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

   1 from bindingstypes import *
   2 from enum import Enum
   3
   4 class Target(Enum):
   5     JAVA = 1,
   6     ANDROID = 2
   7
   8 class Consts:
   9     def __init__(self, DEBUG: bool, target: Target, **kwargs):
  10         self.target = target
  11         self.c_array_class_caches = set()
  12         self.c_type_map = dict(
  13             uint8_t = ['byte'],
  14             uint16_t = ['short'],
  15             uint32_t = ['int'],
  16             uint64_t = ['long'],
  17         )
  18
  19         self.to_hu_conv_templates = dict(
  20             ptr = '{human_type} {var_name}_hu_conv = new {human_type}(null, {var_name});',
  21             default = '{human_type} {var_name}_hu_conv = new {human_type}(null, {var_name});'
  22         )
  23
  24         self.bindings_header = """package org.ldk.impl;
  25 import org.ldk.enums.*;
  26
  27 public class bindings {
  28         public static class VecOrSliceDef {
  29                 public long dataptr;
  30                 public long datalen;
  31                 public long stride;
  32                 public VecOrSliceDef(long dataptr, long datalen, long stride) {
  33                         this.dataptr = dataptr; this.datalen = datalen; this.stride = stride;
  34                 }
  35         }
  36         static {
  37                 System.loadLibrary(\"lightningjni\");
  38                 init(java.lang.Enum.class, VecOrSliceDef.class);
  39                 init_class_cache();
  40         }
  41         static native void init(java.lang.Class c, java.lang.Class slicedef);
  42         static native void init_class_cache();
  43
  44         public static native boolean deref_bool(long ptr);
  45         public static native long deref_long(long ptr);
  46         public static native void free_heap_ptr(long ptr);
  47         public static native byte[] read_bytes(long ptr, long len);
  48         public static native byte[] get_u8_slice_bytes(long slice_ptr);
  49         public static native long bytes_to_u8_vec(byte[] bytes);
  50         public static native long new_txpointer_copy_data(byte[] txdata);
  51         public static native void txpointer_free(long ptr);
  52         public static native byte[] txpointer_get_buffer(long ptr);
  53         public static native long vec_slice_len(long vec);
  54         public static native long new_empty_slice_vec();
  55
  56 """
  57
  58         self.bindings_footer = "}\n"
  59
  60         self.util_fn_pfx = """package org.ldk.structs;
  61 import org.ldk.impl.bindings;
  62 import java.util.Arrays;
  63 import org.ldk.enums.*;
  64
  65 public class UtilMethods {
  66 """
  67         self.util_fn_sfx = "}"
  68         self.common_base = """package org.ldk.structs;
  69 import java.util.LinkedList;
  70 class CommonBase {
  71         long ptr;
  72         LinkedList<Object> ptrs_to = new LinkedList();
  73         protected CommonBase(long ptr) { this.ptr = ptr; }
  74         public long _test_only_get_ptr() { return this.ptr; }
  75 }
  76 """
  77
  78         self.c_file_pfx = """#include \"org_ldk_impl_bindings.h\"
  79 #include <rust_types.h>
  80 #include <lightning.h>
  81 #include <string.h>
  82 #include <stdatomic.h>
  83 #include <stdlib.h>
  84
  85 """
  86
  87         if not DEBUG:
  88             self.c_file_pfx = self.c_file_pfx + """#define MALLOC(a, _) malloc(a)
  89 #define FREE(p) if ((long)(p) > 1024) { free(p); }
  90 #define DO_ASSERT(a) (void)(a)
  91 #define CHECK(a)
  92 """
  93         else:
  94             self.c_file_pfx = self.c_file_pfx + """#include <assert.h>
  95 // Always run a, then assert it is true:
  96 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
  97 // Assert a is true or do nothing
  98 #define CHECK(a) DO_ASSERT(a)
  99
 100 // Running a leak check across all the allocations and frees of the JDK is a mess,
 101 // so instead we implement our own naive leak checker here, relying on the -wrap
 102 // linker option to wrap malloc/calloc/realloc/free, tracking everyhing allocated
 103 // and free'd in Rust or C across the generated bindings shared library.
 104 #include <threads.h>
 105 #include <execinfo.h>
 106 #include <unistd.h>
 107 static mtx_t allocation_mtx;
 108
 109 void __attribute__((constructor)) init_mtx() {
 110         DO_ASSERT(mtx_init(&allocation_mtx, mtx_plain) == thrd_success);
 111 }
 112
 113 #define BT_MAX 128
 114 typedef struct allocation {
 115         struct allocation* next;
 116         void* ptr;
 117         const char* struct_name;
 118         void* bt[BT_MAX];
 119         int bt_len;
 120         size_t alloc_len;
 121 } allocation;
 122 static allocation* allocation_ll = NULL;
 123
 124 void* __real_malloc(size_t len);
 125 void* __real_calloc(size_t nmemb, size_t len);
 126 static void new_allocation(void* res, const char* struct_name, size_t len) {
 127         allocation* new_alloc = __real_malloc(sizeof(allocation));
 128         new_alloc->ptr = res;
 129         new_alloc->struct_name = struct_name;
 130         new_alloc->bt_len = backtrace(new_alloc->bt, BT_MAX);
 131         new_alloc->alloc_len = len;
 132         DO_ASSERT(mtx_lock(&allocation_mtx) == thrd_success);
 133         new_alloc->next = allocation_ll;
 134         allocation_ll = new_alloc;
 135         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
 136 }
 137 static void* MALLOC(size_t len, const char* struct_name) {
 138         void* res = __real_malloc(len);
 139         new_allocation(res, struct_name, len);
 140         return res;
 141 }
 142 void __real_free(void* ptr);
 143 static void alloc_freed(void* ptr) {
 144         allocation* p = NULL;
 145         DO_ASSERT(mtx_lock(&allocation_mtx) == thrd_success);
 146         allocation* it = allocation_ll;
 147         while (it->ptr != ptr) {
 148                 p = it; it = it->next;
 149                 if (it == NULL) {
 150                         fprintf(stderr, "Tried to free unknown pointer %p at:\\n", ptr);
 151                         void* bt[BT_MAX];
 152                         int bt_len = backtrace(bt, BT_MAX);
 153                         backtrace_symbols_fd(bt, bt_len, STDERR_FILENO);
 154                         fprintf(stderr, "\\n\\n");
 155                         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
 156                         return; // addrsan should catch malloc-unknown and print more info than we have
 157                 }
 158         }
 159         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
 160         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
 161         DO_ASSERT(it->ptr == ptr);
 162         __real_free(it);
 163 }
 164 static void FREE(void* ptr) {
 165         if ((long)ptr < 1024) return; // Rust loves to create pointers to the NULL page for dummys
 166         alloc_freed(ptr);
 167         __real_free(ptr);
 168 }
 169
 170 void* __wrap_malloc(size_t len) {
 171         void* res = __real_malloc(len);
 172         new_allocation(res, "malloc call", len);
 173         return res;
 174 }
 175 void* __wrap_calloc(size_t nmemb, size_t len) {
 176         void* res = __real_calloc(nmemb, len);
 177         new_allocation(res, "calloc call", len);
 178         return res;
 179 }
 180 void __wrap_free(void* ptr) {
 181         if (ptr == NULL) return;
 182         alloc_freed(ptr);
 183         __real_free(ptr);
 184 }
 185
 186 void* __real_realloc(void* ptr, size_t newlen);
 187 void* __wrap_realloc(void* ptr, size_t len) {
 188         if (ptr != NULL) alloc_freed(ptr);
 189         void* res = __real_realloc(ptr, len);
 190         new_allocation(res, "realloc call", len);
 191         return res;
 192 }
 193 void __wrap_reallocarray(void* ptr, size_t new_sz) {
 194         // Rust doesn't seem to use reallocarray currently
 195         DO_ASSERT(false);
 196 }
 197
 198 void __attribute__((destructor)) check_leaks() {
 199         size_t alloc_count = 0;
 200         size_t alloc_size = 0;
 201         fprintf(stderr, "The following LDK-allocated blocks still remain.\\n");
 202         fprintf(stderr, "Note that this is only accurate if System.gc(); System.runFinalization()\\n");
 203         fprintf(stderr, "was called prior to exit after all LDK objects were out of scope.\\n");
 204         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 205                 fprintf(stderr, "%s %p (%lu bytes) remains:\\n", a->struct_name, a->ptr, a->alloc_len);
 206                 backtrace_symbols_fd(a->bt, a->bt_len, STDERR_FILENO);
 207                 fprintf(stderr, "\\n\\n");
 208                 alloc_count++;
 209                 alloc_size += a->alloc_len;
 210         }
 211         fprintf(stderr, "%lu allocations remained for %lu bytes.\\n", alloc_count, alloc_size);
 212         fprintf(stderr, "Note that this is only accurate if System.gc(); System.runFinalization()\\n");
 213         fprintf(stderr, "was called prior to exit after all LDK objects were out of scope.\\n");
 214 }
 215 """
 216         self.c_file_pfx = self.c_file_pfx + """
 217 static jmethodID ordinal_meth = NULL;
 218 static jmethodID slicedef_meth = NULL;
 219 static jclass slicedef_cls = NULL;
 220 JNIEXPORT void Java_org_ldk_impl_bindings_init(JNIEnv * env, jclass _b, jclass enum_class, jclass slicedef_class) {
 221         ordinal_meth = (*env)->GetMethodID(env, enum_class, "ordinal", "()I");
 222         CHECK(ordinal_meth != NULL);
 223         slicedef_meth = (*env)->GetMethodID(env, slicedef_class, "<init>", "(JJJ)V");
 224         CHECK(slicedef_meth != NULL);
 225         slicedef_cls = (*env)->NewGlobalRef(env, slicedef_class);
 226         CHECK(slicedef_cls != NULL);
 227 }
 228
 229 JNIEXPORT jboolean JNICALL Java_org_ldk_impl_bindings_deref_1bool (JNIEnv * env, jclass _a, jlong ptr) {
 230         return *((bool*)ptr);
 231 }
 232 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_deref_1long (JNIEnv * env, jclass _a, jlong ptr) {
 233         return *((long*)ptr);
 234 }
 235 JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_free_1heap_1ptr (JNIEnv * env, jclass _a, jlong ptr) {
 236         FREE((void*)ptr);
 237 }
 238 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_read_1bytes (JNIEnv * env, jclass _b, jlong ptr, jlong len) {
 239         jbyteArray ret_arr = (*env)->NewByteArray(env, len);
 240         (*env)->SetByteArrayRegion(env, ret_arr, 0, len, (unsigned char*)ptr);
 241         return ret_arr;
 242 }
 243 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_get_1u8_1slice_1bytes (JNIEnv * env, jclass _b, jlong slice_ptr) {
 244         LDKu8slice *slice = (LDKu8slice*)slice_ptr;
 245         jbyteArray ret_arr = (*env)->NewByteArray(env, slice->datalen);
 246         (*env)->SetByteArrayRegion(env, ret_arr, 0, slice->datalen, slice->data);
 247         return ret_arr;
 248 }
 249 JNIEXPORT int64_t impl_bindings_bytes_1to_1u8_1vec (JNIEnv * env, jclass _b, jbyteArray bytes) {
 250         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "LDKCVec_u8");
 251         vec->datalen = (*env)->GetArrayLength(env, bytes);
 252         vec->data = (uint8_t*)MALLOC(vec->datalen, "LDKCVec_u8Z Bytes");
 253         (*env)->GetByteArrayRegion (env, bytes, 0, vec->datalen, vec->data);
 254         return (long)vec;
 255 }
 256 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_txpointer_1get_1buffer (JNIEnv * env, jclass _b, jlong ptr) {
 257         LDKTransaction *txdata = (LDKTransaction*)ptr;
 258         LDKu8slice slice;
 259         slice.data = txdata->data;
 260         slice.datalen = txdata->datalen;
 261         return Java_org_ldk_impl_bindings_get_1u8_1slice_1bytes(env, _b, (long)&slice);
 262 }
 263 JNIEXPORT int64_t JNICALL Java_org_ldk_impl_bindings_new_1txpointer_1copy_1data (JNIEnv * env, jclass _b, jbyteArray bytes) {
 264         LDKTransaction *txdata = (LDKTransaction*)MALLOC(sizeof(LDKTransaction), "LDKTransaction");
 265         txdata->datalen = (*env)->GetArrayLength(env, bytes);
 266         txdata->data = (uint8_t*)MALLOC(txdata->datalen, "Tx Data Bytes");
 267         txdata->data_is_owned = false;
 268         (*env)->GetByteArrayRegion (env, bytes, 0, txdata->datalen, txdata->data);
 269         return (long)txdata;
 270 }
 271 JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_txpointer_1free (JNIEnv * env, jclass _b, jlong ptr) {
 272         LDKTransaction *tx = (LDKTransaction*)ptr;
 273         tx->data_is_owned = true;
 274         Transaction_free(*tx);
 275         FREE((void*)ptr);
 276 }
 277 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_vec_1slice_1len (JNIEnv * env, jclass _a, jlong ptr) {
 278         // Check offsets of a few Vec types are all consistent as we're meant to be generic across types
 279         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_SignatureZ, datalen), "Vec<*> needs to be mapped identically");
 280         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_MessageSendEventZ, datalen), "Vec<*> needs to be mapped identically");
 281         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_EventZ, datalen), "Vec<*> needs to be mapped identically");
 282         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_C2Tuple_usizeTransactionZZ, datalen), "Vec<*> needs to be mapped identically");
 283         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)ptr;
 284         return (long)vec->datalen;
 285 }
 286 JNIEXPORT int64_t JNICALL Java_org_ldk_impl_bindings_new_1empty_1slice_1vec (JNIEnv * env, jclass _b) {
 287         // Check sizes of a few Vec types are all consistent as we're meant to be generic across types
 288         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_SignatureZ), "Vec<*> needs to be mapped identically");
 289         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_MessageSendEventZ), "Vec<*> needs to be mapped identically");
 290         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_EventZ), "Vec<*> needs to be mapped identically");
 291         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_C2Tuple_usizeTransactionZZ), "Vec<*> needs to be mapped identically");
 292         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "Empty LDKCVec");
 293         vec->data = NULL;
 294         vec->datalen = 0;
 295         return (long)vec;
 296 }
 297
 298 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
 299 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
 300 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
 301 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
 302
 303 _Static_assert(sizeof(jlong) == sizeof(int64_t), "We assume that j-types are the same as C types");
 304 _Static_assert(sizeof(jbyte) == sizeof(char), "We assume that j-types are the same as C types");
 305 _Static_assert(sizeof(void*) <= 8, "Pointers must fit into 64 bits");
 306
 307 typedef jlongArray int64_tArray;
 308 typedef jbyteArray int8_tArray;
 309
 310 static inline jstring str_ref_to_java(JNIEnv *env, const char* chars, size_t len) {
 311         // Sadly we need to create a temporary because Java can't accept a char* without a 0-terminator
 312         char* err_buf = MALLOC(len + 1, "str conv buf");
 313         memcpy(err_buf, chars, len);
 314         err_buf[len] = 0;
 315         jstring err_conv = (*env)->NewStringUTF(env, chars);
 316         FREE(err_buf);
 317         return err_conv;
 318 }
 319 static inline LDKStr java_to_owned_str(JNIEnv *env, jstring str) {
 320         uint64_t str_len = (*env)->GetStringUTFLength(env, str);
 321         char* newchars = MALLOC(str_len + 1, "String chars");
 322         const char* jchars = (*env)->GetStringUTFChars(env, str, NULL);
 323         memcpy(newchars, jchars, str_len);
 324         newchars[str_len] = 0;
 325         (*env)->ReleaseStringUTFChars(env, str, jchars);
 326         LDKStr res = {
 327                 .chars = newchars,
 328                 .len = str_len,
 329                 .chars_is_owned = true
 330         };
 331         return res;
 332 }
 333 """
 334
 335         self.hu_struct_file_prefix = """package org.ldk.structs;
 336
 337 import org.ldk.impl.bindings;
 338 import org.ldk.enums.*;
 339 import org.ldk.util.*;
 340 import java.util.Arrays;
 341
 342 """
 343         self.c_fn_ty_pfx = "JNIEXPORT "
 344         self.c_fn_args_pfx = "JNIEnv *env, jclass clz"
 345         self.file_ext = ".java"
 346         self.ptr_c_ty = "int64_t"
 347         self.ptr_native_ty = "long"
 348         self.result_c_ty = "jclass"
 349         self.ptr_arr = "jobjectArray"
 350         self.get_native_arr_len_call = ("(*env)->GetArrayLength(env, ", ")")
 351
 352     def release_native_arr_ptr_call(self, ty_info, arr_var, arr_ptr_var):
 353         if ty_info.subty is None or not ty_info.subty.c_ty.endswith("Array"):
 354             return "(*env)->ReleasePrimitiveArrayCritical(env, " + arr_var + ", " + arr_ptr_var + ", 0)"
 355         return None
 356     def create_native_arr_call(self, arr_len, ty_info):
 357         if ty_info.c_ty == "int8_tArray":
 358             return "(*env)->NewByteArray(env, " + arr_len + ")"
 359         elif ty_info.subty.c_ty.endswith("Array"):
 360             clz_var = ty_info.java_fn_ty_arg[1:].replace("[", "arr_of_")
 361             self.c_array_class_caches.add(clz_var)
 362             return "(*env)->NewObjectArray(env, " + arr_len + ", " + clz_var + "_clz, NULL);\n"
 363         else:
 364             return "(*env)->New" + ty_info.java_ty.strip("[]").title() + "Array(env, " + arr_len + ")"
 365     def set_native_arr_contents(self, arr_name, arr_len, ty_info):
 366         if ty_info.c_ty == "int8_tArray":
 367             return ("(*env)->SetByteArrayRegion(env, " + arr_name + ", 0, " + arr_len + ", ", ")")
 368         else:
 369             assert False
 370     def get_native_arr_contents(self, arr_name, dest_name, arr_len, ty_info, copy):
 371         if ty_info.c_ty == "int8_tArray":
 372             if copy:
 373                 return "(*env)->GetByteArrayRegion(env, " + arr_name + ", 0, " + arr_len + ", " + dest_name + ")"
 374             else:
 375                 return "(*env)->GetByteArrayElements (env, " + arr_name + ", NULL)"
 376         elif not ty_info.java_ty[:len(ty_info.java_ty) - 2].endswith("[]"):
 377             return "(*env)->Get" + ty_info.subty.java_ty.title() + "ArrayElements (env, " + arr_name + ", NULL)"
 378         else:
 379             return None
 380     def get_native_arr_elem(self, arr_name, idxc, ty_info):
 381         if self.get_native_arr_contents(arr_name, "", "", ty_info, False) is None:
 382             return "(*env)->GetObjectArrayElement(env, " + arr_name + ", " + idxc + ")"
 383         else:
 384             assert False # Only called if above is None
 385     def get_native_arr_ptr_call(self, ty_info):
 386         if ty_info.subty is not None and ty_info.subty.c_ty.endswith("Array"):
 387             return None
 388         return ("(*env)->GetPrimitiveArrayCritical(env, ", ", NULL)")
 389     def get_native_arr_entry_call(self, ty_info, arr_name, idxc, entry_access):
 390         if ty_info.subty is None or not ty_info.subty.c_ty.endswith("Array"):
 391             return None
 392         return "(*env)->SetObjectArrayElement(env, " + arr_name + ", " + idxc + ", " + entry_access + ")"
 393     def cleanup_native_arr_ref_contents(self, arr_name, dest_name, arr_len, ty_info):
 394         if ty_info.c_ty == "int8_tArray":
 395             return "(*env)->ReleaseByteArrayElements(env, " + arr_name + ", (int8_t*)" + dest_name + ", 0);"
 396         else:
 397             return "(*env)->Release" + ty_info.java_ty.strip("[]").title() + "ArrayElements(env, " + arr_name + ", " + dest_name + ", 0)"
 398
 399     def str_ref_to_native_call(self, var_name, str_len):
 400         return "str_ref_to_java(env, " + var_name + ", " + str_len + ")"
 401     def str_ref_to_c_call(self, var_name):
 402         return "java_to_owned_str(env, " + var_name + ")"
 403
 404     def c_fn_name_define_pfx(self, fn_name, has_args):
 405         if has_args:
 406             return "JNICALL Java_org_ldk_impl_bindings_" + fn_name.replace("_", "_1") + "(JNIEnv *env, jclass clz, "
 407         return "JNICALL Java_org_ldk_impl_bindings_" + fn_name.replace("_", "_1") + "(JNIEnv *env, jclass clz"
 408
 409     def init_str(self):
 410         res = ""
 411         for ty in sorted(self.c_array_class_caches):
 412             res = res + "static jclass " + ty + "_clz = NULL;\n"
 413         res = res + "JNIEXPORT void Java_org_ldk_impl_bindings_init_1class_1cache(JNIEnv * env, jclass clz) {\n"
 414         for ty in sorted(self.c_array_class_caches):
 415             res = res + "\t" + ty + "_clz = (*env)->FindClass(env, \"" + ty.replace("arr_of_", "[") + "\");\n"
 416             res = res + "\tCHECK(" + ty + "_clz != NULL);\n"
 417             res = res + "\t" + ty + "_clz = (*env)->NewGlobalRef(env, " + ty + "_clz);\n"
 418         res = res + "}\n"
 419         return res
 420
 421     def native_c_unitary_enum_map(self, struct_name, variants, enum_doc_comment):
 422         out_java_enum = "package org.ldk.enums;\n\n"
 423         out_java = ""
 424         out_c = ""
 425         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_from_java(" + self.c_fn_args_pfx + ") {\n"
 426         out_c = out_c + "\tswitch ((*env)->CallIntMethod(env, clz, ordinal_meth)) {\n"
 427
 428         if enum_doc_comment is not None:
 429             out_java_enum += "/**\n * " + enum_doc_comment.replace("\n", "\n * ") + "\n */\n"
 430         out_java_enum += "public enum " + struct_name + " {\n"
 431         ord_v = 0
 432         for var in variants:
 433             out_java_enum = out_java_enum + "\t" + var + ",\n"
 434             out_c = out_c + "\t\tcase %d: return %s;\n" % (ord_v, var)
 435             ord_v = ord_v + 1
 436         out_java_enum = out_java_enum + "\t; static native void init();\n"
 437         out_java_enum = out_java_enum + "\tstatic { init(); }\n"
 438         out_java_enum = out_java_enum + "}"
 439         out_java = out_java + "\tstatic { " + struct_name + ".values(); /* Force enum statics to run */ }\n"
 440         out_c = out_c + "\t}\n"
 441         out_c = out_c + "\tabort();\n"
 442         out_c = out_c + "}\n"
 443
 444         out_c = out_c + "static jclass " + struct_name + "_class = NULL;\n"
 445         for var in variants:
 446             out_c = out_c + "static jfieldID " + struct_name + "_" + var + " = NULL;\n"
 447         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"
 448         out_c = out_c + "\t" + struct_name + "_class = (*env)->NewGlobalRef(env, clz);\n"
 449         out_c = out_c + "\tCHECK(" + struct_name + "_class != NULL);\n"
 450         for var in variants:
 451             out_c = out_c + "\t" + struct_name + "_" + var + " = (*env)->GetStaticFieldID(env, " + struct_name + "_class, \"" + var + "\", \"Lorg/ldk/enums/" + struct_name + ";\");\n"
 452             out_c = out_c + "\tCHECK(" + struct_name + "_" + var + " != NULL);\n"
 453         out_c = out_c + "}\n"
 454         out_c = out_c + "static inline jclass " + struct_name + "_to_java(JNIEnv *env, " + struct_name + " val) {\n"
 455         out_c = out_c + "\tswitch (val) {\n"
 456         ord_v = 0
 457         for var in variants:
 458             out_c = out_c + "\t\tcase " + var + ":\n"
 459             out_c = out_c + "\t\t\treturn (*env)->GetStaticObjectField(env, " + struct_name + "_class, " + struct_name + "_" + var + ");\n"
 460             ord_v = ord_v + 1
 461         out_c = out_c + "\t\tdefault: abort();\n"
 462         out_c = out_c + "\t}\n"
 463         out_c = out_c + "}\n\n"
 464
 465         return (out_c, out_java_enum, out_java)
 466
 467     def c_unitary_enum_to_native_call(self, ty_info):
 468         return (ty_info.rust_obj + "_to_java(env, ", ")")
 469     def native_unitary_enum_to_c_call(self, ty_info):
 470         return (ty_info.rust_obj + "_from_java(env, ", ")")
 471
 472     def c_complex_enum_pfx(self, struct_name, variants, init_meth_jty_strs):
 473         out_c = ""
 474         for var in variants:
 475             out_c = out_c + "static jclass " + struct_name + "_" + var + "_class = NULL;\n"
 476             out_c = out_c + "static jmethodID " + struct_name + "_" + var + "_meth = NULL;\n"
 477         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"
 478         for var_name in variants:
 479             out_c = out_c + "\t" + struct_name + "_" + var_name + "_class =\n"
 480             if self.target == Target.ANDROID:
 481                 out_c = out_c + "\t\t(*env)->NewGlobalRef(env, (*env)->FindClass(env, \"org/ldk/impl/bindings$" + struct_name + "$" + var_name + "\"));\n"
 482             else:
 483                 out_c = out_c + "\t\t(*env)->NewGlobalRef(env, (*env)->FindClass(env, \"Lorg/ldk/impl/bindings$" + struct_name + "$" + var_name + ";\"));\n"
 484             out_c = out_c + "\tCHECK(" + struct_name + "_" + var_name + "_class != NULL);\n"
 485             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"
 486             out_c = out_c + "\tCHECK(" + struct_name + "_" + var_name + "_meth != NULL);\n"
 487         out_c = out_c + "}\n"
 488         return out_c
 489
 490     def c_complex_enum_pass_ty(self, struct_name):
 491         return "jobject"
 492
 493     def c_constr_native_complex_enum(self, struct_name, variant, c_params):
 494         ret = "(*env)->NewObject(env, " + struct_name + "_" + variant + "_class, " + struct_name + "_" + variant + "_meth"
 495         for param in c_params:
 496             ret = ret + ", " + param
 497         return ret + ")"
 498
 499     def native_c_map_trait(self, struct_name, field_vars, flattened_field_vars, field_fns, trait_doc_comment):
 500         out_java_trait = ""
 501         out_java = ""
 502
 503         # First generate most of the Java code, note that we need information about java method argument strings for C
 504         out_java_trait = out_java_trait + self.hu_struct_file_prefix
 505         if trait_doc_comment is not None:
 506             out_java_trait += "/**\n * " + trait_doc_comment.replace("\n", "\n * ") + "\n */\n"
 507         out_java_trait += "@SuppressWarnings(\"unchecked\") // We correctly assign various generic arrays\n"
 508         out_java_trait = out_java_trait + "public class " + struct_name.replace("LDK","") + " extends CommonBase {\n"
 509         out_java_trait = out_java_trait + "\tfinal bindings." + struct_name + " bindings_instance;\n"
 510         out_java_trait = out_java_trait + "\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); bindings_instance = null; }\n"
 511         out_java_trait = out_java_trait + "\tprivate " + struct_name.replace("LDK", "") + "(bindings." + struct_name + " arg"
 512         for var in flattened_field_vars:
 513             if isinstance(var, ConvInfo):
 514                 out_java_trait = out_java_trait + ", " + var.java_hu_ty + " " + var.arg_name
 515             else:
 516                 out_java_trait = out_java_trait + ", bindings." + var[0] + " " + var[1]
 517         out_java_trait = out_java_trait + ") {\n"
 518         out_java_trait = out_java_trait + "\t\tsuper(bindings." + struct_name + "_new(arg"
 519         for var in flattened_field_vars:
 520             if isinstance(var, ConvInfo):
 521                 if var.from_hu_conv is not None:
 522                     out_java_trait = out_java_trait + ", " + var.from_hu_conv[0]
 523                 else:
 524                     out_java_trait = out_java_trait + ", " + var.arg_name
 525             else:
 526                 out_java_trait = out_java_trait + ", " + var[1]
 527         out_java_trait = out_java_trait + "));\n"
 528         out_java_trait = out_java_trait + "\t\tthis.ptrs_to.add(arg);\n"
 529         for var in flattened_field_vars:
 530             if isinstance(var, ConvInfo):
 531                 if var.from_hu_conv is not None and var.from_hu_conv[1] != "":
 532                     out_java_trait = out_java_trait + "\t\t" + var.from_hu_conv[1].replace("\n", "\n\t\t") + ";\n"
 533             else:
 534                 out_java_trait = out_java_trait + "\t\tthis.ptrs_to.add(" + var[1] + ");\n"
 535         out_java_trait = out_java_trait + "\t\tthis.bindings_instance = arg;\n"
 536         out_java_trait = out_java_trait + "\t}\n"
 537         out_java_trait = out_java_trait + "\t@Override @SuppressWarnings(\"deprecation\")\n"
 538         out_java_trait = out_java_trait + "\tprotected void finalize() throws Throwable {\n"
 539         out_java_trait = out_java_trait + "\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); } super.finalize();\n"
 540         out_java_trait = out_java_trait + "\t}\n\n"
 541
 542         java_trait_constr = "\tprivate static class " + struct_name + "Holder { " + struct_name.replace("LDK", "") + " held; }\n"
 543         java_trait_constr = java_trait_constr + "\tpublic static " + struct_name.replace("LDK", "") + " new_impl(" + struct_name.replace("LDK", "") + "Interface arg"
 544         for var in flattened_field_vars:
 545             if isinstance(var, ConvInfo):
 546                 java_trait_constr = java_trait_constr + ", " + var.java_hu_ty + " " + var.arg_name
 547             else:
 548                 # Ideally we'd be able to take any instance of the interface, but our C code can only represent
 549                 # Java-implemented version, so we require users pass a Java implementation here :/
 550                 java_trait_constr = java_trait_constr + ", " + var[0].replace("LDK", "") + "." + var[0].replace("LDK", "") + "Interface " + var[1] + "_impl"
 551         java_trait_constr = java_trait_constr + ") {\n\t\tfinal " + struct_name + "Holder impl_holder = new " + struct_name + "Holder();\n"
 552         java_trait_constr = java_trait_constr + "\t\timpl_holder.held = new " + struct_name.replace("LDK", "") + "(new bindings." + struct_name + "() {\n"
 553         out_java_trait = out_java_trait + "\tpublic static interface " + struct_name.replace("LDK", "") + "Interface {\n"
 554         out_java = out_java + "\tpublic interface " + struct_name + " {\n"
 555         java_meths = []
 556         for fn_line in field_fns:
 557             java_meth_descr = "("
 558             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 559                 out_java = out_java + "\t\t " + fn_line.ret_ty_info.java_ty + " " + fn_line.fn_name + "("
 560                 java_trait_constr = java_trait_constr + "\t\t\t@Override public " + fn_line.ret_ty_info.java_ty + " " + fn_line.fn_name + "("
 561                 out_java_trait += "\t\t/**\n\t\t * " + fn_line.docs.replace("\n", "\n\t\t * ") + "\n\t\t */\n"
 562                 out_java_trait = out_java_trait + "\t\t" + fn_line.ret_ty_info.java_hu_ty + " " + fn_line.fn_name + "("
 563
 564                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 565                     if idx >= 1:
 566                         out_java = out_java + ", "
 567                         java_trait_constr = java_trait_constr + ", "
 568                         out_java_trait = out_java_trait + ", "
 569                     out_java = out_java + arg_conv_info.java_ty + " " + arg_conv_info.arg_name
 570                     out_java_trait = out_java_trait + arg_conv_info.java_hu_ty + " " + arg_conv_info.arg_name
 571                     java_trait_constr = java_trait_constr + arg_conv_info.java_ty + " " + arg_conv_info.arg_name
 572                     java_meth_descr = java_meth_descr + arg_conv_info.java_fn_ty_arg
 573                 java_meth_descr = java_meth_descr + ")" + fn_line.ret_ty_info.java_fn_ty_arg
 574                 java_meths.append((fn_line.fn_name, java_meth_descr))
 575
 576                 out_java = out_java + ");\n"
 577                 out_java_trait = out_java_trait + ");\n"
 578                 java_trait_constr = java_trait_constr + ") {\n"
 579
 580                 for arg_info in fn_line.args_ty:
 581                     if arg_info.to_hu_conv is not None:
 582                         java_trait_constr = java_trait_constr + "\t\t\t\t" + arg_info.to_hu_conv.replace("\n", "\n\t\t\t\t") + "\n"
 583
 584                 if fn_line.ret_ty_info.java_ty != "void":
 585                     java_trait_constr = java_trait_constr + "\t\t\t\t" + fn_line.ret_ty_info.java_hu_ty + " ret = arg." + fn_line.fn_name + "("
 586                 else:
 587                     java_trait_constr = java_trait_constr + "\t\t\t\targ." + fn_line.fn_name + "("
 588
 589                 for idx, arg_info in enumerate(fn_line.args_ty):
 590                     if idx != 0:
 591                         java_trait_constr = java_trait_constr + ", "
 592                     if arg_info.to_hu_conv_name is not None:
 593                         java_trait_constr = java_trait_constr + arg_info.to_hu_conv_name
 594                     else:
 595                         java_trait_constr = java_trait_constr + arg_info.arg_name
 596
 597                 java_trait_constr = java_trait_constr + ");\n"
 598                 if fn_line.ret_ty_info.java_ty != "void":
 599                     if fn_line.ret_ty_info.from_hu_conv is not None:
 600                         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"
 601                         if fn_line.ret_ty_info.from_hu_conv[1] != "":
 602                             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"
 603                         #if fn_line.ret_ty_info.rust_obj in result_types:
 604                         java_trait_constr = java_trait_constr + "\t\t\t\treturn result;\n"
 605                     else:
 606                         java_trait_constr = java_trait_constr + "\t\t\t\treturn ret;\n"
 607                 java_trait_constr = java_trait_constr + "\t\t\t}\n"
 608         java_trait_constr = java_trait_constr + "\t\t}"
 609         for var in field_vars:
 610             if isinstance(var, ConvInfo):
 611                 java_trait_constr = java_trait_constr + ", " + var.arg_name
 612             else:
 613                 java_trait_constr += ", " + var[1] + ".new_impl(" + var[1] + "_impl"
 614                 for suparg in var[2]:
 615                     if isinstance(suparg, ConvInfo):
 616                         java_trait_constr += ", " + suparg.arg_name
 617                     else:
 618                         java_trait_constr += ", " + suparg[1]
 619                 java_trait_constr += ").bindings_instance"
 620                 for suparg in var[2]:
 621                     if isinstance(suparg, ConvInfo):
 622                         java_trait_constr += ", " + suparg.arg_name
 623                     else:
 624                         java_trait_constr += ", " + suparg[1]
 625         out_java_trait = out_java_trait + "\t}\n"
 626         out_java_trait = out_java_trait + java_trait_constr + ");\n\t\treturn impl_holder.held;\n\t}\n"
 627
 628         out_java = out_java + "\t}\n"
 629
 630         out_java = out_java + "\tpublic static native long " + struct_name + "_new(" + struct_name + " impl"
 631         for var in flattened_field_vars:
 632             if isinstance(var, ConvInfo):
 633                 out_java = out_java + ", " + var.java_ty + " " + var.arg_name
 634             else:
 635                 out_java = out_java + ", " + var[0] + " " + var[1]
 636         out_java = out_java + ");\n"
 637
 638         # Now that we've written out our java code (and created java_meths), generate C
 639         out_c = "typedef struct " + struct_name + "_JCalls {\n"
 640         out_c = out_c + "\tatomic_size_t refcnt;\n"
 641         out_c = out_c + "\tJavaVM *vm;\n"
 642         out_c = out_c + "\tjweak o;\n"
 643         for var in flattened_field_vars:
 644             if isinstance(var, ConvInfo):
 645                 # We're a regular ol' field
 646                 pass
 647             else:
 648                 # We're a supertrait
 649                 out_c = out_c + "\t" + var[0] + "_JCalls* " + var[1] + ";\n"
 650         for fn in field_fns:
 651             if fn.fn_name != "free" and fn.fn_name != "clone":
 652                 out_c = out_c + "\tjmethodID " + fn.fn_name + "_meth;\n"
 653         out_c = out_c + "} " + struct_name + "_JCalls;\n"
 654
 655         for fn_line in field_fns:
 656             if fn_line.fn_name == "free":
 657                 out_c = out_c + "static void " + struct_name + "_JCalls_free(void* this_arg) {\n"
 658                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 659                 out_c = out_c + "\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n"
 660                 out_c = out_c + "\t\tJNIEnv *env;\n"
 661                 out_c = out_c + "\t\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_6) == JNI_OK);\n"
 662                 out_c = out_c + "\t\t(*env)->DeleteWeakGlobalRef(env, j_calls->o);\n"
 663                 out_c = out_c + "\t\tFREE(j_calls);\n"
 664                 out_c = out_c + "\t}\n}\n"
 665
 666         for idx, fn_line in enumerate(field_fns):
 667             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 668                 assert fn_line.ret_ty_info.ty_info.get_full_rust_ty()[1] == ""
 669                 out_c = out_c + fn_line.ret_ty_info.ty_info.get_full_rust_ty()[0] + " " + fn_line.fn_name + "_" + struct_name + "_jcall("
 670                 if fn_line.self_is_const:
 671                     out_c = out_c + "const void* this_arg"
 672                 else:
 673                     out_c = out_c + "void* this_arg"
 674
 675                 for idx, arg in enumerate(fn_line.args_ty):
 676                     out_c = out_c + ", " + arg.ty_info.get_full_rust_ty()[0] + " " + arg.arg_name + arg.ty_info.get_full_rust_ty()[1]
 677
 678                 out_c = out_c + ") {\n"
 679                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 680                 out_c = out_c + "\tJNIEnv *env;\n"
 681                 out_c = out_c + "\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_6) == JNI_OK);\n"
 682
 683                 for arg_info in fn_line.args_ty:
 684                     if arg_info.ret_conv is not None:
 685                         out_c = out_c + "\t" + arg_info.ret_conv[0].replace('\n', '\n\t')
 686                         out_c = out_c + arg_info.arg_name
 687                         out_c = out_c + arg_info.ret_conv[1].replace('\n', '\n\t') + "\n"
 688
 689                 out_c = out_c + "\tjobject obj = (*env)->NewLocalRef(env, j_calls->o);\n\tCHECK(obj != NULL);\n"
 690                 if fn_line.ret_ty_info.c_ty.endswith("Array"):
 691                     out_c = out_c + "\t" + fn_line.ret_ty_info.c_ty + " ret = (*env)->CallObjectMethod(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 692                 elif not fn_line.ret_ty_info.passed_as_ptr:
 693                     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"
 694                 else:
 695                     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"
 696
 697                 for idx, arg_info in enumerate(fn_line.args_ty):
 698                     if arg_info.ret_conv is not None:
 699                         out_c = out_c + ", " + arg_info.ret_conv_name
 700                     else:
 701                         out_c = out_c + ", " + arg_info.arg_name
 702                 out_c = out_c + ");\n"
 703                 if fn_line.ret_ty_info.arg_conv is not None:
 704                     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"
 705
 706                 out_c = out_c + "}\n"
 707
 708         # Write out a clone function whether we need one or not, as we use them in moving to rust
 709         out_c = out_c + "static void* " + struct_name + "_JCalls_clone(const void* this_arg) {\n"
 710         out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 711         out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n"
 712         for var in field_vars:
 713             if not isinstance(var, ConvInfo):
 714                 out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->" + var[1] + "->refcnt, 1, memory_order_release);\n"
 715         out_c = out_c + "\treturn (void*) this_arg;\n"
 716         out_c = out_c + "}\n"
 717
 718         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_init (" + self.c_fn_args_pfx + ", jobject o"
 719         for var in flattened_field_vars:
 720             if isinstance(var, ConvInfo):
 721                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 722             else:
 723                 out_c = out_c + ", jobject " + var[1]
 724         out_c = out_c + ") {\n"
 725
 726         out_c = out_c + "\tjclass c = (*env)->GetObjectClass(env, o);\n"
 727         out_c = out_c + "\tCHECK(c != NULL);\n"
 728         out_c = out_c + "\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n"
 729         out_c = out_c + "\tatomic_init(&calls->refcnt, 1);\n"
 730         out_c = out_c + "\tDO_ASSERT((*env)->GetJavaVM(env, &calls->vm) == 0);\n"
 731         out_c = out_c + "\tcalls->o = (*env)->NewWeakGlobalRef(env, o);\n"
 732
 733         for (fn_name, java_meth_descr) in java_meths:
 734             if fn_name != "free" and fn_name != "clone":
 735                 out_c = out_c + "\tcalls->" + fn_name + "_meth = (*env)->GetMethodID(env, c, \"" + fn_name + "\", \"" + java_meth_descr + "\");\n"
 736                 out_c = out_c + "\tCHECK(calls->" + fn_name + "_meth != NULL);\n"
 737
 738         for var in flattened_field_vars:
 739             if isinstance(var, ConvInfo) and var.arg_conv is not None:
 740                 out_c = out_c + "\n\t" + var.arg_conv.replace("\n", "\n\t") +"\n"
 741         out_c = out_c + "\n\t" + struct_name + " ret = {\n"
 742         out_c = out_c + "\t\t.this_arg = (void*) calls,\n"
 743         for fn_line in field_fns:
 744             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 745                 out_c = out_c + "\t\t." + fn_line.fn_name + " = " + fn_line.fn_name + "_" + struct_name + "_jcall,\n"
 746             elif fn_line.fn_name == "free":
 747                 out_c = out_c + "\t\t.free = " + struct_name + "_JCalls_free,\n"
 748             else:
 749                 out_c = out_c + "\t\t.clone = " + struct_name + "_JCalls_clone,\n"
 750         for var in field_vars:
 751             if isinstance(var, ConvInfo):
 752                 if var.arg_conv_name is not None:
 753                     out_c = out_c + "\t\t." + var.arg_name + " = " + var.arg_conv_name + ",\n"
 754                     out_c = out_c + "\t\t.set_" + var.arg_name + " = NULL,\n"
 755                 else:
 756                     out_c = out_c + "\t\t." + var.var_name + " = " + var.var_name + ",\n"
 757                     out_c = out_c + "\t\t.set_" + var.var_name + " = NULL,\n"
 758             else:
 759                 out_c += "\t\t." + var[1] + " = " + var[0] + "_init(env, clz, " + var[1]
 760                 for suparg in var[2]:
 761                     if isinstance(suparg, ConvInfo):
 762                         out_c = out_c + ", " + suparg.arg_name
 763                     else:
 764                         out_c = out_c + ", " + suparg[1]
 765                 out_c += "),\n"
 766         out_c = out_c + "\t};\n"
 767         for var in flattened_field_vars:
 768             if not isinstance(var, ConvInfo):
 769                 out_c = out_c + "\tcalls->" + var[1] + " = ret." + var[1] + ".this_arg;\n"
 770         out_c = out_c + "\treturn ret;\n"
 771         out_c = out_c + "}\n"
 772
 773         out_c = out_c + self.c_fn_ty_pfx + "int64_t " + self.c_fn_name_define_pfx(struct_name + "_new", True) + "jobject o"
 774         for var in flattened_field_vars:
 775             if isinstance(var, ConvInfo):
 776                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 777             else:
 778                 out_c = out_c + ", jobject " + var[1]
 779         out_c = out_c + ") {\n"
 780         out_c = out_c + "\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n"
 781         out_c = out_c + "\t*res_ptr = " + struct_name + "_init(env, clz, o"
 782         for var in flattened_field_vars:
 783             if isinstance(var, ConvInfo):
 784                 out_c = out_c + ", " + var.arg_name
 785             else:
 786                 out_c = out_c + ", " + var[1]
 787         out_c = out_c + ");\n"
 788         out_c = out_c + "\treturn (long)res_ptr;\n"
 789         out_c = out_c + "}\n"
 790
 791         return (out_java, out_java_trait, out_c)
 792
 793     def trait_struct_inc_refcnt(self, ty_info):
 794         base_conv = "\nif (" + ty_info.var_name + "_conv.free == " + ty_info.rust_obj + "_JCalls_free) {\n"
 795         base_conv = base_conv + "\t// If this_arg is a JCalls struct, then we need to increment the refcnt in it.\n"
 796         base_conv = base_conv + "\t" + ty_info.rust_obj + "_JCalls_clone(" + ty_info.var_name + "_conv.this_arg);\n}"
 797         return base_conv
 798
 799     def map_complex_enum(self, struct_name, variant_list, camel_to_snake, enum_doc_comment):
 800         java_hu_type = struct_name.replace("LDK", "").replace("COption", "Option")
 801         out_java_enum = ""
 802         out_java = ""
 803         out_c = ""
 804
 805         out_java_enum += (self.hu_struct_file_prefix)
 806         out_java_enum += "\n/**\n * " + enum_doc_comment.replace("\n", "\n * ") + "\n */\n"
 807         out_java_enum += "@SuppressWarnings(\"unchecked\") // We correctly assign various generic arrays\n"
 808         out_java_enum += ("public class " + java_hu_type + " extends CommonBase {\n")
 809         out_java_enum += ("\tprivate " + java_hu_type + "(Object _dummy, long ptr) { super(ptr); }\n")
 810         out_java_enum += ("\t@Override @SuppressWarnings(\"deprecation\")\n")
 811         out_java_enum += ("\tprotected void finalize() throws Throwable {\n")
 812         out_java_enum += ("\t\tsuper.finalize();\n")
 813         out_java_enum += ("\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK", "") + "_free(ptr); }\n")
 814         out_java_enum += ("\t}\n")
 815         out_java_enum += ("\tstatic " + java_hu_type + " constr_from_ptr(long ptr) {\n")
 816         out_java_enum += ("\t\tbindings." + struct_name + " raw_val = bindings." + struct_name + "_ref_from_ptr(ptr);\n")
 817         java_hu_subclasses = ""
 818
 819         init_meth_jty_strs = {}
 820
 821         out_java +=  ("\tpublic static class " + struct_name + " {\n")
 822         out_java +=  ("\t\tprivate " + struct_name + "() {}\n")
 823         for var in variant_list:
 824             out_java +=  ("\t\tpublic final static class " + var.var_name + " extends " + struct_name + " {\n")
 825             java_hu_subclasses = java_hu_subclasses + "\tpublic final static class " + var.var_name + " extends " + java_hu_type + " {\n"
 826             out_java_enum += ("\t\tif (raw_val.getClass() == bindings." + struct_name + "." + var.var_name + ".class) {\n")
 827             out_java_enum += ("\t\t\treturn new " + var.var_name + "(ptr, (bindings." + struct_name + "." + var.var_name + ")raw_val);\n")
 828             init_meth_jty_str = ""
 829             init_meth_params = ""
 830             init_meth_body = ""
 831             hu_conv_body = ""
 832             for idx, field_ty in enumerate(var.fields):
 833                 out_java += ("\t\t\tpublic " + field_ty.java_ty + " " + field_ty.arg_name + ";\n")
 834                 java_hu_subclasses = java_hu_subclasses + "\t\tpublic final " + field_ty.java_hu_ty + " " + field_ty.arg_name + ";\n"
 835                 if field_ty.to_hu_conv is not None:
 836                     hu_conv_body = hu_conv_body + "\t\t\t" + field_ty.java_ty + " " + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
 837                     hu_conv_body = hu_conv_body + "\t\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
 838                     hu_conv_body = hu_conv_body + "\t\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
 839                 else:
 840                     hu_conv_body = hu_conv_body + "\t\t\tthis." + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
 841                 init_meth_jty_str = init_meth_jty_str + field_ty.java_fn_ty_arg
 842                 if idx > 0:
 843                     init_meth_params = init_meth_params + ", "
 844                 init_meth_params = init_meth_params + field_ty.java_ty + " " + field_ty.arg_name
 845                 init_meth_body = init_meth_body + "this." + field_ty.arg_name + " = " + field_ty.arg_name + "; "
 846             out_java +=  ("\t\t\t" + var.var_name + "(" + init_meth_params + ") { ")
 847             out_java +=  (init_meth_body)
 848             out_java +=  ("}\n")
 849             out_java += ("\t\t}\n")
 850             out_java_enum += ("\t\t}\n")
 851             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"
 852             java_hu_subclasses = java_hu_subclasses + hu_conv_body
 853             java_hu_subclasses = java_hu_subclasses + "\t\t}\n\t}\n"
 854             init_meth_jty_strs[var.var_name] = init_meth_jty_str
 855         out_java += ("\t\tstatic native void init();\n")
 856         out_java += ("\t}\n")
 857         out_java_enum += ("\t\tassert false; return null; // Unreachable without extending the (internal) bindings interface\n\t}\n\n")
 858         out_java_enum += (java_hu_subclasses)
 859         out_java += ("\tstatic { " + struct_name + ".init(); }\n")
 860         out_java += ("\tpublic static native " + struct_name + " " + struct_name + "_ref_from_ptr(long ptr);\n");
 861
 862         out_c += (self.c_complex_enum_pfx(struct_name, [x.var_name for x in variant_list], init_meth_jty_strs))
 863
 864         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")
 865         out_c += ("\t" + struct_name + " *obj = (" + struct_name + "*)(ptr & ~1);\n")
 866         out_c += ("\tswitch(obj->tag) {\n")
 867         for var in variant_list:
 868             out_c += ("\t\tcase " + struct_name + "_" + var.var_name + ": {\n")
 869             c_params = []
 870             for idx, field_map in enumerate(var.fields):
 871                 if field_map.ret_conv is not None:
 872                     out_c += ("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
 873                     if var.tuple_variant:
 874                         out_c += "obj->" + camel_to_snake(var.var_name)
 875                     else:
 876                         out_c += "obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name
 877                     out_c += (field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
 878                     c_params.append(field_map.ret_conv_name)
 879                 else:
 880                     if var.tuple_variant:
 881                         c_params.append("obj->" + camel_to_snake(var.var_name))
 882                     else:
 883                         c_params.append("obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name)
 884             out_c += ("\t\t\treturn " + self.c_constr_native_complex_enum(struct_name, var.var_name, c_params) + ";\n")
 885             out_c += ("\t\t}\n")
 886         out_c += ("\t\tdefault: abort();\n")
 887         out_c += ("\t}\n}\n")
 888         return (out_java, out_java_enum, out_c)
 889
 890     def map_opaque_struct(self, struct_name, struct_doc_comment):
 891         out_opaque_struct_human = ""
 892         out_opaque_struct_human += self.hu_struct_file_prefix
 893         out_opaque_struct_human += "\n/**\n * " + struct_doc_comment.replace("\n", "\n * ") + "\n */\n"
 894         out_opaque_struct_human += "@SuppressWarnings(\"unchecked\") // We correctly assign various generic arrays\n"
 895         out_opaque_struct_human += ("public class " + struct_name.replace("LDK","") + " extends CommonBase")
 896         if struct_name.startswith("LDKLocked"):
 897             out_opaque_struct_human += (" implements AutoCloseable")
 898         out_opaque_struct_human += (" {\n")
 899         out_opaque_struct_human += ("\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); }\n")
 900         if struct_name.startswith("LDKLocked"):
 901             out_opaque_struct_human += ("\t@Override public void close() {\n")
 902         else:
 903             out_opaque_struct_human += ("\t@Override @SuppressWarnings(\"deprecation\")\n")
 904             out_opaque_struct_human += ("\tprotected void finalize() throws Throwable {\n")
 905             out_opaque_struct_human += ("\t\tsuper.finalize();\n")
 906         out_opaque_struct_human += ("\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); }\n")
 907         out_opaque_struct_human += ("\t}\n\n")
 908         return out_opaque_struct_human
 909
 910
 911     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, doc_comment):
 912         out_java = ""
 913         out_c = ""
 914         out_java_struct = None
 915
 916         out_java += ("\tpublic static native ")
 917         out_c += (self.c_fn_ty_pfx)
 918         out_c += (return_type_info.c_ty)
 919         out_java += (return_type_info.java_ty)
 920         if return_type_info.ret_conv is not None:
 921             ret_conv_pfx, ret_conv_sfx = return_type_info.ret_conv
 922         out_java += (" " + method_name + "(")
 923         have_args = len(argument_types) > 1 or (len(argument_types) > 0 and argument_types[0].c_ty != "void")
 924         out_c += (" " + self.c_fn_name_define_pfx(method_name, have_args))
 925
 926         for idx, arg_conv_info in enumerate(argument_types):
 927             if idx != 0:
 928                 out_java += (", ")
 929                 out_c += (", ")
 930             if arg_conv_info.c_ty != "void":
 931                 out_c += (arg_conv_info.c_ty + " " + arg_conv_info.arg_name)
 932                 out_java += (arg_conv_info.java_ty + " " + arg_conv_info.arg_name)
 933
 934         out_java_struct = ""
 935         if not args_known:
 936             out_java_struct += ("\t// Skipped " + method_name + "\n")
 937         else:
 938             meth_n = method_name[len(struct_meth) + 1:].strip("_")
 939             if doc_comment is not None:
 940                 out_java_struct += "\t/**\n\t * " + doc_comment.replace("\n", "\n\t * ") + "\n\t */\n"
 941             if not takes_self:
 942                 out_java_struct += (
 943                     "\tpublic static " + return_type_info.java_hu_ty + " constructor_" + meth_n + "(")
 944             else:
 945                 out_java_struct += ("\tpublic " + return_type_info.java_hu_ty + " " + meth_n + "(")
 946             for idx, arg in enumerate(argument_types):
 947                 if idx != 0:
 948                     if not takes_self or idx > 1:
 949                         out_java_struct += (", ")
 950                 elif takes_self:
 951                     continue
 952                 if arg.java_ty != "void":
 953                     if arg.arg_name in default_constructor_args:
 954                         for explode_idx, explode_arg in enumerate(default_constructor_args[arg.arg_name]):
 955                             if explode_idx != 0:
 956                                 out_java_struct += (", ")
 957                             out_java_struct += (
 958                                 explode_arg.java_hu_ty + " " + arg.arg_name + "_" + explode_arg.arg_name)
 959                     else:
 960                         out_java_struct += (arg.java_hu_ty + " " + arg.arg_name)
 961         out_java += (");\n")
 962         out_c += (") {\n")
 963         if out_java_struct is not None:
 964             out_java_struct += (") {\n")
 965         for info in argument_types:
 966             if info.arg_conv is not None:
 967                 out_c += ("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
 968         if return_type_info.ret_conv is not None:
 969             out_c += ("\t" + ret_conv_pfx.replace('\n', '\n\t'))
 970         elif return_type_info.c_ty != "void":
 971             out_c += ("\t" + return_type_info.c_ty + " ret_val = ")
 972         else:
 973             out_c += ("\t")
 974         if c_call_string is None:
 975             out_c += (method_name + "(")
 976         else:
 977             out_c += (c_call_string)
 978         for idx, info in enumerate(argument_types):
 979             if info.arg_conv_name is not None:
 980                 if idx != 0:
 981                     out_c += (", ")
 982                 elif c_call_string is not None:
 983                     continue
 984                 out_c += (info.arg_conv_name)
 985         out_c += (")")
 986         if return_type_info.ret_conv is not None:
 987             out_c += (ret_conv_sfx.replace('\n', '\n\t'))
 988         else:
 989             out_c += (";")
 990         for info in argument_types:
 991             if info.arg_conv_cleanup is not None:
 992                 out_c += ("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
 993         if return_type_info.ret_conv is not None:
 994             out_c += ("\n\treturn " + return_type_info.ret_conv_name + ";")
 995         elif return_type_info.c_ty != "void":
 996             out_c += ("\n\treturn ret_val;")
 997         out_c += ("\n}\n\n")
 998
 999         if args_known:
1000             out_java_struct += ("\t\t")
1001             if return_type_info.java_ty != "void":
1002                 out_java_struct += (return_type_info.java_ty + " ret = ")
1003             out_java_struct += ("bindings." + method_name + "(")
1004             for idx, info in enumerate(argument_types):
1005                 if idx != 0:
1006                     out_java_struct += (", ")
1007                 if idx == 0 and takes_self:
1008                     out_java_struct += ("this.ptr")
1009                 elif info.arg_name in default_constructor_args:
1010                     out_java_struct += ("bindings." + info.java_hu_ty + "_new(")
1011                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
1012                         if explode_idx != 0:
1013                             out_java_struct += (", ")
1014                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1015                         if explode_arg.from_hu_conv is not None:
1016                             out_java_struct += (
1017                                 explode_arg.from_hu_conv[0].replace(explode_arg.arg_name, expl_arg_name))
1018                         else:
1019                             out_java_struct += (expl_arg_name)
1020                     out_java_struct += (")")
1021                 elif info.from_hu_conv is not None:
1022                     out_java_struct += (info.from_hu_conv[0])
1023                 else:
1024                     out_java_struct += (info.arg_name)
1025             out_java_struct += (");\n")
1026             if return_type_info.to_hu_conv is not None:
1027                 if not takes_self:
1028                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t").replace("this",
1029                                                                                                                return_type_info.to_hu_conv_name) + "\n")
1030                 else:
1031                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t") + "\n")
1032
1033             for idx, info in enumerate(argument_types):
1034                 if idx == 0 and takes_self:
1035                     pass
1036                 elif info.arg_name in default_constructor_args:
1037                     for explode_arg in default_constructor_args[info.arg_name]:
1038                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1039                         if explode_arg.from_hu_conv is not None and return_type_info.to_hu_conv_name:
1040                             out_java_struct += ("\t\t" + explode_arg.from_hu_conv[1].replace(explode_arg.arg_name,
1041                                                                                                expl_arg_name).replace(
1042                                 "this", return_type_info.to_hu_conv_name) + ";\n")
1043                 elif info.from_hu_conv is not None and info.from_hu_conv[1] != "":
1044                     if not takes_self and return_type_info.to_hu_conv_name is not None:
1045                         out_java_struct += (
1046                             "\t\t" + info.from_hu_conv[1].replace("this", return_type_info.to_hu_conv_name).replace("\n", "\n\t\t") + ";\n")
1047                     else:
1048                         out_java_struct += ("\t\t" + info.from_hu_conv[1].replace("\n", "\n\t\t") + ";\n")
1049
1050             if return_type_info.to_hu_conv_name is not None:
1051                 out_java_struct += ("\t\treturn " + return_type_info.to_hu_conv_name + ";\n")
1052             elif return_type_info.java_ty != "void" and return_type_info.rust_obj != "LDK" + struct_meth:
1053                 out_java_struct += ("\t\treturn ret;\n")
1054             out_java_struct += ("\t}\n\n")
1055
1056         return (out_java, out_c, out_java_struct)