_ 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.util_fn_pfx = """package org.ldk.structs;
  55 import org.ldk.impl.bindings;
  56 import java.util.Arrays;
  57
  58 public class UtilMethods {
  59 """
  60         self.util_fn_sfx = "}"
  61         self.common_base = """package org.ldk.structs;
  62 import java.util.LinkedList;
  63 class CommonBase {
  64         final long ptr;
  65         LinkedList<Object> ptrs_to = new LinkedList();
  66         protected CommonBase(long ptr) { this.ptr = ptr; }
  67         public long _test_only_get_ptr() { return this.ptr; }
  68 }
  69 """
  70
  71         self.c_file_pfx = """#include \"org_ldk_impl_bindings.h\"
  72 #include <rust_types.h>
  73 #include <lightning.h>
  74 #include <string.h>
  75 #include <stdatomic.h>
  76 #include <stdlib.h>
  77
  78 """
  79
  80         if not DEBUG:
  81             self.c_file_pfx = self.c_file_pfx + """#define MALLOC(a, _) malloc(a)
  82 #define FREE(p) if ((long)(p) > 1024) { free(p); }
  83 #define DO_ASSERT(a) (void)(a)
  84 #define CHECK(a)
  85 """
  86         else:
  87             self.c_file_pfx = self.c_file_pfx + """#include <assert.h>
  88 // Always run a, then assert it is true:
  89 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
  90 // Assert a is true or do nothing
  91 #define CHECK(a) DO_ASSERT(a)
  92
  93 // Running a leak check across all the allocations and frees of the JDK is a mess,
  94 // so instead we implement our own naive leak checker here, relying on the -wrap
  95 // linker option to wrap malloc/calloc/realloc/free, tracking everyhing allocated
  96 // and free'd in Rust or C across the generated bindings shared library.
  97 #include <threads.h>
  98 #include <execinfo.h>
  99 #include <unistd.h>
 100 static mtx_t allocation_mtx;
 101
 102 void __attribute__((constructor)) init_mtx() {
 103         DO_ASSERT(mtx_init(&allocation_mtx, mtx_plain) == thrd_success);
 104 }
 105
 106 #define BT_MAX 128
 107 typedef struct allocation {
 108         struct allocation* next;
 109         void* ptr;
 110         const char* struct_name;
 111         void* bt[BT_MAX];
 112         int bt_len;
 113 } allocation;
 114 static allocation* allocation_ll = NULL;
 115
 116 void* __real_malloc(size_t len);
 117 void* __real_calloc(size_t nmemb, size_t len);
 118 static void new_allocation(void* res, const char* struct_name) {
 119         allocation* new_alloc = __real_malloc(sizeof(allocation));
 120         new_alloc->ptr = res;
 121         new_alloc->struct_name = struct_name;
 122         new_alloc->bt_len = backtrace(new_alloc->bt, BT_MAX);
 123         DO_ASSERT(mtx_lock(&allocation_mtx) == thrd_success);
 124         new_alloc->next = allocation_ll;
 125         allocation_ll = new_alloc;
 126         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
 127 }
 128 static void* MALLOC(size_t len, const char* struct_name) {
 129         void* res = __real_malloc(len);
 130         new_allocation(res, struct_name);
 131         return res;
 132 }
 133 void __real_free(void* ptr);
 134 static void alloc_freed(void* ptr) {
 135         allocation* p = NULL;
 136         DO_ASSERT(mtx_lock(&allocation_mtx) == thrd_success);
 137         allocation* it = allocation_ll;
 138         while (it->ptr != ptr) {
 139                 p = it; it = it->next;
 140                 if (it == NULL) {
 141                         fprintf(stderr, "Tried to free unknown pointer %p at:\\n", ptr);
 142                         void* bt[BT_MAX];
 143                         int bt_len = backtrace(bt, BT_MAX);
 144                         backtrace_symbols_fd(bt, bt_len, STDERR_FILENO);
 145                         fprintf(stderr, "\\n\\n");
 146                         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
 147                         return; // addrsan should catch malloc-unknown and print more info than we have
 148                 }
 149         }
 150         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
 151         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
 152         DO_ASSERT(it->ptr == ptr);
 153         __real_free(it);
 154 }
 155 static void FREE(void* ptr) {
 156         if ((long)ptr < 1024) return; // Rust loves to create pointers to the NULL page for dummys
 157         alloc_freed(ptr);
 158         __real_free(ptr);
 159 }
 160
 161 void* __wrap_malloc(size_t len) {
 162         void* res = __real_malloc(len);
 163         new_allocation(res, "malloc call");
 164         return res;
 165 }
 166 void* __wrap_calloc(size_t nmemb, size_t len) {
 167         void* res = __real_calloc(nmemb, len);
 168         new_allocation(res, "calloc call");
 169         return res;
 170 }
 171 void __wrap_free(void* ptr) {
 172         if (ptr == NULL) return;
 173         alloc_freed(ptr);
 174         __real_free(ptr);
 175 }
 176
 177 void* __real_realloc(void* ptr, size_t newlen);
 178 void* __wrap_realloc(void* ptr, size_t len) {
 179         if (ptr != NULL) alloc_freed(ptr);
 180         void* res = __real_realloc(ptr, len);
 181         new_allocation(res, "realloc call");
 182         return res;
 183 }
 184 void __wrap_reallocarray(void* ptr, size_t new_sz) {
 185         // Rust doesn't seem to use reallocarray currently
 186         DO_ASSERT(false);
 187 }
 188
 189 void __attribute__((destructor)) check_leaks() {
 190         size_t alloc_count = 0;
 191         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 192                 fprintf(stderr, "%s %p remains:\\n", a->struct_name, a->ptr);
 193                 backtrace_symbols_fd(a->bt, a->bt_len, STDERR_FILENO);
 194                 fprintf(stderr, "\\n\\n");
 195                 alloc_count++;
 196         }
 197         fprintf(stderr, "%lu allocations remained.\\n", alloc_count);
 198         DO_ASSERT(allocation_ll == NULL);
 199 }
 200 """
 201         self.c_file_pfx = self.c_file_pfx + """
 202 static jmethodID ordinal_meth = NULL;
 203 static jmethodID slicedef_meth = NULL;
 204 static jclass slicedef_cls = NULL;
 205 JNIEXPORT void Java_org_ldk_impl_bindings_init(JNIEnv * env, jclass _b, jclass enum_class, jclass slicedef_class) {
 206         ordinal_meth = (*env)->GetMethodID(env, enum_class, "ordinal", "()I");
 207         CHECK(ordinal_meth != NULL);
 208         slicedef_meth = (*env)->GetMethodID(env, slicedef_class, "<init>", "(JJJ)V");
 209         CHECK(slicedef_meth != NULL);
 210         slicedef_cls = (*env)->NewGlobalRef(env, slicedef_class);
 211         CHECK(slicedef_cls != NULL);
 212 }
 213
 214 JNIEXPORT jboolean JNICALL Java_org_ldk_impl_bindings_deref_1bool (JNIEnv * env, jclass _a, jlong ptr) {
 215         return *((bool*)ptr);
 216 }
 217 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_deref_1long (JNIEnv * env, jclass _a, jlong ptr) {
 218         return *((long*)ptr);
 219 }
 220 JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_free_1heap_1ptr (JNIEnv * env, jclass _a, jlong ptr) {
 221         FREE((void*)ptr);
 222 }
 223 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_read_1bytes (JNIEnv * env, jclass _b, jlong ptr, jlong len) {
 224         jbyteArray ret_arr = (*env)->NewByteArray(env, len);
 225         (*env)->SetByteArrayRegion(env, ret_arr, 0, len, (unsigned char*)ptr);
 226         return ret_arr;
 227 }
 228 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_get_1u8_1slice_1bytes (JNIEnv * env, jclass _b, jlong slice_ptr) {
 229         LDKu8slice *slice = (LDKu8slice*)slice_ptr;
 230         jbyteArray ret_arr = (*env)->NewByteArray(env, slice->datalen);
 231         (*env)->SetByteArrayRegion(env, ret_arr, 0, slice->datalen, slice->data);
 232         return ret_arr;
 233 }
 234 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_bytes_1to_1u8_1vec (JNIEnv * env, jclass _b, jbyteArray bytes) {
 235         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "LDKCVec_u8");
 236         vec->datalen = (*env)->GetArrayLength(env, bytes);
 237         vec->data = (uint8_t*)MALLOC(vec->datalen, "LDKCVec_u8Z Bytes");
 238         (*env)->GetByteArrayRegion (env, bytes, 0, vec->datalen, vec->data);
 239         return (long)vec;
 240 }
 241 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_txpointer_1get_1buffer (JNIEnv * env, jclass _b, jlong ptr) {
 242         LDKTransaction *txdata = (LDKTransaction*)ptr;
 243         LDKu8slice slice;
 244         slice.data = txdata->data;
 245         slice.datalen = txdata->datalen;
 246         return Java_org_ldk_impl_bindings_get_1u8_1slice_1bytes(env, _b, (long)&slice);
 247 }
 248 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_new_1txpointer_1copy_1data (JNIEnv * env, jclass _b, jbyteArray bytes) {
 249         LDKTransaction *txdata = (LDKTransaction*)MALLOC(sizeof(LDKTransaction), "LDKTransaction");
 250         txdata->datalen = (*env)->GetArrayLength(env, bytes);
 251         txdata->data = (uint8_t*)MALLOC(txdata->datalen, "Tx Data Bytes");
 252         txdata->data_is_owned = false;
 253         (*env)->GetByteArrayRegion (env, bytes, 0, txdata->datalen, txdata->data);
 254         return (long)txdata;
 255 }
 256 JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_txpointer_1free (JNIEnv * env, jclass _b, jlong ptr) {
 257         LDKTransaction *tx = (LDKTransaction*)ptr;
 258         tx->data_is_owned = true;
 259         Transaction_free(*tx);
 260         FREE((void*)ptr);
 261 }
 262 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_vec_1slice_1len (JNIEnv * env, jclass _a, jlong ptr) {
 263         // Check offsets of a few Vec types are all consistent as we're meant to be generic across types
 264         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_SignatureZ, datalen), "Vec<*> needs to be mapped identically");
 265         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_MessageSendEventZ, datalen), "Vec<*> needs to be mapped identically");
 266         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_EventZ, datalen), "Vec<*> needs to be mapped identically");
 267         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_C2Tuple_usizeTransactionZZ, datalen), "Vec<*> needs to be mapped identically");
 268         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)ptr;
 269         return (long)vec->datalen;
 270 }
 271 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_new_1empty_1slice_1vec (JNIEnv * env, jclass _b) {
 272         // Check sizes of a few Vec types are all consistent as we're meant to be generic across types
 273         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_SignatureZ), "Vec<*> needs to be mapped identically");
 274         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_MessageSendEventZ), "Vec<*> needs to be mapped identically");
 275         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_EventZ), "Vec<*> needs to be mapped identically");
 276         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_C2Tuple_usizeTransactionZZ), "Vec<*> needs to be mapped identically");
 277         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "Empty LDKCVec");
 278         vec->data = NULL;
 279         vec->datalen = 0;
 280         return (long)vec;
 281 }
 282
 283 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
 284 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
 285 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
 286 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
 287
 288 _Static_assert(sizeof(jlong) == sizeof(int64_t), "We assume that j-types are the same as C types");
 289 _Static_assert(sizeof(jbyte) == sizeof(char), "We assume that j-types are the same as C types");
 290 _Static_assert(sizeof(void*) <= 8, "Pointers must fit into 64 bits");
 291
 292 typedef jlongArray int64_tArray;
 293 typedef jbyteArray int8_tArray;
 294
 295 static inline jstring str_ref_to_java(JNIEnv *env, const char* chars, size_t len) {
 296         // Sadly we need to create a temporary because Java can't accept a char* without a 0-terminator
 297         char* err_buf = MALLOC(len + 1, "str conv buf");
 298         memcpy(err_buf, chars, len);
 299         err_buf[len] = 0;
 300         jstring err_conv = (*env)->NewStringUTF(env, chars);
 301         FREE(err_buf);
 302         return err_conv;
 303 }
 304 """
 305
 306         self.hu_struct_file_prefix = """package org.ldk.structs;
 307
 308 import org.ldk.impl.bindings;
 309 import org.ldk.enums.*;
 310 import org.ldk.util.*;
 311 import java.util.Arrays;
 312
 313 @SuppressWarnings("unchecked") // We correctly assign various generic arrays
 314 """
 315         self.c_fn_ty_pfx = "JNIEXPORT "
 316         self.c_fn_args_pfx = "JNIEnv *env, jclass clz"
 317         self.file_ext = ".java"
 318         self.ptr_c_ty = "int64_t"
 319         self.ptr_native_ty = "long"
 320         self.result_c_ty = "jclass"
 321         self.ptr_arr = "jobjectArray"
 322         self.get_native_arr_len_call = ("(*env)->GetArrayLength(env, ", ")")
 323
 324     def release_native_arr_ptr_call(self, ty_info, arr_var, arr_ptr_var):
 325         if ty_info.subty is None or not ty_info.subty.c_ty.endswith("Array"):
 326             return "(*env)->ReleasePrimitiveArrayCritical(env, " + arr_var + ", " + arr_ptr_var + ", 0)"
 327         return None
 328     def create_native_arr_call(self, arr_len, ty_info):
 329         if ty_info.c_ty == "int8_tArray":
 330             return "(*env)->NewByteArray(env, " + arr_len + ")"
 331         elif ty_info.subty.c_ty.endswith("Array"):
 332             clz_var = ty_info.java_fn_ty_arg[1:].replace("[", "arr_of_")
 333             self.c_array_class_caches.add(clz_var)
 334             return "(*env)->NewObjectArray(env, " + arr_len + ", " + clz_var + "_clz, NULL);\n"
 335         else:
 336             return "(*env)->New" + ty_info.java_ty.strip("[]").title() + "Array(env, " + arr_len + ")"
 337     def set_native_arr_contents(self, arr_name, arr_len, ty_info):
 338         if ty_info.c_ty == "int8_tArray":
 339             return ("(*env)->SetByteArrayRegion(env, " + arr_name + ", 0, " + arr_len + ", ", ")")
 340         else:
 341             assert False
 342     def get_native_arr_contents(self, arr_name, dest_name, arr_len, ty_info, copy):
 343         if ty_info.c_ty == "int8_tArray":
 344             if copy:
 345                 return "(*env)->GetByteArrayRegion(env, " + arr_name + ", 0, " + arr_len + ", " + dest_name + ")"
 346             else:
 347                 return "(*env)->GetByteArrayElements (env, " + arr_name + ", NULL)"
 348         elif not ty_info.java_ty[:len(ty_info.java_ty) - 2].endswith("[]"):
 349             return "(*env)->Get" + ty_info.subty.java_ty.title() + "ArrayElements (env, " + arr_name + ", NULL)"
 350         else:
 351             return None
 352     def get_native_arr_elem(self, arr_name, idxc, ty_info):
 353         if self.get_native_arr_contents(arr_name, "", "", ty_info, False) is None:
 354             return "(*env)->GetObjectArrayElement(env, " + arr_name + ", " + idxc + ")"
 355         else:
 356             assert False # Only called if above is None
 357     def get_native_arr_ptr_call(self, ty_info):
 358         if ty_info.subty is not None and ty_info.subty.c_ty.endswith("Array"):
 359             return None
 360         return ("(*env)->GetPrimitiveArrayCritical(env, ", ", NULL)")
 361     def get_native_arr_entry_call(self, ty_info, arr_name, idxc, entry_access):
 362         if ty_info.subty is None or not ty_info.subty.c_ty.endswith("Array"):
 363             return None
 364         return "(*env)->SetObjectArrayElement(env, " + arr_name + ", " + idxc + ", " + entry_access + ")"
 365     def cleanup_native_arr_ref_contents(self, arr_name, dest_name, arr_len, ty_info):
 366         if ty_info.c_ty == "int8_tArray":
 367             return "(*env)->ReleaseByteArrayElements(env, " + arr_name + ", (int8_t*)" + dest_name + ", 0);"
 368         else:
 369             return "(*env)->Release" + ty_info.java_ty.strip("[]").title() + "ArrayElements(env, " + arr_name + ", " + dest_name + ", 0)"
 370
 371     def str_ref_to_c_call(self, var_name, str_len):
 372         return "str_ref_to_java(env, " + var_name + ", " + str_len + ")"
 373
 374     def c_fn_name_define_pfx(self, fn_name, has_args):
 375         if has_args:
 376             return "JNICALL Java_org_ldk_impl_bindings_" + fn_name.replace("_", "_1") + "(JNIEnv *env, jclass clz, "
 377         return "JNICALL Java_org_ldk_impl_bindings_" + fn_name.replace("_", "_1") + "(JNIEnv *env, jclass clz"
 378
 379     def init_str(self):
 380         res = ""
 381         for ty in self.c_array_class_caches:
 382             res = res + "static jclass " + ty + "_clz = NULL;\n"
 383         res = res + "JNIEXPORT void Java_org_ldk_impl_bindings_init_1class_1cache(JNIEnv * env, jclass clz) {\n"
 384         for ty in self.c_array_class_caches:
 385             res = res + "\t" + ty + "_clz = (*env)->FindClass(env, \"" + ty.replace("arr_of_", "[") + "\");\n"
 386             res = res + "\tCHECK(" + ty + "_clz != NULL);\n"
 387             res = res + "\t" + ty + "_clz = (*env)->NewGlobalRef(env, " + ty + "_clz);\n"
 388         res = res + "}\n"
 389         return res
 390
 391     def native_c_unitary_enum_map(self, struct_name, variants):
 392         out_java_enum = "package org.ldk.enums;\n\n"
 393         out_java = ""
 394         out_c = ""
 395         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_from_java(" + self.c_fn_args_pfx + ") {\n"
 396         out_c = out_c + "\tswitch ((*env)->CallIntMethod(env, clz, ordinal_meth)) {\n"
 397
 398         out_java_enum = out_java_enum + "public enum " + struct_name + " {\n"
 399         ord_v = 0
 400         for var in variants:
 401             out_java_enum = out_java_enum + "\t" + var + ",\n"
 402             out_c = out_c + "\t\tcase %d: return %s;\n" % (ord_v, var)
 403             ord_v = ord_v + 1
 404         out_java_enum = out_java_enum + "\t; static native void init();\n"
 405         out_java_enum = out_java_enum + "\tstatic { init(); }\n"
 406         out_java_enum = out_java_enum + "}"
 407         out_java = out_java + "\tstatic { " + struct_name + ".values(); /* Force enum statics to run */ }\n"
 408         out_c = out_c + "\t}\n"
 409         out_c = out_c + "\tabort();\n"
 410         out_c = out_c + "}\n"
 411
 412         out_c = out_c + "static jclass " + struct_name + "_class = NULL;\n"
 413         for var in variants:
 414             out_c = out_c + "static jfieldID " + struct_name + "_" + var + " = NULL;\n"
 415         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"
 416         out_c = out_c + "\t" + struct_name + "_class = (*env)->NewGlobalRef(env, clz);\n"
 417         out_c = out_c + "\tCHECK(" + struct_name + "_class != NULL);\n"
 418         for var in variants:
 419             out_c = out_c + "\t" + struct_name + "_" + var + " = (*env)->GetStaticFieldID(env, " + struct_name + "_class, \"" + var + "\", \"Lorg/ldk/enums/" + struct_name + ";\");\n"
 420             out_c = out_c + "\tCHECK(" + struct_name + "_" + var + " != NULL);\n"
 421         out_c = out_c + "}\n"
 422         out_c = out_c + "static inline jclass " + struct_name + "_to_java(JNIEnv *env, " + struct_name + " val) {\n"
 423         out_c = out_c + "\tswitch (val) {\n"
 424         ord_v = 0
 425         for var in variants:
 426             out_c = out_c + "\t\tcase " + var + ":\n"
 427             out_c = out_c + "\t\t\treturn (*env)->GetStaticObjectField(env, " + struct_name + "_class, " + struct_name + "_" + var + ");\n"
 428             ord_v = ord_v + 1
 429         out_c = out_c + "\t\tdefault: abort();\n"
 430         out_c = out_c + "\t}\n"
 431         out_c = out_c + "}\n\n"
 432
 433         return (out_c, out_java_enum, out_java)
 434
 435     def c_unitary_enum_to_native_call(self, ty_info):
 436         return (ty_info.rust_obj + "_to_java(env, ", ")")
 437     def native_unitary_enum_to_c_call(self, ty_info):
 438         return (ty_info.rust_obj + "_from_java(env, ", ")")
 439
 440     def c_complex_enum_pfx(self, struct_name, variants, init_meth_jty_strs):
 441         out_c = ""
 442         for var in variants:
 443             out_c = out_c + "static jclass " + struct_name + "_" + var + "_class = NULL;\n"
 444             out_c = out_c + "static jmethodID " + struct_name + "_" + var + "_meth = NULL;\n"
 445         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"
 446         for var_name in variants:
 447             out_c = out_c + "\t" + struct_name + "_" + var_name + "_class =\n"
 448             out_c = out_c + "\t\t(*env)->NewGlobalRef(env, (*env)->FindClass(env, \"Lorg/ldk/impl/bindings$" + struct_name + "$" + var_name + ";\"));\n"
 449             out_c = out_c + "\tCHECK(" + struct_name + "_" + var_name + "_class != NULL);\n"
 450             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"
 451             out_c = out_c + "\tCHECK(" + struct_name + "_" + var_name + "_meth != NULL);\n"
 452         out_c = out_c + "}\n"
 453         return out_c
 454
 455     def c_complex_enum_pass_ty(self, struct_name):
 456         return "jobject"
 457
 458     def c_constr_native_complex_enum(self, struct_name, variant, c_params):
 459         ret = "(*env)->NewObject(env, " + struct_name + "_" + variant + "_class, " + struct_name + "_" + variant + "_meth"
 460         for param in c_params:
 461             ret = ret + ", " + param
 462         return ret + ")"
 463
 464     def native_c_map_trait(self, struct_name, field_vars, field_fns):
 465         out_java_trait = ""
 466         out_java = ""
 467
 468         # First generate most of the Java code, note that we need information about java method argument strings for C
 469         out_java_trait = out_java_trait + self.hu_struct_file_prefix
 470         out_java_trait = out_java_trait + "public class " + struct_name.replace("LDK","") + " extends CommonBase {\n"
 471         out_java_trait = out_java_trait + "\tfinal bindings." + struct_name + " bindings_instance;\n"
 472         out_java_trait = out_java_trait + "\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); bindings_instance = null; }\n"
 473         out_java_trait = out_java_trait + "\tprivate " + struct_name.replace("LDK", "") + "(bindings." + struct_name + " arg"
 474         for var in field_vars:
 475             if isinstance(var, ConvInfo):
 476                 out_java_trait = out_java_trait + ", " + var.java_hu_ty + " " + var.arg_name
 477             else:
 478                 out_java_trait = out_java_trait + ", bindings." + var[0] + " " + var[1]
 479         out_java_trait = out_java_trait + ") {\n"
 480         out_java_trait = out_java_trait + "\t\tsuper(bindings." + struct_name + "_new(arg"
 481         for var in field_vars:
 482             if isinstance(var, ConvInfo):
 483                 if var.from_hu_conv is not None:
 484                     out_java_trait = out_java_trait + ", " + var.from_hu_conv[0]
 485                 else:
 486                     out_java_trait = out_java_trait + ", " + var.arg_name
 487             else:
 488                 out_java_trait = out_java_trait + ", " + var[1]
 489         out_java_trait = out_java_trait + "));\n"
 490         out_java_trait = out_java_trait + "\t\tthis.ptrs_to.add(arg);\n"
 491         for var in field_vars:
 492             if isinstance(var, ConvInfo):
 493                 if var.from_hu_conv is not None and var.from_hu_conv[1] != "":
 494                     out_java_trait = out_java_trait + "\t\t" + var.from_hu_conv[1] + ";\n"
 495             else:
 496                 out_java_trait = out_java_trait + "\t\tthis.ptrs_to.add(" + var[1] + ");\n"
 497         out_java_trait = out_java_trait + "\t\tthis.bindings_instance = arg;\n"
 498         out_java_trait = out_java_trait + "\t}\n"
 499         out_java_trait = out_java_trait + "\t@Override @SuppressWarnings(\"deprecation\")\n"
 500         out_java_trait = out_java_trait + "\tprotected void finalize() throws Throwable {\n"
 501         out_java_trait = out_java_trait + "\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); } super.finalize();\n"
 502         out_java_trait = out_java_trait + "\t}\n\n"
 503
 504         java_trait_constr = "\tprivate static class " + struct_name + "Holder { " + struct_name.replace("LDK", "") + " held; }\n"
 505         java_trait_constr = java_trait_constr + "\tpublic static " + struct_name.replace("LDK", "") + " new_impl(" + struct_name.replace("LDK", "") + "Interface arg"
 506         for var in field_vars:
 507             if isinstance(var, ConvInfo):
 508                 java_trait_constr = java_trait_constr + ", " + var.java_hu_ty + " " + var.arg_name
 509             else:
 510                 # Ideally we'd be able to take any instance of the interface, but our C code can only represent
 511                 # Java-implemented version, so we require users pass a Java implementation here :/
 512                 java_trait_constr = java_trait_constr + ", " + var[0].replace("LDK", "") + "." + var[0].replace("LDK", "") + "Interface " + var[1] + "_impl"
 513         java_trait_constr = java_trait_constr + ") {\n\t\tfinal " + struct_name + "Holder impl_holder = new " + struct_name + "Holder();\n"
 514         java_trait_constr = java_trait_constr + "\t\timpl_holder.held = new " + struct_name.replace("LDK", "") + "(new bindings." + struct_name + "() {\n"
 515         out_java_trait = out_java_trait + "\tpublic static interface " + struct_name.replace("LDK", "") + "Interface {\n"
 516         out_java = out_java + "\tpublic interface " + struct_name + " {\n"
 517         java_meths = []
 518         for fn_line in field_fns:
 519             java_meth_descr = "("
 520             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 521                 out_java = out_java + "\t\t " + fn_line.ret_ty_info.java_ty + " " + fn_line.fn_name + "("
 522                 java_trait_constr = java_trait_constr + "\t\t\t@Override public " + fn_line.ret_ty_info.java_ty + " " + fn_line.fn_name + "("
 523                 out_java_trait = out_java_trait + "\t\t" + fn_line.ret_ty_info.java_hu_ty + " " + fn_line.fn_name + "("
 524
 525                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 526                     if idx >= 1:
 527                         out_java = out_java + ", "
 528                         java_trait_constr = java_trait_constr + ", "
 529                         out_java_trait = out_java_trait + ", "
 530                     out_java = out_java + arg_conv_info.java_ty + " " + arg_conv_info.arg_name
 531                     out_java_trait = out_java_trait + arg_conv_info.java_hu_ty + " " + arg_conv_info.arg_name
 532                     java_trait_constr = java_trait_constr + arg_conv_info.java_ty + " " + arg_conv_info.arg_name
 533                     java_meth_descr = java_meth_descr + arg_conv_info.java_fn_ty_arg
 534                 java_meth_descr = java_meth_descr + ")" + fn_line.ret_ty_info.java_fn_ty_arg
 535                 java_meths.append((fn_line.fn_name, java_meth_descr))
 536
 537                 out_java = out_java + ");\n"
 538                 out_java_trait = out_java_trait + ");\n"
 539                 java_trait_constr = java_trait_constr + ") {\n"
 540
 541                 for arg_info in fn_line.args_ty:
 542                     if arg_info.to_hu_conv is not None:
 543                         java_trait_constr = java_trait_constr + "\t\t\t\t" + arg_info.to_hu_conv.replace("\n", "\n\t\t\t\t") + "\n"
 544
 545                 if fn_line.ret_ty_info.java_ty != "void":
 546                     java_trait_constr = java_trait_constr + "\t\t\t\t" + fn_line.ret_ty_info.java_hu_ty + " ret = arg." + fn_line.fn_name + "("
 547                 else:
 548                     java_trait_constr = java_trait_constr + "\t\t\t\targ." + fn_line.fn_name + "("
 549
 550                 for idx, arg_info in enumerate(fn_line.args_ty):
 551                     if idx != 0:
 552                         java_trait_constr = java_trait_constr + ", "
 553                     if arg_info.to_hu_conv_name is not None:
 554                         java_trait_constr = java_trait_constr + arg_info.to_hu_conv_name
 555                     else:
 556                         java_trait_constr = java_trait_constr + arg_info.arg_name
 557
 558                 java_trait_constr = java_trait_constr + ");\n"
 559                 if fn_line.ret_ty_info.java_ty != "void":
 560                     if fn_line.ret_ty_info.from_hu_conv is not None:
 561                         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"
 562                         if fn_line.ret_ty_info.from_hu_conv[1] != "":
 563                             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"
 564                         #if fn_line.ret_ty_info.rust_obj in result_types:
 565                         java_trait_constr = java_trait_constr + "\t\t\t\treturn result;\n"
 566                     else:
 567                         java_trait_constr = java_trait_constr + "\t\t\t\treturn ret;\n"
 568                 java_trait_constr = java_trait_constr + "\t\t\t}\n"
 569         java_trait_constr = java_trait_constr + "\t\t}"
 570         for var in field_vars:
 571             if isinstance(var, ConvInfo):
 572                 java_trait_constr = java_trait_constr + ", " + var.arg_name
 573             else:
 574                 java_trait_constr = java_trait_constr + ", " + var[1] + ".new_impl(" + var[1] + "_impl).bindings_instance"
 575         out_java_trait = out_java_trait + "\t}\n"
 576         out_java_trait = out_java_trait + java_trait_constr + ");\n\t\treturn impl_holder.held;\n\t}\n"
 577
 578         out_java = out_java + "\t}\n"
 579
 580         out_java = out_java + "\tpublic static native long " + struct_name + "_new(" + struct_name + " impl"
 581         for var in field_vars:
 582             if isinstance(var, ConvInfo):
 583                 out_java = out_java + ", " + var.java_ty + " " + var.arg_name
 584             else:
 585                 out_java = out_java + ", " + var[0] + " " + var[1]
 586         out_java = out_java + ");\n"
 587
 588         # Now that we've written out our java code (and created java_meths), generate C
 589         out_c = "typedef struct " + struct_name + "_JCalls {\n"
 590         out_c = out_c + "\tatomic_size_t refcnt;\n"
 591         out_c = out_c + "\tJavaVM *vm;\n"
 592         out_c = out_c + "\tjweak o;\n"
 593         for var in field_vars:
 594             if isinstance(var, ConvInfo):
 595                 # We're a regular ol' field
 596                 pass
 597             else:
 598                 # We're a supertrait
 599                 out_c = out_c + "\t" + var[0] + "_JCalls* " + var[1] + ";\n"
 600         for fn in field_fns:
 601             if fn.fn_name != "free" and fn.fn_name != "clone":
 602                 out_c = out_c + "\tjmethodID " + fn.fn_name + "_meth;\n"
 603         out_c = out_c + "} " + struct_name + "_JCalls;\n"
 604
 605         for fn_line in field_fns:
 606             if fn_line.fn_name == "free":
 607                 out_c = out_c + "static void " + struct_name + "_JCalls_free(void* this_arg) {\n"
 608                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 609                 out_c = out_c + "\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n"
 610                 out_c = out_c + "\t\tJNIEnv *env;\n"
 611                 out_c = out_c + "\t\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_8) == JNI_OK);\n"
 612                 out_c = out_c + "\t\t(*env)->DeleteWeakGlobalRef(env, j_calls->o);\n"
 613                 out_c = out_c + "\t\tFREE(j_calls);\n"
 614                 out_c = out_c + "\t}\n}\n"
 615
 616         for idx, fn_line in enumerate(field_fns):
 617             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 618                 assert fn_line.ret_ty_info.ty_info.get_full_rust_ty()[1] == ""
 619                 out_c = out_c + fn_line.ret_ty_info.ty_info.get_full_rust_ty()[0] + " " + fn_line.fn_name + "_jcall("
 620                 if fn_line.self_is_const:
 621                     out_c = out_c + "const void* this_arg"
 622                 else:
 623                     out_c = out_c + "void* this_arg"
 624
 625                 for idx, arg in enumerate(fn_line.args_ty):
 626                     out_c = out_c + ", " + arg.ty_info.get_full_rust_ty()[0] + " " + arg.arg_name + arg.ty_info.get_full_rust_ty()[1]
 627
 628                 out_c = out_c + ") {\n"
 629                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 630                 out_c = out_c + "\tJNIEnv *env;\n"
 631                 out_c = out_c + "\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_8) == JNI_OK);\n"
 632
 633                 for arg_info in fn_line.args_ty:
 634                     if arg_info.ret_conv is not None:
 635                         out_c = out_c + "\t" + arg_info.ret_conv[0].replace('\n', '\n\t')
 636                         out_c = out_c + arg_info.arg_name
 637                         out_c = out_c + arg_info.ret_conv[1].replace('\n', '\n\t') + "\n"
 638
 639                 out_c = out_c + "\tjobject obj = (*env)->NewLocalRef(env, j_calls->o);\n\tCHECK(obj != NULL);\n"
 640                 if fn_line.ret_ty_info.c_ty.endswith("Array"):
 641                     out_c = out_c + "\t" + fn_line.ret_ty_info.c_ty + " arg = (*env)->CallObjectMethod(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 642                 elif not fn_line.ret_ty_info.passed_as_ptr:
 643                     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"
 644                 else:
 645                     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"
 646
 647                 for idx, arg_info in enumerate(fn_line.args_ty):
 648                     if arg_info.ret_conv is not None:
 649                         out_c = out_c + ", " + arg_info.ret_conv_name
 650                     else:
 651                         out_c = out_c + ", " + arg_info.arg_name
 652                 out_c = out_c + ");\n"
 653                 if fn_line.ret_ty_info.arg_conv is not None:
 654                     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"
 655
 656                 out_c = out_c + "}\n"
 657
 658         # Write out a clone function whether we need one or not, as we use them in moving to rust
 659         out_c = out_c + "static void* " + struct_name + "_JCalls_clone(const void* this_arg) {\n"
 660         out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 661         out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n"
 662         for var in field_vars:
 663             if not isinstance(var, ConvInfo):
 664                 out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->" + var[1] + "->refcnt, 1, memory_order_release);\n"
 665         out_c = out_c + "\treturn (void*) this_arg;\n"
 666         out_c = out_c + "}\n"
 667
 668         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_init (" + self.c_fn_args_pfx + ", jobject o"
 669         for var in field_vars:
 670             if isinstance(var, ConvInfo):
 671                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 672             else:
 673                 out_c = out_c + ", jobject " + var[1]
 674         out_c = out_c + ") {\n"
 675
 676         out_c = out_c + "\tjclass c = (*env)->GetObjectClass(env, o);\n"
 677         out_c = out_c + "\tCHECK(c != NULL);\n"
 678         out_c = out_c + "\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n"
 679         out_c = out_c + "\tatomic_init(&calls->refcnt, 1);\n"
 680         out_c = out_c + "\tDO_ASSERT((*env)->GetJavaVM(env, &calls->vm) == 0);\n"
 681         out_c = out_c + "\tcalls->o = (*env)->NewWeakGlobalRef(env, o);\n"
 682
 683         for (fn_name, java_meth_descr) in java_meths:
 684             if fn_name != "free" and fn_name != "clone":
 685                 out_c = out_c + "\tcalls->" + fn_name + "_meth = (*env)->GetMethodID(env, c, \"" + fn_name + "\", \"" + java_meth_descr + "\");\n"
 686                 out_c = out_c + "\tCHECK(calls->" + fn_name + "_meth != NULL);\n"
 687
 688         for var in field_vars:
 689             if isinstance(var, ConvInfo) and var.arg_conv is not None:
 690                 out_c = out_c + "\n\t" + var.arg_conv.replace("\n", "\n\t") +"\n"
 691         out_c = out_c + "\n\t" + struct_name + " ret = {\n"
 692         out_c = out_c + "\t\t.this_arg = (void*) calls,\n"
 693         for fn_line in field_fns:
 694             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 695                 out_c = out_c + "\t\t." + fn_line.fn_name + " = " + fn_line.fn_name + "_jcall,\n"
 696             elif fn_line.fn_name == "free":
 697                 out_c = out_c + "\t\t.free = " + struct_name + "_JCalls_free,\n"
 698             else:
 699                 out_c = out_c + "\t\t.clone = " + struct_name + "_JCalls_clone,\n"
 700         for var in field_vars:
 701             if isinstance(var, ConvInfo):
 702                 if var.arg_conv_name is not None:
 703                     out_c = out_c + "\t\t." + var.arg_name + " = " + var.arg_conv_name + ",\n"
 704                     out_c = out_c + "\t\t.set_" + var.arg_name + " = NULL,\n"
 705                 else:
 706                     out_c = out_c + "\t\t." + var.var_name + " = " + var.var_name + ",\n"
 707                     out_c = out_c + "\t\t.set_" + var.var_name + " = NULL,\n"
 708             else:
 709                 out_c = out_c + "\t\t." + var[1] + " = " + var[0] + "_init(env, clz, " + var[1] + "),\n"
 710         out_c = out_c + "\t};\n"
 711         for var in field_vars:
 712             if not isinstance(var, ConvInfo):
 713                 out_c = out_c + "\tcalls->" + var[1] + " = ret." + var[1] + ".this_arg;\n"
 714         out_c = out_c + "\treturn ret;\n"
 715         out_c = out_c + "}\n"
 716
 717         out_c = out_c + self.c_fn_ty_pfx + "long " + self.c_fn_name_define_pfx(struct_name + "_new", True) + "jobject o"
 718         for var in field_vars:
 719             if isinstance(var, ConvInfo):
 720                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 721             else:
 722                 out_c = out_c + ", jobject " + var[1]
 723         out_c = out_c + ") {\n"
 724         out_c = out_c + "\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n"
 725         out_c = out_c + "\t*res_ptr = " + struct_name + "_init(env, clz, o"
 726         for var in field_vars:
 727             if isinstance(var, ConvInfo):
 728                 out_c = out_c + ", " + var.arg_name
 729             else:
 730                 out_c = out_c + ", " + var[1]
 731         out_c = out_c + ");\n"
 732         out_c = out_c + "\treturn (long)res_ptr;\n"
 733         out_c = out_c + "}\n"
 734
 735         return (out_java, out_java_trait, out_c)
 736
 737     def trait_struct_inc_refcnt(self, ty_info):
 738         base_conv = "\nif (" + ty_info.var_name + "_conv.free == " + ty_info.rust_obj + "_JCalls_free) {\n"
 739         base_conv = base_conv + "\t// If this_arg is a JCalls struct, then we need to increment the refcnt in it.\n"
 740         base_conv = base_conv + "\t" + ty_info.rust_obj + "_JCalls_clone(" + ty_info.var_name + "_conv.this_arg);\n}"
 741         return base_conv
 742
 743     def map_complex_enum(self, struct_name, variant_list, camel_to_snake):
 744         java_hu_type = struct_name.replace("LDK", "")
 745         out_java_enum = ""
 746         out_java = ""
 747         out_c = ""
 748
 749         out_java_enum += (self.hu_struct_file_prefix)
 750         out_java_enum += ("public class " + java_hu_type + " extends CommonBase {\n")
 751         out_java_enum += ("\tprivate " + java_hu_type + "(Object _dummy, long ptr) { super(ptr); }\n")
 752         out_java_enum += ("\t@Override @SuppressWarnings(\"deprecation\")\n")
 753         out_java_enum += ("\tprotected void finalize() throws Throwable {\n")
 754         out_java_enum += ("\t\tsuper.finalize();\n")
 755         out_java_enum += ("\t\tif (ptr != 0) { bindings." + java_hu_type + "_free(ptr); }\n")
 756         out_java_enum += ("\t}\n")
 757         out_java_enum += ("\tstatic " + java_hu_type + " constr_from_ptr(long ptr) {\n")
 758         out_java_enum += ("\t\tbindings." + struct_name + " raw_val = bindings." + struct_name + "_ref_from_ptr(ptr);\n")
 759         java_hu_subclasses = ""
 760
 761         init_meth_jty_strs = {}
 762
 763         out_java +=  ("\tpublic static class " + struct_name + " {\n")
 764         out_java +=  ("\t\tprivate " + struct_name + "() {}\n")
 765         for var in variant_list:
 766             out_java +=  ("\t\tpublic final static class " + var.var_name + " extends " + struct_name + " {\n")
 767             java_hu_subclasses = java_hu_subclasses + "\tpublic final static class " + var.var_name + " extends " + java_hu_type + " {\n"
 768             out_java_enum += ("\t\tif (raw_val.getClass() == bindings." + struct_name + "." + var.var_name + ".class) {\n")
 769             out_java_enum += ("\t\t\treturn new " + var.var_name + "(ptr, (bindings." + struct_name + "." + var.var_name + ")raw_val);\n")
 770             init_meth_jty_str = ""
 771             init_meth_params = ""
 772             init_meth_body = ""
 773             hu_conv_body = ""
 774             for idx, field_ty in enumerate(var.fields):
 775                 out_java += ("\t\t\tpublic " + field_ty.java_ty + " " + field_ty.arg_name + ";\n")
 776                 java_hu_subclasses = java_hu_subclasses + "\t\tpublic final " + field_ty.java_hu_ty + " " + field_ty.arg_name + ";\n"
 777                 if field_ty.to_hu_conv is not None:
 778                     hu_conv_body = hu_conv_body + "\t\t\t" + field_ty.java_ty + " " + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
 779                     hu_conv_body = hu_conv_body + "\t\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
 780                     hu_conv_body = hu_conv_body + "\t\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
 781                 else:
 782                     hu_conv_body = hu_conv_body + "\t\t\tthis." + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
 783                 init_meth_jty_str = init_meth_jty_str + field_ty.java_fn_ty_arg
 784                 if idx > 0:
 785                     init_meth_params = init_meth_params + ", "
 786                 init_meth_params = init_meth_params + field_ty.java_ty + " " + field_ty.arg_name
 787                 init_meth_body = init_meth_body + "this." + field_ty.arg_name + " = " + field_ty.arg_name + "; "
 788             out_java +=  ("\t\t\t" + var.var_name + "(" + init_meth_params + ") { ")
 789             out_java +=  (init_meth_body)
 790             out_java +=  ("}\n")
 791             out_java += ("\t\t}\n")
 792             out_java_enum += ("\t\t}\n")
 793             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"
 794             java_hu_subclasses = java_hu_subclasses + hu_conv_body
 795             java_hu_subclasses = java_hu_subclasses + "\t\t}\n\t}\n"
 796             init_meth_jty_strs[var.var_name] = init_meth_jty_str
 797         out_java += ("\t\tstatic native void init();\n")
 798         out_java += ("\t}\n")
 799         out_java_enum += ("\t\tassert false; return null; // Unreachable without extending the (internal) bindings interface\n\t}\n\n")
 800         out_java_enum += (java_hu_subclasses)
 801         out_java += ("\tstatic { " + struct_name + ".init(); }\n")
 802         out_java += ("\tpublic static native " + struct_name + " " + struct_name + "_ref_from_ptr(long ptr);\n");
 803
 804         out_c += (self.c_complex_enum_pfx(struct_name, [x.var_name for x in variant_list], init_meth_jty_strs))
 805
 806         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")
 807         out_c += ("\t" + struct_name + " *obj = (" + struct_name + "*)ptr;\n")
 808         out_c += ("\tswitch(obj->tag) {\n")
 809         for var in variant_list:
 810             out_c += ("\t\tcase " + struct_name + "_" + var.var_name + ": {\n")
 811             c_params = []
 812             for idx, field_map in enumerate(var.fields):
 813                 if field_map.ret_conv is not None:
 814                     out_c += ("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
 815                     out_c += ("obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name)
 816                     out_c += (field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
 817                     c_params.append(field_map.ret_conv_name)
 818                 else:
 819                     c_params.append("obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name)
 820             out_c += ("\t\t\treturn " + self.c_constr_native_complex_enum(struct_name, var.var_name, c_params) + ";\n")
 821             out_c += ("\t\t}\n")
 822         out_c += ("\t\tdefault: abort();\n")
 823         out_c += ("\t}\n}\n")
 824         out_java_enum += ("}\n")
 825         return (out_java, out_java_enum, out_c)
 826
 827     def map_opaque_struct(self, struct_name):
 828         out_opaque_struct_human = ""
 829         out_opaque_struct_human += self.hu_struct_file_prefix
 830         out_opaque_struct_human += ("public class " + struct_name.replace("LDK","") + " extends CommonBase")
 831         if struct_name.startswith("LDKLocked"):
 832             out_opaque_struct_human += (" implements AutoCloseable")
 833         out_opaque_struct_human += (" {\n")
 834         out_opaque_struct_human += ("\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); }\n")
 835         if struct_name.startswith("LDKLocked"):
 836             out_opaque_struct_human += ("\t@Override public void close() {\n")
 837         else:
 838             out_opaque_struct_human += ("\t@Override @SuppressWarnings(\"deprecation\")\n")
 839             out_opaque_struct_human += ("\tprotected void finalize() throws Throwable {\n")
 840             out_opaque_struct_human += ("\t\tsuper.finalize();\n")
 841         out_opaque_struct_human += ("\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); }\n")
 842         out_opaque_struct_human += ("\t}\n\n")
 843         return out_opaque_struct_human
 844
 845
 846     def map_function(self, argument_types, c_call_string, method_name, return_type_info, struct_meth, default_constructor_args, takes_self, args_known, type_mapping_generator):
 847         out_java = ""
 848         out_c = ""
 849         out_java_struct = None
 850
 851         out_java += ("\tpublic static native ")
 852         out_c += (self.c_fn_ty_pfx)
 853         out_c += (return_type_info.c_ty)
 854         out_java += (return_type_info.java_ty)
 855         if return_type_info.ret_conv is not None:
 856             ret_conv_pfx, ret_conv_sfx = return_type_info.ret_conv
 857         out_java += (" " + method_name + "(")
 858         have_args = len(argument_types) > 1 or (len(argument_types) > 0 and argument_types[0].c_ty != "void")
 859         out_c += (" " + self.c_fn_name_define_pfx(method_name, have_args))
 860
 861         for idx, arg_conv_info in enumerate(argument_types):
 862             if idx != 0:
 863                 out_java += (", ")
 864                 out_c += (", ")
 865             if arg_conv_info.c_ty != "void":
 866                 out_c += (arg_conv_info.c_ty + " " + arg_conv_info.arg_name)
 867                 out_java += (arg_conv_info.java_ty + " " + arg_conv_info.arg_name)
 868
 869         out_java_struct = ""
 870         if not args_known:
 871             out_java_struct += ("\t// Skipped " + method_name + "\n")
 872         else:
 873             meth_n = method_name[len(struct_meth) + 1:]
 874             if not takes_self:
 875                 out_java_struct += (
 876                     "\tpublic static " + return_type_info.java_hu_ty + " constructor_" + meth_n + "(")
 877             else:
 878                 out_java_struct += ("\tpublic " + return_type_info.java_hu_ty + " " + meth_n + "(")
 879             for idx, arg in enumerate(argument_types):
 880                 if idx != 0:
 881                     if not takes_self or idx > 1:
 882                         out_java_struct += (", ")
 883                 elif takes_self:
 884                     continue
 885                 if arg.java_ty != "void":
 886                     if arg.arg_name in default_constructor_args:
 887                         for explode_idx, explode_arg in enumerate(default_constructor_args[arg.arg_name]):
 888                             if explode_idx != 0:
 889                                 out_java_struct += (", ")
 890                             out_java_struct += (
 891                                 explode_arg.java_hu_ty + " " + arg.arg_name + "_" + explode_arg.arg_name)
 892                     else:
 893                         out_java_struct += (arg.java_hu_ty + " " + arg.arg_name)
 894         out_java += (");\n")
 895         out_c += (") {\n")
 896         if out_java_struct is not None:
 897             out_java_struct += (") {\n")
 898         for info in argument_types:
 899             if info.arg_conv is not None:
 900                 out_c += ("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
 901         if return_type_info.ret_conv is not None:
 902             out_c += ("\t" + ret_conv_pfx.replace('\n', '\n\t'))
 903         elif return_type_info.c_ty != "void":
 904             out_c += ("\t" + return_type_info.c_ty + " ret_val = ")
 905         else:
 906             out_c += ("\t")
 907         if c_call_string is None:
 908             out_c += (method_name + "(")
 909         else:
 910             out_c += (c_call_string)
 911         for idx, info in enumerate(argument_types):
 912             if info.arg_conv_name is not None:
 913                 if idx != 0:
 914                     out_c += (", ")
 915                 elif c_call_string is not None:
 916                     continue
 917                 out_c += (info.arg_conv_name)
 918         out_c += (")")
 919         if return_type_info.ret_conv is not None:
 920             out_c += (ret_conv_sfx.replace('\n', '\n\t'))
 921         else:
 922             out_c += (";")
 923         for info in argument_types:
 924             if info.arg_conv_cleanup is not None:
 925                 out_c += ("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
 926         if return_type_info.ret_conv is not None:
 927             out_c += ("\n\treturn " + return_type_info.ret_conv_name + ";")
 928         elif return_type_info.c_ty != "void":
 929             out_c += ("\n\treturn ret_val;")
 930         out_c += ("\n}\n\n")
 931
 932         if args_known:
 933             out_java_struct += ("\t\t")
 934             if return_type_info.java_ty != "void":
 935                 out_java_struct += (return_type_info.java_ty + " ret = ")
 936             out_java_struct += ("bindings." + method_name + "(")
 937             for idx, info in enumerate(argument_types):
 938                 if idx != 0:
 939                     out_java_struct += (", ")
 940                 if idx == 0 and takes_self:
 941                     out_java_struct += ("this.ptr")
 942                 elif info.arg_name in default_constructor_args:
 943                     out_java_struct += ("bindings." + info.java_hu_ty + "_new(")
 944                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
 945                         if explode_idx != 0:
 946                             out_java_struct += (", ")
 947                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
 948                         if explode_arg.from_hu_conv is not None:
 949                             out_java_struct += (
 950                                 explode_arg.from_hu_conv[0].replace(explode_arg.arg_name, expl_arg_name))
 951                         else:
 952                             out_java_struct += (expl_arg_name)
 953                     out_java_struct += (")")
 954                 elif info.from_hu_conv is not None:
 955                     out_java_struct += (info.from_hu_conv[0])
 956                 else:
 957                     out_java_struct += (info.arg_name)
 958             out_java_struct += (");\n")
 959             if return_type_info.to_hu_conv is not None:
 960                 if not takes_self:
 961                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t").replace("this",
 962                                                                                                                return_type_info.to_hu_conv_name) + "\n")
 963                 else:
 964                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t") + "\n")
 965
 966             for idx, info in enumerate(argument_types):
 967                 if idx == 0 and takes_self:
 968                     pass
 969                 elif info.arg_name in default_constructor_args:
 970                     for explode_arg in default_constructor_args[info.arg_name]:
 971                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
 972                         if explode_arg.from_hu_conv is not None and return_type_info.to_hu_conv_name:
 973                             out_java_struct += ("\t\t" + explode_arg.from_hu_conv[1].replace(explode_arg.arg_name,
 974                                                                                                expl_arg_name).replace(
 975                                 "this", return_type_info.to_hu_conv_name) + ";\n")
 976                 elif info.from_hu_conv is not None and info.from_hu_conv[1] != "":
 977                     if not takes_self and return_type_info.to_hu_conv_name is not None:
 978                         out_java_struct += (
 979                             "\t\t" + info.from_hu_conv[1].replace("this", return_type_info.to_hu_conv_name) + ";\n")
 980                     else:
 981                         out_java_struct += ("\t\t" + info.from_hu_conv[1] + ";\n")
 982
 983             if return_type_info.to_hu_conv_name is not None:
 984                 out_java_struct += ("\t\treturn " + return_type_info.to_hu_conv_name + ";\n")
 985             elif return_type_info.java_ty != "void" and return_type_info.rust_obj != "LDK" + struct_meth:
 986                 out_java_struct += ("\t\treturn ret;\n")
 987             out_java_struct += ("\t}\n\n")
 988
 989         return (out_java, out_c, out_java_struct)