-
Notifications
You must be signed in to change notification settings - Fork 720
/
javanextvmi.cpp
476 lines (407 loc) · 16.9 KB
/
javanextvmi.cpp
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
/*******************************************************************************
* Copyright (c) 2018, 2022 IBM Corp. and others
*
* This program and the accompanying materials are made available under
* the terms of the Eclipse Public License 2.0 which accompanies this
* distribution and is available at https://www.eclipse.org/legal/epl-2.0/
* or the Apache License, Version 2.0 which accompanies this distribution and
* is available at https://www.apache.org/licenses/LICENSE-2.0.
*
* This Source Code may also be made available under the following
* Secondary Licenses when the conditions for such availability set
* forth in the Eclipse Public License, v. 2.0 are satisfied: GNU
* General Public License, version 2 with the GNU Classpath
* Exception [1] and GNU General Public License, version 2 with the
* OpenJDK Assembly Exception [2].
*
* [1] https://www.gnu.org/software/classpath/license.html
* [2] https://openjdk.org/legal/assembly-exception.html
*
* SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0 WITH Classpath-exception-2.0 OR LicenseRef-GPL-2.0 WITH Assembly-exception
*******************************************************************************/
#include <assert.h>
#include <jni.h>
#include "bcverify_api.h"
#include "j9.h"
#include "j9cfg.h"
#include "rommeth.h"
#include "ut_j9scar.h"
#if JAVA_SPEC_VERSION >= 19
#include "VMHelpers.hpp"
#endif /* JAVA_SPEC_VERSION >= 19 */
extern "C" {
#if JAVA_SPEC_VERSION >= 19
extern J9JavaVM *BFUjavaVM;
/* These come from jvm.c */
extern IDATA (*f_monitorEnter)(omrthread_monitor_t monitor);
extern IDATA (*f_monitorExit)(omrthread_monitor_t monitor);
extern IDATA (*f_monitorWait)(omrthread_monitor_t monitor);
extern IDATA (*f_monitorNotifyAll)(omrthread_monitor_t monitor);
#endif /* JAVA_SPEC_VERSION >= 19 */
/* Define for debug
#define DEBUG_BCV
*/
#if JAVA_SPEC_VERSION >= 16
JNIEXPORT void JNICALL
JVM_DefineArchivedModules(JNIEnv *env, jobject obj1, jobject obj2)
{
assert(!"JVM_DefineArchivedModules unimplemented");
}
JNIEXPORT void JNICALL
JVM_LogLambdaFormInvoker(JNIEnv *env, jstring str)
{
assert(!"JVM_LogLambdaFormInvoker unimplemented");
}
JNIEXPORT jboolean JNICALL
JVM_IsDumpingClassList(JNIEnv *env)
{
return JNI_FALSE;
}
#endif /* JAVA_SPEC_VERSION >= 16 */
#if JAVA_SPEC_VERSION >= 11
JNIEXPORT void JNICALL
JVM_InitializeFromArchive(JNIEnv *env, jclass clz)
{
/* A no-op implementation is ok. */
}
#endif /* JAVA_SPEC_VERSION >= 11 */
#if JAVA_SPEC_VERSION >= 14
typedef struct GetStackTraceElementUserData {
J9ROMClass *romClass;
J9ROMMethod *romMethod;
UDATA bytecodeOffset;
} GetStackTraceElementUserData;
static UDATA
getStackTraceElementIterator(J9VMThread *vmThread, void *voidUserData, UDATA bytecodeOffset, J9ROMClass *romClass, J9ROMMethod *romMethod, J9UTF8 *fileName, UDATA lineNumber, J9ClassLoader *classLoader, J9Class* ramClass)
{
UDATA result = J9_STACKWALK_STOP_ITERATING;
if ((NULL != romMethod)
&& J9_ARE_ALL_BITS_SET(romMethod->modifiers, J9AccMethodFrameIteratorSkip)
) {
/* Skip methods with java.lang.invoke.FrameIteratorSkip / jdk.internal.vm.annotation.Hidden / java.lang.invoke.LambdaForm$Hidden annotation */
result = J9_STACKWALK_KEEP_ITERATING;
} else {
GetStackTraceElementUserData *userData = (GetStackTraceElementUserData *)voidUserData;
/* We are done, first non-hidden stack frame is found. */
userData->romClass = romClass;
userData->romMethod = romMethod;
userData->bytecodeOffset = bytecodeOffset;
}
return result;
}
#if defined(DEBUG_BCV)
static void cfdumpBytecodePrintFunction(void *userData, char *format, ...)
{
PORT_ACCESS_FROM_PORT((J9PortLibrary*)userData);
va_list args;
char outputBuffer[512] = {0};
va_start(args, format);
j9str_vprintf(outputBuffer, 512, format, args);
va_end(args);
j9tty_printf(PORTLIB, "%s", outputBuffer);
}
#endif /* defined(DEBUG_BCV) */
JNIEXPORT jstring JNICALL
JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwableObj)
{
J9VMThread *vmThread = (J9VMThread *)env;
J9JavaVM *vm = vmThread->javaVM;
jobject msgObjectRef = NULL;
Trc_SC_GetExtendedNPEMessage_Entry(vmThread, throwableObj);
if (J9_ARE_ANY_BITS_SET(vm->extendedRuntimeFlags2, J9_EXTENDED_RUNTIME2_SHOW_EXTENDED_NPEMSG)) {
J9InternalVMFunctions const * const vmFuncs = vm->internalVMFunctions;
char *npeMsg = NULL;
GetStackTraceElementUserData userData = {0};
/* If -XX:+ShowHiddenFrames option has not been set, skip hidden method frames */
UDATA skipHiddenFrames = J9_ARE_NO_BITS_SET(vm->runtimeFlags, J9_RUNTIME_SHOW_HIDDEN_FRAMES);
Trc_SC_GetExtendedNPEMessage_Entry2(vmThread, throwableObj);
vmFuncs->internalEnterVMFromJNI(vmThread);
userData.bytecodeOffset = UDATA_MAX;
vmFuncs->iterateStackTrace(vmThread, (j9object_t*)throwableObj, getStackTraceElementIterator, &userData, TRUE, skipHiddenFrames);
if ((NULL != userData.romClass)
&& (NULL != userData.romMethod)
&& (UDATA_MAX != userData.bytecodeOffset)
) {
PORT_ACCESS_FROM_VMC(vmThread);
J9NPEMessageData npeMsgData = {0};
#if defined(DEBUG_BCV)
{
U_8 *bytecodes = J9_BYTECODE_START_FROM_ROM_METHOD(userData.romMethod);
U_32 flags = 0;
#if defined(J9VM_ENV_LITTLE_ENDIAN)
flags |= BCT_LittleEndianOutput;
#else /* defined(J9VM_ENV_LITTLE_ENDIAN) */
flags |= BCT_BigEndianOutput;
#endif /* defined(J9VM_ENV_LITTLE_ENDIAN) */
j9bcutil_dumpBytecodes(PORTLIB, userData.romClass, bytecodes, 0, userData.bytecodeOffset, flags, (void *)cfdumpBytecodePrintFunction, PORTLIB, "");
}
#endif /* defined(DEBUG_BCV) */
npeMsgData.npePC = userData.bytecodeOffset;
npeMsgData.vmThread = vmThread;
npeMsgData.romClass = userData.romClass;
npeMsgData.romMethod = userData.romMethod;
npeMsg = vmFuncs->getNPEMessage(&npeMsgData);
if (NULL != npeMsg) {
j9object_t msgObject = vm->memoryManagerFunctions->j9gc_createJavaLangString(vmThread, (U_8 *)npeMsg, strlen(npeMsg), 0);
if (NULL != msgObject) {
msgObjectRef = vmFuncs->j9jni_createLocalRef(env, msgObject);
}
j9mem_free_memory(npeMsg);
}
j9mem_free_memory(npeMsgData.liveStack);
j9mem_free_memory(npeMsgData.bytecodeOffset);
j9mem_free_memory(npeMsgData.bytecodeMap);
j9mem_free_memory(npeMsgData.stackMaps);
j9mem_free_memory(npeMsgData.unwalkedQueue);
} else {
Trc_SC_GetExtendedNPEMessage_Null_NPE_MSG(vmThread, userData.romClass, userData.romMethod, userData.bytecodeOffset);
}
vmFuncs->internalExitVMToJNI(vmThread);
}
Trc_SC_GetExtendedNPEMessage_Exit(vmThread, msgObjectRef);
return (jstring)msgObjectRef;
}
#endif /* JAVA_SPEC_VERSION >= 14 */
#if JAVA_SPEC_VERSION >= 17
JNIEXPORT void JNICALL
JVM_DumpClassListToFile(JNIEnv *env, jstring str)
{
assert(!"JVM_DumpClassListToFile unimplemented");
}
JNIEXPORT void JNICALL
JVM_DumpDynamicArchive(JNIEnv *env, jstring str)
{
assert(!"JVM_DumpDynamicArchive unimplemented");
}
#endif /* JAVA_SPEC_VERSION >= 17 */
#if JAVA_SPEC_VERSION >= 18
JNIEXPORT jboolean JNICALL
JVM_IsFinalizationEnabled(JNIEnv *env)
{
jboolean isFinalizationEnabled = JNI_TRUE;
J9VMThread *currentThread = (J9VMThread*)env;
if (J9_ARE_ANY_BITS_SET(currentThread->javaVM->extendedRuntimeFlags2, J9_EXTENDED_RUNTIME2_DISABLE_FINALIZATION)) {
isFinalizationEnabled = JNI_FALSE;
}
return isFinalizationEnabled;
}
JNIEXPORT void JNICALL
JVM_ReportFinalizationComplete(JNIEnv *env, jobject obj)
{
assert(!"JVM_ReportFinalizationComplete unimplemented");
}
#endif /* JAVA_SPEC_VERSION >= 18 */
#if JAVA_SPEC_VERSION >= 19
JNIEXPORT void JNICALL
JVM_LoadZipLibrary(void)
{
assert(!"JVM_LoadZipLibrary unimplemented");
}
JNIEXPORT void JNICALL
JVM_RegisterContinuationMethods(JNIEnv *env, jclass clz)
{
assert(!"JVM_RegisterContinuationMethods unimplemented");
}
JNIEXPORT jboolean JNICALL
JVM_IsContinuationsSupported(void)
{
return JNI_TRUE;
}
JNIEXPORT jboolean JNICALL
JVM_IsPreviewEnabled(void)
{
jboolean isPreviewEnabled = JNI_FALSE;
J9VMThread *currentThread = BFUjavaVM->internalVMFunctions->currentVMThread(BFUjavaVM);
if (J9_ARE_ANY_BITS_SET(currentThread->javaVM->extendedRuntimeFlags2, J9_EXTENDED_RUNTIME2_ENABLE_PREVIEW)) {
isPreviewEnabled = JNI_TRUE;
}
return isPreviewEnabled;
}
JNIEXPORT void JNICALL
JVM_VirtualThreadMountBegin(JNIEnv *env, jobject thread, jboolean firstMount)
{
J9VMThread *currentThread = (J9VMThread *)env;
J9JavaVM *vm = currentThread->javaVM;
J9InternalVMFunctions *vmFuncs = vm->internalVMFunctions;
vmFuncs->internalEnterVMFromJNI(currentThread);
f_monitorEnter(vm->liveVirtualThreadListMutex);
j9object_t threadObj = J9_JNI_UNWRAP_REFERENCE(thread);
assert(IS_JAVA_LANG_VIRTUALTHREAD(currentThread, threadObj));
while (vm->inspectingLiveVirtualThreadList
|| (0 != J9OBJECT_I64_LOAD(currentThread, threadObj, vm->virtualThreadInspectorCountOffset))
) {
/* Thread is being inspected or unmounted, wait. */
vmFuncs->internalExitVMToJNI(currentThread);
f_monitorWait(vm->liveVirtualThreadListMutex);
/* Release the monitor before suspending. */
f_monitorExit(vm->liveVirtualThreadListMutex);
/* After wait, the thread may suspend here. */
vmFuncs->internalEnterVMFromJNI(currentThread);
/* Acquire the monitor after resuming from suspend. */
f_monitorEnter(vm->liveVirtualThreadListMutex);
threadObj = J9_JNI_UNWRAP_REFERENCE(thread);
}
/* Prevent inspectors from inspecting this thread during stack swap and mount by locking from notifyJvmtiMountBegin
* to notifyJvmtiMountEnd. See getVMThread() in jvmtiHelpers.c.
*/
J9OBJECT_I64_STORE(currentThread, threadObj, vm->virtualThreadInspectorCountOffset, -1);
f_monitorExit(vm->liveVirtualThreadListMutex);
vmFuncs->internalExitVMToJNI(currentThread);
}
JNIEXPORT void JNICALL
JVM_VirtualThreadMountEnd(JNIEnv *env, jobject thread, jboolean firstMount)
{
J9VMThread *currentThread = (J9VMThread *)env;
J9JavaVM *vm = currentThread->javaVM;
J9InternalVMFunctions *vmFuncs = vm->internalVMFunctions;
vmFuncs->internalEnterVMFromJNI(currentThread);
f_monitorEnter(vm->liveVirtualThreadListMutex);
j9object_t threadObj = J9_JNI_UNWRAP_REFERENCE(thread);
if (firstMount) {
if (NULL == vm->liveVirtualThreadList) {
J9Class *virtualThreadClass = J9OBJECT_CLAZZ(currentThread, J9_JNI_UNWRAP_REFERENCE(thread));
J9MemoryManagerFunctions *mmFuncs = vm->memoryManagerFunctions;
/* Allocate empty virtual thread and create a global reference to it as root for the linked list.
* This prevents the root reference from becoming stale if the GC moves the object.
*/
j9object_t rootVirtualThread = mmFuncs->J9AllocateObject(currentThread, virtualThreadClass, J9_GC_ALLOCATE_OBJECT_NON_INSTRUMENTABLE);
if (NULL != rootVirtualThread) {
/* The global ref will be freed at vm death. */
jobject globalRef = vmFuncs->j9jni_createGlobalRef((JNIEnv *)currentThread, rootVirtualThread, JNI_FALSE);
if (NULL != globalRef) {
vm->liveVirtualThreadList = (j9object_t *)globalRef;
/* Set linkNext/linkPrevious to itself. */
J9OBJECT_OBJECT_STORE(currentThread, rootVirtualThread, vm->virtualThreadLinkNextOffset, rootVirtualThread);
J9OBJECT_OBJECT_STORE(currentThread, rootVirtualThread, vm->virtualThreadLinkPreviousOffset, rootVirtualThread);
} else {
vmFuncs->setNativeOutOfMemoryError(currentThread, 0, 0);
}
} else {
vmFuncs->setHeapOutOfMemoryError(currentThread);
}
}
if (NULL != vm->liveVirtualThreadList) {
j9object_t root = *(vm->liveVirtualThreadList);
j9object_t rootPrev = J9OBJECT_OBJECT_LOAD(currentThread, root, vm->virtualThreadLinkPreviousOffset);
/* Add thread to the end of the list. */
J9OBJECT_OBJECT_STORE(currentThread, threadObj, vm->virtualThreadLinkNextOffset, root);
J9OBJECT_OBJECT_STORE(currentThread, threadObj, vm->virtualThreadLinkPreviousOffset, rootPrev);
J9OBJECT_OBJECT_STORE(currentThread, rootPrev, vm->virtualThreadLinkNextOffset, threadObj);
J9OBJECT_OBJECT_STORE(currentThread, root, vm->virtualThreadLinkPreviousOffset, threadObj);
}
TRIGGER_J9HOOK_VM_VIRTUAL_THREAD_STARTED(vm->hookInterface, currentThread);
}
/* Allow thread to be inspected again. */
assert(-1 == J9OBJECT_I64_LOAD(currentThread, threadObj, vm->virtualThreadInspectorCountOffset));
J9OBJECT_I64_STORE(currentThread, threadObj, vm->virtualThreadInspectorCountOffset, 0);
/* If isSuspendedByJVMTI is non-zero, J9_PUBLIC_FLAGS_HALT_THREAD_JAVA_SUSPEND is set
* in currentThread->publicFlags while resetting isSuspendedByJVMTI to zero. During
* mount, this suspends the thread if the thread was unmounted when JVMTI suspended it.
*/
if (0 != J9OBJECT_U32_LOAD(currentThread, threadObj, vm->isSuspendedByJVMTIOffset)) {
J9OBJECT_U32_STORE(currentThread, threadObj, vm->isSuspendedByJVMTIOffset, 0);
vmFuncs->setHaltFlag(currentThread, J9_PUBLIC_FLAGS_HALT_THREAD_JAVA_SUSPEND);
}
f_monitorNotifyAll(vm->liveVirtualThreadListMutex);
f_monitorExit(vm->liveVirtualThreadListMutex);
vmFuncs->internalExitVMToJNI(currentThread);
}
JNIEXPORT void JNICALL
JVM_VirtualThreadUnmountBegin(JNIEnv *env, jobject thread, jboolean lastUnmount)
{
J9VMThread *currentThread = (J9VMThread *)env;
J9JavaVM *vm = currentThread->javaVM;
J9InternalVMFunctions *vmFuncs = vm->internalVMFunctions;
vmFuncs->internalEnterVMFromJNI(currentThread);
f_monitorEnter(vm->liveVirtualThreadListMutex);
j9object_t threadObj = J9_JNI_UNWRAP_REFERENCE(thread);
while (vm->inspectingLiveVirtualThreadList
|| (0 != J9OBJECT_I64_LOAD(currentThread, threadObj, vm->virtualThreadInspectorCountOffset))
) {
/* Thread is being inspected, wait. */
vmFuncs->internalExitVMToJNI(currentThread);
f_monitorWait(vm->liveVirtualThreadListMutex);
/* Release the monitor before suspending. */
f_monitorExit(vm->liveVirtualThreadListMutex);
/* After wait, the thread may suspend here. */
vmFuncs->internalEnterVMFromJNI(currentThread);
/* Acquire the monitor after resuming from suspend. */
f_monitorEnter(vm->liveVirtualThreadListMutex);
threadObj = J9_JNI_UNWRAP_REFERENCE(thread);
}
/* Prevent inspectors from inspecting this thread during stack swap and unmount by locking from notifyJvmtiUnmountBegin
* to notifyJvmtiUnmountEnd. See getVMThread() in jvmtiHelpers.c.
*/
J9OBJECT_I64_STORE(currentThread, threadObj, vm->virtualThreadInspectorCountOffset, -1);
if (lastUnmount) {
if (NULL != vm->liveVirtualThreadList) {
j9object_t threadPrev = J9OBJECT_OBJECT_LOAD(currentThread, threadObj, vm->virtualThreadLinkPreviousOffset);
j9object_t threadNext = J9OBJECT_OBJECT_LOAD(currentThread, threadObj, vm->virtualThreadLinkNextOffset);
/* Remove thread from list. The root will never be removed. */
J9OBJECT_OBJECT_STORE(currentThread, threadPrev, vm->virtualThreadLinkNextOffset, threadNext);
J9OBJECT_OBJECT_STORE(currentThread, threadNext, vm->virtualThreadLinkPreviousOffset, threadPrev);
}
TRIGGER_J9HOOK_VM_VIRTUAL_THREAD_END(vm->hookInterface, currentThread);
}
f_monitorExit(vm->liveVirtualThreadListMutex);
vmFuncs->internalExitVMToJNI(currentThread);
}
JNIEXPORT void JNICALL
JVM_VirtualThreadUnmountEnd(JNIEnv *env, jobject thread, jboolean lastUnmount)
{
J9VMThread *currentThread = (J9VMThread *)env;
J9JavaVM *vm = currentThread->javaVM;
J9InternalVMFunctions *vmFuncs = vm->internalVMFunctions;
vmFuncs->internalEnterVMFromJNI(currentThread);
f_monitorEnter(vm->liveVirtualThreadListMutex);
j9object_t threadObj = J9_JNI_UNWRAP_REFERENCE(thread);
if (lastUnmount) {
vmFuncs->freeTLS(currentThread, threadObj);
/* CleanupContinuation */
j9object_t contObj = (j9object_t)J9VMJAVALANGVIRTUALTHREAD_CONT(currentThread, threadObj);
vmFuncs->freeContinuation(currentThread, contObj);
}
/* Allow thread to be inspected again. */
assert(-1 == J9OBJECT_I64_LOAD(currentThread, threadObj, vm->virtualThreadInspectorCountOffset));
J9OBJECT_I64_STORE(currentThread, threadObj, vm->virtualThreadInspectorCountOffset, 0);
f_monitorNotifyAll(vm->liveVirtualThreadListMutex);
f_monitorExit(vm->liveVirtualThreadListMutex);
vmFuncs->internalExitVMToJNI(currentThread);
}
#endif /* JAVA_SPEC_VERSION >= 19 */
#if JAVA_SPEC_VERSION >= 20
JNIEXPORT jint JNICALL
JVM_GetClassFileVersion(JNIEnv *env, jclass cls)
{
jint version = 0;
J9VMThread *currentThread = (J9VMThread *)env;
J9InternalVMFunctions const * const vmFuncs = currentThread->javaVM->internalVMFunctions;
vmFuncs->internalEnterVMFromJNI(currentThread);
if (NULL == cls) {
vmFuncs->setCurrentException(currentThread, J9VMCONSTANTPOOL_JAVALANGNULLPOINTEREXCEPTION, NULL);
} else {
J9Class *clazz = J9VM_J9CLASS_FROM_JCLASS(currentThread, cls);
J9ROMClass *romClass = clazz->romClass;
if (J9ROMCLASS_IS_PRIMITIVE_OR_ARRAY(romClass)) {
version = BCT_JavaMaxMajorVersionUnshifted;
} else {
version = (jint)((romClass->minorVersion << 16) + romClass->majorVersion);
}
}
vmFuncs->internalExitVMToJNI(currentThread);
return version;
}
JNIEXPORT void JNICALL
JVM_VirtualThreadHideFrames(JNIEnv *env, jobject vthread, jboolean hide)
{
/* TODO toggle hiding of stack frames for JVMTI */
}
#endif /* JAVA_SPEC_VERSION >= 20 */
#if defined(J9VM_OPT_VALHALLA_VALUE_TYPES)
JNIEXPORT jboolean JNICALL
JVM_IsValhallaEnabled()
{
return JNI_TRUE;
}
#endif /* defined(J9VM_OPT_VALHALLA_VALUE_TYPES) */
} /* extern "C" */