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

   1 from bindingstypes import *
   2
   3 class Consts:
   4     def __init__(self, DEBUG: bool, **kwargs):
   5         self.c_array_class_caches = set()
   6         self.c_type_map = dict(
   7             uint8_t = ['byte'],
   8             uint16_t = ['short'],
   9             uint32_t = ['int'],
  10             uint64_t = ['long'],
  11         )
  12
  13         self.to_hu_conv_templates = dict(
  14             ptr = '{human_type} {var_name}_hu_conv = new {human_type}(null, {var_name});',
  15             default = '{human_type} {var_name}_hu_conv = new {human_type}(null, {var_name});'
  16         )
  17
  18         self.bindings_header = """package org.ldk.impl;
  19 import org.ldk.enums.*;
  20
  21 public class bindings {
  22         public static class VecOrSliceDef {
  23                 public long dataptr;
  24                 public long datalen;
  25                 public long stride;
  26                 public VecOrSliceDef(long dataptr, long datalen, long stride) {
  27                         this.dataptr = dataptr; this.datalen = datalen; this.stride = stride;
  28                 }
  29         }
  30         static {
  31                 System.loadLibrary(\"lightningjni\");
  32                 init(java.lang.Enum.class, VecOrSliceDef.class);
  33                 init_class_cache();
  34         }
  35         static native void init(java.lang.Class c, java.lang.Class slicedef);
  36         static native void init_class_cache();
  37
  38         public static native boolean deref_bool(long ptr);
  39         public static native long deref_long(long ptr);
  40         public static native void free_heap_ptr(long ptr);
  41         public static native byte[] read_bytes(long ptr, long len);
  42         public static native byte[] get_u8_slice_bytes(long slice_ptr);
  43         public static native long bytes_to_u8_vec(byte[] bytes);
  44         public static native long new_txpointer_copy_data(byte[] txdata);
  45         public static native void txpointer_free(long ptr);
  46         public static native byte[] txpointer_get_buffer(long ptr);
  47         public static native long vec_slice_len(long vec);
  48         public static native long new_empty_slice_vec();
  49
  50 """
  51
  52         self.bindings_footer = "}\n"
  53
  54         self.common_base = """package org.ldk.structs;
  55 import java.util.LinkedList;
  56 class CommonBase {
  57         long ptr;
  58         LinkedList<Object> ptrs_to = new LinkedList();
  59         protected CommonBase(long ptr) { this.ptr = ptr; }
  60         public long _test_only_get_ptr() { return this.ptr; }
  61 }
  62 """
  63
  64         self.c_file_pfx = """#include \"org_ldk_impl_bindings.h\"
  65 #include <rust_types.h>
  66 #include <lightning.h>
  67 #include <string.h>
  68 #include <stdatomic.h>
  69 #include <stdlib.h>
  70 """
  71
  72         if not DEBUG:
  73             self.c_file_pfx = self.c_file_pfx + """#define MALLOC(a, _) malloc(a)
  74 #define FREE(p) if ((long)(p) > 1024) { free(p); }
  75 #define DO_ASSERT(a) (void)(a)
  76 #define CHECK(a)
  77 """
  78         else:
  79             self.c_file_pfx = self.c_file_pfx + """#include <assert.h>
  80 // Always run a, then assert it is true:
  81 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
  82 // Assert a is true or do nothing
  83 #define CHECK(a) DO_ASSERT(a)
  84
  85 // Running a leak check across all the allocations and frees of the JDK is a mess,
  86 // so instead we implement our own naive leak checker here, relying on the -wrap
  87 // linker option to wrap malloc/calloc/realloc/free, tracking everyhing allocated
  88 // and free'd in Rust or C across the generated bindings shared library.
  89 #include <threads.h>
  90 #include <execinfo.h>
  91 #include <unistd.h>
  92 static mtx_t allocation_mtx;
  93
  94 void __attribute__((constructor)) init_mtx() {
  95         DO_ASSERT(mtx_init(&allocation_mtx, mtx_plain) == thrd_success);
  96 }
  97
  98 #define BT_MAX 128
  99 typedef struct allocation {
 100         struct allocation* next;
 101         void* ptr;
 102         const char* struct_name;
 103         void* bt[BT_MAX];
 104         int bt_len;
 105 } allocation;
 106 static allocation* allocation_ll = NULL;
 107
 108 void* __real_malloc(size_t len);
 109 void* __real_calloc(size_t nmemb, size_t len);
 110 static void new_allocation(void* res, const char* struct_name) {
 111         allocation* new_alloc = __real_malloc(sizeof(allocation));
 112         new_alloc->ptr = res;
 113         new_alloc->struct_name = struct_name;
 114         new_alloc->bt_len = backtrace(new_alloc->bt, BT_MAX);
 115         DO_ASSERT(mtx_lock(&allocation_mtx) == thrd_success);
 116         new_alloc->next = allocation_ll;
 117         allocation_ll = new_alloc;
 118         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
 119 }
 120 static void* MALLOC(size_t len, const char* struct_name) {
 121         void* res = __real_malloc(len);
 122         new_allocation(res, struct_name);
 123         return res;
 124 }
 125 void __real_free(void* ptr);
 126 static void alloc_freed(void* ptr) {
 127         allocation* p = NULL;
 128         DO_ASSERT(mtx_lock(&allocation_mtx) == thrd_success);
 129         allocation* it = allocation_ll;
 130         while (it->ptr != ptr) {
 131                 p = it; it = it->next;
 132                 if (it == NULL) {
 133                         fprintf(stderr, "Tried to free unknown pointer %p at:\\n", ptr);
 134                         void* bt[BT_MAX];
 135                         int bt_len = backtrace(bt, BT_MAX);
 136                         backtrace_symbols_fd(bt, bt_len, STDERR_FILENO);
 137                         fprintf(stderr, "\\n\\n");
 138                         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
 139                         return; // addrsan should catch malloc-unknown and print more info than we have
 140                 }
 141         }
 142         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
 143         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
 144         DO_ASSERT(it->ptr == ptr);
 145         __real_free(it);
 146 }
 147 static void FREE(void* ptr) {
 148         if ((long)ptr < 1024) return; // Rust loves to create pointers to the NULL page for dummys
 149         alloc_freed(ptr);
 150         __real_free(ptr);
 151 }
 152
 153 void* __wrap_malloc(size_t len) {
 154         void* res = __real_malloc(len);
 155         new_allocation(res, "malloc call");
 156         return res;
 157 }
 158 void* __wrap_calloc(size_t nmemb, size_t len) {
 159         void* res = __real_calloc(nmemb, len);
 160         new_allocation(res, "calloc call");
 161         return res;
 162 }
 163 void __wrap_free(void* ptr) {
 164         if (ptr == NULL) return;
 165         alloc_freed(ptr);
 166         __real_free(ptr);
 167 }
 168
 169 void* __real_realloc(void* ptr, size_t newlen);
 170 void* __wrap_realloc(void* ptr, size_t len) {
 171         if (ptr != NULL) alloc_freed(ptr);
 172         void* res = __real_realloc(ptr, len);
 173         new_allocation(res, "realloc call");
 174         return res;
 175 }
 176 void __wrap_reallocarray(void* ptr, size_t new_sz) {
 177         // Rust doesn't seem to use reallocarray currently
 178         DO_ASSERT(false);
 179 }
 180
 181 void __attribute__((destructor)) check_leaks() {
 182         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 183                 fprintf(stderr, "%s %p remains:\\n", a->struct_name, a->ptr);
 184                 backtrace_symbols_fd(a->bt, a->bt_len, STDERR_FILENO);
 185                 fprintf(stderr, "\\n\\n");
 186         }
 187         DO_ASSERT(allocation_ll == NULL);
 188 }
 189 """
 190         self.c_file_pfx = self.c_file_pfx + """
 191 static jmethodID ordinal_meth = NULL;
 192 static jmethodID slicedef_meth = NULL;
 193 static jclass slicedef_cls = NULL;
 194 JNIEXPORT void Java_org_ldk_impl_bindings_init(JNIEnv * env, jclass _b, jclass enum_class, jclass slicedef_class) {
 195         ordinal_meth = (*env)->GetMethodID(env, enum_class, "ordinal", "()I");
 196         CHECK(ordinal_meth != NULL);
 197         slicedef_meth = (*env)->GetMethodID(env, slicedef_class, "<init>", "(JJJ)V");
 198         CHECK(slicedef_meth != NULL);
 199         slicedef_cls = (*env)->NewGlobalRef(env, slicedef_class);
 200         CHECK(slicedef_cls != NULL);
 201 }
 202
 203 JNIEXPORT jboolean JNICALL Java_org_ldk_impl_bindings_deref_1bool (JNIEnv * env, jclass _a, jlong ptr) {
 204         return *((bool*)ptr);
 205 }
 206 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_deref_1long (JNIEnv * env, jclass _a, jlong ptr) {
 207         return *((long*)ptr);
 208 }
 209 JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_free_1heap_1ptr (JNIEnv * env, jclass _a, jlong ptr) {
 210         FREE((void*)ptr);
 211 }
 212 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_read_1bytes (JNIEnv * env, jclass _b, jlong ptr, jlong len) {
 213         jbyteArray ret_arr = (*env)->NewByteArray(env, len);
 214         (*env)->SetByteArrayRegion(env, ret_arr, 0, len, (unsigned char*)ptr);
 215         return ret_arr;
 216 }
 217 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_get_1u8_1slice_1bytes (JNIEnv * env, jclass _b, jlong slice_ptr) {
 218         LDKu8slice *slice = (LDKu8slice*)slice_ptr;
 219         jbyteArray ret_arr = (*env)->NewByteArray(env, slice->datalen);
 220         (*env)->SetByteArrayRegion(env, ret_arr, 0, slice->datalen, slice->data);
 221         return ret_arr;
 222 }
 223 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_bytes_1to_1u8_1vec (JNIEnv * env, jclass _b, jbyteArray bytes) {
 224         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "LDKCVec_u8");
 225         vec->datalen = (*env)->GetArrayLength(env, bytes);
 226         vec->data = (uint8_t*)MALLOC(vec->datalen, "LDKCVec_u8Z Bytes");
 227         (*env)->GetByteArrayRegion (env, bytes, 0, vec->datalen, vec->data);
 228         return (long)vec;
 229 }
 230 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_txpointer_1get_1buffer (JNIEnv * env, jclass _b, jlong ptr) {
 231         LDKTransaction *txdata = (LDKTransaction*)ptr;
 232         LDKu8slice slice;
 233         slice.data = txdata->data;
 234         slice.datalen = txdata->datalen;
 235         return Java_org_ldk_impl_bindings_get_1u8_1slice_1bytes(env, _b, (long)&slice);
 236 }
 237 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_new_1txpointer_1copy_1data (JNIEnv * env, jclass _b, jbyteArray bytes) {
 238         LDKTransaction *txdata = (LDKTransaction*)MALLOC(sizeof(LDKTransaction), "LDKTransaction");
 239         txdata->datalen = (*env)->GetArrayLength(env, bytes);
 240         txdata->data = (uint8_t*)MALLOC(txdata->datalen, "Tx Data Bytes");
 241         txdata->data_is_owned = false;
 242         (*env)->GetByteArrayRegion (env, bytes, 0, txdata->datalen, txdata->data);
 243         return (long)txdata;
 244 }
 245 JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_txpointer_1free (JNIEnv * env, jclass _b, jlong ptr) {
 246         LDKTransaction *tx = (LDKTransaction*)ptr;
 247         tx->data_is_owned = true;
 248         Transaction_free(*tx);
 249         FREE((void*)ptr);
 250 }
 251 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_vec_1slice_1len (JNIEnv * env, jclass _a, jlong ptr) {
 252         // Check offsets of a few Vec types are all consistent as we're meant to be generic across types
 253         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_SignatureZ, datalen), "Vec<*> needs to be mapped identically");
 254         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_MessageSendEventZ, datalen), "Vec<*> needs to be mapped identically");
 255         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_EventZ, datalen), "Vec<*> needs to be mapped identically");
 256         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_C2Tuple_usizeTransactionZZ, datalen), "Vec<*> needs to be mapped identically");
 257         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)ptr;
 258         return (long)vec->datalen;
 259 }
 260 JNIEXPORT long JNICALL Java_org_ldk_impl_bindings_new_1empty_1slice_1vec (JNIEnv * env, jclass _b) {
 261         // Check sizes of a few Vec types are all consistent as we're meant to be generic across types
 262         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_SignatureZ), "Vec<*> needs to be mapped identically");
 263         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_MessageSendEventZ), "Vec<*> needs to be mapped identically");
 264         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_EventZ), "Vec<*> needs to be mapped identically");
 265         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_C2Tuple_usizeTransactionZZ), "Vec<*> needs to be mapped identically");
 266         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "Empty LDKCVec");
 267         vec->data = NULL;
 268         vec->datalen = 0;
 269         return (long)vec;
 270 }
 271
 272 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
 273 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
 274 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
 275 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
 276
 277 _Static_assert(sizeof(jlong) == sizeof(int64_t), "We assume that j-types are the same as C types");
 278 _Static_assert(sizeof(jbyte) == sizeof(char), "We assume that j-types are the same as C types");
 279 _Static_assert(sizeof(void*) <= 8, "Pointers must fit into 64 bits");
 280
 281 typedef jlongArray int64_tArray;
 282 typedef jbyteArray int8_tArray;
 283
 284 """
 285
 286         self.hu_struct_file_prefix = """package org.ldk.structs;
 287
 288 import org.ldk.impl.bindings;
 289 import org.ldk.enums.*;
 290 import org.ldk.util.*;
 291 import java.util.Arrays;
 292
 293 @SuppressWarnings("unchecked") // We correctly assign various generic arrays
 294 """
 295         self.c_fn_ty_pfx = "JNIEXPORT "
 296         self.c_fn_name_pfx = "JNICALL Java_org_ldk_impl_bindings_"
 297         self.c_fn_args_pfx = "JNIEnv *env, jclass clz"
 298         self.file_ext = ".java"
 299         self.ptr_c_ty = "int64_t"
 300         self.ptr_native_ty = "long"
 301         self.result_c_ty = "jclass"
 302         self.owned_str_to_c_call = ("(*env)->NewStringUTF(env, ", ")")
 303         self.ptr_arr = "jobjectArray"
 304         self.get_native_arr_len_call = ("(*env)->GetArrayLength(env, ", ")")
 305
 306     def release_native_arr_ptr_call(self, ty_info, arr_var, arr_ptr_var):
 307         if ty_info.subty is None or not ty_info.subty.c_ty.endswith("Array"):
 308             return "(*env)->ReleasePrimitiveArrayCritical(env, " + arr_var + ", " + arr_ptr_var + ", 0)"
 309         return None
 310     def create_native_arr_call(self, arr_len, ty_info):
 311         if ty_info.c_ty == "int8_tArray":
 312             return "(*env)->NewByteArray(env, " + arr_len + ")"
 313         elif ty_info.subty.c_ty.endswith("Array"):
 314             clz_var = ty_info.java_fn_ty_arg[1:].replace("[", "arr_of_")
 315             self.c_array_class_caches.add(clz_var)
 316             return "(*env)->NewObjectArray(env, " + arr_len + ", " + clz_var + "_clz, NULL);\n"
 317         else:
 318             return "(*env)->New" + ty_info.java_ty.strip("[]").title() + "Array(env, " + arr_len + ")"
 319     def set_native_arr_contents(self, arr_name, arr_len, ty_info):
 320         if ty_info.c_ty == "int8_tArray":
 321             return ("(*env)->SetByteArrayRegion(env, " + arr_name + ", 0, " + arr_len + ", ", ")")
 322         else:
 323             assert False
 324     def get_native_arr_contents(self, arr_name, dest_name, arr_len, ty_info, copy):
 325         if ty_info.c_ty == "int8_tArray":
 326             if copy:
 327                 return "(*env)->GetByteArrayRegion(env, " + arr_name + ", 0, " + arr_len + ", " + dest_name + ")"
 328             else:
 329                 return "(*env)->GetByteArrayElements (env, " + arr_name + ", NULL)"
 330         elif not ty_info.java_ty[:len(ty_info.java_ty) - 2].endswith("[]"):
 331             return "(*env)->Get" + ty_info.subty.java_ty.title() + "ArrayElements (env, " + arr_name + ", NULL)"
 332         else:
 333             return None
 334     def get_native_arr_elem(self, arr_name, idxc, ty_info):
 335         if self.get_native_arr_contents(arr_name, "", "", ty_info, False) is None:
 336             return "(*env)->GetObjectArrayElement(env, " + arr_name + ", " + idxc + ")"
 337         else:
 338             assert False # Only called if above is None
 339     def get_native_arr_ptr_call(self, ty_info):
 340         if ty_info.subty is not None and ty_info.subty.c_ty.endswith("Array"):
 341             return None
 342         return ("(*env)->GetPrimitiveArrayCritical(env, ", ", NULL)")
 343     def get_native_arr_entry_call(self, ty_info, arr_name, idxc, entry_access):
 344         if ty_info.subty is None or not ty_info.subty.c_ty.endswith("Array"):
 345             return None
 346         return "(*env)->SetObjectArrayElement(env, " + arr_name + ", " + idxc + ", " + entry_access + ")"
 347     def cleanup_native_arr_ref_contents(self, arr_name, dest_name, arr_len, ty_info):
 348         if ty_info.c_ty == "int8_tArray":
 349             return "(*env)->ReleaseByteArrayElements(env, " + arr_name + ", (int8_t*)" + dest_name + ", 0);"
 350         else:
 351             return "(*env)->Release" + ty_info.java_ty.strip("[]").title() + "ArrayElements(env, " + arr_name + ", " + dest_name + ", 0)"
 352
 353     def init_str(self):
 354         res = ""
 355         for ty in self.c_array_class_caches:
 356             res = res + "static jclass " + ty + "_clz = NULL;\n"
 357         res = res + "JNIEXPORT void Java_org_ldk_impl_bindings_init_1class_1cache(JNIEnv * env, jclass clz) {\n"
 358         for ty in self.c_array_class_caches:
 359             res = res + "\t" + ty + "_clz = (*env)->FindClass(env, \"" + ty.replace("arr_of_", "[") + "\");\n"
 360             res = res + "\tCHECK(" + ty + "_clz != NULL);\n"
 361             res = res + "\t" + ty + "_clz = (*env)->NewGlobalRef(env, " + ty + "_clz);\n"
 362         res = res + "}\n"
 363         return res
 364
 365     def native_c_unitary_enum_map(self, struct_name, variants):
 366         out_java_enum = "package org.ldk.enums;\n\n"
 367         out_java = ""
 368         out_c = ""
 369         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_from_java(" + self.c_fn_args_pfx + ") {\n"
 370         out_c = out_c + "\tswitch ((*env)->CallIntMethod(env, clz, ordinal_meth)) {\n"
 371
 372         out_java_enum = out_java_enum + "public enum " + struct_name + " {\n"
 373         ord_v = 0
 374         for var in variants:
 375             out_java_enum = out_java_enum + "\t" + var + ",\n"
 376             out_c = out_c + "\t\tcase %d: return %s;\n" % (ord_v, var)
 377             ord_v = ord_v + 1
 378         out_java_enum = out_java_enum + "\t; static native void init();\n"
 379         out_java_enum = out_java_enum + "\tstatic { init(); }\n"
 380         out_java_enum = out_java_enum + "}"
 381         out_java = out_java + "\tstatic { " + struct_name + ".values(); /* Force enum statics to run */ }\n"
 382         out_c = out_c + "\t}\n"
 383         out_c = out_c + "\tabort();\n"
 384         out_c = out_c + "}\n"
 385
 386         out_c = out_c + "static jclass " + struct_name + "_class = NULL;\n"
 387         for var in variants:
 388             out_c = out_c + "static jfieldID " + struct_name + "_" + var + " = NULL;\n"
 389         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"
 390         out_c = out_c + "\t" + struct_name + "_class = (*env)->NewGlobalRef(env, clz);\n"
 391         out_c = out_c + "\tCHECK(" + struct_name + "_class != NULL);\n"
 392         for var in variants:
 393             out_c = out_c + "\t" + struct_name + "_" + var + " = (*env)->GetStaticFieldID(env, " + struct_name + "_class, \"" + var + "\", \"Lorg/ldk/enums/" + struct_name + ";\");\n"
 394             out_c = out_c + "\tCHECK(" + struct_name + "_" + var + " != NULL);\n"
 395         out_c = out_c + "}\n"
 396         out_c = out_c + "static inline jclass " + struct_name + "_to_java(JNIEnv *env, " + struct_name + " val) {\n"
 397         out_c = out_c + "\tswitch (val) {\n"
 398         ord_v = 0
 399         for var in variants:
 400             out_c = out_c + "\t\tcase " + var + ":\n"
 401             out_c = out_c + "\t\t\treturn (*env)->GetStaticObjectField(env, " + struct_name + "_class, " + struct_name + "_" + var + ");\n"
 402             ord_v = ord_v + 1
 403         out_c = out_c + "\t\tdefault: abort();\n"
 404         out_c = out_c + "\t}\n"
 405         out_c = out_c + "}\n\n"
 406
 407         return (out_c, out_java_enum, out_java)
 408
 409     def c_unitary_enum_to_native_call(self, ty_info):
 410         return (ty_info.rust_obj + "_to_java(env, ", ")")
 411     def native_unitary_enum_to_c_call(self, ty_info):
 412         return (ty_info.rust_obj + "_from_java(env, ", ")")
 413
 414     def c_complex_enum_pfx(self, struct_name, variants, init_meth_jty_strs):
 415         out_c = ""
 416         for var in variants:
 417             out_c = out_c + "static jclass " + struct_name + "_" + var + "_class = NULL;\n"
 418             out_c = out_c + "static jmethodID " + struct_name + "_" + var + "_meth = NULL;\n"
 419         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"
 420         for var_name in variants:
 421             out_c = out_c + "\t" + struct_name + "_" + var_name + "_class =\n"
 422             out_c = out_c + "\t\t(*env)->NewGlobalRef(env, (*env)->FindClass(env, \"Lorg/ldk/impl/bindings$" + struct_name + "$" + var_name + ";\"));\n"
 423             out_c = out_c + "\tCHECK(" + struct_name + "_" + var_name + "_class != NULL);\n"
 424             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"
 425             out_c = out_c + "\tCHECK(" + struct_name + "_" + var_name + "_meth != NULL);\n"
 426         out_c = out_c + "}\n"
 427         return out_c
 428
 429     def c_complex_enum_pass_ty(self, struct_name):
 430         return "jobject"
 431
 432     def c_constr_native_complex_enum(self, struct_name, variant, c_params):
 433         ret = "(*env)->NewObject(env, " + struct_name + "_" + variant + "_class, " + struct_name + "_" + variant + "_meth"
 434         for param in c_params:
 435             ret = ret + ", " + param
 436         return ret + ")"
 437
 438     def native_c_map_trait(self, struct_name, field_vars, field_fns):
 439         out_java_trait = ""
 440         out_java = ""
 441
 442         # First generate most of the Java code, note that we need information about java method argument strings for C
 443         out_java_trait = out_java_trait + self.hu_struct_file_prefix
 444         out_java_trait = out_java_trait + "public class " + struct_name.replace("LDK","") + " extends CommonBase {\n"
 445         out_java_trait = out_java_trait + "\tfinal bindings." + struct_name + " bindings_instance;\n"
 446         out_java_trait = out_java_trait + "\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); bindings_instance = null; }\n"
 447         out_java_trait = out_java_trait + "\tprivate " + struct_name.replace("LDK", "") + "(bindings." + struct_name + " arg"
 448         for var in field_vars:
 449             if isinstance(var, ConvInfo):
 450                 out_java_trait = out_java_trait + ", " + var.java_hu_ty + " " + var.arg_name
 451             else:
 452                 out_java_trait = out_java_trait + ", bindings." + var[0] + " " + var[1]
 453         out_java_trait = out_java_trait + ") {\n"
 454         out_java_trait = out_java_trait + "\t\tsuper(bindings." + struct_name + "_new(arg"
 455         for var in field_vars:
 456             if isinstance(var, ConvInfo):
 457                 if var.from_hu_conv is not None:
 458                     out_java_trait = out_java_trait + ", " + var.from_hu_conv[0]
 459                 else:
 460                     out_java_trait = out_java_trait + ", " + var.arg_name
 461             else:
 462                 out_java_trait = out_java_trait + ", " + var[1]
 463         out_java_trait = out_java_trait + "));\n"
 464         out_java_trait = out_java_trait + "\t\tthis.ptrs_to.add(arg);\n"
 465         for var in field_vars:
 466             if isinstance(var, ConvInfo):
 467                 if var.from_hu_conv is not None and var.from_hu_conv[1] != "":
 468                     out_java_trait = out_java_trait + "\t\t" + var.from_hu_conv[1] + ";\n"
 469             else:
 470                 out_java_trait = out_java_trait + "\t\tthis.ptrs_to.add(" + var[1] + ");\n"
 471         out_java_trait = out_java_trait + "\t\tthis.bindings_instance = arg;\n"
 472         out_java_trait = out_java_trait + "\t}\n"
 473         out_java_trait = out_java_trait + "\t@Override @SuppressWarnings(\"deprecation\")\n"
 474         out_java_trait = out_java_trait + "\tprotected void finalize() throws Throwable {\n"
 475         out_java_trait = out_java_trait + "\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); } super.finalize();\n"
 476         out_java_trait = out_java_trait + "\t}\n\n"
 477
 478         java_trait_constr = "\tprivate static class " + struct_name + "Holder { " + struct_name.replace("LDK", "") + " held; }\n"
 479         java_trait_constr = java_trait_constr + "\tpublic static " + struct_name.replace("LDK", "") + " new_impl(" + struct_name.replace("LDK", "") + "Interface arg"
 480         for var in field_vars:
 481             if isinstance(var, ConvInfo):
 482                 java_trait_constr = java_trait_constr + ", " + var.java_hu_ty + " " + var.arg_name
 483             else:
 484                 # Ideally we'd be able to take any instance of the interface, but our C code can only represent
 485                 # Java-implemented version, so we require users pass a Java implementation here :/
 486                 java_trait_constr = java_trait_constr + ", " + var[0].replace("LDK", "") + "." + var[0].replace("LDK", "") + "Interface " + var[1] + "_impl"
 487         java_trait_constr = java_trait_constr + ") {\n\t\tfinal " + struct_name + "Holder impl_holder = new " + struct_name + "Holder();\n"
 488         java_trait_constr = java_trait_constr + "\t\timpl_holder.held = new " + struct_name.replace("LDK", "") + "(new bindings." + struct_name + "() {\n"
 489         out_java_trait = out_java_trait + "\tpublic static interface " + struct_name.replace("LDK", "") + "Interface {\n"
 490         out_java = out_java + "\tpublic interface " + struct_name + " {\n"
 491         java_meths = []
 492         for fn_line in field_fns:
 493             java_meth_descr = "("
 494             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 495                 out_java = out_java + "\t\t " + fn_line.ret_ty_info.java_ty + " " + fn_line.fn_name + "("
 496                 java_trait_constr = java_trait_constr + "\t\t\t@Override public " + fn_line.ret_ty_info.java_ty + " " + fn_line.fn_name + "("
 497                 out_java_trait = out_java_trait + "\t\t" + fn_line.ret_ty_info.java_hu_ty + " " + fn_line.fn_name + "("
 498
 499                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 500                     if idx >= 1:
 501                         out_java = out_java + ", "
 502                         java_trait_constr = java_trait_constr + ", "
 503                         out_java_trait = out_java_trait + ", "
 504                     out_java = out_java + arg_conv_info.java_ty + " " + arg_conv_info.arg_name
 505                     out_java_trait = out_java_trait + arg_conv_info.java_hu_ty + " " + arg_conv_info.arg_name
 506                     java_trait_constr = java_trait_constr + arg_conv_info.java_ty + " " + arg_conv_info.arg_name
 507                     java_meth_descr = java_meth_descr + arg_conv_info.java_fn_ty_arg
 508                 java_meth_descr = java_meth_descr + ")" + fn_line.ret_ty_info.java_fn_ty_arg
 509                 java_meths.append((fn_line.fn_name, java_meth_descr))
 510
 511                 out_java = out_java + ");\n"
 512                 out_java_trait = out_java_trait + ");\n"
 513                 java_trait_constr = java_trait_constr + ") {\n"
 514
 515                 for arg_info in fn_line.args_ty:
 516                     if arg_info.to_hu_conv is not None:
 517                         java_trait_constr = java_trait_constr + "\t\t\t\t" + arg_info.to_hu_conv.replace("\n", "\n\t\t\t\t") + "\n"
 518
 519                 if fn_line.ret_ty_info.java_ty != "void":
 520                     java_trait_constr = java_trait_constr + "\t\t\t\t" + fn_line.ret_ty_info.java_hu_ty + " ret = arg." + fn_line.fn_name + "("
 521                 else:
 522                     java_trait_constr = java_trait_constr + "\t\t\t\targ." + fn_line.fn_name + "("
 523
 524                 for idx, arg_info in enumerate(fn_line.args_ty):
 525                     if idx != 0:
 526                         java_trait_constr = java_trait_constr + ", "
 527                     if arg_info.to_hu_conv_name is not None:
 528                         java_trait_constr = java_trait_constr + arg_info.to_hu_conv_name
 529                     else:
 530                         java_trait_constr = java_trait_constr + arg_info.arg_name
 531
 532                 java_trait_constr = java_trait_constr + ");\n"
 533                 if fn_line.ret_ty_info.java_ty != "void":
 534                     if fn_line.ret_ty_info.from_hu_conv is not None:
 535                         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"
 536                         if fn_line.ret_ty_info.from_hu_conv[1] != "":
 537                             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"
 538                         #if fn_line.ret_ty_info.rust_obj in result_types:
 539                         # XXX: We need to handle this in conversion logic so that its cross-language!
 540                             # Avoid double-free by breaking the result - we should learn to clone these and then we can be safe instead
 541                         #    java_trait_constr = java_trait_constr + "\t\t\t\tret.ptr = 0;\n"
 542                         java_trait_constr = java_trait_constr + "\t\t\t\treturn result;\n"
 543                     else:
 544                         java_trait_constr = java_trait_constr + "\t\t\t\treturn ret;\n"
 545                 java_trait_constr = java_trait_constr + "\t\t\t}\n"
 546         java_trait_constr = java_trait_constr + "\t\t}"
 547         for var in field_vars:
 548             if isinstance(var, ConvInfo):
 549                 java_trait_constr = java_trait_constr + ", " + var.arg_name
 550             else:
 551                 java_trait_constr = java_trait_constr + ", " + var[1] + ".new_impl(" + var[1] + "_impl).bindings_instance"
 552         out_java_trait = out_java_trait + "\t}\n"
 553         out_java_trait = out_java_trait + java_trait_constr + ");\n\t\treturn impl_holder.held;\n\t}\n"
 554
 555         out_java = out_java + "\t}\n"
 556
 557         out_java = out_java + "\tpublic static native long " + struct_name + "_new(" + struct_name + " impl"
 558         for var in field_vars:
 559             if isinstance(var, ConvInfo):
 560                 out_java = out_java + ", " + var.java_ty + " " + var.arg_name
 561             else:
 562                 out_java = out_java + ", " + var[0] + " " + var[1]
 563         out_java = out_java + ");\n"
 564
 565         # Now that we've written out our java code (and created java_meths), generate C
 566         out_c = "typedef struct " + struct_name + "_JCalls {\n"
 567         out_c = out_c + "\tatomic_size_t refcnt;\n"
 568         out_c = out_c + "\tJavaVM *vm;\n"
 569         out_c = out_c + "\tjweak o;\n"
 570         for var in field_vars:
 571             if isinstance(var, ConvInfo):
 572                 # We're a regular ol' field
 573                 pass
 574             else:
 575                 # We're a supertrait
 576                 out_c = out_c + "\t" + var[0] + "_JCalls* " + var[1] + ";\n"
 577         for fn in field_fns:
 578             if fn.fn_name != "free" and fn.fn_name != "clone":
 579                 out_c = out_c + "\tjmethodID " + fn.fn_name + "_meth;\n"
 580         out_c = out_c + "} " + struct_name + "_JCalls;\n"
 581
 582         for fn_line in field_fns:
 583             if fn_line.fn_name == "free":
 584                 out_c = out_c + "static void " + struct_name + "_JCalls_free(void* this_arg) {\n"
 585                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 586                 out_c = out_c + "\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n"
 587                 out_c = out_c + "\t\tJNIEnv *env;\n"
 588                 out_c = out_c + "\t\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_8) == JNI_OK);\n"
 589                 out_c = out_c + "\t\t(*env)->DeleteWeakGlobalRef(env, j_calls->o);\n"
 590                 out_c = out_c + "\t\tFREE(j_calls);\n"
 591                 out_c = out_c + "\t}\n}\n"
 592
 593         for idx, fn_line in enumerate(field_fns):
 594             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 595                 assert fn_line.ret_ty_info.ty_info.get_full_rust_ty()[1] == ""
 596                 out_c = out_c + fn_line.ret_ty_info.ty_info.get_full_rust_ty()[0] + " " + fn_line.fn_name + "_jcall("
 597                 if fn_line.self_is_const:
 598                     out_c = out_c + "const void* this_arg"
 599                 else:
 600                     out_c = out_c + "void* this_arg"
 601
 602                 for idx, arg in enumerate(fn_line.args_ty):
 603                     out_c = out_c + ", " + arg.ty_info.get_full_rust_ty()[0] + " " + arg.arg_name + arg.ty_info.get_full_rust_ty()[1]
 604
 605                 out_c = out_c + ") {\n"
 606                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 607                 out_c = out_c + "\tJNIEnv *env;\n"
 608                 out_c = out_c + "\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_8) == JNI_OK);\n"
 609
 610                 for arg_info in fn_line.args_ty:
 611                     if arg_info.ret_conv is not None:
 612                         out_c = out_c + "\t" + arg_info.ret_conv[0].replace('\n', '\n\t')
 613                         out_c = out_c + arg_info.arg_name
 614                         out_c = out_c + arg_info.ret_conv[1].replace('\n', '\n\t') + "\n"
 615
 616                 out_c = out_c + "\tjobject obj = (*env)->NewLocalRef(env, j_calls->o);\n\tCHECK(obj != NULL);\n"
 617                 if fn_line.ret_ty_info.c_ty.endswith("Array"):
 618                     out_c = out_c + "\t" + fn_line.ret_ty_info.c_ty + " arg = (*env)->CallObjectMethod(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 619                 elif not fn_line.ret_ty_info.passed_as_ptr:
 620                     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"
 621                 else:
 622                     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"
 623
 624                 for idx, arg_info in enumerate(fn_line.args_ty):
 625                     if arg_info.ret_conv is not None:
 626                         out_c = out_c + ", " + arg_info.ret_conv_name
 627                     else:
 628                         out_c = out_c + ", " + arg_info.arg_name
 629                 out_c = out_c + ");\n"
 630                 if fn_line.ret_ty_info.arg_conv is not None:
 631                     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"
 632
 633                 out_c = out_c + "}\n"
 634
 635         # Write out a clone function whether we need one or not, as we use them in moving to rust
 636         out_c = out_c + "static void* " + struct_name + "_JCalls_clone(const void* this_arg) {\n"
 637         out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 638         out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n"
 639         for var in field_vars:
 640             if not isinstance(var, ConvInfo):
 641                 out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->" + var[1] + "->refcnt, 1, memory_order_release);\n"
 642         out_c = out_c + "\treturn (void*) this_arg;\n"
 643         out_c = out_c + "}\n"
 644
 645         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_init (" + self.c_fn_args_pfx + ", jobject o"
 646         for var in field_vars:
 647             if isinstance(var, ConvInfo):
 648                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 649             else:
 650                 out_c = out_c + ", jobject " + var[1]
 651         out_c = out_c + ") {\n"
 652
 653         out_c = out_c + "\tjclass c = (*env)->GetObjectClass(env, o);\n"
 654         out_c = out_c + "\tCHECK(c != NULL);\n"
 655         out_c = out_c + "\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n"
 656         out_c = out_c + "\tatomic_init(&calls->refcnt, 1);\n"
 657         out_c = out_c + "\tDO_ASSERT((*env)->GetJavaVM(env, &calls->vm) == 0);\n"
 658         out_c = out_c + "\tcalls->o = (*env)->NewWeakGlobalRef(env, o);\n"
 659
 660         for (fn_name, java_meth_descr) in java_meths:
 661             if fn_name != "free" and fn_name != "clone":
 662                 out_c = out_c + "\tcalls->" + fn_name + "_meth = (*env)->GetMethodID(env, c, \"" + fn_name + "\", \"" + java_meth_descr + "\");\n"
 663                 out_c = out_c + "\tCHECK(calls->" + fn_name + "_meth != NULL);\n"
 664
 665         for var in field_vars:
 666             if isinstance(var, ConvInfo) and var.arg_conv is not None:
 667                 out_c = out_c + "\n\t" + var.arg_conv.replace("\n", "\n\t") +"\n"
 668         out_c = out_c + "\n\t" + struct_name + " ret = {\n"
 669         out_c = out_c + "\t\t.this_arg = (void*) calls,\n"
 670         for fn_line in field_fns:
 671             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 672                 out_c = out_c + "\t\t." + fn_line.fn_name + " = " + fn_line.fn_name + "_jcall,\n"
 673             elif fn_line.fn_name == "free":
 674                 out_c = out_c + "\t\t.free = " + struct_name + "_JCalls_free,\n"
 675             else:
 676                 out_c = out_c + "\t\t.clone = " + struct_name + "_JCalls_clone,\n"
 677         for var in field_vars:
 678             if isinstance(var, ConvInfo):
 679                 if var.arg_conv_name is not None:
 680                     out_c = out_c + "\t\t." + var.arg_name + " = " + var.arg_conv_name + ",\n"
 681                     out_c = out_c + "\t\t.set_" + var.arg_name + " = NULL,\n"
 682                 else:
 683                     out_c = out_c + "\t\t." + var.var_name + " = " + var.var_name + ",\n"
 684                     out_c = out_c + "\t\t.set_" + var.var_name + " = NULL,\n"
 685             else:
 686                 out_c = out_c + "\t\t." + var[1] + " = " + var[0] + "_init(env, clz, " + var[1] + "),\n"
 687         out_c = out_c + "\t};\n"
 688         for var in field_vars:
 689             if not isinstance(var, ConvInfo):
 690                 out_c = out_c + "\tcalls->" + var[1] + " = ret." + var[1] + ".this_arg;\n"
 691         out_c = out_c + "\treturn ret;\n"
 692         out_c = out_c + "}\n"
 693
 694         out_c = out_c + self.c_fn_ty_pfx + "long " + self.c_fn_name_pfx + struct_name.replace("_", "_1") + "_1new (" + self.c_fn_args_pfx + ", jobject o"
 695         for var in field_vars:
 696             if isinstance(var, ConvInfo):
 697                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 698             else:
 699                 out_c = out_c + ", jobject " + var[1]
 700         out_c = out_c + ") {\n"
 701         out_c = out_c + "\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n"
 702         out_c = out_c + "\t*res_ptr = " + struct_name + "_init(env, clz, o"
 703         for var in field_vars:
 704             if isinstance(var, ConvInfo):
 705                 out_c = out_c + ", " + var.arg_name
 706             else:
 707                 out_c = out_c + ", " + var[1]
 708         out_c = out_c + ");\n"
 709         out_c = out_c + "\treturn (long)res_ptr;\n"
 710         out_c = out_c + "}\n"
 711
 712         return (out_java, out_java_trait, out_c)
 713
 714     def trait_struct_inc_refcnt(self, ty_info):
 715         base_conv = "\nif (" + ty_info.var_name + "_conv.free == " + ty_info.rust_obj + "_JCalls_free) {\n"
 716         base_conv = base_conv + "\t// If this_arg is a JCalls struct, then we need to increment the refcnt in it.\n"
 717         base_conv = base_conv + "\t" + ty_info.rust_obj + "_JCalls_clone(" + ty_info.var_name + "_conv.this_arg);\n}"
 718         return base_conv
 719
 720     def map_complex_enum(self, struct_name, variant_list, camel_to_snake):
 721         java_hu_type = struct_name.replace("LDK", "")
 722         out_java_enum = ""
 723         out_java = ""
 724         out_c = ""
 725
 726         out_java_enum += (self.hu_struct_file_prefix)
 727         out_java_enum += ("public class " + java_hu_type + " extends CommonBase {\n")
 728         out_java_enum += ("\tprivate " + java_hu_type + "(Object _dummy, long ptr) { super(ptr); }\n")
 729         out_java_enum += ("\t@Override @SuppressWarnings(\"deprecation\")\n")
 730         out_java_enum += ("\tprotected void finalize() throws Throwable {\n")
 731         out_java_enum += ("\t\tsuper.finalize();\n")
 732         out_java_enum += ("\t\tif (ptr != 0) { bindings." + java_hu_type + "_free(ptr); }\n")
 733         out_java_enum += ("\t}\n")
 734         out_java_enum += ("\tstatic " + java_hu_type + " constr_from_ptr(long ptr) {\n")
 735         out_java_enum += ("\t\tbindings." + struct_name + " raw_val = bindings." + struct_name + "_ref_from_ptr(ptr);\n")
 736         java_hu_subclasses = ""
 737
 738         init_meth_jty_strs = {}
 739
 740         out_java +=  ("\tpublic static class " + struct_name + " {\n")
 741         out_java +=  ("\t\tprivate " + struct_name + "() {}\n")
 742         for var in variant_list:
 743             out_java +=  ("\t\tpublic final static class " + var.var_name + " extends " + struct_name + " {\n")
 744             java_hu_subclasses = java_hu_subclasses + "\tpublic final static class " + var.var_name + " extends " + java_hu_type + " {\n"
 745             out_java_enum += ("\t\tif (raw_val.getClass() == bindings." + struct_name + "." + var.var_name + ".class) {\n")
 746             out_java_enum += ("\t\t\treturn new " + var.var_name + "(ptr, (bindings." + struct_name + "." + var.var_name + ")raw_val);\n")
 747             init_meth_jty_str = ""
 748             init_meth_params = ""
 749             init_meth_body = ""
 750             hu_conv_body = ""
 751             for idx, field_ty in enumerate(var.fields):
 752                 out_java += ("\t\t\tpublic " + field_ty.java_ty + " " + field_ty.arg_name + ";\n")
 753                 java_hu_subclasses = java_hu_subclasses + "\t\tpublic final " + field_ty.java_hu_ty + " " + field_ty.arg_name + ";\n"
 754                 if field_ty.to_hu_conv is not None:
 755                     hu_conv_body = hu_conv_body + "\t\t\t" + field_ty.java_ty + " " + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
 756                     hu_conv_body = hu_conv_body + "\t\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
 757                     hu_conv_body = hu_conv_body + "\t\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
 758                 else:
 759                     hu_conv_body = hu_conv_body + "\t\t\tthis." + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
 760                 init_meth_jty_str = init_meth_jty_str + field_ty.java_fn_ty_arg
 761                 if idx > 0:
 762                     init_meth_params = init_meth_params + ", "
 763                 init_meth_params = init_meth_params + field_ty.java_ty + " " + field_ty.arg_name
 764                 init_meth_body = init_meth_body + "this." + field_ty.arg_name + " = " + field_ty.arg_name + "; "
 765             out_java +=  ("\t\t\t" + var.var_name + "(" + init_meth_params + ") { ")
 766             out_java +=  (init_meth_body)
 767             out_java +=  ("}\n")
 768             out_java += ("\t\t}\n")
 769             out_java_enum += ("\t\t}\n")
 770             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"
 771             java_hu_subclasses = java_hu_subclasses + hu_conv_body
 772             java_hu_subclasses = java_hu_subclasses + "\t\t}\n\t}\n"
 773             init_meth_jty_strs[var.var_name] = init_meth_jty_str
 774         out_java += ("\t\tstatic native void init();\n")
 775         out_java += ("\t}\n")
 776         out_java_enum += ("\t\tassert false; return null; // Unreachable without extending the (internal) bindings interface\n\t}\n\n")
 777         out_java_enum += (java_hu_subclasses)
 778         out_java += ("\tstatic { " + struct_name + ".init(); }\n")
 779         out_java += ("\tpublic static native " + struct_name + " " + struct_name + "_ref_from_ptr(long ptr);\n");
 780
 781         out_c += (self.c_complex_enum_pfx(struct_name, [x.var_name for x in variant_list], init_meth_jty_strs))
 782
 783         out_c += (self.c_fn_ty_pfx + self.c_complex_enum_pass_ty(struct_name) + " " + self.c_fn_name_pfx + struct_name.replace("_", "_1") + "_1ref_1from_1ptr (" + self.c_fn_args_pfx + ", " + self.ptr_c_ty + " ptr) {\n")
 784         out_c += ("\t" + struct_name + " *obj = (" + struct_name + "*)ptr;\n")
 785         out_c += ("\tswitch(obj->tag) {\n")
 786         for var in variant_list:
 787             out_c += ("\t\tcase " + struct_name + "_" + var.var_name + ": {\n")
 788             c_params = []
 789             for idx, field_map in enumerate(var.fields):
 790                 if field_map.ret_conv is not None:
 791                     out_c += ("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
 792                     out_c += ("obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name)
 793                     out_c += (field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
 794                     c_params.append(field_map.ret_conv_name)
 795                 else:
 796                     c_params.append("obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name)
 797             out_c += ("\t\t\treturn " + self.c_constr_native_complex_enum(struct_name, var.var_name, c_params) + ";\n")
 798             out_c += ("\t\t}\n")
 799         out_c += ("\t\tdefault: abort();\n")
 800         out_c += ("\t}\n}\n")
 801         out_java_enum += ("}\n")
 802         return (out_java, out_java_enum, out_c)
 803
 804     def map_opaque_struct(self, struct_name):
 805         out_opaque_struct_human = ""
 806         out_opaque_struct_human += self.hu_struct_file_prefix
 807         out_opaque_struct_human += ("public class " + struct_name.replace("LDK","") + " extends CommonBase")
 808         if struct_name.startswith("LDKLocked"):
 809             out_opaque_struct_human += (" implements AutoCloseable")
 810         out_opaque_struct_human += (" {\n")
 811         out_opaque_struct_human += ("\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); }\n")
 812         if struct_name.startswith("LDKLocked"):
 813             out_opaque_struct_human += ("\t@Override public void close() {\n")
 814         else:
 815             out_opaque_struct_human += ("\t@Override @SuppressWarnings(\"deprecation\")\n")
 816             out_opaque_struct_human += ("\tprotected void finalize() throws Throwable {\n")
 817             out_opaque_struct_human += ("\t\tsuper.finalize();\n")
 818         out_opaque_struct_human += ("\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); }\n")
 819         out_opaque_struct_human += ("\t}\n\n")
 820         return out_opaque_struct_human
 821
 822
 823     def map_function(self, argument_types, c_call_string, is_free, method_name, return_type_info, struct_meth, default_constructor_args, takes_self, args_known, has_out_java_struct: bool, type_mapping_generator):
 824         out_java = ""
 825         out_c = ""
 826         out_java_struct = None
 827
 828         out_java += ("\tpublic static native ")
 829         out_c += (self.c_fn_ty_pfx)
 830         out_c += (return_type_info.c_ty)
 831         out_java += (return_type_info.java_ty)
 832         if return_type_info.ret_conv is not None:
 833             ret_conv_pfx, ret_conv_sfx = return_type_info.ret_conv
 834         out_java += (" " + method_name + "(")
 835         out_c += (" " + self.c_fn_name_pfx + method_name.replace('_', '_1') + "(" + self.c_fn_args_pfx)
 836
 837         for idx, arg_conv_info in enumerate(argument_types):
 838             if idx != 0:
 839                 out_java += (", ")
 840             if arg_conv_info.c_ty != "void":
 841                 out_c += (", ")
 842             if arg_conv_info.c_ty != "void":
 843                 out_c += (arg_conv_info.c_ty + " " + arg_conv_info.arg_name)
 844                 out_java += (arg_conv_info.java_ty + " " + arg_conv_info.arg_name)
 845
 846         if has_out_java_struct:
 847             out_java_struct = ""
 848             if not args_known:
 849                 out_java_struct += ("\t// Skipped " + method_name + "\n")
 850                 has_out_java_struct = False
 851             else:
 852                 meth_n = method_name[len(struct_meth) + 1:]
 853                 if not takes_self:
 854                     out_java_struct += (
 855                         "\tpublic static " + return_type_info.java_hu_ty + " constructor_" + meth_n + "(")
 856                 else:
 857                     out_java_struct += ("\tpublic " + return_type_info.java_hu_ty + " " + meth_n + "(")
 858                 for idx, arg in enumerate(argument_types):
 859                     if idx != 0:
 860                         if not takes_self or idx > 1:
 861                             out_java_struct += (", ")
 862                     elif takes_self:
 863                         continue
 864                     if arg.java_ty != "void":
 865                         if arg.arg_name in default_constructor_args:
 866                             for explode_idx, explode_arg in enumerate(default_constructor_args[arg.arg_name]):
 867                                 if explode_idx != 0:
 868                                     out_java_struct += (", ")
 869                                 out_java_struct += (
 870                                     explode_arg.java_hu_ty + " " + arg.arg_name + "_" + explode_arg.arg_name)
 871                         else:
 872                             out_java_struct += (arg.java_hu_ty + " " + arg.arg_name)
 873         out_java += (");\n")
 874         out_c += (") {\n")
 875         if out_java_struct is not None:
 876             out_java_struct += (") {\n")
 877         for info in argument_types:
 878             if info.arg_conv is not None:
 879                 out_c += ("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
 880         if return_type_info.ret_conv is not None:
 881             out_c += ("\t" + ret_conv_pfx.replace('\n', '\n\t'))
 882         elif return_type_info.c_ty != "void":
 883             out_c += ("\t" + return_type_info.c_ty + " ret_val = ")
 884         else:
 885             out_c += ("\t")
 886         if c_call_string is None:
 887             out_c += (method_name + "(")
 888         else:
 889             out_c += (c_call_string)
 890         for idx, info in enumerate(argument_types):
 891             if info.arg_conv_name is not None:
 892                 if idx != 0:
 893                     out_c += (", ")
 894                 elif c_call_string is not None:
 895                     continue
 896                 out_c += (info.arg_conv_name)
 897         out_c += (")")
 898         if return_type_info.ret_conv is not None:
 899             out_c += (ret_conv_sfx.replace('\n', '\n\t'))
 900         else:
 901             out_c += (";")
 902         for info in argument_types:
 903             if info.arg_conv_cleanup is not None:
 904                 out_c += ("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
 905         if return_type_info.ret_conv is not None:
 906             out_c += ("\n\treturn " + return_type_info.ret_conv_name + ";")
 907         elif return_type_info.c_ty != "void":
 908             out_c += ("\n\treturn ret_val;")
 909         out_c += ("\n}\n\n")
 910
 911         if has_out_java_struct:
 912             out_java_struct += ("\t\t")
 913             if return_type_info.java_ty != "void":
 914                 out_java_struct += (return_type_info.java_ty + " ret = ")
 915             out_java_struct += ("bindings." + method_name + "(")
 916             for idx, info in enumerate(argument_types):
 917                 if idx != 0:
 918                     out_java_struct += (", ")
 919                 if idx == 0 and takes_self:
 920                     out_java_struct += ("this.ptr")
 921                 elif info.arg_name in default_constructor_args:
 922                     out_java_struct += ("bindings." + info.java_hu_ty + "_new(")
 923                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
 924                         if explode_idx != 0:
 925                             out_java_struct += (", ")
 926                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
 927                         if explode_arg.from_hu_conv is not None:
 928                             out_java_struct += (
 929                                 explode_arg.from_hu_conv[0].replace(explode_arg.arg_name, expl_arg_name))
 930                         else:
 931                             out_java_struct += (expl_arg_name)
 932                     out_java_struct += (")")
 933                 elif info.from_hu_conv is not None:
 934                     out_java_struct += (info.from_hu_conv[0])
 935                 else:
 936                     out_java_struct += (info.arg_name)
 937             out_java_struct += (");\n")
 938             if return_type_info.to_hu_conv is not None:
 939                 if not takes_self:
 940                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t").replace("this",
 941                                                                                                                return_type_info.to_hu_conv_name) + "\n")
 942                 else:
 943                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t") + "\n")
 944
 945             for idx, info in enumerate(argument_types):
 946                 if idx == 0 and takes_self:
 947                     pass
 948                 elif info.arg_name in default_constructor_args:
 949                     for explode_arg in default_constructor_args[info.arg_name]:
 950                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
 951                         if explode_arg.from_hu_conv is not None and return_type_info.to_hu_conv_name:
 952                             out_java_struct += ("\t\t" + explode_arg.from_hu_conv[1].replace(explode_arg.arg_name,
 953                                                                                                expl_arg_name).replace(
 954                                 "this", return_type_info.to_hu_conv_name) + ";\n")
 955                 elif info.from_hu_conv is not None and info.from_hu_conv[1] != "":
 956                     if not takes_self and return_type_info.to_hu_conv_name is not None:
 957                         out_java_struct += (
 958                             "\t\t" + info.from_hu_conv[1].replace("this", return_type_info.to_hu_conv_name) + ";\n")
 959                     else:
 960                         out_java_struct += ("\t\t" + info.from_hu_conv[1] + ";\n")
 961
 962             if return_type_info.to_hu_conv_name is not None:
 963                 out_java_struct += ("\t\treturn " + return_type_info.to_hu_conv_name + ";\n")
 964             elif return_type_info.java_ty != "void" and return_type_info.rust_obj != "LDK" + struct_meth:
 965                 out_java_struct += ("\t\treturn ret;\n")
 966             out_java_struct += ("\t}\n\n")
 967
 968         return (out_java, out_c, out_java_struct)