1 /*
2 * Copyright (c) 1997, 2020, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "jvm.h"
27 #include "classfile/classFileStream.hpp"
28 #include "classfile/classLoader.hpp"
29 #include "classfile/classLoaderData.hpp"
30 #include "classfile/classLoaderData.inline.hpp"
31 #include "classfile/javaAssertions.hpp"
32 #include "classfile/javaClasses.inline.hpp"
33 #include "classfile/moduleEntry.hpp"
34 #include "classfile/modules.hpp"
35 #include "classfile/packageEntry.hpp"
36 #include "classfile/stringTable.hpp"
37 #include "classfile/symbolTable.hpp"
38 #include "classfile/systemDictionary.hpp"
39 #include "classfile/vmSymbols.hpp"
40 #include "gc/shared/collectedHeap.inline.hpp"
41 #include "interpreter/bytecode.hpp"
42 #include "interpreter/bytecodeUtils.hpp"
43 #include "jfr/jfrEvents.hpp"
44 #include "logging/log.hpp"
45 #include "memory/dynamicArchive.hpp"
46 #include "memory/heapShared.hpp"
47 #include "memory/oopFactory.hpp"
48 #include "memory/referenceType.hpp"
49 #include "memory/resourceArea.hpp"
50 #include "memory/universe.hpp"
51 #include "oops/access.inline.hpp"
52 #include "oops/constantPool.hpp"
53 #include "oops/fieldStreams.inline.hpp"
54 #include "oops/instanceKlass.hpp"
55 #include "oops/method.hpp"
56 #include "oops/recordComponent.hpp"
57 #include "oops/objArrayKlass.hpp"
58 #include "oops/objArrayOop.inline.hpp"
59 #include "oops/oop.inline.hpp"
60 #include "prims/jvm_misc.hpp"
61 #include "prims/jvmtiExport.hpp"
62 #include "prims/jvmtiThreadState.hpp"
63 #include "prims/nativeLookup.hpp"
64 #include "prims/stackwalk.hpp"
65 #include "runtime/arguments.hpp"
66 #include "runtime/atomic.hpp"
67 #include "runtime/handles.inline.hpp"
68 #include "runtime/init.hpp"
69 #include "runtime/interfaceSupport.inline.hpp"
70 #include "runtime/deoptimization.hpp"
71 #include "runtime/handshake.hpp"
72 #include "runtime/java.hpp"
73 #include "runtime/javaCalls.hpp"
74 #include "runtime/jfieldIDWorkaround.hpp"
75 #include "runtime/jniHandles.inline.hpp"
76 #include "runtime/os.inline.hpp"
77 #include "runtime/perfData.hpp"
78 #include "runtime/reflection.hpp"
79 #include "runtime/synchronizer.hpp"
80 #include "runtime/thread.inline.hpp"
81 #include "runtime/threadSMR.hpp"
82 #include "runtime/vframe.inline.hpp"
83 #include "runtime/vmOperations.hpp"
84 #include "runtime/vm_version.hpp"
85 #include "services/attachListener.hpp"
86 #include "services/management.hpp"
87 #include "services/threadService.hpp"
88 #include "utilities/copy.hpp"
89 #include "utilities/defaultStream.hpp"
90 #include "utilities/dtrace.hpp"
91 #include "utilities/events.hpp"
92 #include "utilities/histogram.hpp"
93 #include "utilities/macros.hpp"
94 #include "utilities/utf8.hpp"
95 #if INCLUDE_CDS
96 #include "classfile/systemDictionaryShared.hpp"
97 #endif
98
99 #include <errno.h>
100 #include <jfr/recorder/jfrRecorder.hpp>
101
102 /*
103 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
104 such ctors and calls MUST NOT come between an oop declaration/init and its
105 usage because if objects are move this may cause various memory stomps, bus
106 errors and segfaults. Here is a cookbook for causing so called "naked oop
107 failures":
108
109 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
110 JVMWrapper("JVM_GetClassDeclaredFields");
111
112 // Object address to be held directly in mirror & not visible to GC
113 oop mirror = JNIHandles::resolve_non_null(ofClass);
114
115 // If this ctor can hit a safepoint, moving objects around, then
116 ComplexConstructor foo;
117
118 // Boom! mirror may point to JUNK instead of the intended object
119 (some dereference of mirror)
120
121 // Here's another call that may block for GC, making mirror stale
122 MutexLocker ml(some_lock);
123
124 // And here's an initializer that can result in a stale oop
125 // all in one step.
126 oop o = call_that_can_throw_exception(TRAPS);
127
128
129 The solution is to keep the oop declaration BELOW the ctor or function
130 call that might cause a GC, do another resolve to reassign the oop, or
131 consider use of a Handle instead of an oop so there is immunity from object
132 motion. But note that the "QUICK" entries below do not have a handlemark
133 and thus can only support use of handles passed in.
134 */
135
136 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
137 ResourceMark rm;
138 int line_number = -1;
139 const char * source_file = NULL;
140 const char * trace = "explicit";
141 InstanceKlass* caller = NULL;
142 JavaThread* jthread = JavaThread::current();
143 if (jthread->has_last_Java_frame()) {
144 vframeStream vfst(jthread);
145
146 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
147 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController");
148 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
149 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction");
150 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
151
152 Method* last_caller = NULL;
153
154 while (!vfst.at_end()) {
155 Method* m = vfst.method();
156 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&&
157 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
158 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
159 break;
160 }
161 last_caller = m;
162 vfst.next();
163 }
164 // if this is called from Class.forName0 and that is called from Class.forName,
165 // then print the caller of Class.forName. If this is Class.loadClass, then print
166 // that caller, otherwise keep quiet since this should be picked up elsewhere.
167 bool found_it = false;
168 if (!vfst.at_end() &&
169 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
170 vfst.method()->name() == vmSymbols::forName0_name()) {
171 vfst.next();
172 if (!vfst.at_end() &&
173 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
174 vfst.method()->name() == vmSymbols::forName_name()) {
175 vfst.next();
176 found_it = true;
177 }
178 } else if (last_caller != NULL &&
179 last_caller->method_holder()->name() ==
180 vmSymbols::java_lang_ClassLoader() &&
181 last_caller->name() == vmSymbols::loadClass_name()) {
182 found_it = true;
183 } else if (!vfst.at_end()) {
184 if (vfst.method()->is_native()) {
185 // JNI call
186 found_it = true;
187 }
188 }
189 if (found_it && !vfst.at_end()) {
190 // found the caller
191 caller = vfst.method()->method_holder();
192 line_number = vfst.method()->line_number_from_bci(vfst.bci());
193 if (line_number == -1) {
194 // show method name if it's a native method
195 trace = vfst.method()->name_and_sig_as_C_string();
196 }
197 Symbol* s = caller->source_file_name();
198 if (s != NULL) {
199 source_file = s->as_C_string();
200 }
201 }
202 }
203 if (caller != NULL) {
204 if (to_class != caller) {
205 const char * from = caller->external_name();
206 const char * to = to_class->external_name();
207 // print in a single call to reduce interleaving between threads
208 if (source_file != NULL) {
209 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
210 } else {
211 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
212 }
213 }
214 }
215 }
216
217 void trace_class_resolution(Klass* to_class) {
218 EXCEPTION_MARK;
219 trace_class_resolution_impl(to_class, THREAD);
220 if (HAS_PENDING_EXCEPTION) {
221 CLEAR_PENDING_EXCEPTION;
222 }
223 }
224
225 // Wrapper to trace JVM functions
226
227 #ifdef ASSERT
228 Histogram* JVMHistogram;
229 volatile int JVMHistogram_lock = 0;
230
231 class JVMHistogramElement : public HistogramElement {
232 public:
233 JVMHistogramElement(const char* name);
234 };
235
236 JVMHistogramElement::JVMHistogramElement(const char* elementName) {
237 _name = elementName;
238 uintx count = 0;
239
240 while (Atomic::cmpxchg(&JVMHistogram_lock, 0, 1) != 0) {
241 while (Atomic::load_acquire(&JVMHistogram_lock) != 0) {
242 count +=1;
243 if ( (WarnOnStalledSpinLock > 0)
244 && (count % WarnOnStalledSpinLock == 0)) {
245 warning("JVMHistogram_lock seems to be stalled");
246 }
247 }
248 }
249
250 if(JVMHistogram == NULL)
251 JVMHistogram = new Histogram("JVM Call Counts",100);
252
253 JVMHistogram->add_element(this);
254 Atomic::dec(&JVMHistogram_lock);
255 }
256
257 #define JVMCountWrapper(arg) \
258 static JVMHistogramElement* e = new JVMHistogramElement(arg); \
259 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen!
260
261 #define JVMWrapper(arg) JVMCountWrapper(arg);
262 #else
263 #define JVMWrapper(arg)
264 #endif
265
266
267 // Interface version /////////////////////////////////////////////////////////////////////
268
269
270 JVM_LEAF(jint, JVM_GetInterfaceVersion())
271 return JVM_INTERFACE_VERSION;
272 JVM_END
273
274
275 // java.lang.System //////////////////////////////////////////////////////////////////////
276
277
278 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
279 JVMWrapper("JVM_CurrentTimeMillis");
280 return os::javaTimeMillis();
281 JVM_END
282
283 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
284 JVMWrapper("JVM_NanoTime");
285 return os::javaTimeNanos();
286 JVM_END
287
288 // The function below is actually exposed by jdk.internal.misc.VM and not
289 // java.lang.System, but we choose to keep it here so that it stays next
290 // to JVM_CurrentTimeMillis and JVM_NanoTime
291
292 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
293 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
294
295 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
296 JVMWrapper("JVM_GetNanoTimeAdjustment");
297 jlong seconds;
298 jlong nanos;
299
300 os::javaTimeSystemUTC(seconds, nanos);
301
302 // We're going to verify that the result can fit in a long.
303 // For that we need the difference in seconds between 'seconds'
304 // and 'offset_secs' to be such that:
305 // |seconds - offset_secs| < (2^63/10^9)
306 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
307 // which makes |seconds - offset_secs| < 2^33
308 // and we will prefer +/- 2^32 as the maximum acceptable diff
309 // as 2^32 has a more natural feel than 2^33...
310 //
311 // So if |seconds - offset_secs| >= 2^32 - we return a special
312 // sentinel value (-1) which the caller should take as an
313 // exception value indicating that the offset given to us is
314 // too far from range of the current time - leading to too big
315 // a nano adjustment. The caller is expected to recover by
316 // computing a more accurate offset and calling this method
317 // again. (For the record 2^32 secs is ~136 years, so that
318 // should rarely happen)
319 //
320 jlong diff = seconds - offset_secs;
321 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
322 return -1; // sentinel value: the offset is too far off the target
323 }
324
325 // return the adjustment. If you compute a time by adding
326 // this number of nanoseconds along with the number of seconds
327 // in the offset you should get the current UTC time.
328 return (diff * (jlong)1000000000) + nanos;
329 JVM_END
330
331 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
332 jobject dst, jint dst_pos, jint length))
333 JVMWrapper("JVM_ArrayCopy");
334 // Check if we have null pointers
335 if (src == NULL || dst == NULL) {
336 THROW(vmSymbols::java_lang_NullPointerException());
337 }
338 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
339 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
340 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
341 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
342 // Do copy
343 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
344 JVM_END
345
346
347 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
348 JavaValue r(T_OBJECT);
349 // public synchronized Object put(Object key, Object value);
350 HandleMark hm(THREAD);
351 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
352 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK);
353 JavaCalls::call_virtual(&r,
354 props,
355 SystemDictionary::Properties_klass(),
356 vmSymbols::put_name(),
357 vmSymbols::object_object_object_signature(),
358 key_str,
359 value_str,
360 THREAD);
361 }
362
363
364 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
365
366 /*
367 * Return all of the system properties in a Java String array with alternating
368 * names and values from the jvm SystemProperty.
369 * Which includes some internal and all commandline -D defined properties.
370 */
371 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
372 JVMWrapper("JVM_GetProperties");
373 ResourceMark rm(THREAD);
374 HandleMark hm(THREAD);
375 int ndx = 0;
376 int fixedCount = 2;
377
378 SystemProperty* p = Arguments::system_properties();
379 int count = Arguments::PropertyList_count(p);
380
381 // Allocate result String array
382 InstanceKlass* ik = SystemDictionary::String_klass();
383 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
384 objArrayHandle result_h(THREAD, r);
385
386 while (p != NULL) {
387 const char * key = p->key();
388 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
389 const char * value = p->value();
390 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
391 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK_NULL);
392 result_h->obj_at_put(ndx * 2, key_str());
393 result_h->obj_at_put(ndx * 2 + 1, value_str());
394 ndx++;
395 }
396 p = p->next();
397 }
398
399 // Convert the -XX:MaxDirectMemorySize= command line flag
400 // to the sun.nio.MaxDirectMemorySize property.
401 // Do this after setting user properties to prevent people
402 // from setting the value with a -D option, as requested.
403 // Leave empty if not supplied
404 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
405 char as_chars[256];
406 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
407 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
408 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
409 result_h->obj_at_put(ndx * 2, key_str());
410 result_h->obj_at_put(ndx * 2 + 1, value_str());
411 ndx++;
412 }
413
414 // JVM monitoring and management support
415 // Add the sun.management.compiler property for the compiler's name
416 {
417 #undef CSIZE
418 #if defined(_LP64) || defined(_WIN64)
419 #define CSIZE "64-Bit "
420 #else
421 #define CSIZE
422 #endif // 64bit
423
424 #ifdef TIERED
425 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
426 #else
427 #if defined(COMPILER1)
428 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
429 #elif defined(COMPILER2)
430 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
431 #elif INCLUDE_JVMCI
432 #error "INCLUDE_JVMCI should imply TIERED"
433 #else
434 const char* compiler_name = "";
435 #endif // compilers
436 #endif // TIERED
437
438 if (*compiler_name != '\0' &&
439 (Arguments::mode() != Arguments::_int)) {
440 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
441 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
442 result_h->obj_at_put(ndx * 2, key_str());
443 result_h->obj_at_put(ndx * 2 + 1, value_str());
444 ndx++;
445 }
446 }
447
448 return (jobjectArray) JNIHandles::make_local(env, result_h());
449 JVM_END
450
451
452 /*
453 * Return the temporary directory that the VM uses for the attach
454 * and perf data files.
455 *
456 * It is important that this directory is well-known and the
457 * same for all VM instances. It cannot be affected by configuration
458 * variables such as java.io.tmpdir.
459 */
460 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
461 JVMWrapper("JVM_GetTemporaryDirectory");
462 HandleMark hm(THREAD);
463 const char* temp_dir = os::get_temp_directory();
464 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
465 return (jstring) JNIHandles::make_local(env, h());
466 JVM_END
467
468
469 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
470
471 extern volatile jint vm_created;
472
473 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
474 JVMWrapper("JVM_BeforeHalt");
475 // Link all classes for dynamic CDS dumping before vm exit.
476 if (DynamicDumpSharedSpaces) {
477 MetaspaceShared::link_and_cleanup_shared_classes(THREAD);
478 }
479 EventShutdown event;
480 if (event.should_commit()) {
481 event.set_reason("Shutdown requested from Java");
482 event.commit();
483 }
484 JVM_END
485
486
487 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
488 before_exit(thread);
489 vm_exit(code);
490 JVM_END
491
492
493 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
494 JVMWrapper("JVM_GC");
495 if (!DisableExplicitGC) {
496 if (AsyncDeflateIdleMonitors) {
497 // AsyncDeflateIdleMonitors needs to know when System.gc() is
498 // called so any special deflation can be done at a safepoint.
499 ObjectSynchronizer::set_is_special_deflation_requested(true);
500 }
501 Universe::heap()->collect(GCCause::_java_lang_system_gc);
502 }
503 JVM_END
504
505
506 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
507 JVMWrapper("JVM_MaxObjectInspectionAge");
508 return Universe::heap()->millis_since_last_gc();
509 JVM_END
510
511
512 static inline jlong convert_size_t_to_jlong(size_t val) {
513 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
514 NOT_LP64 (return (jlong)val;)
515 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
516 }
517
518 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
519 JVMWrapper("JVM_TotalMemory");
520 size_t n = Universe::heap()->capacity();
521 return convert_size_t_to_jlong(n);
522 JVM_END
523
524
525 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
526 JVMWrapper("JVM_FreeMemory");
527 size_t n = Universe::heap()->unused();
528 return convert_size_t_to_jlong(n);
529 JVM_END
530
531
532 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
533 JVMWrapper("JVM_MaxMemory");
534 size_t n = Universe::heap()->max_capacity();
535 return convert_size_t_to_jlong(n);
536 JVM_END
537
538
539 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
540 JVMWrapper("JVM_ActiveProcessorCount");
541 return os::active_processor_count();
542 JVM_END
543
544
545
546 // java.lang.Throwable //////////////////////////////////////////////////////
547
548 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
549 JVMWrapper("JVM_FillInStackTrace");
550 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
551 java_lang_Throwable::fill_in_stack_trace(exception);
552 JVM_END
553
554 // java.lang.NullPointerException ///////////////////////////////////////////
555
556 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
557 if (!ShowCodeDetailsInExceptionMessages) return NULL;
558
559 oop exc = JNIHandles::resolve_non_null(throwable);
560
561 Method* method;
562 int bci;
563 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
564 return NULL;
565 }
566 if (method->is_native()) {
567 return NULL;
568 }
569
570 stringStream ss;
571 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
572 if (ok) {
573 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL);
574 return (jstring) JNIHandles::make_local(env, result);
575 } else {
576 return NULL;
577 }
578 JVM_END
579
580 // java.lang.StackTraceElement //////////////////////////////////////////////
581
582
583 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable))
584 JVMWrapper("JVM_InitStackTraceElementArray");
585 Handle exception(THREAD, JNIHandles::resolve(throwable));
586 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
587 objArrayHandle stack_trace(THREAD, st);
588 // Fill in the allocated stack trace
589 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK);
590 JVM_END
591
592
593 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
594 JVMWrapper("JVM_InitStackTraceElement");
595 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
596 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
597 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD);
598 JVM_END
599
600
601 // java.lang.StackWalker //////////////////////////////////////////////////////
602
603
604 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode,
605 jint skip_frames, jint frame_count, jint start_index,
606 jobjectArray frames))
607 JVMWrapper("JVM_CallStackWalk");
608 JavaThread* jt = (JavaThread*) THREAD;
609 if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) {
610 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL);
611 }
612
613 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
614
615 // frames array is a Class<?>[] array when only getting caller reference,
616 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
617 // be null.
618 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
619 objArrayHandle frames_array_h(THREAD, fa);
620
621 int limit = start_index + frame_count;
622 if (frames_array_h->length() < limit) {
623 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL);
624 }
625
626 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count,
627 start_index, frames_array_h, CHECK_NULL);
628 return JNIHandles::make_local(env, result);
629 JVM_END
630
631
632 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor,
633 jint frame_count, jint start_index,
634 jobjectArray frames))
635 JVMWrapper("JVM_MoreStackWalk");
636 JavaThread* jt = (JavaThread*) THREAD;
637
638 // frames array is a Class<?>[] array when only getting caller reference,
639 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
640 // be null.
641 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
642 objArrayHandle frames_array_h(THREAD, fa);
643
644 int limit = start_index+frame_count;
645 if (frames_array_h->length() < limit) {
646 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
647 }
648
649 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
650 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count,
651 start_index, frames_array_h, THREAD);
652 JVM_END
653
654 // java.lang.Object ///////////////////////////////////////////////
655
656
657 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
658 JVMWrapper("JVM_IHashCode");
659 // as implemented in the classic virtual machine; return 0 if object is NULL
660 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ;
661 JVM_END
662
663
664 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
665 JVMWrapper("JVM_MonitorWait");
666 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
667 JavaThreadInObjectWaitState jtiows(thread, ms != 0);
668 if (JvmtiExport::should_post_monitor_wait()) {
669 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms);
670
671 // The current thread already owns the monitor and it has not yet
672 // been added to the wait queue so the current thread cannot be
673 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
674 // event handler cannot accidentally consume an unpark() meant for
675 // the ParkEvent associated with this ObjectMonitor.
676 }
677 ObjectSynchronizer::wait(obj, ms, CHECK);
678 JVM_END
679
680
681 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
682 JVMWrapper("JVM_MonitorNotify");
683 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
684 ObjectSynchronizer::notify(obj, CHECK);
685 JVM_END
686
687
688 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
689 JVMWrapper("JVM_MonitorNotifyAll");
690 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
691 ObjectSynchronizer::notifyall(obj, CHECK);
692 JVM_END
693
694
695 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
696 JVMWrapper("JVM_Clone");
697 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
698 Klass* klass = obj->klass();
699 JvmtiVMObjectAllocEventCollector oam;
700
701 #ifdef ASSERT
702 // Just checking that the cloneable flag is set correct
703 if (obj->is_array()) {
704 guarantee(klass->is_cloneable(), "all arrays are cloneable");
705 } else {
706 guarantee(obj->is_instance(), "should be instanceOop");
707 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass());
708 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
709 }
710 #endif
711
712 // Check if class of obj supports the Cloneable interface.
713 // All arrays are considered to be cloneable (See JLS 20.1.5).
714 // All j.l.r.Reference classes are considered non-cloneable.
715 if (!klass->is_cloneable() ||
716 (klass->is_instance_klass() &&
717 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
718 ResourceMark rm(THREAD);
719 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
720 }
721
722 // Make shallow object copy
723 const int size = obj->size();
724 oop new_obj_oop = NULL;
725 if (obj->is_array()) {
726 const int length = ((arrayOop)obj())->length();
727 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
728 /* do_zero */ true, CHECK_NULL);
729 } else {
730 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
731 }
732
733 HeapAccess<>::clone(obj(), new_obj_oop, size);
734
735 Handle new_obj(THREAD, new_obj_oop);
736 // Caution: this involves a java upcall, so the clone should be
737 // "gc-robust" by this stage.
738 if (klass->has_finalizer()) {
739 assert(obj->is_instance(), "should be instanceOop");
740 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
741 new_obj = Handle(THREAD, new_obj_oop);
742 }
743
744 return JNIHandles::make_local(env, new_obj());
745 JVM_END
746
747 // java.io.File ///////////////////////////////////////////////////////////////
748
749 JVM_LEAF(char*, JVM_NativePath(char* path))
750 JVMWrapper("JVM_NativePath");
751 return os::native_path(path);
752 JVM_END
753
754
755 // Misc. class handling ///////////////////////////////////////////////////////////
756
757
758 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
759 JVMWrapper("JVM_GetCallerClass");
760
761 // Getting the class of the caller frame.
762 //
763 // The call stack at this point looks something like this:
764 //
765 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
766 // [1] [ @CallerSensitive API.method ]
767 // [.] [ (skipped intermediate frames) ]
768 // [n] [ caller ]
769 vframeStream vfst(thread);
770 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
771 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
772 Method* m = vfst.method();
773 assert(m != NULL, "sanity");
774 switch (n) {
775 case 0:
776 // This must only be called from Reflection.getCallerClass
777 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
778 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
779 }
780 // fall-through
781 case 1:
782 // Frame 0 and 1 must be caller sensitive.
783 if (!m->caller_sensitive()) {
784 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
785 }
786 break;
787 default:
788 if (!m->is_ignored_by_security_stack_walk()) {
789 // We have reached the desired frame; return the holder class.
790 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror());
791 }
792 break;
793 }
794 }
795 return NULL;
796 JVM_END
797
798
799 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
800 JVMWrapper("JVM_FindPrimitiveClass");
801 oop mirror = NULL;
802 BasicType t = name2type(utf);
803 if (t != T_ILLEGAL && !is_reference_type(t)) {
804 mirror = Universe::java_mirror(t);
805 }
806 if (mirror == NULL) {
807 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
808 } else {
809 return (jclass) JNIHandles::make_local(env, mirror);
810 }
811 JVM_END
812
813
814 // Returns a class loaded by the bootstrap class loader; or null
815 // if not found. ClassNotFoundException is not thrown.
816 // FindClassFromBootLoader is exported to the launcher for windows.
817 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
818 const char* name))
819 JVMWrapper("JVM_FindClassFromBootLoader");
820
821 // Java libraries should ensure that name is never null or illegal.
822 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
823 // It's impossible to create this class; the name cannot fit
824 // into the constant pool.
825 return NULL;
826 }
827 assert(UTF8::is_legal_utf8((const unsigned char*)name, (int)strlen(name), false), "illegal UTF name");
828
829 TempNewSymbol h_name = SymbolTable::new_symbol(name);
830 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
831 if (k == NULL) {
832 return NULL;
833 }
834
835 if (log_is_enabled(Debug, class, resolve)) {
836 trace_class_resolution(k);
837 }
838 return (jclass) JNIHandles::make_local(env, k->java_mirror());
839 JVM_END
840
841 // Find a class with this name in this loader, using the caller's protection domain.
842 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
843 jboolean init, jobject loader,
844 jclass caller))
845 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException");
846
847 TempNewSymbol h_name =
848 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
849 CHECK_NULL);
850
851 oop loader_oop = JNIHandles::resolve(loader);
852 oop from_class = JNIHandles::resolve(caller);
853 oop protection_domain = NULL;
854 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
855 // NPE. Put it in another way, the bootstrap class loader has all permission and
856 // thus no checkPackageAccess equivalence in the VM class loader.
857 // The caller is also passed as NULL by the java code if there is no security
858 // manager to avoid the performance cost of getting the calling class.
859 if (from_class != NULL && loader_oop != NULL) {
860 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
861 }
862
863 Handle h_loader(THREAD, loader_oop);
864 Handle h_prot(THREAD, protection_domain);
865 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
866 h_prot, false, THREAD);
867
868 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
869 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
870 }
871 return result;
872 JVM_END
873
874 // Currently only called from the old verifier.
875 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
876 jboolean init, jclass from))
877 JVMWrapper("JVM_FindClassFromClass");
878 TempNewSymbol h_name =
879 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
880 CHECK_NULL);
881 oop from_class_oop = JNIHandles::resolve(from);
882 Klass* from_class = (from_class_oop == NULL)
883 ? (Klass*)NULL
884 : java_lang_Class::as_Klass(from_class_oop);
885 oop class_loader = NULL;
886 oop protection_domain = NULL;
887 if (from_class != NULL) {
888 class_loader = from_class->class_loader();
889 protection_domain = from_class->protection_domain();
890 }
891 Handle h_loader(THREAD, class_loader);
892 Handle h_prot (THREAD, protection_domain);
893 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
894 h_prot, true, thread);
895
896 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
897 // this function is generally only used for class loading during verification.
898 ResourceMark rm;
899 oop from_mirror = JNIHandles::resolve_non_null(from);
900 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
901 const char * from_name = from_class->external_name();
902
903 oop mirror = JNIHandles::resolve_non_null(result);
904 Klass* to_class = java_lang_Class::as_Klass(mirror);
905 const char * to = to_class->external_name();
906 log_debug(class, resolve)("%s %s (verification)", from_name, to);
907 }
908
909 return result;
910 JVM_END
911
912 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) {
913 if (loader.is_null()) {
914 return;
915 }
916
917 // check whether the current caller thread holds the lock or not.
918 // If not, increment the corresponding counter
919 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) !=
920 ObjectSynchronizer::owner_self) {
921 counter->inc();
922 }
923 }
924
925 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
926 static jclass jvm_define_class_common(JNIEnv *env, const char *name,
927 jobject loader, const jbyte *buf,
928 jsize len, jobject pd, const char *source,
929 TRAPS) {
930 if (source == NULL) source = "__JVM_DefineClass__";
931
932 assert(THREAD->is_Java_thread(), "must be a JavaThread");
933 JavaThread* jt = (JavaThread*) THREAD;
934
935 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
936 ClassLoader::perf_define_appclass_selftime(),
937 ClassLoader::perf_define_appclasses(),
938 jt->get_thread_stat()->perf_recursion_counts_addr(),
939 jt->get_thread_stat()->perf_timers_addr(),
940 PerfClassTraceTime::DEFINE_CLASS);
941
942 if (UsePerfData) {
943 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
944 }
945
946 // Class resolution will get the class name from the .class stream if the name is null.
947 TempNewSymbol class_name = name == NULL ? NULL :
948 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
949 CHECK_NULL);
950
951 ResourceMark rm(THREAD);
952 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
953 Handle class_loader (THREAD, JNIHandles::resolve(loader));
954 if (UsePerfData) {
955 is_lock_held_by_thread(class_loader,
956 ClassLoader::sync_JVMDefineClassLockFreeCounter(),
957 THREAD);
958 }
959 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
960 Klass* k = SystemDictionary::resolve_from_stream(class_name,
961 class_loader,
962 protection_domain,
963 &st,
964 CHECK_NULL);
965
966 if (log_is_enabled(Debug, class, resolve) && k != NULL) {
967 trace_class_resolution(k);
968 }
969
970 return (jclass) JNIHandles::make_local(env, k->java_mirror());
971 }
972
973 enum {
974 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
975 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
976 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
977 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
978 };
979
980 /*
981 * Define a class with the specified flags that indicates if it's a nestmate,
982 * hidden, or strongly referenced from class loader.
983 */
984 static jclass jvm_lookup_define_class(JNIEnv *env, jclass lookup, const char *name,
985 const jbyte *buf, jsize len, jobject pd,
986 jboolean init, int flags, jobject classData, TRAPS) {
987 assert(THREAD->is_Java_thread(), "must be a JavaThread");
988 JavaThread* jt = (JavaThread*) THREAD;
989 ResourceMark rm(THREAD);
990
991 Klass* lookup_k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(lookup));
992 // Lookup class must be a non-null instance
993 if (lookup_k == NULL) {
994 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
995 }
996 assert(lookup_k->is_instance_klass(), "Lookup class must be an instance klass");
997
998 Handle class_loader (THREAD, lookup_k->class_loader());
999
1000 bool is_nestmate = (flags & NESTMATE) == NESTMATE;
1001 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
1002 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
1003 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
1004
1005 InstanceKlass* host_class = NULL;
1006 if (is_nestmate) {
1007 host_class = InstanceKlass::cast(lookup_k)->nest_host(CHECK_NULL);
1008 }
1009
1010 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
1011 name,
1012 is_nestmate ? "with dynamic nest-host " : "non-nestmate",
1013 is_nestmate ? host_class->external_name() : "",
1014 is_hidden ? "hidden" : "not hidden",
1015 is_strong ? "strong" : "weak",
1016 vm_annotations ? "with vm annotations" : "without vm annotation");
1017
1018 if (!is_hidden) {
1019 // classData is only applicable for hidden classes
1020 if (classData != NULL) {
1021 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
1022 }
1023 if (is_nestmate) {
1024 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
1025 }
1026 if (!is_strong) {
1027 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
1028 }
1029 if (vm_annotations) {
1030 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
1031 }
1032 if (flags != STRONG_LOADER_LINK) {
1033 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1034 err_msg("invalid flag 0x%x", flags));
1035 }
1036 }
1037
1038 // Class resolution will get the class name from the .class stream if the name is null.
1039 TempNewSymbol class_name = name == NULL ? NULL :
1040 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1041 CHECK_NULL);
1042
1043 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1044 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
1045 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
1046
1047 Klass* defined_k;
1048 InstanceKlass* ik = NULL;
1049 if (!is_hidden) {
1050 defined_k = SystemDictionary::resolve_from_stream(class_name,
1051 class_loader,
1052 protection_domain,
1053 &st,
1054 CHECK_NULL);
1055
1056 if (log_is_enabled(Debug, class, resolve) && defined_k != NULL) {
1057 trace_class_resolution(defined_k);
1058 }
1059 ik = InstanceKlass::cast(defined_k);
1060 } else { // hidden
1061 Handle classData_h(THREAD, JNIHandles::resolve(classData));
1062 ClassLoadInfo cl_info(protection_domain,
1063 NULL, // unsafe_anonymous_host
1064 NULL, // cp_patches
1065 host_class,
1066 classData_h,
1067 is_hidden,
1068 is_strong,
1069 vm_annotations);
1070 defined_k = SystemDictionary::parse_stream(class_name,
1071 class_loader,
1072 &st,
1073 cl_info,
1074 CHECK_NULL);
1075 if (defined_k == NULL) {
1076 THROW_MSG_0(vmSymbols::java_lang_Error(), "Failure to define a hidden class");
1077 }
1078
1079 ik = InstanceKlass::cast(defined_k);
1080
1081 // The hidden class loader data has been artificially been kept alive to
1082 // this point. The mirror and any instances of this class have to keep
1083 // it alive afterwards.
1084 ik->class_loader_data()->dec_keep_alive();
1085
1086 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1087 ModuleEntry* module = ik->module();
1088 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1089 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1090 module_name,
1091 ik->external_name(),
1092 host_class->external_name(),
1093 ik->is_hidden() ? "is hidden" : "is not hidden");
1094 }
1095 }
1096 assert(Reflection::is_same_class_package(lookup_k, defined_k),
1097 "lookup class and defined class are in different packages");
1098
1099 if (init) {
1100 ik->initialize(CHECK_NULL);
1101 } else {
1102 ik->link_class(CHECK_NULL);
1103 }
1104
1105 return (jclass) JNIHandles::make_local(env, defined_k->java_mirror());
1106 }
1107
1108 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1109 JVMWrapper("JVM_DefineClass");
1110
1111 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD);
1112 JVM_END
1113
1114 /*
1115 * Define a class with the specified lookup class.
1116 * lookup: Lookup class
1117 * name: the name of the class
1118 * buf: class bytes
1119 * len: length of class bytes
1120 * pd: protection domain
1121 * init: initialize the class
1122 * flags: properties of the class
1123 * classData: private static pre-initialized field
1124 */
1125 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1126 jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1127 JVMWrapper("JVM_LookupDefineClass");
1128
1129 if (lookup == NULL) {
1130 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1131 }
1132
1133 assert(buf != NULL, "buf must not be NULL");
1134
1135 return jvm_lookup_define_class(env, lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1136 JVM_END
1137
1138 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1139 JVMWrapper("JVM_DefineClassWithSource");
1140
1141 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD);
1142 JVM_END
1143
1144 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1145 JVMWrapper("JVM_FindLoadedClass");
1146 ResourceMark rm(THREAD);
1147
1148 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1149 char* str = java_lang_String::as_utf8_string(h_name());
1150
1151 // Sanity check, don't expect null
1152 if (str == NULL) return NULL;
1153
1154 // Internalize the string, converting '.' to '/' in string.
1155 char* p = (char*)str;
1156 while (*p != '\0') {
1157 if (*p == '.') {
1158 *p = '/';
1159 }
1160 p++;
1161 }
1162
1163 const int str_len = (int)(p - str);
1164 if (str_len > Symbol::max_length()) {
1165 // It's impossible to create this class; the name cannot fit
1166 // into the constant pool.
1167 return NULL;
1168 }
1169 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1170
1171 // Security Note:
1172 // The Java level wrapper will perform the necessary security check allowing
1173 // us to pass the NULL as the initiating class loader.
1174 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1175 if (UsePerfData) {
1176 is_lock_held_by_thread(h_loader,
1177 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(),
1178 THREAD);
1179 }
1180
1181 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name,
1182 h_loader,
1183 Handle(),
1184 CHECK_NULL);
1185 #if INCLUDE_CDS
1186 if (k == NULL) {
1187 // If the class is not already loaded, try to see if it's in the shared
1188 // archive for the current classloader (h_loader).
1189 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1190 }
1191 #endif
1192 return (k == NULL) ? NULL :
1193 (jclass) JNIHandles::make_local(env, k->java_mirror());
1194 JVM_END
1195
1196 // Module support //////////////////////////////////////////////////////////////////////////////
1197
1198 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1199 jstring location, jobjectArray packages))
1200 JVMWrapper("JVM_DefineModule");
1201 Modules::define_module(module, is_open, version, location, packages, CHECK);
1202 JVM_END
1203
1204 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1205 JVMWrapper("JVM_SetBootLoaderUnnamedModule");
1206 Modules::set_bootloader_unnamed_module(module, CHECK);
1207 JVM_END
1208
1209 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1210 JVMWrapper("JVM_AddModuleExports");
1211 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK);
1212 JVM_END
1213
1214 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1215 JVMWrapper("JVM_AddModuleExportsToAllUnnamed");
1216 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK);
1217 JVM_END
1218
1219 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1220 JVMWrapper("JVM_AddModuleExportsToAll");
1221 Modules::add_module_exports(from_module, package, NULL, CHECK);
1222 JVM_END
1223
1224 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1225 JVMWrapper("JVM_AddReadsModule");
1226 Modules::add_reads_module(from_module, source_module, CHECK);
1227 JVM_END
1228
1229 // Reflection support //////////////////////////////////////////////////////////////////////////////
1230
1231 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1232 assert (cls != NULL, "illegal class");
1233 JVMWrapper("JVM_InitClassName");
1234 JvmtiVMObjectAllocEventCollector oam;
1235 ResourceMark rm(THREAD);
1236 HandleMark hm(THREAD);
1237 Handle java_class(THREAD, JNIHandles::resolve(cls));
1238 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1239 return (jstring) JNIHandles::make_local(env, result);
1240 JVM_END
1241
1242
1243 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1244 JVMWrapper("JVM_GetClassInterfaces");
1245 JvmtiVMObjectAllocEventCollector oam;
1246 oop mirror = JNIHandles::resolve_non_null(cls);
1247
1248 // Special handling for primitive objects
1249 if (java_lang_Class::is_primitive(mirror)) {
1250 // Primitive objects does not have any interfaces
1251 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1252 return (jobjectArray) JNIHandles::make_local(env, r);
1253 }
1254
1255 Klass* klass = java_lang_Class::as_Klass(mirror);
1256 // Figure size of result array
1257 int size;
1258 if (klass->is_instance_klass()) {
1259 size = InstanceKlass::cast(klass)->local_interfaces()->length();
1260 } else {
1261 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1262 size = 2;
1263 }
1264
1265 // Allocate result array
1266 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL);
1267 objArrayHandle result (THREAD, r);
1268 // Fill in result
1269 if (klass->is_instance_klass()) {
1270 // Regular instance klass, fill in all local interfaces
1271 for (int index = 0; index < size; index++) {
1272 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1273 result->obj_at_put(index, k->java_mirror());
1274 }
1275 } else {
1276 // All arrays implement java.lang.Cloneable and java.io.Serializable
1277 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror());
1278 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror());
1279 }
1280 return (jobjectArray) JNIHandles::make_local(env, result());
1281 JVM_END
1282
1283
1284 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1285 JVMWrapper("JVM_IsInterface");
1286 oop mirror = JNIHandles::resolve_non_null(cls);
1287 if (java_lang_Class::is_primitive(mirror)) {
1288 return JNI_FALSE;
1289 }
1290 Klass* k = java_lang_Class::as_Klass(mirror);
1291 jboolean result = k->is_interface();
1292 assert(!result || k->is_instance_klass(),
1293 "all interfaces are instance types");
1294 // The compiler intrinsic for isInterface tests the
1295 // Klass::_access_flags bits in the same way.
1296 return result;
1297 JVM_END
1298
1299 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1300 JVMWrapper("JVM_IsHiddenClass");
1301 oop mirror = JNIHandles::resolve_non_null(cls);
1302 if (java_lang_Class::is_primitive(mirror)) {
1303 return JNI_FALSE;
1304 }
1305 Klass* k = java_lang_Class::as_Klass(mirror);
1306 return k->is_hidden();
1307 JVM_END
1308
1309 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1310 JVMWrapper("JVM_GetClassSigners");
1311 JvmtiVMObjectAllocEventCollector oam;
1312 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1313 // There are no signers for primitive types
1314 return NULL;
1315 }
1316
1317 objArrayHandle signers(THREAD, java_lang_Class::signers(JNIHandles::resolve_non_null(cls)));
1318
1319 // If there are no signers set in the class, or if the class
1320 // is an array, return NULL.
1321 if (signers == NULL) return NULL;
1322
1323 // copy of the signers array
1324 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1325 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1326 for (int index = 0; index < signers->length(); index++) {
1327 signers_copy->obj_at_put(index, signers->obj_at(index));
1328 }
1329
1330 // return the copy
1331 return (jobjectArray) JNIHandles::make_local(env, signers_copy);
1332 JVM_END
1333
1334
1335 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1336 JVMWrapper("JVM_SetClassSigners");
1337 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1338 // This call is ignored for primitive types and arrays.
1339 // Signers are only set once, ClassLoader.java, and thus shouldn't
1340 // be called with an array. Only the bootstrap loader creates arrays.
1341 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1342 if (k->is_instance_klass()) {
1343 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1344 }
1345 }
1346 JVM_END
1347
1348
1349 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1350 JVMWrapper("JVM_GetProtectionDomain");
1351 if (JNIHandles::resolve(cls) == NULL) {
1352 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1353 }
1354
1355 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1356 // Primitive types does not have a protection domain.
1357 return NULL;
1358 }
1359
1360 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls));
1361 return (jobject) JNIHandles::make_local(env, pd);
1362 JVM_END
1363
1364
1365 // Returns the inherited_access_control_context field of the running thread.
1366 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1367 JVMWrapper("JVM_GetInheritedAccessControlContext");
1368 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1369 return JNIHandles::make_local(env, result);
1370 JVM_END
1371
1372 class RegisterArrayForGC {
1373 private:
1374 JavaThread *_thread;
1375 public:
1376 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) {
1377 _thread = thread;
1378 _thread->register_array_for_gc(array);
1379 }
1380
1381 ~RegisterArrayForGC() {
1382 _thread->register_array_for_gc(NULL);
1383 }
1384 };
1385
1386
1387 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1388 JVMWrapper("JVM_GetStackAccessControlContext");
1389 if (!UsePrivilegedStack) return NULL;
1390
1391 ResourceMark rm(THREAD);
1392 GrowableArray<oop>* local_array = new GrowableArray<oop>(12);
1393 JvmtiVMObjectAllocEventCollector oam;
1394
1395 // count the protection domains on the execution stack. We collapse
1396 // duplicate consecutive protection domains into a single one, as
1397 // well as stopping when we hit a privileged frame.
1398
1399 oop previous_protection_domain = NULL;
1400 Handle privileged_context(thread, NULL);
1401 bool is_privileged = false;
1402 oop protection_domain = NULL;
1403
1404 // Iterate through Java frames
1405 vframeStream vfst(thread);
1406 for(; !vfst.at_end(); vfst.next()) {
1407 // get method of frame
1408 Method* method = vfst.method();
1409
1410 // stop at the first privileged frame
1411 if (method->method_holder() == SystemDictionary::AccessController_klass() &&
1412 method->name() == vmSymbols::executePrivileged_name())
1413 {
1414 // this frame is privileged
1415 is_privileged = true;
1416
1417 javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged
1418
1419 StackValueCollection* locals = priv->locals();
1420 StackValue* ctx_sv = locals->at(1); // AccessControlContext context
1421 StackValue* clr_sv = locals->at(2); // Class<?> caller
1422 assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1423 assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1424 privileged_context = ctx_sv->get_obj();
1425 Handle caller = clr_sv->get_obj();
1426
1427 Klass *caller_klass = java_lang_Class::as_Klass(caller());
1428 protection_domain = caller_klass->protection_domain();
1429 } else {
1430 protection_domain = method->method_holder()->protection_domain();
1431 }
1432
1433 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) {
1434 local_array->push(protection_domain);
1435 previous_protection_domain = protection_domain;
1436 }
1437
1438 if (is_privileged) break;
1439 }
1440
1441
1442 // either all the domains on the stack were system domains, or
1443 // we had a privileged system domain
1444 if (local_array->is_empty()) {
1445 if (is_privileged && privileged_context.is_null()) return NULL;
1446
1447 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1448 return JNIHandles::make_local(env, result);
1449 }
1450
1451 // the resource area must be registered in case of a gc
1452 RegisterArrayForGC ragc(thread, local_array);
1453 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(),
1454 local_array->length(), CHECK_NULL);
1455 objArrayHandle h_context(thread, context);
1456 for (int index = 0; index < local_array->length(); index++) {
1457 h_context->obj_at_put(index, local_array->at(index));
1458 }
1459
1460 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1461
1462 return JNIHandles::make_local(env, result);
1463 JVM_END
1464
1465
1466 JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1467 JVMWrapper("JVM_IsArrayClass");
1468 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1469 return (k != NULL) && k->is_array_klass() ? true : false;
1470 JVM_END
1471
1472
1473 JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1474 JVMWrapper("JVM_IsPrimitiveClass");
1475 oop mirror = JNIHandles::resolve_non_null(cls);
1476 return (jboolean) java_lang_Class::is_primitive(mirror);
1477 JVM_END
1478
1479
1480 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1481 JVMWrapper("JVM_GetClassModifiers");
1482 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1483 // Primitive type
1484 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1485 }
1486
1487 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1488 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0));
1489 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1490 return k->modifier_flags();
1491 JVM_END
1492
1493
1494 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1495
1496 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1497 JvmtiVMObjectAllocEventCollector oam;
1498 // ofClass is a reference to a java_lang_Class object. The mirror object
1499 // of an InstanceKlass
1500
1501 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1502 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1503 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1504 return (jobjectArray)JNIHandles::make_local(env, result);
1505 }
1506
1507 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1508 InnerClassesIterator iter(k);
1509
1510 if (iter.length() == 0) {
1511 // Neither an inner nor outer class
1512 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1513 return (jobjectArray)JNIHandles::make_local(env, result);
1514 }
1515
1516 // find inner class info
1517 constantPoolHandle cp(thread, k->constants());
1518 int length = iter.length();
1519
1520 // Allocate temp. result array
1521 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL);
1522 objArrayHandle result (THREAD, r);
1523 int members = 0;
1524
1525 for (; !iter.done(); iter.next()) {
1526 int ioff = iter.inner_class_info_index();
1527 int ooff = iter.outer_class_info_index();
1528
1529 if (ioff != 0 && ooff != 0) {
1530 // Check to see if the name matches the class we're looking for
1531 // before attempting to find the class.
1532 if (cp->klass_name_at_matches(k, ooff)) {
1533 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1534 if (outer_klass == k) {
1535 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1536 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1537
1538 // Throws an exception if outer klass has not declared k as
1539 // an inner klass
1540 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1541
1542 result->obj_at_put(members, inner_klass->java_mirror());
1543 members++;
1544 }
1545 }
1546 }
1547 }
1548
1549 if (members != length) {
1550 // Return array of right length
1551 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL);
1552 for(int i = 0; i < members; i++) {
1553 res->obj_at_put(i, result->obj_at(i));
1554 }
1555 return (jobjectArray)JNIHandles::make_local(env, res);
1556 }
1557
1558 return (jobjectArray)JNIHandles::make_local(env, result());
1559 JVM_END
1560
1561
1562 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1563 {
1564 // ofClass is a reference to a java_lang_Class object.
1565 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1566 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1567 return NULL;
1568 }
1569
1570 bool inner_is_member = false;
1571 Klass* outer_klass
1572 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))
1573 )->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1574 if (outer_klass == NULL) return NULL; // already a top-level class
1575 if (!inner_is_member) return NULL; // a hidden or unsafe anonymous class (inside a method)
1576 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror());
1577 }
1578 JVM_END
1579
1580 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1581 {
1582 oop mirror = JNIHandles::resolve_non_null(cls);
1583 if (java_lang_Class::is_primitive(mirror) ||
1584 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) {
1585 return NULL;
1586 }
1587 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
1588 int ooff = 0, noff = 0;
1589 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1590 if (noff != 0) {
1591 constantPoolHandle i_cp(thread, k->constants());
1592 Symbol* name = i_cp->symbol_at(noff);
1593 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1594 return (jstring) JNIHandles::make_local(env, str());
1595 }
1596 }
1597 return NULL;
1598 }
1599 JVM_END
1600
1601 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1602 assert (cls != NULL, "illegal class");
1603 JVMWrapper("JVM_GetClassSignature");
1604 JvmtiVMObjectAllocEventCollector oam;
1605 ResourceMark rm(THREAD);
1606 // Return null for arrays and primatives
1607 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1608 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1609 if (k->is_instance_klass()) {
1610 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1611 if (sym == NULL) return NULL;
1612 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1613 return (jstring) JNIHandles::make_local(env, str());
1614 }
1615 }
1616 return NULL;
1617 JVM_END
1618
1619
1620 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1621 assert (cls != NULL, "illegal class");
1622 JVMWrapper("JVM_GetClassAnnotations");
1623
1624 // Return null for arrays and primitives
1625 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1626 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1627 if (k->is_instance_klass()) {
1628 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1629 return (jbyteArray) JNIHandles::make_local(env, a);
1630 }
1631 }
1632 return NULL;
1633 JVM_END
1634
1635
1636 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) {
1637 // some of this code was adapted from from jni_FromReflectedField
1638
1639 oop reflected = JNIHandles::resolve_non_null(field);
1640 oop mirror = java_lang_reflect_Field::clazz(reflected);
1641 Klass* k = java_lang_Class::as_Klass(mirror);
1642 int slot = java_lang_reflect_Field::slot(reflected);
1643 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1644
1645 InstanceKlass* ik = InstanceKlass::cast(k);
1646 intptr_t offset = ik->field_offset(slot);
1647
1648 if (modifiers & JVM_ACC_STATIC) {
1649 // for static fields we only look in the current class
1650 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1651 assert(false, "cannot find static field");
1652 return false;
1653 }
1654 } else {
1655 // for instance fields we start with the current class and work
1656 // our way up through the superclass chain
1657 if (!ik->find_field_from_offset(offset, false, &fd)) {
1658 assert(false, "cannot find instance field");
1659 return false;
1660 }
1661 }
1662 return true;
1663 }
1664
1665 static Method* jvm_get_method_common(jobject method) {
1666 // some of this code was adapted from from jni_FromReflectedMethod
1667
1668 oop reflected = JNIHandles::resolve_non_null(method);
1669 oop mirror = NULL;
1670 int slot = 0;
1671
1672 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
1673 mirror = java_lang_reflect_Constructor::clazz(reflected);
1674 slot = java_lang_reflect_Constructor::slot(reflected);
1675 } else {
1676 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(),
1677 "wrong type");
1678 mirror = java_lang_reflect_Method::clazz(reflected);
1679 slot = java_lang_reflect_Method::slot(reflected);
1680 }
1681 Klass* k = java_lang_Class::as_Klass(mirror);
1682
1683 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1684 assert(m != NULL, "cannot find method");
1685 return m; // caller has to deal with NULL in product mode
1686 }
1687
1688 /* Type use annotations support (JDK 1.8) */
1689
1690 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1691 assert (cls != NULL, "illegal class");
1692 JVMWrapper("JVM_GetClassTypeAnnotations");
1693 ResourceMark rm(THREAD);
1694 // Return null for arrays and primitives
1695 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1696 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1697 if (k->is_instance_klass()) {
1698 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1699 if (type_annotations != NULL) {
1700 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1701 return (jbyteArray) JNIHandles::make_local(env, a);
1702 }
1703 }
1704 }
1705 return NULL;
1706 JVM_END
1707
1708 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1709 assert (method != NULL, "illegal method");
1710 JVMWrapper("JVM_GetMethodTypeAnnotations");
1711
1712 // method is a handle to a java.lang.reflect.Method object
1713 Method* m = jvm_get_method_common(method);
1714 if (m == NULL) {
1715 return NULL;
1716 }
1717
1718 AnnotationArray* type_annotations = m->type_annotations();
1719 if (type_annotations != NULL) {
1720 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1721 return (jbyteArray) JNIHandles::make_local(env, a);
1722 }
1723
1724 return NULL;
1725 JVM_END
1726
1727 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1728 assert (field != NULL, "illegal field");
1729 JVMWrapper("JVM_GetFieldTypeAnnotations");
1730
1731 fieldDescriptor fd;
1732 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1733 if (!gotFd) {
1734 return NULL;
1735 }
1736
1737 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD));
1738 JVM_END
1739
1740 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1741 if (!cp->is_within_bounds(index)) {
1742 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1743 }
1744 }
1745
1746 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1747 {
1748 JVMWrapper("JVM_GetMethodParameters");
1749 // method is a handle to a java.lang.reflect.Method object
1750 Method* method_ptr = jvm_get_method_common(method);
1751 methodHandle mh (THREAD, method_ptr);
1752 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1753 const int num_params = mh->method_parameters_length();
1754
1755 if (num_params < 0) {
1756 // A -1 return value from method_parameters_length means there is no
1757 // parameter data. Return null to indicate this to the reflection
1758 // API.
1759 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1760 return (jobjectArray)NULL;
1761 } else {
1762 // Otherwise, we return something up to reflection, even if it is
1763 // a zero-length array. Why? Because in some cases this can
1764 // trigger a MalformedParametersException.
1765
1766 // make sure all the symbols are properly formatted
1767 for (int i = 0; i < num_params; i++) {
1768 MethodParametersElement* params = mh->method_parameters_start();
1769 int index = params[i].name_cp_index;
1770 constantPoolHandle cp(THREAD, mh->constants());
1771 bounds_check(cp, index, CHECK_NULL);
1772
1773 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1774 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1775 "Wrong type at constant pool index");
1776 }
1777
1778 }
1779
1780 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL);
1781 objArrayHandle result (THREAD, result_oop);
1782
1783 for (int i = 0; i < num_params; i++) {
1784 MethodParametersElement* params = mh->method_parameters_start();
1785 // For a 0 index, give a NULL symbol
1786 Symbol* sym = 0 != params[i].name_cp_index ?
1787 mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1788 int flags = params[i].flags;
1789 oop param = Reflection::new_parameter(reflected_method, i, sym,
1790 flags, CHECK_NULL);
1791 result->obj_at_put(i, param);
1792 }
1793 return (jobjectArray)JNIHandles::make_local(env, result());
1794 }
1795 }
1796 JVM_END
1797
1798 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1799
1800 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1801 {
1802 JVMWrapper("JVM_GetClassDeclaredFields");
1803 JvmtiVMObjectAllocEventCollector oam;
1804
1805 // Exclude primitive types and array types
1806 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1807 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1808 // Return empty array
1809 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL);
1810 return (jobjectArray) JNIHandles::make_local(env, res);
1811 }
1812
1813 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1814 constantPoolHandle cp(THREAD, k->constants());
1815
1816 // Ensure class is linked
1817 k->link_class(CHECK_NULL);
1818
1819 // Allocate result
1820 int num_fields;
1821
1822 if (publicOnly) {
1823 num_fields = 0;
1824 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1825 if (fs.access_flags().is_public()) ++num_fields;
1826 }
1827 } else {
1828 num_fields = k->java_fields_count();
1829 }
1830
1831 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL);
1832 objArrayHandle result (THREAD, r);
1833
1834 int out_idx = 0;
1835 fieldDescriptor fd;
1836 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1837 if (!publicOnly || fs.access_flags().is_public()) {
1838 fd.reinitialize(k, fs.index());
1839 oop field = Reflection::new_field(&fd, CHECK_NULL);
1840 result->obj_at_put(out_idx, field);
1841 ++out_idx;
1842 }
1843 }
1844 assert(out_idx == num_fields, "just checking");
1845 return (jobjectArray) JNIHandles::make_local(env, result());
1846 }
1847 JVM_END
1848
1849 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1850 {
1851 JVMWrapper("JVM_IsRecord");
1852 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1853 if (k != NULL && k->is_instance_klass()) {
1854 InstanceKlass* ik = InstanceKlass::cast(k);
1855 return ik->is_record();
1856 } else {
1857 return false;
1858 }
1859 }
1860 JVM_END
1861
1862 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1863 {
1864 JVMWrapper("JVM_GetRecordComponents");
1865 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass));
1866 assert(c->is_instance_klass(), "must be");
1867 InstanceKlass* ik = InstanceKlass::cast(c);
1868
1869 if (ik->is_record()) {
1870 Array<RecordComponent*>* components = ik->record_components();
1871 assert(components != NULL, "components should not be NULL");
1872 {
1873 JvmtiVMObjectAllocEventCollector oam;
1874 constantPoolHandle cp(THREAD, ik->constants());
1875 int length = components->length();
1876 assert(length >= 0, "unexpected record_components length");
1877 objArrayOop record_components =
1878 oopFactory::new_objArray(SystemDictionary::RecordComponent_klass(), length, CHECK_NULL);
1879 objArrayHandle components_h (THREAD, record_components);
1880
1881 for (int x = 0; x < length; x++) {
1882 RecordComponent* component = components->at(x);
1883 assert(component != NULL, "unexpected NULL record component");
1884 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1885 components_h->obj_at_put(x, component_oop);
1886 }
1887 return (jobjectArray)JNIHandles::make_local(components_h());
1888 }
1889 }
1890
1891 // Return empty array if ofClass is not a record.
1892 objArrayOop result = oopFactory::new_objArray(SystemDictionary::RecordComponent_klass(), 0, CHECK_NULL);
1893 return (jobjectArray)JNIHandles::make_local(env, result);
1894 }
1895 JVM_END
1896
1897 static bool select_method(const methodHandle& method, bool want_constructor) {
1898 if (want_constructor) {
1899 return (method->is_initializer() && !method->is_static());
1900 } else {
1901 return (!method->is_initializer() && !method->is_overpass());
1902 }
1903 }
1904
1905 static jobjectArray get_class_declared_methods_helper(
1906 JNIEnv *env,
1907 jclass ofClass, jboolean publicOnly,
1908 bool want_constructor,
1909 Klass* klass, TRAPS) {
1910
1911 JvmtiVMObjectAllocEventCollector oam;
1912
1913 // Exclude primitive types and array types
1914 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass))
1915 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1916 // Return empty array
1917 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1918 return (jobjectArray) JNIHandles::make_local(env, res);
1919 }
1920
1921 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1922
1923 // Ensure class is linked
1924 k->link_class(CHECK_NULL);
1925
1926 Array<Method*>* methods = k->methods();
1927 int methods_length = methods->length();
1928
1929 // Save original method_idnum in case of redefinition, which can change
1930 // the idnum of obsolete methods. The new method will have the same idnum
1931 // but if we refresh the methods array, the counts will be wrong.
1932 ResourceMark rm(THREAD);
1933 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1934 int num_methods = 0;
1935
1936 for (int i = 0; i < methods_length; i++) {
1937 methodHandle method(THREAD, methods->at(i));
1938 if (select_method(method, want_constructor)) {
1939 if (!publicOnly || method->is_public()) {
1940 idnums->push(method->method_idnum());
1941 ++num_methods;
1942 }
1943 }
1944 }
1945
1946 // Allocate result
1947 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1948 objArrayHandle result (THREAD, r);
1949
1950 // Now just put the methods that we selected above, but go by their idnum
1951 // in case of redefinition. The methods can be redefined at any safepoint,
1952 // so above when allocating the oop array and below when creating reflect
1953 // objects.
1954 for (int i = 0; i < num_methods; i++) {
1955 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1956 if (method.is_null()) {
1957 // Method may have been deleted and seems this API can handle null
1958 // Otherwise should probably put a method that throws NSME
1959 result->obj_at_put(i, NULL);
1960 } else {
1961 oop m;
1962 if (want_constructor) {
1963 m = Reflection::new_constructor(method, CHECK_NULL);
1964 } else {
1965 m = Reflection::new_method(method, false, CHECK_NULL);
1966 }
1967 result->obj_at_put(i, m);
1968 }
1969 }
1970
1971 return (jobjectArray) JNIHandles::make_local(env, result());
1972 }
1973
1974 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1975 {
1976 JVMWrapper("JVM_GetClassDeclaredMethods");
1977 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1978 /*want_constructor*/ false,
1979 SystemDictionary::reflect_Method_klass(), THREAD);
1980 }
1981 JVM_END
1982
1983 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1984 {
1985 JVMWrapper("JVM_GetClassDeclaredConstructors");
1986 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1987 /*want_constructor*/ true,
1988 SystemDictionary::reflect_Constructor_klass(), THREAD);
1989 }
1990 JVM_END
1991
1992 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1993 {
1994 JVMWrapper("JVM_GetClassAccessFlags");
1995 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1996 // Primitive type
1997 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1998 }
1999
2000 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2001 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
2002 }
2003 JVM_END
2004
2005 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
2006 {
2007 JVMWrapper("JVM_AreNestMates");
2008 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
2009 assert(c->is_instance_klass(), "must be");
2010 InstanceKlass* ck = InstanceKlass::cast(c);
2011 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member));
2012 assert(m->is_instance_klass(), "must be");
2013 InstanceKlass* mk = InstanceKlass::cast(m);
2014 return ck->has_nestmate_access_to(mk, THREAD);
2015 }
2016 JVM_END
2017
2018 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
2019 {
2020 // current is not a primitive or array class
2021 JVMWrapper("JVM_GetNestHost");
2022 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
2023 assert(c->is_instance_klass(), "must be");
2024 InstanceKlass* ck = InstanceKlass::cast(c);
2025 InstanceKlass* host = ck->nest_host(THREAD);
2026 return (jclass) (host == NULL ? NULL :
2027 JNIHandles::make_local(THREAD, host->java_mirror()));
2028 }
2029 JVM_END
2030
2031 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
2032 {
2033 // current is not a primitive or array class
2034 JVMWrapper("JVM_GetNestMembers");
2035 ResourceMark rm(THREAD);
2036 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
2037 assert(c->is_instance_klass(), "must be");
2038 InstanceKlass* ck = InstanceKlass::cast(c);
2039 InstanceKlass* host = ck->nest_host(THREAD);
2040
2041 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
2042 ck->external_name(), host->external_name());
2043 {
2044 JvmtiVMObjectAllocEventCollector oam;
2045 Array<u2>* members = host->nest_members();
2046 int length = members == NULL ? 0 : members->length();
2047
2048 log_trace(class, nestmates)(" - host has %d listed nest members", length);
2049
2050 // nest host is first in the array so make it one bigger
2051 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(),
2052 length + 1, CHECK_NULL);
2053 objArrayHandle result(THREAD, r);
2054 result->obj_at_put(0, host->java_mirror());
2055 if (length != 0) {
2056 int count = 0;
2057 for (int i = 0; i < length; i++) {
2058 int cp_index = members->at(i);
2059 Klass* k = host->constants()->klass_at(cp_index, THREAD);
2060 if (HAS_PENDING_EXCEPTION) {
2061 if (PENDING_EXCEPTION->is_a(SystemDictionary::VirtualMachineError_klass())) {
2062 return NULL; // propagate VMEs
2063 }
2064 if (log_is_enabled(Trace, class, nestmates)) {
2065 stringStream ss;
2066 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
2067 ss.print(" - resolution of nest member %s failed: ", target_member_class);
2068 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2069 log_trace(class, nestmates)("%s", ss.as_string());
2070 }
2071 CLEAR_PENDING_EXCEPTION;
2072 continue;
2073 }
2074 if (k->is_instance_klass()) {
2075 InstanceKlass* ik = InstanceKlass::cast(k);
2076 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
2077 if (nest_host_k == host) {
2078 result->obj_at_put(count+1, k->java_mirror());
2079 count++;
2080 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
2081 } else {
2082 log_trace(class, nestmates)(" - skipping member %s with different host %s",
2083 ik->external_name(), nest_host_k->external_name());
2084 }
2085 } else {
2086 log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
2087 k->external_name());
2088 }
2089 }
2090 if (count < length) {
2091 // we had invalid entries so we need to compact the array
2092 log_trace(class, nestmates)(" - compacting array from length %d to %d",
2093 length + 1, count + 1);
2094
2095 objArrayOop r2 = oopFactory::new_objArray(SystemDictionary::Class_klass(),
2096 count + 1, CHECK_NULL);
2097 objArrayHandle result2(THREAD, r2);
2098 for (int i = 0; i < count + 1; i++) {
2099 result2->obj_at_put(i, result->obj_at(i));
2100 }
2101 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2102 }
2103 }
2104 else {
2105 assert(host == ck || ck->is_hidden(), "must be singleton nest or dynamic nestmate");
2106 }
2107 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2108 }
2109 }
2110 JVM_END
2111
2112 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
2113 {
2114 JVMWrapper("JVM_GetPermittedSubclasses");
2115 assert(!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(current)), "should not be");
2116 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
2117 assert(c->is_instance_klass(), "must be");
2118 InstanceKlass* ik = InstanceKlass::cast(c);
2119 {
2120 JvmtiVMObjectAllocEventCollector oam;
2121 Array<u2>* subclasses = ik->permitted_subclasses();
2122 int length = subclasses == NULL ? 0 : subclasses->length();
2123 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
2124 length, CHECK_NULL);
2125 objArrayHandle result(THREAD, r);
2126 for (int i = 0; i < length; i++) {
2127 int cp_index = subclasses->at(i);
2128 // This returns <package-name>/<class-name>.
2129 Symbol* klass_name = ik->constants()->klass_name_at(cp_index);
2130 assert(klass_name != NULL, "Unexpected null klass_name");
2131 Handle perm_subtype_h = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2132 result->obj_at_put(i, perm_subtype_h());
2133 }
2134 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2135 }
2136 }
2137 JVM_END
2138
2139 // Constant pool access //////////////////////////////////////////////////////////
2140
2141 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2142 {
2143 JVMWrapper("JVM_GetClassConstantPool");
2144 JvmtiVMObjectAllocEventCollector oam;
2145
2146 // Return null for primitives and arrays
2147 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
2148 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2149 if (k->is_instance_klass()) {
2150 InstanceKlass* k_h = InstanceKlass::cast(k);
2151 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2152 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2153 return JNIHandles::make_local(jcp());
2154 }
2155 }
2156 return NULL;
2157 }
2158 JVM_END
2159
2160
2161 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
2162 {
2163 JVMWrapper("JVM_ConstantPoolGetSize");
2164 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2165 return cp->length();
2166 }
2167 JVM_END
2168
2169
2170 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2171 {
2172 JVMWrapper("JVM_ConstantPoolGetClassAt");
2173 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2174 bounds_check(cp, index, CHECK_NULL);
2175 constantTag tag = cp->tag_at(index);
2176 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2177 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2178 }
2179 Klass* k = cp->klass_at(index, CHECK_NULL);
2180 return (jclass) JNIHandles::make_local(k->java_mirror());
2181 }
2182 JVM_END
2183
2184 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2185 {
2186 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
2187 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2188 bounds_check(cp, index, CHECK_NULL);
2189 constantTag tag = cp->tag_at(index);
2190 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2191 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2192 }
2193 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2194 if (k == NULL) return NULL;
2195 return (jclass) JNIHandles::make_local(k->java_mirror());
2196 }
2197 JVM_END
2198
2199 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2200 constantTag tag = cp->tag_at(index);
2201 if (!tag.is_method() && !tag.is_interface_method()) {
2202 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2203 }
2204 int klass_ref = cp->uncached_klass_ref_index_at(index);
2205 Klass* k_o;
2206 if (force_resolution) {
2207 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2208 } else {
2209 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2210 if (k_o == NULL) return NULL;
2211 }
2212 InstanceKlass* k = InstanceKlass::cast(k_o);
2213 Symbol* name = cp->uncached_name_ref_at(index);
2214 Symbol* sig = cp->uncached_signature_ref_at(index);
2215 methodHandle m (THREAD, k->find_method(name, sig));
2216 if (m.is_null()) {
2217 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2218 }
2219 oop method;
2220 if (!m->is_initializer() || m->is_static()) {
2221 method = Reflection::new_method(m, true, CHECK_NULL);
2222 } else {
2223 method = Reflection::new_constructor(m, CHECK_NULL);
2224 }
2225 return JNIHandles::make_local(method);
2226 }
2227
2228 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2229 {
2230 JVMWrapper("JVM_ConstantPoolGetMethodAt");
2231 JvmtiVMObjectAllocEventCollector oam;
2232 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2233 bounds_check(cp, index, CHECK_NULL);
2234 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2235 return res;
2236 }
2237 JVM_END
2238
2239 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2240 {
2241 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
2242 JvmtiVMObjectAllocEventCollector oam;
2243 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2244 bounds_check(cp, index, CHECK_NULL);
2245 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2246 return res;
2247 }
2248 JVM_END
2249
2250 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2251 constantTag tag = cp->tag_at(index);
2252 if (!tag.is_field()) {
2253 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2254 }
2255 int klass_ref = cp->uncached_klass_ref_index_at(index);
2256 Klass* k_o;
2257 if (force_resolution) {
2258 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2259 } else {
2260 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2261 if (k_o == NULL) return NULL;
2262 }
2263 InstanceKlass* k = InstanceKlass::cast(k_o);
2264 Symbol* name = cp->uncached_name_ref_at(index);
2265 Symbol* sig = cp->uncached_signature_ref_at(index);
2266 fieldDescriptor fd;
2267 Klass* target_klass = k->find_field(name, sig, &fd);
2268 if (target_klass == NULL) {
2269 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2270 }
2271 oop field = Reflection::new_field(&fd, CHECK_NULL);
2272 return JNIHandles::make_local(field);
2273 }
2274
2275 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2276 {
2277 JVMWrapper("JVM_ConstantPoolGetFieldAt");
2278 JvmtiVMObjectAllocEventCollector oam;
2279 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2280 bounds_check(cp, index, CHECK_NULL);
2281 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2282 return res;
2283 }
2284 JVM_END
2285
2286 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2287 {
2288 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
2289 JvmtiVMObjectAllocEventCollector oam;
2290 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2291 bounds_check(cp, index, CHECK_NULL);
2292 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2293 return res;
2294 }
2295 JVM_END
2296
2297 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2298 {
2299 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
2300 JvmtiVMObjectAllocEventCollector oam;
2301 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2302 bounds_check(cp, index, CHECK_NULL);
2303 constantTag tag = cp->tag_at(index);
2304 if (!tag.is_field_or_method()) {
2305 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2306 }
2307 int klass_ref = cp->uncached_klass_ref_index_at(index);
2308 Symbol* klass_name = cp->klass_name_at(klass_ref);
2309 Symbol* member_name = cp->uncached_name_ref_at(index);
2310 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2311 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
2312 objArrayHandle dest(THREAD, dest_o);
2313 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2314 dest->obj_at_put(0, str());
2315 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2316 dest->obj_at_put(1, str());
2317 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2318 dest->obj_at_put(2, str());
2319 return (jobjectArray) JNIHandles::make_local(dest());
2320 }
2321 JVM_END
2322
2323 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2324 {
2325 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt");
2326 JvmtiVMObjectAllocEventCollector oam;
2327 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2328 bounds_check(cp, index, CHECK_0);
2329 constantTag tag = cp->tag_at(index);
2330 if (!tag.is_field_or_method()) {
2331 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2332 }
2333 return (jint) cp->uncached_klass_ref_index_at(index);
2334 }
2335 JVM_END
2336
2337 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2338 {
2339 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt");
2340 JvmtiVMObjectAllocEventCollector oam;
2341 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2342 bounds_check(cp, index, CHECK_0);
2343 constantTag tag = cp->tag_at(index);
2344 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2345 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2346 }
2347 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2348 }
2349 JVM_END
2350
2351 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2352 {
2353 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt");
2354 JvmtiVMObjectAllocEventCollector oam;
2355 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2356 bounds_check(cp, index, CHECK_NULL);
2357 constantTag tag = cp->tag_at(index);
2358 if (!tag.is_name_and_type()) {
2359 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2360 }
2361 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2362 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2363 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL);
2364 objArrayHandle dest(THREAD, dest_o);
2365 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2366 dest->obj_at_put(0, str());
2367 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2368 dest->obj_at_put(1, str());
2369 return (jobjectArray) JNIHandles::make_local(dest());
2370 }
2371 JVM_END
2372
2373 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2374 {
2375 JVMWrapper("JVM_ConstantPoolGetIntAt");
2376 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2377 bounds_check(cp, index, CHECK_0);
2378 constantTag tag = cp->tag_at(index);
2379 if (!tag.is_int()) {
2380 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2381 }
2382 return cp->int_at(index);
2383 }
2384 JVM_END
2385
2386 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2387 {
2388 JVMWrapper("JVM_ConstantPoolGetLongAt");
2389 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2390 bounds_check(cp, index, CHECK_(0L));
2391 constantTag tag = cp->tag_at(index);
2392 if (!tag.is_long()) {
2393 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2394 }
2395 return cp->long_at(index);
2396 }
2397 JVM_END
2398
2399 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2400 {
2401 JVMWrapper("JVM_ConstantPoolGetFloatAt");
2402 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2403 bounds_check(cp, index, CHECK_(0.0f));
2404 constantTag tag = cp->tag_at(index);
2405 if (!tag.is_float()) {
2406 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2407 }
2408 return cp->float_at(index);
2409 }
2410 JVM_END
2411
2412 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2413 {
2414 JVMWrapper("JVM_ConstantPoolGetDoubleAt");
2415 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2416 bounds_check(cp, index, CHECK_(0.0));
2417 constantTag tag = cp->tag_at(index);
2418 if (!tag.is_double()) {
2419 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2420 }
2421 return cp->double_at(index);
2422 }
2423 JVM_END
2424
2425 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2426 {
2427 JVMWrapper("JVM_ConstantPoolGetStringAt");
2428 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2429 bounds_check(cp, index, CHECK_NULL);
2430 constantTag tag = cp->tag_at(index);
2431 if (!tag.is_string()) {
2432 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2433 }
2434 oop str = cp->string_at(index, CHECK_NULL);
2435 return (jstring) JNIHandles::make_local(str);
2436 }
2437 JVM_END
2438
2439 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2440 {
2441 JVMWrapper("JVM_ConstantPoolGetUTF8At");
2442 JvmtiVMObjectAllocEventCollector oam;
2443 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2444 bounds_check(cp, index, CHECK_NULL);
2445 constantTag tag = cp->tag_at(index);
2446 if (!tag.is_symbol()) {
2447 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2448 }
2449 Symbol* sym = cp->symbol_at(index);
2450 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2451 return (jstring) JNIHandles::make_local(str());
2452 }
2453 JVM_END
2454
2455 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2456 {
2457 JVMWrapper("JVM_ConstantPoolGetTagAt");
2458 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2459 bounds_check(cp, index, CHECK_0);
2460 constantTag tag = cp->tag_at(index);
2461 jbyte result = tag.value();
2462 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2463 // they are changed to the corresponding tags from the JVM spec, so that java code in
2464 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2465 if (tag.is_klass_or_reference()) {
2466 result = JVM_CONSTANT_Class;
2467 } else if (tag.is_string_index()) {
2468 result = JVM_CONSTANT_String;
2469 } else if (tag.is_method_type_in_error()) {
2470 result = JVM_CONSTANT_MethodType;
2471 } else if (tag.is_method_handle_in_error()) {
2472 result = JVM_CONSTANT_MethodHandle;
2473 } else if (tag.is_dynamic_constant_in_error()) {
2474 result = JVM_CONSTANT_Dynamic;
2475 }
2476 return result;
2477 }
2478 JVM_END
2479
2480 // Assertion support. //////////////////////////////////////////////////////////
2481
2482 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2483 JVMWrapper("JVM_DesiredAssertionStatus");
2484 assert(cls != NULL, "bad class");
2485
2486 oop r = JNIHandles::resolve(cls);
2487 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2488 if (java_lang_Class::is_primitive(r)) return false;
2489
2490 Klass* k = java_lang_Class::as_Klass(r);
2491 assert(k->is_instance_klass(), "must be an instance klass");
2492 if (!k->is_instance_klass()) return false;
2493
2494 ResourceMark rm(THREAD);
2495 const char* name = k->name()->as_C_string();
2496 bool system_class = k->class_loader() == NULL;
2497 return JavaAssertions::enabled(name, system_class);
2498
2499 JVM_END
2500
2501
2502 // Return a new AssertionStatusDirectives object with the fields filled in with
2503 // command-line assertion arguments (i.e., -ea, -da).
2504 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2505 JVMWrapper("JVM_AssertionStatusDirectives");
2506 JvmtiVMObjectAllocEventCollector oam;
2507 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2508 return JNIHandles::make_local(env, asd);
2509 JVM_END
2510
2511 // Verification ////////////////////////////////////////////////////////////////////////////////
2512
2513 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2514
2515 // RedefineClasses support: bug 6214132 caused verification to fail.
2516 // All functions from this section should call the jvmtiThreadSate function:
2517 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2518 // The function returns a Klass* of the _scratch_class if the verifier
2519 // was invoked in the middle of the class redefinition.
2520 // Otherwise it returns its argument value which is the _the_class Klass*.
2521 // Please, refer to the description in the jvmtiThreadSate.hpp.
2522
2523 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2524 JVMWrapper("JVM_GetClassNameUTF");
2525 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2526 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2527 return k->name()->as_utf8();
2528 JVM_END
2529
2530
2531 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2532 JVMWrapper("JVM_GetClassCPTypes");
2533 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2534 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2535 // types will have length zero if this is not an InstanceKlass
2536 // (length is determined by call to JVM_GetClassCPEntriesCount)
2537 if (k->is_instance_klass()) {
2538 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2539 for (int index = cp->length() - 1; index >= 0; index--) {
2540 constantTag tag = cp->tag_at(index);
2541 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2542 }
2543 }
2544 JVM_END
2545
2546
2547 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2548 JVMWrapper("JVM_GetClassCPEntriesCount");
2549 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2550 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2551 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2552 JVM_END
2553
2554
2555 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2556 JVMWrapper("JVM_GetClassFieldsCount");
2557 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2558 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2559 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2560 JVM_END
2561
2562
2563 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2564 JVMWrapper("JVM_GetClassMethodsCount");
2565 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2566 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2567 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2568 JVM_END
2569
2570
2571 // The following methods, used for the verifier, are never called with
2572 // array klasses, so a direct cast to InstanceKlass is safe.
2573 // Typically, these methods are called in a loop with bounds determined
2574 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2575 // zero for arrays.
2576 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2577 JVMWrapper("JVM_GetMethodIxExceptionIndexes");
2578 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2579 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2580 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2581 int length = method->checked_exceptions_length();
2582 if (length > 0) {
2583 CheckedExceptionElement* table= method->checked_exceptions_start();
2584 for (int i = 0; i < length; i++) {
2585 exceptions[i] = table[i].class_cp_index;
2586 }
2587 }
2588 JVM_END
2589
2590
2591 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2592 JVMWrapper("JVM_GetMethodIxExceptionsCount");
2593 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2594 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2595 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2596 return method->checked_exceptions_length();
2597 JVM_END
2598
2599
2600 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2601 JVMWrapper("JVM_GetMethodIxByteCode");
2602 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2603 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2604 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2605 memcpy(code, method->code_base(), method->code_size());
2606 JVM_END
2607
2608
2609 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2610 JVMWrapper("JVM_GetMethodIxByteCodeLength");
2611 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2612 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2613 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2614 return method->code_size();
2615 JVM_END
2616
2617
2618 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2619 JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
2620 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2621 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2622 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2623 ExceptionTable extable(method);
2624 entry->start_pc = extable.start_pc(entry_index);
2625 entry->end_pc = extable.end_pc(entry_index);
2626 entry->handler_pc = extable.handler_pc(entry_index);
2627 entry->catchType = extable.catch_type_index(entry_index);
2628 JVM_END
2629
2630
2631 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2632 JVMWrapper("JVM_GetMethodIxExceptionTableLength");
2633 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2634 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2635 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2636 return method->exception_table_length();
2637 JVM_END
2638
2639
2640 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2641 JVMWrapper("JVM_GetMethodIxModifiers");
2642 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2643 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2644 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2645 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2646 JVM_END
2647
2648
2649 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2650 JVMWrapper("JVM_GetFieldIxModifiers");
2651 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2652 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2653 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2654 JVM_END
2655
2656
2657 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2658 JVMWrapper("JVM_GetMethodIxLocalsCount");
2659 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2660 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2661 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2662 return method->max_locals();
2663 JVM_END
2664
2665
2666 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2667 JVMWrapper("JVM_GetMethodIxArgsSize");
2668 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2669 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2670 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2671 return method->size_of_parameters();
2672 JVM_END
2673
2674
2675 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2676 JVMWrapper("JVM_GetMethodIxMaxStack");
2677 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2678 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2679 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2680 return method->verifier_max_stack();
2681 JVM_END
2682
2683
2684 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2685 JVMWrapper("JVM_IsConstructorIx");
2686 ResourceMark rm(THREAD);
2687 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2688 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2689 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2690 return method->name() == vmSymbols::object_initializer_name();
2691 JVM_END
2692
2693
2694 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2695 JVMWrapper("JVM_IsVMGeneratedMethodIx");
2696 ResourceMark rm(THREAD);
2697 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2698 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2699 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2700 return method->is_overpass();
2701 JVM_END
2702
2703 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2704 JVMWrapper("JVM_GetMethodIxIxUTF");
2705 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2706 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2707 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2708 return method->name()->as_utf8();
2709 JVM_END
2710
2711
2712 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2713 JVMWrapper("JVM_GetMethodIxSignatureUTF");
2714 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2715 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2716 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2717 return method->signature()->as_utf8();
2718 JVM_END
2719
2720 /**
2721 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2722 * read entries in the constant pool. Since the old verifier always
2723 * works on a copy of the code, it will not see any rewriting that
2724 * may possibly occur in the middle of verification. So it is important
2725 * that nothing it calls tries to use the cpCache instead of the raw
2726 * constant pool, so we must use cp->uncached_x methods when appropriate.
2727 */
2728 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2729 JVMWrapper("JVM_GetCPFieldNameUTF");
2730 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2731 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2732 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2733 switch (cp->tag_at(cp_index).value()) {
2734 case JVM_CONSTANT_Fieldref:
2735 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2736 default:
2737 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2738 }
2739 ShouldNotReachHere();
2740 return NULL;
2741 JVM_END
2742
2743
2744 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2745 JVMWrapper("JVM_GetCPMethodNameUTF");
2746 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2747 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2748 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2749 switch (cp->tag_at(cp_index).value()) {
2750 case JVM_CONSTANT_InterfaceMethodref:
2751 case JVM_CONSTANT_Methodref:
2752 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2753 default:
2754 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2755 }
2756 ShouldNotReachHere();
2757 return NULL;
2758 JVM_END
2759
2760
2761 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2762 JVMWrapper("JVM_GetCPMethodSignatureUTF");
2763 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2764 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2765 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2766 switch (cp->tag_at(cp_index).value()) {
2767 case JVM_CONSTANT_InterfaceMethodref:
2768 case JVM_CONSTANT_Methodref:
2769 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2770 default:
2771 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2772 }
2773 ShouldNotReachHere();
2774 return NULL;
2775 JVM_END
2776
2777
2778 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2779 JVMWrapper("JVM_GetCPFieldSignatureUTF");
2780 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2781 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2782 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2783 switch (cp->tag_at(cp_index).value()) {
2784 case JVM_CONSTANT_Fieldref:
2785 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2786 default:
2787 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2788 }
2789 ShouldNotReachHere();
2790 return NULL;
2791 JVM_END
2792
2793
2794 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2795 JVMWrapper("JVM_GetCPClassNameUTF");
2796 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2797 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2798 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2799 Symbol* classname = cp->klass_name_at(cp_index);
2800 return classname->as_utf8();
2801 JVM_END
2802
2803
2804 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2805 JVMWrapper("JVM_GetCPFieldClassNameUTF");
2806 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2807 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2808 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2809 switch (cp->tag_at(cp_index).value()) {
2810 case JVM_CONSTANT_Fieldref: {
2811 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2812 Symbol* classname = cp->klass_name_at(class_index);
2813 return classname->as_utf8();
2814 }
2815 default:
2816 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2817 }
2818 ShouldNotReachHere();
2819 return NULL;
2820 JVM_END
2821
2822
2823 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2824 JVMWrapper("JVM_GetCPMethodClassNameUTF");
2825 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2826 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2827 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2828 switch (cp->tag_at(cp_index).value()) {
2829 case JVM_CONSTANT_Methodref:
2830 case JVM_CONSTANT_InterfaceMethodref: {
2831 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2832 Symbol* classname = cp->klass_name_at(class_index);
2833 return classname->as_utf8();
2834 }
2835 default:
2836 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2837 }
2838 ShouldNotReachHere();
2839 return NULL;
2840 JVM_END
2841
2842
2843 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2844 JVMWrapper("JVM_GetCPFieldModifiers");
2845 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2846 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2847 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2848 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2849 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2850 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2851 switch (cp->tag_at(cp_index).value()) {
2852 case JVM_CONSTANT_Fieldref: {
2853 Symbol* name = cp->uncached_name_ref_at(cp_index);
2854 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2855 InstanceKlass* ik = InstanceKlass::cast(k_called);
2856 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2857 if (fs.name() == name && fs.signature() == signature) {
2858 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2859 }
2860 }
2861 return -1;
2862 }
2863 default:
2864 fatal("JVM_GetCPFieldModifiers: illegal constant");
2865 }
2866 ShouldNotReachHere();
2867 return 0;
2868 JVM_END
2869
2870
2871 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2872 JVMWrapper("JVM_GetCPMethodModifiers");
2873 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2874 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2875 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2876 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2877 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2878 switch (cp->tag_at(cp_index).value()) {
2879 case JVM_CONSTANT_Methodref:
2880 case JVM_CONSTANT_InterfaceMethodref: {
2881 Symbol* name = cp->uncached_name_ref_at(cp_index);
2882 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2883 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2884 int methods_count = methods->length();
2885 for (int i = 0; i < methods_count; i++) {
2886 Method* method = methods->at(i);
2887 if (method->name() == name && method->signature() == signature) {
2888 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2889 }
2890 }
2891 return -1;
2892 }
2893 default:
2894 fatal("JVM_GetCPMethodModifiers: illegal constant");
2895 }
2896 ShouldNotReachHere();
2897 return 0;
2898 JVM_END
2899
2900
2901 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2902
2903 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2904 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2905 JVM_END
2906
2907
2908 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2909 JVMWrapper("JVM_IsSameClassPackage");
2910 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2911 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2912 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2913 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2914 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2915 JVM_END
2916
2917 // Printing support //////////////////////////////////////////////////
2918 extern "C" {
2919
2920 ATTRIBUTE_PRINTF(3, 0)
2921 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2922 // Reject count values that are negative signed values converted to
2923 // unsigned; see bug 4399518, 4417214
2924 if ((intptr_t)count <= 0) return -1;
2925
2926 int result = os::vsnprintf(str, count, fmt, args);
2927 if (result > 0 && (size_t)result >= count) {
2928 result = -1;
2929 }
2930
2931 return result;
2932 }
2933
2934 ATTRIBUTE_PRINTF(3, 4)
2935 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2936 va_list args;
2937 int len;
2938 va_start(args, fmt);
2939 len = jio_vsnprintf(str, count, fmt, args);
2940 va_end(args);
2941 return len;
2942 }
2943
2944 ATTRIBUTE_PRINTF(2, 3)
2945 int jio_fprintf(FILE* f, const char *fmt, ...) {
2946 int len;
2947 va_list args;
2948 va_start(args, fmt);
2949 len = jio_vfprintf(f, fmt, args);
2950 va_end(args);
2951 return len;
2952 }
2953
2954 ATTRIBUTE_PRINTF(2, 0)
2955 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2956 if (Arguments::vfprintf_hook() != NULL) {
2957 return Arguments::vfprintf_hook()(f, fmt, args);
2958 } else {
2959 return vfprintf(f, fmt, args);
2960 }
2961 }
2962
2963 ATTRIBUTE_PRINTF(1, 2)
2964 JNIEXPORT int jio_printf(const char *fmt, ...) {
2965 int len;
2966 va_list args;
2967 va_start(args, fmt);
2968 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2969 va_end(args);
2970 return len;
2971 }
2972
2973 // HotSpot specific jio method
2974 void jio_print(const char* s, size_t len) {
2975 // Try to make this function as atomic as possible.
2976 if (Arguments::vfprintf_hook() != NULL) {
2977 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2978 } else {
2979 // Make an unused local variable to avoid warning from gcc compiler.
2980 size_t count = ::write(defaultStream::output_fd(), s, (int)len);
2981 }
2982 }
2983
2984 } // Extern C
2985
2986 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2987
2988 // In most of the JVM thread support functions we need to access the
2989 // thread through a ThreadsListHandle to prevent it from exiting and
2990 // being reclaimed while we try to operate on it. The exceptions to this
2991 // rule are when operating on the current thread, or if the monitor of
2992 // the target java.lang.Thread is locked at the Java level - in both
2993 // cases the target cannot exit.
2994
2995 static void thread_entry(JavaThread* thread, TRAPS) {
2996 HandleMark hm(THREAD);
2997 Handle obj(THREAD, thread->threadObj());
2998 JavaValue result(T_VOID);
2999 JavaCalls::call_virtual(&result,
3000 obj,
3001 SystemDictionary::Thread_klass(),
3002 vmSymbols::run_method_name(),
3003 vmSymbols::void_method_signature(),
3004 THREAD);
3005 }
3006
3007
3008 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
3009 JVMWrapper("JVM_StartThread");
3010 JavaThread *native_thread = NULL;
3011
3012 // We cannot hold the Threads_lock when we throw an exception,
3013 // due to rank ordering issues. Example: we might need to grab the
3014 // Heap_lock while we construct the exception.
3015 bool throw_illegal_thread_state = false;
3016
3017 // We must release the Threads_lock before we can post a jvmti event
3018 // in Thread::start.
3019 {
3020 // Ensure that the C++ Thread and OSThread structures aren't freed before
3021 // we operate.
3022 MutexLocker mu(Threads_lock);
3023
3024 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
3025 // re-starting an already started thread, so we should usually find
3026 // that the JavaThread is null. However for a JNI attached thread
3027 // there is a small window between the Thread object being created
3028 // (with its JavaThread set) and the update to its threadStatus, so we
3029 // have to check for this
3030 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
3031 throw_illegal_thread_state = true;
3032 } else {
3033 // We could also check the stillborn flag to see if this thread was already stopped, but
3034 // for historical reasons we let the thread detect that itself when it starts running
3035
3036 jlong size =
3037 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
3038 // Allocate the C++ Thread structure and create the native thread. The
3039 // stack size retrieved from java is 64-bit signed, but the constructor takes
3040 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
3041 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
3042 // - Avoid passing negative values which would result in really large stacks.
3043 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
3044 size_t sz = size > 0 ? (size_t) size : 0;
3045 native_thread = new JavaThread(&thread_entry, sz);
3046
3047 // At this point it may be possible that no osthread was created for the
3048 // JavaThread due to lack of memory. Check for this situation and throw
3049 // an exception if necessary. Eventually we may want to change this so
3050 // that we only grab the lock if the thread was created successfully -
3051 // then we can also do this check and throw the exception in the
3052 // JavaThread constructor.
3053 if (native_thread->osthread() != NULL) {
3054 // Note: the current thread is not being used within "prepare".
3055 native_thread->prepare(jthread);
3056 }
3057 }
3058 }
3059
3060 if (throw_illegal_thread_state) {
3061 THROW(vmSymbols::java_lang_IllegalThreadStateException());
3062 }
3063
3064 assert(native_thread != NULL, "Starting null thread?");
3065
3066 if (native_thread->osthread() == NULL) {
3067 // No one should hold a reference to the 'native_thread'.
3068 native_thread->smr_delete();
3069 if (JvmtiExport::should_post_resource_exhausted()) {
3070 JvmtiExport::post_resource_exhausted(
3071 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
3072 os::native_thread_creation_failed_msg());
3073 }
3074 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
3075 os::native_thread_creation_failed_msg());
3076 }
3077
3078 #if INCLUDE_JFR
3079 if (JfrRecorder::is_recording() && EventThreadStart::is_enabled() &&
3080 EventThreadStart::is_stacktrace_enabled()) {
3081 JfrThreadLocal* tl = native_thread->jfr_thread_local();
3082 // skip Thread.start() and Thread.start0()
3083 tl->set_cached_stack_trace_id(JfrStackTraceRepository::record(thread, 2));
3084 }
3085 #endif
3086
3087 Thread::start(native_thread);
3088
3089 JVM_END
3090
3091
3092 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
3093 // before the quasi-asynchronous exception is delivered. This is a little obtrusive,
3094 // but is thought to be reliable and simple. In the case, where the receiver is the
3095 // same thread as the sender, no VM_Operation is needed.
3096 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
3097 JVMWrapper("JVM_StopThread");
3098
3099 // A nested ThreadsListHandle will grab the Threads_lock so create
3100 // tlh before we resolve throwable.
3101 ThreadsListHandle tlh(thread);
3102 oop java_throwable = JNIHandles::resolve(throwable);
3103 if (java_throwable == NULL) {
3104 THROW(vmSymbols::java_lang_NullPointerException());
3105 }
3106 oop java_thread = NULL;
3107 JavaThread* receiver = NULL;
3108 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3109 Events::log_exception(thread,
3110 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
3111 p2i(receiver), p2i(java_thread), p2i(throwable));
3112
3113 if (is_alive) {
3114 // jthread refers to a live JavaThread.
3115 if (thread == receiver) {
3116 // Exception is getting thrown at self so no VM_Operation needed.
3117 THROW_OOP(java_throwable);
3118 } else {
3119 // Use a VM_Operation to throw the exception.
3120 Thread::send_async_exception(java_thread, java_throwable);
3121 }
3122 } else {
3123 // Either:
3124 // - target thread has not been started before being stopped, or
3125 // - target thread already terminated
3126 // We could read the threadStatus to determine which case it is
3127 // but that is overkill as it doesn't matter. We must set the
3128 // stillborn flag for the first case, and if the thread has already
3129 // exited setting this flag has no effect.
3130 java_lang_Thread::set_stillborn(java_thread);
3131 }
3132 JVM_END
3133
3134
3135 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
3136 JVMWrapper("JVM_IsThreadAlive");
3137
3138 oop thread_oop = JNIHandles::resolve_non_null(jthread);
3139 return java_lang_Thread::is_alive(thread_oop);
3140 JVM_END
3141
3142
3143 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
3144 JVMWrapper("JVM_SuspendThread");
3145
3146 ThreadsListHandle tlh(thread);
3147 JavaThread* receiver = NULL;
3148 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3149 if (is_alive) {
3150 // jthread refers to a live JavaThread.
3151 {
3152 MutexLocker ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
3153 if (receiver->is_external_suspend()) {
3154 // Don't allow nested external suspend requests. We can't return
3155 // an error from this interface so just ignore the problem.
3156 return;
3157 }
3158 if (receiver->is_exiting()) { // thread is in the process of exiting
3159 return;
3160 }
3161 receiver->set_external_suspend();
3162 }
3163
3164 // java_suspend() will catch threads in the process of exiting
3165 // and will ignore them.
3166 receiver->java_suspend();
3167
3168 // It would be nice to have the following assertion in all the
3169 // time, but it is possible for a racing resume request to have
3170 // resumed this thread right after we suspended it. Temporarily
3171 // enable this assertion if you are chasing a different kind of
3172 // bug.
3173 //
3174 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
3175 // receiver->is_being_ext_suspended(), "thread is not suspended");
3176 }
3177 JVM_END
3178
3179
3180 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
3181 JVMWrapper("JVM_ResumeThread");
3182
3183 ThreadsListHandle tlh(thread);
3184 JavaThread* receiver = NULL;
3185 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3186 if (is_alive) {
3187 // jthread refers to a live JavaThread.
3188
3189 // This is the original comment for this Threads_lock grab:
3190 // We need to *always* get the threads lock here, since this operation cannot be allowed during
3191 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
3192 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code
3193 // looks at it.
3194 //
3195 // The above comment dates back to when we had both internal and
3196 // external suspend APIs that shared a common underlying mechanism.
3197 // External suspend is now entirely cooperative and doesn't share
3198 // anything with internal suspend. That said, there are some
3199 // assumptions in the VM that an external resume grabs the
3200 // Threads_lock. We can't drop the Threads_lock grab here until we
3201 // resolve the assumptions that exist elsewhere.
3202 //
3203 MutexLocker ml(Threads_lock);
3204 receiver->java_resume();
3205 }
3206 JVM_END
3207
3208
3209 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
3210 JVMWrapper("JVM_SetThreadPriority");
3211
3212 ThreadsListHandle tlh(thread);
3213 oop java_thread = NULL;
3214 JavaThread* receiver = NULL;
3215 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3216 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3217
3218 if (is_alive) {
3219 // jthread refers to a live JavaThread.
3220 Thread::set_priority(receiver, (ThreadPriority)prio);
3221 }
3222 // Implied else: If the JavaThread hasn't started yet, then the
3223 // priority set in the java.lang.Thread object above will be pushed
3224 // down when it does start.
3225 JVM_END
3226
3227
3228 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3229 JVMWrapper("JVM_Yield");
3230 if (os::dont_yield()) return;
3231 HOTSPOT_THREAD_YIELD();
3232 os::naked_yield();
3233 JVM_END
3234
3235 static void post_thread_sleep_event(EventThreadSleep* event, jlong millis) {
3236 assert(event != NULL, "invariant");
3237 assert(event->should_commit(), "invariant");
3238 event->set_time(millis);
3239 event->commit();
3240 }
3241
3242 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
3243 JVMWrapper("JVM_Sleep");
3244
3245 if (millis < 0) {
3246 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
3247 }
3248
3249 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
3250 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3251 }
3252
3253 // Save current thread state and restore it at the end of this block.
3254 // And set new thread state to SLEEPING.
3255 JavaThreadSleepState jtss(thread);
3256
3257 HOTSPOT_THREAD_SLEEP_BEGIN(millis);
3258 EventThreadSleep event;
3259
3260 if (millis == 0) {
3261 os::naked_yield();
3262 } else {
3263 ThreadState old_state = thread->osthread()->get_state();
3264 thread->osthread()->set_state(SLEEPING);
3265 if (!thread->sleep(millis)) { // interrupted
3266 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
3267 // us while we were sleeping. We do not overwrite those.
3268 if (!HAS_PENDING_EXCEPTION) {
3269 if (event.should_commit()) {
3270 post_thread_sleep_event(&event, millis);
3271 }
3272 HOTSPOT_THREAD_SLEEP_END(1);
3273
3274 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3275 // to properly restore the thread state. That's likely wrong.
3276 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3277 }
3278 }
3279 thread->osthread()->set_state(old_state);
3280 }
3281 if (event.should_commit()) {
3282 post_thread_sleep_event(&event, millis);
3283 }
3284 HOTSPOT_THREAD_SLEEP_END(0);
3285 JVM_END
3286
3287 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3288 JVMWrapper("JVM_CurrentThread");
3289 oop jthread = thread->threadObj();
3290 assert (thread != NULL, "no current thread!");
3291 return JNIHandles::make_local(env, jthread);
3292 JVM_END
3293
3294 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3295 JVMWrapper("JVM_Interrupt");
3296
3297 ThreadsListHandle tlh(thread);
3298 JavaThread* receiver = NULL;
3299 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3300 if (is_alive) {
3301 // jthread refers to a live JavaThread.
3302 receiver->interrupt();
3303 }
3304 JVM_END
3305
3306
3307 // Return true iff the current thread has locked the object passed in
3308
3309 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3310 JVMWrapper("JVM_HoldsLock");
3311 assert(THREAD->is_Java_thread(), "sanity check");
3312 if (obj == NULL) {
3313 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3314 }
3315 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3316 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
3317 JVM_END
3318
3319
3320 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3321 JVMWrapper("JVM_DumpAllStacks");
3322 VM_PrintThreads op;
3323 VMThread::execute(&op);
3324 if (JvmtiExport::should_post_data_dump()) {
3325 JvmtiExport::post_data_dump();
3326 }
3327 JVM_END
3328
3329 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3330 JVMWrapper("JVM_SetNativeThreadName");
3331
3332 // We don't use a ThreadsListHandle here because the current thread
3333 // must be alive.
3334 oop java_thread = JNIHandles::resolve_non_null(jthread);
3335 JavaThread* thr = java_lang_Thread::thread(java_thread);
3336 if (thread == thr && !thr->has_attached_via_jni()) {
3337 // Thread naming is only supported for the current thread and
3338 // we don't set the name of an attached thread to avoid stepping
3339 // on other programs.
3340 ResourceMark rm(thread);
3341 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3342 os::set_native_thread_name(thread_name);
3343 }
3344 JVM_END
3345
3346 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3347
3348 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3349 JVMWrapper("JVM_GetClassContext");
3350 ResourceMark rm(THREAD);
3351 JvmtiVMObjectAllocEventCollector oam;
3352 vframeStream vfst(thread);
3353
3354 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
3355 // This must only be called from SecurityManager.getClassContext
3356 Method* m = vfst.method();
3357 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
3358 m->name() == vmSymbols::getClassContext_name() &&
3359 m->signature() == vmSymbols::void_class_array_signature())) {
3360 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3361 }
3362 }
3363
3364 // Collect method holders
3365 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3366 for (; !vfst.at_end(); vfst.security_next()) {
3367 Method* m = vfst.method();
3368 // Native frames are not returned
3369 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3370 Klass* holder = m->method_holder();
3371 assert(holder->is_klass(), "just checking");
3372 klass_array->append(holder);
3373 }
3374 }
3375
3376 // Create result array of type [Ljava/lang/Class;
3377 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
3378 // Fill in mirrors corresponding to method holders
3379 for (int i = 0; i < klass_array->length(); i++) {
3380 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3381 }
3382
3383 return (jobjectArray) JNIHandles::make_local(env, result);
3384 JVM_END
3385
3386
3387 // java.lang.Package ////////////////////////////////////////////////////////////////
3388
3389
3390 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3391 JVMWrapper("JVM_GetSystemPackage");
3392 ResourceMark rm(THREAD);
3393 JvmtiVMObjectAllocEventCollector oam;
3394 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3395 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3396 return (jstring) JNIHandles::make_local(result);
3397 JVM_END
3398
3399
3400 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3401 JVMWrapper("JVM_GetSystemPackages");
3402 JvmtiVMObjectAllocEventCollector oam;
3403 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3404 return (jobjectArray) JNIHandles::make_local(result);
3405 JVM_END
3406
3407
3408 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3409
3410
3411 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3412 JVMWrapper("JVM_GetAndClearReferencePendingList");
3413
3414 MonitorLocker ml(Heap_lock);
3415 oop ref = Universe::reference_pending_list();
3416 if (ref != NULL) {
3417 Universe::set_reference_pending_list(NULL);
3418 }
3419 return JNIHandles::make_local(env, ref);
3420 JVM_END
3421
3422 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3423 JVMWrapper("JVM_HasReferencePendingList");
3424 MonitorLocker ml(Heap_lock);
3425 return Universe::has_reference_pending_list();
3426 JVM_END
3427
3428 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3429 JVMWrapper("JVM_WaitForReferencePendingList");
3430 MonitorLocker ml(Heap_lock);
3431 while (!Universe::has_reference_pending_list()) {
3432 ml.wait();
3433 }
3434 JVM_END
3435
3436
3437 // ObjectInputStream ///////////////////////////////////////////////////////////////
3438
3439 // Return the first user-defined class loader up the execution stack, or null
3440 // if only code from the bootstrap or platform class loader is on the stack.
3441
3442 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3443 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3444 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
3445 oop loader = vfst.method()->method_holder()->class_loader();
3446 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) {
3447 return JNIHandles::make_local(env, loader);
3448 }
3449 }
3450 return NULL;
3451 JVM_END
3452
3453
3454 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3455
3456
3457 // resolve array handle and check arguments
3458 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3459 if (arr == NULL) {
3460 THROW_0(vmSymbols::java_lang_NullPointerException());
3461 }
3462 oop a = JNIHandles::resolve_non_null(arr);
3463 if (!a->is_array()) {
3464 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3465 } else if (type_array_only && !a->is_typeArray()) {
3466 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3467 }
3468 return arrayOop(a);
3469 }
3470
3471
3472 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3473 JVMWrapper("JVM_GetArrayLength");
3474 arrayOop a = check_array(env, arr, false, CHECK_0);
3475 return a->length();
3476 JVM_END
3477
3478
3479 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3480 JVMWrapper("JVM_Array_Get");
3481 JvmtiVMObjectAllocEventCollector oam;
3482 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3483 jvalue value;
3484 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3485 oop box = Reflection::box(&value, type, CHECK_NULL);
3486 return JNIHandles::make_local(env, box);
3487 JVM_END
3488
3489
3490 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3491 JVMWrapper("JVM_GetPrimitiveArrayElement");
3492 jvalue value;
3493 value.i = 0; // to initialize value before getting used in CHECK
3494 arrayOop a = check_array(env, arr, true, CHECK_(value));
3495 assert(a->is_typeArray(), "just checking");
3496 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3497 BasicType wide_type = (BasicType) wCode;
3498 if (type != wide_type) {
3499 Reflection::widen(&value, type, wide_type, CHECK_(value));
3500 }
3501 return value;
3502 JVM_END
3503
3504
3505 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3506 JVMWrapper("JVM_SetArrayElement");
3507 arrayOop a = check_array(env, arr, false, CHECK);
3508 oop box = JNIHandles::resolve(val);
3509 jvalue value;
3510 value.i = 0; // to initialize value before getting used in CHECK
3511 BasicType value_type;
3512 if (a->is_objArray()) {
3513 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3514 value_type = Reflection::unbox_for_regular_object(box, &value);
3515 } else {
3516 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3517 }
3518 Reflection::array_set(&value, a, index, value_type, CHECK);
3519 JVM_END
3520
3521
3522 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3523 JVMWrapper("JVM_SetPrimitiveArrayElement");
3524 arrayOop a = check_array(env, arr, true, CHECK);
3525 assert(a->is_typeArray(), "just checking");
3526 BasicType value_type = (BasicType) vCode;
3527 Reflection::array_set(&v, a, index, value_type, CHECK);
3528 JVM_END
3529
3530
3531 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3532 JVMWrapper("JVM_NewArray");
3533 JvmtiVMObjectAllocEventCollector oam;
3534 oop element_mirror = JNIHandles::resolve(eltClass);
3535 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3536 return JNIHandles::make_local(env, result);
3537 JVM_END
3538
3539
3540 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3541 JVMWrapper("JVM_NewMultiArray");
3542 JvmtiVMObjectAllocEventCollector oam;
3543 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3544 oop element_mirror = JNIHandles::resolve(eltClass);
3545 assert(dim_array->is_typeArray(), "just checking");
3546 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3547 return JNIHandles::make_local(env, result);
3548 JVM_END
3549
3550
3551 // Library support ///////////////////////////////////////////////////////////////////////////
3552
3553 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
3554 //%note jvm_ct
3555 JVMWrapper("JVM_LoadLibrary");
3556 char ebuf[1024];
3557 void *load_result;
3558 {
3559 ThreadToNativeFromVM ttnfvm(thread);
3560 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3561 }
3562 if (load_result == NULL) {
3563 char msg[1024];
3564 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3565 // Since 'ebuf' may contain a string encoded using
3566 // platform encoding scheme, we need to pass
3567 // Exceptions::unsafe_to_utf8 to the new_exception method
3568 // as the last argument. See bug 6367357.
3569 Handle h_exception =
3570 Exceptions::new_exception(thread,
3571 vmSymbols::java_lang_UnsatisfiedLinkError(),
3572 msg, Exceptions::unsafe_to_utf8);
3573
3574 THROW_HANDLE_0(h_exception);
3575 }
3576 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3577 return load_result;
3578 JVM_END
3579
3580
3581 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3582 JVMWrapper("JVM_UnloadLibrary");
3583 os::dll_unload(handle);
3584 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3585 JVM_END
3586
3587
3588 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3589 JVMWrapper("JVM_FindLibraryEntry");
3590 void* find_result = os::dll_lookup(handle, name);
3591 log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3592 find_result != NULL ? "Found" : "Failed to find",
3593 name, p2i(handle));
3594 return find_result;
3595 JVM_END
3596
3597
3598 // JNI version ///////////////////////////////////////////////////////////////////////////////
3599
3600 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3601 JVMWrapper("JVM_IsSupportedJNIVersion");
3602 return Threads::is_supported_jni_version_including_1_1(version);
3603 JVM_END
3604
3605
3606 // String support ///////////////////////////////////////////////////////////////////////////
3607
3608 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3609 JVMWrapper("JVM_InternString");
3610 JvmtiVMObjectAllocEventCollector oam;
3611 if (str == NULL) return NULL;
3612 oop string = JNIHandles::resolve_non_null(str);
3613 oop result = StringTable::intern(string, CHECK_NULL);
3614 return (jstring) JNIHandles::make_local(env, result);
3615 JVM_END
3616
3617
3618 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3619
3620 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3621 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3622 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3623 // in the safepoint protocol, thread suspension, thread interruption, or anything of that
3624 // nature. JavaThreads will be "in native" when using this API from JDK code.
3625
3626
3627 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3628 VM_Exit::block_if_vm_exited();
3629 JVMWrapper("JVM_RawMonitorCreate");
3630 return new os::PlatformMutex();
3631 }
3632
3633
3634 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3635 VM_Exit::block_if_vm_exited();
3636 JVMWrapper("JVM_RawMonitorDestroy");
3637 delete ((os::PlatformMutex*) mon);
3638 }
3639
3640
3641 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3642 VM_Exit::block_if_vm_exited();
3643 JVMWrapper("JVM_RawMonitorEnter");
3644 ((os::PlatformMutex*) mon)->lock();
3645 return 0;
3646 }
3647
3648
3649 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3650 VM_Exit::block_if_vm_exited();
3651 JVMWrapper("JVM_RawMonitorExit");
3652 ((os::PlatformMutex*) mon)->unlock();
3653 }
3654
3655
3656 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3657
3658 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3659 Handle loader, Handle protection_domain,
3660 jboolean throwError, TRAPS) {
3661 // Security Note:
3662 // The Java level wrapper will perform the necessary security check allowing
3663 // us to pass the NULL as the initiating class loader. The VM is responsible for
3664 // the checkPackageAccess relative to the initiating class loader via the
3665 // protection_domain. The protection_domain is passed as NULL by the java code
3666 // if there is no security manager in 3-arg Class.forName().
3667 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3668
3669 // Check if we should initialize the class
3670 if (init && klass->is_instance_klass()) {
3671 klass->initialize(CHECK_NULL);
3672 }
3673 return (jclass) JNIHandles::make_local(env, klass->java_mirror());
3674 }
3675
3676
3677 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3678
3679 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3680 JVMWrapper("JVM_InvokeMethod");
3681 Handle method_handle;
3682 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3683 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3684 Handle receiver(THREAD, JNIHandles::resolve(obj));
3685 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3686 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3687 jobject res = JNIHandles::make_local(env, result);
3688 if (JvmtiExport::should_post_vm_object_alloc()) {
3689 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3690 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3691 if (java_lang_Class::is_primitive(ret_type)) {
3692 // Only for primitive type vm allocates memory for java object.
3693 // See box() method.
3694 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3695 }
3696 }
3697 return res;
3698 } else {
3699 THROW_0(vmSymbols::java_lang_StackOverflowError());
3700 }
3701 JVM_END
3702
3703
3704 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3705 JVMWrapper("JVM_NewInstanceFromConstructor");
3706 oop constructor_mirror = JNIHandles::resolve(c);
3707 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3708 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3709 jobject res = JNIHandles::make_local(env, result);
3710 if (JvmtiExport::should_post_vm_object_alloc()) {
3711 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3712 }
3713 return res;
3714 JVM_END
3715
3716 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3717
3718 JVM_LEAF(jboolean, JVM_SupportsCX8())
3719 JVMWrapper("JVM_SupportsCX8");
3720 return VM_Version::supports_cx8();
3721 JVM_END
3722
3723 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3724 JVMWrapper("JVM_InitializeFromArchive");
3725 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3726 assert(k->is_klass(), "just checking");
3727 HeapShared::initialize_from_archived_subgraph(k);
3728 JVM_END
3729
3730 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3731 jclass caller,
3732 jstring invokedName,
3733 jobject invokedType,
3734 jobject methodType,
3735 jobject implMethodMember,
3736 jobject instantiatedMethodType,
3737 jclass lambdaProxyClass))
3738 JVMWrapper("JVM_RegisterLambdaProxyClassForArchiving");
3739 #if INCLUDE_CDS
3740 if (!DynamicDumpSharedSpaces) {
3741 return;
3742 }
3743
3744 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3745 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3746 if (caller_ik->is_hidden() || caller_ik->is_unsafe_anonymous()) {
3747 // VM anonymous classes and hidden classes not of type lambda proxy classes are currently not being archived.
3748 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3749 // registered for archiving.
3750 return;
3751 }
3752 Klass* lambda_k = java_lang_Class::as_Klass(JNIHandles::resolve(lambdaProxyClass));
3753 InstanceKlass* lambda_ik = InstanceKlass::cast(lambda_k);
3754 assert(lambda_ik->is_hidden(), "must be a hidden class");
3755 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3756
3757 Symbol* invoked_name = NULL;
3758 if (invokedName != NULL) {
3759 invoked_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(invokedName));
3760 }
3761 Handle invoked_type_oop(THREAD, JNIHandles::resolve_non_null(invokedType));
3762 Symbol* invoked_type = java_lang_invoke_MethodType::as_signature(invoked_type_oop(), true);
3763
3764 Handle method_type_oop(THREAD, JNIHandles::resolve_non_null(methodType));
3765 Symbol* method_type = java_lang_invoke_MethodType::as_signature(method_type_oop(), true);
3766
3767 Handle impl_method_member_oop(THREAD, JNIHandles::resolve_non_null(implMethodMember));
3768 assert(java_lang_invoke_MemberName::is_method(impl_method_member_oop()), "must be");
3769 Method* m = java_lang_invoke_MemberName::vmtarget(impl_method_member_oop());
3770
3771 Handle instantiated_method_type_oop(THREAD, JNIHandles::resolve_non_null(instantiatedMethodType));
3772 Symbol* instantiated_method_type = java_lang_invoke_MethodType::as_signature(instantiated_method_type_oop(), true);
3773
3774 SystemDictionaryShared::add_lambda_proxy_class(caller_ik, lambda_ik, invoked_name, invoked_type,
3775 method_type, m, instantiated_method_type);
3776 #endif // INCLUDE_CDS
3777 JVM_END
3778
3779 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3780 jclass caller,
3781 jstring invokedName,
3782 jobject invokedType,
3783 jobject methodType,
3784 jobject implMethodMember,
3785 jobject instantiatedMethodType,
3786 jboolean initialize))
3787 JVMWrapper("JVM_LookupLambdaProxyClassFromArchive");
3788 #if INCLUDE_CDS
3789 if (!DynamicArchive::is_mapped()) {
3790 return NULL;
3791 }
3792
3793 if (invokedName == NULL || invokedType == NULL || methodType == NULL ||
3794 implMethodMember == NULL || instantiatedMethodType == NULL) {
3795 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
3796 }
3797
3798 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3799 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3800 if (!caller_ik->is_shared()) {
3801 // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3802 return NULL;
3803 }
3804
3805 Symbol* invoked_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(invokedName));
3806 Handle invoked_type_oop(THREAD, JNIHandles::resolve_non_null(invokedType));
3807 Symbol* invoked_type = java_lang_invoke_MethodType::as_signature(invoked_type_oop(), true);
3808
3809 Handle method_type_oop(THREAD, JNIHandles::resolve_non_null(methodType));
3810 Symbol* method_type = java_lang_invoke_MethodType::as_signature(method_type_oop(), true);
3811
3812 Handle impl_method_member_oop(THREAD, JNIHandles::resolve_non_null(implMethodMember));
3813 assert(java_lang_invoke_MemberName::is_method(impl_method_member_oop()), "must be");
3814 Method* m = java_lang_invoke_MemberName::vmtarget(impl_method_member_oop());
3815
3816 Handle instantiated_method_type_oop(THREAD, JNIHandles::resolve_non_null(instantiatedMethodType));
3817 Symbol* instantiated_method_type = java_lang_invoke_MethodType::as_signature(instantiated_method_type_oop(), true);
3818
3819 InstanceKlass* lambda_ik = SystemDictionaryShared::get_shared_lambda_proxy_class(caller_ik, invoked_name, invoked_type,
3820 method_type, m, instantiated_method_type);
3821 jclass jcls = NULL;
3822 if (lambda_ik != NULL) {
3823 InstanceKlass* loaded_lambda = SystemDictionaryShared::prepare_shared_lambda_proxy_class(lambda_ik, caller_ik, initialize, THREAD);
3824 jcls = loaded_lambda == NULL ? NULL : (jclass) JNIHandles::make_local(env, loaded_lambda->java_mirror());
3825 }
3826 return jcls;
3827 #else
3828 return NULL;
3829 #endif // INCLUDE_CDS
3830 JVM_END
3831
3832 JVM_ENTRY(jboolean, JVM_IsCDSDumpingEnabled(JNIEnv* env))
3833 JVMWrapper("JVM_IsCDSDumpingEnable");
3834 return DynamicDumpSharedSpaces;
3835 JVM_END
3836
3837 JVM_ENTRY(jboolean, JVM_IsCDSSharingEnabled(JNIEnv* env))
3838 JVMWrapper("JVM_IsCDSSharingEnable");
3839 return UseSharedSpaces;
3840 JVM_END
3841
3842 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForCDSDump())
3843 JVMWrapper("JVM_GetRandomSeedForCDSDump");
3844 if (DumpSharedSpaces) {
3845 const char* release = Abstract_VM_Version::vm_release();
3846 const char* dbg_level = Abstract_VM_Version::jdk_debug_level();
3847 const char* version = VM_Version::internal_vm_info_string();
3848 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3849 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3850 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3851 seed += (jlong)Abstract_VM_Version::vm_major_version();
3852 seed += (jlong)Abstract_VM_Version::vm_minor_version();
3853 seed += (jlong)Abstract_VM_Version::vm_security_version();
3854 seed += (jlong)Abstract_VM_Version::vm_patch_version();
3855 if (seed == 0) { // don't let this ever be zero.
3856 seed = 0x87654321;
3857 }
3858 log_debug(cds)("JVM_GetRandomSeedForCDSDump() = " JLONG_FORMAT, seed);
3859 return seed;
3860 } else {
3861 return 0;
3862 }
3863 JVM_END
3864
3865 // Returns an array of all live Thread objects (VM internal JavaThreads,
3866 // jvmti agent threads, and JNI attaching threads are skipped)
3867 // See CR 6404306 regarding JNI attaching threads
3868 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3869 ResourceMark rm(THREAD);
3870 ThreadsListEnumerator tle(THREAD, false, false);
3871 JvmtiVMObjectAllocEventCollector oam;
3872
3873 int num_threads = tle.num_threads();
3874 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
3875 objArrayHandle threads_ah(THREAD, r);
3876
3877 for (int i = 0; i < num_threads; i++) {
3878 Handle h = tle.get_threadObj(i);
3879 threads_ah->obj_at_put(i, h());
3880 }
3881
3882 return (jobjectArray) JNIHandles::make_local(env, threads_ah());
3883 JVM_END
3884
3885
3886 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3887 // Return StackTraceElement[][], each element is the stack trace of a thread in
3888 // the corresponding entry in the given threads array
3889 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3890 JVMWrapper("JVM_DumpThreads");
3891 JvmtiVMObjectAllocEventCollector oam;
3892
3893 // Check if threads is null
3894 if (threads == NULL) {
3895 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3896 }
3897
3898 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3899 objArrayHandle ah(THREAD, a);
3900 int num_threads = ah->length();
3901 // check if threads is non-empty array
3902 if (num_threads == 0) {
3903 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3904 }
3905
3906 // check if threads is not an array of objects of Thread class
3907 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3908 if (k != SystemDictionary::Thread_klass()) {
3909 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3910 }
3911
3912 ResourceMark rm(THREAD);
3913
3914 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3915 for (int i = 0; i < num_threads; i++) {
3916 oop thread_obj = ah->obj_at(i);
3917 instanceHandle h(THREAD, (instanceOop) thread_obj);
3918 thread_handle_array->append(h);
3919 }
3920
3921 // The JavaThread references in thread_handle_array are validated
3922 // in VM_ThreadDump::doit().
3923 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3924 return (jobjectArray)JNIHandles::make_local(env, stacktraces());
3925
3926 JVM_END
3927
3928 // JVM monitoring and management support
3929 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
3930 return Management::get_jmm_interface(version);
3931 JVM_END
3932
3933 // com.sun.tools.attach.VirtualMachine agent properties support
3934 //
3935 // Initialize the agent properties with the properties maintained in the VM
3936 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3937 JVMWrapper("JVM_InitAgentProperties");
3938 ResourceMark rm;
3939
3940 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3941
3942 PUTPROP(props, "sun.java.command", Arguments::java_command());
3943 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3944 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3945 return properties;
3946 JVM_END
3947
3948 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3949 {
3950 JVMWrapper("JVM_GetEnclosingMethodInfo");
3951 JvmtiVMObjectAllocEventCollector oam;
3952
3953 if (ofClass == NULL) {
3954 return NULL;
3955 }
3956 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3957 // Special handling for primitive objects
3958 if (java_lang_Class::is_primitive(mirror())) {
3959 return NULL;
3960 }
3961 Klass* k = java_lang_Class::as_Klass(mirror());
3962 if (!k->is_instance_klass()) {
3963 return NULL;
3964 }
3965 InstanceKlass* ik = InstanceKlass::cast(k);
3966 int encl_method_class_idx = ik->enclosing_method_class_index();
3967 if (encl_method_class_idx == 0) {
3968 return NULL;
3969 }
3970 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
3971 objArrayHandle dest(THREAD, dest_o);
3972 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3973 dest->obj_at_put(0, enc_k->java_mirror());
3974 int encl_method_method_idx = ik->enclosing_method_method_index();
3975 if (encl_method_method_idx != 0) {
3976 Symbol* sym = ik->constants()->symbol_at(
3977 extract_low_short_from_int(
3978 ik->constants()->name_and_type_at(encl_method_method_idx)));
3979 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3980 dest->obj_at_put(1, str());
3981 sym = ik->constants()->symbol_at(
3982 extract_high_short_from_int(
3983 ik->constants()->name_and_type_at(encl_method_method_idx)));
3984 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3985 dest->obj_at_put(2, str());
3986 }
3987 return (jobjectArray) JNIHandles::make_local(dest());
3988 }
3989 JVM_END
3990
3991 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3992 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3993 ResourceMark rm(THREAD);
3994
3995 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3996 return NULL;
3997 }
3998
3999 char** vm_flags = Arguments::jvm_flags_array();
4000 char** vm_args = Arguments::jvm_args_array();
4001 int num_flags = Arguments::num_jvm_flags();
4002 int num_args = Arguments::num_jvm_args();
4003
4004 InstanceKlass* ik = SystemDictionary::String_klass();
4005 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
4006 objArrayHandle result_h(THREAD, r);
4007
4008 int index = 0;
4009 for (int j = 0; j < num_flags; j++, index++) {
4010 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
4011 result_h->obj_at_put(index, h());
4012 }
4013 for (int i = 0; i < num_args; i++, index++) {
4014 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
4015 result_h->obj_at_put(index, h());
4016 }
4017 return (jobjectArray) JNIHandles::make_local(env, result_h());
4018 JVM_END
4019
4020 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
4021 return os::get_signal_number(name);
4022 JVM_END