + "\t}\n\n"
 489
 490         java_trait_constr = "\tprivate static class " + struct_name + "Holder { " + struct_name.replace("LDK", "") + " held; }\n"
 491         java_trait_constr = java_trait_constr + "\tpublic static " + struct_name.replace("LDK", "") + " new_impl(" + struct_name.replace("LDK", "") + "Interface arg"
 492         for var in field_vars:
 493             if isinstance(var, ConvInfo):
 494                 java_trait_constr = java_trait_constr + ", " + var.java_hu_ty + " " + var.arg_name
 495             else:
 496                 # Ideally we'd be able to take any instance of the interface, but our C code can only represent
 497                 # Java-implemented version, so we require users pass a Java implementation here :/
 498                 java_trait_constr = java_trait_constr + ", " + var[0].replace("LDK", "") + "." + var[0].replace("LDK", "") + "Interface " + var[1] + "_impl"
 499         java_trait_constr = java_trait_constr + ") {\n\t\tfinal " + struct_name + "Holder impl_holder = new " + struct_name + "Holder();\n"
 500         java_trait_constr = java_trait_constr + "\t\timpl_holder.held = new " + struct_name.replace("LDK", "") + "(new bindings." + struct_name + "() {\n"
 501         out_java_trait = out_java_trait + "\tpublic static interface " + struct_name.replace("LDK", "") + "Interface {\n"
 502         out_java = out_java + "\tpublic interface " + struct_name + " {\n"
 503         java_meths = []
 504         for fn_line in field_fns:
 505             java_meth_descr = "("
 506             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 507                 out_java = out_java + "\t\t " + fn_line.ret_ty_info.java_ty + " " + fn_line.fn_name + "("
 508                 java_trait_constr = java_trait_constr + "\t\t\t@Override public " + fn_line.ret_ty_info.java_ty + " " + fn_line.fn_name + "("
 509                 out_java_trait = out_java_trait + "\t\t" + fn_line.ret_ty_info.java_hu_ty + " " + fn_line.fn_name + "("
 510
 511                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 512                     if idx >= 1:
 513                         out_java = out_java + ", "
 514                         java_trait_constr = java_trait_constr + ", "
 515                         out_java_trait = out_java_trait + ", "
 516                     out_java = out_java + arg_conv_info.java_ty + " " + arg_conv_info.arg_name
 517                     out_java_trait = out_java_trait + arg_conv_info.java_hu_ty + " " + arg_conv_info.arg_name
 518                     java_trait_constr = java_trait_constr + arg_conv_info.java_ty + " " + arg_conv_info.arg_name
 519                     java_meth_descr = java_meth_descr + arg_conv_info.java_fn_ty_arg
 520                 java_meth_descr = java_meth_descr + ")" + fn_line.ret_ty_info.java_fn_ty_arg
 521                 java_meths.append((fn_line.fn_name, java_meth_descr))
 522
 523                 out_java = out_java + ");\n"
 524                 out_java_trait = out_java_trait + ");\n"
 525                 java_trait_constr = java_trait_constr + ") {\n"
 526
 527                 for arg_info in fn_line.args_ty:
 528                     if arg_info.to_hu_conv is not None:
 529                         java_trait_constr = java_trait_constr + "\t\t\t\t" + arg_info.to_hu_conv.replace("\n", "\n\t\t\t\t") + "\n"
 530
 531                 if fn_line.ret_ty_info.java_ty != "void":
 532                     java_trait_constr = java_trait_constr + "\t\t\t\t" + fn_line.ret_ty_info.java_hu_ty + " ret = arg." + fn_line.fn_name + "("
 533                 else:
 534                     java_trait_constr = java_trait_constr + "\t\t\t\targ." + fn_line.fn_name + "("
 535
 536                 for idx, arg_info in enumerate(fn_line.args_ty):
 537                     if idx != 0:
 538                         java_trait_constr = java_trait_constr + ", "
 539                     if arg_info.to_hu_conv_name is not None:
 540                         java_trait_constr = java_trait_constr + arg_info.to_hu_conv_name
 541                     else:
 542                         java_trait_constr = java_trait_constr + arg_info.arg_name
 543
 544                 java_trait_constr = java_trait_constr + ");\n"
 545                 if fn_line.ret_ty_info.java_ty != "void":
 546                     if fn_line.ret_ty_info.from_hu_conv is not None:
 547                         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"
 548                         if fn_line.ret_ty_info.from_hu_conv[1] != "":
 549                             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"
 550                         #if fn_line.ret_ty_info.rust_obj in result_types:
 551                         # XXX: We need to handle this in conversion logic so that its cross-language!
 552                             # Avoid double-free by breaking the result - we should learn to clone these and then we can be safe instead
 553                         #    java_trait_constr = java_trait_constr + "\t\t\t\tret.ptr = 0;\n"
 554                         java_trait_constr = java_trait_constr + "\t\t\t\treturn result;\n"
 555                     else:
 556                         java_trait_constr = java_trait_constr + "\t\t\t\treturn ret;\n"
 557                 java_trait_constr = java_trait_constr + "\t\t\t}\n"
 558         java_trait_constr = java_trait_constr + "\t\t}"
 559         for var in field_vars:
 560             if isinstance(var, ConvInfo):
 561                 java_trait_constr = java_trait_constr + ", " + var.arg_name
 562             else:
 563                 java_trait_constr = java_trait_constr + ", " + var[1] + ".new_impl(" + var[1] + "_impl).bindings_instance"
 564         out_java_trait = out_java_trait + "\t}\n"
 565         out_java_trait = out_java_trait + java_trait_constr + ");\n\t\treturn impl_holder.held;\n\t}\n"
 566
 567         out_java = out_java + "\t}\n"
 568
 569         out_java = out_java + "\tpublic static native long " + struct_name + "_new(" + struct_name + " impl"
 570         for var in field_vars:
 571             if isinstance(var, ConvInfo):
 572                 out_java = out_java + ", " + var.java_ty + " " + var.arg_name
 573             else:
 574                 out_java = out_java + ", " + var[0] + " " + var[1]
 575         out_java = out_java + ");\n"
 576
 577         # Now that we've written out our java code (and created java_meths), generate C
 578         out_c = "typedef struct " + struct_name + "_JCalls {\n"
 579         out_c = out_c + "\tatomic_size_t refcnt;\n"
 580         out_c = out_c + "\tJavaVM *vm;\n"
 581         out_c = out_c + "\tjweak o;\n"
 582         for var in field_vars:
 583             if isinstance(var, ConvInfo):
 584                 # We're a regular ol' field
 585                 pass
 586             else:
 587                 # We're a supertrait
 588                 out_c = out_c + "\t" + var[0] + "_JCalls* " + var[1] + ";\n"
 589         for fn in field_fns:
 590             if fn.fn_name != "free" and fn.fn_name != "clone":
 591                 out_c = out_c + "\tjmethodID " + fn.fn_name + "_meth;\n"
 592         out_c = out_c + "} " + struct_name + "_JCalls;\n"
 593
 594         for fn_line in field_fns:
 595             if fn_line.fn_name == "free":
 596                 out_c = out_c + "static void " + struct_name + "_JCalls_free(void* this_arg) {\n"
 597                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 598                 out_c = out_c + "\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n"
 599                 out_c = out_c + "\t\tJNIEnv *env;\n"
 600                 out_c = out_c + "\t\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_8) == JNI_OK);\n"
 601                 out_c = out_c + "\t\t(*env)->DeleteWeakGlobalRef(env, j_calls->o);\n"
 602                 out_c = out_c + "\t\tFREE(j_calls);\n"
 603                 out_c = out_c + "\t}\n}\n"
 604
 605         for idx, fn_line in enumerate(field_fns):
 606             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 607                 assert fn_line.ret_ty_info.ty_info.get_full_rust_ty()[1] == ""
 608                 out_c = out_c + fn_line.ret_ty_info.ty_info.get_full_rust_ty()[0] + " " + fn_line.fn_name + "_jcall("
 609                 if fn_line.self_is_const:
 610                     out_c = out_c + "const void* this_arg"
 611                 else:
 612                     out_c = out_c + "void* this_arg"
 613
 614                 for idx, arg in enumerate(fn_line.args_ty):
 615                     out_c = out_c + ", " + arg.ty_info.get_full_rust_ty()[0] + " " + arg.arg_name + arg.ty_info.get_full_rust_ty()[1]
 616
 617                 out_c = out_c + ") {\n"
 618                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 619                 out_c = out_c + "\tJNIEnv *env;\n"
 620                 out_c = out_c + "\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_8) == JNI_OK);\n"
 621
 622                 for arg_info in fn_line.args_ty:
 623                     if arg_info.ret_conv is not None:
 624                         out_c = out_c + "\t" + arg_info.ret_conv[0].replace('\n', '\n\t')
 625                         out_c = out_c + arg_info.arg_name
 626                         out_c = out_c + arg_info.ret_conv[1].replace('\n', '\n\t') + "\n"
 627
 628                 out_c = out_c + "\tjobject obj = (*env)->NewLocalRef(env, j_calls->o);\n\tCHECK(obj != NULL);\n"
 629                 if fn_line.ret_ty_info.c_ty.endswith("Array"):
 630                     out_c = out_c + "\t" + fn_line.ret_ty_info.c_ty + " arg = (*env)->CallObjectMethod(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 631                 elif not fn_line.ret_ty_info.passed_as_ptr:
 632                     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"
 633                 else:
 634                     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"
 635
 636                 for idx, arg_info in enumerate(fn_line.args_ty):
 637                     if arg_info.ret_conv is not None:
 638                         out_c = out_c + ", " + arg_info.ret_conv_name
 639                     else:
 640                         out_c = out_c + ", " + arg_info.arg_name
 641                 out_c = out_c + ");\n"
 642                 if fn_line.ret_ty_info.arg_conv is not None:
 643                     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"
 644
 645                 out_c = out_c + "}\n"
 646
 647         # Write out a clone function whether we need one or not, as we use them in moving to rust
 648         out_c = out_c + "static void* " + struct_name + "_JCalls_clone(const void* this_arg) {\n"
 649         out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 650         out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n"
 651         for var in field_vars:
 652             if not isinstance(var, ConvInfo):
 653                 out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->" + var[1] + "->refcnt, 1, memory_order_release);\n"
 654         out_c = out_c + "\treturn (void*) this_arg;\n"
 655         out_c = out_c + "}\n"
 656
 657         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_init (" + self.c_fn_args_pfx + ", jobject o"
 658         for var in field_vars:
 659             if isinstance(var, ConvInfo):
 660                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 661             else:
 662                 out_c = out_c + ", jobject " + var[1]
 663         out_c = out_c + ") {\n"
 664
 665         out_c = out_c + "\tjclass c = (*env)->GetObjectClass(env, o);\n"
 666         out_c = out_c + "\tCHECK(c != NULL);\n"
 667         out_c = out_c + "\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n"
 668         out_c = out_c + "\tatomic_init(&calls->refcnt, 1);\n"
 669         out_c = out_c + "\tDO_ASSERT((*env)->GetJavaVM(env, &calls->vm) == 0);\n"
 670         out_c = out_c + "\tcalls->o = (*env)->NewWeakGlobalRef(env, o);\n"
 671
 672         for (fn_name, java_meth_descr) in java_meths:
 673             if fn_name != "free" and fn_name != "clone":
 674                 out_c = out_c + "\tcalls->" + fn_name + "_meth = (*env)->GetMethodID(env, c, \"" + fn_name + "\", \"" + java_meth_descr + "\");\n"
 675                 out_c = out_c + "\tCHECK(calls->" + fn_name + "_meth != NULL);\n"
 676
 677         for var in field_vars:
 678             if isinstance(var, ConvInfo) and var.arg_conv is not None:
 679                 out_c = out_c + "\n\t" + var.arg_conv.replace("\n", "\n\t") +"\n"
 680         out_c = out_c + "\n\t" + struct_name + " ret = {\n"
 681         out_c = out_c + "\t\t.this_arg = (void*) calls,\n"
 682         for fn_line in field_fns:
 683             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 684                 out_c = out_c + "\t\t." + fn_line.fn_name + " = " + fn_line.fn_name + "_jcall,\n"
 685             elif fn_line.fn_name == "free":
 686                 out_c = out_c + "\t\t.free = " + struct_name + "_JCalls_free,\n"
 687             else:
 688                 out_c = out_c + "\t\t.clone = " + struct_name + "_JCalls_clone,\n"
 689         for var in field_vars:
 690             if isinstance(var, ConvInfo):
 691                 if var.arg_conv_name is not None:
 692                     out_c = out_c + "\t\t." + var.arg_name + " = " + var.arg_conv_name + ",\n"
 693                     out_c = out_c + "\t\t.set_" + var.arg_name + " = NULL,\n"
 694                 else:
 695                     out_c = out_c + "\t\t." + var.var_name + " = " + var.var_name + ",\n"
 696                     out_c = out_c + "\t\t.set_" + var.var_name + " = NULL,\n"
 697             else:
 698                 out_c = out_c + "\t\t." + var[1] + " = " + var[0] + "_init(env, clz, " + var[1] + "),\n"
 699         out_c = out_c + "\t};\n"
 700         for var in field_vars:
 701             if not isinstance(var, ConvInfo):
 702                 out_c = out_c + "\tcalls->" + var[1] + " = ret." + var[1] + ".this_arg;\n"
 703         out_c = out_c + "\treturn ret;\n"
 704         out_c = out_c + "}\n"
 705
 706         out_c = out_c + self.c_fn_ty_pfx + "long " + self.c_fn_name_pfx + struct_name.replace("_", "_1") + "_1new (" + self.c_fn_args_pfx + ", jobject o"
 707         for var in field_vars:
 708             if isinstance(var, ConvInfo):
 709                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 710             else:
 711                 out_c = out_c + ", jobject " + var[1]
 712         out_c = out_c + ") {\n"
 713         out_c = out_c + "\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n"
 714         out_c = out_c + "\t*res_ptr = " + struct_name + "_init(env, clz, o"
 715         for var in field_vars:
 716             if isinstance(var, ConvInfo):
 717                 out_c = out_c + ", " + var.arg_name
 718             else:
 719                 out_c = out_c + ", " + var[1]
 720         out_c = out_c + ");\n"
 721         out_c = out_c + "\treturn (long)res_ptr;\n"
 722         out_c = out_c + "}\n"
 723
 724         return (out_java, out_java_trait, out_c)
 725
 726     def trait_struct_inc_refcnt(self, ty_info):
 727         base_conv = "\nif (" + ty_info.var_name + "_conv.free == " + ty_info.rust_obj + "_JCalls_free) {\n"
 728         base_conv = base_conv + "\t// If this_arg is a JCalls struct, then we need to increment the refcnt in it.\n"
 729         base_conv = base_conv + "\t" + ty_info.rust_obj + "_JCalls_clone(" + ty_info.var_name + "_conv.this_arg);\n}"
 730         return base_conv
 731
 732     def map_complex_enum(self, struct_name, variant_list, camel_to_snake):
 733         java_hu_type = struct_name.replace("LDK", "")
 734         out_java_enum = ""
 735         out_java = ""
 736         out_c = ""
 737
 738         out_java_enum += (self.hu_struct_file_prefix)
 739         out_java_enum += ("public class " + java_hu_type + " extends CommonBase {\n")
 740         out_java_enum += ("\tprivate " + java_hu_type + "(Object _dummy, long ptr) { super(ptr); }\n")
 741         out_java_enum += ("\t@Override @SuppressWarnings(\"deprecation\")\n")
 742         out_java_enum += ("\tprotected void finalize() throws Throwable {\n")
 743         out_java_enum += ("\t\tsuper.finalize();\n")
 744         out_java_enum += ("\t\tif (ptr != 0) { bindings." + java_hu_type + "_free(ptr); }\n")
 745         out_java_enum += ("\t}\n")
 746         out_java_enum += ("\tstatic " + java_hu_type + " constr_from_ptr(long ptr) {\n")
 747         out_java_enum += ("\t\tbindings." + struct_name + " raw_val = bindings." + struct_name + "_ref_from_ptr(ptr);\n")
 748         java_hu_subclasses = ""
 749
 750         init_meth_jty_strs = {}
 751
 752         out_java +=  ("\tpublic static class " + struct_name + " {\n")
 753         out_java +=  ("\t\tprivate " + struct_name + "() {}\n")
 754         for var in variant_list:
 755             out_java +=  ("\t\tpublic final static class " + var.var_name + " extends " + struct_name + " {\n")
 756             java_hu_subclasses = java_hu_subclasses + "\tpublic final static class " + var.var_name + " extends " + java_hu_type + " {\n"
 757             out_java_enum += ("\t\tif (raw_val.getClass() == bindings." + struct_name + "." + var.var_name + ".class) {\n")
 758             out_java_enum += ("\t\t\treturn new " + var.var_name + "(ptr, (bindings." + struct_name + "." + var.var_name + ")raw_val);\n")
 759             init_meth_jty_str = ""
 760             init_meth_params = ""
 761             init_meth_body = ""
 762             hu_conv_body = ""
 763             for idx, field_ty in enumerate(var.fields):
 764                 out_java += ("\t\t\tpublic " + field_ty.java_ty + " " + field_ty.arg_name + ";\n")
 765                 java_hu_subclasses = java_hu_subclasses + "\t\tpublic final " + field_ty.java_hu_ty + " " + field_ty.arg_name + ";\n"
 766                 if field_ty.to_hu_conv is not None:
 767                     hu_conv_body = hu_conv_body + "\t\t\t" + field_ty.java_ty + " " + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
 768                     hu_conv_body = hu_conv_body + "\t\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
 769                     hu_conv_body = hu_conv_body + "\t\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
 770                 else:
 771                     hu_conv_body = hu_conv_body + "\t\t\tthis." + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
 772                 init_meth_jty_str = init_meth_jty_str + field_ty.java_fn_ty_arg
 773                 if idx > 0:
 774                     init_meth_params = init_meth_params + ", "
 775                 init_meth_params = init_meth_params + field_ty.java_ty + " " + field_ty.arg_name
 776                 init_meth_body = init_meth_body + "this." + field_ty.arg_name + " = " + field_ty.arg_name + "; "
 777             out_java +=  ("\t\t\t" + var.var_name + "(" + init_meth_params + ") { ")
 778             out_java +=  (init_meth_body)
 779             out_java +=  ("}\n")
 780             out_java += ("\t\t}\n")
 781             out_java_enum += ("\t\t}\n")
 782             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"
 783             java_hu_subclasses = java_hu_subclasses + hu_conv_body
 784             java_hu_subclasses = java_hu_subclasses + "\t\t}\n\t}\n"
 785             init_meth_jty_strs[var.var_name] = init_meth_jty_str
 786         out_java += ("\t\tstatic native void init();\n")
 787         out_java += ("\t}\n")
 788         out_java_enum += ("\t\tassert false; return null; // Unreachable without extending the (internal) bindings interface\n\t}\n\n")
 789         out_java_enum += (java_hu_subclasses)
 790         out_java += ("\tstatic { " + struct_name + ".init(); }\n")
 791         out_java += ("\tpublic static native " + struct_name + " " + struct_name + "_ref_from_ptr(long ptr);\n");
 792
 793         out_c += (self.c_complex_enum_pfx(struct_name, [x.var_name for x in variant_list], init_meth_jty_strs))
 794
 795         out_c += (self.c_fn_ty_pfx + self.c_complex_enum_pass_ty(struct_name) + " " + self.c_fn_name_pfx + struct_name.replace("_", "_1") + "_1ref_1from_1ptr (" + self.c_fn_args_pfx + ", " + self.ptr_c_ty + " ptr) {\n")
 796         out_c += ("\t" + struct_name + " *obj = (" + struct_name + "*)ptr;\n")
 797         out_c += ("\tswitch(obj->tag) {\n")
 798         for var in variant_list:
 799             out_c += ("\t\tcase " + struct_name + "_" + var.var_name + ": {\n")
 800             c_params = []
 801             for idx, field_map in enumerate(var.fields):
 802                 if field_map.ret_conv is not None:
 803                     out_c += ("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
 804                     out_c += ("obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name)
 805                     out_c += (field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
 806                     c_params.append(field_map.ret_conv_name)
 807                 else:
 808                     c_params.append("obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name)
 809             out_c += ("\t\t\treturn " + self.c_constr_native_complex_enum(struct_name, var.var_name, c_params) + ";\n")
 810             out_c += ("\t\t}\n")
 811         out_c += ("\t\tdefault: abort();\n")
 812         out_c += ("\t}\n}\n")
 813         out_java_enum += ("}\n")
 814         return (out_java, out_java_enum, out_c)
 815
 816     def map_opaque_struct(self, struct_name):
 817         out_opaque_struct_human = ""
 818         out_opaque_struct_human += self.hu_struct_file_prefix
 819         out_opaque_struct_human += ("public class " + struct_name.replace("LDK","") + " extends CommonBase")
 820         if struct_name.startswith("LDKLocked"):
 821             out_opaque_struct_human += (" implements AutoCloseable")
 822         out_opaque_struct_human += (" {\n")
 823         out_opaque_struct_human += ("\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); }\n")
 824         if struct_name.startswith("LDKLocked"):
 825             out_opaque_struct_human += ("\t@Override public void close() {\n")
 826         else:
 827             out_opaque_struct_human += ("\t@Override @SuppressWarnings(\"deprecation\")\n")
 828             out_opaque_struct_human += ("\tprotected void finalize() throws Throwable {\n")
 829             out_opaque_struct_human += ("\t\tsuper.finalize();\n")
 830         out_opaque_struct_human += ("\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); }\n")
 831         out_opaque_struct_human += ("\t}\n\n")
 832         return out_opaque_struct_human
 833
 834
 835     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):
 836         out_java = ""
 837         out_c = ""
 838         out_java_struct = None
 839
 840         out_java += ("\tpublic static native ")
 841         out_c += (self.c_fn_ty_pfx)
 842         out_c += (return_type_info.c_ty)
 843         out_java += (return_type_info.java_ty)
 844         if return_type_info.ret_conv is not None:
 845             ret_conv_pfx, ret_conv_sfx = return_type_info.ret_conv
 846         out_java += (" " + method_name + "(")
 847         out_c += (" " + self.c_fn_name_pfx + method_name.replace('_', '_1') + "(" + self.c_fn_args_pfx)
 848
 849         for idx, arg_conv_info in enumerate(argument_types):
 850             if idx != 0:
 851                 out_java += (", ")
 852             if arg_conv_info.c_ty != "void":
 853                 out_c += (", ")
 854             if arg_conv_info.c_ty != "void":
 855                 out_c += (arg_conv_info.c_ty + " " + arg_conv_info.arg_name)
 856                 out_java += (arg_conv_info.java_ty + " " + arg_conv_info.arg_name)
 857
 858         if has_out_java_struct:
 859             out_java_struct = ""
 860             if not args_known:
 861                 out_java_struct += ("\t// Skipped " + method_name + "\n")
 862                 has_out_java_struct = False
 863             else:
 864                 meth_n = method_name[len(struct_meth) + 1:]
 865                 if not takes_self:
 866                     out_java_struct += (
 867                         "\tpublic static " + return_type_info.java_hu_ty + " constructor_" + meth_n + "(")
 868                 else:
 869                     out_java_struct += ("\tpublic " + return_type_info.java_hu_ty + " " + meth_n + "(")
 870                 for idx, arg in enumerate(argument_types):
 871                     if idx != 0:
 872                         if not takes_self or idx > 1:
 873                             out_java_struct += (", ")
 874                     elif takes_self:
 875                         continue
 876                     if arg.java_ty != "void":
 877                         if arg.arg_name in default_constructor_args:
 878                             for explode_idx, explode_arg in enumerate(default_constructor_args[arg.arg_name]):
 879                                 if explode_idx != 0:
 880                                     out_java_struct += (", ")
 881                                 out_java_struct += (
 882                                     explode_arg.java_hu_ty + " " + arg.arg_name + "_" + explode_arg.arg_name)
 883                         else:
 884                             out_java_struct += (arg.java_hu_ty + " " + arg.arg_name)
 885         out_java += (");\n")
 886         out_c += (") {\n")
 887         if out_java_struct is not None:
 888             out_java_struct += (") {\n")
 889         for info in argument_types:
 890             if info.arg_conv is not None:
 891                 out_c += ("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
 892         if return_type_info.ret_conv is not None:
 893             out_c += ("\t" + ret_conv_pfx.replace('\n', '\n\t'))
 894         elif return_type_info.c_ty != "void":
 895             out_c += ("\t" + return_type_info.c_ty + " ret_val = ")
 896         else:
 897             out_c += ("\t")
 898         if c_call_string is None:
 899             out_c += (method_name + "(")
 900         else:
 901             out_c += (c_call_string)
 902         for idx, info in enumerate(argument_types):
 903             if info.arg_conv_name is not None:
 904                 if idx != 0:
 905                     out_c += (", ")
 906                 elif c_call_string is not None:
 907                     continue
 908                 out_c += (info.arg_conv_name)
 909         out_c += (")")
 910         if return_type_info.ret_conv is not None:
 911             out_c += (ret_conv_sfx.replace('\n', '\n\t'))
 912         else:
 913             out_c += (";")
 914         for info in argument_types:
 915             if info.arg_conv_cleanup is not None:
 916                 out_c += ("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
 917         if return_type_info.ret_conv is not None:
 918             out_c += ("\n\treturn " + return_type_info.ret_conv_name + ";")
 919         elif return_type_info.c_ty != "void":
 920             out_c += ("\n\treturn ret_val;")
 921         out_c += ("\n}\n\n")
 922
 923         if has_out_java_struct:
 924             out_java_struct += ("\t\t")
 925             if return_type_info.java_ty != "void":
 926                 out_java_struct += (return_type_info.java_ty + " ret = ")
 927             out_java_struct += ("bindings." + method_name + "(")
 928             for idx, info in enumerate(argument_types):
 929                 if idx != 0:
 930                     out_java_struct += (", ")
 931                 if idx == 0 and takes_self:
 932                     out_java_struct += ("this.ptr")
 933                 elif info.arg_name in default_constructor_args:
 934                     out_java_struct += ("bindings." + info.java_hu_ty + "_new(")
 935                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
 936                         if explode_idx != 0:
 937                             out_java_struct += (", ")
 938                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
 939                         if explode_arg.from_hu_conv is not None:
 940                             out_java_struct += (
 941                                 explode_arg.from_hu_conv[0].replace(explode_arg.arg_name, expl_arg_name))
 942                         else:
 943                             out_java_struct += (expl_arg_name)
 944                     out_java_struct += (")")
 945                 elif info.from_hu_conv is not None:
 946                     out_java_struct += (info.from_hu_conv[0])
 947                 else:
 948                     out_java_struct += (info.arg_name)
 949             out_java_struct += (");\n")
 950             if return_type_info.to_hu_conv is not None:
 951                 if not takes_self:
 952                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t").replace("this",
 953                                                                                                                return_type_info.to_hu_conv_name) + "\n")
 954                 else:
 955                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t") + "\n")
 956
 957             for idx, info in enumerate(argument_types):
 958                 if idx == 0 and takes_self:
 959                     pass
 960                 elif info.arg_name in default_constructor_args:
 961                     for explode_arg in default_constructor_args[info.arg_name]:
 962                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
 963                         if explode_arg.from_hu_conv is not None and return_type_info.to_hu_conv_name:
 964                             out_java_struct += ("\t\t" + explode_arg.from_hu_conv[1].replace(explode_arg.arg_name,
 965                                                                                                expl_arg_name).replace(
 966                                 "this", return_type_info.to_hu_conv_name) + ";\n")
 967                 elif info.from_hu_conv is not None and info.from_hu_conv[1] != "":
 968                     if not takes_self and return_type_info.to_hu_conv_name is not None:
 969                         out_java_struct += (
 970                             "\t\t" + info.from_hu_conv[1].replace("this", return_type_info.to_hu_conv_name) + ";\n")
 971                     else:
 972                         out_java_struct += ("\t\t" + info.from_hu_conv[1] + ";\n")
 973
 974             if return_type_info.to_hu_conv_name is not None:
 975                 out_java_struct += ("\t\treturn " + return_type_info.to_hu_conv_name + ";\n")
 976             elif return_type_info.java_ty != "void" and return_type_info.rust_obj != "LDK" + struct_meth:
 977                 out_java_struct += ("\t\treturn ret;\n")
 978             out_java_struct += ("\t}\n\n")
 979
 980         return (out_java, out_c, out_java_struct)