_ 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         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         size_t alloc_len;
 114 } allocation;
 115 static allocation* allocation_ll = NULL;
 116
 117 void* __real_malloc(size_t len);
 118 void* __real_calloc(size_t nmemb, size_t len);
 119 static void new_allocation(void* res, const char* struct_name, size_t len) {
 120         allocation* new_alloc = __real_malloc(sizeof(allocation));
 121         new_alloc->ptr = res;
 122         new_alloc->struct_name = struct_name;
 123         new_alloc->bt_len = backtrace(new_alloc->bt, BT_MAX);
 124         new_alloc->alloc_len = len;
 125         DO_ASSERT(mtx_lock(&allocation_mtx) == thrd_success);
 126         new_alloc->next = allocation_ll;
 127         allocation_ll = new_alloc;
 128         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
 129 }
 130 static void* MALLOC(size_t len, const char* struct_name) {
 131         void* res = __real_malloc(len);
 132         new_allocation(res, struct_name, len);
 133         return res;
 134 }
 135 void __real_free(void* ptr);
 136 static void alloc_freed(void* ptr) {
 137         allocation* p = NULL;
 138         DO_ASSERT(mtx_lock(&allocation_mtx) == thrd_success);
 139         allocation* it = allocation_ll;
 140         while (it->ptr != ptr) {
 141                 p = it; it = it->next;
 142                 if (it == NULL) {
 143                         fprintf(stderr, "Tried to free unknown pointer %p at:\\n", ptr);
 144                         void* bt[BT_MAX];
 145                         int bt_len = backtrace(bt, BT_MAX);
 146                         backtrace_symbols_fd(bt, bt_len, STDERR_FILENO);
 147                         fprintf(stderr, "\\n\\n");
 148                         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
 149                         return; // addrsan should catch malloc-unknown and print more info than we have
 150                 }
 151         }
 152         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
 153         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
 154         DO_ASSERT(it->ptr == ptr);
 155         __real_free(it);
 156 }
 157 static void FREE(void* ptr) {
 158         if ((long)ptr < 1024) return; // Rust loves to create pointers to the NULL page for dummys
 159         alloc_freed(ptr);
 160         __real_free(ptr);
 161 }
 162
 163 void* __wrap_malloc(size_t len) {
 164         void* res = __real_malloc(len);
 165         new_allocation(res, "malloc call", len);
 166         return res;
 167 }
 168 void* __wrap_calloc(size_t nmemb, size_t len) {
 169         void* res = __real_calloc(nmemb, len);
 170         new_allocation(res, "calloc call", len);
 171         return res;
 172 }
 173 void __wrap_free(void* ptr) {
 174         if (ptr == NULL) return;
 175         alloc_freed(ptr);
 176         __real_free(ptr);
 177 }
 178
 179 void* __real_realloc(void* ptr, size_t newlen);
 180 void* __wrap_realloc(void* ptr, size_t len) {
 181         if (ptr != NULL) alloc_freed(ptr);
 182         void* res = __real_realloc(ptr, len);
 183         new_allocation(res, "realloc call", len);
 184         return res;
 185 }
 186 void __wrap_reallocarray(void* ptr, size_t new_sz) {
 187         // Rust doesn't seem to use reallocarray currently
 188         DO_ASSERT(false);
 189 }
 190
 191 void __attribute__((destructor)) check_leaks() {
 192         size_t alloc_count = 0;
 193         size_t alloc_size = 0;
 194         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 195                 fprintf(stderr, "%s %p remains:\\n", a->struct_name, a->ptr);
 196                 backtrace_symbols_fd(a->bt, a->bt_len, STDERR_FILENO);
 197                 fprintf(stderr, "\\n\\n");
 198                 alloc_count++;
 199                 alloc_size += a->alloc_len;
 200         }
 201         fprintf(stderr, "%lu allocations remained for %lu bytes.\\n", alloc_count, alloc_size);
 202         DO_ASSERT(allocation_ll == NULL);
 203 }
 204 """
 205         self.c_file_pfx = self.c_file_pfx + """
 206 static jmethodID ordinal_meth = NULL;
 207 static jmethodID slicedef_meth = NULL;
 208 static jclass slicedef_cls = NULL;
 209 JNIEXPORT void Java_org_ldk_impl_bindings_init(JNIEnv * env, jclass _b, jclass enum_class, jclass slicedef_class) {
 210         ordinal_meth = (*env)->GetMethodID(env, enum_class, "ordinal", "()I");
 211         CHECK(ordinal_meth != NULL);
 212         slicedef_meth = (*env)->GetMethodID(env, slicedef_class, "<init>", "(JJJ)V");
 213         CHECK(slicedef_meth != NULL);
 214         slicedef_cls = (*env)->NewGlobalRef(env, slicedef_class);
 215         CHECK(slicedef_cls != NULL);
 216 }
 217
 218 JNIEXPORT jboolean JNICALL Java_org_ldk_impl_bindings_deref_1bool (JNIEnv * env, jclass _a, jlong ptr) {
 219         return *((bool*)ptr);
 220 }
 221 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_deref_1long (JNIEnv * env, jclass _a, jlong ptr) {
 222         return *((long*)ptr);
 223 }
 224 JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_free_1heap_1ptr (JNIEnv * env, jclass _a, jlong ptr) {
 225         FREE((void*)ptr);
 226 }
 227 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_read_1bytes (JNIEnv * env, jclass _b, jlong ptr, jlong len) {
 228         jbyteArray ret_arr = (*env)->NewByteArray(env, len);
 229         (*env)->SetByteArrayRegion(env, ret_arr, 0, len, (unsigned char*)ptr);
 230         return ret_arr;
 231 }
 232 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_get_1u8_1slice_1bytes (JNIEnv * env, jclass _b, jlong slice_ptr) {
 233         LDKu8slice *slice = (LDKu8slice*)slice_ptr;
 234         jbyteArray ret_arr = (*env)->NewByteArray(env, slice->datalen);
 235         (*env)->SetByteArrayRegion(env, ret_arr, 0, slice->datalen, slice->data);
 236         return ret_arr;
 237 }
 238 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_bytes_1to_1u8_1vec (JNIEnv * env, jclass _b, jbyteArray bytes) {
 239         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "LDKCVec_u8");
 240         vec->datalen = (*env)->GetArrayLength(env, bytes);
 241         vec->data = (uint8_t*)MALLOC(vec->datalen, "LDKCVec_u8Z Bytes");
 242         (*env)->GetByteArrayRegion (env, bytes, 0, vec->datalen, vec->data);
 243         return (long)vec;
 244 }
 245 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_txpointer_1get_1buffer (JNIEnv * env, jclass _b, jlong ptr) {
 246         LDKTransaction *txdata = (LDKTransaction*)ptr;
 247         LDKu8slice slice;
 248         slice.data = txdata->data;
 249         slice.datalen = txdata->datalen;
 250         return Java_org_ldk_impl_bindings_get_1u8_1slice_1bytes(env, _b, (long)&slice);
 251 }
 252 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_new_1txpointer_1copy_1data (JNIEnv * env, jclass _b, jbyteArray bytes) {
 253         LDKTransaction *txdata = (LDKTransaction*)MALLOC(sizeof(LDKTransaction), "LDKTransaction");
 254         txdata->datalen = (*env)->GetArrayLength(env, bytes);
 255         txdata->data = (uint8_t*)MALLOC(txdata->datalen, "Tx Data Bytes");
 256         txdata->data_is_owned = false;
 257         (*env)->GetByteArrayRegion (env, bytes, 0, txdata->datalen, txdata->data);
 258         return (long)txdata;
 259 }
 260 JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_txpointer_1free (JNIEnv * env, jclass _b, jlong ptr) {
 261         LDKTransaction *tx = (LDKTransaction*)ptr;
 262         tx->data_is_owned = true;
 263         Transaction_free(*tx);
 264         FREE((void*)ptr);
 265 }
 266 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_vec_1slice_1len (JNIEnv * env, jclass _a, jlong ptr) {
 267         // Check offsets of a few Vec types are all consistent as we're meant to be generic across types
 268         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_SignatureZ, datalen), "Vec<*> needs to be mapped identically");
 269         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_MessageSendEventZ, datalen), "Vec<*> needs to be mapped identically");
 270         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_EventZ, datalen), "Vec<*> needs to be mapped identically");
 271         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_C2Tuple_usizeTransactionZZ, datalen), "Vec<*> needs to be mapped identically");
 272         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)ptr;
 273         return (long)vec->datalen;
 274 }
 275 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_new_1empty_1slice_1vec (JNIEnv * env, jclass _b) {
 276         // Check sizes of a few Vec types are all consistent as we're meant to be generic across types
 277         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_SignatureZ), "Vec<*> needs to be mapped identically");
 278         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_MessageSendEventZ), "Vec<*> needs to be mapped identically");
 279         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_EventZ), "Vec<*> needs to be mapped identically");
 280         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_C2Tuple_usizeTransactionZZ), "Vec<*> needs to be mapped identically");
 281         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "Empty LDKCVec");
 282         vec->data = NULL;
 283         vec->datalen = 0;
 284         return (long)vec;
 285 }
 286
 287 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
 288 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
 289 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
 290 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
 291
 292 _Static_assert(sizeof(jlong) == sizeof(int64_t), "We assume that j-types are the same as C types");
 293 _Static_assert(sizeof(jbyte) == sizeof(char), "We assume that j-types are the same as C types");
 294 _Static_assert(sizeof(void*) <= 8, "Pointers must fit into 64 bits");
 295
 296 typedef jlongArray int64_tArray;
 297 typedef jbyteArray int8_tArray;
 298
 299 static inline jstring str_ref_to_java(JNIEnv *env, const char* chars, size_t len) {
 300         // Sadly we need to create a temporary because Java can't accept a char* without a 0-terminator
 301         char* err_buf = MALLOC(len + 1, "str conv buf");
 302         memcpy(err_buf, chars, len);
 303         err_buf[len] = 0;
 304         jstring err_conv = (*env)->NewStringUTF(env, chars);
 305         FREE(err_buf);
 306         return err_conv;
 307 }
 308 """
 309
 310         self.hu_struct_file_prefix = """package org.ldk.structs;
 311
 312 import org.ldk.impl.bindings;
 313 import org.ldk.enums.*;
 314 import org.ldk.util.*;
 315 import java.util.Arrays;
 316
 317 @SuppressWarnings("unchecked") // We correctly assign various generic arrays
 318 """
 319         self.c_fn_ty_pfx = "JNIEXPORT "
 320         self.c_fn_args_pfx = "JNIEnv *env, jclass clz"
 321         self.file_ext = ".java"
 322         self.ptr_c_ty = "int64_t"
 323         self.ptr_native_ty = "long"
 324         self.result_c_ty = "jclass"
 325         self.ptr_arr = "jobjectArray"
 326         self.get_native_arr_len_call = ("(*env)->GetArrayLength(env, ", ")")
 327
 328     def release_native_arr_ptr_call(self, ty_info, arr_var, arr_ptr_var):
 329         if ty_info.subty is None or not ty_info.subty.c_ty.endswith("Array"):
 330             return "(*env)->ReleasePrimitiveArrayCritical(env, " + arr_var + ", " + arr_ptr_var + ", 0)"
 331         return None
 332     def create_native_arr_call(self, arr_len, ty_info):
 333         if ty_info.c_ty == "int8_tArray":
 334             return "(*env)->NewByteArray(env, " + arr_len + ")"
 335         elif ty_info.subty.c_ty.endswith("Array"):
 336             clz_var = ty_info.java_fn_ty_arg[1:].replace("[", "arr_of_")
 337             self.c_array_class_caches.add(clz_var)
 338             return "(*env)->NewObjectArray(env, " + arr_len + ", " + clz_var + "_clz, NULL);\n"
 339         else:
 340             return "(*env)->New" + ty_info.java_ty.strip("[]").title() + "Array(env, " + arr_len + ")"
 341     def set_native_arr_contents(self, arr_name, arr_len, ty_info):
 342         if ty_info.c_ty == "int8_tArray":
 343             return ("(*env)->SetByteArrayRegion(env, " + arr_name + ", 0, " + arr_len + ", ", ")")
 344         else:
 345             assert False
 346     def get_native_arr_contents(self, arr_name, dest_name, arr_len, ty_info, copy):
 347         if ty_info.c_ty == "int8_tArray":
 348             if copy:
 349                 return "(*env)->GetByteArrayRegion(env, " + arr_name + ", 0, " + arr_len + ", " + dest_name + ")"
 350             else:
 351                 return "(*env)->GetByteArrayElements (env, " + arr_name + ", NULL)"
 352         elif not ty_info.java_ty[:len(ty_info.java_ty) - 2].endswith("[]"):
 353             return "(*env)->Get" + ty_info.subty.java_ty.title() + "ArrayElements (env, " + arr_name + ", NULL)"
 354         else:
 355             return None
 356     def get_native_arr_elem(self, arr_name, idxc, ty_info):
 357         if self.get_native_arr_contents(arr_name, "", "", ty_info, False) is None:
 358             return "(*env)->GetObjectArrayElement(env, " + arr_name + ", " + idxc + ")"
 359         else:
 360             assert False # Only called if above is None
 361     def get_native_arr_ptr_call(self, ty_info):
 362         if ty_info.subty is not None and ty_info.subty.c_ty.endswith("Array"):
 363             return None
 364         return ("(*env)->GetPrimitiveArrayCritical(env, ", ", NULL)")
 365     def get_native_arr_entry_call(self, ty_info, arr_name, idxc, entry_access):
 366         if ty_info.subty is None or not ty_info.subty.c_ty.endswith("Array"):
 367             return None
 368         return "(*env)->SetObjectArrayElement(env, " + arr_name + ", " + idxc + ", " + entry_access + ")"
 369     def cleanup_native_arr_ref_contents(self, arr_name, dest_name, arr_len, ty_info):
 370         if ty_info.c_ty == "int8_tArray":
 371             return "(*env)->ReleaseByteArrayElements(env, " + arr_name + ", (int8_t*)" + dest_name + ", 0);"
 372         else:
 373             return "(*env)->Release" + ty_info.java_ty.strip("[]").title() + "ArrayElements(env, " + arr_name + ", " + dest_name + ", 0)"
 374
 375     def str_ref_to_c_call(self, var_name, str_len):
 376         return "str_ref_to_java(env, " + var_name + ", " + str_len + ")"
 377
 378     def c_fn_name_define_pfx(self, fn_name, has_args):
 379         if has_args:
 380             return "JNICALL Java_org_ldk_impl_bindings_" + fn_name.replace("_", "_1") + "(JNIEnv *env, jclass clz, "
 381         return "JNICALL Java_org_ldk_impl_bindings_" + fn_name.replace("_", "_1") + "(JNIEnv *env, jclass clz"
 382
 383     def init_str(self):
 384         res = ""
 385         for ty in self.c_array_class_caches:
 386             res = res + "static jclass " + ty + "_clz = NULL;\n"
 387         res = res + "JNIEXPORT void Java_org_ldk_impl_bindings_init_1class_1cache(JNIEnv * env, jclass clz) {\n"
 388         for ty in self.c_array_class_caches:
 389             res = res + "\t" + ty + "_clz = (*env)->FindClass(env, \"" + ty.replace("arr_of_", "[") + "\");\n"
 390             res = res + "\tCHECK(" + ty + "_clz != NULL);\n"
 391             res = res + "\t" + ty + "_clz = (*env)->NewGlobalRef(env, " + ty + "_clz);\n"
 392         res = res + "}\n"
 393         return res
 394
 395     def native_c_unitary_enum_map(self, struct_name, variants):
 396         out_java_enum = "package org.ldk.enums;\n\n"
 397         out_java = ""
 398         out_c = ""
 399         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_from_java(" + self.c_fn_args_pfx + ") {\n"
 400         out_c = out_c + "\tswitch ((*env)->CallIntMethod(env, clz, ordinal_meth)) {\n"
 401
 402         out_java_enum = out_java_enum + "public enum " + struct_name + " {\n"
 403         ord_v = 0
 404         for var in variants:
 405             out_java_enum = out_java_enum + "\t" + var + ",\n"
 406             out_c = out_c + "\t\tcase %d: return %s;\n" % (ord_v, var)
 407             ord_v = ord_v + 1
 408         out_java_enum = out_java_enum + "\t; static native void init();\n"
 409         out_java_enum = out_java_enum + "\tstatic { init(); }\n"
 410         out_java_enum = out_java_enum + "}"
 411         out_java = out_java + "\tstatic { " + struct_name + ".values(); /* Force enum statics to run */ }\n"
 412         out_c = out_c + "\t}\n"
 413         out_c = out_c + "\tabort();\n"
 414         out_c = out_c + "}\n"
 415
 416         out_c = out_c + "static jclass " + struct_name + "_class = NULL;\n"
 417         for var in variants:
 418             out_c = out_c + "static jfieldID " + struct_name + "_" + var + " = NULL;\n"
 419         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"
 420         out_c = out_c + "\t" + struct_name + "_class = (*env)->NewGlobalRef(env, clz);\n"
 421         out_c = out_c + "\tCHECK(" + struct_name + "_class != NULL);\n"
 422         for var in variants:
 423             out_c = out_c + "\t" + struct_name + "_" + var + " = (*env)->GetStaticFieldID(env, " + struct_name + "_class, \"" + var + "\", \"Lorg/ldk/enums/" + struct_name + ";\");\n"
 424             out_c = out_c + "\tCHECK(" + struct_name + "_" + var + " != NULL);\n"
 425         out_c = out_c + "}\n"
 426         out_c = out_c + "static inline jclass " + struct_name + "_to_java(JNIEnv *env, " + struct_name + " val) {\n"
 427         out_c = out_c + "\tswitch (val) {\n"
 428         ord_v = 0
 429         for var in variants:
 430             out_c = out_c + "\t\tcase " + var + ":\n"
 431             out_c = out_c + "\t\t\treturn (*env)->GetStaticObjectField(env, " + struct_name + "_class, " + struct_name + "_" + var + ");\n"
 432             ord_v = ord_v + 1
 433         out_c = out_c + "\t\tdefault: abort();\n"
 434         out_c = out_c + "\t}\n"
 435         out_c = out_c + "}\n\n"
 436
 437         return (out_c, out_java_enum, out_java)
 438
 439     def c_unitary_enum_to_native_call(self, ty_info):
 440         return (ty_info.rust_obj + "_to_java(env, ", ")")
 441     def native_unitary_enum_to_c_call(self, ty_info):
 442         return (ty_info.rust_obj + "_from_java(env, ", ")")
 443
 444     def c_complex_enum_pfx(self, struct_name, variants, init_meth_jty_strs):
 445         out_c = ""
 446         for var in variants:
 447             out_c = out_c + "static jclass " + struct_name + "_" + var + "_class = NULL;\n"
 448             out_c = out_c + "static jmethodID " + struct_name + "_" + var + "_meth = NULL;\n"
 449         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"
 450         for var_name in variants:
 451             out_c = out_c + "\t" + struct_name + "_" + var_name + "_class =\n"
 452             out_c = out_c + "\t\t(*env)->NewGlobalRef(env, (*env)->FindClass(env, \"Lorg/ldk/impl/bindings$" + struct_name + "$" + var_name + ";\"));\n"
 453             out_c = out_c + "\tCHECK(" + struct_name + "_" + var_name + "_class != NULL);\n"
 454             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"
 455             out_c = out_c + "\tCHECK(" + struct_name + "_" + var_name + "_meth != NULL);\n"
 456         out_c = out_c + "}\n"
 457         return out_c
 458
 459     def c_complex_enum_pass_ty(self, struct_name):
 460         return "jobject"
 461
 462     def c_constr_native_complex_enum(self, struct_name, variant, c_params):
 463         ret = "(*env)->NewObject(env, " + struct_name + "_" + variant + "_class, " + struct_name + "_" + variant + "_meth"
 464         for param in c_params:
 465             ret = ret + ", " + param
 466         return ret + ")"
 467
 468     def native_c_map_trait(self, struct_name, field_vars, field_fns):
 469         out_java_trait = ""
 470         out_java = ""
 471
 472         # First generate most of the Java code, note that we need information about java method argument strings for C
 473         out_java_trait = out_java_trait + self.hu_struct_file_prefix
 474         out_java_trait = out_java_trait + "public class " + struct_name.replace("LDK","") + " extends CommonBase {\n"
 475         out_java_trait = out_java_trait + "\tfinal bindings." + struct_name + " bindings_instance;\n"
 476         out_java_trait = out_java_trait + "\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); bindings_instance = null; }\n"
 477         out_java_trait = out_java_trait + "\tprivate " + struct_name.replace("LDK", "") + "(bindings." + struct_name + " arg"
 478         for var in field_vars:
 479             if isinstance(var, ConvInfo):
 480                 out_java_trait = out_java_trait + ", " + var.java_hu_ty + " " + var.arg_name
 481             else:
 482                 out_java_trait = out_java_trait + ", bindings." + var[0] + " " + var[1]
 483         out_java_trait = out_java_trait + ") {\n"
 484         out_java_trait = out_java_trait + "\t\tsuper(bindings." + struct_name + "_new(arg"
 485         for var in field_vars:
 486             if isinstance(var, ConvInfo):
 487                 if var.from_hu_conv is not None:
 488                     out_java_trait = out_java_trait + ", " + var.from_hu_conv[0]
 489                 else:
 490                     out_java_trait = out_java_trait + ", " + var.arg_name
 491             else:
 492                 out_java_trait = out_java_trait + ", " + var[1]
 493         out_java_trait = out_java_trait + "));\n"
 494         out_java_trait = out_java_trait + "\t\tthis.ptrs_to.add(arg);\n"
 495         for var in field_vars:
 496             if isinstance(var, ConvInfo):
 497                 if var.from_hu_conv is not None and var.from_hu_conv[1] != "":
 498                     out_java_trait = out_java_trait + "\t\t" + var.from_hu_conv[1].replace("\n", "\n\t\t") + ";\n"
 499             else:
 500                 out_java_trait = out_java_trait + "\t\tthis.ptrs_to.add(" + var[1] + ");\n"
 501         out_java_trait = out_java_trait + "\t\tthis.bindings_instance = arg;\n"
 502         out_java_trait = out_java_trait + "\t}\n"
 503         out_java_trait = out_java_trait + "\t@Override @SuppressWarnings(\"deprecation\")\n"
 504         out_java_trait = out_java_trait + "\tprotected void finalize() throws Throwable {\n"
 505         out_java_trait = out_java_trait + "\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); } super.finalize();\n"
 506         out_java_trait = out_java_trait + "\t}\n\n"
 507
 508         java_trait_constr = "\tprivate static class " + struct_name + "Holder { " + struct_name.replace("LDK", "") + " held; }\n"
 509         java_trait_constr = java_trait_constr + "\tpublic static " + struct_name.replace("LDK", "") + " new_impl(" + struct_name.replace("LDK", "") + "Interface arg"
 510         for var in field_vars:
 511             if isinstance(var, ConvInfo):
 512                 java_trait_constr = java_trait_constr + ", " + var.java_hu_ty + " " + var.arg_name
 513             else:
 514                 # Ideally we'd be able to take any instance of the interface, but our C code can only represent
 515                 # Java-implemented version, so we require users pass a Java implementation here :/
 516                 java_trait_constr = java_trait_constr + ", " + var[0].replace("LDK", "") + "." + var[0].replace("LDK", "") + "Interface " + var[1] + "_impl"
 517         java_trait_constr = java_trait_constr + ") {\n\t\tfinal " + struct_name + "Holder impl_holder = new " + struct_name + "Holder();\n"
 518         java_trait_constr = java_trait_constr + "\t\timpl_holder.held = new " + struct_name.replace("LDK", "") + "(new bindings." + struct_name + "() {\n"
 519         out_java_trait = out_java_trait + "\tpublic static interface " + struct_name.replace("LDK", "") + "Interface {\n"
 520         out_java = out_java + "\tpublic interface " + struct_name + " {\n"
 521         java_meths = []
 522         for fn_line in field_fns:
 523             java_meth_descr = "("
 524             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 525                 out_java = out_java + "\t\t " + fn_line.ret_ty_info.java_ty + " " + fn_line.fn_name + "("
 526                 java_trait_constr = java_trait_constr + "\t\t\t@Override public " + fn_line.ret_ty_info.java_ty + " " + fn_line.fn_name + "("
 527                 out_java_trait = out_java_trait + "\t\t" + fn_line.ret_ty_info.java_hu_ty + " " + fn_line.fn_name + "("
 528
 529                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 530                     if idx >= 1:
 531                         out_java = out_java + ", "
 532                         java_trait_constr = java_trait_constr + ", "
 533                         out_java_trait = out_java_trait + ", "
 534                     out_java = out_java + arg_conv_info.java_ty + " " + arg_conv_info.arg_name
 535                     out_java_trait = out_java_trait + arg_conv_info.java_hu_ty + " " + arg_conv_info.arg_name
 536                     java_trait_constr = java_trait_constr + arg_conv_info.java_ty + " " + arg_conv_info.arg_name
 537                     java_meth_descr = java_meth_descr + arg_conv_info.java_fn_ty_arg
 538                 java_meth_descr = java_meth_descr + ")" + fn_line.ret_ty_info.java_fn_ty_arg
 539                 java_meths.append((fn_line.fn_name, java_meth_descr))
 540
 541                 out_java = out_java + ");\n"
 542                 out_java_trait = out_java_trait + ");\n"
 543                 java_trait_constr = java_trait_constr + ") {\n"
 544
 545                 for arg_info in fn_line.args_ty:
 546                     if arg_info.to_hu_conv is not None:
 547                         java_trait_constr = java_trait_constr + "\t\t\t\t" + arg_info.to_hu_conv.replace("\n", "\n\t\t\t\t") + "\n"
 548
 549                 if fn_line.ret_ty_info.java_ty != "void":
 550                     java_trait_constr = java_trait_constr + "\t\t\t\t" + fn_line.ret_ty_info.java_hu_ty + " ret = arg." + fn_line.fn_name + "("
 551                 else:
 552                     java_trait_constr = java_trait_constr + "\t\t\t\targ." + fn_line.fn_name + "("
 553
 554                 for idx, arg_info in enumerate(fn_line.args_ty):
 555                     if idx != 0:
 556                         java_trait_constr = java_trait_constr + ", "
 557                     if arg_info.to_hu_conv_name is not None:
 558                         java_trait_constr = java_trait_constr + arg_info.to_hu_conv_name
 559                     else:
 560                         java_trait_constr = java_trait_constr + arg_info.arg_name
 561
 562                 java_trait_constr = java_trait_constr + ");\n"
 563                 if fn_line.ret_ty_info.java_ty != "void":
 564                     if fn_line.ret_ty_info.from_hu_conv is not None:
 565                         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"
 566                         if fn_line.ret_ty_info.from_hu_conv[1] != "":
 567                             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"
 568                         #if fn_line.ret_ty_info.rust_obj in result_types:
 569                         java_trait_constr = java_trait_constr + "\t\t\t\treturn result;\n"
 570                     else:
 571                         java_trait_constr = java_trait_constr + "\t\t\t\treturn ret;\n"
 572                 java_trait_constr = java_trait_constr + "\t\t\t}\n"
 573         java_trait_constr = java_trait_constr + "\t\t}"
 574         for var in field_vars:
 575             if isinstance(var, ConvInfo):
 576                 java_trait_constr = java_trait_constr + ", " + var.arg_name
 577             else:
 578                 java_trait_constr = java_trait_constr + ", " + var[1] + ".new_impl(" + var[1] + "_impl).bindings_instance"
 579         out_java_trait = out_java_trait + "\t}\n"
 580         out_java_trait = out_java_trait + java_trait_constr + ");\n\t\treturn impl_holder.held;\n\t}\n"
 581
 582         out_java = out_java + "\t}\n"
 583
 584         out_java = out_java + "\tpublic static native long " + struct_name + "_new(" + struct_name + " impl"
 585         for var in field_vars:
 586             if isinstance(var, ConvInfo):
 587                 out_java = out_java + ", " + var.java_ty + " " + var.arg_name
 588             else:
 589                 out_java = out_java + ", " + var[0] + " " + var[1]
 590         out_java = out_java + ");\n"
 591
 592         # Now that we've written out our java code (and created java_meths), generate C
 593         out_c = "typedef struct " + struct_name + "_JCalls {\n"
 594         out_c = out_c + "\tatomic_size_t refcnt;\n"
 595         out_c = out_c + "\tJavaVM *vm;\n"
 596         out_c = out_c + "\tjweak o;\n"
 597         for var in field_vars:
 598             if isinstance(var, ConvInfo):
 599                 # We're a regular ol' field
 600                 pass
 601             else:
 602                 # We're a supertrait
 603                 out_c = out_c + "\t" + var[0] + "_JCalls* " + var[1] + ";\n"
 604         for fn in field_fns:
 605             if fn.fn_name != "free" and fn.fn_name != "clone":
 606                 out_c = out_c + "\tjmethodID " + fn.fn_name + "_meth;\n"
 607         out_c = out_c + "} " + struct_name + "_JCalls;\n"
 608
 609         for fn_line in field_fns:
 610             if fn_line.fn_name == "free":
 611                 out_c = out_c + "static void " + struct_name + "_JCalls_free(void* this_arg) {\n"
 612                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 613                 out_c = out_c + "\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n"
 614                 out_c = out_c + "\t\tJNIEnv *env;\n"
 615                 out_c = out_c + "\t\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_8) == JNI_OK);\n"
 616                 out_c = out_c + "\t\t(*env)->DeleteWeakGlobalRef(env, j_calls->o);\n"
 617                 out_c = out_c + "\t\tFREE(j_calls);\n"
 618                 out_c = out_c + "\t}\n}\n"
 619
 620         for idx, fn_line in enumerate(field_fns):
 621             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 622                 assert fn_line.ret_ty_info.ty_info.get_full_rust_ty()[1] == ""
 623                 out_c = out_c + fn_line.ret_ty_info.ty_info.get_full_rust_ty()[0] + " " + fn_line.fn_name + "_jcall("
 624                 if fn_line.self_is_const:
 625                     out_c = out_c + "const void* this_arg"
 626                 else:
 627                     out_c = out_c + "void* this_arg"
 628
 629                 for idx, arg in enumerate(fn_line.args_ty):
 630                     out_c = out_c + ", " + arg.ty_info.get_full_rust_ty()[0] + " " + arg.arg_name + arg.ty_info.get_full_rust_ty()[1]
 631
 632                 out_c = out_c + ") {\n"
 633                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 634                 out_c = out_c + "\tJNIEnv *env;\n"
 635                 out_c = out_c + "\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_8) == JNI_OK);\n"
 636
 637                 for arg_info in fn_line.args_ty:
 638                     if arg_info.ret_conv is not None:
 639                         out_c = out_c + "\t" + arg_info.ret_conv[0].replace('\n', '\n\t')
 640                         out_c = out_c + arg_info.arg_name
 641                         out_c = out_c + arg_info.ret_conv[1].replace('\n', '\n\t') + "\n"
 642
 643                 out_c = out_c + "\tjobject obj = (*env)->NewLocalRef(env, j_calls->o);\n\tCHECK(obj != NULL);\n"
 644                 if fn_line.ret_ty_info.c_ty.endswith("Array"):
 645                     out_c = out_c + "\t" + fn_line.ret_ty_info.c_ty + " arg = (*env)->CallObjectMethod(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 646                 elif not fn_line.ret_ty_info.passed_as_ptr:
 647                     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"
 648                 else:
 649                     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"
 650
 651                 for idx, arg_info in enumerate(fn_line.args_ty):
 652                     if arg_info.ret_conv is not None:
 653                         out_c = out_c + ", " + arg_info.ret_conv_name
 654                     else:
 655                         out_c = out_c + ", " + arg_info.arg_name
 656                 out_c = out_c + ");\n"
 657                 if fn_line.ret_ty_info.arg_conv is not None:
 658                     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"
 659
 660                 out_c = out_c + "}\n"
 661
 662         # Write out a clone function whether we need one or not, as we use them in moving to rust
 663         out_c = out_c + "static void* " + struct_name + "_JCalls_clone(const void* this_arg) {\n"
 664         out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 665         out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n"
 666         for var in field_vars:
 667             if not isinstance(var, ConvInfo):
 668                 out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->" + var[1] + "->refcnt, 1, memory_order_release);\n"
 669         out_c = out_c + "\treturn (void*) this_arg;\n"
 670         out_c = out_c + "}\n"
 671
 672         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_init (" + self.c_fn_args_pfx + ", jobject o"
 673         for var in field_vars:
 674             if isinstance(var, ConvInfo):
 675                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 676             else:
 677                 out_c = out_c + ", jobject " + var[1]
 678         out_c = out_c + ") {\n"
 679
 680         out_c = out_c + "\tjclass c = (*env)->GetObjectClass(env, o);\n"
 681         out_c = out_c + "\tCHECK(c != NULL);\n"
 682         out_c = out_c + "\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n"
 683         out_c = out_c + "\tatomic_init(&calls->refcnt, 1);\n"
 684         out_c = out_c + "\tDO_ASSERT((*env)->GetJavaVM(env, &calls->vm) == 0);\n"
 685         out_c = out_c + "\tcalls->o = (*env)->NewWeakGlobalRef(env, o);\n"
 686
 687         for (fn_name, java_meth_descr) in java_meths:
 688             if fn_name != "free" and fn_name != "clone":
 689                 out_c = out_c + "\tcalls->" + fn_name + "_meth = (*env)->GetMethodID(env, c, \"" + fn_name + "\", \"" + java_meth_descr + "\");\n"
 690                 out_c = out_c + "\tCHECK(calls->" + fn_name + "_meth != NULL);\n"
 691
 692         for var in field_vars:
 693             if isinstance(var, ConvInfo) and var.arg_conv is not None:
 694                 out_c = out_c + "\n\t" + var.arg_conv.replace("\n", "\n\t") +"\n"
 695         out_c = out_c + "\n\t" + struct_name + " ret = {\n"
 696         out_c = out_c + "\t\t.this_arg = (void*) calls,\n"
 697         for fn_line in field_fns:
 698             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 699                 out_c = out_c + "\t\t." + fn_line.fn_name + " = " + fn_line.fn_name + "_jcall,\n"
 700             elif fn_line.fn_name == "free":
 701                 out_c = out_c + "\t\t.free = " + struct_name + "_JCalls_free,\n"
 702             else:
 703                 out_c = out_c + "\t\t.clone = " + struct_name + "_JCalls_clone,\n"
 704         for var in field_vars:
 705             if isinstance(var, ConvInfo):
 706                 if var.arg_conv_name is not None:
 707                     out_c = out_c + "\t\t." + var.arg_name + " = " + var.arg_conv_name + ",\n"
 708                     out_c = out_c + "\t\t.set_" + var.arg_name + " = NULL,\n"
 709                 else:
 710                     out_c = out_c + "\t\t." + var.var_name + " = " + var.var_name + ",\n"
 711                     out_c = out_c + "\t\t.set_" + var.var_name + " = NULL,\n"
 712             else:
 713                 out_c = out_c + "\t\t." + var[1] + " = " + var[0] + "_init(env, clz, " + var[1] + "),\n"
 714         out_c = out_c + "\t};\n"
 715         for var in field_vars:
 716             if not isinstance(var, ConvInfo):
 717                 out_c = out_c + "\tcalls->" + var[1] + " = ret." + var[1] + ".this_arg;\n"
 718         out_c = out_c + "\treturn ret;\n"
 719         out_c = out_c + "}\n"
 720
 721         out_c = out_c + self.c_fn_ty_pfx + "long " + self.c_fn_name_define_pfx(struct_name + "_new", True) + "jobject o"
 722         for var in field_vars:
 723             if isinstance(var, ConvInfo):
 724                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 725             else:
 726                 out_c = out_c + ", jobject " + var[1]
 727         out_c = out_c + ") {\n"
 728         out_c = out_c + "\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n"
 729         out_c = out_c + "\t*res_ptr = " + struct_name + "_init(env, clz, o"
 730         for var in field_vars:
 731             if isinstance(var, ConvInfo):
 732                 out_c = out_c + ", " + var.arg_name
 733             else:
 734                 out_c = out_c + ", " + var[1]
 735         out_c = out_c + ");\n"
 736         out_c = out_c + "\treturn (long)res_ptr;\n"
 737         out_c = out_c + "}\n"
 738
 739         return (out_java, out_java_trait, out_c)
 740
 741     def trait_struct_inc_refcnt(self, ty_info):
 742         base_conv = "\nif (" + ty_info.var_name + "_conv.free == " + ty_info.rust_obj + "_JCalls_free) {\n"
 743         base_conv = base_conv + "\t// If this_arg is a JCalls struct, then we need to increment the refcnt in it.\n"
 744         base_conv = base_conv + "\t" + ty_info.rust_obj + "_JCalls_clone(" + ty_info.var_name + "_conv.this_arg);\n}"
 745         return base_conv
 746
 747     def map_complex_enum(self, struct_name, variant_list, camel_to_snake):
 748         java_hu_type = struct_name.replace("LDK", "")
 749         out_java_enum = ""
 750         out_java = ""
 751         out_c = ""
 752
 753         out_java_enum += (self.hu_struct_file_prefix)
 754         out_java_enum += ("public class " + java_hu_type + " extends CommonBase {\n")
 755         out_java_enum += ("\tprivate " + java_hu_type + "(Object _dummy, long ptr) { super(ptr); }\n")
 756         out_java_enum += ("\t@Override @SuppressWarnings(\"deprecation\")\n")
 757         out_java_enum += ("\tprotected void finalize() throws Throwable {\n")
 758         out_java_enum += ("\t\tsuper.finalize();\n")
 759         out_java_enum += ("\t\tif (ptr != 0) { bindings." + java_hu_type + "_free(ptr); }\n")
 760         out_java_enum += ("\t}\n")
 761         out_java_enum += ("\tstatic " + java_hu_type + " constr_from_ptr(long ptr) {\n")
 762         out_java_enum += ("\t\tbindings." + struct_name + " raw_val = bindings." + struct_name + "_ref_from_ptr(ptr);\n")
 763         java_hu_subclasses = ""
 764
 765         init_meth_jty_strs = {}
 766
 767         out_java +=  ("\tpublic static class " + struct_name + " {\n")
 768         out_java +=  ("\t\tprivate " + struct_name + "() {}\n")
 769         for var in variant_list:
 770             out_java +=  ("\t\tpublic final static class " + var.var_name + " extends " + struct_name + " {\n")
 771             java_hu_subclasses = java_hu_subclasses + "\tpublic final static class " + var.var_name + " extends " + java_hu_type + " {\n"
 772             out_java_enum += ("\t\tif (raw_val.getClass() == bindings." + struct_name + "." + var.var_name + ".class) {\n")
 773             out_java_enum += ("\t\t\treturn new " + var.var_name + "(ptr, (bindings." + struct_name + "." + var.var_name + ")raw_val);\n")
 774             init_meth_jty_str = ""
 775             init_meth_params = ""
 776             init_meth_body = ""
 777             hu_conv_body = ""
 778             for idx, field_ty in enumerate(var.fields):
 779                 out_java += ("\t\t\tpublic " + field_ty.java_ty + " " + field_ty.arg_name + ";\n")
 780                 java_hu_subclasses = java_hu_subclasses + "\t\tpublic final " + field_ty.java_hu_ty + " " + field_ty.arg_name + ";\n"
 781                 if field_ty.to_hu_conv is not None:
 782                     hu_conv_body = hu_conv_body + "\t\t\t" + field_ty.java_ty + " " + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
 783                     hu_conv_body = hu_conv_body + "\t\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
 784                     hu_conv_body = hu_conv_body + "\t\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
 785                 else:
 786                     hu_conv_body = hu_conv_body + "\t\t\tthis." + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
 787                 init_meth_jty_str = init_meth_jty_str + field_ty.java_fn_ty_arg
 788                 if idx > 0:
 789                     init_meth_params = init_meth_params + ", "
 790                 init_meth_params = init_meth_params + field_ty.java_ty + " " + field_ty.arg_name
 791                 init_meth_body = init_meth_body + "this." + field_ty.arg_name + " = " + field_ty.arg_name + "; "
 792             out_java +=  ("\t\t\t" + var.var_name + "(" + init_meth_params + ") { ")
 793             out_java +=  (init_meth_body)
 794             out_java +=  ("}\n")
 795             out_java += ("\t\t}\n")
 796             out_java_enum += ("\t\t}\n")
 797             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"
 798             java_hu_subclasses = java_hu_subclasses + hu_conv_body
 799             java_hu_subclasses = java_hu_subclasses + "\t\t}\n\t}\n"
 800             init_meth_jty_strs[var.var_name] = init_meth_jty_str
 801         out_java += ("\t\tstatic native void init();\n")
 802         out_java += ("\t}\n")
 803         out_java_enum += ("\t\tassert false; return null; // Unreachable without extending the (internal) bindings interface\n\t}\n\n")
 804         out_java_enum += (java_hu_subclasses)
 805         out_java += ("\tstatic { " + struct_name + ".init(); }\n")
 806         out_java += ("\tpublic static native " + struct_name + " " + struct_name + "_ref_from_ptr(long ptr);\n");
 807
 808         out_c += (self.c_complex_enum_pfx(struct_name, [x.var_name for x in variant_list], init_meth_jty_strs))
 809
 810         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")
 811         out_c += ("\t" + struct_name + " *obj = (" + struct_name + "*)ptr;\n")
 812         out_c += ("\tswitch(obj->tag) {\n")
 813         for var in variant_list:
 814             out_c += ("\t\tcase " + struct_name + "_" + var.var_name + ": {\n")
 815             c_params = []
 816             for idx, field_map in enumerate(var.fields):
 817                 if field_map.ret_conv is not None:
 818                     out_c += ("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
 819                     out_c += ("obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name)
 820                     out_c += (field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
 821                     c_params.append(field_map.ret_conv_name)
 822                 else:
 823                     c_params.append("obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name)
 824             out_c += ("\t\t\treturn " + self.c_constr_native_complex_enum(struct_name, var.var_name, c_params) + ";\n")
 825             out_c += ("\t\t}\n")
 826         out_c += ("\t\tdefault: abort();\n")
 827         out_c += ("\t}\n}\n")
 828         out_java_enum += ("}\n")
 829         return (out_java, out_java_enum, out_c)
 830
 831     def map_opaque_struct(self, struct_name):
 832         out_opaque_struct_human = ""
 833         out_opaque_struct_human += self.hu_struct_file_prefix
 834         out_opaque_struct_human += ("public class " + struct_name.replace("LDK","") + " extends CommonBase")
 835         if struct_name.startswith("LDKLocked"):
 836             out_opaque_struct_human += (" implements AutoCloseable")
 837         out_opaque_struct_human += (" {\n")
 838         out_opaque_struct_human += ("\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); }\n")
 839         if struct_name.startswith("LDKLocked"):
 840             out_opaque_struct_human += ("\t@Override public void close() {\n")
 841         else:
 842             out_opaque_struct_human += ("\t@Override @SuppressWarnings(\"deprecation\")\n")
 843             out_opaque_struct_human += ("\tprotected void finalize() throws Throwable {\n")
 844             out_opaque_struct_human += ("\t\tsuper.finalize();\n")
 845         out_opaque_struct_human += ("\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); }\n")
 846         out_opaque_struct_human += ("\t}\n\n")
 847         return out_opaque_struct_human
 848
 849
 850     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):
 851         out_java = ""
 852         out_c = ""
 853         out_java_struct = None
 854
 855         out_java += ("\tpublic static native ")
 856         out_c += (self.c_fn_ty_pfx)
 857         out_c += (return_type_info.c_ty)
 858         out_java += (return_type_info.java_ty)
 859         if return_type_info.ret_conv is not None:
 860             ret_conv_pfx, ret_conv_sfx = return_type_info.ret_conv
 861         out_java += (" " + method_name + "(")
 862         have_args = len(argument_types) > 1 or (len(argument_types) > 0 and argument_types[0].c_ty != "void")
 863         out_c += (" " + self.c_fn_name_define_pfx(method_name, have_args))
 864
 865         for idx, arg_conv_info in enumerate(argument_types):
 866             if idx != 0:
 867                 out_java += (", ")
 868                 out_c += (", ")
 869             if arg_conv_info.c_ty != "void":
 870                 out_c += (arg_conv_info.c_ty + " " + arg_conv_info.arg_name)
 871                 out_java += (arg_conv_info.java_ty + " " + arg_conv_info.arg_name)
 872
 873         out_java_struct = ""
 874         if not args_known:
 875             out_java_struct += ("\t// Skipped " + method_name + "\n")
 876         else:
 877             meth_n = method_name[len(struct_meth) + 1:]
 878             if not takes_self:
 879                 out_java_struct += (
 880                     "\tpublic static " + return_type_info.java_hu_ty + " constructor_" + meth_n + "(")
 881             else:
 882                 out_java_struct += ("\tpublic " + return_type_info.java_hu_ty + " " + meth_n + "(")
 883             for idx, arg in enumerate(argument_types):
 884                 if idx != 0:
 885                     if not takes_self or idx > 1:
 886                         out_java_struct += (", ")
 887                 elif takes_self:
 888                     continue
 889                 if arg.java_ty != "void":
 890                     if arg.arg_name in default_constructor_args:
 891                         for explode_idx, explode_arg in enumerate(default_constructor_args[arg.arg_name]):
 892                             if explode_idx != 0:
 893                                 out_java_struct += (", ")
 894                             out_java_struct += (
 895                                 explode_arg.java_hu_ty + " " + arg.arg_name + "_" + explode_arg.arg_name)
 896                     else:
 897                         out_java_struct += (arg.java_hu_ty + " " + arg.arg_name)
 898         out_java += (");\n")
 899         out_c += (") {\n")
 900         if out_java_struct is not None:
 901             out_java_struct += (") {\n")
 902         for info in argument_types:
 903             if info.arg_conv is not None:
 904                 out_c += ("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
 905         if return_type_info.ret_conv is not None:
 906             out_c += ("\t" + ret_conv_pfx.replace('\n', '\n\t'))
 907         elif return_type_info.c_ty != "void":
 908             out_c += ("\t" + return_type_info.c_ty + " ret_val = ")
 909         else:
 910             out_c += ("\t")
 911         if c_call_string is None:
 912             out_c += (method_name + "(")
 913         else:
 914             out_c += (c_call_string)
 915         for idx, info in enumerate(argument_types):
 916             if info.arg_conv_name is not None:
 917                 if idx != 0:
 918                     out_c += (", ")
 919                 elif c_call_string is not None:
 920                     continue
 921                 out_c += (info.arg_conv_name)
 922         out_c += (")")
 923         if return_type_info.ret_conv is not None:
 924             out_c += (ret_conv_sfx.replace('\n', '\n\t'))
 925         else:
 926             out_c += (";")
 927         for info in argument_types:
 928             if info.arg_conv_cleanup is not None:
 929                 out_c += ("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
 930         if return_type_info.ret_conv is not None:
 931             out_c += ("\n\treturn " + return_type_info.ret_conv_name + ";")
 932         elif return_type_info.c_ty != "void":
 933             out_c += ("\n\treturn ret_val;")
 934         out_c += ("\n}\n\n")
 935
 936         if args_known:
 937             out_java_struct += ("\t\t")
 938             if return_type_info.java_ty != "void":
 939                 out_java_struct += (return_type_info.java_ty + " ret = ")
 940             out_java_struct += ("bindings." + method_name + "(")
 941             for idx, info in enumerate(argument_types):
 942                 if idx != 0:
 943                     out_java_struct += (", ")
 944                 if idx == 0 and takes_self:
 945                     out_java_struct += ("this.ptr")
 946                 elif info.arg_name in default_constructor_args:
 947                     out_java_struct += ("bindings." + info.java_hu_ty + "_new(")
 948                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
 949                         if explode_idx != 0:
 950                             out_java_struct += (", ")
 951                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
 952                         if explode_arg.from_hu_conv is not None:
 953                             out_java_struct += (
 954                                 explode_arg.from_hu_conv[0].replace(explode_arg.arg_name, expl_arg_name))
 955                         else:
 956                             out_java_struct += (expl_arg_name)
 957                     out_java_struct += (")")
 958                 elif info.from_hu_conv is not None:
 959                     out_java_struct += (info.from_hu_conv[0])
 960                 else:
 961                     out_java_struct += (info.arg_name)
 962             out_java_struct += (");\n")
 963             if return_type_info.to_hu_conv is not None:
 964                 if not takes_self:
 965                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t").replace("this",
 966                                                                                                                return_type_info.to_hu_conv_name) + "\n")
 967                 else:
 968                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t") + "\n")
 969
 970             for idx, info in enumerate(argument_types):
 971                 if idx == 0 and takes_self:
 972                     pass
 973                 elif info.arg_name in default_constructor_args:
 974                     for explode_arg in default_constructor_args[info.arg_name]:
 975                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
 976                         if explode_arg.from_hu_conv is not None and return_type_info.to_hu_conv_name:
 977                             out_java_struct += ("\t\t" + explode_arg.from_hu_conv[1].replace(explode_arg.arg_name,
 978                                                                                                expl_arg_name).replace(
 979                                 "this", return_type_info.to_hu_conv_name) + ";\n")
 980                 elif info.from_hu_conv is not None and info.from_hu_conv[1] != "":
 981                     if not takes_self and return_type_info.to_hu_conv_name is not None:
 982                         out_java_struct += (
 983                             "\t\t" + info.from_hu_conv[1].replace("this", return_type_info.to_hu_conv_name).replace("\n", "\n\t\t") + ";\n")
 984                     else:
 985                         out_java_struct += ("\t\t" + info.from_hu_conv[1].replace("\n", "\n\t\t") + ";\n")
 986
 987             if return_type_info.to_hu_conv_name is not None:
 988                 out_java_struct += ("\t\treturn " + return_type_info.to_hu_conv_name + ";\n")
 989             elif return_type_info.java_ty != "void" and return_type_info.rust_obj != "LDK" + struct_meth:
 990                 out_java_struct += ("\t\treturn ret;\n")
 991             out_java_struct += ("\t}\n\n")
 992
 993         return (out_java, out_c, out_java_struct)