-
Notifications
You must be signed in to change notification settings - Fork 1.7k
/
callback.c
477 lines (443 loc) · 15.2 KB
/
callback.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
/* Copyright (c) 2007-2011 Timothy Wall, All Rights Reserved
* Copyright (c) 2007 Wayne Meissner, All Rights Reserved
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
* <p/>
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*/
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <jni.h>
#if defined(_WIN32)
# define WIN32_LEAN_AND_MEAN
# include <windows.h>
#else
# include <sys/types.h>
# include <sys/param.h>
#endif
#include "dispatch.h"
#ifdef __cplusplus
extern "C" {
#endif
static void callback_dispatch(ffi_cif*, void*, void**, void*);
static jclass classObject;
callback*
create_callback(JNIEnv* env, jobject obj, jobject method,
jobjectArray param_types, jclass return_type,
callconv_t calling_convention, jboolean direct) {
callback* cb;
ffi_abi abi = FFI_DEFAULT_ABI;
ffi_abi java_abi = FFI_DEFAULT_ABI;
ffi_type* ffi_rtype;
ffi_status status;
jsize argc;
JavaVM* vm;
int rtype;
char msg[64];
int i;
int cvt = 0;
const char* throw_type = NULL;
const char* throw_msg = NULL;
if ((*env)->GetJavaVM(env, &vm) != JNI_OK) {
throwByName(env, EUnsatisfiedLink, "Can't get Java VM to create native callback");
return NULL;
}
argc = (*env)->GetArrayLength(env, param_types);
cb = (callback *)malloc(sizeof(callback));
cb->closure = ffi_closure_alloc(sizeof(ffi_closure), &cb->x_closure);
cb->object = (*env)->NewWeakGlobalRef(env, obj);
cb->methodID = (*env)->FromReflectedMethod(env, method);
cb->vm = vm;
cb->arg_types = (ffi_type**)malloc(sizeof(ffi_type*) * argc);
cb->java_arg_types = (ffi_type**)malloc(sizeof(ffi_type*) * (argc + 3));
cb->arg_jtypes = (char*)malloc(sizeof(char) * argc);
cb->flags = (int *)malloc(sizeof(int) * argc);
cb->rflag = CVT_DEFAULT;
cb->arg_classes = (jobject*)malloc(sizeof(jobject) * argc);
cb->direct = direct;
cb->java_arg_types[0] = cb->java_arg_types[1] = cb->java_arg_types[2] = &ffi_type_pointer;
for (i=0;i < argc;i++) {
int jtype;
jclass cls = (*env)->GetObjectArrayElement(env, param_types, i);
if ((cb->flags[i] = get_conversion_flag(env, cls)) != CVT_DEFAULT) {
cb->arg_classes[i] = (*env)->NewWeakGlobalRef(env, cls);
cvt = 1;
}
jtype = get_jtype(env, cls);
if (jtype == -1) {
snprintf(msg, sizeof(msg), "Unsupported callback argument at index %d", i);
throw_type = EIllegalArgument;
throw_msg = msg;
goto failure_cleanup;
}
cb->arg_jtypes[i] = (char)jtype;
cb->java_arg_types[i+3] = cb->arg_types[i] = get_ffi_type(env, cls, cb->arg_jtypes[i]);
if (cb->flags[i] == CVT_NATIVE_MAPPED
|| cb->flags[i] == CVT_POINTER_TYPE
|| cb->flags[i] == CVT_INTEGER_TYPE) {
jclass ncls;
ncls = getNativeType(env, cls);
jtype = get_jtype(env, ncls);
if (jtype == -1) {
snprintf(msg, sizeof(msg), "Unsupported NativeMapped callback argument native type at argument %d", i);
throw_type = EIllegalArgument;
throw_msg = msg;
goto failure_cleanup;
}
cb->arg_jtypes[i] = (char)jtype;
cb->java_arg_types[i+3] = &ffi_type_pointer;
cb->arg_types[i] = get_ffi_type(env, ncls, cb->arg_jtypes[i]);
}
if (cb->arg_types[i]->type == FFI_TYPE_FLOAT) {
// Java method is varargs, so promote floats to double
cb->java_arg_types[i+3] = &ffi_type_double;
cb->flags[i] = CVT_FLOAT;
cvt = 1;
}
else if (cb->java_arg_types[i+3]->type == FFI_TYPE_STRUCT) {
// All callback structure arguments are passed as a jobject
cb->java_arg_types[i+3] = &ffi_type_pointer;
}
}
if (!direct || !cvt) {
free(cb->flags);
cb->flags = NULL;
free(cb->arg_classes);
cb->arg_classes = NULL;
}
if (direct) {
cb->rflag = get_conversion_flag(env, return_type);
if (cb->rflag == CVT_NATIVE_MAPPED
|| cb->rflag == CVT_INTEGER_TYPE
|| cb->rflag == CVT_POINTER_TYPE) {
return_type = getNativeType(env, return_type);
}
}
#if defined(_WIN32) && !defined(_WIN64) && !defined(_WIN32_WCE)
if (calling_convention == CALLCONV_STDCALL) {
abi = FFI_STDCALL;
}
java_abi = FFI_STDCALL;
#endif // _WIN32
rtype = get_jtype(env, return_type);
if (rtype == -1) {
throw_type = EIllegalArgument;
throw_msg = "Unsupported callback return type";
goto failure_cleanup;
}
ffi_rtype = get_ffi_rtype(env, return_type, (char)rtype);
if (!ffi_rtype) {
throw_type = EIllegalArgument;
throw_msg = "Error in callback return type";
goto failure_cleanup;
}
status = ffi_prep_cif(&cb->cif, abi, argc, ffi_rtype, cb->arg_types);
if (!ffi_error(env, "callback setup", status)) {
ffi_type* java_ffi_rtype = ffi_rtype;
if (cb->rflag == CVT_STRUCTURE_BYVAL
|| cb->rflag == CVT_NATIVE_MAPPED
|| cb->rflag == CVT_POINTER_TYPE
|| cb->rflag == CVT_INTEGER_TYPE) {
// Java method returns a jobject, not a struct
java_ffi_rtype = &ffi_type_pointer;
rtype = '*';
}
switch(rtype) {
case 'V': cb->fptr = (*env)->CallVoidMethod; break;
case 'Z': cb->fptr = (*env)->CallBooleanMethod; break;
case 'B': cb->fptr = (*env)->CallByteMethod; break;
case 'S': cb->fptr = (*env)->CallShortMethod; break;
case 'C': cb->fptr = (*env)->CallCharMethod; break;
case 'I': cb->fptr = (*env)->CallIntMethod; break;
case 'J': cb->fptr = (*env)->CallLongMethod; break;
case 'F': cb->fptr = (*env)->CallFloatMethod; break;
case 'D': cb->fptr = (*env)->CallDoubleMethod; break;
default: cb->fptr = (*env)->CallObjectMethod; break;
}
status = ffi_prep_cif(&cb->java_cif, java_abi, argc+3, java_ffi_rtype, cb->java_arg_types);
if (!ffi_error(env, "callback setup (2)", status)) {
ffi_prep_closure_loc(cb->closure, &cb->cif, callback_dispatch, cb,
cb->x_closure);
return cb;
}
}
failure_cleanup:
free_callback(env, cb);
if (throw_type) {
throwByName(env, throw_type, throw_msg);
}
return NULL;
}
void
free_callback(JNIEnv* env, callback *cb) {
(*env)->DeleteWeakGlobalRef(env, cb->object);
ffi_closure_free(cb->closure);
free(cb->arg_types);
if (cb->arg_classes) {
unsigned i;
for (i=0;i < cb->cif.nargs;i++) {
(*env)->DeleteWeakGlobalRef(env, cb->arg_classes[i]);
}
free(cb->arg_classes);
}
free(cb->java_arg_types);
if (cb->flags)
free(cb->flags);
free(cb->arg_jtypes);
free(cb);
}
static int
handle_exception(JNIEnv* env, jobject cb, jthrowable throwable) {
#define HANDLER_TYPE "com/sun/jna/Callback$UncaughtExceptionHandler"
#define HANDLER_SIG "Lcom/sun/jna/Callback$UncaughtExceptionHandler;"
jclass classHandler = (*env)->FindClass(env, HANDLER_TYPE);
if (classHandler) {
jclass classNative = (*env)->FindClass(env, "com/sun/jna/Native");
if (classNative) {
jfieldID fid = (*env)->GetStaticFieldID(env, classNative, "callbackExceptionHandler", HANDLER_SIG);
if (fid) {
jobject handler = (*env)->GetStaticObjectField(env, classNative, fid);
if (handler) {
jmethodID mid = (*env)->GetMethodID(env, classHandler, "uncaughtException", "(Lcom/sun/jna/Callback;Ljava/lang/Throwable;)V");
if (mid) {
if (!(*env)->IsSameObject(env, handler, NULL)) {
(*env)->CallVoidMethod(env, handler, mid, cb, throwable);
}
if ((*env)->ExceptionCheck(env) == 0) {
return 1;
}
}
}
}
}
}
(*env)->ExceptionDescribe(env);
(*env)->ExceptionClear(env);
return 0;
}
static void
callback_invoke(JNIEnv* env, callback *cb, ffi_cif* cif, void *resp, void **cbargs) {
jobject self;
void *oldresp = resp;
self = (*env)->NewLocalRef(env, cb->object);
// Avoid calling back to a GC'd object
if ((*env)->IsSameObject(env, self, NULL)) {
fprintf(stderr, "JNA: callback object has been garbage collected\n");
if (cif->rtype->type != FFI_TYPE_VOID) {
memset(resp, 0, cif->rtype->size);
}
}
else if (cb->direct) {
unsigned int i;
void **args = alloca((cif->nargs + 3) * sizeof(void *));
args[0] = (void *)&env;
args[1] = &self;
args[2] = &cb->methodID;
memcpy(&args[3], cbargs, cif->nargs * sizeof(void *));
if (cb->flags) {
for (i=0;i < cif->nargs;i++) {
switch(cb->flags[i]) {
case CVT_INTEGER_TYPE:
case CVT_POINTER_TYPE:
case CVT_NATIVE_MAPPED:
*((void **)args[i+3]) = fromNative(env, cb->arg_classes[i], cif->arg_types[i], args[i+3], JNI_FALSE);
break;
case CVT_POINTER:
*((void **)args[i+3]) = newJavaPointer(env, *(void **)args[i+3]);
break;
case CVT_STRING:
*((void **)args[i+3]) = newJavaString(env, *(void **)args[i+3], JNI_FALSE);
break;
case CVT_WSTRING:
*((void **)args[i+3]) = newJavaWString(env, *(void **)args[i+3]);
break;
case CVT_STRUCTURE:
*((void **)args[i+3]) = newJavaStructure(env, *(void **)args[i+3], cb->arg_classes[i], JNI_FALSE);
break;
case CVT_STRUCTURE_BYVAL:
{
void *ptr = args[i+3];
args[i+3] = alloca(sizeof(void *));
*((void **)args[i+3]) = newJavaStructure(env, ptr, cb->arg_classes[i], JNI_TRUE);
}
break;
case CVT_CALLBACK:
*((void **)args[i+3]) = newJavaCallback(env, *(void **)args[i+3], cb->arg_classes[i]);
break;
case CVT_FLOAT:
{
void *ptr = alloca(sizeof(double));
*(double *)ptr = *(float*)args[i+3];
args[i+3] = ptr;
}
break;
}
}
}
if (cb->rflag == CVT_STRUCTURE_BYVAL) {
resp = alloca(sizeof(jobject));
}
else if (cb->cif.rtype->size > cif->rtype->size) {
resp = alloca(cb->cif.rtype->size);
}
ffi_call(&cb->java_cif, FFI_FN(cb->fptr), resp, args);
if ((*env)->ExceptionCheck(env)) {
jthrowable throwable = (*env)->ExceptionOccurred(env);
(*env)->ExceptionClear(env);
if (!handle_exception(env, self, throwable)) {
fprintf(stderr, "JNA: error handling callback exception, continuing\n");
}
if (cif->rtype->type != FFI_TYPE_VOID)
memset(oldresp, 0, cif->rtype->size);
}
else switch(cb->rflag) {
case CVT_INTEGER_TYPE:
if (cb->cif.rtype->size > sizeof(ffi_arg)) {
*(jlong *)oldresp = getIntegerTypeValue(env, *(void **)resp);
}
else {
*(ffi_arg *)oldresp = (ffi_arg)getIntegerTypeValue(env, *(void **)resp);
}
break;
case CVT_POINTER_TYPE:
*(void **)resp = getPointerTypeAddress(env, *(void **)resp);
break;
case CVT_NATIVE_MAPPED:
toNative(env, *(void **)resp, oldresp, cb->cif.rtype->size, JNI_TRUE);
break;
case CVT_POINTER:
*(void **)resp = getNativeAddress(env, *(void **)resp);
break;
case CVT_STRING:
*(void **)resp = getNativeString(env, *(void **)resp, JNI_FALSE);
break;
case CVT_WSTRING:
*(void **)resp = getNativeString(env, *(void **)resp, JNI_TRUE);
break;
case CVT_STRUCTURE:
writeStructure(env, *(void **)resp);
*(void **)resp = getStructureAddress(env, *(void **)resp);
break;
case CVT_STRUCTURE_BYVAL:
writeStructure(env, *(void **)resp);
memcpy(oldresp, getStructureAddress(env, *(void **)resp), cb->cif.rtype->size);
break;
case CVT_CALLBACK:
*(void **)resp = getCallbackAddress(env, *(void **)resp);
break;
default: break;
}
if (cb->flags) {
for (i=0;i < cif->nargs;i++) {
if (cb->flags[i] == CVT_STRUCTURE) {
writeStructure(env, *(void **)args[i+3]);
}
}
}
}
else {
jobject result;
jobjectArray array =
(*env)->NewObjectArray(env, cif->nargs, classObject, NULL);
unsigned int i;
for (i=0;i < cif->nargs;i++) {
jobject arg = new_object(env, cb->arg_jtypes[i], cbargs[i], JNI_FALSE);
(*env)->SetObjectArrayElement(env, array, i, arg);
}
result = (*env)->CallObjectMethod(env, self, cb->methodID, array);
if ((*env)->ExceptionCheck(env)) {
jthrowable throwable = (*env)->ExceptionOccurred(env);
(*env)->ExceptionClear(env);
if (!handle_exception(env, self, throwable)) {
fprintf(stderr, "JNA: error handling callback exception, continuing\n");
}
if (cif->rtype->type != FFI_TYPE_VOID)
memset(resp, 0, cif->rtype->size);
}
else {
extract_value(env, result, resp, cif->rtype->size, JNI_TRUE);
}
}
}
static void
callback_dispatch(ffi_cif* cif, void* resp, void** cbargs, void* user_data) {
callback* cb = ((callback *)user_data);
JavaVM* jvm = cb->vm;
JNIEnv* env;
int was_attached = (*jvm)->GetEnv(jvm, (void *)&env, JNI_VERSION_1_4) == JNI_OK;
jboolean detach = was_attached ? JNI_FALSE : JNI_TRUE;
if (!was_attached) {
int attach_status = 0;
JavaVMAttachArgs args;
int daemon = JNI_FALSE;
args.version = JNI_VERSION_1_2;
args.name = NULL;
args.group = NULL;
if (cb->behavior_flags & CB_HAS_INITIALIZER) {
AttachOptions options;
options.daemon = JNI_FALSE; // default non-daemon
options.detach = JNI_TRUE; // default detach behavior
options.name = NULL;
args.group = initializeThread(cb, &options);
daemon = options.daemon ? JNI_TRUE : JNI_FALSE;
detach = options.detach ? JNI_TRUE : JNI_FALSE;
args.name = options.name;
}
if (daemon) {
attach_status = (*jvm)->AttachCurrentThreadAsDaemon(jvm, (void*)&env, &args);
}
else {
attach_status = (*jvm)->AttachCurrentThread(jvm, (void *)&env, &args);
}
if (attach_status != JNI_OK) {
fprintf(stderr, "JNA: Can't attach native thread to VM for callback: %d\n", attach_status);
return;
}
if (args.group) {
(*env)->DeleteWeakGlobalRef(env, args.group);
}
}
// Give the callback glue its own local frame to ensure all local references
// are properly disposed
if ((*env)->PushLocalFrame(env, 16) < 0) {
fprintf(stderr, "JNA: Out of memory: Can't allocate local frame");
}
else {
// Kind of a hack, use last error value rather than setting up our own TLS
setLastError(0);
callback_invoke(env, cb, cif, resp, cbargs);
// Must be invoked immediately after return to avoid anything
// stepping on errno/GetLastError
switch(lastError()) {
case THREAD_LEAVE_ATTACHED: detach = JNI_FALSE; break;
case THREAD_DETACH: detach = JNI_TRUE; break;
default: break; /* use default detach behavior */
}
(*env)->PopLocalFrame(env, NULL);
}
if (detach) {
(*jvm)->DetachCurrentThread(jvm);
}
}
const char*
jnidispatch_callback_init(JNIEnv* env) {
if (!LOAD_CREF(env, Object, "java/lang/Object")) return "java.lang.Object";
return NULL;
}
void
jnidispatch_callback_dispose(JNIEnv* env) {
if (classObject) {
(*env)->DeleteWeakGlobalRef(env, classObject);
classObject = NULL;
}
}
#ifdef __cplusplus
}
#endif