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