_ 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                 if (!get_lib_version_string().equals(get_ldk_java_bindings_version()))
  41                         throw new IllegalArgumentException("Compiled LDK library and LDK class failes do not match");
  42                 // Fetching the LDK versions from C also checks that the header and binaries match
  43                 get_ldk_c_bindings_version();
  44                 get_ldk_version();
  45         }
  46         static native void init(java.lang.Class c, java.lang.Class slicedef);
  47         static native void init_class_cache();
  48         static native String get_lib_version_string();
  49
  50         public static String get_ldk_java_bindings_version() {
  51                 return "<git_version_ldk_garbagecollected>";
  52         }
  53         public static native String get_ldk_c_bindings_version();
  54         public static native String get_ldk_version();
  55
  56         public static native boolean deref_bool(long ptr);
  57         public static native long deref_long(long ptr);
  58         public static native void free_heap_ptr(long ptr);
  59         public static native byte[] read_bytes(long ptr, long len);
  60         public static native byte[] get_u8_slice_bytes(long slice_ptr);
  61         public static native long bytes_to_u8_vec(byte[] bytes);
  62         public static native long new_txpointer_copy_data(byte[] txdata);
  63         public static native void txpointer_free(long ptr);
  64         public static native byte[] txpointer_get_buffer(long ptr);
  65         public static native long vec_slice_len(long vec);
  66         public static native long new_empty_slice_vec();
  67
  68 """
  69
  70         self.bindings_footer = "}\n"
  71
  72         self.util_fn_pfx = """package org.ldk.structs;
  73 import org.ldk.impl.bindings;
  74 import java.util.Arrays;
  75 import org.ldk.enums.*;
  76
  77 public class UtilMethods {
  78 """
  79         self.util_fn_sfx = "}"
  80         self.common_base = """package org.ldk.structs;
  81 import java.util.LinkedList;
  82 class CommonBase {
  83         long ptr;
  84         LinkedList<Object> ptrs_to = new LinkedList();
  85         protected CommonBase(long ptr) { this.ptr = ptr; }
  86         public long _test_only_get_ptr() { return this.ptr; }
  87 }
  88 """
  89
  90         self.c_file_pfx = """#include \"org_ldk_impl_bindings.h\"
  91 #include <lightning.h>
  92 #include <string.h>
  93 #include <stdatomic.h>
  94 #include <stdlib.h>
  95
  96 """
  97
  98         if self.target == Target.ANDROID:
  99             self.c_file_pfx = self.c_file_pfx + """
 100 #include <android/log.h>
 101 #define DEBUG_PRINT(...) __android_log_print(ANDROID_LOG_ERROR, "LDK", __VA_ARGS__)
 102
 103 #include <unistd.h>
 104 #include <pthread.h>
 105 static void* redirect_stderr(void* ignored) {
 106         int pipes[2];
 107         pipe(pipes);
 108         dup2(pipes[1], STDERR_FILENO);
 109         char buf[8192];
 110         memset(buf, 0, 8192);
 111         ssize_t len;
 112         while ((len = read(pipes[0], buf, 8191)) > 0) {
 113                 DEBUG_PRINT("%s\\n", buf);
 114                 memset(buf, 0, 8192);
 115         }
 116         DEBUG_PRINT("End of stderr???\\n");
 117         return 0;
 118 }
 119 void __attribute__((constructor)) spawn_stderr_redirection() {
 120         pthread_t thread;
 121         pthread_create(&thread, NULL, &redirect_stderr, NULL);
 122 }
 123 """
 124         else:
 125             self.c_file_pfx = self.c_file_pfx + "#define DEBUG_PRINT(...) fprintf(stderr, __VA_ARGS__)\n"
 126
 127         if not DEBUG:
 128             self.c_file_pfx = self.c_file_pfx + """#define MALLOC(a, _) malloc(a)
 129 #define FREE(p) if ((uint64_t)(p) > 1024) { free(p); }
 130 #define DO_ASSERT(a) (void)(a)
 131 #define CHECK(a)
 132 """
 133         else:
 134             self.c_file_pfx = self.c_file_pfx + """#include <assert.h>
 135 // Always run a, then assert it is true:
 136 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
 137 // Assert a is true or do nothing
 138 #define CHECK(a) DO_ASSERT(a)
 139
 140 void __attribute__((constructor)) debug_log_version() {
 141         if (check_get_ldk_version() == NULL)
 142                 DEBUG_PRINT("LDK version did not match the header we built against\\n");
 143         if (check_get_ldk_bindings_version() == NULL)
 144                 DEBUG_PRINT("LDK C Bindings version did not match the header we built against\\n");
 145         DEBUG_PRINT("Loaded LDK-Java Bindings with LDK %s and LDK-C-Bindings %s\\n", check_get_ldk_version(), check_get_ldk_bindings_version());
 146 }
 147
 148 // Running a leak check across all the allocations and frees of the JDK is a mess,
 149 // so instead we implement our own naive leak checker here, relying on the -wrap
 150 // linker option to wrap malloc/calloc/realloc/free, tracking everyhing allocated
 151 // and free'd in Rust or C across the generated bindings shared library.
 152 #include <threads.h>
 153 """
 154
 155             if self.target == Target.ANDROID:
 156                 self.c_file_pfx = self.c_file_pfx + """
 157 #include <unwind.h>
 158 #include <dlfcn.h>
 159
 160 // Implement the execinfo functions using _Unwind_backtrace. This seems to miss many Rust
 161 // symbols, so we only use it on Android, where execinfo.h is unavailable.
 162
 163 struct BacktraceState {
 164         void** current;
 165         void** end;
 166 };
 167 static _Unwind_Reason_Code unwind_callback(struct _Unwind_Context* context, void* arg) {
 168         struct BacktraceState* state = (struct BacktraceState*)arg;
 169         uintptr_t pc = _Unwind_GetIP(context);
 170         if (pc) {
 171                 if (state->current == state->end) {
 172                         return _URC_END_OF_STACK;
 173                 } else {
 174                         *state->current++ = (void*)(pc);
 175                 }
 176         }
 177         return _URC_NO_REASON;
 178 }
 179
 180 int backtrace(void** buffer, int max) {
 181         struct BacktraceState state = { buffer, buffer + max };
 182         _Unwind_Backtrace(unwind_callback, &state);
 183         return state.current - buffer;
 184 }
 185
 186 void backtrace_symbols_fd(void ** buffer, int count, int _fd) {
 187         for (int idx = 0; idx < count; ++idx) {
 188                 Dl_info info;
 189                 if (dladdr(buffer[idx], &info) && info.dli_sname) {
 190                         DEBUG_PRINT("%p: %s", buffer[idx], info.dli_sname);
 191                 } else {
 192                         DEBUG_PRINT("%p: ???", buffer[idx]);
 193                 }
 194         }
 195 }
 196 """
 197             else:
 198                 self.c_file_pfx = self.c_file_pfx + "#include <execinfo.h>\n"
 199             self.c_file_pfx = self.c_file_pfx + """
 200 #include <unistd.h>
 201 static mtx_t allocation_mtx;
 202
 203 void __attribute__((constructor)) init_mtx() {
 204         DO_ASSERT(mtx_init(&allocation_mtx, mtx_plain) == thrd_success);
 205 }
 206
 207 #define BT_MAX 128
 208 typedef struct allocation {
 209         struct allocation* next;
 210         void* ptr;
 211         const char* struct_name;
 212         void* bt[BT_MAX];
 213         int bt_len;
 214         unsigned long alloc_len;
 215 } allocation;
 216 static allocation* allocation_ll = NULL;
 217
 218 void* __real_malloc(size_t len);
 219 void* __real_calloc(size_t nmemb, size_t len);
 220 static void new_allocation(void* res, const char* struct_name, size_t len) {
 221         allocation* new_alloc = __real_malloc(sizeof(allocation));
 222         new_alloc->ptr = res;
 223         new_alloc->struct_name = struct_name;
 224         new_alloc->bt_len = backtrace(new_alloc->bt, BT_MAX);
 225         new_alloc->alloc_len = len;
 226         DO_ASSERT(mtx_lock(&allocation_mtx) == thrd_success);
 227         new_alloc->next = allocation_ll;
 228         allocation_ll = new_alloc;
 229         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
 230 }
 231 static void* MALLOC(size_t len, const char* struct_name) {
 232         void* res = __real_malloc(len);
 233         new_allocation(res, struct_name, len);
 234         return res;
 235 }
 236 void __real_free(void* ptr);
 237 static void alloc_freed(void* ptr) {
 238         allocation* p = NULL;
 239         DO_ASSERT(mtx_lock(&allocation_mtx) == thrd_success);
 240         allocation* it = allocation_ll;
 241         while (it->ptr != ptr) {
 242                 p = it; it = it->next;
 243                 if (it == NULL) {
 244                         DEBUG_PRINT("Tried to free unknown pointer %p at:\\n", ptr);
 245                         void* bt[BT_MAX];
 246                         int bt_len = backtrace(bt, BT_MAX);
 247                         backtrace_symbols_fd(bt, bt_len, STDERR_FILENO);
 248                         DEBUG_PRINT("\\n\\n");
 249                         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
 250                         return; // addrsan should catch malloc-unknown and print more info than we have
 251                 }
 252         }
 253         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
 254         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
 255         DO_ASSERT(it->ptr == ptr);
 256         __real_free(it);
 257 }
 258 static void FREE(void* ptr) {
 259         if ((uint64_t)ptr < 1024) return; // Rust loves to create pointers to the NULL page for dummys
 260         alloc_freed(ptr);
 261         __real_free(ptr);
 262 }
 263
 264 void* __wrap_malloc(size_t len) {
 265         void* res = __real_malloc(len);
 266         new_allocation(res, "malloc call", len);
 267         return res;
 268 }
 269 void* __wrap_calloc(size_t nmemb, size_t len) {
 270         void* res = __real_calloc(nmemb, len);
 271         new_allocation(res, "calloc call", len);
 272         return res;
 273 }
 274 void __wrap_free(void* ptr) {
 275         if (ptr == NULL) return;
 276         alloc_freed(ptr);
 277         __real_free(ptr);
 278 }
 279
 280 void* __real_realloc(void* ptr, size_t newlen);
 281 void* __wrap_realloc(void* ptr, size_t len) {
 282         if (ptr != NULL) alloc_freed(ptr);
 283         void* res = __real_realloc(ptr, len);
 284         new_allocation(res, "realloc call", len);
 285         return res;
 286 }
 287 void __wrap_reallocarray(void* ptr, size_t new_sz) {
 288         // Rust doesn't seem to use reallocarray currently
 289         DO_ASSERT(false);
 290 }
 291
 292 void __attribute__((destructor)) check_leaks() {
 293         unsigned long alloc_count = 0;
 294         unsigned long alloc_size = 0;
 295         DEBUG_PRINT("The following LDK-allocated blocks still remain.\\n");
 296         DEBUG_PRINT("Note that this is only accurate if System.gc(); System.runFinalization()\\n");
 297         DEBUG_PRINT("was called prior to exit after all LDK objects were out of scope.\\n");
 298         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 299                 DEBUG_PRINT("%s %p (%lu bytes) remains:\\n", a->struct_name, a->ptr, a->alloc_len);
 300                 backtrace_symbols_fd(a->bt, a->bt_len, STDERR_FILENO);
 301                 DEBUG_PRINT("\\n\\n");
 302                 alloc_count++;
 303                 alloc_size += a->alloc_len;
 304         }
 305         DEBUG_PRINT("%lu allocations remained for %lu bytes.\\n", alloc_count, alloc_size);
 306         DEBUG_PRINT("Note that this is only accurate if System.gc(); System.runFinalization()\\n");
 307         DEBUG_PRINT("was called prior to exit after all LDK objects were out of scope.\\n");
 308 }
 309 """
 310         self.c_file_pfx = self.c_file_pfx + """
 311 static jmethodID ordinal_meth = NULL;
 312 static jmethodID slicedef_meth = NULL;
 313 static jclass slicedef_cls = NULL;
 314 JNIEXPORT void Java_org_ldk_impl_bindings_init(JNIEnv * env, jclass _b, jclass enum_class, jclass slicedef_class) {
 315         ordinal_meth = (*env)->GetMethodID(env, enum_class, "ordinal", "()I");
 316         CHECK(ordinal_meth != NULL);
 317         slicedef_meth = (*env)->GetMethodID(env, slicedef_class, "<init>", "(JJJ)V");
 318         CHECK(slicedef_meth != NULL);
 319         slicedef_cls = (*env)->NewGlobalRef(env, slicedef_class);
 320         CHECK(slicedef_cls != NULL);
 321 }
 322
 323 JNIEXPORT jboolean JNICALL Java_org_ldk_impl_bindings_deref_1bool (JNIEnv * env, jclass _a, jlong ptr) {
 324         return *((bool*)ptr);
 325 }
 326 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_deref_1long (JNIEnv * env, jclass _a, jlong ptr) {
 327         return *((long*)ptr);
 328 }
 329 JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_free_1heap_1ptr (JNIEnv * env, jclass _a, jlong ptr) {
 330         FREE((void*)ptr);
 331 }
 332 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_read_1bytes (JNIEnv * env, jclass _b, jlong ptr, jlong len) {
 333         jbyteArray ret_arr = (*env)->NewByteArray(env, len);
 334         (*env)->SetByteArrayRegion(env, ret_arr, 0, len, (unsigned char*)ptr);
 335         return ret_arr;
 336 }
 337 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_get_1u8_1slice_1bytes (JNIEnv * env, jclass _b, jlong slice_ptr) {
 338         LDKu8slice *slice = (LDKu8slice*)slice_ptr;
 339         jbyteArray ret_arr = (*env)->NewByteArray(env, slice->datalen);
 340         (*env)->SetByteArrayRegion(env, ret_arr, 0, slice->datalen, slice->data);
 341         return ret_arr;
 342 }
 343 JNIEXPORT int64_t impl_bindings_bytes_1to_1u8_1vec (JNIEnv * env, jclass _b, jbyteArray bytes) {
 344         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "LDKCVec_u8");
 345         vec->datalen = (*env)->GetArrayLength(env, bytes);
 346         vec->data = (uint8_t*)MALLOC(vec->datalen, "LDKCVec_u8Z Bytes");
 347         (*env)->GetByteArrayRegion (env, bytes, 0, vec->datalen, vec->data);
 348         return (uint64_t)vec;
 349 }
 350 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_txpointer_1get_1buffer (JNIEnv * env, jclass _b, jlong ptr) {
 351         LDKTransaction *txdata = (LDKTransaction*)ptr;
 352         LDKu8slice slice;
 353         slice.data = txdata->data;
 354         slice.datalen = txdata->datalen;
 355         return Java_org_ldk_impl_bindings_get_1u8_1slice_1bytes(env, _b, (uint64_t)&slice);
 356 }
 357 JNIEXPORT int64_t JNICALL Java_org_ldk_impl_bindings_new_1txpointer_1copy_1data (JNIEnv * env, jclass _b, jbyteArray bytes) {
 358         LDKTransaction *txdata = (LDKTransaction*)MALLOC(sizeof(LDKTransaction), "LDKTransaction");
 359         txdata->datalen = (*env)->GetArrayLength(env, bytes);
 360         txdata->data = (uint8_t*)MALLOC(txdata->datalen, "Tx Data Bytes");
 361         txdata->data_is_owned = false;
 362         (*env)->GetByteArrayRegion (env, bytes, 0, txdata->datalen, txdata->data);
 363         return (uint64_t)txdata;
 364 }
 365 JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_txpointer_1free (JNIEnv * env, jclass _b, jlong ptr) {
 366         LDKTransaction *tx = (LDKTransaction*)ptr;
 367         tx->data_is_owned = true;
 368         Transaction_free(*tx);
 369         FREE((void*)ptr);
 370 }
 371 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_vec_1slice_1len (JNIEnv * env, jclass _a, jlong ptr) {
 372         // Check offsets of a few Vec types are all consistent as we're meant to be generic across types
 373         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_SignatureZ, datalen), "Vec<*> needs to be mapped identically");
 374         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_MessageSendEventZ, datalen), "Vec<*> needs to be mapped identically");
 375         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_EventZ, datalen), "Vec<*> needs to be mapped identically");
 376         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_C2Tuple_usizeTransactionZZ, datalen), "Vec<*> needs to be mapped identically");
 377         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)ptr;
 378         return (uint64_t)vec->datalen;
 379 }
 380 JNIEXPORT int64_t JNICALL Java_org_ldk_impl_bindings_new_1empty_1slice_1vec (JNIEnv * env, jclass _b) {
 381         // Check sizes of a few Vec types are all consistent as we're meant to be generic across types
 382         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_SignatureZ), "Vec<*> needs to be mapped identically");
 383         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_MessageSendEventZ), "Vec<*> needs to be mapped identically");
 384         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_EventZ), "Vec<*> needs to be mapped identically");
 385         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_C2Tuple_usizeTransactionZZ), "Vec<*> needs to be mapped identically");
 386         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "Empty LDKCVec");
 387         vec->data = NULL;
 388         vec->datalen = 0;
 389         return (uint64_t)vec;
 390 }
 391
 392 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
 393 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
 394 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
 395 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
 396
 397 _Static_assert(sizeof(jlong) == sizeof(int64_t), "We assume that j-types are the same as C types");
 398 _Static_assert(sizeof(jbyte) == sizeof(char), "We assume that j-types are the same as C types");
 399 _Static_assert(sizeof(void*) <= 8, "Pointers must fit into 64 bits");
 400
 401 typedef jlongArray int64_tArray;
 402 typedef jbyteArray int8_tArray;
 403
 404 static inline jstring str_ref_to_java(JNIEnv *env, const char* chars, size_t len) {
 405         // Sadly we need to create a temporary because Java can't accept a char* without a 0-terminator
 406         char* conv_buf = MALLOC(len + 1, "str conv buf");
 407         memcpy(conv_buf, chars, len);
 408         conv_buf[len] = 0;
 409         jstring ret = (*env)->NewStringUTF(env, conv_buf);
 410         FREE(conv_buf);
 411         return ret;
 412 }
 413 static inline LDKStr java_to_owned_str(JNIEnv *env, jstring str) {
 414         uint64_t str_len = (*env)->GetStringUTFLength(env, str);
 415         char* newchars = MALLOC(str_len + 1, "String chars");
 416         const char* jchars = (*env)->GetStringUTFChars(env, str, NULL);
 417         memcpy(newchars, jchars, str_len);
 418         newchars[str_len] = 0;
 419         (*env)->ReleaseStringUTFChars(env, str, jchars);
 420         LDKStr res = {
 421                 .chars = newchars,
 422                 .len = str_len,
 423                 .chars_is_owned = true
 424         };
 425         return res;
 426 }
 427
 428 JNIEXPORT jstring JNICALL Java_org_ldk_impl_bindings_get_1lib_1version_1string(JNIEnv *env, jclass _c) {
 429         return str_ref_to_java(env, "<git_version_ldk_garbagecollected>", strlen("<git_version_ldk_garbagecollected>"));
 430 }
 431 JNIEXPORT jstring JNICALL Java_org_ldk_impl_bindings_get_1ldk_1c_1bindings_1version(JNIEnv *env, jclass _c) {
 432         return str_ref_to_java(env, check_get_ldk_bindings_version(), strlen(check_get_ldk_bindings_version()));
 433 }
 434 JNIEXPORT jstring JNICALL Java_org_ldk_impl_bindings_get_1ldk_1version(JNIEnv *env, jclass _c) {
 435         return str_ref_to_java(env, check_get_ldk_version(), strlen(check_get_ldk_version()));
 436 }
 437 """
 438
 439         self.hu_struct_file_prefix = """package org.ldk.structs;
 440
 441 import org.ldk.impl.bindings;
 442 import org.ldk.enums.*;
 443 import org.ldk.util.*;
 444 import java.util.Arrays;
 445
 446 """
 447         self.c_fn_ty_pfx = "JNIEXPORT "
 448         self.c_fn_args_pfx = "JNIEnv *env, jclass clz"
 449         self.file_ext = ".java"
 450         self.ptr_c_ty = "int64_t"
 451         self.ptr_native_ty = "long"
 452         self.result_c_ty = "jclass"
 453         self.ptr_arr = "jobjectArray"
 454         self.get_native_arr_len_call = ("(*env)->GetArrayLength(env, ", ")")
 455
 456     def release_native_arr_ptr_call(self, ty_info, arr_var, arr_ptr_var):
 457         if ty_info.subty is None or not ty_info.subty.c_ty.endswith("Array"):
 458             return "(*env)->ReleasePrimitiveArrayCritical(env, " + arr_var + ", " + arr_ptr_var + ", 0)"
 459         return None
 460     def create_native_arr_call(self, arr_len, ty_info):
 461         if ty_info.c_ty == "int8_tArray":
 462             return "(*env)->NewByteArray(env, " + arr_len + ")"
 463         elif ty_info.subty.c_ty.endswith("Array"):
 464             clz_var = ty_info.java_fn_ty_arg[1:].replace("[", "arr_of_")
 465             self.c_array_class_caches.add(clz_var)
 466             return "(*env)->NewObjectArray(env, " + arr_len + ", " + clz_var + "_clz, NULL);\n"
 467         else:
 468             return "(*env)->New" + ty_info.java_ty.strip("[]").title() + "Array(env, " + arr_len + ")"
 469     def set_native_arr_contents(self, arr_name, arr_len, ty_info):
 470         if ty_info.c_ty == "int8_tArray":
 471             return ("(*env)->SetByteArrayRegion(env, " + arr_name + ", 0, " + arr_len + ", ", ")")
 472         else:
 473             assert False
 474     def get_native_arr_contents(self, arr_name, dest_name, arr_len, ty_info, copy):
 475         if ty_info.c_ty == "int8_tArray":
 476             if copy:
 477                 return "(*env)->GetByteArrayRegion(env, " + arr_name + ", 0, " + arr_len + ", " + dest_name + ")"
 478             else:
 479                 return "(*env)->GetByteArrayElements (env, " + arr_name + ", NULL)"
 480         elif not ty_info.java_ty[:len(ty_info.java_ty) - 2].endswith("[]"):
 481             return "(*env)->Get" + ty_info.subty.java_ty.title() + "ArrayElements (env, " + arr_name + ", NULL)"
 482         else:
 483             return None
 484     def get_native_arr_elem(self, arr_name, idxc, ty_info):
 485         if self.get_native_arr_contents(arr_name, "", "", ty_info, False) is None:
 486             return "(*env)->GetObjectArrayElement(env, " + arr_name + ", " + idxc + ")"
 487         else:
 488             assert False # Only called if above is None
 489     def get_native_arr_ptr_call(self, ty_info):
 490         if ty_info.subty is not None and ty_info.subty.c_ty.endswith("Array"):
 491             return None
 492         return ("(*env)->GetPrimitiveArrayCritical(env, ", ", NULL)")
 493     def get_native_arr_entry_call(self, ty_info, arr_name, idxc, entry_access):
 494         if ty_info.subty is None or not ty_info.subty.c_ty.endswith("Array"):
 495             return None
 496         return "(*env)->SetObjectArrayElement(env, " + arr_name + ", " + idxc + ", " + entry_access + ")"
 497     def cleanup_native_arr_ref_contents(self, arr_name, dest_name, arr_len, ty_info):
 498         if ty_info.c_ty == "int8_tArray":
 499             return "(*env)->ReleaseByteArrayElements(env, " + arr_name + ", (int8_t*)" + dest_name + ", 0);"
 500         else:
 501             return "(*env)->Release" + ty_info.java_ty.strip("[]").title() + "ArrayElements(env, " + arr_name + ", " + dest_name + ", 0)"
 502
 503     def str_ref_to_native_call(self, var_name, str_len):
 504         return "str_ref_to_java(env, " + var_name + ", " + str_len + ")"
 505     def str_ref_to_c_call(self, var_name):
 506         return "java_to_owned_str(env, " + var_name + ")"
 507
 508     def c_fn_name_define_pfx(self, fn_name, has_args):
 509         if has_args:
 510             return "JNICALL Java_org_ldk_impl_bindings_" + fn_name.replace("_", "_1") + "(JNIEnv *env, jclass clz, "
 511         return "JNICALL Java_org_ldk_impl_bindings_" + fn_name.replace("_", "_1") + "(JNIEnv *env, jclass clz"
 512
 513     def init_str(self):
 514         res = ""
 515         for ty in sorted(self.c_array_class_caches):
 516             res = res + "static jclass " + ty + "_clz = NULL;\n"
 517         res = res + "JNIEXPORT void Java_org_ldk_impl_bindings_init_1class_1cache(JNIEnv * env, jclass clz) {\n"
 518         for ty in sorted(self.c_array_class_caches):
 519             res = res + "\t" + ty + "_clz = (*env)->FindClass(env, \"" + ty.replace("arr_of_", "[") + "\");\n"
 520             res = res + "\tCHECK(" + ty + "_clz != NULL);\n"
 521             res = res + "\t" + ty + "_clz = (*env)->NewGlobalRef(env, " + ty + "_clz);\n"
 522         res = res + "}\n"
 523         return res
 524
 525     def native_c_unitary_enum_map(self, struct_name, variants, enum_doc_comment):
 526         out_java_enum = "package org.ldk.enums;\n\n"
 527         out_java = ""
 528         out_c = ""
 529         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_from_java(" + self.c_fn_args_pfx + ") {\n"
 530         out_c = out_c + "\tswitch ((*env)->CallIntMethod(env, clz, ordinal_meth)) {\n"
 531
 532         if enum_doc_comment is not None:
 533             out_java_enum += "/**\n * " + enum_doc_comment.replace("\n", "\n * ") + "\n */\n"
 534         out_java_enum += "public enum " + struct_name + " {\n"
 535         ord_v = 0
 536         for var in variants:
 537             out_java_enum = out_java_enum + "\t" + var + ",\n"
 538             out_c = out_c + "\t\tcase %d: return %s;\n" % (ord_v, var)
 539             ord_v = ord_v + 1
 540         out_java_enum = out_java_enum + "\t; static native void init();\n"
 541         out_java_enum = out_java_enum + "\tstatic { init(); }\n"
 542         out_java_enum = out_java_enum + "}"
 543         out_java = out_java + "\tstatic { " + struct_name + ".values(); /* Force enum statics to run */ }\n"
 544         out_c = out_c + "\t}\n"
 545         out_c = out_c + "\tabort();\n"
 546         out_c = out_c + "}\n"
 547
 548         out_c = out_c + "static jclass " + struct_name + "_class = NULL;\n"
 549         for var in variants:
 550             out_c = out_c + "static jfieldID " + struct_name + "_" + var + " = NULL;\n"
 551         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"
 552         out_c = out_c + "\t" + struct_name + "_class = (*env)->NewGlobalRef(env, clz);\n"
 553         out_c = out_c + "\tCHECK(" + struct_name + "_class != NULL);\n"
 554         for var in variants:
 555             out_c = out_c + "\t" + struct_name + "_" + var + " = (*env)->GetStaticFieldID(env, " + struct_name + "_class, \"" + var + "\", \"Lorg/ldk/enums/" + struct_name + ";\");\n"
 556             out_c = out_c + "\tCHECK(" + struct_name + "_" + var + " != NULL);\n"
 557         out_c = out_c + "}\n"
 558         out_c = out_c + "static inline jclass " + struct_name + "_to_java(JNIEnv *env, " + struct_name + " val) {\n"
 559         out_c = out_c + "\tswitch (val) {\n"
 560         ord_v = 0
 561         for var in variants:
 562             out_c = out_c + "\t\tcase " + var + ":\n"
 563             out_c = out_c + "\t\t\treturn (*env)->GetStaticObjectField(env, " + struct_name + "_class, " + struct_name + "_" + var + ");\n"
 564             ord_v = ord_v + 1
 565         out_c = out_c + "\t\tdefault: abort();\n"
 566         out_c = out_c + "\t}\n"
 567         out_c = out_c + "}\n\n"
 568
 569         return (out_c, out_java_enum, out_java)
 570
 571     def c_unitary_enum_to_native_call(self, ty_info):
 572         return (ty_info.rust_obj + "_to_java(env, ", ")")
 573     def native_unitary_enum_to_c_call(self, ty_info):
 574         return (ty_info.rust_obj + "_from_java(env, ", ")")
 575
 576     def c_complex_enum_pfx(self, struct_name, variants, init_meth_jty_strs):
 577         out_c = ""
 578         for var in variants:
 579             out_c = out_c + "static jclass " + struct_name + "_" + var + "_class = NULL;\n"
 580             out_c = out_c + "static jmethodID " + struct_name + "_" + var + "_meth = NULL;\n"
 581         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"
 582         for var_name in variants:
 583             out_c = out_c + "\t" + struct_name + "_" + var_name + "_class =\n"
 584             if self.target == Target.ANDROID:
 585                 out_c = out_c + "\t\t(*env)->NewGlobalRef(env, (*env)->FindClass(env, \"org/ldk/impl/bindings$" + struct_name + "$" + var_name + "\"));\n"
 586             else:
 587                 out_c = out_c + "\t\t(*env)->NewGlobalRef(env, (*env)->FindClass(env, \"Lorg/ldk/impl/bindings$" + struct_name + "$" + var_name + ";\"));\n"
 588             out_c = out_c + "\tCHECK(" + struct_name + "_" + var_name + "_class != NULL);\n"
 589             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"
 590             out_c = out_c + "\tCHECK(" + struct_name + "_" + var_name + "_meth != NULL);\n"
 591         out_c = out_c + "}\n"
 592         return out_c
 593
 594     def c_complex_enum_pass_ty(self, struct_name):
 595         return "jobject"
 596
 597     def c_constr_native_complex_enum(self, struct_name, variant, c_params):
 598         ret = "(*env)->NewObject(env, " + struct_name + "_" + variant + "_class, " + struct_name + "_" + variant + "_meth"
 599         for param in c_params:
 600             ret = ret + ", " + param
 601         return ret + ")"
 602
 603     def native_c_map_trait(self, struct_name, field_vars, flattened_field_vars, field_fns, trait_doc_comment):
 604         out_java_trait = ""
 605         out_java = ""
 606
 607         # First generate most of the Java code, note that we need information about java method argument strings for C
 608         out_java_trait = out_java_trait + self.hu_struct_file_prefix
 609         if trait_doc_comment is not None:
 610             out_java_trait += "/**\n * " + trait_doc_comment.replace("\n", "\n * ") + "\n */\n"
 611         out_java_trait += "@SuppressWarnings(\"unchecked\") // We correctly assign various generic arrays\n"
 612         out_java_trait = out_java_trait + "public class " + struct_name.replace("LDK","") + " extends CommonBase {\n"
 613         out_java_trait = out_java_trait + "\tfinal bindings." + struct_name + " bindings_instance;\n"
 614         out_java_trait = out_java_trait + "\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); bindings_instance = null; }\n"
 615         out_java_trait = out_java_trait + "\tprivate " + struct_name.replace("LDK", "") + "(bindings." + struct_name + " arg"
 616         for var in flattened_field_vars:
 617             if isinstance(var, ConvInfo):
 618                 out_java_trait = out_java_trait + ", " + var.java_hu_ty + " " + var.arg_name
 619             else:
 620                 out_java_trait = out_java_trait + ", bindings." + var[0] + " " + var[1]
 621         out_java_trait = out_java_trait + ") {\n"
 622         out_java_trait = out_java_trait + "\t\tsuper(bindings." + struct_name + "_new(arg"
 623         for var in flattened_field_vars:
 624             if isinstance(var, ConvInfo):
 625                 if var.from_hu_conv is not None:
 626                     out_java_trait = out_java_trait + ", " + var.from_hu_conv[0]
 627                 else:
 628                     out_java_trait = out_java_trait + ", " + var.arg_name
 629             else:
 630                 out_java_trait = out_java_trait + ", " + var[1]
 631         out_java_trait = out_java_trait + "));\n"
 632         out_java_trait = out_java_trait + "\t\tthis.ptrs_to.add(arg);\n"
 633         for var in flattened_field_vars:
 634             if isinstance(var, ConvInfo):
 635                 if var.from_hu_conv is not None and var.from_hu_conv[1] != "":
 636                     out_java_trait = out_java_trait + "\t\t" + var.from_hu_conv[1].replace("\n", "\n\t\t") + ";\n"
 637             else:
 638                 out_java_trait = out_java_trait + "\t\tthis.ptrs_to.add(" + var[1] + ");\n"
 639         out_java_trait = out_java_trait + "\t\tthis.bindings_instance = arg;\n"
 640         out_java_trait = out_java_trait + "\t}\n"
 641         out_java_trait = out_java_trait + "\t@Override @SuppressWarnings(\"deprecation\")\n"
 642         out_java_trait = out_java_trait + "\tprotected void finalize() throws Throwable {\n"
 643         out_java_trait = out_java_trait + "\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); } super.finalize();\n"
 644         out_java_trait = out_java_trait + "\t}\n\n"
 645
 646         java_trait_constr = "\tprivate static class " + struct_name + "Holder { " + struct_name.replace("LDK", "") + " held; }\n"
 647         java_trait_constr = java_trait_constr + "\tpublic static " + struct_name.replace("LDK", "") + " new_impl(" + struct_name.replace("LDK", "") + "Interface arg"
 648         for var in flattened_field_vars:
 649             if isinstance(var, ConvInfo):
 650                 java_trait_constr = java_trait_constr + ", " + var.java_hu_ty + " " + var.arg_name
 651             else:
 652                 # Ideally we'd be able to take any instance of the interface, but our C code can only represent
 653                 # Java-implemented version, so we require users pass a Java implementation here :/
 654                 java_trait_constr = java_trait_constr + ", " + var[0].replace("LDK", "") + "." + var[0].replace("LDK", "") + "Interface " + var[1] + "_impl"
 655         java_trait_constr = java_trait_constr + ") {\n\t\tfinal " + struct_name + "Holder impl_holder = new " + struct_name + "Holder();\n"
 656         java_trait_constr = java_trait_constr + "\t\timpl_holder.held = new " + struct_name.replace("LDK", "") + "(new bindings." + struct_name + "() {\n"
 657         out_java_trait = out_java_trait + "\tpublic static interface " + struct_name.replace("LDK", "") + "Interface {\n"
 658         out_java = out_java + "\tpublic interface " + struct_name + " {\n"
 659         java_meths = []
 660         for fn_line in field_fns:
 661             java_meth_descr = "("
 662             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 663                 out_java = out_java + "\t\t " + fn_line.ret_ty_info.java_ty + " " + fn_line.fn_name + "("
 664                 java_trait_constr = java_trait_constr + "\t\t\t@Override public " + fn_line.ret_ty_info.java_ty + " " + fn_line.fn_name + "("
 665                 out_java_trait += "\t\t/**\n\t\t * " + fn_line.docs.replace("\n", "\n\t\t * ") + "\n\t\t */\n"
 666                 out_java_trait = out_java_trait + "\t\t" + fn_line.ret_ty_info.java_hu_ty + " " + fn_line.fn_name + "("
 667
 668                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 669                     if idx >= 1:
 670                         out_java = out_java + ", "
 671                         java_trait_constr = java_trait_constr + ", "
 672                         out_java_trait = out_java_trait + ", "
 673                     out_java = out_java + arg_conv_info.java_ty + " " + arg_conv_info.arg_name
 674                     out_java_trait = out_java_trait + arg_conv_info.java_hu_ty + " " + arg_conv_info.arg_name
 675                     java_trait_constr = java_trait_constr + arg_conv_info.java_ty + " " + arg_conv_info.arg_name
 676                     java_meth_descr = java_meth_descr + arg_conv_info.java_fn_ty_arg
 677                 java_meth_descr = java_meth_descr + ")" + fn_line.ret_ty_info.java_fn_ty_arg
 678                 java_meths.append((fn_line.fn_name, java_meth_descr))
 679
 680                 out_java = out_java + ");\n"
 681                 out_java_trait = out_java_trait + ");\n"
 682                 java_trait_constr = java_trait_constr + ") {\n"
 683
 684                 for arg_info in fn_line.args_ty:
 685                     if arg_info.to_hu_conv is not None:
 686                         java_trait_constr = java_trait_constr + "\t\t\t\t" + arg_info.to_hu_conv.replace("\n", "\n\t\t\t\t") + "\n"
 687
 688                 if fn_line.ret_ty_info.java_ty != "void":
 689                     java_trait_constr = java_trait_constr + "\t\t\t\t" + fn_line.ret_ty_info.java_hu_ty + " ret = arg." + fn_line.fn_name + "("
 690                 else:
 691                     java_trait_constr = java_trait_constr + "\t\t\t\targ." + fn_line.fn_name + "("
 692
 693                 for idx, arg_info in enumerate(fn_line.args_ty):
 694                     if idx != 0:
 695                         java_trait_constr = java_trait_constr + ", "
 696                     if arg_info.to_hu_conv_name is not None:
 697                         java_trait_constr = java_trait_constr + arg_info.to_hu_conv_name
 698                     else:
 699                         java_trait_constr = java_trait_constr + arg_info.arg_name
 700
 701                 java_trait_constr = java_trait_constr + ");\n"
 702                 if fn_line.ret_ty_info.java_ty != "void":
 703                     if fn_line.ret_ty_info.from_hu_conv is not None:
 704                         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"
 705                         if fn_line.ret_ty_info.from_hu_conv[1] != "":
 706                             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"
 707                         #if fn_line.ret_ty_info.rust_obj in result_types:
 708                         java_trait_constr = java_trait_constr + "\t\t\t\treturn result;\n"
 709                     else:
 710                         java_trait_constr = java_trait_constr + "\t\t\t\treturn ret;\n"
 711                 java_trait_constr = java_trait_constr + "\t\t\t}\n"
 712         java_trait_constr = java_trait_constr + "\t\t}"
 713         for var in field_vars:
 714             if isinstance(var, ConvInfo):
 715                 java_trait_constr = java_trait_constr + ", " + var.arg_name
 716             else:
 717                 java_trait_constr += ", " + var[1] + ".new_impl(" + var[1] + "_impl"
 718                 for suparg in var[2]:
 719                     if isinstance(suparg, ConvInfo):
 720                         java_trait_constr += ", " + suparg.arg_name
 721                     else:
 722                         java_trait_constr += ", " + suparg[1]
 723                 java_trait_constr += ").bindings_instance"
 724                 for suparg in var[2]:
 725                     if isinstance(suparg, ConvInfo):
 726                         java_trait_constr += ", " + suparg.arg_name
 727                     else:
 728                         java_trait_constr += ", " + suparg[1]
 729         out_java_trait = out_java_trait + "\t}\n"
 730         out_java_trait = out_java_trait + java_trait_constr + ");\n\t\treturn impl_holder.held;\n\t}\n"
 731
 732         out_java = out_java + "\t}\n"
 733
 734         out_java = out_java + "\tpublic static native long " + struct_name + "_new(" + struct_name + " impl"
 735         for var in flattened_field_vars:
 736             if isinstance(var, ConvInfo):
 737                 out_java = out_java + ", " + var.java_ty + " " + var.arg_name
 738             else:
 739                 out_java = out_java + ", " + var[0] + " " + var[1]
 740         out_java = out_java + ");\n"
 741
 742         # Now that we've written out our java code (and created java_meths), generate C
 743         out_c = "typedef struct " + struct_name + "_JCalls {\n"
 744         out_c = out_c + "\tatomic_size_t refcnt;\n"
 745         out_c = out_c + "\tJavaVM *vm;\n"
 746         out_c = out_c + "\tjweak o;\n"
 747         for var in flattened_field_vars:
 748             if isinstance(var, ConvInfo):
 749                 # We're a regular ol' field
 750                 pass
 751             else:
 752                 # We're a supertrait
 753                 out_c = out_c + "\t" + var[0] + "_JCalls* " + var[1] + ";\n"
 754         for fn in field_fns:
 755             if fn.fn_name != "free" and fn.fn_name != "clone":
 756                 out_c = out_c + "\tjmethodID " + fn.fn_name + "_meth;\n"
 757         out_c = out_c + "} " + struct_name + "_JCalls;\n"
 758
 759         for fn_line in field_fns:
 760             if fn_line.fn_name == "free":
 761                 out_c = out_c + "static void " + struct_name + "_JCalls_free(void* this_arg) {\n"
 762                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 763                 out_c = out_c + "\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n"
 764                 out_c = out_c + "\t\tJNIEnv *env;\n"
 765                 out_c = out_c + "\t\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_6) == JNI_OK);\n"
 766                 out_c = out_c + "\t\t(*env)->DeleteWeakGlobalRef(env, j_calls->o);\n"
 767                 out_c = out_c + "\t\tFREE(j_calls);\n"
 768                 out_c = out_c + "\t}\n}\n"
 769
 770         for idx, fn_line in enumerate(field_fns):
 771             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 772                 assert fn_line.ret_ty_info.ty_info.get_full_rust_ty()[1] == ""
 773                 out_c = out_c + fn_line.ret_ty_info.ty_info.get_full_rust_ty()[0] + " " + fn_line.fn_name + "_" + struct_name + "_jcall("
 774                 if fn_line.self_is_const:
 775                     out_c = out_c + "const void* this_arg"
 776                 else:
 777                     out_c = out_c + "void* this_arg"
 778
 779                 for idx, arg in enumerate(fn_line.args_ty):
 780                     out_c = out_c + ", " + arg.ty_info.get_full_rust_ty()[0] + " " + arg.arg_name + arg.ty_info.get_full_rust_ty()[1]
 781
 782                 out_c = out_c + ") {\n"
 783                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 784                 out_c = out_c + "\tJNIEnv *env;\n"
 785                 out_c = out_c + "\tDO_ASSERT((*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_6) == JNI_OK);\n"
 786
 787                 for arg_info in fn_line.args_ty:
 788                     if arg_info.ret_conv is not None:
 789                         out_c = out_c + "\t" + arg_info.ret_conv[0].replace('\n', '\n\t')
 790                         out_c = out_c + arg_info.arg_name
 791                         out_c = out_c + arg_info.ret_conv[1].replace('\n', '\n\t') + "\n"
 792
 793                 out_c = out_c + "\tjobject obj = (*env)->NewLocalRef(env, j_calls->o);\n\tCHECK(obj != NULL);\n"
 794                 if fn_line.ret_ty_info.c_ty.endswith("Array"):
 795                     out_c = out_c + "\t" + fn_line.ret_ty_info.c_ty + " ret = (*env)->CallObjectMethod(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 796                 elif not fn_line.ret_ty_info.passed_as_ptr:
 797                     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"
 798                 else:
 799                     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"
 800
 801                 for idx, arg_info in enumerate(fn_line.args_ty):
 802                     if arg_info.ret_conv is not None:
 803                         out_c = out_c + ", " + arg_info.ret_conv_name
 804                     else:
 805                         out_c = out_c + ", " + arg_info.arg_name
 806                 out_c = out_c + ");\n"
 807                 if fn_line.ret_ty_info.arg_conv is not None:
 808                     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"
 809
 810                 out_c = out_c + "}\n"
 811
 812         # Write out a clone function whether we need one or not, as we use them in moving to rust
 813         out_c = out_c + "static void* " + struct_name + "_JCalls_clone(const void* this_arg) {\n"
 814         out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 815         out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n"
 816         for var in field_vars:
 817             if not isinstance(var, ConvInfo):
 818                 out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->" + var[1] + "->refcnt, 1, memory_order_release);\n"
 819         out_c = out_c + "\treturn (void*) this_arg;\n"
 820         out_c = out_c + "}\n"
 821
 822         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_init (" + self.c_fn_args_pfx + ", jobject o"
 823         for var in flattened_field_vars:
 824             if isinstance(var, ConvInfo):
 825                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 826             else:
 827                 out_c = out_c + ", jobject " + var[1]
 828         out_c = out_c + ") {\n"
 829
 830         out_c = out_c + "\tjclass c = (*env)->GetObjectClass(env, o);\n"
 831         out_c = out_c + "\tCHECK(c != NULL);\n"
 832         out_c = out_c + "\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n"
 833         out_c = out_c + "\tatomic_init(&calls->refcnt, 1);\n"
 834         out_c = out_c + "\tDO_ASSERT((*env)->GetJavaVM(env, &calls->vm) == 0);\n"
 835         out_c = out_c + "\tcalls->o = (*env)->NewWeakGlobalRef(env, o);\n"
 836
 837         for (fn_name, java_meth_descr) in java_meths:
 838             if fn_name != "free" and fn_name != "clone":
 839                 out_c = out_c + "\tcalls->" + fn_name + "_meth = (*env)->GetMethodID(env, c, \"" + fn_name + "\", \"" + java_meth_descr + "\");\n"
 840                 out_c = out_c + "\tCHECK(calls->" + fn_name + "_meth != NULL);\n"
 841
 842         for var in flattened_field_vars:
 843             if isinstance(var, ConvInfo) and var.arg_conv is not None:
 844                 out_c = out_c + "\n\t" + var.arg_conv.replace("\n", "\n\t") +"\n"
 845         out_c = out_c + "\n\t" + struct_name + " ret = {\n"
 846         out_c = out_c + "\t\t.this_arg = (void*) calls,\n"
 847         for fn_line in field_fns:
 848             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 849                 out_c = out_c + "\t\t." + fn_line.fn_name + " = " + fn_line.fn_name + "_" + struct_name + "_jcall,\n"
 850             elif fn_line.fn_name == "free":
 851                 out_c = out_c + "\t\t.free = " + struct_name + "_JCalls_free,\n"
 852             else:
 853                 out_c = out_c + "\t\t.clone = " + struct_name + "_JCalls_clone,\n"
 854         for var in field_vars:
 855             if isinstance(var, ConvInfo):
 856                 if var.arg_conv_name is not None:
 857                     out_c = out_c + "\t\t." + var.arg_name + " = " + var.arg_conv_name + ",\n"
 858                     out_c = out_c + "\t\t.set_" + var.arg_name + " = NULL,\n"
 859                 else:
 860                     out_c = out_c + "\t\t." + var.var_name + " = " + var.var_name + ",\n"
 861                     out_c = out_c + "\t\t.set_" + var.var_name + " = NULL,\n"
 862             else:
 863                 out_c += "\t\t." + var[1] + " = " + var[0] + "_init(env, clz, " + var[1]
 864                 for suparg in var[2]:
 865                     if isinstance(suparg, ConvInfo):
 866                         out_c = out_c + ", " + suparg.arg_name
 867                     else:
 868                         out_c = out_c + ", " + suparg[1]
 869                 out_c += "),\n"
 870         out_c = out_c + "\t};\n"
 871         for var in flattened_field_vars:
 872             if not isinstance(var, ConvInfo):
 873                 out_c = out_c + "\tcalls->" + var[1] + " = ret." + var[1] + ".this_arg;\n"
 874         out_c = out_c + "\treturn ret;\n"
 875         out_c = out_c + "}\n"
 876
 877         out_c = out_c + self.c_fn_ty_pfx + "int64_t " + self.c_fn_name_define_pfx(struct_name + "_new", True) + "jobject o"
 878         for var in flattened_field_vars:
 879             if isinstance(var, ConvInfo):
 880                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 881             else:
 882                 out_c = out_c + ", jobject " + var[1]
 883         out_c = out_c + ") {\n"
 884         out_c = out_c + "\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n"
 885         out_c = out_c + "\t*res_ptr = " + struct_name + "_init(env, clz, o"
 886         for var in flattened_field_vars:
 887             if isinstance(var, ConvInfo):
 888                 out_c = out_c + ", " + var.arg_name
 889             else:
 890                 out_c = out_c + ", " + var[1]
 891         out_c = out_c + ");\n"
 892         out_c = out_c + "\treturn (uint64_t)res_ptr;\n"
 893         out_c = out_c + "}\n"
 894
 895         return (out_java, out_java_trait, out_c)
 896
 897     def trait_struct_inc_refcnt(self, ty_info):
 898         base_conv = "\nif (" + ty_info.var_name + "_conv.free == " + ty_info.rust_obj + "_JCalls_free) {\n"
 899         base_conv = base_conv + "\t// If this_arg is a JCalls struct, then we need to increment the refcnt in it.\n"
 900         base_conv = base_conv + "\t" + ty_info.rust_obj + "_JCalls_clone(" + ty_info.var_name + "_conv.this_arg);\n}"
 901         return base_conv
 902
 903     def map_complex_enum(self, struct_name, variant_list, camel_to_snake, enum_doc_comment):
 904         java_hu_type = struct_name.replace("LDK", "").replace("COption", "Option")
 905         out_java_enum = ""
 906         out_java = ""
 907         out_c = ""
 908
 909         out_java_enum += (self.hu_struct_file_prefix)
 910         out_java_enum += "\n/**\n * " + enum_doc_comment.replace("\n", "\n * ") + "\n */\n"
 911         out_java_enum += "@SuppressWarnings(\"unchecked\") // We correctly assign various generic arrays\n"
 912         out_java_enum += ("public class " + java_hu_type + " extends CommonBase {\n")
 913         out_java_enum += ("\tprivate " + java_hu_type + "(Object _dummy, long ptr) { super(ptr); }\n")
 914         out_java_enum += ("\t@Override @SuppressWarnings(\"deprecation\")\n")
 915         out_java_enum += ("\tprotected void finalize() throws Throwable {\n")
 916         out_java_enum += ("\t\tsuper.finalize();\n")
 917         out_java_enum += ("\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK", "") + "_free(ptr); }\n")
 918         out_java_enum += ("\t}\n")
 919         out_java_enum += ("\tstatic " + java_hu_type + " constr_from_ptr(long ptr) {\n")
 920         out_java_enum += ("\t\tbindings." + struct_name + " raw_val = bindings." + struct_name + "_ref_from_ptr(ptr);\n")
 921         java_hu_subclasses = ""
 922
 923         init_meth_jty_strs = {}
 924
 925         out_java +=  ("\tpublic static class " + struct_name + " {\n")
 926         out_java +=  ("\t\tprivate " + struct_name + "() {}\n")
 927         for var in variant_list:
 928             out_java +=  ("\t\tpublic final static class " + var.var_name + " extends " + struct_name + " {\n")
 929             java_hu_subclasses = java_hu_subclasses + "\tpublic final static class " + var.var_name + " extends " + java_hu_type + " {\n"
 930             out_java_enum += ("\t\tif (raw_val.getClass() == bindings." + struct_name + "." + var.var_name + ".class) {\n")
 931             out_java_enum += ("\t\t\treturn new " + var.var_name + "(ptr, (bindings." + struct_name + "." + var.var_name + ")raw_val);\n")
 932             init_meth_jty_str = ""
 933             init_meth_params = ""
 934             init_meth_body = ""
 935             hu_conv_body = ""
 936             for idx, field_ty in enumerate(var.fields):
 937                 out_java += ("\t\t\tpublic " + field_ty.java_ty + " " + field_ty.arg_name + ";\n")
 938                 java_hu_subclasses = java_hu_subclasses + "\t\tpublic final " + field_ty.java_hu_ty + " " + field_ty.arg_name + ";\n"
 939                 if field_ty.to_hu_conv is not None:
 940                     hu_conv_body = hu_conv_body + "\t\t\t" + field_ty.java_ty + " " + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
 941                     hu_conv_body = hu_conv_body + "\t\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
 942                     hu_conv_body = hu_conv_body + "\t\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
 943                 else:
 944                     hu_conv_body = hu_conv_body + "\t\t\tthis." + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
 945                 init_meth_jty_str = init_meth_jty_str + field_ty.java_fn_ty_arg
 946                 if idx > 0:
 947                     init_meth_params = init_meth_params + ", "
 948                 init_meth_params = init_meth_params + field_ty.java_ty + " " + field_ty.arg_name
 949                 init_meth_body = init_meth_body + "this." + field_ty.arg_name + " = " + field_ty.arg_name + "; "
 950             out_java +=  ("\t\t\t" + var.var_name + "(" + init_meth_params + ") { ")
 951             out_java +=  (init_meth_body)
 952             out_java +=  ("}\n")
 953             out_java += ("\t\t}\n")
 954             out_java_enum += ("\t\t}\n")
 955             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"
 956             java_hu_subclasses = java_hu_subclasses + hu_conv_body
 957             java_hu_subclasses = java_hu_subclasses + "\t\t}\n\t}\n"
 958             init_meth_jty_strs[var.var_name] = init_meth_jty_str
 959         out_java += ("\t\tstatic native void init();\n")
 960         out_java += ("\t}\n")
 961         out_java_enum += ("\t\tassert false; return null; // Unreachable without extending the (internal) bindings interface\n\t}\n\n")
 962         out_java_enum += (java_hu_subclasses)
 963         out_java += ("\tstatic { " + struct_name + ".init(); }\n")
 964         out_java += ("\tpublic static native " + struct_name + " " + struct_name + "_ref_from_ptr(long ptr);\n");
 965
 966         out_c += (self.c_complex_enum_pfx(struct_name, [x.var_name for x in variant_list], init_meth_jty_strs))
 967
 968         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")
 969         out_c += ("\t" + struct_name + " *obj = (" + struct_name + "*)(ptr & ~1);\n")
 970         out_c += ("\tswitch(obj->tag) {\n")
 971         for var in variant_list:
 972             out_c += ("\t\tcase " + struct_name + "_" + var.var_name + ": {\n")
 973             c_params = []
 974             for idx, field_map in enumerate(var.fields):
 975                 if field_map.ret_conv is not None:
 976                     out_c += ("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
 977                     if var.tuple_variant:
 978                         out_c += "obj->" + camel_to_snake(var.var_name)
 979                     else:
 980                         out_c += "obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name
 981                     out_c += (field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
 982                     c_params.append(field_map.ret_conv_name)
 983                 else:
 984                     if var.tuple_variant:
 985                         c_params.append("obj->" + camel_to_snake(var.var_name))
 986                     else:
 987                         c_params.append("obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name)
 988             out_c += ("\t\t\treturn " + self.c_constr_native_complex_enum(struct_name, var.var_name, c_params) + ";\n")
 989             out_c += ("\t\t}\n")
 990         out_c += ("\t\tdefault: abort();\n")
 991         out_c += ("\t}\n}\n")
 992         return (out_java, out_java_enum, out_c)
 993
 994     def map_opaque_struct(self, struct_name, struct_doc_comment):
 995         out_opaque_struct_human = ""
 996         out_opaque_struct_human += self.hu_struct_file_prefix
 997         out_opaque_struct_human += "\n/**\n * " + struct_doc_comment.replace("\n", "\n * ") + "\n */\n"
 998         out_opaque_struct_human += "@SuppressWarnings(\"unchecked\") // We correctly assign various generic arrays\n"
 999         out_opaque_struct_human += ("public class " + struct_name.replace("LDK","") + " extends CommonBase")
1000         if struct_name.startswith("LDKLocked"):
1001             out_opaque_struct_human += (" implements AutoCloseable")
1002         out_opaque_struct_human += (" {\n")
1003         out_opaque_struct_human += ("\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); }\n")
1004         if struct_name.startswith("LDKLocked"):
1005             out_opaque_struct_human += ("\t@Override public void close() {\n")
1006         else:
1007             out_opaque_struct_human += ("\t@Override @SuppressWarnings(\"deprecation\")\n")
1008             out_opaque_struct_human += ("\tprotected void finalize() throws Throwable {\n")
1009             out_opaque_struct_human += ("\t\tsuper.finalize();\n")
1010         out_opaque_struct_human += ("\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); }\n")
1011         out_opaque_struct_human += ("\t}\n\n")
1012         return out_opaque_struct_human
1013
1014
1015     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):
1016         out_java = ""
1017         out_c = ""
1018         out_java_struct = None
1019
1020         out_java += ("\tpublic static native ")
1021         out_c += (self.c_fn_ty_pfx)
1022         out_c += (return_type_info.c_ty)
1023         out_java += (return_type_info.java_ty)
1024         if return_type_info.ret_conv is not None:
1025             ret_conv_pfx, ret_conv_sfx = return_type_info.ret_conv
1026         out_java += (" " + method_name + "(")
1027         have_args = len(argument_types) > 1 or (len(argument_types) > 0 and argument_types[0].c_ty != "void")
1028         out_c += (" " + self.c_fn_name_define_pfx(method_name, have_args))
1029
1030         for idx, arg_conv_info in enumerate(argument_types):
1031             if idx != 0:
1032                 out_java += (", ")
1033                 out_c += (", ")
1034             if arg_conv_info.c_ty != "void":
1035                 out_c += (arg_conv_info.c_ty + " " + arg_conv_info.arg_name)
1036                 out_java += (arg_conv_info.java_ty + " " + arg_conv_info.arg_name)
1037
1038         out_java_struct = ""
1039         if not args_known:
1040             out_java_struct += ("\t// Skipped " + method_name + "\n")
1041         else:
1042             meth_n = method_name[len(struct_meth) + 1:].strip("_")
1043             if doc_comment is not None:
1044                 out_java_struct += "\t/**\n\t * " + doc_comment.replace("\n", "\n\t * ") + "\n\t */\n"
1045             if not takes_self:
1046                 out_java_struct += (
1047                     "\tpublic static " + return_type_info.java_hu_ty + " constructor_" + meth_n + "(")
1048             else:
1049                 out_java_struct += ("\tpublic " + return_type_info.java_hu_ty + " " + meth_n + "(")
1050             for idx, arg in enumerate(argument_types):
1051                 if idx != 0:
1052                     if not takes_self or idx > 1:
1053                         out_java_struct += (", ")
1054                 elif takes_self:
1055                     continue
1056                 if arg.java_ty != "void":
1057                     if arg.arg_name in default_constructor_args:
1058                         for explode_idx, explode_arg in enumerate(default_constructor_args[arg.arg_name]):
1059                             if explode_idx != 0:
1060                                 out_java_struct += (", ")
1061                             out_java_struct += (
1062                                 explode_arg.java_hu_ty + " " + arg.arg_name + "_" + explode_arg.arg_name)
1063                     else:
1064                         out_java_struct += (arg.java_hu_ty + " " + arg.arg_name)
1065         out_java += (");\n")
1066         out_c += (") {\n")
1067         if out_java_struct is not None:
1068             out_java_struct += (") {\n")
1069         for info in argument_types:
1070             if info.arg_conv is not None:
1071                 out_c += ("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
1072         if return_type_info.ret_conv is not None:
1073             out_c += ("\t" + ret_conv_pfx.replace('\n', '\n\t'))
1074         elif return_type_info.c_ty != "void":
1075             out_c += ("\t" + return_type_info.c_ty + " ret_val = ")
1076         else:
1077             out_c += ("\t")
1078         if c_call_string is None:
1079             out_c += (method_name + "(")
1080         else:
1081             out_c += (c_call_string)
1082         for idx, info in enumerate(argument_types):
1083             if info.arg_conv_name is not None:
1084                 if idx != 0:
1085                     out_c += (", ")
1086                 elif c_call_string is not None:
1087                     continue
1088                 out_c += (info.arg_conv_name)
1089         out_c += (")")
1090         if return_type_info.ret_conv is not None:
1091             out_c += (ret_conv_sfx.replace('\n', '\n\t'))
1092         else:
1093             out_c += (";")
1094         for info in argument_types:
1095             if info.arg_conv_cleanup is not None:
1096                 out_c += ("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
1097         if return_type_info.ret_conv is not None:
1098             out_c += ("\n\treturn " + return_type_info.ret_conv_name + ";")
1099         elif return_type_info.c_ty != "void":
1100             out_c += ("\n\treturn ret_val;")
1101         out_c += ("\n}\n\n")
1102
1103         if args_known:
1104             out_java_struct += ("\t\t")
1105             if return_type_info.java_ty != "void":
1106                 out_java_struct += (return_type_info.java_ty + " ret = ")
1107             out_java_struct += ("bindings." + method_name + "(")
1108             for idx, info in enumerate(argument_types):
1109                 if idx != 0:
1110                     out_java_struct += (", ")
1111                 if idx == 0 and takes_self:
1112                     out_java_struct += ("this.ptr")
1113                 elif info.arg_name in default_constructor_args:
1114                     out_java_struct += ("bindings." + info.java_hu_ty + "_new(")
1115                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
1116                         if explode_idx != 0:
1117                             out_java_struct += (", ")
1118                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1119                         if explode_arg.from_hu_conv is not None:
1120                             out_java_struct += (
1121                                 explode_arg.from_hu_conv[0].replace(explode_arg.arg_name, expl_arg_name))
1122                         else:
1123                             out_java_struct += (expl_arg_name)
1124                     out_java_struct += (")")
1125                 elif info.from_hu_conv is not None:
1126                     out_java_struct += (info.from_hu_conv[0])
1127                 else:
1128                     out_java_struct += (info.arg_name)
1129             out_java_struct += (");\n")
1130             if return_type_info.to_hu_conv is not None:
1131                 if not takes_self:
1132                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t").replace("this",
1133                                                                                                                return_type_info.to_hu_conv_name) + "\n")
1134                 else:
1135                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t") + "\n")
1136
1137             for idx, info in enumerate(argument_types):
1138                 if idx == 0 and takes_self:
1139                     pass
1140                 elif info.arg_name in default_constructor_args:
1141                     for explode_arg in default_constructor_args[info.arg_name]:
1142                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1143                         if explode_arg.from_hu_conv is not None and return_type_info.to_hu_conv_name:
1144                             out_java_struct += ("\t\t" + explode_arg.from_hu_conv[1].replace(explode_arg.arg_name,
1145                                                                                                expl_arg_name).replace(
1146                                 "this", return_type_info.to_hu_conv_name) + ";\n")
1147                 elif info.from_hu_conv is not None and info.from_hu_conv[1] != "":
1148                     if not takes_self and return_type_info.to_hu_conv_name is not None:
1149                         out_java_struct += (
1150                             "\t\t" + info.from_hu_conv[1].replace("this", return_type_info.to_hu_conv_name).replace("\n", "\n\t\t") + ";\n")
1151                     else:
1152                         out_java_struct += ("\t\t" + info.from_hu_conv[1].replace("\n", "\n\t\t") + ";\n")
1153
1154             if return_type_info.to_hu_conv_name is not None:
1155                 out_java_struct += ("\t\treturn " + return_type_info.to_hu_conv_name + ";\n")
1156             elif return_type_info.java_ty != "void" and return_type_info.rust_obj != "LDK" + struct_meth:
1157                 out_java_struct += ("\t\treturn ret;\n")
1158             out_java_struct += ("\t}\n\n")
1159
1160         return (out_java, out_c, out_java_struct)