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

   1 from bindingstypes import *
   2 from enum import Enum
   3 import sys
   4
   5 class Target(Enum):
   6     JAVA = 1,
   7     ANDROID = 2
   8
   9 class Consts:
  10     def __init__(self, DEBUG: bool, target: Target, **kwargs):
  11         self.target = target
  12         self.c_array_class_caches = set()
  13         self.c_type_map = dict(
  14             uint8_t = ['byte'],
  15             uint16_t = ['short'],
  16             uint32_t = ['int'],
  17             uint64_t = ['long'],
  18         )
  19
  20         self.to_hu_conv_templates = dict(
  21             ptr = '{human_type} {var_name}_hu_conv = null; if ({var_name} < 0 || {var_name} > 4096) { {var_name}_hu_conv = new {human_type}(null, {var_name}); }',
  22             default = '{human_type} {var_name}_hu_conv = null; if ({var_name} < 0 || {var_name} > 4096) { {var_name}_hu_conv = new {human_type}(null, {var_name}); }'
  23         )
  24
  25         self.bindings_header = """package org.ldk.impl;
  26 import org.ldk.enums.*;
  27 import org.ldk.impl.version;
  28 import java.io.File;
  29 import java.io.InputStream;
  30 import java.io.IOException;
  31 import java.nio.file.Files;
  32 import java.nio.file.Path;
  33 import java.nio.file.StandardCopyOption;
  34
  35 public class bindings {
  36         public static class VecOrSliceDef {
  37                 public long dataptr;
  38                 public long datalen;
  39                 public long stride;
  40                 public VecOrSliceDef(long dataptr, long datalen, long stride) {
  41                         this.dataptr = dataptr; this.datalen = datalen; this.stride = stride;
  42                 }
  43         }
  44         static {
  45                 try {
  46                         // Try to load natively first, this works on Android and in testing.
  47                         System.loadLibrary(\"lightningjni\");
  48                 } catch (UnsatisfiedLinkError system_load_err) {
  49                         // Otherwise try to load from the library jar.
  50                         File tmpdir = new File(System.getProperty("java.io.tmpdir"), "ldk-java-nativelib");
  51                         tmpdir.mkdir(); // If it fails to create, assume it was there already
  52                         tmpdir.deleteOnExit();
  53                         String libname = "liblightningjni_" + System.getProperty("os.name").replaceAll(" ", "") +
  54                                 "-" + System.getProperty("os.arch").replaceAll(" ", "") + ".nativelib";
  55                         try (InputStream is = bindings.class.getResourceAsStream("/" + libname)) {
  56                                 Path libpath = new File(tmpdir.toPath().toString(), "liblightningjni.so").toPath();
  57                                 Files.copy(is, libpath, StandardCopyOption.REPLACE_EXISTING);
  58                                 Runtime.getRuntime().load(libpath.toString());
  59                         } catch (Exception e) {
  60                                 System.err.println("Failed to load LDK native library.");
  61                                 System.err.println("System LDK native library load failed with: " + system_load_err);
  62                                 System.err.println("Resource-based LDK native library load failed with: " + e);
  63                                 throw new IllegalArgumentException(e);
  64                         }
  65                 }
  66                 init(java.lang.Enum.class, VecOrSliceDef.class);
  67                 init_class_cache();
  68                 if (!get_lib_version_string().equals(version.get_ldk_java_bindings_version()))
  69                         throw new IllegalArgumentException("Compiled LDK library and LDK class failes do not match");
  70                 // Fetching the LDK versions from C also checks that the header and binaries match
  71                 get_ldk_c_bindings_version();
  72                 get_ldk_version();
  73         }
  74         static native void init(java.lang.Class c, java.lang.Class slicedef);
  75         static native void init_class_cache();
  76         static native String get_lib_version_string();
  77
  78         public static native String get_ldk_c_bindings_version();
  79         public static native String get_ldk_version();
  80
  81         public static native boolean deref_bool(long ptr);
  82         public static native long deref_long(long ptr);
  83         public static native void free_heap_ptr(long ptr);
  84         public static native byte[] read_bytes(long ptr, long len);
  85         public static native byte[] get_u8_slice_bytes(long slice_ptr);
  86         public static native long bytes_to_u8_vec(byte[] bytes);
  87         public static native long new_txpointer_copy_data(byte[] txdata);
  88         public static native void txpointer_free(long ptr);
  89         public static native byte[] txpointer_get_buffer(long ptr);
  90         public static native long vec_slice_len(long vec);
  91         public static native long new_empty_slice_vec();
  92
  93 """
  94         self.bindings_version_file = """package org.ldk.impl;
  95
  96 public class version {
  97         public static String get_ldk_java_bindings_version() {
  98                 return "<git_version_ldk_garbagecollected>";
  99         }
 100 }"""
 101
 102         self.bindings_footer = "}\n"
 103
 104         self.util_fn_pfx = """package org.ldk.structs;
 105 import org.ldk.impl.bindings;
 106 import org.ldk.enums.*;
 107 import org.ldk.util.*;
 108 import java.util.Arrays;
 109 import javax.annotation.Nullable;
 110
 111 public class UtilMethods {
 112 """
 113         self.util_fn_sfx = "}"
 114         self.common_base = """package org.ldk.structs;
 115 import java.util.LinkedList;
 116 class CommonBase {
 117         long ptr;
 118         LinkedList<Object> ptrs_to = new LinkedList();
 119         protected CommonBase(long ptr) { assert ptr < 0 || ptr > 4096; this.ptr = ptr; }
 120 }
 121 """
 122
 123         self.c_file_pfx = """#include <jni.h>
 124 // On OSX jlong (ie long long) is not equivalent to int64_t, so we override here
 125 #define int64_t jlong
 126 #include \"org_ldk_impl_bindings.h\"
 127 #include <lightning.h>
 128 #include <string.h>
 129 #include <stdatomic.h>
 130 #include <stdlib.h>
 131
 132 #define LIKELY(v) __builtin_expect(!!(v), 1)
 133 #define UNLIKELY(v) __builtin_expect(!!(v), 0)
 134
 135 """
 136
 137         if self.target == Target.ANDROID:
 138             self.c_file_pfx = self.c_file_pfx + """
 139 #include <android/log.h>
 140 #define DEBUG_PRINT(...) __android_log_print(ANDROID_LOG_ERROR, "LDK", __VA_ARGS__)
 141
 142 #include <unistd.h>
 143 #include <pthread.h>
 144 static void* redirect_stderr(void* ignored) {
 145         int pipes[2];
 146         pipe(pipes);
 147         dup2(pipes[1], STDERR_FILENO);
 148         char buf[8192];
 149         memset(buf, 0, 8192);
 150         ssize_t len;
 151         while ((len = read(pipes[0], buf, 8191)) > 0) {
 152                 DEBUG_PRINT("%s\\n", buf);
 153                 memset(buf, 0, 8192);
 154         }
 155         DEBUG_PRINT("End of stderr???\\n");
 156         return 0;
 157 }
 158 void __attribute__((constructor)) spawn_stderr_redirection() {
 159         pthread_t thread;
 160         pthread_create(&thread, NULL, &redirect_stderr, NULL);
 161 }
 162 """
 163         else:
 164             self.c_file_pfx = self.c_file_pfx + "#define DEBUG_PRINT(...) fprintf(stderr, __VA_ARGS__)\n"
 165
 166         if not DEBUG or sys.platform == "darwin":
 167             self.c_file_pfx = self.c_file_pfx + """#define MALLOC(a, _) malloc(a)
 168 #define FREE(p) if ((uint64_t)(p) > 4096) { free(p); }
 169 #define CHECK_ACCESS(p)
 170 #define CHECK_INNER_FIELD_ACCESS_OR_NULL(v)
 171 """
 172         if not DEBUG:
 173             self.c_file_pfx += """#define DO_ASSERT(a) (void)(a)
 174 #define CHECK(a)
 175 """
 176         if DEBUG:
 177             self.c_file_pfx = self.c_file_pfx + """#include <assert.h>
 178 // Always run a, then assert it is true:
 179 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
 180 // Assert a is true or do nothing
 181 #define CHECK(a) DO_ASSERT(a)
 182
 183 void __attribute__((constructor)) debug_log_version() {
 184         if (check_get_ldk_version() == NULL)
 185                 DEBUG_PRINT("LDK version did not match the header we built against\\n");
 186         if (check_get_ldk_bindings_version() == NULL)
 187                 DEBUG_PRINT("LDK C Bindings version did not match the header we built against\\n");
 188         DEBUG_PRINT("Loaded LDK-Java Bindings with LDK %s and LDK-C-Bindings %s\\n", check_get_ldk_version(), check_get_ldk_bindings_version());
 189 }
 190 """
 191
 192             if sys.platform != "darwin":
 193                 self.c_file_pfx += """
 194 // Running a leak check across all the allocations and frees of the JDK is a mess,
 195 // so instead we implement our own naive leak checker here, relying on the -wrap
 196 // linker option to wrap malloc/calloc/realloc/free, tracking everyhing allocated
 197 // and free'd in Rust or C across the generated bindings shared library.
 198 #include <threads.h>
 199 """
 200
 201                 if self.target == Target.ANDROID:
 202                     self.c_file_pfx = self.c_file_pfx + """
 203 #include <unwind.h>
 204 #include <dlfcn.h>
 205
 206 // Implement the execinfo functions using _Unwind_backtrace. This seems to miss many Rust
 207 // symbols, so we only use it on Android, where execinfo.h is unavailable.
 208
 209 struct BacktraceState {
 210         void** current;
 211         void** end;
 212 };
 213 static _Unwind_Reason_Code unwind_callback(struct _Unwind_Context* context, void* arg) {
 214         struct BacktraceState* state = (struct BacktraceState*)arg;
 215         uintptr_t pc = _Unwind_GetIP(context);
 216         if (pc) {
 217                 if (state->current == state->end) {
 218                         return _URC_END_OF_STACK;
 219                 } else {
 220                         *state->current++ = (void*)(pc);
 221                 }
 222         }
 223         return _URC_NO_REASON;
 224 }
 225
 226 int backtrace(void** buffer, int max) {
 227         struct BacktraceState state = { buffer, buffer + max };
 228         _Unwind_Backtrace(unwind_callback, &state);
 229         return state.current - buffer;
 230 }
 231
 232 void backtrace_symbols_fd(void ** buffer, int count, int _fd) {
 233         for (int idx = 0; idx < count; ++idx) {
 234                 Dl_info info;
 235                 if (dladdr(buffer[idx], &info) && info.dli_sname) {
 236                         DEBUG_PRINT("%p: %s", buffer[idx], info.dli_sname);
 237                 } else {
 238                         DEBUG_PRINT("%p: ???", buffer[idx]);
 239                 }
 240         }
 241 }
 242 """
 243                 else:
 244                     self.c_file_pfx = self.c_file_pfx + "#include <execinfo.h>\n"
 245                 self.c_file_pfx = self.c_file_pfx + """
 246 #include <unistd.h>
 247 #include <pthread.h>
 248 static pthread_mutex_t allocation_mtx;
 249
 250 void __attribute__((constructor)) init_mtx() {
 251         DO_ASSERT(!pthread_mutex_init(&allocation_mtx, NULL));
 252 }
 253
 254 #define BT_MAX 128
 255 typedef struct allocation {
 256         struct allocation* next;
 257         void* ptr;
 258         const char* struct_name;
 259         void* bt[BT_MAX];
 260         int bt_len;
 261         unsigned long alloc_len;
 262 } allocation;
 263 static allocation* allocation_ll = NULL;
 264
 265 void* __real_malloc(size_t len);
 266 void* __real_calloc(size_t nmemb, size_t len);
 267 static void new_allocation(void* res, const char* struct_name, size_t len) {
 268         allocation* new_alloc = __real_malloc(sizeof(allocation));
 269         new_alloc->ptr = res;
 270         new_alloc->struct_name = struct_name;
 271         new_alloc->bt_len = backtrace(new_alloc->bt, BT_MAX);
 272         new_alloc->alloc_len = len;
 273         DO_ASSERT(!pthread_mutex_lock(&allocation_mtx));
 274         new_alloc->next = allocation_ll;
 275         allocation_ll = new_alloc;
 276         DO_ASSERT(!pthread_mutex_unlock(&allocation_mtx));
 277 }
 278 static void* MALLOC(size_t len, const char* struct_name) {
 279         void* res = __real_malloc(len);
 280         new_allocation(res, struct_name, len);
 281         return res;
 282 }
 283 void __real_free(void* ptr);
 284 static void alloc_freed(void* ptr) {
 285         allocation* p = NULL;
 286         DO_ASSERT(!pthread_mutex_lock(&allocation_mtx));
 287         allocation* it = allocation_ll;
 288         while (it->ptr != ptr) {
 289                 p = it; it = it->next;
 290                 if (it == NULL) {
 291                         DEBUG_PRINT("ERROR: Tried to free unknown pointer %p at:\\n", ptr);
 292                         void* bt[BT_MAX];
 293                         int bt_len = backtrace(bt, BT_MAX);
 294                         backtrace_symbols_fd(bt, bt_len, STDERR_FILENO);
 295                         DEBUG_PRINT("\\n\\n");
 296                         DO_ASSERT(!pthread_mutex_unlock(&allocation_mtx));
 297                         return; // addrsan should catch malloc-unknown and print more info than we have
 298                 }
 299         }
 300         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
 301         DO_ASSERT(!pthread_mutex_unlock(&allocation_mtx));
 302         DO_ASSERT(it->ptr == ptr);
 303         __real_free(it);
 304 }
 305 static void FREE(void* ptr) {
 306         if ((uint64_t)ptr <= 4096) return; // Rust loves to create pointers to the NULL page for dummys
 307         alloc_freed(ptr);
 308         __real_free(ptr);
 309 }
 310
 311 void* __wrap_malloc(size_t len) {
 312         void* res = __real_malloc(len);
 313         new_allocation(res, "malloc call", len);
 314         return res;
 315 }
 316 void* __wrap_calloc(size_t nmemb, size_t len) {
 317         void* res = __real_calloc(nmemb, len);
 318         new_allocation(res, "calloc call", len);
 319         return res;
 320 }
 321 void __wrap_free(void* ptr) {
 322         if (ptr == NULL) return;
 323         alloc_freed(ptr);
 324         __real_free(ptr);
 325 }
 326
 327 static void CHECK_ACCESS(const void* ptr) {
 328         DO_ASSERT(!pthread_mutex_lock(&allocation_mtx));
 329         allocation* it = allocation_ll;
 330         while (it->ptr != ptr) {
 331                 it = it->next;
 332                 if (it == NULL) {
 333                         DEBUG_PRINT("ERROR: Tried to access unknown pointer %p at:\\n", ptr);
 334                         void* bt[BT_MAX];
 335                         int bt_len = backtrace(bt, BT_MAX);
 336                         backtrace_symbols_fd(bt, bt_len, STDERR_FILENO);
 337                         DEBUG_PRINT("\\n\\n");
 338                         DO_ASSERT(!pthread_mutex_unlock(&allocation_mtx));
 339                         return; // addrsan should catch and print more info than we have
 340                 }
 341         }
 342         DO_ASSERT(!pthread_mutex_unlock(&allocation_mtx));
 343 }
 344 #define CHECK_INNER_FIELD_ACCESS_OR_NULL(v) \\
 345         if (v.is_owned && v.inner != NULL) { \\
 346                 const void *p = __unmangle_inner_ptr(v.inner); \\
 347                 if (p != NULL) { \\
 348                         CHECK_ACCESS(p); \\
 349                 } \\
 350         }
 351
 352 void* __real_realloc(void* ptr, size_t newlen);
 353 void* __wrap_realloc(void* ptr, size_t len) {
 354         if (ptr != NULL) alloc_freed(ptr);
 355         void* res = __real_realloc(ptr, len);
 356         new_allocation(res, "realloc call", len);
 357         return res;
 358 }
 359 void __wrap_reallocarray(void* ptr, size_t new_sz) {
 360         // Rust doesn't seem to use reallocarray currently
 361         DO_ASSERT(false);
 362 }
 363
 364 void __attribute__((destructor)) check_leaks() {
 365         unsigned long alloc_count = 0;
 366         unsigned long alloc_size = 0;
 367         DEBUG_PRINT("The following LDK-allocated blocks still remain.\\n");
 368         DEBUG_PRINT("Note that this is only accurate if System.gc(); System.runFinalization()\\n");
 369         DEBUG_PRINT("was called prior to exit after all LDK objects were out of scope.\\n");
 370         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 371                 DEBUG_PRINT("%s %p (%lu bytes) remains:\\n", a->struct_name, a->ptr, a->alloc_len);
 372                 backtrace_symbols_fd(a->bt, a->bt_len, STDERR_FILENO);
 373                 DEBUG_PRINT("\\n\\n");
 374                 alloc_count++;
 375                 alloc_size += a->alloc_len;
 376         }
 377         DEBUG_PRINT("%lu allocations remained for %lu bytes.\\n", alloc_count, alloc_size);
 378         DEBUG_PRINT("Note that this is only accurate if System.gc(); System.runFinalization()\\n");
 379         DEBUG_PRINT("was called prior to exit after all LDK objects were out of scope.\\n");
 380 }
 381 """
 382         self.c_file_pfx = self.c_file_pfx + """
 383 static jmethodID ordinal_meth = NULL;
 384 static jmethodID slicedef_meth = NULL;
 385 static jclass slicedef_cls = NULL;
 386 JNIEXPORT void Java_org_ldk_impl_bindings_init(JNIEnv * env, jclass _b, jclass enum_class, jclass slicedef_class) {
 387         ordinal_meth = (*env)->GetMethodID(env, enum_class, "ordinal", "()I");
 388         CHECK(ordinal_meth != NULL);
 389         slicedef_meth = (*env)->GetMethodID(env, slicedef_class, "<init>", "(JJJ)V");
 390         CHECK(slicedef_meth != NULL);
 391         slicedef_cls = (*env)->NewGlobalRef(env, slicedef_class);
 392         CHECK(slicedef_cls != NULL);
 393 }
 394
 395 JNIEXPORT jboolean JNICALL Java_org_ldk_impl_bindings_deref_1bool (JNIEnv * env, jclass _a, jlong ptr) {
 396         return *((bool*)ptr);
 397 }
 398 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_deref_1long (JNIEnv * env, jclass _a, jlong ptr) {
 399         return *((long*)ptr);
 400 }
 401 JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_free_1heap_1ptr (JNIEnv * env, jclass _a, jlong ptr) {
 402         FREE((void*)ptr);
 403 }
 404 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_read_1bytes (JNIEnv * env, jclass _b, jlong ptr, jlong len) {
 405         jbyteArray ret_arr = (*env)->NewByteArray(env, len);
 406         (*env)->SetByteArrayRegion(env, ret_arr, 0, len, (unsigned char*)ptr);
 407         return ret_arr;
 408 }
 409 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_get_1u8_1slice_1bytes (JNIEnv * env, jclass _b, jlong slice_ptr) {
 410         LDKu8slice *slice = (LDKu8slice*)slice_ptr;
 411         jbyteArray ret_arr = (*env)->NewByteArray(env, slice->datalen);
 412         (*env)->SetByteArrayRegion(env, ret_arr, 0, slice->datalen, slice->data);
 413         return ret_arr;
 414 }
 415 JNIEXPORT int64_t impl_bindings_bytes_1to_1u8_1vec (JNIEnv * env, jclass _b, jbyteArray bytes) {
 416         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "LDKCVec_u8");
 417         vec->datalen = (*env)->GetArrayLength(env, bytes);
 418         vec->data = (uint8_t*)MALLOC(vec->datalen, "LDKCVec_u8Z Bytes");
 419         (*env)->GetByteArrayRegion (env, bytes, 0, vec->datalen, vec->data);
 420         return (uint64_t)vec;
 421 }
 422 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_txpointer_1get_1buffer (JNIEnv * env, jclass _b, jlong ptr) {
 423         LDKTransaction *txdata = (LDKTransaction*)ptr;
 424         LDKu8slice slice;
 425         slice.data = txdata->data;
 426         slice.datalen = txdata->datalen;
 427         return Java_org_ldk_impl_bindings_get_1u8_1slice_1bytes(env, _b, (uint64_t)&slice);
 428 }
 429 JNIEXPORT int64_t JNICALL Java_org_ldk_impl_bindings_new_1txpointer_1copy_1data (JNIEnv * env, jclass _b, jbyteArray bytes) {
 430         LDKTransaction *txdata = (LDKTransaction*)MALLOC(sizeof(LDKTransaction), "LDKTransaction");
 431         txdata->datalen = (*env)->GetArrayLength(env, bytes);
 432         txdata->data = (uint8_t*)MALLOC(txdata->datalen, "Tx Data Bytes");
 433         txdata->data_is_owned = false;
 434         (*env)->GetByteArrayRegion (env, bytes, 0, txdata->datalen, txdata->data);
 435         return (uint64_t)txdata;
 436 }
 437 JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_txpointer_1free (JNIEnv * env, jclass _b, jlong ptr) {
 438         LDKTransaction *tx = (LDKTransaction*)ptr;
 439         tx->data_is_owned = true;
 440         Transaction_free(*tx);
 441         FREE((void*)ptr);
 442 }
 443 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_vec_1slice_1len (JNIEnv * env, jclass _a, jlong ptr) {
 444         // Check offsets of a few Vec types are all consistent as we're meant to be generic across types
 445         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_SignatureZ, datalen), "Vec<*> needs to be mapped identically");
 446         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_MessageSendEventZ, datalen), "Vec<*> needs to be mapped identically");
 447         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_EventZ, datalen), "Vec<*> needs to be mapped identically");
 448         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_C2Tuple_usizeTransactionZZ, datalen), "Vec<*> needs to be mapped identically");
 449         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)ptr;
 450         return (uint64_t)vec->datalen;
 451 }
 452 JNIEXPORT int64_t JNICALL Java_org_ldk_impl_bindings_new_1empty_1slice_1vec (JNIEnv * env, jclass _b) {
 453         // Check sizes of a few Vec types are all consistent as we're meant to be generic across types
 454         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_SignatureZ), "Vec<*> needs to be mapped identically");
 455         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_MessageSendEventZ), "Vec<*> needs to be mapped identically");
 456         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_EventZ), "Vec<*> needs to be mapped identically");
 457         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_C2Tuple_usizeTransactionZZ), "Vec<*> needs to be mapped identically");
 458         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "Empty LDKCVec");
 459         vec->data = NULL;
 460         vec->datalen = 0;
 461         return (uint64_t)vec;
 462 }
 463
 464 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
 465 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
 466 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
 467 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
 468
 469 _Static_assert(sizeof(jlong) == sizeof(int64_t), "We assume that j-types are the same as C types");
 470 _Static_assert(sizeof(jbyte) == sizeof(char), "We assume that j-types are the same as C types");
 471 _Static_assert(sizeof(void*) <= 8, "Pointers must fit into 64 bits");
 472
 473 typedef jlongArray int64_tArray;
 474 typedef jbyteArray int8_tArray;
 475
 476 static inline jstring str_ref_to_java(JNIEnv *env, const char* chars, size_t len) {
 477         // Sadly we need to create a temporary because Java can't accept a char* without a 0-terminator
 478         char* conv_buf = MALLOC(len + 1, "str conv buf");
 479         memcpy(conv_buf, chars, len);
 480         conv_buf[len] = 0;
 481         jstring ret = (*env)->NewStringUTF(env, conv_buf);
 482         FREE(conv_buf);
 483         return ret;
 484 }
 485 static inline LDKStr java_to_owned_str(JNIEnv *env, jstring str) {
 486         uint64_t str_len = (*env)->GetStringUTFLength(env, str);
 487         char* newchars = MALLOC(str_len + 1, "String chars");
 488         const char* jchars = (*env)->GetStringUTFChars(env, str, NULL);
 489         memcpy(newchars, jchars, str_len);
 490         newchars[str_len] = 0;
 491         (*env)->ReleaseStringUTFChars(env, str, jchars);
 492         LDKStr res = {
 493                 .chars = newchars,
 494                 .len = str_len,
 495                 .chars_is_owned = true
 496         };
 497         return res;
 498 }
 499
 500 JNIEXPORT jstring JNICALL Java_org_ldk_impl_bindings_get_1ldk_1c_1bindings_1version(JNIEnv *env, jclass _c) {
 501         return str_ref_to_java(env, check_get_ldk_bindings_version(), strlen(check_get_ldk_bindings_version()));
 502 }
 503 JNIEXPORT jstring JNICALL Java_org_ldk_impl_bindings_get_1ldk_1version(JNIEnv *env, jclass _c) {
 504         return str_ref_to_java(env, check_get_ldk_version(), strlen(check_get_ldk_version()));
 505 }
 506 #include "version.c"
 507 """
 508         self.c_version_file = """JNIEXPORT jstring JNICALL Java_org_ldk_impl_bindings_get_1lib_1version_1string(JNIEnv *env, jclass _c) {
 509         return str_ref_to_java(env, "<git_version_ldk_garbagecollected>", strlen("<git_version_ldk_garbagecollected>"));
 510 }"""
 511
 512         self.hu_struct_file_prefix = """package org.ldk.structs;
 513
 514 import org.ldk.impl.bindings;
 515 import org.ldk.enums.*;
 516 import org.ldk.util.*;
 517 import java.util.Arrays;
 518 import java.lang.ref.Reference;
 519 import javax.annotation.Nullable;
 520
 521 """
 522         self.c_fn_ty_pfx = "JNIEXPORT "
 523         self.c_fn_args_pfx = "JNIEnv *env, jclass clz"
 524         self.file_ext = ".java"
 525         self.ptr_c_ty = "int64_t"
 526         self.ptr_native_ty = "long"
 527         self.result_c_ty = "jclass"
 528         self.ptr_arr = "jobjectArray"
 529         self.is_arr_some_check = ("", " != NULL")
 530         self.get_native_arr_len_call = ("(*env)->GetArrayLength(env, ", ")")
 531
 532     def construct_jenv(self):
 533         res =  "JNIEnv *env;\n"
 534         res += "jint get_jenv_res = (*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_6);\n"
 535         res += "if (get_jenv_res == JNI_EDETACHED) {\n"
 536         if self.target == Target.ANDROID:
 537             res += "\tDO_ASSERT((*j_calls->vm)->AttachCurrentThread(j_calls->vm, &env, NULL) == JNI_OK);\n"
 538         else:
 539             res += "\tDO_ASSERT((*j_calls->vm)->AttachCurrentThread(j_calls->vm, (void**)&env, NULL) == JNI_OK);\n"
 540         res += "} else {\n"
 541         res += "\tDO_ASSERT(get_jenv_res == JNI_OK);\n"
 542         res += "}\n"
 543         return res
 544     def deconstruct_jenv(self):
 545         res = "if (get_jenv_res == JNI_EDETACHED) {\n"
 546         res += "\tDO_ASSERT((*j_calls->vm)->DetachCurrentThread(j_calls->vm) == JNI_OK);\n"
 547         res += "}\n"
 548         return res
 549
 550     def release_native_arr_ptr_call(self, ty_info, arr_var, arr_ptr_var):
 551         if ty_info.subty is None or not ty_info.subty.c_ty.endswith("Array"):
 552             return "(*env)->ReleasePrimitiveArrayCritical(env, " + arr_var + ", " + arr_ptr_var + ", 0)"
 553         return None
 554     def create_native_arr_call(self, arr_len, ty_info):
 555         if ty_info.c_ty == "int8_tArray":
 556             return "(*env)->NewByteArray(env, " + arr_len + ")"
 557         elif ty_info.subty.c_ty.endswith("Array"):
 558             clz_var = ty_info.java_fn_ty_arg[1:].replace("[", "arr_of_")
 559             self.c_array_class_caches.add(clz_var)
 560             return "(*env)->NewObjectArray(env, " + arr_len + ", " + clz_var + "_clz, NULL);\n"
 561         else:
 562             return "(*env)->New" + ty_info.java_ty.strip("[]").title() + "Array(env, " + arr_len + ")"
 563     def set_native_arr_contents(self, arr_name, arr_len, ty_info):
 564         if ty_info.c_ty == "int8_tArray":
 565             return ("(*env)->SetByteArrayRegion(env, " + arr_name + ", 0, " + arr_len + ", ", ")")
 566         else:
 567             assert False
 568     def get_native_arr_contents(self, arr_name, dest_name, arr_len, ty_info, copy):
 569         if ty_info.c_ty == "int8_tArray":
 570             if copy:
 571                 return "(*env)->GetByteArrayRegion(env, " + arr_name + ", 0, " + arr_len + ", " + dest_name + ")"
 572             else:
 573                 return "(*env)->GetByteArrayElements (env, " + arr_name + ", NULL)"
 574         elif not ty_info.java_ty[:len(ty_info.java_ty) - 2].endswith("[]"):
 575             return "(*env)->Get" + ty_info.subty.java_ty.title() + "ArrayElements (env, " + arr_name + ", NULL)"
 576         else:
 577             return None
 578     def get_native_arr_elem(self, arr_name, idxc, ty_info):
 579         if self.get_native_arr_contents(arr_name, "", "", ty_info, False) is None:
 580             return "(*env)->GetObjectArrayElement(env, " + arr_name + ", " + idxc + ")"
 581         else:
 582             assert False # Only called if above is None
 583     def get_native_arr_ptr_call(self, ty_info):
 584         if ty_info.subty is not None and ty_info.subty.c_ty.endswith("Array"):
 585             return None
 586         return ("(*env)->GetPrimitiveArrayCritical(env, ", ", NULL)")
 587     def get_native_arr_entry_call(self, ty_info, arr_name, idxc, entry_access):
 588         if ty_info.subty is None or not ty_info.subty.c_ty.endswith("Array"):
 589             return None
 590         return "(*env)->SetObjectArrayElement(env, " + arr_name + ", " + idxc + ", " + entry_access + ")"
 591     def cleanup_native_arr_ref_contents(self, arr_name, dest_name, arr_len, ty_info):
 592         if ty_info.c_ty == "int8_tArray":
 593             return "(*env)->ReleaseByteArrayElements(env, " + arr_name + ", (int8_t*)" + dest_name + ", 0);"
 594         else:
 595             return "(*env)->Release" + ty_info.java_ty.strip("[]").title() + "ArrayElements(env, " + arr_name + ", " + dest_name + ", 0)"
 596
 597     def str_ref_to_native_call(self, var_name, str_len):
 598         return "str_ref_to_java(env, " + var_name + ", " + str_len + ")"
 599     def str_ref_to_c_call(self, var_name):
 600         return "java_to_owned_str(env, " + var_name + ")"
 601
 602     def c_fn_name_define_pfx(self, fn_name, has_args):
 603         if has_args:
 604             return "JNICALL Java_org_ldk_impl_bindings_" + fn_name.replace("_", "_1") + "(JNIEnv *env, jclass clz, "
 605         return "JNICALL Java_org_ldk_impl_bindings_" + fn_name.replace("_", "_1") + "(JNIEnv *env, jclass clz"
 606
 607     def init_str(self):
 608         res = ""
 609         for ty in sorted(self.c_array_class_caches):
 610             res = res + "static jclass " + ty + "_clz = NULL;\n"
 611         res = res + "JNIEXPORT void Java_org_ldk_impl_bindings_init_1class_1cache(JNIEnv * env, jclass clz) {\n"
 612         for ty in sorted(self.c_array_class_caches):
 613             res = res + "\t" + ty + "_clz = (*env)->FindClass(env, \"" + ty.replace("arr_of_", "[") + "\");\n"
 614             res = res + "\tCHECK(" + ty + "_clz != NULL);\n"
 615             res = res + "\t" + ty + "_clz = (*env)->NewGlobalRef(env, " + ty + "_clz);\n"
 616         res = res + "}\n"
 617         return res
 618
 619     def native_c_unitary_enum_map(self, struct_name, variants, enum_doc_comment):
 620         out_java_enum = "package org.ldk.enums;\n\n"
 621         out_java = ""
 622         out_c = ""
 623         out_c += "static inline LDK" + struct_name + " LDK" + struct_name + "_from_java(" + self.c_fn_args_pfx + ") {\n"
 624         out_c += "\tjint ord = (*env)->CallIntMethod(env, clz, ordinal_meth);\n"
 625         out_c += "\tif (UNLIKELY((*env)->ExceptionCheck(env))) {\n"
 626         out_c += "\t\t(*env)->ExceptionDescribe(env);\n"
 627         out_c += "\t\t(*env)->FatalError(env, \"A call to " + struct_name + ".ordinal() from rust threw an exception.\");\n"
 628         out_c += "\t}\n"
 629         out_c += "\tswitch (ord) {\n"
 630
 631         if enum_doc_comment is not None:
 632             out_java_enum += "/**\n * " + enum_doc_comment.replace("\n", "\n * ") + "\n */\n"
 633         out_java_enum += "public enum " + struct_name + " {\n"
 634         ord_v = 0
 635         for var, var_docs in variants:
 636             if var_docs is not None:
 637                 out_java_enum += "\t/**\n\t * " + var_docs.replace("\n", "\n\t * ") + "\n\t */\n"
 638             out_java_enum += "\t" + var + ",\n"
 639             out_c = out_c + "\t\tcase %d: return %s;\n" % (ord_v, var)
 640             ord_v = ord_v + 1
 641         out_java_enum = out_java_enum + "\t; static native void init();\n"
 642         out_java_enum = out_java_enum + "\tstatic { init(); }\n"
 643         out_java_enum = out_java_enum + "}"
 644         out_java = out_java + "\tstatic { " + struct_name + ".values(); /* Force enum statics to run */ }\n"
 645         out_c += "\t}\n"
 646         out_c += "\t(*env)->FatalError(env, \"A call to " + struct_name + ".ordinal() from rust returned an invalid value.\");\n"
 647         out_c += "\tabort(); // Unreachable, but will let the compiler know we don't return here\n"
 648         out_c += "}\n"
 649
 650         out_c = out_c + "static jclass " + struct_name + "_class = NULL;\n"
 651         for var, _ in variants:
 652             out_c = out_c + "static jfieldID " + struct_name + "_" + var + " = NULL;\n"
 653         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"
 654         out_c = out_c + "\t" + struct_name + "_class = (*env)->NewGlobalRef(env, clz);\n"
 655         out_c = out_c + "\tCHECK(" + struct_name + "_class != NULL);\n"
 656         for var, _ in variants:
 657             out_c = out_c + "\t" + struct_name + "_" + var + " = (*env)->GetStaticFieldID(env, " + struct_name + "_class, \"" + var + "\", \"Lorg/ldk/enums/" + struct_name + ";\");\n"
 658             out_c = out_c + "\tCHECK(" + struct_name + "_" + var + " != NULL);\n"
 659         out_c = out_c + "}\n"
 660         out_c = out_c + "static inline jclass LDK" + struct_name + "_to_java(JNIEnv *env, LDK" + struct_name + " val) {\n"
 661         out_c = out_c + "\tswitch (val) {\n"
 662         ord_v = 0
 663         for var, _ in variants:
 664             out_c = out_c + "\t\tcase " + var + ":\n"
 665             out_c = out_c + "\t\t\treturn (*env)->GetStaticObjectField(env, " + struct_name + "_class, " + struct_name + "_" + var + ");\n"
 666             ord_v = ord_v + 1
 667         out_c = out_c + "\t\tdefault: abort();\n"
 668         out_c = out_c + "\t}\n"
 669         out_c = out_c + "}\n\n"
 670
 671         return (out_c, out_java_enum, out_java)
 672
 673     def c_unitary_enum_to_native_call(self, ty_info):
 674         return (ty_info.rust_obj + "_to_java(env, ", ")")
 675     def native_unitary_enum_to_c_call(self, ty_info):
 676         return (ty_info.rust_obj + "_from_java(env, ", ")")
 677
 678     def c_complex_enum_pfx(self, struct_name, variants, init_meth_jty_strs):
 679         out_c = ""
 680         for var in variants:
 681             out_c = out_c + "static jclass " + struct_name + "_" + var + "_class = NULL;\n"
 682             out_c = out_c + "static jmethodID " + struct_name + "_" + var + "_meth = NULL;\n"
 683         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"
 684         for var_name in variants:
 685             out_c += "\t" + struct_name + "_" + var_name + "_class =\n"
 686             out_c += "\t\t(*env)->NewGlobalRef(env, (*env)->FindClass(env, \"org/ldk/impl/bindings$" + struct_name + "$" + var_name + "\"));\n"
 687             out_c += "\tCHECK(" + struct_name + "_" + var_name + "_class != NULL);\n"
 688             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"
 689             out_c += "\tCHECK(" + struct_name + "_" + var_name + "_meth != NULL);\n"
 690         out_c = out_c + "}\n"
 691         return out_c
 692
 693     def c_complex_enum_pass_ty(self, struct_name):
 694         return "jobject"
 695
 696     def c_constr_native_complex_enum(self, struct_name, variant, c_params):
 697         ret = "(*env)->NewObject(env, " + struct_name + "_" + variant + "_class, " + struct_name + "_" + variant + "_meth"
 698         for param in c_params:
 699             ret = ret + ", " + param
 700         return ret + ")"
 701
 702     def native_c_map_trait(self, struct_name, field_vars, flattened_field_vars, field_fns, trait_doc_comment):
 703         out_java_trait = ""
 704         out_java = ""
 705
 706         # First generate most of the Java code, note that we need information about java method argument strings for C
 707         out_java_trait = out_java_trait + self.hu_struct_file_prefix
 708         if trait_doc_comment is not None:
 709             out_java_trait += "/**\n * " + trait_doc_comment.replace("\n", "\n * ") + "\n */\n"
 710         out_java_trait += "@SuppressWarnings(\"unchecked\") // We correctly assign various generic arrays\n"
 711         out_java_trait = out_java_trait + "public class " + struct_name.replace("LDK","") + " extends CommonBase {\n"
 712         out_java_trait = out_java_trait + "\tfinal bindings." + struct_name + " bindings_instance;\n"
 713         out_java_trait = out_java_trait + "\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); bindings_instance = null; }\n"
 714         out_java_trait = out_java_trait + "\tprivate " + struct_name.replace("LDK", "") + "(bindings." + struct_name + " arg"
 715         for var in flattened_field_vars:
 716             if isinstance(var, ConvInfo):
 717                 out_java_trait = out_java_trait + ", " + var.java_hu_ty + " " + var.arg_name
 718             else:
 719                 out_java_trait = out_java_trait + ", bindings." + var[0] + " " + var[1]
 720         out_java_trait = out_java_trait + ") {\n"
 721         out_java_trait = out_java_trait + "\t\tsuper(bindings." + struct_name + "_new(arg"
 722         for var in flattened_field_vars:
 723             if isinstance(var, ConvInfo):
 724                 if var.from_hu_conv is not None:
 725                     out_java_trait = out_java_trait + ", " + var.from_hu_conv[0]
 726                 else:
 727                     out_java_trait = out_java_trait + ", " + var.arg_name
 728             else:
 729                 out_java_trait = out_java_trait + ", " + var[1]
 730         out_java_trait = out_java_trait + "));\n"
 731         out_java_trait = out_java_trait + "\t\tthis.ptrs_to.add(arg);\n"
 732         for var in flattened_field_vars:
 733             if isinstance(var, ConvInfo):
 734                 if var.from_hu_conv is not None and var.from_hu_conv[1] != "":
 735                     out_java_trait = out_java_trait + "\t\t" + var.from_hu_conv[1].replace("\n", "\n\t\t") + ";\n"
 736             else:
 737                 out_java_trait = out_java_trait + "\t\tthis.ptrs_to.add(" + var[1] + ");\n"
 738         out_java_trait = out_java_trait + "\t\tthis.bindings_instance = arg;\n"
 739         out_java_trait = out_java_trait + "\t}\n"
 740         out_java_trait = out_java_trait + "\t@Override @SuppressWarnings(\"deprecation\")\n"
 741         out_java_trait = out_java_trait + "\tprotected void finalize() throws Throwable {\n"
 742         out_java_trait = out_java_trait + "\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); } super.finalize();\n"
 743         out_java_trait = out_java_trait + "\t}\n\n"
 744
 745         java_trait_constr = "\tprivate static class " + struct_name + "Holder { " + struct_name.replace("LDK", "") + " held; }\n"
 746         java_trait_constr = java_trait_constr + "\tpublic static " + struct_name.replace("LDK", "") + " new_impl(" + struct_name.replace("LDK", "") + "Interface arg"
 747         for var in flattened_field_vars:
 748             if isinstance(var, ConvInfo):
 749                 java_trait_constr = java_trait_constr + ", " + var.java_hu_ty + " " + var.arg_name
 750             else:
 751                 # Ideally we'd be able to take any instance of the interface, but our C code can only represent
 752                 # Java-implemented version, so we require users pass a Java implementation here :/
 753                 java_trait_constr = java_trait_constr + ", " + var[0].replace("LDK", "") + "." + var[0].replace("LDK", "") + "Interface " + var[1] + "_impl"
 754         java_trait_constr = java_trait_constr + ") {\n\t\tfinal " + struct_name + "Holder impl_holder = new " + struct_name + "Holder();\n"
 755         java_trait_constr = java_trait_constr + "\t\timpl_holder.held = new " + struct_name.replace("LDK", "") + "(new bindings." + struct_name + "() {\n"
 756         out_java_trait = out_java_trait + "\tpublic static interface " + struct_name.replace("LDK", "") + "Interface {\n"
 757         out_java = out_java + "\tpublic interface " + struct_name + " {\n"
 758         java_meths = []
 759         for fn_line in field_fns:
 760             java_meth_descr = "("
 761             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 762                 out_java = out_java + "\t\t " + fn_line.ret_ty_info.java_ty + " " + fn_line.fn_name + "("
 763                 java_trait_constr = java_trait_constr + "\t\t\t@Override public " + fn_line.ret_ty_info.java_ty + " " + fn_line.fn_name + "("
 764                 out_java_trait += "\t\t/**\n\t\t * " + fn_line.docs.replace("\n", "\n\t\t * ") + "\n\t\t */\n"
 765                 out_java_trait = out_java_trait + "\t\t" + fn_line.ret_ty_info.java_hu_ty + " " + fn_line.fn_name + "("
 766
 767                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 768                     if idx >= 1:
 769                         out_java = out_java + ", "
 770                         java_trait_constr = java_trait_constr + ", "
 771                         out_java_trait = out_java_trait + ", "
 772                     out_java = out_java + arg_conv_info.java_ty + " " + arg_conv_info.arg_name
 773                     out_java_trait = out_java_trait + arg_conv_info.java_hu_ty + " " + arg_conv_info.arg_name
 774                     java_trait_constr = java_trait_constr + arg_conv_info.java_ty + " " + arg_conv_info.arg_name
 775                     java_meth_descr = java_meth_descr + arg_conv_info.java_fn_ty_arg
 776                 java_meth_descr = java_meth_descr + ")" + fn_line.ret_ty_info.java_fn_ty_arg
 777                 java_meths.append((fn_line.fn_name, java_meth_descr))
 778
 779                 out_java = out_java + ");\n"
 780                 out_java_trait = out_java_trait + ");\n"
 781                 java_trait_constr = java_trait_constr + ") {\n"
 782
 783                 for arg_info in fn_line.args_ty:
 784                     if arg_info.to_hu_conv is not None:
 785                         java_trait_constr = java_trait_constr + "\t\t\t\t" + arg_info.to_hu_conv.replace("\n", "\n\t\t\t\t") + "\n"
 786
 787                 if fn_line.ret_ty_info.java_ty != "void":
 788                     java_trait_constr = java_trait_constr + "\t\t\t\t" + fn_line.ret_ty_info.java_hu_ty + " ret = arg." + fn_line.fn_name + "("
 789                 else:
 790                     java_trait_constr = java_trait_constr + "\t\t\t\targ." + fn_line.fn_name + "("
 791
 792                 for idx, arg_info in enumerate(fn_line.args_ty):
 793                     if idx != 0:
 794                         java_trait_constr = java_trait_constr + ", "
 795                     if arg_info.to_hu_conv_name is not None:
 796                         java_trait_constr = java_trait_constr + arg_info.to_hu_conv_name
 797                     else:
 798                         java_trait_constr = java_trait_constr + arg_info.arg_name
 799
 800                 java_trait_constr = java_trait_constr + ");\n"
 801                 if fn_line.ret_ty_info.java_ty != "void":
 802                     if fn_line.ret_ty_info.from_hu_conv is not None:
 803                         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"
 804                         if fn_line.ret_ty_info.from_hu_conv[1] != "":
 805                             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"
 806                         #if fn_line.ret_ty_info.rust_obj in result_types:
 807                         java_trait_constr = java_trait_constr + "\t\t\t\treturn result;\n"
 808                     else:
 809                         java_trait_constr = java_trait_constr + "\t\t\t\treturn ret;\n"
 810                 java_trait_constr = java_trait_constr + "\t\t\t}\n"
 811         java_trait_constr = java_trait_constr + "\t\t}"
 812         for var in field_vars:
 813             if isinstance(var, ConvInfo):
 814                 java_trait_constr = java_trait_constr + ", " + var.arg_name
 815             else:
 816                 java_trait_constr += ", " + var[1] + ".new_impl(" + var[1] + "_impl"
 817                 for suparg in var[2]:
 818                     if isinstance(suparg, ConvInfo):
 819                         java_trait_constr += ", " + suparg.arg_name
 820                     else:
 821                         java_trait_constr += ", " + suparg[1]
 822                 java_trait_constr += ").bindings_instance"
 823                 for suparg in var[2]:
 824                     if isinstance(suparg, ConvInfo):
 825                         java_trait_constr += ", " + suparg.arg_name
 826                     else:
 827                         java_trait_constr += ", " + suparg[1]
 828         out_java_trait = out_java_trait + "\t}\n"
 829         out_java_trait = out_java_trait + java_trait_constr + ");\n\t\treturn impl_holder.held;\n\t}\n"
 830
 831         out_java = out_java + "\t}\n"
 832
 833         out_java = out_java + "\tpublic static native long " + struct_name + "_new(" + struct_name + " impl"
 834         for var in flattened_field_vars:
 835             if isinstance(var, ConvInfo):
 836                 out_java = out_java + ", " + var.java_ty + " " + var.arg_name
 837             else:
 838                 out_java = out_java + ", " + var[0] + " " + var[1]
 839         out_java = out_java + ");\n"
 840
 841         # Now that we've written out our java code (and created java_meths), generate C
 842         out_c = "typedef struct " + struct_name + "_JCalls {\n"
 843         out_c = out_c + "\tatomic_size_t refcnt;\n"
 844         out_c = out_c + "\tJavaVM *vm;\n"
 845         out_c = out_c + "\tjweak o;\n"
 846         for var in flattened_field_vars:
 847             if isinstance(var, ConvInfo):
 848                 # We're a regular ol' field
 849                 pass
 850             else:
 851                 # We're a supertrait
 852                 out_c = out_c + "\t" + var[0] + "_JCalls* " + var[1] + ";\n"
 853         for fn in field_fns:
 854             if fn.fn_name != "free" and fn.fn_name != "cloned":
 855                 out_c = out_c + "\tjmethodID " + fn.fn_name + "_meth;\n"
 856         out_c = out_c + "} " + struct_name + "_JCalls;\n"
 857
 858         for fn_line in field_fns:
 859             if fn_line.fn_name == "free":
 860                 out_c = out_c + "static void " + struct_name + "_JCalls_free(void* this_arg) {\n"
 861                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 862                 out_c = out_c + "\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n"
 863                 out_c += "\t\t" + self.construct_jenv().replace("\n", "\n\t\t").strip() + "\n"
 864                 out_c = out_c + "\t\t(*env)->DeleteWeakGlobalRef(env, j_calls->o);\n"
 865                 out_c += "\t\t" + self.deconstruct_jenv().replace("\n", "\n\t\t").strip() + "\n"
 866                 out_c = out_c + "\t\tFREE(j_calls);\n"
 867                 out_c = out_c + "\t}\n}\n"
 868
 869         for idx, fn_line in enumerate(field_fns):
 870             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 871                 assert fn_line.ret_ty_info.ty_info.get_full_rust_ty()[1] == ""
 872                 out_c = out_c + fn_line.ret_ty_info.ty_info.get_full_rust_ty()[0] + " " + fn_line.fn_name + "_" + struct_name + "_jcall("
 873                 if fn_line.self_is_const:
 874                     out_c = out_c + "const void* this_arg"
 875                 else:
 876                     out_c = out_c + "void* this_arg"
 877
 878                 for idx, arg in enumerate(fn_line.args_ty):
 879                     out_c = out_c + ", " + arg.ty_info.get_full_rust_ty()[0] + " " + arg.arg_name + arg.ty_info.get_full_rust_ty()[1]
 880
 881                 out_c = out_c + ") {\n"
 882                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 883                 out_c += "\t" + self.construct_jenv().replace("\n", "\n\t").strip() + "\n"
 884
 885                 for arg_info in fn_line.args_ty:
 886                     if arg_info.ret_conv is not None:
 887                         out_c = out_c + "\t" + arg_info.ret_conv[0].replace('\n', '\n\t')
 888                         out_c = out_c + arg_info.arg_name
 889                         out_c = out_c + arg_info.ret_conv[1].replace('\n', '\n\t') + "\n"
 890
 891                 out_c = out_c + "\tjobject obj = (*env)->NewLocalRef(env, j_calls->o);\n\tCHECK(obj != NULL);\n"
 892                 if fn_line.ret_ty_info.c_ty.endswith("Array"):
 893                     out_c = out_c + "\t" + fn_line.ret_ty_info.c_ty + " ret = (*env)->CallObjectMethod(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 894                 elif fn_line.ret_ty_info.c_ty == "void":
 895                     out_c += "\t(*env)->Call" + fn_line.ret_ty_info.java_ty.title() + "Method(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 896                 elif fn_line.ret_ty_info.java_ty == "String":
 897                     # Manually write out String methods as they're just an Object
 898                     out_c += "\t" + fn_line.ret_ty_info.c_ty + " ret = (*env)->CallObjectMethod(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 899                 elif not fn_line.ret_ty_info.passed_as_ptr:
 900                     out_c += "\t" + fn_line.ret_ty_info.c_ty + " ret = (*env)->Call" + fn_line.ret_ty_info.java_ty.title() + "Method(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 901                 else:
 902                     out_c = out_c + "\tuint64_t ret = (*env)->CallLongMethod(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 903
 904                 for idx, arg_info in enumerate(fn_line.args_ty):
 905                     if arg_info.ret_conv is not None:
 906                         out_c = out_c + ", " + arg_info.ret_conv_name
 907                     else:
 908                         out_c = out_c + ", " + arg_info.arg_name
 909                 out_c = out_c + ");\n"
 910
 911                 out_c += "\tif (UNLIKELY((*env)->ExceptionCheck(env))) {\n"
 912                 out_c += "\t\t(*env)->ExceptionDescribe(env);\n"
 913                 out_c += "\t\t(*env)->FatalError(env, \"A call to " + fn_line.fn_name + " in " + struct_name + " from rust threw an exception.\");\n"
 914                 out_c += "\t}\n"
 915
 916                 if fn_line.ret_ty_info.arg_conv is not None:
 917                     out_c += "\t" + fn_line.ret_ty_info.arg_conv.replace("\n", "\n\t") + "\n"
 918                     out_c += "\t" + self.deconstruct_jenv().replace("\n", "\n\t").strip() + "\n"
 919                     out_c += "\treturn " + fn_line.ret_ty_info.arg_conv_name + ";\n"
 920                 else:
 921                     out_c += "\t" + self.deconstruct_jenv().replace("\n", "\n\t").strip() + "\n"
 922                     if not fn_line.ret_ty_info.passed_as_ptr and fn_line.ret_ty_info.c_ty != "void":
 923                         out_c += "\treturn ret;\n"
 924
 925                 out_c = out_c + "}\n"
 926
 927         # If we can, write out a clone function whether we need one or not, as we use them in moving to rust
 928         can_clone_with_ptr = True
 929         for var in field_vars:
 930             if isinstance(var, ConvInfo):
 931                 can_clone_with_ptr = False
 932         if can_clone_with_ptr:
 933             out_c = out_c + "static void " + struct_name + "_JCalls_cloned(" + struct_name + "* new_obj) {\n"
 934             out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) new_obj->this_arg;\n"
 935             out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n"
 936             for var in field_vars:
 937                 if not isinstance(var, ConvInfo):
 938                     out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->" + var[1] + "->refcnt, 1, memory_order_release);\n"
 939             out_c = out_c + "}\n"
 940
 941         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_init (" + self.c_fn_args_pfx + ", jobject o"
 942         for var in flattened_field_vars:
 943             if isinstance(var, ConvInfo):
 944                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 945             else:
 946                 out_c = out_c + ", jobject " + var[1]
 947         out_c = out_c + ") {\n"
 948
 949         out_c = out_c + "\tjclass c = (*env)->GetObjectClass(env, o);\n"
 950         out_c = out_c + "\tCHECK(c != NULL);\n"
 951         out_c = out_c + "\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n"
 952         out_c = out_c + "\tatomic_init(&calls->refcnt, 1);\n"
 953         out_c = out_c + "\tDO_ASSERT((*env)->GetJavaVM(env, &calls->vm) == 0);\n"
 954         out_c = out_c + "\tcalls->o = (*env)->NewWeakGlobalRef(env, o);\n"
 955
 956         for (fn_name, java_meth_descr) in java_meths:
 957             if fn_name != "free" and fn_name != "cloned":
 958                 out_c = out_c + "\tcalls->" + fn_name + "_meth = (*env)->GetMethodID(env, c, \"" + fn_name + "\", \"" + java_meth_descr + "\");\n"
 959                 out_c = out_c + "\tCHECK(calls->" + fn_name + "_meth != NULL);\n"
 960
 961         for var in flattened_field_vars:
 962             if isinstance(var, ConvInfo) and var.arg_conv is not None:
 963                 out_c = out_c + "\n\t" + var.arg_conv.replace("\n", "\n\t") +"\n"
 964         out_c = out_c + "\n\t" + struct_name + " ret = {\n"
 965         out_c = out_c + "\t\t.this_arg = (void*) calls,\n"
 966         for fn_line in field_fns:
 967             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 968                 out_c = out_c + "\t\t." + fn_line.fn_name + " = " + fn_line.fn_name + "_" + struct_name + "_jcall,\n"
 969             elif fn_line.fn_name == "free":
 970                 out_c = out_c + "\t\t.free = " + struct_name + "_JCalls_free,\n"
 971             else:
 972                 out_c = out_c + "\t\t.cloned = " + struct_name + "_JCalls_cloned,\n"
 973         for var in field_vars:
 974             if isinstance(var, ConvInfo):
 975                 if var.arg_conv_name is not None:
 976                     out_c = out_c + "\t\t." + var.arg_name + " = " + var.arg_conv_name + ",\n"
 977                     out_c = out_c + "\t\t.set_" + var.arg_name + " = NULL,\n"
 978                 else:
 979                     out_c = out_c + "\t\t." + var.var_name + " = " + var.var_name + ",\n"
 980                     out_c = out_c + "\t\t.set_" + var.var_name + " = NULL,\n"
 981             else:
 982                 out_c += "\t\t." + var[1] + " = " + var[0] + "_init(env, clz, " + var[1]
 983                 for suparg in var[2]:
 984                     if isinstance(suparg, ConvInfo):
 985                         out_c = out_c + ", " + suparg.arg_name
 986                     else:
 987                         out_c = out_c + ", " + suparg[1]
 988                 out_c += "),\n"
 989         out_c = out_c + "\t};\n"
 990         for var in flattened_field_vars:
 991             if not isinstance(var, ConvInfo):
 992                 out_c = out_c + "\tcalls->" + var[1] + " = ret." + var[1] + ".this_arg;\n"
 993         out_c = out_c + "\treturn ret;\n"
 994         out_c = out_c + "}\n"
 995
 996         out_c = out_c + self.c_fn_ty_pfx + "int64_t " + self.c_fn_name_define_pfx(struct_name + "_new", True) + "jobject o"
 997         for var in flattened_field_vars:
 998             if isinstance(var, ConvInfo):
 999                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
1000             else:
1001                 out_c = out_c + ", jobject " + var[1]
1002         out_c = out_c + ") {\n"
1003         out_c = out_c + "\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n"
1004         out_c = out_c + "\t*res_ptr = " + struct_name + "_init(env, clz, o"
1005         for var in flattened_field_vars:
1006             if isinstance(var, ConvInfo):
1007                 out_c = out_c + ", " + var.arg_name
1008             else:
1009                 out_c = out_c + ", " + var[1]
1010         out_c = out_c + ");\n"
1011         out_c = out_c + "\treturn (uint64_t)res_ptr;\n"
1012         out_c = out_c + "}\n"
1013
1014         for var in flattened_field_vars:
1015             if not isinstance(var, ConvInfo):
1016                 out_java_trait += "\n\t/**\n"
1017                 out_java_trait += "\t * Gets the underlying " + var[1] + ".\n"
1018                 out_java_trait += "\t */\n"
1019                 underscore_name = ''.join('_' + c.lower() if c.isupper() else c for c in var[1]).strip('_')
1020                 out_java_trait += "\tpublic " + var[1] + " get_" + underscore_name + "() {\n"
1021                 out_java_trait += "\t\t" + var[1] + " res = new " + var[1] + "(null, bindings." + struct_name + "_get_" + var[1] + "(this.ptr));\n"
1022                 out_java_trait += "\t\tthis.ptrs_to.add(res);\n"
1023                 out_java_trait += "\t\treturn res;\n"
1024                 out_java_trait += "\t}\n"
1025                 out_java_trait += "\n"
1026
1027                 out_java += "\tpublic static native long " + struct_name + "_get_" + var[1] + "(long arg);\n"
1028
1029                 out_c += "JNIEXPORT int64_t JNICALL Java_org_ldk_impl_bindings_" + struct_name + "_1get_1" + var[1] + "(JNIEnv *env, jclass clz, int64_t arg) {\n"
1030                 out_c += "\t" + struct_name + " *inp = (" + struct_name + " *)(arg & ~1);\n"
1031                 out_c += "\tuint64_t res_ptr = (uint64_t)&inp->" + var[1] + ";\n"
1032                 out_c += "\tDO_ASSERT((res_ptr & 1) == 0);\n"
1033                 out_c += "\treturn (int64_t)(res_ptr | 1);\n"
1034                 out_c += "}\n"
1035
1036         return (out_java, out_java_trait, out_c)
1037
1038     def trait_struct_inc_refcnt(self, ty_info):
1039         base_conv = "\nif (" + ty_info.var_name + "_conv.free == " + ty_info.rust_obj + "_JCalls_free) {\n"
1040         base_conv = base_conv + "\t// If this_arg is a JCalls struct, then we need to increment the refcnt in it.\n"
1041         base_conv = base_conv + "\t" + ty_info.rust_obj + "_JCalls_cloned(&" + ty_info.var_name + "_conv);\n}"
1042         return base_conv
1043
1044     def map_complex_enum(self, struct_name, variant_list, camel_to_snake, enum_doc_comment):
1045         java_hu_type = struct_name.replace("LDK", "").replace("COption", "Option")
1046         out_java_enum = ""
1047         out_java = ""
1048         out_c = ""
1049
1050         out_java_enum += (self.hu_struct_file_prefix)
1051         out_java_enum += "\n/**\n * " + enum_doc_comment.replace("\n", "\n * ") + "\n */\n"
1052         out_java_enum += "@SuppressWarnings(\"unchecked\") // We correctly assign various generic arrays\n"
1053         out_java_enum += ("public class " + java_hu_type + " extends CommonBase {\n")
1054         out_java_enum += ("\tprivate " + java_hu_type + "(Object _dummy, long ptr) { super(ptr); }\n")
1055         out_java_enum += ("\t@Override @SuppressWarnings(\"deprecation\")\n")
1056         out_java_enum += ("\tprotected void finalize() throws Throwable {\n")
1057         out_java_enum += ("\t\tsuper.finalize();\n")
1058         out_java_enum += ("\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK", "") + "_free(ptr); }\n")
1059         out_java_enum += ("\t}\n")
1060         out_java_enum += ("\tstatic " + java_hu_type + " constr_from_ptr(long ptr) {\n")
1061         out_java_enum += ("\t\tbindings." + struct_name + " raw_val = bindings." + struct_name + "_ref_from_ptr(ptr);\n")
1062         java_hu_subclasses = ""
1063
1064         init_meth_jty_strs = {}
1065
1066         out_java +=  ("\tpublic static class " + struct_name + " {\n")
1067         out_java +=  ("\t\tprivate " + struct_name + "() {}\n")
1068         for var in variant_list:
1069             out_java +=  ("\t\tpublic final static class " + var.var_name + " extends " + struct_name + " {\n")
1070             if var.var_docs is not None:
1071                 java_hu_subclasses += "\t/**\n\t * " + var.var_docs.replace("\n", "\n\t * ") + "\n\t */\n"
1072             java_hu_subclasses += "\tpublic final static class " + var.var_name + " extends " + java_hu_type + " {\n"
1073             out_java_enum += ("\t\tif (raw_val.getClass() == bindings." + struct_name + "." + var.var_name + ".class) {\n")
1074             out_java_enum += ("\t\t\treturn new " + var.var_name + "(ptr, (bindings." + struct_name + "." + var.var_name + ")raw_val);\n")
1075             init_meth_jty_str = ""
1076             init_meth_params = ""
1077             init_meth_body = ""
1078             hu_conv_body = ""
1079             for idx, (field_ty, field_docs) in enumerate(var.fields):
1080                 if idx > 0:
1081                     init_meth_params = init_meth_params + ", "
1082
1083                 if field_ty.java_hu_ty == var.var_name:
1084                     field_path = field_ty.java_fn_ty_arg.strip("L;").replace("/", ".")
1085                     out_java += "\t\t\tpublic " + field_path + " " + field_ty.arg_name + ";\n"
1086                     java_hu_subclasses = java_hu_subclasses + "\t\tpublic final " + field_path + " " + field_ty.arg_name + ";\n"
1087                     init_meth_params = init_meth_params + field_path + " " + field_ty.arg_name
1088                 else:
1089                     out_java += "\t\t\tpublic " + field_ty.java_ty + " " + field_ty.arg_name + ";\n"
1090                     if field_docs is not None:
1091                         java_hu_subclasses += "\t\t/**\n\t\t * " + field_docs.replace("\n", "\n\t\t * ") + "\n\t\t*/\n"
1092                     java_hu_subclasses += "\t\t"
1093                     if field_ty.nullable:
1094                         java_hu_subclasses += "@Nullable "
1095                     java_hu_subclasses += "public final " + field_ty.java_hu_ty + " " + field_ty.arg_name + ";\n"
1096                     init_meth_params = init_meth_params + field_ty.java_ty + " " + field_ty.arg_name
1097                 init_meth_body = init_meth_body + "this." + field_ty.arg_name + " = " + field_ty.arg_name + "; "
1098                 if field_ty.to_hu_conv is not None:
1099                     hu_conv_body = hu_conv_body + "\t\t\t" + field_ty.java_ty + " " + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
1100                     hu_conv_body = hu_conv_body + "\t\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
1101                     hu_conv_body = hu_conv_body + "\t\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
1102                 else:
1103                     hu_conv_body = hu_conv_body + "\t\t\tthis." + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
1104                 init_meth_jty_str = init_meth_jty_str + field_ty.java_fn_ty_arg
1105             out_java +=  ("\t\t\t" + var.var_name + "(" + init_meth_params + ") { ")
1106             out_java +=  (init_meth_body)
1107             out_java +=  ("}\n")
1108             out_java += ("\t\t}\n")
1109             out_java_enum += ("\t\t}\n")
1110             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"
1111             java_hu_subclasses = java_hu_subclasses + hu_conv_body
1112             java_hu_subclasses = java_hu_subclasses + "\t\t}\n\t}\n"
1113             init_meth_jty_strs[var.var_name] = init_meth_jty_str
1114         out_java += ("\t\tstatic native void init();\n")
1115         out_java += ("\t}\n")
1116         out_java_enum += ("\t\tassert false; return null; // Unreachable without extending the (internal) bindings interface\n\t}\n\n")
1117         out_java_enum += (java_hu_subclasses)
1118         out_java += ("\tstatic { " + struct_name + ".init(); }\n")
1119         out_java += ("\tpublic static native " + struct_name + " " + struct_name + "_ref_from_ptr(long ptr);\n");
1120
1121         out_c += (self.c_complex_enum_pfx(struct_name, [x.var_name for x in variant_list], init_meth_jty_strs))
1122
1123         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")
1124         out_c += ("\t" + struct_name + " *obj = (" + struct_name + "*)(ptr & ~1);\n")
1125         out_c += ("\tswitch(obj->tag) {\n")
1126         for var in variant_list:
1127             out_c += ("\t\tcase " + struct_name + "_" + var.var_name + ": {\n")
1128             c_params = []
1129             for idx, (field_map, field_docs) in enumerate(var.fields):
1130                 if field_map.ret_conv is not None:
1131                     out_c += ("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
1132                     if var.tuple_variant:
1133                         out_c += "obj->" + camel_to_snake(var.var_name)
1134                     else:
1135                         out_c += "obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name
1136                     out_c += (field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
1137                     c_params.append(field_map.ret_conv_name)
1138                 else:
1139                     if var.tuple_variant:
1140                         c_params.append("obj->" + camel_to_snake(var.var_name))
1141                     else:
1142                         c_params.append("obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name)
1143             out_c += ("\t\t\treturn " + self.c_constr_native_complex_enum(struct_name, var.var_name, c_params) + ";\n")
1144             out_c += ("\t\t}\n")
1145         out_c += ("\t\tdefault: abort();\n")
1146         out_c += ("\t}\n}\n")
1147         return (out_java, out_java_enum, out_c)
1148
1149     def map_opaque_struct(self, struct_name, struct_doc_comment):
1150         out_opaque_struct_human = ""
1151         out_opaque_struct_human += self.hu_struct_file_prefix
1152         out_opaque_struct_human += "\n/**\n * " + struct_doc_comment.replace("\n", "\n * ") + "\n */\n"
1153         out_opaque_struct_human += "@SuppressWarnings(\"unchecked\") // We correctly assign various generic arrays\n"
1154         hu_name = struct_name.replace("LDKC2Tuple", "TwoTuple").replace("LDKC3Tuple", "ThreeTuple").replace("LDK", "")
1155         out_opaque_struct_human += ("public class " + hu_name + " extends CommonBase")
1156         if struct_name.startswith("LDKLocked"):
1157             out_opaque_struct_human += (" implements AutoCloseable")
1158         out_opaque_struct_human += (" {\n")
1159         out_opaque_struct_human += ("\t" + hu_name + "(Object _dummy, long ptr) { super(ptr); }\n")
1160         if struct_name.startswith("LDKLocked"):
1161             out_opaque_struct_human += ("\t@Override public void close() {\n")
1162         else:
1163             out_opaque_struct_human += ("\t@Override @SuppressWarnings(\"deprecation\")\n")
1164             out_opaque_struct_human += ("\tprotected void finalize() throws Throwable {\n")
1165             out_opaque_struct_human += ("\t\tsuper.finalize();\n")
1166         out_opaque_struct_human += ("\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); }\n")
1167         out_opaque_struct_human += ("\t}\n\n")
1168         return out_opaque_struct_human
1169
1170     def map_tuple(self, struct_name):
1171         return self.map_opaque_struct(struct_name, "A Tuple")
1172
1173     def map_function(self, argument_types, c_call_string, method_name, meth_n, return_type_info, struct_meth, default_constructor_args, takes_self, takes_self_as_ref, args_known, type_mapping_generator, doc_comment):
1174         out_java = ""
1175         out_c = ""
1176         out_java_struct = None
1177
1178         out_java += ("\tpublic static native ")
1179         out_c += (self.c_fn_ty_pfx)
1180         out_c += (return_type_info.c_ty)
1181         out_java += (return_type_info.java_ty)
1182         if return_type_info.ret_conv is not None:
1183             ret_conv_pfx, ret_conv_sfx = return_type_info.ret_conv
1184         out_java += (" " + method_name + "(")
1185         have_args = len(argument_types) > 1 or (len(argument_types) > 0 and argument_types[0].c_ty != "void")
1186         out_c += (" " + self.c_fn_name_define_pfx(method_name, have_args))
1187
1188         for idx, arg_conv_info in enumerate(argument_types):
1189             if idx != 0:
1190                 out_java += (", ")
1191                 out_c += (", ")
1192             if arg_conv_info.c_ty != "void":
1193                 out_c += (arg_conv_info.c_ty + " " + arg_conv_info.arg_name)
1194                 out_java += (arg_conv_info.java_ty + " " + arg_conv_info.arg_name)
1195
1196         out_java_struct = ""
1197         extra_java_struct_out = ""
1198         if not args_known:
1199             out_java_struct += ("\t// Skipped " + method_name + "\n")
1200         else:
1201             if doc_comment is not None:
1202                 out_java_struct += "\t/**\n\t * " + doc_comment.replace("\n", "\n\t * ") + "\n\t */\n"
1203             if return_type_info.nullable:
1204                 out_java_struct += "\t@Nullable\n"
1205             if not takes_self:
1206                 if meth_n == "new":
1207                     out_java_struct += "\tpublic static " + return_type_info.java_hu_ty + " of("
1208                 elif meth_n == "default":
1209                     out_java_struct += "\tpublic static " + return_type_info.java_hu_ty + " with_default("
1210                 else:
1211                     out_java_struct += "\tpublic static " + return_type_info.java_hu_ty + " " + meth_n + "("
1212             elif meth_n == "clone_ptr":
1213                 out_java_struct += ("\t" + return_type_info.java_hu_ty + " " + meth_n + "(")
1214             else:
1215                 if meth_n == "hash" and return_type_info.java_hu_ty == "long":
1216                     extra_java_struct_out = "\t@Override public int hashCode() {\n"
1217                     extra_java_struct_out += "\t\treturn (int)this.hash();\n"
1218                     extra_java_struct_out += "\t}\n"
1219                 elif meth_n == "eq" and return_type_info.java_hu_ty == "boolean":
1220                     extra_java_struct_out = "\t@Override public boolean equals(Object o) {\n"
1221                     extra_java_struct_out += "\t\tif (!(o instanceof " + struct_meth + ")) return false;\n"
1222                     extra_java_struct_out += "\t\treturn this.eq((" + struct_meth + ")o);\n"
1223                     extra_java_struct_out += "\t}\n"
1224                 out_java_struct += ("\tpublic " + return_type_info.java_hu_ty + " " + meth_n + "(")
1225             for idx, arg in enumerate(argument_types):
1226                 if idx != 0:
1227                     if not takes_self or idx > 1:
1228                         out_java_struct += ", "
1229                 elif takes_self:
1230                     continue
1231                 if arg.java_ty != "void":
1232                     if arg.arg_name in default_constructor_args:
1233                         assert not arg.nullable
1234                         for explode_idx, explode_arg in enumerate(default_constructor_args[arg.arg_name]):
1235                             if explode_idx != 0:
1236                                 out_java_struct += (", ")
1237                             out_java_struct += (
1238                                 explode_arg.java_hu_ty + " " + arg.arg_name + "_" + explode_arg.arg_name)
1239                     else:
1240                         if arg.nullable:
1241                             out_java_struct += "@Nullable "
1242                         ty_string = arg.java_hu_ty
1243                         if arg.java_fn_ty_arg[0] == "L" and arg.java_fn_ty_arg[len(arg.java_fn_ty_arg) - 1] == ";":
1244                             ty_string = arg.java_fn_ty_arg.strip("L;").replace("/", ".")
1245                         out_java_struct += ty_string + " " + arg.arg_name
1246         out_java += (");\n")
1247         out_c += (") {\n")
1248         if out_java_struct is not None:
1249             out_java_struct += (") {\n")
1250         for info in argument_types:
1251             if info.arg_conv is not None:
1252                 out_c += ("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
1253         if return_type_info.ret_conv is not None:
1254             out_c += ("\t" + ret_conv_pfx.replace('\n', '\n\t'))
1255         elif return_type_info.c_ty != "void":
1256             out_c += ("\t" + return_type_info.c_ty + " ret_val = ")
1257         else:
1258             out_c += ("\t")
1259         if c_call_string is None:
1260             out_c += (method_name + "(")
1261         else:
1262             out_c += (c_call_string)
1263         for idx, info in enumerate(argument_types):
1264             if info.arg_conv_name is not None:
1265                 if idx != 0:
1266                     out_c += (", ")
1267                 elif c_call_string is not None:
1268                     continue
1269                 out_c += (info.arg_conv_name)
1270         out_c += (")")
1271         if return_type_info.ret_conv is not None:
1272             out_c += (ret_conv_sfx.replace('\n', '\n\t'))
1273         else:
1274             out_c += (";")
1275         for info in argument_types:
1276             if info.arg_conv_cleanup is not None:
1277                 out_c += ("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
1278         if return_type_info.ret_conv is not None:
1279             out_c += ("\n\treturn " + return_type_info.ret_conv_name + ";")
1280         elif return_type_info.c_ty != "void":
1281             out_c += ("\n\treturn ret_val;")
1282         out_c += ("\n}\n\n")
1283
1284         if args_known:
1285             out_java_struct += ("\t\t")
1286             if return_type_info.java_ty != "void":
1287                 out_java_struct += (return_type_info.java_ty + " ret = ")
1288             out_java_struct += ("bindings." + method_name + "(")
1289             for idx, info in enumerate(argument_types):
1290                 if idx != 0:
1291                     out_java_struct += (", ")
1292                 if idx == 0 and takes_self:
1293                     out_java_struct += ("this.ptr")
1294                 elif info.arg_name in default_constructor_args:
1295                     out_java_struct += ("bindings." + info.java_hu_ty + "_new(")
1296                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
1297                         if explode_idx != 0:
1298                             out_java_struct += (", ")
1299                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1300                         if explode_arg.from_hu_conv is not None:
1301                             out_java_struct += (
1302                                 explode_arg.from_hu_conv[0].replace(explode_arg.arg_name, expl_arg_name))
1303                         else:
1304                             out_java_struct += (expl_arg_name)
1305                     out_java_struct += (")")
1306                 elif info.from_hu_conv is not None:
1307                     out_java_struct += (info.from_hu_conv[0])
1308                 else:
1309                     out_java_struct += (info.arg_name)
1310             out_java_struct += (");\n")
1311
1312             # This is completely nuts. The OpenJDK JRE JIT will optimize out a object which is on
1313             # the stack, calling its finalizer immediately even if member methods are *actively
1314             # executing* on the same object, as long as said object is on the stack. There is no
1315             # concrete specification for when the optimizer is allowed to do this, and when it is
1316             # not, so there is absolutely no way to be certain that this fix suffices.
1317             #
1318             # Instead, the "Java Language Specification" says only that an object is reachable
1319             # (i.e. will not yet be finalized) if it "can be accessed in any potential continuing
1320             # computation from any live thread". To any sensible reader this would mean actively
1321             # executing a member function on an object would make it not eligible for finalization.
1322             # But, no, dear reader, this statement does not say that. Well, okay, it says that,
1323             # very explicitly in fact, but those are just, like, words, man.
1324             #
1325             # In the seemingly non-normative text further down, a few examples of things the
1326             # optimizer can do are given, including "if the values in an object's fields are
1327             # stored in registers[, t]he may then access the registers instead of the object, and
1328             # never access the object again[, implying] that the object is garbage". This appears
1329             # to fully contradict both the above statement, the API documentation in java.lang.ref
1330             # regarding when a reference is "strongly reachable", and basic common sense. There is
1331             # no concrete set of limitations stated, however, seemingly implying the JIT could
1332             # decide your code would run faster by simply garbage collecting everything
1333             # immediately, ensuring your code finishes soon, just by SEGFAULT. Thus, we're really
1334             # entirely flying blind here. We add some fences and hope that its sufficient, but
1335             # with no specification to rely on, we cannot be certain of anything.
1336             #
1337             # TL;DR: The Java Language "Specification" provides no real guarantees on when an
1338             # object will be considered available for garbage collection once the JIT kicks in, so
1339             # we put in some fences and hope to god the JIT doesn't get smarter/more broken.
1340             for idx, info in enumerate(argument_types):
1341                 if idx == 0 and takes_self:
1342                     out_java_struct += ("\t\tReference.reachabilityFence(this);\n")
1343                 elif info.arg_name in default_constructor_args:
1344                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
1345                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1346                         out_java_struct += ("\t\tReference.reachabilityFence(" + expl_arg_name + ");\n")
1347                 elif info.c_ty != "void":
1348                     out_java_struct += ("\t\tReference.reachabilityFence(" + info.arg_name + ");\n")
1349
1350             if return_type_info.java_ty == "long" and return_type_info.java_hu_ty != "long":
1351                 out_java_struct += "\t\tif (ret >= 0 && ret <= 4096) { return null; }\n"
1352
1353             if return_type_info.to_hu_conv is not None:
1354                 if not takes_self:
1355                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t").replace("this",
1356                                                                                                                return_type_info.to_hu_conv_name) + "\n")
1357                 else:
1358                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t") + "\n")
1359
1360             for idx, info in enumerate(argument_types):
1361                 if idx == 0 and takes_self:
1362                     pass
1363                 elif info.arg_name in default_constructor_args:
1364                     for explode_arg in default_constructor_args[info.arg_name]:
1365                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1366                         if explode_arg.from_hu_conv is not None and return_type_info.to_hu_conv_name:
1367                             out_java_struct += ("\t\t" + explode_arg.from_hu_conv[1].replace(explode_arg.arg_name,
1368                                                                                                expl_arg_name).replace(
1369                                 "this", return_type_info.to_hu_conv_name) + ";\n")
1370                 elif info.from_hu_conv is not None and info.from_hu_conv[1] != "":
1371                     if not takes_self and return_type_info.to_hu_conv_name is not None:
1372                         out_java_struct += (
1373                             "\t\t" + info.from_hu_conv[1].replace("this", return_type_info.to_hu_conv_name).replace("\n", "\n\t\t") + ";\n")
1374                     else:
1375                         out_java_struct += ("\t\t" + info.from_hu_conv[1].replace("\n", "\n\t\t") + ";\n")
1376
1377             if takes_self and not takes_self_as_ref:
1378                 out_java_struct += "\t\t" + argument_types[0].from_hu_conv[1].replace("\n", "\n\t\t").replace("this_arg", "this") + ";\n"
1379             if return_type_info.to_hu_conv_name is not None:
1380                 out_java_struct += ("\t\treturn " + return_type_info.to_hu_conv_name + ";\n")
1381             elif return_type_info.java_ty != "void" and return_type_info.rust_obj != "LDK" + struct_meth:
1382                 out_java_struct += ("\t\treturn ret;\n")
1383             out_java_struct += ("\t}\n\n")
1384
1385         return (out_java, out_c, out_java_struct + extra_java_struct_out)