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

   1 from bindingstypes import *
   2
   3 class Consts:
   4     def __init__(self, DEBUG: bool, **kwargs):
   5
   6         self.c_type_map = dict(
   7             uint8_t = ['byte'],
   8             uint16_t = ['short'],
   9             uint32_t = ['int'],
  10             long = ['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.ptr_arr = "jobjectArray"
 303         self.get_native_arr_len_call = ("(*env)->GetArrayLength(env, ", ")")
 304         self.get_native_arr_ptr_call = ("(*env)->GetPrimitiveArrayCritical(env, ", ", NULL)")
 305
 306     def release_native_arr_ptr_call(self, arr_var, arr_ptr_var):
 307         return "(*env)->ReleasePrimitiveArrayCritical(env, " + arr_var + ", " + arr_ptr_var + ", 0)"
 308     def create_native_arr_call(self, arr_len, ty_info):
 309         if ty_info.c_ty == "int8_tArray":
 310             return "(*env)->NewByteArray(env, " + arr_len + ")"
 311         else:
 312             return "(*env)->New" + ty_info.java_ty.strip("[]").title() + "Array(env, " + arr_len + ")"
 313     def set_native_arr_contents(self, arr_name, arr_len, ty_info):
 314         if ty_info.c_ty == "int8_tArray":
 315             return ("(*env)->SetByteArrayRegion(env, " + arr_name + ", 0, " + arr_len + ", ", ")")
 316         else:
 317             assert False
 318     def get_native_arr_contents(self, arr_name, dest_name, arr_len, ty_info, copy):
 319         if ty_info.c_ty == "int8_tArray":
 320             if copy:
 321                 return "(*env)->GetByteArrayRegion(env, " + arr_name + ", 0, " + arr_len + ", " + dest_name + ")"
 322             else:
 323                 return "(*env)->GetByteArrayElements (env, " + arr_name + ", NULL)"
 324         elif not ty_info.java_ty[:len(ty_info.java_ty) - 2].endswith("[]"):
 325             return "(*env)->Get" + ty_info.subty.java_ty.title() + "ArrayElements (env, " + arr_name + ", NULL)"
 326         else:
 327             return None
 328     def get_native_arr_elem(self, arr_name, idxc, ty_info):
 329         if self.get_native_arr_contents(arr_name, "", "", ty_info, False) is None:
 330             return "(*env)->GetObjectArrayElement(env, " + arr_name + ", " + idxc + ")"
 331         else:
 332             assert False # Only called if above is None
 333     def cleanup_native_arr_ref_contents(self, arr_name, dest_name, arr_len, ty_info):
 334         if ty_info.c_ty == "int8_tArray":
 335             return "(*env)->ReleaseByteArrayElements(env, " + arr_name + ", (int8_t*)" + dest_name + ", 0);"
 336         else:
 337             return "(*env)->Release" + ty_info.java_ty.strip("[]").title() + "ArrayElements(env, " + arr_name + ", " + dest_name + ", 0)"
 338
 339     def init_str(self, c_array_class_caches):
 340         res = ""
 341         for ty in c_array_class_caches:
 342             res = res + "static jclass " + ty + "_clz = NULL;\n"
 343         res = res + "JNIEXPORT void Java_org_ldk_impl_bindings_init_1class_1cache(JNIEnv * env, jclass clz) {\n"
 344         for ty in c_array_class_caches:
 345             res = res + "\t" + ty + "_clz = (*env)->FindClass(env, \"" + ty.replace("arr_of_", "[") + "\");\n"
 346             res = res + "\tCHECK(" + ty + "_clz != NULL);\n"
 347             res = res + "\t" + ty + "_clz = (*env)->NewGlobalRef(env, " + ty + "_clz);\n"
 348         res = res + "}\n"
 349         return res
 350
 351     def native_c_unitary_enum_map(self, struct_name, variants):
 352         out_java_enum = "package org.ldk.enums;\n\n"
 353         out_java = ""
 354         out_c = ""
 355         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_from_java(" + self.c_fn_args_pfx + ") {\n"
 356         out_c = out_c + "\tswitch ((*env)->CallIntMethod(env, clz, ordinal_meth)) {\n"
 357
 358         out_java_enum = out_java_enum + "public enum " + struct_name + " {\n"
 359         ord_v = 0
 360         for var in variants:
 361             out_java_enum = out_java_enum + "\t" + var + ",\n"
 362             out_c = out_c + "\t\tcase %d: return %s;\n" % (ord_v, var)
 363             ord_v = ord_v + 1
 364         out_java_enum = out_java_enum + "\t; static native void init();\n"
 365         out_java_enum = out_java_enum + "\tstatic { init(); }\n"
 366         out_java_enum = out_java_enum + "}"
 367         out_java = out_java + "\tstatic { " + struct_name + ".values(); /* Force enum statics to run */ }\n"
 368         out_c = out_c + "\t}\n"
 369         out_c = out_c + "\tabort();\n"
 370         out_c = out_c + "}\n"
 371
 372         out_c = out_c + "static jclass " + struct_name + "_class = NULL;\n"
 373         for var in variants:
 374             out_c = out_c + "static jfieldID " + struct_name + "_" + var + " = NULL;\n"
 375         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"
 376         out_c = out_c + "\t" + struct_name + "_class = (*env)->NewGlobalRef(env, clz);\n"
 377         out_c = out_c + "\tCHECK(" + struct_name + "_class != NULL);\n"
 378         for var in variants:
 379             out_c = out_c + "\t" + struct_name + "_" + var + " = (*env)->GetStaticFieldID(env, " + struct_name + "_class, \"" + var + "\", \"Lorg/ldk/enums/" + struct_name + ";\");\n"
 380             out_c = out_c + "\tCHECK(" + struct_name + "_" + var + " != NULL);\n"
 381         out_c = out_c + "}\n"
 382         out_c = out_c + "static inline jclass " + struct_name + "_to_java(JNIEnv *env, " + struct_name + " val) {\n"
 383         out_c = out_c + "\tswitch (val) {\n"
 384         ord_v = 0
 385         for var in variants:
 386             out_c = out_c + "\t\tcase " + var + ":\n"
 387             out_c = out_c + "\t\t\treturn (*env)->GetStaticObjectField(env, " + struct_name + "_class, " + struct_name + "_" + var + ");\n"
 388             ord_v = ord_v + 1
 389         out_c = out_c + "\t\tdefault: abort();\n"
 390         out_c = out_c + "\t}\n"
 391         out_c = out_c + "}\n\n"
 392
 393         return (out_c, out_java_enum, out_java)
 394
 395     def c_unitary_enum_to_native_call(self, ty_info):
 396         return (ty_info.rust_obj + "_to_java(env, ", ")")
 397     def native_unitary_enum_to_c_call(self, ty_info):
 398         return (ty_info.rust_obj + "_from_java(env, ", ")")
 399
 400     def c_complex_enum_pfx(self, struct_name, variants, init_meth_jty_strs):
 401         out_c = ""
 402         for var in variants:
 403             out_c = out_c + "static jclass " + struct_name + "_" + var + "_class = NULL;\n"
 404             out_c = out_c + "static jmethodID " + struct_name + "_" + var + "_meth = NULL;\n"
 405         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"
 406         for var_name in variants:
 407             out_c = out_c + "\t" + struct_name + "_" + var_name + "_class =\n"
 408             out_c = out_c + "\t\t(*env)->NewGlobalRef(env, (*env)->FindClass(env, \"Lorg/ldk/impl/bindings$" + struct_name + "$" + var_name + ";\"));\n"
 409             out_c = out_c + "\tCHECK(" + struct_name + "_" + var_name + "_class != NULL);\n"
 410             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"
 411             out_c = out_c + "\tCHECK(" + struct_name + "_" + var_name + "_meth != NULL);\n"
 412         out_c = out_c + "}\n"
 413         return out_c
 414
 415     def c_complex_enum_pass_ty(self, struct_name):
 416         return "jobject"
 417
 418     def c_constr_native_complex_enum(self, struct_name, variant, c_params):
 419         ret = "(*env)->NewObject(env, " + struct_name + "_" + variant + "_class, " + struct_name + "_" + variant + "_meth"
 420         for param in c_params:
 421             ret = ret + ", " + param
 422         return ret + ")"
 423
 424     def native_c_map_trait(self, struct_name, field_vars, field_fns):
 425         out_java_trait = ""
 426         out_java = ""
 427
 428         # First generate most of the Java code, note that we need information about java method argument strings for C
 429         out_java_trait = out_java_trait + self.hu_struct_file_prefix
 430         out_java_trait = out_java_trait + "public class " + struct_name.replace("LDK","") + " extends CommonBase {\n"
 431         out_java_trait = out_java_trait + "\tfinal bindings." + struct_name + " bindings_instance;\n"
 432         out_java_trait = out_java_trait + "\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); bindings_instance = null; }\n"
 433         out_java_trait = out_java_trait + "\tprivate " + struct_name.replace("LDK", "") + "(bindings." + struct_name + " arg"
 434         for var in field_vars:
 435             if isinstance(var, ConvInfo):
 436                 out_java_trait = out_java_trait + ", " + var.java_hu_ty + " " + var.arg_name
 437             else:
 438                 out_java_trait = out_java_trait + ", bindings." + var[0] + " " + var[1]
 439         out_java_trait = out_java_trait + ") {\n"
 440         out_java_trait = out_java_trait + "\t\tsuper(bindings." + struct_name + "_new(arg"
 441         for var in field_vars:
 442             if isinstance(var, ConvInfo):
 443                 if var.from_hu_conv is not None:
 444                     out_java_trait = out_java_trait + ", " + var.from_hu_conv[0]
 445                 else:
 446                     out_java_trait = out_java_trait + ", " + var.arg_name
 447             else:
 448                 out_java_trait = out_java_trait + ", " + var[1]
 449         out_java_trait = out_java_trait + "));\n"
 450         out_java_trait = out_java_trait + "\t\tthis.ptrs_to.add(arg);\n"
 451         for var in field_vars:
 452             if isinstance(var, ConvInfo):
 453                 if var.from_hu_conv is not None and var.from_hu_conv[1] != "":
 454                     out_java_trait = out_java_trait + "\t\t" + var.from_hu_conv[1] + ";\n"
 455             else:
 456                 out_java_trait = out_java_trait + "\t\tthis.ptrs_to.add(" + var[1] + ");\n"
 457         out_java_trait = out_java_trait + "\t\tthis.bindings_instance = arg;\n"
 458         out_java_trait = out_java_trait + "\t}\n"
 459         out_java_trait = out_java_trait + "\t@Override @SuppressWarnings(\"deprecation\")\n"
 460         out_java_trait = out_java_trait + "\tprotected void finalize() throws Throwable {\n"
 461         out_java_trait = out_java_trait + "\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); } super.finalize();\n"
 462         out_java_trait = out_java_trait + "\t}\n\n"
 463
 464         java_trait_constr = "\tprivate static class " + struct_name + "Holder { " + struct_name.replace("LDK", "") + " held; }\n"
 465         java_trait_constr = java_trait_constr + "\tpublic static " + struct_name.replace("LDK", "") + " new_impl(" + struct_name.replace("LDK", "") + "Interface arg"
 466         for var in field_vars:
 467             if isinstance(var, ConvInfo):
 468                 java_trait_constr = java_trait_constr + ", " + var.java_hu_ty + " " + var.arg_name
 469             else:
 470                 # Ideally we'd be able to take any instance of the interface, but our C code can only represent
 471                 # Java-implemented version, so we require users pass a Java implementation here :/
 472                 java_trait_constr = java_trait_constr + ", " + var[0].replace("LDK", "") + "." + var[0].replace("LDK", "") + "Interface " + var[1] + "_impl"
 473         java_trait_constr = java_trait_constr + ") {\n\t\tfinal " + struct_name + "Holder impl_holder = new " + struct_name + "Holder();\n"
 474         java_trait_constr = java_trait_constr + "\t\timpl_holder.held = new " + struct_name.replace("LDK", "") + "(new bindings." + struct_name + "() {\n"
 475         out_java_trait = out_java_trait + "\tpublic static interface " + struct_name.replace("LDK", "") + "Interface {\n"
 476         out_java = out_java + "\tpublic interface " + struct_name + " {\n"
 477         java_meths = []
 478         for fn_line in field_fns:
 479             java_meth_descr = "("
 480             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 481                 out_java = out_java + "\t\t " + fn_line.ret_ty_info.java_ty + " " + fn_line.fn_name + "("
 482                 java_trait_constr = java_trait_constr + "\t\t\t@Override public " + fn_line.ret_ty_info.java_ty + " " + fn_line.fn_name + "("
 483                 out_java_trait = out_java_trait + "\t\t" + fn_line.ret_ty_info.java_hu_ty + " " + fn_line.fn_name + "("
 484
 485                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 486                     if idx >= 1:
 487                         out_java = out_java + ", "
 488                         java_trait_constr = java_trait_constr + ", "
 489                         out_java_trait = out_java_trait + ", "
 490                     out_java = out_java + arg_conv_info.java_ty + " " + arg_conv_info.arg_name
 491                     out_java_trait = out_java_trait + arg_conv_info.java_hu_ty + " " + arg_conv_info.arg_name
 492                     java_trait_constr = java_trait_constr + arg_conv_info.java_ty + " " + arg_conv_info.arg_name
 493                     java_meth_descr = java_meth_descr + arg_conv_info.java_fn_ty_arg
 494                 java_meth_descr = java_meth_descr + ")" + fn_line.ret_ty_info.java_fn_ty_arg
 495                 java_meths.append((fn_line.fn_name, java_meth_descr))
 496
 497                 out_java = out_java + ");\n"
 498                 out_java_trait = out_java_trait + ");\n"
 499                 java_trait_constr = java_trait_constr + ") {\n"
 500
 501                 for arg_info in fn_line.args_ty:
 502                     if arg_info.to_hu_conv is not None:
 503                         java_trait_constr = java_trait_constr + "\t\t\t\t" + arg_info.to_hu_conv.replace("\n", "\n\t\t\t\t") + "\n"
 504
 505                 if fn_line.ret_ty_info.java_ty != "void":
 506                     java_trait_constr = java_trait_constr + "\t\t\t\t" + fn_line.ret_ty_info.java_hu_ty + " ret = arg." + fn_line.fn_name + "("
 507                 else:
 508                     java_trait_constr = java_trait_constr + "\t\t\t\targ." + fn_line.fn_name + "("
 509
 510                 for idx, arg_info in enumerate(fn_line.args_ty):
 511                     if idx != 0:
 512                         java_trait_constr = java_trait_constr + ", "
 513                     if arg_info.to_hu_conv_name is not None:
 514                         java_trait_constr = java_trait_constr + arg_info.to_hu_conv_name
 515                     else:
 516                         java_trait_constr = java_trait_constr + arg_info.arg_name
 517
 518                 java_trait_constr = java_trait_constr + ");\n"
 519                 if fn_line.ret_ty_info.java_ty != "void":
 520                     if fn_line.ret_ty_info.from_hu_conv is not None:
 521                         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"
 522                         if fn_line.ret_ty_info.from_hu_conv[1] != "":
 523                             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"
 524                         #if fn_line.ret_ty_info.rust_obj in result_types:
 525                         # XXX: We need to handle this in conversion logic so that its cross-language!
 526                             # Avoid double-free by breaking the result - we should learn to clone these and then we can be safe instead
 527                         #    java_trait_constr = java_trait_constr + "\t\t\t\tret.ptr = 0;\n"
 528                         java_trait_constr = java_trait_constr + "\t\t\t\treturn result;\n"
 529                     else:
 530                         java_trait_constr = java_trait_constr + "\t\t\t\treturn ret;\n"
 531                 java_trait_constr = java_trait_constr + "\t\t\t}\n"
 532         java_trait_constr = java_trait_constr + "\t\t}"
 533         for var in field_vars:
 534             if isinstance(var, ConvInfo):
 535                 java_trait_constr = java_trait_constr + ", " + var.arg_name
 536             else:
 537                 java_trait_constr = java_trait_constr + ", " + var[1] + ".new_impl(" + var[1] + "_impl).bindings_instance"
 538         out_java_trait = out_java_trait + "\t}\n"
 539         out_java_trait = out_java_trait + java_trait_constr + ");\n\t\treturn impl_holder.held;\n\t}\n"
 540
 541         out_java = out_java + "\t}\n"
 542
 543         out_java = out_java + "\tpublic static native long " + struct_name + "_new(" + struct_name + " impl"
 544         for var in field_vars:
 545             if isinstance(var, ConvInfo):
 546                 out_java = out_java + ", " + var.java_ty + " " + var.arg_name
 547             else:
 548                 out_java = out_java + ", " + var[0] + " " + var[1]
 549         out_java = out_java + ");\n"
 550         out_java = out_java + "\tpublic static native " + struct_name + " " + struct_name + "_get_obj_from_jcalls(long val);\n"
 551
 552         # Now that we've written out our java code (and created java_meths), generate C
 553         out_c = "typedef struct " + struct_name + "_JCalls {\n"
 554         out_c = out_c + "\tatomic_size_t refcnt;\n"
 555         out_c = out_c + "\tJavaVM *vm;\n"
 556         out_c = out_c + "\tjweak o;\n"
 557         for var in field_vars:
 558             if isinstance(var, ConvInfo):
 559                 # We're a regular ol' field
 560                 pass
 561             else:
 562                 # We're a supertrait
 563                 out_c = out_c + "\t" + var[0] + "_JCalls* " + var[1] + ";\n"
 564         for fn in field_fns:
 565             if fn.fn_name != "free" and fn.fn_name != "clone":
 566                 out_c = out_c + "\tjmethodID " + fn.fn_name + "_meth;\n"
 567         out_c = out_c + "} " + struct_name + "_JCalls;\n"
 568
 569         for fn_line in field_fns:
 570             if fn_line.fn_name == "free":
 571                 out_c = out_c + "static void " + struct_name + "_JCalls_free(void* this_arg) {\n"
 572                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 573                 out_c = out_c + "\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n"
 574                 out_c = out_c + "\t\tJNIEnv *env;\n"
 575                 out_c = out_c + "\t\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_8) == JNI_OK);\n"
 576                 out_c = out_c + "\t\t(*env)->DeleteWeakGlobalRef(env, j_calls->o);\n"
 577                 out_c = out_c + "\t\tFREE(j_calls);\n"
 578                 out_c = out_c + "\t}\n}\n"
 579
 580         for idx, fn_line in enumerate(field_fns):
 581             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 582                 assert fn_line.ret_ty_info.ty_info.get_full_rust_ty()[1] == ""
 583                 out_c = out_c + fn_line.ret_ty_info.ty_info.get_full_rust_ty()[0] + " " + fn_line.fn_name + "_jcall("
 584                 if fn_line.self_is_const:
 585                     out_c = out_c + "const void* this_arg"
 586                 else:
 587                     out_c = out_c + "void* this_arg"
 588
 589                 for idx, arg in enumerate(fn_line.args_ty):
 590                     out_c = out_c + ", " + arg.ty_info.get_full_rust_ty()[0] + " " + arg.arg_name + arg.ty_info.get_full_rust_ty()[1]
 591
 592                 out_c = out_c + ") {\n"
 593                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 594                 out_c = out_c + "\tJNIEnv *env;\n"
 595                 out_c = out_c + "\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_8) == JNI_OK);\n"
 596
 597                 for arg_info in fn_line.args_ty:
 598                     if arg_info.ret_conv is not None:
 599                         out_c = out_c + "\t" + arg_info.ret_conv[0].replace('\n', '\n\t')
 600                         out_c = out_c + arg_info.arg_name
 601                         out_c = out_c + arg_info.ret_conv[1].replace('\n', '\n\t') + "\n"
 602
 603                 out_c = out_c + "\tjobject obj = (*env)->NewLocalRef(env, j_calls->o);\n\tCHECK(obj != NULL);\n"
 604                 if fn_line.ret_ty_info.c_ty.endswith("Array"):
 605                     out_c = out_c + "\t" + fn_line.ret_ty_info.c_ty + " arg = (*env)->CallObjectMethod(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 606                 elif not fn_line.ret_ty_info.passed_as_ptr:
 607                     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"
 608                 else:
 609                     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"
 610
 611                 for idx, arg_info in enumerate(fn_line.args_ty):
 612                     if arg_info.ret_conv is not None:
 613                         out_c = out_c + ", " + arg_info.ret_conv_name
 614                     else:
 615                         out_c = out_c + ", " + arg_info.arg_name
 616                 out_c = out_c + ");\n"
 617                 if fn_line.ret_ty_info.arg_conv is not None:
 618                     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"
 619
 620                 out_c = out_c + "}\n"
 621
 622         # Write out a clone function whether we need one or not, as we use them in moving to rust
 623         out_c = out_c + "static void* " + struct_name + "_JCalls_clone(const void* this_arg) {\n"
 624         out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 625         out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n"
 626         for var in field_vars:
 627             if not isinstance(var, ConvInfo):
 628                 out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->" + var[1] + "->refcnt, 1, memory_order_release);\n"
 629         out_c = out_c + "\treturn (void*) this_arg;\n"
 630         out_c = out_c + "}\n"
 631
 632         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_init (" + self.c_fn_args_pfx + ", jobject o"
 633         for var in field_vars:
 634             if isinstance(var, ConvInfo):
 635                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 636             else:
 637                 out_c = out_c + ", jobject " + var[1]
 638         out_c = out_c + ") {\n"
 639
 640         out_c = out_c + "\tjclass c = (*env)->GetObjectClass(env, o);\n"
 641         out_c = out_c + "\tCHECK(c != NULL);\n"
 642         out_c = out_c + "\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n"
 643         out_c = out_c + "\tatomic_init(&calls->refcnt, 1);\n"
 644         out_c = out_c + "\tDO_ASSERT((*env)->GetJavaVM(env, &calls->vm) == 0);\n"
 645         out_c = out_c + "\tcalls->o = (*env)->NewWeakGlobalRef(env, o);\n"
 646
 647         for (fn_name, java_meth_descr) in java_meths:
 648             if fn_name != "free" and fn_name != "clone":
 649                 out_c = out_c + "\tcalls->" + fn_name + "_meth = (*env)->GetMethodID(env, c, \"" + fn_name + "\", \"" + java_meth_descr + "\");\n"
 650                 out_c = out_c + "\tCHECK(calls->" + fn_name + "_meth != NULL);\n"
 651
 652         for var in field_vars:
 653             if isinstance(var, ConvInfo) and var.arg_conv is not None:
 654                 out_c = out_c + "\n\t" + var.arg_conv.replace("\n", "\n\t") +"\n"
 655         out_c = out_c + "\n\t" + struct_name + " ret = {\n"
 656         out_c = out_c + "\t\t.this_arg = (void*) calls,\n"
 657         for fn_line in field_fns:
 658             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 659                 out_c = out_c + "\t\t." + fn_line.fn_name + " = " + fn_line.fn_name + "_jcall,\n"
 660             elif fn_line.fn_name == "free":
 661                 out_c = out_c + "\t\t.free = " + struct_name + "_JCalls_free,\n"
 662             else:
 663                 out_c = out_c + "\t\t.clone = " + struct_name + "_JCalls_clone,\n"
 664         for var in field_vars:
 665             if isinstance(var, ConvInfo):
 666                 if var.arg_conv_name is not None:
 667                     out_c = out_c + "\t\t." + var.arg_name + " = " + var.arg_conv_name + ",\n"
 668                     out_c = out_c + "\t\t.set_" + var.arg_name + " = NULL,\n"
 669                 else:
 670                     out_c = out_c + "\t\t." + var.var_name + " = " + var.var_name + ",\n"
 671                     out_c = out_c + "\t\t.set_" + var.var_name + " = NULL,\n"
 672             else:
 673                 out_c = out_c + "\t\t." + var[1] + " = " + var[0] + "_init(env, clz, " + var[1] + "),\n"
 674         out_c = out_c + "\t};\n"
 675         for var in field_vars:
 676             if not isinstance(var, ConvInfo):
 677                 out_c = out_c + "\tcalls->" + var[1] + " = ret." + var[1] + ".this_arg;\n"
 678         out_c = out_c + "\treturn ret;\n"
 679         out_c = out_c + "}\n"
 680
 681         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"
 682         for var in field_vars:
 683             if isinstance(var, ConvInfo):
 684                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 685             else:
 686                 out_c = out_c + ", jobject " + var[1]
 687         out_c = out_c + ") {\n"
 688         out_c = out_c + "\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n"
 689         out_c = out_c + "\t*res_ptr = " + struct_name + "_init(env, clz, o"
 690         for var in field_vars:
 691             if isinstance(var, ConvInfo):
 692                 out_c = out_c + ", " + var.arg_name
 693             else:
 694                 out_c = out_c + ", " + var[1]
 695         out_c = out_c + ");\n"
 696         out_c = out_c + "\treturn (long)res_ptr;\n"
 697         out_c = out_c + "}\n"
 698
 699         out_c = out_c + self.c_fn_ty_pfx + "jobject " + self.c_fn_name_pfx + struct_name.replace("_", "_1") + "_1get_1obj_1from_1jcalls (" + self.c_fn_args_pfx + ", " + self.ptr_c_ty + " val) {\n"
 700         out_c = out_c + "\tjobject ret = (*env)->NewLocalRef(env, ((" + struct_name + "_JCalls*)val)->o);\n"
 701         out_c = out_c + "\tCHECK(ret != NULL);\n"
 702         out_c = out_c + "\treturn ret;\n"
 703         out_c = out_c + "}\n"
 704
 705         return (out_java, out_java_trait, out_c)
 706
 707     def map_complex_enum(self, struct_name, variant_list, camel_to_snake):
 708         java_hu_type = struct_name.replace("LDK", "")
 709         out_java_enum = ""
 710         out_java = ""
 711         out_c = ""
 712
 713         out_java_enum += (self.hu_struct_file_prefix)
 714         out_java_enum += ("public class " + java_hu_type + " extends CommonBase {\n")
 715         out_java_enum += ("\tprivate " + java_hu_type + "(Object _dummy, long ptr) { super(ptr); }\n")
 716         out_java_enum += ("\t@Override @SuppressWarnings(\"deprecation\")\n")
 717         out_java_enum += ("\tprotected void finalize() throws Throwable {\n")
 718         out_java_enum += ("\t\tsuper.finalize();\n")
 719         out_java_enum += ("\t\tif (ptr != 0) { bindings." + java_hu_type + "_free(ptr); }\n")
 720         out_java_enum += ("\t}\n")
 721         out_java_enum += ("\tstatic " + java_hu_type + " constr_from_ptr(long ptr) {\n")
 722         out_java_enum += ("\t\tbindings." + struct_name + " raw_val = bindings." + struct_name + "_ref_from_ptr(ptr);\n")
 723         java_hu_subclasses = ""
 724
 725         init_meth_jty_strs = {}
 726
 727         out_java +=  ("\tpublic static class " + struct_name + " {\n")
 728         out_java +=  ("\t\tprivate " + struct_name + "() {}\n")
 729         for var in variant_list:
 730             out_java +=  ("\t\tpublic final static class " + var.var_name + " extends " + struct_name + " {\n")
 731             java_hu_subclasses = java_hu_subclasses + "\tpublic final static class " + var.var_name + " extends " + java_hu_type + " {\n"
 732             out_java_enum += ("\t\tif (raw_val.getClass() == bindings." + struct_name + "." + var.var_name + ".class) {\n")
 733             out_java_enum += ("\t\t\treturn new " + var.var_name + "(ptr, (bindings." + struct_name + "." + var.var_name + ")raw_val);\n")
 734             init_meth_jty_str = ""
 735             init_meth_params = ""
 736             init_meth_body = ""
 737             hu_conv_body = ""
 738             for idx, field_ty in enumerate(var.fields):
 739                 out_java += ("\t\t\tpublic " + field_ty.java_ty + " " + field_ty.arg_name + ";\n")
 740                 java_hu_subclasses = java_hu_subclasses + "\t\tpublic final " + field_ty.java_hu_ty + " " + field_ty.arg_name + ";\n"
 741                 if field_ty.to_hu_conv is not None:
 742                     hu_conv_body = hu_conv_body + "\t\t\t" + field_ty.java_ty + " " + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
 743                     hu_conv_body = hu_conv_body + "\t\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
 744                     hu_conv_body = hu_conv_body + "\t\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
 745                 else:
 746                     hu_conv_body = hu_conv_body + "\t\t\tthis." + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
 747                 init_meth_jty_str = init_meth_jty_str + field_ty.java_fn_ty_arg
 748                 if idx > 0:
 749                     init_meth_params = init_meth_params + ", "
 750                 init_meth_params = init_meth_params + field_ty.java_ty + " " + field_ty.arg_name
 751                 init_meth_body = init_meth_body + "this." + field_ty.arg_name + " = " + field_ty.arg_name + "; "
 752             out_java +=  ("\t\t\t" + var.var_name + "(" + init_meth_params + ") { ")
 753             out_java +=  (init_meth_body)
 754             out_java +=  ("}\n")
 755             out_java += ("\t\t}\n")
 756             out_java_enum += ("\t\t}\n")
 757             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"
 758             java_hu_subclasses = java_hu_subclasses + hu_conv_body
 759             java_hu_subclasses = java_hu_subclasses + "\t\t}\n\t}\n"
 760             init_meth_jty_strs[var.var_name] = init_meth_jty_str
 761         out_java += ("\t\tstatic native void init();\n")
 762         out_java += ("\t}\n")
 763         out_java_enum += ("\t\tassert false; return null; // Unreachable without extending the (internal) bindings interface\n\t}\n\n")
 764         out_java_enum += (java_hu_subclasses)
 765         out_java += ("\tstatic { " + struct_name + ".init(); }\n")
 766         out_java += ("\tpublic static native " + struct_name + " " + struct_name + "_ref_from_ptr(long ptr);\n");
 767
 768         out_c += (self.c_complex_enum_pfx(struct_name, [x.var_name for x in variant_list], init_meth_jty_strs))
 769
 770         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")
 771         out_c += ("\t" + struct_name + " *obj = (" + struct_name + "*)ptr;\n")
 772         out_c += ("\tswitch(obj->tag) {\n")
 773         for var in variant_list:
 774             out_c += ("\t\tcase " + struct_name + "_" + var.var_name + ": {\n")
 775             c_params = []
 776             for idx, field_map in enumerate(var.fields):
 777                 if field_map.ret_conv is not None:
 778                     out_c += ("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
 779                     out_c += ("obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name)
 780                     out_c += (field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
 781                     c_params.append(field_map.ret_conv_name)
 782                 else:
 783                     c_params.append("obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name)
 784             out_c += ("\t\t\treturn " + self.c_constr_native_complex_enum(struct_name, var.var_name, c_params) + ";\n")
 785             out_c += ("\t\t}\n")
 786         out_c += ("\t\tdefault: abort();\n")
 787         out_c += ("\t}\n}\n")
 788         out_java_enum += ("}\n")
 789         return (out_java, out_java_enum, out_c)
 790
 791     def map_opaque_struct(self, struct_name):
 792         out_opaque_struct_human = ""
 793         out_opaque_struct_human += self.hu_struct_file_prefix
 794         out_opaque_struct_human += ("public class " + struct_name.replace("LDK","") + " extends CommonBase")
 795         if struct_name.startswith("LDKLocked"):
 796             out_opaque_struct_human += (" implements AutoCloseable")
 797         out_opaque_struct_human += (" {\n")
 798         out_opaque_struct_human += ("\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); }\n")
 799         if struct_name.startswith("LDKLocked"):
 800             out_opaque_struct_human += ("\t@Override public void close() {\n")
 801         else:
 802             out_opaque_struct_human += ("\t@Override @SuppressWarnings(\"deprecation\")\n")
 803             out_opaque_struct_human += ("\tprotected void finalize() throws Throwable {\n")
 804             out_opaque_struct_human += ("\t\tsuper.finalize();\n")
 805         out_opaque_struct_human += ("\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); }\n")
 806         out_opaque_struct_human += ("\t}\n\n")
 807         return out_opaque_struct_human
 808
 809
 810     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):
 811         out_java = ""
 812         out_c = ""
 813         out_java_struct = None
 814
 815         out_java += ("\tpublic static native ")
 816         out_c += (self.c_fn_ty_pfx)
 817         out_c += (return_type_info.c_ty)
 818         out_java += (return_type_info.java_ty)
 819         if return_type_info.ret_conv is not None:
 820             ret_conv_pfx, ret_conv_sfx = return_type_info.ret_conv
 821         out_java += (" " + method_name + "(")
 822         out_c += (" " + self.c_fn_name_pfx + method_name.replace('_', '_1') + "(" + self.c_fn_args_pfx)
 823
 824         for idx, arg_conv_info in enumerate(argument_types):
 825             if idx != 0:
 826                 out_java += (", ")
 827             if arg_conv_info.c_ty != "void":
 828                 out_c += (", ")
 829             if arg_conv_info.c_ty != "void":
 830                 out_c += (arg_conv_info.c_ty + " " + arg_conv_info.arg_name)
 831                 out_java += (arg_conv_info.java_ty + " " + arg_conv_info.arg_name)
 832
 833         if has_out_java_struct:
 834             out_java_struct = ""
 835             if not args_known:
 836                 out_java_struct += ("\t// Skipped " + method_name + "\n")
 837                 has_out_java_struct = False
 838             else:
 839                 meth_n = method_name[len(struct_meth) + 1:]
 840                 if not takes_self:
 841                     out_java_struct += (
 842                         "\tpublic static " + return_type_info.java_hu_ty + " constructor_" + meth_n + "(")
 843                 else:
 844                     out_java_struct += ("\tpublic " + return_type_info.java_hu_ty + " " + meth_n + "(")
 845                 for idx, arg in enumerate(argument_types):
 846                     if idx != 0:
 847                         if not takes_self or idx > 1:
 848                             out_java_struct += (", ")
 849                     elif takes_self:
 850                         continue
 851                     if arg.java_ty != "void":
 852                         if arg.arg_name in default_constructor_args:
 853                             for explode_idx, explode_arg in enumerate(default_constructor_args[arg.arg_name]):
 854                                 if explode_idx != 0:
 855                                     out_java_struct += (", ")
 856                                 out_java_struct += (
 857                                     explode_arg.java_hu_ty + " " + arg.arg_name + "_" + explode_arg.arg_name)
 858                         else:
 859                             out_java_struct += (arg.java_hu_ty + " " + arg.arg_name)
 860         out_java += (");\n")
 861         out_c += (") {\n")
 862         if out_java_struct is not None:
 863             out_java_struct += (") {\n")
 864         for info in argument_types:
 865             if info.arg_conv is not None:
 866                 out_c += ("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
 867         if return_type_info.ret_conv is not None:
 868             out_c += ("\t" + ret_conv_pfx.replace('\n', '\n\t'))
 869         elif return_type_info.c_ty != "void":
 870             out_c += ("\t" + return_type_info.c_ty + " ret_val = ")
 871         else:
 872             out_c += ("\t")
 873         if c_call_string is None:
 874             out_c += (method_name + "(")
 875         else:
 876             out_c += (c_call_string)
 877         for idx, info in enumerate(argument_types):
 878             if info.arg_conv_name is not None:
 879                 if idx != 0:
 880                     out_c += (", ")
 881                 elif c_call_string is not None:
 882                     continue
 883                 out_c += (info.arg_conv_name)
 884         out_c += (")")
 885         if return_type_info.ret_conv is not None:
 886             out_c += (ret_conv_sfx.replace('\n', '\n\t'))
 887         else:
 888             out_c += (";")
 889         for info in argument_types:
 890             if info.arg_conv_cleanup is not None:
 891                 out_c += ("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
 892         if return_type_info.ret_conv is not None:
 893             out_c += ("\n\treturn " + return_type_info.ret_conv_name + ";")
 894         elif return_type_info.c_ty != "void":
 895             out_c += ("\n\treturn ret_val;")
 896         out_c += ("\n}\n\n")
 897
 898         if has_out_java_struct:
 899             out_java_struct += ("\t\t")
 900             if return_type_info.java_ty != "void":
 901                 out_java_struct += (return_type_info.java_ty + " ret = ")
 902             out_java_struct += ("bindings." + method_name + "(")
 903             for idx, info in enumerate(argument_types):
 904                 if idx != 0:
 905                     out_java_struct += (", ")
 906                 if idx == 0 and takes_self:
 907                     out_java_struct += ("this.ptr")
 908                 elif info.arg_name in default_constructor_args:
 909                     out_java_struct += ("bindings." + info.java_hu_ty + "_new(")
 910                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
 911                         if explode_idx != 0:
 912                             out_java_struct += (", ")
 913                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
 914                         if explode_arg.from_hu_conv is not None:
 915                             out_java_struct += (
 916                                 explode_arg.from_hu_conv[0].replace(explode_arg.arg_name, expl_arg_name))
 917                         else:
 918                             out_java_struct += (expl_arg_name)
 919                     out_java_struct += (")")
 920                 elif info.from_hu_conv is not None:
 921                     out_java_struct += (info.from_hu_conv[0])
 922                 else:
 923                     out_java_struct += (info.arg_name)
 924             out_java_struct += (");\n")
 925             if return_type_info.to_hu_conv is not None:
 926                 if not takes_self:
 927                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t").replace("this",
 928                                                                                                                return_type_info.to_hu_conv_name) + "\n")
 929                 else:
 930                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t") + "\n")
 931
 932             for idx, info in enumerate(argument_types):
 933                 if idx == 0 and takes_self:
 934                     pass
 935                 elif info.arg_name in default_constructor_args:
 936                     for explode_arg in default_constructor_args[info.arg_name]:
 937                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
 938                         if explode_arg.from_hu_conv is not None and return_type_info.to_hu_conv_name:
 939                             out_java_struct += ("\t\t" + explode_arg.from_hu_conv[1].replace(explode_arg.arg_name,
 940                                                                                                expl_arg_name).replace(
 941                                 "this", return_type_info.to_hu_conv_name) + ";\n")
 942                 elif info.from_hu_conv is not None and info.from_hu_conv[1] != "":
 943                     if not takes_self and return_type_info.to_hu_conv_name is not None:
 944                         out_java_struct += (
 945                             "\t\t" + info.from_hu_conv[1].replace("this", return_type_info.to_hu_conv_name) + ";\n")
 946                     else:
 947                         out_java_struct += ("\t\t" + info.from_hu_conv[1] + ";\n")
 948
 949             if return_type_info.to_hu_conv_name is not None:
 950                 out_java_struct += ("\t\treturn " + return_type_info.to_hu_conv_name + ";\n")
 951             elif return_type_info.java_ty != "void" and return_type_info.rust_obj != "LDK" + struct_meth:
 952                 out_java_struct += ("\t\treturn ret;\n")
 953             out_java_struct += ("\t}\n\n")
 954
 955         return (out_java, out_c, out_java_struct)