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 #if INCLUDE_JFR
99 #include "jfr/jfr.hpp"
100 #endif
101
102 #include <errno.h>
103
104 /*
105 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
106 such ctors and calls MUST NOT come between an oop declaration/init and its
107 usage because if objects are move this may cause various memory stomps, bus
108 errors and segfaults. Here is a cookbook for causing so called "naked oop
109 failures":
110
111 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
112 JVMWrapper("JVM_GetClassDeclaredFields");
113
114 // Object address to be held directly in mirror & not visible to GC
115 oop mirror = JNIHandles::resolve_non_null(ofClass);
116
117 // If this ctor can hit a safepoint, moving objects around, then
118 ComplexConstructor foo;
119
120 // Boom! mirror may point to JUNK instead of the intended object
121 (some dereference of mirror)
122
123 // Here's another call that may block for GC, making mirror stale
124 MutexLocker ml(some_lock);
125
126 // And here's an initializer that can result in a stale oop
127 // all in one step.
128 oop o = call_that_can_throw_exception(TRAPS);
129
130
131 The solution is to keep the oop declaration BELOW the ctor or function
132 call that might cause a GC, do another resolve to reassign the oop, or
133 consider use of a Handle instead of an oop so there is immunity from object
134 motion. But note that the "QUICK" entries below do not have a handlemark
135 and thus can only support use of handles passed in.
136 */
137
138 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
139 ResourceMark rm;
140 int line_number = -1;
141 const char * source_file = NULL;
142 const char * trace = "explicit";
143 InstanceKlass* caller = NULL;
144 JavaThread* jthread = (JavaThread*) THREAD;
145 if (jthread->has_last_Java_frame()) {
146 vframeStream vfst(jthread);
147
148 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
149 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController");
150 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
151 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction");
152 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
153
154 Method* last_caller = NULL;
155
156 while (!vfst.at_end()) {
157 Method* m = vfst.method();
158 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&&
159 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
160 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
161 break;
162 }
163 last_caller = m;
164 vfst.next();
165 }
166 // if this is called from Class.forName0 and that is called from Class.forName,
167 // then print the caller of Class.forName. If this is Class.loadClass, then print
168 // that caller, otherwise keep quiet since this should be picked up elsewhere.
169 bool found_it = false;
170 if (!vfst.at_end() &&
171 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
172 vfst.method()->name() == vmSymbols::forName0_name()) {
173 vfst.next();
174 if (!vfst.at_end() &&
175 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
176 vfst.method()->name() == vmSymbols::forName_name()) {
177 vfst.next();
178 found_it = true;
179 }
180 } else if (last_caller != NULL &&
181 last_caller->method_holder()->name() ==
182 vmSymbols::java_lang_ClassLoader() &&
183 last_caller->name() == vmSymbols::loadClass_name()) {
184 found_it = true;
185 } else if (!vfst.at_end()) {
186 if (vfst.method()->is_native()) {
187 // JNI call
188 found_it = true;
189 }
190 }
191 if (found_it && !vfst.at_end()) {
192 // found the caller
193 caller = vfst.method()->method_holder();
194 line_number = vfst.method()->line_number_from_bci(vfst.bci());
195 if (line_number == -1) {
196 // show method name if it's a native method
197 trace = vfst.method()->name_and_sig_as_C_string();
198 }
199 Symbol* s = caller->source_file_name();
200 if (s != NULL) {
201 source_file = s->as_C_string();
202 }
203 }
204 }
205 if (caller != NULL) {
206 if (to_class != caller) {
207 const char * from = caller->external_name();
208 const char * to = to_class->external_name();
209 // print in a single call to reduce interleaving between threads
210 if (source_file != NULL) {
211 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
212 } else {
213 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
214 }
215 }
216 }
217 }
218
219 void trace_class_resolution(Klass* to_class) {
220 EXCEPTION_MARK;
221 trace_class_resolution_impl(to_class, THREAD);
222 if (HAS_PENDING_EXCEPTION) {
223 CLEAR_PENDING_EXCEPTION;
224 }
225 }
226
227 // Wrapper to trace JVM functions
228
229 #ifdef ASSERT
230 Histogram* JVMHistogram;
231 volatile int JVMHistogram_lock = 0;
232
233 class JVMHistogramElement : public HistogramElement {
234 public:
235 JVMHistogramElement(const char* name);
236 };
237
238 JVMHistogramElement::JVMHistogramElement(const char* elementName) {
239 _name = elementName;
240 uintx count = 0;
241
242 while (Atomic::cmpxchg(&JVMHistogram_lock, 0, 1) != 0) {
243 while (Atomic::load_acquire(&JVMHistogram_lock) != 0) {
244 count +=1;
245 if ( (WarnOnStalledSpinLock > 0)
246 && (count % WarnOnStalledSpinLock == 0)) {
247 warning("JVMHistogram_lock seems to be stalled");
248 }
249 }
250 }
251
252 if(JVMHistogram == NULL)
253 JVMHistogram = new Histogram("JVM Call Counts",100);
254
255 JVMHistogram->add_element(this);
256 Atomic::dec(&JVMHistogram_lock);
257 }
258
259 #define JVMCountWrapper(arg) \
260 static JVMHistogramElement* e = new JVMHistogramElement(arg); \
261 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen!
262
263 #define JVMWrapper(arg) JVMCountWrapper(arg);
264 #else
265 #define JVMWrapper(arg)
266 #endif
267
268
269 // Interface version /////////////////////////////////////////////////////////////////////
270
271
272 JVM_LEAF(jint, JVM_GetInterfaceVersion())
273 return JVM_INTERFACE_VERSION;
274 JVM_END
275
276
277 // java.lang.System //////////////////////////////////////////////////////////////////////
278
279
280 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
281 JVMWrapper("JVM_CurrentTimeMillis");
282 return os::javaTimeMillis();
283 JVM_END
284
285 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
286 JVMWrapper("JVM_NanoTime");
287 return os::javaTimeNanos();
288 JVM_END
289
290 // The function below is actually exposed by jdk.internal.misc.VM and not
291 // java.lang.System, but we choose to keep it here so that it stays next
292 // to JVM_CurrentTimeMillis and JVM_NanoTime
293
294 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
295 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
296
297 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
298 JVMWrapper("JVM_GetNanoTimeAdjustment");
299 jlong seconds;
300 jlong nanos;
301
302 os::javaTimeSystemUTC(seconds, nanos);
303
304 // We're going to verify that the result can fit in a long.
305 // For that we need the difference in seconds between 'seconds'
306 // and 'offset_secs' to be such that:
307 // |seconds - offset_secs| < (2^63/10^9)
308 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
309 // which makes |seconds - offset_secs| < 2^33
310 // and we will prefer +/- 2^32 as the maximum acceptable diff
311 // as 2^32 has a more natural feel than 2^33...
312 //
313 // So if |seconds - offset_secs| >= 2^32 - we return a special
314 // sentinel value (-1) which the caller should take as an
315 // exception value indicating that the offset given to us is
316 // too far from range of the current time - leading to too big
317 // a nano adjustment. The caller is expected to recover by
318 // computing a more accurate offset and calling this method
319 // again. (For the record 2^32 secs is ~136 years, so that
320 // should rarely happen)
321 //
322 jlong diff = seconds - offset_secs;
323 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
324 return -1; // sentinel value: the offset is too far off the target
325 }
326
327 // return the adjustment. If you compute a time by adding
328 // this number of nanoseconds along with the number of seconds
329 // in the offset you should get the current UTC time.
330 return (diff * (jlong)1000000000) + nanos;
331 JVM_END
332
333 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
334 jobject dst, jint dst_pos, jint length))
335 JVMWrapper("JVM_ArrayCopy");
336 // Check if we have null pointers
337 if (src == NULL || dst == NULL) {
338 THROW(vmSymbols::java_lang_NullPointerException());
339 }
340 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
341 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
342 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
343 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
344 // Do copy
345 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
346 JVM_END
347
348
349 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
350 JavaValue r(T_OBJECT);
351 // public synchronized Object put(Object key, Object value);
352 HandleMark hm(THREAD);
353 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
354 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK);
355 JavaCalls::call_virtual(&r,
356 props,
357 SystemDictionary::Properties_klass(),
358 vmSymbols::put_name(),
359 vmSymbols::object_object_object_signature(),
360 key_str,
361 value_str,
362 THREAD);
363 }
364
365
366 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
367
368 /*
369 * Return all of the system properties in a Java String array with alternating
370 * names and values from the jvm SystemProperty.
371 * Which includes some internal and all commandline -D defined properties.
372 */
373 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
374 JVMWrapper("JVM_GetProperties");
375 ResourceMark rm(THREAD);
376 HandleMark hm(THREAD);
377 int ndx = 0;
378 int fixedCount = 2;
379
380 SystemProperty* p = Arguments::system_properties();
381 int count = Arguments::PropertyList_count(p);
382
383 // Allocate result String array
384 InstanceKlass* ik = SystemDictionary::String_klass();
385 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
386 objArrayHandle result_h(THREAD, r);
387
388 while (p != NULL) {
389 const char * key = p->key();
390 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
391 const char * value = p->value();
392 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
393 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK_NULL);
394 result_h->obj_at_put(ndx * 2, key_str());
395 result_h->obj_at_put(ndx * 2 + 1, value_str());
396 ndx++;
397 }
398 p = p->next();
399 }
400
401 // Convert the -XX:MaxDirectMemorySize= command line flag
402 // to the sun.nio.MaxDirectMemorySize property.
403 // Do this after setting user properties to prevent people
404 // from setting the value with a -D option, as requested.
405 // Leave empty if not supplied
406 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
407 char as_chars[256];
408 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
409 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
410 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
411 result_h->obj_at_put(ndx * 2, key_str());
412 result_h->obj_at_put(ndx * 2 + 1, value_str());
413 ndx++;
414 }
415
416 // JVM monitoring and management support
417 // Add the sun.management.compiler property for the compiler's name
418 {
419 #undef CSIZE
420 #if defined(_LP64) || defined(_WIN64)
421 #define CSIZE "64-Bit "
422 #else
423 #define CSIZE
424 #endif // 64bit
425
426 #ifdef TIERED
427 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
428 #else
429 #if defined(COMPILER1)
430 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
431 #elif defined(COMPILER2)
432 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
433 #elif INCLUDE_JVMCI
434 #error "INCLUDE_JVMCI should imply TIERED"
435 #else
436 const char* compiler_name = "";
437 #endif // compilers
438 #endif // TIERED
439
440 if (*compiler_name != '\0' &&
441 (Arguments::mode() != Arguments::_int)) {
442 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
443 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
444 result_h->obj_at_put(ndx * 2, key_str());
445 result_h->obj_at_put(ndx * 2 + 1, value_str());
446 ndx++;
447 }
448 }
449
450 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
451 JVM_END
452
453
454 /*
455 * Return the temporary directory that the VM uses for the attach
456 * and perf data files.
457 *
458 * It is important that this directory is well-known and the
459 * same for all VM instances. It cannot be affected by configuration
460 * variables such as java.io.tmpdir.
461 */
462 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
463 JVMWrapper("JVM_GetTemporaryDirectory");
464 HandleMark hm(THREAD);
465 const char* temp_dir = os::get_temp_directory();
466 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
467 return (jstring) JNIHandles::make_local(THREAD, h());
468 JVM_END
469
470
471 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
472
473 extern volatile jint vm_created;
474
475 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
476 JVMWrapper("JVM_BeforeHalt");
477 // Link all classes for dynamic CDS dumping before vm exit.
478 if (DynamicDumpSharedSpaces) {
479 MetaspaceShared::link_and_cleanup_shared_classes(THREAD);
480 }
481 EventShutdown event;
482 if (event.should_commit()) {
483 event.set_reason("Shutdown requested from Java");
484 event.commit();
485 }
486 JVM_END
487
488
489 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
490 before_exit(thread);
491 vm_exit(code);
492 JVM_END
493
494
495 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
496 JVMWrapper("JVM_GC");
497 if (!DisableExplicitGC) {
498 Universe::heap()->collect(GCCause::_java_lang_system_gc);
499 }
500 JVM_END
501
502
503 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
504 JVMWrapper("JVM_MaxObjectInspectionAge");
505 return Universe::heap()->millis_since_last_whole_heap_examined();
506 JVM_END
507
508
509 static inline jlong convert_size_t_to_jlong(size_t val) {
510 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
511 NOT_LP64 (return (jlong)val;)
512 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
513 }
514
515 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
516 JVMWrapper("JVM_TotalMemory");
517 size_t n = Universe::heap()->capacity();
518 return convert_size_t_to_jlong(n);
519 JVM_END
520
521
522 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
523 JVMWrapper("JVM_FreeMemory");
524 size_t n = Universe::heap()->unused();
525 return convert_size_t_to_jlong(n);
526 JVM_END
527
528
529 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
530 JVMWrapper("JVM_MaxMemory");
531 size_t n = Universe::heap()->max_capacity();
532 return convert_size_t_to_jlong(n);
533 JVM_END
534
535
536 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
537 JVMWrapper("JVM_ActiveProcessorCount");
538 return os::active_processor_count();
539 JVM_END
540
541 JVM_ENTRY_NO_ENV(jboolean, JVM_IsUseContainerSupport(void))
542 JVMWrapper("JVM_IsUseContainerSupport");
543 #ifdef LINUX
544 if (UseContainerSupport) {
545 return JNI_TRUE;
546 }
547 #endif
548 return JNI_FALSE;
549 JVM_END
550
551 // java.lang.Throwable //////////////////////////////////////////////////////
552
553 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
554 JVMWrapper("JVM_FillInStackTrace");
555 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
556 java_lang_Throwable::fill_in_stack_trace(exception);
557 JVM_END
558
559 // java.lang.NullPointerException ///////////////////////////////////////////
560
561 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
562 if (!ShowCodeDetailsInExceptionMessages) return NULL;
563
564 oop exc = JNIHandles::resolve_non_null(throwable);
565
566 Method* method;
567 int bci;
568 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
569 return NULL;
570 }
571 if (method->is_native()) {
572 return NULL;
573 }
574
575 stringStream ss;
576 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
577 if (ok) {
578 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL);
579 return (jstring) JNIHandles::make_local(THREAD, result);
580 } else {
581 return NULL;
582 }
583 JVM_END
584
585 // java.lang.StackTraceElement //////////////////////////////////////////////
586
587
588 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable))
589 JVMWrapper("JVM_InitStackTraceElementArray");
590 Handle exception(THREAD, JNIHandles::resolve(throwable));
591 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
592 objArrayHandle stack_trace(THREAD, st);
593 // Fill in the allocated stack trace
594 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK);
595 JVM_END
596
597
598 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
599 JVMWrapper("JVM_InitStackTraceElement");
600 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
601 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
602 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD);
603 JVM_END
604
605
606 // java.lang.StackWalker //////////////////////////////////////////////////////
607
608
609 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode,
610 jint skip_frames, jint frame_count, jint start_index,
611 jobjectArray frames))
612 JVMWrapper("JVM_CallStackWalk");
613 JavaThread* jt = (JavaThread*) THREAD;
614 if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) {
615 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL);
616 }
617
618 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
619
620 // frames array is a Class<?>[] array when only getting caller reference,
621 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
622 // be null.
623 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
624 objArrayHandle frames_array_h(THREAD, fa);
625
626 int limit = start_index + frame_count;
627 if (frames_array_h->length() < limit) {
628 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL);
629 }
630
631 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count,
632 start_index, frames_array_h, CHECK_NULL);
633 return JNIHandles::make_local(THREAD, result);
634 JVM_END
635
636
637 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor,
638 jint frame_count, jint start_index,
639 jobjectArray frames))
640 JVMWrapper("JVM_MoreStackWalk");
641
642 // frames array is a Class<?>[] array when only getting caller reference,
643 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
644 // be null.
645 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
646 objArrayHandle frames_array_h(THREAD, fa);
647
648 int limit = start_index+frame_count;
649 if (frames_array_h->length() < limit) {
650 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
651 }
652
653 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
654 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count,
655 start_index, frames_array_h, THREAD);
656 JVM_END
657
658 // java.lang.Object ///////////////////////////////////////////////
659
660
661 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
662 JVMWrapper("JVM_IHashCode");
663 // as implemented in the classic virtual machine; return 0 if object is NULL
664 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ;
665 JVM_END
666
667
668 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
669 JVMWrapper("JVM_MonitorWait");
670 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
671 JavaThreadInObjectWaitState jtiows(thread, ms != 0);
672 if (JvmtiExport::should_post_monitor_wait()) {
673 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms);
674
675 // The current thread already owns the monitor and it has not yet
676 // been added to the wait queue so the current thread cannot be
677 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
678 // event handler cannot accidentally consume an unpark() meant for
679 // the ParkEvent associated with this ObjectMonitor.
680 }
681 ObjectSynchronizer::wait(obj, ms, CHECK);
682 JVM_END
683
684
685 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
686 JVMWrapper("JVM_MonitorNotify");
687 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
688 ObjectSynchronizer::notify(obj, CHECK);
689 JVM_END
690
691
692 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
693 JVMWrapper("JVM_MonitorNotifyAll");
694 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
695 ObjectSynchronizer::notifyall(obj, CHECK);
696 JVM_END
697
698
699 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
700 JVMWrapper("JVM_Clone");
701 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
702 Klass* klass = obj->klass();
703 JvmtiVMObjectAllocEventCollector oam;
704
705 #ifdef ASSERT
706 // Just checking that the cloneable flag is set correct
707 if (obj->is_array()) {
708 guarantee(klass->is_cloneable(), "all arrays are cloneable");
709 } else {
710 guarantee(obj->is_instance(), "should be instanceOop");
711 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass());
712 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
713 }
714 #endif
715
716 // Check if class of obj supports the Cloneable interface.
717 // All arrays are considered to be cloneable (See JLS 20.1.5).
718 // All j.l.r.Reference classes are considered non-cloneable.
719 if (!klass->is_cloneable() ||
720 (klass->is_instance_klass() &&
721 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
722 ResourceMark rm(THREAD);
723 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
724 }
725
726 // Make shallow object copy
727 const int size = obj->size();
728 oop new_obj_oop = NULL;
729 if (obj->is_array()) {
730 const int length = ((arrayOop)obj())->length();
731 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
732 /* do_zero */ true, CHECK_NULL);
733 } else {
734 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
735 }
736
737 HeapAccess<>::clone(obj(), new_obj_oop, size);
738
739 Handle new_obj(THREAD, new_obj_oop);
740 // Caution: this involves a java upcall, so the clone should be
741 // "gc-robust" by this stage.
742 if (klass->has_finalizer()) {
743 assert(obj->is_instance(), "should be instanceOop");
744 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
745 new_obj = Handle(THREAD, new_obj_oop);
746 }
747
748 return JNIHandles::make_local(THREAD, new_obj());
749 JVM_END
750
751 // java.io.File ///////////////////////////////////////////////////////////////
752
753 JVM_LEAF(char*, JVM_NativePath(char* path))
754 JVMWrapper("JVM_NativePath");
755 return os::native_path(path);
756 JVM_END
757
758
759 // Misc. class handling ///////////////////////////////////////////////////////////
760
761
762 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
763 JVMWrapper("JVM_GetCallerClass");
764
765 // Getting the class of the caller frame.
766 //
767 // The call stack at this point looks something like this:
768 //
769 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
770 // [1] [ @CallerSensitive API.method ]
771 // [.] [ (skipped intermediate frames) ]
772 // [n] [ caller ]
773 vframeStream vfst(thread);
774 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
775 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
776 Method* m = vfst.method();
777 assert(m != NULL, "sanity");
778 switch (n) {
779 case 0:
780 // This must only be called from Reflection.getCallerClass
781 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
782 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
783 }
784 // fall-through
785 case 1:
786 // Frame 0 and 1 must be caller sensitive.
787 if (!m->caller_sensitive()) {
788 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
789 }
790 break;
791 default:
792 if (!m->is_ignored_by_security_stack_walk()) {
793 // We have reached the desired frame; return the holder class.
794 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror());
795 }
796 break;
797 }
798 }
799 return NULL;
800 JVM_END
801
802
803 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
804 JVMWrapper("JVM_FindPrimitiveClass");
805 oop mirror = NULL;
806 BasicType t = name2type(utf);
807 if (t != T_ILLEGAL && !is_reference_type(t)) {
808 mirror = Universe::java_mirror(t);
809 }
810 if (mirror == NULL) {
811 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
812 } else {
813 return (jclass) JNIHandles::make_local(THREAD, mirror);
814 }
815 JVM_END
816
817
818 // Returns a class loaded by the bootstrap class loader; or null
819 // if not found. ClassNotFoundException is not thrown.
820 // FindClassFromBootLoader is exported to the launcher for windows.
821 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
822 const char* name))
823 JVMWrapper("JVM_FindClassFromBootLoader");
824
825 // Java libraries should ensure that name is never null or illegal.
826 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
827 // It's impossible to create this class; the name cannot fit
828 // into the constant pool.
829 return NULL;
830 }
831 assert(UTF8::is_legal_utf8((const unsigned char*)name, (int)strlen(name), false), "illegal UTF name");
832
833 TempNewSymbol h_name = SymbolTable::new_symbol(name);
834 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
835 if (k == NULL) {
836 return NULL;
837 }
838
839 if (log_is_enabled(Debug, class, resolve)) {
840 trace_class_resolution(k);
841 }
842 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
843 JVM_END
844
845 // Find a class with this name in this loader, using the caller's protection domain.
846 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
847 jboolean init, jobject loader,
848 jclass caller))
849 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException");
850
851 TempNewSymbol h_name =
852 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
853 CHECK_NULL);
854
855 oop loader_oop = JNIHandles::resolve(loader);
856 oop from_class = JNIHandles::resolve(caller);
857 oop protection_domain = NULL;
858 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
859 // NPE. Put it in another way, the bootstrap class loader has all permission and
860 // thus no checkPackageAccess equivalence in the VM class loader.
861 // The caller is also passed as NULL by the java code if there is no security
862 // manager to avoid the performance cost of getting the calling class.
863 if (from_class != NULL && loader_oop != NULL) {
864 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
865 }
866
867 Handle h_loader(THREAD, loader_oop);
868 Handle h_prot(THREAD, protection_domain);
869 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
870 h_prot, false, THREAD);
871
872 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
873 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
874 }
875 return result;
876 JVM_END
877
878 // Currently only called from the old verifier.
879 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
880 jboolean init, jclass from))
881 JVMWrapper("JVM_FindClassFromClass");
882 TempNewSymbol h_name =
883 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
884 CHECK_NULL);
885 oop from_class_oop = JNIHandles::resolve(from);
886 Klass* from_class = (from_class_oop == NULL)
887 ? (Klass*)NULL
888 : java_lang_Class::as_Klass(from_class_oop);
889 oop class_loader = NULL;
890 oop protection_domain = NULL;
891 if (from_class != NULL) {
892 class_loader = from_class->class_loader();
893 protection_domain = from_class->protection_domain();
894 }
895 Handle h_loader(THREAD, class_loader);
896 Handle h_prot (THREAD, protection_domain);
897 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
898 h_prot, true, thread);
899
900 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
901 // this function is generally only used for class loading during verification.
902 ResourceMark rm;
903 oop from_mirror = JNIHandles::resolve_non_null(from);
904 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
905 const char * from_name = from_class->external_name();
906
907 oop mirror = JNIHandles::resolve_non_null(result);
908 Klass* to_class = java_lang_Class::as_Klass(mirror);
909 const char * to = to_class->external_name();
910 log_debug(class, resolve)("%s %s (verification)", from_name, to);
911 }
912
913 return result;
914 JVM_END
915
916 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) {
917 if (loader.is_null()) {
918 return;
919 }
920
921 // check whether the current caller thread holds the lock or not.
922 // If not, increment the corresponding counter
923 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) !=
924 ObjectSynchronizer::owner_self) {
925 counter->inc();
926 }
927 }
928
929 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
930 static jclass jvm_define_class_common(const char *name,
931 jobject loader, const jbyte *buf,
932 jsize len, jobject pd, const char *source,
933 TRAPS) {
934 if (source == NULL) source = "__JVM_DefineClass__";
935
936 assert(THREAD->is_Java_thread(), "must be a JavaThread");
937 JavaThread* jt = (JavaThread*) THREAD;
938
939 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
940 ClassLoader::perf_define_appclass_selftime(),
941 ClassLoader::perf_define_appclasses(),
942 jt->get_thread_stat()->perf_recursion_counts_addr(),
943 jt->get_thread_stat()->perf_timers_addr(),
944 PerfClassTraceTime::DEFINE_CLASS);
945
946 if (UsePerfData) {
947 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
948 }
949
950 // Class resolution will get the class name from the .class stream if the name is null.
951 TempNewSymbol class_name = name == NULL ? NULL :
952 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
953 CHECK_NULL);
954
955 ResourceMark rm(THREAD);
956 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
957 Handle class_loader (THREAD, JNIHandles::resolve(loader));
958 if (UsePerfData) {
959 is_lock_held_by_thread(class_loader,
960 ClassLoader::sync_JVMDefineClassLockFreeCounter(),
961 THREAD);
962 }
963 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
964 Klass* k = SystemDictionary::resolve_from_stream(class_name,
965 class_loader,
966 protection_domain,
967 &st,
968 CHECK_NULL);
969
970 if (log_is_enabled(Debug, class, resolve) && k != NULL) {
971 trace_class_resolution(k);
972 }
973
974 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
975 }
976
977 enum {
978 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
979 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
980 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
981 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
982 };
983
984 /*
985 * Define a class with the specified flags that indicates if it's a nestmate,
986 * hidden, or strongly referenced from class loader.
987 */
988 static jclass jvm_lookup_define_class(jclass lookup, const char *name,
989 const jbyte *buf, jsize len, jobject pd,
990 jboolean init, int flags, jobject classData, TRAPS) {
991 assert(THREAD->is_Java_thread(), "must be a JavaThread");
992 ResourceMark rm(THREAD);
993
994 Klass* lookup_k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(lookup));
995 // Lookup class must be a non-null instance
996 if (lookup_k == NULL) {
997 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
998 }
999 assert(lookup_k->is_instance_klass(), "Lookup class must be an instance klass");
1000
1001 Handle class_loader (THREAD, lookup_k->class_loader());
1002
1003 bool is_nestmate = (flags & NESTMATE) == NESTMATE;
1004 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
1005 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
1006 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
1007
1008 InstanceKlass* host_class = NULL;
1009 if (is_nestmate) {
1010 host_class = InstanceKlass::cast(lookup_k)->nest_host(CHECK_NULL);
1011 }
1012
1013 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
1014 name,
1015 is_nestmate ? "with dynamic nest-host " : "non-nestmate",
1016 is_nestmate ? host_class->external_name() : "",
1017 is_hidden ? "hidden" : "not hidden",
1018 is_strong ? "strong" : "weak",
1019 vm_annotations ? "with vm annotations" : "without vm annotation");
1020
1021 if (!is_hidden) {
1022 // classData is only applicable for hidden classes
1023 if (classData != NULL) {
1024 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
1025 }
1026 if (is_nestmate) {
1027 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
1028 }
1029 if (!is_strong) {
1030 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
1031 }
1032 if (vm_annotations) {
1033 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
1034 }
1035 if (flags != STRONG_LOADER_LINK) {
1036 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1037 err_msg("invalid flag 0x%x", flags));
1038 }
1039 }
1040
1041 // Class resolution will get the class name from the .class stream if the name is null.
1042 TempNewSymbol class_name = name == NULL ? NULL :
1043 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1044 CHECK_NULL);
1045
1046 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1047 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
1048 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
1049
1050 Klass* defined_k;
1051 InstanceKlass* ik = NULL;
1052 if (!is_hidden) {
1053 defined_k = SystemDictionary::resolve_from_stream(class_name,
1054 class_loader,
1055 protection_domain,
1056 &st,
1057 CHECK_NULL);
1058
1059 if (log_is_enabled(Debug, class, resolve) && defined_k != NULL) {
1060 trace_class_resolution(defined_k);
1061 }
1062 ik = InstanceKlass::cast(defined_k);
1063 } else { // hidden
1064 Handle classData_h(THREAD, JNIHandles::resolve(classData));
1065 ClassLoadInfo cl_info(protection_domain,
1066 NULL, // unsafe_anonymous_host
1067 NULL, // cp_patches
1068 host_class,
1069 classData_h,
1070 is_hidden,
1071 is_strong,
1072 vm_annotations);
1073 defined_k = SystemDictionary::parse_stream(class_name,
1074 class_loader,
1075 &st,
1076 cl_info,
1077 CHECK_NULL);
1078 if (defined_k == NULL) {
1079 THROW_MSG_0(vmSymbols::java_lang_Error(), "Failure to define a hidden class");
1080 }
1081
1082 ik = InstanceKlass::cast(defined_k);
1083
1084 // The hidden class loader data has been artificially been kept alive to
1085 // this point. The mirror and any instances of this class have to keep
1086 // it alive afterwards.
1087 ik->class_loader_data()->dec_keep_alive();
1088
1089 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1090 ModuleEntry* module = ik->module();
1091 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1092 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1093 module_name,
1094 ik->external_name(),
1095 host_class->external_name(),
1096 ik->is_hidden() ? "is hidden" : "is not hidden");
1097 }
1098 }
1099 assert(Reflection::is_same_class_package(lookup_k, defined_k),
1100 "lookup class and defined class are in different packages");
1101
1102 if (init) {
1103 ik->initialize(CHECK_NULL);
1104 } else {
1105 ik->link_class(CHECK_NULL);
1106 }
1107
1108 return (jclass) JNIHandles::make_local(THREAD, defined_k->java_mirror());
1109 }
1110
1111 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1112 JVMWrapper("JVM_DefineClass");
1113
1114 return jvm_define_class_common(name, loader, buf, len, pd, NULL, THREAD);
1115 JVM_END
1116
1117 /*
1118 * Define a class with the specified lookup class.
1119 * lookup: Lookup class
1120 * name: the name of the class
1121 * buf: class bytes
1122 * len: length of class bytes
1123 * pd: protection domain
1124 * init: initialize the class
1125 * flags: properties of the class
1126 * classData: private static pre-initialized field
1127 */
1128 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1129 jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1130 JVMWrapper("JVM_LookupDefineClass");
1131
1132 if (lookup == NULL) {
1133 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1134 }
1135
1136 assert(buf != NULL, "buf must not be NULL");
1137
1138 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1139 JVM_END
1140
1141 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1142 JVMWrapper("JVM_DefineClassWithSource");
1143
1144 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD);
1145 JVM_END
1146
1147 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1148 JVMWrapper("JVM_FindLoadedClass");
1149 ResourceMark rm(THREAD);
1150
1151 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1152 char* str = java_lang_String::as_utf8_string(h_name());
1153
1154 // Sanity check, don't expect null
1155 if (str == NULL) return NULL;
1156
1157 // Internalize the string, converting '.' to '/' in string.
1158 char* p = (char*)str;
1159 while (*p != '\0') {
1160 if (*p == '.') {
1161 *p = '/';
1162 }
1163 p++;
1164 }
1165
1166 const int str_len = (int)(p - str);
1167 if (str_len > Symbol::max_length()) {
1168 // It's impossible to create this class; the name cannot fit
1169 // into the constant pool.
1170 return NULL;
1171 }
1172 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1173
1174 // Security Note:
1175 // The Java level wrapper will perform the necessary security check allowing
1176 // us to pass the NULL as the initiating class loader.
1177 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1178 if (UsePerfData) {
1179 is_lock_held_by_thread(h_loader,
1180 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(),
1181 THREAD);
1182 }
1183
1184 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name,
1185 h_loader,
1186 Handle(),
1187 CHECK_NULL);
1188 #if INCLUDE_CDS
1189 if (k == NULL) {
1190 // If the class is not already loaded, try to see if it's in the shared
1191 // archive for the current classloader (h_loader).
1192 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1193 }
1194 #endif
1195 return (k == NULL) ? NULL :
1196 (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1197 JVM_END
1198
1199 // Module support //////////////////////////////////////////////////////////////////////////////
1200
1201 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1202 jstring location, jobjectArray packages))
1203 JVMWrapper("JVM_DefineModule");
1204 Modules::define_module(module, is_open, version, location, packages, CHECK);
1205 JVM_END
1206
1207 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1208 JVMWrapper("JVM_SetBootLoaderUnnamedModule");
1209 Modules::set_bootloader_unnamed_module(module, CHECK);
1210 JVM_END
1211
1212 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1213 JVMWrapper("JVM_AddModuleExports");
1214 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK);
1215 JVM_END
1216
1217 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1218 JVMWrapper("JVM_AddModuleExportsToAllUnnamed");
1219 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK);
1220 JVM_END
1221
1222 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1223 JVMWrapper("JVM_AddModuleExportsToAll");
1224 Modules::add_module_exports(from_module, package, NULL, CHECK);
1225 JVM_END
1226
1227 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1228 JVMWrapper("JVM_AddReadsModule");
1229 Modules::add_reads_module(from_module, source_module, CHECK);
1230 JVM_END
1231
1232 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader))
1233 JVMWrapper("JVM_DefineArchivedModules");
1234 Modules::define_archived_modules(platform_loader, system_loader, CHECK);
1235 JVM_END
1236
1237 // Reflection support //////////////////////////////////////////////////////////////////////////////
1238
1239 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1240 assert (cls != NULL, "illegal class");
1241 JVMWrapper("JVM_InitClassName");
1242 JvmtiVMObjectAllocEventCollector oam;
1243 ResourceMark rm(THREAD);
1244 HandleMark hm(THREAD);
1245 Handle java_class(THREAD, JNIHandles::resolve(cls));
1246 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1247 return (jstring) JNIHandles::make_local(THREAD, result);
1248 JVM_END
1249
1250
1251 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1252 JVMWrapper("JVM_GetClassInterfaces");
1253 JvmtiVMObjectAllocEventCollector oam;
1254 oop mirror = JNIHandles::resolve_non_null(cls);
1255
1256 // Special handling for primitive objects
1257 if (java_lang_Class::is_primitive(mirror)) {
1258 // Primitive objects does not have any interfaces
1259 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1260 return (jobjectArray) JNIHandles::make_local(THREAD, r);
1261 }
1262
1263 Klass* klass = java_lang_Class::as_Klass(mirror);
1264 // Figure size of result array
1265 int size;
1266 if (klass->is_instance_klass()) {
1267 size = InstanceKlass::cast(klass)->local_interfaces()->length();
1268 } else {
1269 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1270 size = 2;
1271 }
1272
1273 // Allocate result array
1274 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL);
1275 objArrayHandle result (THREAD, r);
1276 // Fill in result
1277 if (klass->is_instance_klass()) {
1278 // Regular instance klass, fill in all local interfaces
1279 for (int index = 0; index < size; index++) {
1280 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1281 result->obj_at_put(index, k->java_mirror());
1282 }
1283 } else {
1284 // All arrays implement java.lang.Cloneable and java.io.Serializable
1285 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror());
1286 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror());
1287 }
1288 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1289 JVM_END
1290
1291
1292 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1293 JVMWrapper("JVM_IsInterface");
1294 oop mirror = JNIHandles::resolve_non_null(cls);
1295 if (java_lang_Class::is_primitive(mirror)) {
1296 return JNI_FALSE;
1297 }
1298 Klass* k = java_lang_Class::as_Klass(mirror);
1299 jboolean result = k->is_interface();
1300 assert(!result || k->is_instance_klass(),
1301 "all interfaces are instance types");
1302 // The compiler intrinsic for isInterface tests the
1303 // Klass::_access_flags bits in the same way.
1304 return result;
1305 JVM_END
1306
1307 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1308 JVMWrapper("JVM_IsHiddenClass");
1309 oop mirror = JNIHandles::resolve_non_null(cls);
1310 if (java_lang_Class::is_primitive(mirror)) {
1311 return JNI_FALSE;
1312 }
1313 Klass* k = java_lang_Class::as_Klass(mirror);
1314 return k->is_hidden();
1315 JVM_END
1316
1317 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1318 JVMWrapper("JVM_GetClassSigners");
1319 JvmtiVMObjectAllocEventCollector oam;
1320 oop mirror = JNIHandles::resolve_non_null(cls);
1321 if (java_lang_Class::is_primitive(mirror)) {
1322 // There are no signers for primitive types
1323 return NULL;
1324 }
1325
1326 objArrayHandle signers(THREAD, java_lang_Class::signers(mirror));
1327
1328 // If there are no signers set in the class, or if the class
1329 // is an array, return NULL.
1330 if (signers == NULL) return NULL;
1331
1332 // copy of the signers array
1333 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1334 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1335 for (int index = 0; index < signers->length(); index++) {
1336 signers_copy->obj_at_put(index, signers->obj_at(index));
1337 }
1338
1339 // return the copy
1340 return (jobjectArray) JNIHandles::make_local(THREAD, signers_copy);
1341 JVM_END
1342
1343
1344 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1345 JVMWrapper("JVM_SetClassSigners");
1346 oop mirror = JNIHandles::resolve_non_null(cls);
1347 if (!java_lang_Class::is_primitive(mirror)) {
1348 // This call is ignored for primitive types and arrays.
1349 // Signers are only set once, ClassLoader.java, and thus shouldn't
1350 // be called with an array. Only the bootstrap loader creates arrays.
1351 Klass* k = java_lang_Class::as_Klass(mirror);
1352 if (k->is_instance_klass()) {
1353 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1354 }
1355 }
1356 JVM_END
1357
1358
1359 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1360 JVMWrapper("JVM_GetProtectionDomain");
1361 oop mirror = JNIHandles::resolve_non_null(cls);
1362 if (mirror == NULL) {
1363 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1364 }
1365
1366 if (java_lang_Class::is_primitive(mirror)) {
1367 // Primitive types does not have a protection domain.
1368 return NULL;
1369 }
1370
1371 oop pd = java_lang_Class::protection_domain(mirror);
1372 return (jobject) JNIHandles::make_local(THREAD, pd);
1373 JVM_END
1374
1375
1376 // Returns the inherited_access_control_context field of the running thread.
1377 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1378 JVMWrapper("JVM_GetInheritedAccessControlContext");
1379 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1380 return JNIHandles::make_local(THREAD, result);
1381 JVM_END
1382
1383 class RegisterArrayForGC {
1384 private:
1385 JavaThread *_thread;
1386 public:
1387 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) {
1388 _thread = thread;
1389 _thread->register_array_for_gc(array);
1390 }
1391
1392 ~RegisterArrayForGC() {
1393 _thread->register_array_for_gc(NULL);
1394 }
1395 };
1396
1397
1398 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1399 JVMWrapper("JVM_GetStackAccessControlContext");
1400 if (!UsePrivilegedStack) return NULL;
1401
1402 ResourceMark rm(THREAD);
1403 GrowableArray<oop>* local_array = new GrowableArray<oop>(12);
1404 JvmtiVMObjectAllocEventCollector oam;
1405
1406 // count the protection domains on the execution stack. We collapse
1407 // duplicate consecutive protection domains into a single one, as
1408 // well as stopping when we hit a privileged frame.
1409
1410 oop previous_protection_domain = NULL;
1411 Handle privileged_context(thread, NULL);
1412 bool is_privileged = false;
1413 oop protection_domain = NULL;
1414
1415 // Iterate through Java frames
1416 vframeStream vfst(thread);
1417 for(; !vfst.at_end(); vfst.next()) {
1418 // get method of frame
1419 Method* method = vfst.method();
1420
1421 // stop at the first privileged frame
1422 if (method->method_holder() == SystemDictionary::AccessController_klass() &&
1423 method->name() == vmSymbols::executePrivileged_name())
1424 {
1425 // this frame is privileged
1426 is_privileged = true;
1427
1428 javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged
1429
1430 StackValueCollection* locals = priv->locals();
1431 StackValue* ctx_sv = locals->at(1); // AccessControlContext context
1432 StackValue* clr_sv = locals->at(2); // Class<?> caller
1433 assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1434 assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1435 privileged_context = ctx_sv->get_obj();
1436 Handle caller = clr_sv->get_obj();
1437
1438 Klass *caller_klass = java_lang_Class::as_Klass(caller());
1439 protection_domain = caller_klass->protection_domain();
1440 } else {
1441 protection_domain = method->method_holder()->protection_domain();
1442 }
1443
1444 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) {
1445 local_array->push(protection_domain);
1446 previous_protection_domain = protection_domain;
1447 }
1448
1449 if (is_privileged) break;
1450 }
1451
1452
1453 // either all the domains on the stack were system domains, or
1454 // we had a privileged system domain
1455 if (local_array->is_empty()) {
1456 if (is_privileged && privileged_context.is_null()) return NULL;
1457
1458 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1459 return JNIHandles::make_local(THREAD, result);
1460 }
1461
1462 // the resource area must be registered in case of a gc
1463 RegisterArrayForGC ragc(thread, local_array);
1464 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(),
1465 local_array->length(), CHECK_NULL);
1466 objArrayHandle h_context(thread, context);
1467 for (int index = 0; index < local_array->length(); index++) {
1468 h_context->obj_at_put(index, local_array->at(index));
1469 }
1470
1471 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1472
1473 return JNIHandles::make_local(THREAD, result);
1474 JVM_END
1475
1476
1477 JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1478 JVMWrapper("JVM_IsArrayClass");
1479 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1480 return (k != NULL) && k->is_array_klass() ? true : false;
1481 JVM_END
1482
1483
1484 JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1485 JVMWrapper("JVM_IsPrimitiveClass");
1486 oop mirror = JNIHandles::resolve_non_null(cls);
1487 return (jboolean) java_lang_Class::is_primitive(mirror);
1488 JVM_END
1489
1490
1491 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1492 JVMWrapper("JVM_GetClassModifiers");
1493 oop mirror = JNIHandles::resolve_non_null(cls);
1494 if (java_lang_Class::is_primitive(mirror)) {
1495 // Primitive type
1496 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1497 }
1498
1499 Klass* k = java_lang_Class::as_Klass(mirror);
1500 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0));
1501 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1502 return k->modifier_flags();
1503 JVM_END
1504
1505
1506 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1507
1508 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1509 JvmtiVMObjectAllocEventCollector oam;
1510 // ofClass is a reference to a java_lang_Class object. The mirror object
1511 // of an InstanceKlass
1512 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1513 if (java_lang_Class::is_primitive(ofMirror) ||
1514 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) {
1515 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1516 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1517 }
1518
1519 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1520 InnerClassesIterator iter(k);
1521
1522 if (iter.length() == 0) {
1523 // Neither an inner nor outer class
1524 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1525 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1526 }
1527
1528 // find inner class info
1529 constantPoolHandle cp(thread, k->constants());
1530 int length = iter.length();
1531
1532 // Allocate temp. result array
1533 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL);
1534 objArrayHandle result (THREAD, r);
1535 int members = 0;
1536
1537 for (; !iter.done(); iter.next()) {
1538 int ioff = iter.inner_class_info_index();
1539 int ooff = iter.outer_class_info_index();
1540
1541 if (ioff != 0 && ooff != 0) {
1542 // Check to see if the name matches the class we're looking for
1543 // before attempting to find the class.
1544 if (cp->klass_name_at_matches(k, ooff)) {
1545 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1546 if (outer_klass == k) {
1547 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1548 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1549
1550 // Throws an exception if outer klass has not declared k as
1551 // an inner klass
1552 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1553
1554 result->obj_at_put(members, inner_klass->java_mirror());
1555 members++;
1556 }
1557 }
1558 }
1559 }
1560
1561 if (members != length) {
1562 // Return array of right length
1563 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL);
1564 for(int i = 0; i < members; i++) {
1565 res->obj_at_put(i, result->obj_at(i));
1566 }
1567 return (jobjectArray)JNIHandles::make_local(THREAD, res);
1568 }
1569
1570 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1571 JVM_END
1572
1573
1574 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1575 {
1576 // ofClass is a reference to a java_lang_Class object.
1577 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1578 if (java_lang_Class::is_primitive(ofMirror)) {
1579 return NULL;
1580 }
1581 Klass* klass = java_lang_Class::as_Klass(ofMirror);
1582 if (!klass->is_instance_klass()) {
1583 return NULL;
1584 }
1585
1586 bool inner_is_member = false;
1587 Klass* outer_klass
1588 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1589 if (outer_klass == NULL) return NULL; // already a top-level class
1590 if (!inner_is_member) return NULL; // a hidden or unsafe anonymous class (inside a method)
1591 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror());
1592 }
1593 JVM_END
1594
1595 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1596 {
1597 oop mirror = JNIHandles::resolve_non_null(cls);
1598 if (java_lang_Class::is_primitive(mirror)) {
1599 return NULL;
1600 }
1601 Klass* klass = java_lang_Class::as_Klass(mirror);
1602 if (!klass->is_instance_klass()) {
1603 return NULL;
1604 }
1605 InstanceKlass* k = InstanceKlass::cast(klass);
1606 int ooff = 0, noff = 0;
1607 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1608 if (noff != 0) {
1609 constantPoolHandle i_cp(thread, k->constants());
1610 Symbol* name = i_cp->symbol_at(noff);
1611 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1612 return (jstring) JNIHandles::make_local(THREAD, str());
1613 }
1614 }
1615 return NULL;
1616 }
1617 JVM_END
1618
1619 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1620 assert (cls != NULL, "illegal class");
1621 JVMWrapper("JVM_GetClassSignature");
1622 JvmtiVMObjectAllocEventCollector oam;
1623 ResourceMark rm(THREAD);
1624 oop mirror = JNIHandles::resolve_non_null(cls);
1625 // Return null for arrays and primatives
1626 if (!java_lang_Class::is_primitive(mirror)) {
1627 Klass* k = java_lang_Class::as_Klass(mirror);
1628 if (k->is_instance_klass()) {
1629 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1630 if (sym == NULL) return NULL;
1631 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1632 return (jstring) JNIHandles::make_local(THREAD, str());
1633 }
1634 }
1635 return NULL;
1636 JVM_END
1637
1638
1639 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1640 assert (cls != NULL, "illegal class");
1641 JVMWrapper("JVM_GetClassAnnotations");
1642 oop mirror = JNIHandles::resolve_non_null(cls);
1643 // Return null for arrays and primitives
1644 if (!java_lang_Class::is_primitive(mirror)) {
1645 Klass* k = java_lang_Class::as_Klass(mirror);
1646 if (k->is_instance_klass()) {
1647 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1648 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1649 }
1650 }
1651 return NULL;
1652 JVM_END
1653
1654
1655 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) {
1656 // some of this code was adapted from from jni_FromReflectedField
1657
1658 oop reflected = JNIHandles::resolve_non_null(field);
1659 oop mirror = java_lang_reflect_Field::clazz(reflected);
1660 Klass* k = java_lang_Class::as_Klass(mirror);
1661 int slot = java_lang_reflect_Field::slot(reflected);
1662 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1663
1664 InstanceKlass* ik = InstanceKlass::cast(k);
1665 intptr_t offset = ik->field_offset(slot);
1666
1667 if (modifiers & JVM_ACC_STATIC) {
1668 // for static fields we only look in the current class
1669 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1670 assert(false, "cannot find static field");
1671 return false;
1672 }
1673 } else {
1674 // for instance fields we start with the current class and work
1675 // our way up through the superclass chain
1676 if (!ik->find_field_from_offset(offset, false, &fd)) {
1677 assert(false, "cannot find instance field");
1678 return false;
1679 }
1680 }
1681 return true;
1682 }
1683
1684 static Method* jvm_get_method_common(jobject method) {
1685 // some of this code was adapted from from jni_FromReflectedMethod
1686
1687 oop reflected = JNIHandles::resolve_non_null(method);
1688 oop mirror = NULL;
1689 int slot = 0;
1690
1691 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
1692 mirror = java_lang_reflect_Constructor::clazz(reflected);
1693 slot = java_lang_reflect_Constructor::slot(reflected);
1694 } else {
1695 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(),
1696 "wrong type");
1697 mirror = java_lang_reflect_Method::clazz(reflected);
1698 slot = java_lang_reflect_Method::slot(reflected);
1699 }
1700 Klass* k = java_lang_Class::as_Klass(mirror);
1701
1702 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1703 assert(m != NULL, "cannot find method");
1704 return m; // caller has to deal with NULL in product mode
1705 }
1706
1707 /* Type use annotations support (JDK 1.8) */
1708
1709 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1710 assert (cls != NULL, "illegal class");
1711 JVMWrapper("JVM_GetClassTypeAnnotations");
1712 ResourceMark rm(THREAD);
1713 // Return null for arrays and primitives
1714 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1715 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1716 if (k->is_instance_klass()) {
1717 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1718 if (type_annotations != NULL) {
1719 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1720 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1721 }
1722 }
1723 }
1724 return NULL;
1725 JVM_END
1726
1727 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1728 assert (method != NULL, "illegal method");
1729 JVMWrapper("JVM_GetMethodTypeAnnotations");
1730
1731 // method is a handle to a java.lang.reflect.Method object
1732 Method* m = jvm_get_method_common(method);
1733 if (m == NULL) {
1734 return NULL;
1735 }
1736
1737 AnnotationArray* type_annotations = m->type_annotations();
1738 if (type_annotations != NULL) {
1739 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1740 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1741 }
1742
1743 return NULL;
1744 JVM_END
1745
1746 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1747 assert (field != NULL, "illegal field");
1748 JVMWrapper("JVM_GetFieldTypeAnnotations");
1749
1750 fieldDescriptor fd;
1751 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1752 if (!gotFd) {
1753 return NULL;
1754 }
1755
1756 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD));
1757 JVM_END
1758
1759 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1760 if (!cp->is_within_bounds(index)) {
1761 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1762 }
1763 }
1764
1765 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1766 {
1767 JVMWrapper("JVM_GetMethodParameters");
1768 // method is a handle to a java.lang.reflect.Method object
1769 Method* method_ptr = jvm_get_method_common(method);
1770 methodHandle mh (THREAD, method_ptr);
1771 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1772 const int num_params = mh->method_parameters_length();
1773
1774 if (num_params < 0) {
1775 // A -1 return value from method_parameters_length means there is no
1776 // parameter data. Return null to indicate this to the reflection
1777 // API.
1778 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1779 return (jobjectArray)NULL;
1780 } else {
1781 // Otherwise, we return something up to reflection, even if it is
1782 // a zero-length array. Why? Because in some cases this can
1783 // trigger a MalformedParametersException.
1784
1785 // make sure all the symbols are properly formatted
1786 for (int i = 0; i < num_params; i++) {
1787 MethodParametersElement* params = mh->method_parameters_start();
1788 int index = params[i].name_cp_index;
1789 constantPoolHandle cp(THREAD, mh->constants());
1790 bounds_check(cp, index, CHECK_NULL);
1791
1792 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1793 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1794 "Wrong type at constant pool index");
1795 }
1796
1797 }
1798
1799 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL);
1800 objArrayHandle result (THREAD, result_oop);
1801
1802 for (int i = 0; i < num_params; i++) {
1803 MethodParametersElement* params = mh->method_parameters_start();
1804 // For a 0 index, give a NULL symbol
1805 Symbol* sym = 0 != params[i].name_cp_index ?
1806 mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1807 int flags = params[i].flags;
1808 oop param = Reflection::new_parameter(reflected_method, i, sym,
1809 flags, CHECK_NULL);
1810 result->obj_at_put(i, param);
1811 }
1812 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1813 }
1814 }
1815 JVM_END
1816
1817 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1818
1819 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1820 {
1821 JVMWrapper("JVM_GetClassDeclaredFields");
1822 JvmtiVMObjectAllocEventCollector oam;
1823
1824 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1825 // Exclude primitive types and array types
1826 if (java_lang_Class::is_primitive(ofMirror) ||
1827 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1828 // Return empty array
1829 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL);
1830 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1831 }
1832
1833 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1834 constantPoolHandle cp(THREAD, k->constants());
1835
1836 // Ensure class is linked
1837 k->link_class(CHECK_NULL);
1838
1839 // Allocate result
1840 int num_fields;
1841
1842 if (publicOnly) {
1843 num_fields = 0;
1844 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1845 if (fs.access_flags().is_public()) ++num_fields;
1846 }
1847 } else {
1848 num_fields = k->java_fields_count();
1849 }
1850
1851 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL);
1852 objArrayHandle result (THREAD, r);
1853
1854 int out_idx = 0;
1855 fieldDescriptor fd;
1856 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1857 if (!publicOnly || fs.access_flags().is_public()) {
1858 fd.reinitialize(k, fs.index());
1859 oop field = Reflection::new_field(&fd, CHECK_NULL);
1860 result->obj_at_put(out_idx, field);
1861 ++out_idx;
1862 }
1863 }
1864 assert(out_idx == num_fields, "just checking");
1865 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1866 }
1867 JVM_END
1868
1869 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1870 {
1871 JVMWrapper("JVM_IsRecord");
1872 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1873 if (k != NULL && k->is_instance_klass()) {
1874 InstanceKlass* ik = InstanceKlass::cast(k);
1875 return ik->is_record();
1876 } else {
1877 return false;
1878 }
1879 }
1880 JVM_END
1881
1882 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1883 {
1884 JVMWrapper("JVM_GetRecordComponents");
1885 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass));
1886 assert(c->is_instance_klass(), "must be");
1887 InstanceKlass* ik = InstanceKlass::cast(c);
1888
1889 if (ik->is_record()) {
1890 Array<RecordComponent*>* components = ik->record_components();
1891 assert(components != NULL, "components should not be NULL");
1892 {
1893 JvmtiVMObjectAllocEventCollector oam;
1894 constantPoolHandle cp(THREAD, ik->constants());
1895 int length = components->length();
1896 assert(length >= 0, "unexpected record_components length");
1897 objArrayOop record_components =
1898 oopFactory::new_objArray(SystemDictionary::RecordComponent_klass(), length, CHECK_NULL);
1899 objArrayHandle components_h (THREAD, record_components);
1900
1901 for (int x = 0; x < length; x++) {
1902 RecordComponent* component = components->at(x);
1903 assert(component != NULL, "unexpected NULL record component");
1904 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1905 components_h->obj_at_put(x, component_oop);
1906 }
1907 return (jobjectArray)JNIHandles::make_local(THREAD, components_h());
1908 }
1909 }
1910
1911 // Return empty array if ofClass is not a record.
1912 objArrayOop result = oopFactory::new_objArray(SystemDictionary::RecordComponent_klass(), 0, CHECK_NULL);
1913 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1914 }
1915 JVM_END
1916
1917 static bool select_method(const methodHandle& method, bool want_constructor) {
1918 if (want_constructor) {
1919 return (method->is_initializer() && !method->is_static());
1920 } else {
1921 return (!method->is_initializer() && !method->is_overpass());
1922 }
1923 }
1924
1925 static jobjectArray get_class_declared_methods_helper(
1926 JNIEnv *env,
1927 jclass ofClass, jboolean publicOnly,
1928 bool want_constructor,
1929 Klass* klass, TRAPS) {
1930
1931 JvmtiVMObjectAllocEventCollector oam;
1932
1933 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1934 // Exclude primitive types and array types
1935 if (java_lang_Class::is_primitive(ofMirror)
1936 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1937 // Return empty array
1938 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1939 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1940 }
1941
1942 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1943
1944 // Ensure class is linked
1945 k->link_class(CHECK_NULL);
1946
1947 Array<Method*>* methods = k->methods();
1948 int methods_length = methods->length();
1949
1950 // Save original method_idnum in case of redefinition, which can change
1951 // the idnum of obsolete methods. The new method will have the same idnum
1952 // but if we refresh the methods array, the counts will be wrong.
1953 ResourceMark rm(THREAD);
1954 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1955 int num_methods = 0;
1956
1957 for (int i = 0; i < methods_length; i++) {
1958 methodHandle method(THREAD, methods->at(i));
1959 if (select_method(method, want_constructor)) {
1960 if (!publicOnly || method->is_public()) {
1961 idnums->push(method->method_idnum());
1962 ++num_methods;
1963 }
1964 }
1965 }
1966
1967 // Allocate result
1968 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1969 objArrayHandle result (THREAD, r);
1970
1971 // Now just put the methods that we selected above, but go by their idnum
1972 // in case of redefinition. The methods can be redefined at any safepoint,
1973 // so above when allocating the oop array and below when creating reflect
1974 // objects.
1975 for (int i = 0; i < num_methods; i++) {
1976 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1977 if (method.is_null()) {
1978 // Method may have been deleted and seems this API can handle null
1979 // Otherwise should probably put a method that throws NSME
1980 result->obj_at_put(i, NULL);
1981 } else {
1982 oop m;
1983 if (want_constructor) {
1984 m = Reflection::new_constructor(method, CHECK_NULL);
1985 } else {
1986 m = Reflection::new_method(method, false, CHECK_NULL);
1987 }
1988 result->obj_at_put(i, m);
1989 }
1990 }
1991
1992 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1993 }
1994
1995 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1996 {
1997 JVMWrapper("JVM_GetClassDeclaredMethods");
1998 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1999 /*want_constructor*/ false,
2000 SystemDictionary::reflect_Method_klass(), THREAD);
2001 }
2002 JVM_END
2003
2004 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
2005 {
2006 JVMWrapper("JVM_GetClassDeclaredConstructors");
2007 return get_class_declared_methods_helper(env, ofClass, publicOnly,
2008 /*want_constructor*/ true,
2009 SystemDictionary::reflect_Constructor_klass(), THREAD);
2010 }
2011 JVM_END
2012
2013 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
2014 {
2015 JVMWrapper("JVM_GetClassAccessFlags");
2016 oop mirror = JNIHandles::resolve_non_null(cls);
2017 if (java_lang_Class::is_primitive(mirror)) {
2018 // Primitive type
2019 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
2020 }
2021
2022 Klass* k = java_lang_Class::as_Klass(mirror);
2023 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
2024 }
2025 JVM_END
2026
2027 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
2028 {
2029 JVMWrapper("JVM_AreNestMates");
2030 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
2031 assert(c->is_instance_klass(), "must be");
2032 InstanceKlass* ck = InstanceKlass::cast(c);
2033 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member));
2034 assert(m->is_instance_klass(), "must be");
2035 InstanceKlass* mk = InstanceKlass::cast(m);
2036 return ck->has_nestmate_access_to(mk, THREAD);
2037 }
2038 JVM_END
2039
2040 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
2041 {
2042 // current is not a primitive or array class
2043 JVMWrapper("JVM_GetNestHost");
2044 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
2045 assert(c->is_instance_klass(), "must be");
2046 InstanceKlass* ck = InstanceKlass::cast(c);
2047 InstanceKlass* host = ck->nest_host(THREAD);
2048 return (jclass) (host == NULL ? NULL :
2049 JNIHandles::make_local(THREAD, host->java_mirror()));
2050 }
2051 JVM_END
2052
2053 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
2054 {
2055 // current is not a primitive or array class
2056 JVMWrapper("JVM_GetNestMembers");
2057 ResourceMark rm(THREAD);
2058 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
2059 assert(c->is_instance_klass(), "must be");
2060 InstanceKlass* ck = InstanceKlass::cast(c);
2061 InstanceKlass* host = ck->nest_host(THREAD);
2062
2063 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
2064 ck->external_name(), host->external_name());
2065 {
2066 JvmtiVMObjectAllocEventCollector oam;
2067 Array<u2>* members = host->nest_members();
2068 int length = members == NULL ? 0 : members->length();
2069
2070 log_trace(class, nestmates)(" - host has %d listed nest members", length);
2071
2072 // nest host is first in the array so make it one bigger
2073 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(),
2074 length + 1, CHECK_NULL);
2075 objArrayHandle result(THREAD, r);
2076 result->obj_at_put(0, host->java_mirror());
2077 if (length != 0) {
2078 int count = 0;
2079 for (int i = 0; i < length; i++) {
2080 int cp_index = members->at(i);
2081 Klass* k = host->constants()->klass_at(cp_index, THREAD);
2082 if (HAS_PENDING_EXCEPTION) {
2083 if (PENDING_EXCEPTION->is_a(SystemDictionary::VirtualMachineError_klass())) {
2084 return NULL; // propagate VMEs
2085 }
2086 if (log_is_enabled(Trace, class, nestmates)) {
2087 stringStream ss;
2088 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
2089 ss.print(" - resolution of nest member %s failed: ", target_member_class);
2090 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2091 log_trace(class, nestmates)("%s", ss.as_string());
2092 }
2093 CLEAR_PENDING_EXCEPTION;
2094 continue;
2095 }
2096 if (k->is_instance_klass()) {
2097 InstanceKlass* ik = InstanceKlass::cast(k);
2098 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
2099 if (nest_host_k == host) {
2100 result->obj_at_put(count+1, k->java_mirror());
2101 count++;
2102 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
2103 } else {
2104 log_trace(class, nestmates)(" - skipping member %s with different host %s",
2105 ik->external_name(), nest_host_k->external_name());
2106 }
2107 } else {
2108 log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
2109 k->external_name());
2110 }
2111 }
2112 if (count < length) {
2113 // we had invalid entries so we need to compact the array
2114 log_trace(class, nestmates)(" - compacting array from length %d to %d",
2115 length + 1, count + 1);
2116
2117 objArrayOop r2 = oopFactory::new_objArray(SystemDictionary::Class_klass(),
2118 count + 1, CHECK_NULL);
2119 objArrayHandle result2(THREAD, r2);
2120 for (int i = 0; i < count + 1; i++) {
2121 result2->obj_at_put(i, result->obj_at(i));
2122 }
2123 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2124 }
2125 }
2126 else {
2127 assert(host == ck || ck->is_hidden(), "must be singleton nest or dynamic nestmate");
2128 }
2129 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2130 }
2131 }
2132 JVM_END
2133
2134 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
2135 {
2136 JVMWrapper("JVM_GetPermittedSubclasses");
2137 oop mirror = JNIHandles::resolve_non_null(current);
2138 assert(!java_lang_Class::is_primitive(mirror), "should not be");
2139 Klass* c = java_lang_Class::as_Klass(mirror);
2140 assert(c->is_instance_klass(), "must be");
2141 InstanceKlass* ik = InstanceKlass::cast(c);
2142 {
2143 JvmtiVMObjectAllocEventCollector oam;
2144 Array<u2>* subclasses = ik->permitted_subclasses();
2145 int length = subclasses == NULL ? 0 : subclasses->length();
2146 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
2147 length, CHECK_NULL);
2148 objArrayHandle result(THREAD, r);
2149 for (int i = 0; i < length; i++) {
2150 int cp_index = subclasses->at(i);
2151 // This returns <package-name>/<class-name>.
2152 Symbol* klass_name = ik->constants()->klass_name_at(cp_index);
2153 assert(klass_name != NULL, "Unexpected null klass_name");
2154 Handle perm_subtype_h = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2155 result->obj_at_put(i, perm_subtype_h());
2156 }
2157 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2158 }
2159 }
2160 JVM_END
2161
2162 // Constant pool access //////////////////////////////////////////////////////////
2163
2164 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2165 {
2166 JVMWrapper("JVM_GetClassConstantPool");
2167 JvmtiVMObjectAllocEventCollector oam;
2168 oop mirror = JNIHandles::resolve_non_null(cls);
2169 // Return null for primitives and arrays
2170 if (!java_lang_Class::is_primitive(mirror)) {
2171 Klass* k = java_lang_Class::as_Klass(mirror);
2172 if (k->is_instance_klass()) {
2173 InstanceKlass* k_h = InstanceKlass::cast(k);
2174 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2175 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2176 return JNIHandles::make_local(THREAD, jcp());
2177 }
2178 }
2179 return NULL;
2180 }
2181 JVM_END
2182
2183
2184 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
2185 {
2186 JVMWrapper("JVM_ConstantPoolGetSize");
2187 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2188 return cp->length();
2189 }
2190 JVM_END
2191
2192
2193 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2194 {
2195 JVMWrapper("JVM_ConstantPoolGetClassAt");
2196 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2197 bounds_check(cp, index, CHECK_NULL);
2198 constantTag tag = cp->tag_at(index);
2199 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2200 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2201 }
2202 Klass* k = cp->klass_at(index, CHECK_NULL);
2203 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2204 }
2205 JVM_END
2206
2207 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2208 {
2209 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
2210 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2211 bounds_check(cp, index, CHECK_NULL);
2212 constantTag tag = cp->tag_at(index);
2213 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2214 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2215 }
2216 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2217 if (k == NULL) return NULL;
2218 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2219 }
2220 JVM_END
2221
2222 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2223 constantTag tag = cp->tag_at(index);
2224 if (!tag.is_method() && !tag.is_interface_method()) {
2225 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2226 }
2227 int klass_ref = cp->uncached_klass_ref_index_at(index);
2228 Klass* k_o;
2229 if (force_resolution) {
2230 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2231 } else {
2232 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2233 if (k_o == NULL) return NULL;
2234 }
2235 InstanceKlass* k = InstanceKlass::cast(k_o);
2236 Symbol* name = cp->uncached_name_ref_at(index);
2237 Symbol* sig = cp->uncached_signature_ref_at(index);
2238 methodHandle m (THREAD, k->find_method(name, sig));
2239 if (m.is_null()) {
2240 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2241 }
2242 oop method;
2243 if (!m->is_initializer() || m->is_static()) {
2244 method = Reflection::new_method(m, true, CHECK_NULL);
2245 } else {
2246 method = Reflection::new_constructor(m, CHECK_NULL);
2247 }
2248 return JNIHandles::make_local(THREAD, method);
2249 }
2250
2251 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2252 {
2253 JVMWrapper("JVM_ConstantPoolGetMethodAt");
2254 JvmtiVMObjectAllocEventCollector oam;
2255 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2256 bounds_check(cp, index, CHECK_NULL);
2257 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2258 return res;
2259 }
2260 JVM_END
2261
2262 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2263 {
2264 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
2265 JvmtiVMObjectAllocEventCollector oam;
2266 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2267 bounds_check(cp, index, CHECK_NULL);
2268 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2269 return res;
2270 }
2271 JVM_END
2272
2273 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2274 constantTag tag = cp->tag_at(index);
2275 if (!tag.is_field()) {
2276 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2277 }
2278 int klass_ref = cp->uncached_klass_ref_index_at(index);
2279 Klass* k_o;
2280 if (force_resolution) {
2281 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2282 } else {
2283 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2284 if (k_o == NULL) return NULL;
2285 }
2286 InstanceKlass* k = InstanceKlass::cast(k_o);
2287 Symbol* name = cp->uncached_name_ref_at(index);
2288 Symbol* sig = cp->uncached_signature_ref_at(index);
2289 fieldDescriptor fd;
2290 Klass* target_klass = k->find_field(name, sig, &fd);
2291 if (target_klass == NULL) {
2292 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2293 }
2294 oop field = Reflection::new_field(&fd, CHECK_NULL);
2295 return JNIHandles::make_local(THREAD, field);
2296 }
2297
2298 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2299 {
2300 JVMWrapper("JVM_ConstantPoolGetFieldAt");
2301 JvmtiVMObjectAllocEventCollector oam;
2302 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2303 bounds_check(cp, index, CHECK_NULL);
2304 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2305 return res;
2306 }
2307 JVM_END
2308
2309 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2310 {
2311 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
2312 JvmtiVMObjectAllocEventCollector oam;
2313 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2314 bounds_check(cp, index, CHECK_NULL);
2315 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2316 return res;
2317 }
2318 JVM_END
2319
2320 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2321 {
2322 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
2323 JvmtiVMObjectAllocEventCollector oam;
2324 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2325 bounds_check(cp, index, CHECK_NULL);
2326 constantTag tag = cp->tag_at(index);
2327 if (!tag.is_field_or_method()) {
2328 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2329 }
2330 int klass_ref = cp->uncached_klass_ref_index_at(index);
2331 Symbol* klass_name = cp->klass_name_at(klass_ref);
2332 Symbol* member_name = cp->uncached_name_ref_at(index);
2333 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2334 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
2335 objArrayHandle dest(THREAD, dest_o);
2336 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2337 dest->obj_at_put(0, str());
2338 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2339 dest->obj_at_put(1, str());
2340 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2341 dest->obj_at_put(2, str());
2342 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2343 }
2344 JVM_END
2345
2346 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2347 {
2348 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt");
2349 JvmtiVMObjectAllocEventCollector oam;
2350 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2351 bounds_check(cp, index, CHECK_0);
2352 constantTag tag = cp->tag_at(index);
2353 if (!tag.is_field_or_method()) {
2354 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2355 }
2356 return (jint) cp->uncached_klass_ref_index_at(index);
2357 }
2358 JVM_END
2359
2360 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2361 {
2362 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt");
2363 JvmtiVMObjectAllocEventCollector oam;
2364 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2365 bounds_check(cp, index, CHECK_0);
2366 constantTag tag = cp->tag_at(index);
2367 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2368 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2369 }
2370 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2371 }
2372 JVM_END
2373
2374 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2375 {
2376 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt");
2377 JvmtiVMObjectAllocEventCollector oam;
2378 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2379 bounds_check(cp, index, CHECK_NULL);
2380 constantTag tag = cp->tag_at(index);
2381 if (!tag.is_name_and_type()) {
2382 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2383 }
2384 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2385 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2386 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL);
2387 objArrayHandle dest(THREAD, dest_o);
2388 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2389 dest->obj_at_put(0, str());
2390 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2391 dest->obj_at_put(1, str());
2392 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2393 }
2394 JVM_END
2395
2396 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2397 {
2398 JVMWrapper("JVM_ConstantPoolGetIntAt");
2399 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2400 bounds_check(cp, index, CHECK_0);
2401 constantTag tag = cp->tag_at(index);
2402 if (!tag.is_int()) {
2403 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2404 }
2405 return cp->int_at(index);
2406 }
2407 JVM_END
2408
2409 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2410 {
2411 JVMWrapper("JVM_ConstantPoolGetLongAt");
2412 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2413 bounds_check(cp, index, CHECK_(0L));
2414 constantTag tag = cp->tag_at(index);
2415 if (!tag.is_long()) {
2416 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2417 }
2418 return cp->long_at(index);
2419 }
2420 JVM_END
2421
2422 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2423 {
2424 JVMWrapper("JVM_ConstantPoolGetFloatAt");
2425 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2426 bounds_check(cp, index, CHECK_(0.0f));
2427 constantTag tag = cp->tag_at(index);
2428 if (!tag.is_float()) {
2429 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2430 }
2431 return cp->float_at(index);
2432 }
2433 JVM_END
2434
2435 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2436 {
2437 JVMWrapper("JVM_ConstantPoolGetDoubleAt");
2438 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2439 bounds_check(cp, index, CHECK_(0.0));
2440 constantTag tag = cp->tag_at(index);
2441 if (!tag.is_double()) {
2442 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2443 }
2444 return cp->double_at(index);
2445 }
2446 JVM_END
2447
2448 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2449 {
2450 JVMWrapper("JVM_ConstantPoolGetStringAt");
2451 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2452 bounds_check(cp, index, CHECK_NULL);
2453 constantTag tag = cp->tag_at(index);
2454 if (!tag.is_string()) {
2455 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2456 }
2457 oop str = cp->string_at(index, CHECK_NULL);
2458 return (jstring) JNIHandles::make_local(THREAD, str);
2459 }
2460 JVM_END
2461
2462 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2463 {
2464 JVMWrapper("JVM_ConstantPoolGetUTF8At");
2465 JvmtiVMObjectAllocEventCollector oam;
2466 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2467 bounds_check(cp, index, CHECK_NULL);
2468 constantTag tag = cp->tag_at(index);
2469 if (!tag.is_symbol()) {
2470 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2471 }
2472 Symbol* sym = cp->symbol_at(index);
2473 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2474 return (jstring) JNIHandles::make_local(THREAD, str());
2475 }
2476 JVM_END
2477
2478 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2479 {
2480 JVMWrapper("JVM_ConstantPoolGetTagAt");
2481 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2482 bounds_check(cp, index, CHECK_0);
2483 constantTag tag = cp->tag_at(index);
2484 jbyte result = tag.value();
2485 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2486 // they are changed to the corresponding tags from the JVM spec, so that java code in
2487 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2488 if (tag.is_klass_or_reference()) {
2489 result = JVM_CONSTANT_Class;
2490 } else if (tag.is_string_index()) {
2491 result = JVM_CONSTANT_String;
2492 } else if (tag.is_method_type_in_error()) {
2493 result = JVM_CONSTANT_MethodType;
2494 } else if (tag.is_method_handle_in_error()) {
2495 result = JVM_CONSTANT_MethodHandle;
2496 } else if (tag.is_dynamic_constant_in_error()) {
2497 result = JVM_CONSTANT_Dynamic;
2498 }
2499 return result;
2500 }
2501 JVM_END
2502
2503 // Assertion support. //////////////////////////////////////////////////////////
2504
2505 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2506 JVMWrapper("JVM_DesiredAssertionStatus");
2507 assert(cls != NULL, "bad class");
2508
2509 oop r = JNIHandles::resolve(cls);
2510 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2511 if (java_lang_Class::is_primitive(r)) return false;
2512
2513 Klass* k = java_lang_Class::as_Klass(r);
2514 assert(k->is_instance_klass(), "must be an instance klass");
2515 if (!k->is_instance_klass()) return false;
2516
2517 ResourceMark rm(THREAD);
2518 const char* name = k->name()->as_C_string();
2519 bool system_class = k->class_loader() == NULL;
2520 return JavaAssertions::enabled(name, system_class);
2521
2522 JVM_END
2523
2524
2525 // Return a new AssertionStatusDirectives object with the fields filled in with
2526 // command-line assertion arguments (i.e., -ea, -da).
2527 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2528 JVMWrapper("JVM_AssertionStatusDirectives");
2529 JvmtiVMObjectAllocEventCollector oam;
2530 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2531 return JNIHandles::make_local(THREAD, asd);
2532 JVM_END
2533
2534 // Verification ////////////////////////////////////////////////////////////////////////////////
2535
2536 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2537
2538 // RedefineClasses support: bug 6214132 caused verification to fail.
2539 // All functions from this section should call the jvmtiThreadSate function:
2540 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2541 // The function returns a Klass* of the _scratch_class if the verifier
2542 // was invoked in the middle of the class redefinition.
2543 // Otherwise it returns its argument value which is the _the_class Klass*.
2544 // Please, refer to the description in the jvmtiThreadSate.hpp.
2545
2546 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2547 JVMWrapper("JVM_GetClassNameUTF");
2548 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2549 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2550 return k->name()->as_utf8();
2551 JVM_END
2552
2553
2554 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2555 JVMWrapper("JVM_GetClassCPTypes");
2556 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2557 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2558 // types will have length zero if this is not an InstanceKlass
2559 // (length is determined by call to JVM_GetClassCPEntriesCount)
2560 if (k->is_instance_klass()) {
2561 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2562 for (int index = cp->length() - 1; index >= 0; index--) {
2563 constantTag tag = cp->tag_at(index);
2564 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2565 }
2566 }
2567 JVM_END
2568
2569
2570 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2571 JVMWrapper("JVM_GetClassCPEntriesCount");
2572 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2573 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2574 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2575 JVM_END
2576
2577
2578 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2579 JVMWrapper("JVM_GetClassFieldsCount");
2580 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2581 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2582 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2583 JVM_END
2584
2585
2586 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2587 JVMWrapper("JVM_GetClassMethodsCount");
2588 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2589 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2590 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2591 JVM_END
2592
2593
2594 // The following methods, used for the verifier, are never called with
2595 // array klasses, so a direct cast to InstanceKlass is safe.
2596 // Typically, these methods are called in a loop with bounds determined
2597 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2598 // zero for arrays.
2599 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2600 JVMWrapper("JVM_GetMethodIxExceptionIndexes");
2601 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2602 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2603 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2604 int length = method->checked_exceptions_length();
2605 if (length > 0) {
2606 CheckedExceptionElement* table= method->checked_exceptions_start();
2607 for (int i = 0; i < length; i++) {
2608 exceptions[i] = table[i].class_cp_index;
2609 }
2610 }
2611 JVM_END
2612
2613
2614 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2615 JVMWrapper("JVM_GetMethodIxExceptionsCount");
2616 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2617 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2618 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2619 return method->checked_exceptions_length();
2620 JVM_END
2621
2622
2623 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2624 JVMWrapper("JVM_GetMethodIxByteCode");
2625 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2626 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2627 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2628 memcpy(code, method->code_base(), method->code_size());
2629 JVM_END
2630
2631
2632 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2633 JVMWrapper("JVM_GetMethodIxByteCodeLength");
2634 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2635 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2636 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2637 return method->code_size();
2638 JVM_END
2639
2640
2641 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2642 JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
2643 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2644 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2645 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2646 ExceptionTable extable(method);
2647 entry->start_pc = extable.start_pc(entry_index);
2648 entry->end_pc = extable.end_pc(entry_index);
2649 entry->handler_pc = extable.handler_pc(entry_index);
2650 entry->catchType = extable.catch_type_index(entry_index);
2651 JVM_END
2652
2653
2654 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2655 JVMWrapper("JVM_GetMethodIxExceptionTableLength");
2656 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2657 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2658 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2659 return method->exception_table_length();
2660 JVM_END
2661
2662
2663 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2664 JVMWrapper("JVM_GetMethodIxModifiers");
2665 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2666 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2667 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2668 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2669 JVM_END
2670
2671
2672 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2673 JVMWrapper("JVM_GetFieldIxModifiers");
2674 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2675 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2676 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2677 JVM_END
2678
2679
2680 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2681 JVMWrapper("JVM_GetMethodIxLocalsCount");
2682 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2683 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2684 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2685 return method->max_locals();
2686 JVM_END
2687
2688
2689 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2690 JVMWrapper("JVM_GetMethodIxArgsSize");
2691 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2692 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2693 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2694 return method->size_of_parameters();
2695 JVM_END
2696
2697
2698 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2699 JVMWrapper("JVM_GetMethodIxMaxStack");
2700 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2701 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2702 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2703 return method->verifier_max_stack();
2704 JVM_END
2705
2706
2707 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2708 JVMWrapper("JVM_IsConstructorIx");
2709 ResourceMark rm(THREAD);
2710 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2711 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2712 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2713 return method->name() == vmSymbols::object_initializer_name();
2714 JVM_END
2715
2716
2717 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2718 JVMWrapper("JVM_IsVMGeneratedMethodIx");
2719 ResourceMark rm(THREAD);
2720 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2721 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2722 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2723 return method->is_overpass();
2724 JVM_END
2725
2726 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2727 JVMWrapper("JVM_GetMethodIxIxUTF");
2728 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2729 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2730 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2731 return method->name()->as_utf8();
2732 JVM_END
2733
2734
2735 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2736 JVMWrapper("JVM_GetMethodIxSignatureUTF");
2737 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2738 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2739 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2740 return method->signature()->as_utf8();
2741 JVM_END
2742
2743 /**
2744 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2745 * read entries in the constant pool. Since the old verifier always
2746 * works on a copy of the code, it will not see any rewriting that
2747 * may possibly occur in the middle of verification. So it is important
2748 * that nothing it calls tries to use the cpCache instead of the raw
2749 * constant pool, so we must use cp->uncached_x methods when appropriate.
2750 */
2751 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2752 JVMWrapper("JVM_GetCPFieldNameUTF");
2753 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2754 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2755 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2756 switch (cp->tag_at(cp_index).value()) {
2757 case JVM_CONSTANT_Fieldref:
2758 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2759 default:
2760 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2761 }
2762 ShouldNotReachHere();
2763 return NULL;
2764 JVM_END
2765
2766
2767 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2768 JVMWrapper("JVM_GetCPMethodNameUTF");
2769 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2770 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2771 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2772 switch (cp->tag_at(cp_index).value()) {
2773 case JVM_CONSTANT_InterfaceMethodref:
2774 case JVM_CONSTANT_Methodref:
2775 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2776 default:
2777 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2778 }
2779 ShouldNotReachHere();
2780 return NULL;
2781 JVM_END
2782
2783
2784 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2785 JVMWrapper("JVM_GetCPMethodSignatureUTF");
2786 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2787 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2788 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2789 switch (cp->tag_at(cp_index).value()) {
2790 case JVM_CONSTANT_InterfaceMethodref:
2791 case JVM_CONSTANT_Methodref:
2792 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2793 default:
2794 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2795 }
2796 ShouldNotReachHere();
2797 return NULL;
2798 JVM_END
2799
2800
2801 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2802 JVMWrapper("JVM_GetCPFieldSignatureUTF");
2803 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2804 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2805 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2806 switch (cp->tag_at(cp_index).value()) {
2807 case JVM_CONSTANT_Fieldref:
2808 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2809 default:
2810 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2811 }
2812 ShouldNotReachHere();
2813 return NULL;
2814 JVM_END
2815
2816
2817 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2818 JVMWrapper("JVM_GetCPClassNameUTF");
2819 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2820 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2821 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2822 Symbol* classname = cp->klass_name_at(cp_index);
2823 return classname->as_utf8();
2824 JVM_END
2825
2826
2827 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2828 JVMWrapper("JVM_GetCPFieldClassNameUTF");
2829 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2830 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2831 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2832 switch (cp->tag_at(cp_index).value()) {
2833 case JVM_CONSTANT_Fieldref: {
2834 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2835 Symbol* classname = cp->klass_name_at(class_index);
2836 return classname->as_utf8();
2837 }
2838 default:
2839 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2840 }
2841 ShouldNotReachHere();
2842 return NULL;
2843 JVM_END
2844
2845
2846 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2847 JVMWrapper("JVM_GetCPMethodClassNameUTF");
2848 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2849 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2850 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2851 switch (cp->tag_at(cp_index).value()) {
2852 case JVM_CONSTANT_Methodref:
2853 case JVM_CONSTANT_InterfaceMethodref: {
2854 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2855 Symbol* classname = cp->klass_name_at(class_index);
2856 return classname->as_utf8();
2857 }
2858 default:
2859 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2860 }
2861 ShouldNotReachHere();
2862 return NULL;
2863 JVM_END
2864
2865
2866 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2867 JVMWrapper("JVM_GetCPFieldModifiers");
2868 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2869 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2870 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2871 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2872 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2873 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2874 switch (cp->tag_at(cp_index).value()) {
2875 case JVM_CONSTANT_Fieldref: {
2876 Symbol* name = cp->uncached_name_ref_at(cp_index);
2877 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2878 InstanceKlass* ik = InstanceKlass::cast(k_called);
2879 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2880 if (fs.name() == name && fs.signature() == signature) {
2881 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2882 }
2883 }
2884 return -1;
2885 }
2886 default:
2887 fatal("JVM_GetCPFieldModifiers: illegal constant");
2888 }
2889 ShouldNotReachHere();
2890 return 0;
2891 JVM_END
2892
2893
2894 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2895 JVMWrapper("JVM_GetCPMethodModifiers");
2896 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2897 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2898 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2899 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2900 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2901 switch (cp->tag_at(cp_index).value()) {
2902 case JVM_CONSTANT_Methodref:
2903 case JVM_CONSTANT_InterfaceMethodref: {
2904 Symbol* name = cp->uncached_name_ref_at(cp_index);
2905 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2906 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2907 int methods_count = methods->length();
2908 for (int i = 0; i < methods_count; i++) {
2909 Method* method = methods->at(i);
2910 if (method->name() == name && method->signature() == signature) {
2911 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2912 }
2913 }
2914 return -1;
2915 }
2916 default:
2917 fatal("JVM_GetCPMethodModifiers: illegal constant");
2918 }
2919 ShouldNotReachHere();
2920 return 0;
2921 JVM_END
2922
2923
2924 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2925
2926 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2927 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2928 JVM_END
2929
2930
2931 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2932 JVMWrapper("JVM_IsSameClassPackage");
2933 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2934 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2935 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2936 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2937 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2938 JVM_END
2939
2940 // Printing support //////////////////////////////////////////////////
2941 extern "C" {
2942
2943 ATTRIBUTE_PRINTF(3, 0)
2944 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2945 // Reject count values that are negative signed values converted to
2946 // unsigned; see bug 4399518, 4417214
2947 if ((intptr_t)count <= 0) return -1;
2948
2949 int result = os::vsnprintf(str, count, fmt, args);
2950 if (result > 0 && (size_t)result >= count) {
2951 result = -1;
2952 }
2953
2954 return result;
2955 }
2956
2957 ATTRIBUTE_PRINTF(3, 4)
2958 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2959 va_list args;
2960 int len;
2961 va_start(args, fmt);
2962 len = jio_vsnprintf(str, count, fmt, args);
2963 va_end(args);
2964 return len;
2965 }
2966
2967 ATTRIBUTE_PRINTF(2, 3)
2968 int jio_fprintf(FILE* f, const char *fmt, ...) {
2969 int len;
2970 va_list args;
2971 va_start(args, fmt);
2972 len = jio_vfprintf(f, fmt, args);
2973 va_end(args);
2974 return len;
2975 }
2976
2977 ATTRIBUTE_PRINTF(2, 0)
2978 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2979 if (Arguments::vfprintf_hook() != NULL) {
2980 return Arguments::vfprintf_hook()(f, fmt, args);
2981 } else {
2982 return vfprintf(f, fmt, args);
2983 }
2984 }
2985
2986 ATTRIBUTE_PRINTF(1, 2)
2987 JNIEXPORT int jio_printf(const char *fmt, ...) {
2988 int len;
2989 va_list args;
2990 va_start(args, fmt);
2991 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2992 va_end(args);
2993 return len;
2994 }
2995
2996 // HotSpot specific jio method
2997 void jio_print(const char* s, size_t len) {
2998 // Try to make this function as atomic as possible.
2999 if (Arguments::vfprintf_hook() != NULL) {
3000 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
3001 } else {
3002 // Make an unused local variable to avoid warning from gcc compiler.
3003 size_t count = ::write(defaultStream::output_fd(), s, (int)len);
3004 }
3005 }
3006
3007 } // Extern C
3008
3009 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
3010
3011 // In most of the JVM thread support functions we need to access the
3012 // thread through a ThreadsListHandle to prevent it from exiting and
3013 // being reclaimed while we try to operate on it. The exceptions to this
3014 // rule are when operating on the current thread, or if the monitor of
3015 // the target java.lang.Thread is locked at the Java level - in both
3016 // cases the target cannot exit.
3017
3018 static void thread_entry(JavaThread* thread, TRAPS) {
3019 HandleMark hm(THREAD);
3020 Handle obj(THREAD, thread->threadObj());
3021 JavaValue result(T_VOID);
3022 JavaCalls::call_virtual(&result,
3023 obj,
3024 SystemDictionary::Thread_klass(),
3025 vmSymbols::run_method_name(),
3026 vmSymbols::void_method_signature(),
3027 THREAD);
3028 }
3029
3030
3031 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
3032 JVMWrapper("JVM_StartThread");
3033 JavaThread *native_thread = NULL;
3034
3035 // We cannot hold the Threads_lock when we throw an exception,
3036 // due to rank ordering issues. Example: we might need to grab the
3037 // Heap_lock while we construct the exception.
3038 bool throw_illegal_thread_state = false;
3039
3040 // We must release the Threads_lock before we can post a jvmti event
3041 // in Thread::start.
3042 {
3043 // Ensure that the C++ Thread and OSThread structures aren't freed before
3044 // we operate.
3045 MutexLocker mu(Threads_lock);
3046
3047 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
3048 // re-starting an already started thread, so we should usually find
3049 // that the JavaThread is null. However for a JNI attached thread
3050 // there is a small window between the Thread object being created
3051 // (with its JavaThread set) and the update to its threadStatus, so we
3052 // have to check for this
3053 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
3054 throw_illegal_thread_state = true;
3055 } else {
3056 // We could also check the stillborn flag to see if this thread was already stopped, but
3057 // for historical reasons we let the thread detect that itself when it starts running
3058
3059 jlong size =
3060 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
3061 // Allocate the C++ Thread structure and create the native thread. The
3062 // stack size retrieved from java is 64-bit signed, but the constructor takes
3063 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
3064 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
3065 // - Avoid passing negative values which would result in really large stacks.
3066 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
3067 size_t sz = size > 0 ? (size_t) size : 0;
3068 native_thread = new JavaThread(&thread_entry, sz);
3069
3070 // At this point it may be possible that no osthread was created for the
3071 // JavaThread due to lack of memory. Check for this situation and throw
3072 // an exception if necessary. Eventually we may want to change this so
3073 // that we only grab the lock if the thread was created successfully -
3074 // then we can also do this check and throw the exception in the
3075 // JavaThread constructor.
3076 if (native_thread->osthread() != NULL) {
3077 // Note: the current thread is not being used within "prepare".
3078 native_thread->prepare(jthread);
3079 }
3080 }
3081 }
3082
3083 if (throw_illegal_thread_state) {
3084 THROW(vmSymbols::java_lang_IllegalThreadStateException());
3085 }
3086
3087 assert(native_thread != NULL, "Starting null thread?");
3088
3089 if (native_thread->osthread() == NULL) {
3090 // No one should hold a reference to the 'native_thread'.
3091 native_thread->smr_delete();
3092 if (JvmtiExport::should_post_resource_exhausted()) {
3093 JvmtiExport::post_resource_exhausted(
3094 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
3095 os::native_thread_creation_failed_msg());
3096 }
3097 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
3098 os::native_thread_creation_failed_msg());
3099 }
3100
3101 #if INCLUDE_JFR
3102 if (Jfr::is_recording() && EventThreadStart::is_enabled() &&
3103 EventThreadStart::is_stacktrace_enabled()) {
3104 JfrThreadLocal* tl = native_thread->jfr_thread_local();
3105 // skip Thread.start() and Thread.start0()
3106 tl->set_cached_stack_trace_id(JfrStackTraceRepository::record(thread, 2));
3107 }
3108 #endif
3109
3110 Thread::start(native_thread);
3111
3112 JVM_END
3113
3114
3115 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
3116 // before the quasi-asynchronous exception is delivered. This is a little obtrusive,
3117 // but is thought to be reliable and simple. In the case, where the receiver is the
3118 // same thread as the sender, no VM_Operation is needed.
3119 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
3120 JVMWrapper("JVM_StopThread");
3121
3122 // A nested ThreadsListHandle will grab the Threads_lock so create
3123 // tlh before we resolve throwable.
3124 ThreadsListHandle tlh(thread);
3125 oop java_throwable = JNIHandles::resolve(throwable);
3126 if (java_throwable == NULL) {
3127 THROW(vmSymbols::java_lang_NullPointerException());
3128 }
3129 oop java_thread = NULL;
3130 JavaThread* receiver = NULL;
3131 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3132 Events::log_exception(thread,
3133 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
3134 p2i(receiver), p2i(java_thread), p2i(throwable));
3135
3136 if (is_alive) {
3137 // jthread refers to a live JavaThread.
3138 if (thread == receiver) {
3139 // Exception is getting thrown at self so no VM_Operation needed.
3140 THROW_OOP(java_throwable);
3141 } else {
3142 // Use a VM_Operation to throw the exception.
3143 Thread::send_async_exception(java_thread, java_throwable);
3144 }
3145 } else {
3146 // Either:
3147 // - target thread has not been started before being stopped, or
3148 // - target thread already terminated
3149 // We could read the threadStatus to determine which case it is
3150 // but that is overkill as it doesn't matter. We must set the
3151 // stillborn flag for the first case, and if the thread has already
3152 // exited setting this flag has no effect.
3153 java_lang_Thread::set_stillborn(java_thread);
3154 }
3155 JVM_END
3156
3157
3158 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
3159 JVMWrapper("JVM_IsThreadAlive");
3160
3161 oop thread_oop = JNIHandles::resolve_non_null(jthread);
3162 return java_lang_Thread::is_alive(thread_oop);
3163 JVM_END
3164
3165
3166 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
3167 JVMWrapper("JVM_SuspendThread");
3168
3169 ThreadsListHandle tlh(thread);
3170 JavaThread* receiver = NULL;
3171 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3172 if (is_alive) {
3173 // jthread refers to a live JavaThread.
3174 {
3175 MutexLocker ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
3176 if (receiver->is_external_suspend()) {
3177 // Don't allow nested external suspend requests. We can't return
3178 // an error from this interface so just ignore the problem.
3179 return;
3180 }
3181 if (receiver->is_exiting()) { // thread is in the process of exiting
3182 return;
3183 }
3184 receiver->set_external_suspend();
3185 }
3186
3187 // java_suspend() will catch threads in the process of exiting
3188 // and will ignore them.
3189 receiver->java_suspend();
3190
3191 // It would be nice to have the following assertion in all the
3192 // time, but it is possible for a racing resume request to have
3193 // resumed this thread right after we suspended it. Temporarily
3194 // enable this assertion if you are chasing a different kind of
3195 // bug.
3196 //
3197 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
3198 // receiver->is_being_ext_suspended(), "thread is not suspended");
3199 }
3200 JVM_END
3201
3202
3203 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
3204 JVMWrapper("JVM_ResumeThread");
3205
3206 ThreadsListHandle tlh(thread);
3207 JavaThread* receiver = NULL;
3208 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3209 if (is_alive) {
3210 // jthread refers to a live JavaThread.
3211
3212 // This is the original comment for this Threads_lock grab:
3213 // We need to *always* get the threads lock here, since this operation cannot be allowed during
3214 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
3215 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code
3216 // looks at it.
3217 //
3218 // The above comment dates back to when we had both internal and
3219 // external suspend APIs that shared a common underlying mechanism.
3220 // External suspend is now entirely cooperative and doesn't share
3221 // anything with internal suspend. That said, there are some
3222 // assumptions in the VM that an external resume grabs the
3223 // Threads_lock. We can't drop the Threads_lock grab here until we
3224 // resolve the assumptions that exist elsewhere.
3225 //
3226 MutexLocker ml(Threads_lock);
3227 receiver->java_resume();
3228 }
3229 JVM_END
3230
3231
3232 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
3233 JVMWrapper("JVM_SetThreadPriority");
3234
3235 ThreadsListHandle tlh(thread);
3236 oop java_thread = NULL;
3237 JavaThread* receiver = NULL;
3238 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3239 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3240
3241 if (is_alive) {
3242 // jthread refers to a live JavaThread.
3243 Thread::set_priority(receiver, (ThreadPriority)prio);
3244 }
3245 // Implied else: If the JavaThread hasn't started yet, then the
3246 // priority set in the java.lang.Thread object above will be pushed
3247 // down when it does start.
3248 JVM_END
3249
3250
3251 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3252 JVMWrapper("JVM_Yield");
3253 if (os::dont_yield()) return;
3254 HOTSPOT_THREAD_YIELD();
3255 os::naked_yield();
3256 JVM_END
3257
3258 static void post_thread_sleep_event(EventThreadSleep* event, jlong millis) {
3259 assert(event != NULL, "invariant");
3260 assert(event->should_commit(), "invariant");
3261 event->set_time(millis);
3262 event->commit();
3263 }
3264
3265 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
3266 JVMWrapper("JVM_Sleep");
3267
3268 if (millis < 0) {
3269 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
3270 }
3271
3272 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
3273 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3274 }
3275
3276 // Save current thread state and restore it at the end of this block.
3277 // And set new thread state to SLEEPING.
3278 JavaThreadSleepState jtss(thread);
3279
3280 HOTSPOT_THREAD_SLEEP_BEGIN(millis);
3281 EventThreadSleep event;
3282
3283 if (millis == 0) {
3284 os::naked_yield();
3285 } else {
3286 ThreadState old_state = thread->osthread()->get_state();
3287 thread->osthread()->set_state(SLEEPING);
3288 if (!thread->sleep(millis)) { // interrupted
3289 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
3290 // us while we were sleeping. We do not overwrite those.
3291 if (!HAS_PENDING_EXCEPTION) {
3292 if (event.should_commit()) {
3293 post_thread_sleep_event(&event, millis);
3294 }
3295 HOTSPOT_THREAD_SLEEP_END(1);
3296
3297 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3298 // to properly restore the thread state. That's likely wrong.
3299 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3300 }
3301 }
3302 thread->osthread()->set_state(old_state);
3303 }
3304 if (event.should_commit()) {
3305 post_thread_sleep_event(&event, millis);
3306 }
3307 HOTSPOT_THREAD_SLEEP_END(0);
3308 JVM_END
3309
3310 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3311 JVMWrapper("JVM_CurrentThread");
3312 oop jthread = thread->threadObj();
3313 assert(jthread != NULL, "no current thread!");
3314 return JNIHandles::make_local(THREAD, jthread);
3315 JVM_END
3316
3317 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3318 JVMWrapper("JVM_Interrupt");
3319
3320 ThreadsListHandle tlh(thread);
3321 JavaThread* receiver = NULL;
3322 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3323 if (is_alive) {
3324 // jthread refers to a live JavaThread.
3325 receiver->interrupt();
3326 }
3327 JVM_END
3328
3329
3330 // Return true iff the current thread has locked the object passed in
3331
3332 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3333 JVMWrapper("JVM_HoldsLock");
3334 assert(THREAD->is_Java_thread(), "sanity check");
3335 if (obj == NULL) {
3336 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3337 }
3338 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3339 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
3340 JVM_END
3341
3342
3343 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3344 JVMWrapper("JVM_DumpAllStacks");
3345 VM_PrintThreads op;
3346 VMThread::execute(&op);
3347 if (JvmtiExport::should_post_data_dump()) {
3348 JvmtiExport::post_data_dump();
3349 }
3350 JVM_END
3351
3352 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3353 JVMWrapper("JVM_SetNativeThreadName");
3354
3355 // We don't use a ThreadsListHandle here because the current thread
3356 // must be alive.
3357 oop java_thread = JNIHandles::resolve_non_null(jthread);
3358 JavaThread* thr = java_lang_Thread::thread(java_thread);
3359 if (thread == thr && !thr->has_attached_via_jni()) {
3360 // Thread naming is only supported for the current thread and
3361 // we don't set the name of an attached thread to avoid stepping
3362 // on other programs.
3363 ResourceMark rm(thread);
3364 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3365 os::set_native_thread_name(thread_name);
3366 }
3367 JVM_END
3368
3369 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3370
3371 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3372 JVMWrapper("JVM_GetClassContext");
3373 ResourceMark rm(THREAD);
3374 JvmtiVMObjectAllocEventCollector oam;
3375 vframeStream vfst(thread);
3376
3377 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
3378 // This must only be called from SecurityManager.getClassContext
3379 Method* m = vfst.method();
3380 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
3381 m->name() == vmSymbols::getClassContext_name() &&
3382 m->signature() == vmSymbols::void_class_array_signature())) {
3383 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3384 }
3385 }
3386
3387 // Collect method holders
3388 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3389 for (; !vfst.at_end(); vfst.security_next()) {
3390 Method* m = vfst.method();
3391 // Native frames are not returned
3392 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3393 Klass* holder = m->method_holder();
3394 assert(holder->is_klass(), "just checking");
3395 klass_array->append(holder);
3396 }
3397 }
3398
3399 // Create result array of type [Ljava/lang/Class;
3400 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
3401 // Fill in mirrors corresponding to method holders
3402 for (int i = 0; i < klass_array->length(); i++) {
3403 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3404 }
3405
3406 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3407 JVM_END
3408
3409
3410 // java.lang.Package ////////////////////////////////////////////////////////////////
3411
3412
3413 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3414 JVMWrapper("JVM_GetSystemPackage");
3415 ResourceMark rm(THREAD);
3416 JvmtiVMObjectAllocEventCollector oam;
3417 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3418 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3419 return (jstring) JNIHandles::make_local(THREAD, result);
3420 JVM_END
3421
3422
3423 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3424 JVMWrapper("JVM_GetSystemPackages");
3425 JvmtiVMObjectAllocEventCollector oam;
3426 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3427 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3428 JVM_END
3429
3430
3431 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3432
3433
3434 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3435 JVMWrapper("JVM_GetAndClearReferencePendingList");
3436
3437 MonitorLocker ml(Heap_lock);
3438 oop ref = Universe::reference_pending_list();
3439 if (ref != NULL) {
3440 Universe::clear_reference_pending_list();
3441 }
3442 return JNIHandles::make_local(THREAD, ref);
3443 JVM_END
3444
3445 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3446 JVMWrapper("JVM_HasReferencePendingList");
3447 MonitorLocker ml(Heap_lock);
3448 return Universe::has_reference_pending_list();
3449 JVM_END
3450
3451 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3452 JVMWrapper("JVM_WaitForReferencePendingList");
3453 MonitorLocker ml(Heap_lock);
3454 while (!Universe::has_reference_pending_list()) {
3455 ml.wait();
3456 }
3457 JVM_END
3458
3459
3460 // ObjectInputStream ///////////////////////////////////////////////////////////////
3461
3462 // Return the first user-defined class loader up the execution stack, or null
3463 // if only code from the bootstrap or platform class loader is on the stack.
3464
3465 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3466 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3467 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
3468 oop loader = vfst.method()->method_holder()->class_loader();
3469 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) {
3470 return JNIHandles::make_local(THREAD, loader);
3471 }
3472 }
3473 return NULL;
3474 JVM_END
3475
3476
3477 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3478
3479
3480 // resolve array handle and check arguments
3481 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3482 if (arr == NULL) {
3483 THROW_0(vmSymbols::java_lang_NullPointerException());
3484 }
3485 oop a = JNIHandles::resolve_non_null(arr);
3486 if (!a->is_array()) {
3487 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3488 } else if (type_array_only && !a->is_typeArray()) {
3489 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3490 }
3491 return arrayOop(a);
3492 }
3493
3494
3495 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3496 JVMWrapper("JVM_GetArrayLength");
3497 arrayOop a = check_array(env, arr, false, CHECK_0);
3498 return a->length();
3499 JVM_END
3500
3501
3502 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3503 JVMWrapper("JVM_Array_Get");
3504 JvmtiVMObjectAllocEventCollector oam;
3505 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3506 jvalue value;
3507 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3508 oop box = Reflection::box(&value, type, CHECK_NULL);
3509 return JNIHandles::make_local(THREAD, box);
3510 JVM_END
3511
3512
3513 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3514 JVMWrapper("JVM_GetPrimitiveArrayElement");
3515 jvalue value;
3516 value.i = 0; // to initialize value before getting used in CHECK
3517 arrayOop a = check_array(env, arr, true, CHECK_(value));
3518 assert(a->is_typeArray(), "just checking");
3519 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3520 BasicType wide_type = (BasicType) wCode;
3521 if (type != wide_type) {
3522 Reflection::widen(&value, type, wide_type, CHECK_(value));
3523 }
3524 return value;
3525 JVM_END
3526
3527
3528 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3529 JVMWrapper("JVM_SetArrayElement");
3530 arrayOop a = check_array(env, arr, false, CHECK);
3531 oop box = JNIHandles::resolve(val);
3532 jvalue value;
3533 value.i = 0; // to initialize value before getting used in CHECK
3534 BasicType value_type;
3535 if (a->is_objArray()) {
3536 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3537 value_type = Reflection::unbox_for_regular_object(box, &value);
3538 } else {
3539 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3540 }
3541 Reflection::array_set(&value, a, index, value_type, CHECK);
3542 JVM_END
3543
3544
3545 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3546 JVMWrapper("JVM_SetPrimitiveArrayElement");
3547 arrayOop a = check_array(env, arr, true, CHECK);
3548 assert(a->is_typeArray(), "just checking");
3549 BasicType value_type = (BasicType) vCode;
3550 Reflection::array_set(&v, a, index, value_type, CHECK);
3551 JVM_END
3552
3553
3554 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3555 JVMWrapper("JVM_NewArray");
3556 JvmtiVMObjectAllocEventCollector oam;
3557 oop element_mirror = JNIHandles::resolve(eltClass);
3558 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3559 return JNIHandles::make_local(THREAD, result);
3560 JVM_END
3561
3562
3563 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3564 JVMWrapper("JVM_NewMultiArray");
3565 JvmtiVMObjectAllocEventCollector oam;
3566 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3567 oop element_mirror = JNIHandles::resolve(eltClass);
3568 assert(dim_array->is_typeArray(), "just checking");
3569 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3570 return JNIHandles::make_local(THREAD, result);
3571 JVM_END
3572
3573
3574 // Library support ///////////////////////////////////////////////////////////////////////////
3575
3576 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
3577 //%note jvm_ct
3578 JVMWrapper("JVM_LoadLibrary");
3579 char ebuf[1024];
3580 void *load_result;
3581 {
3582 ThreadToNativeFromVM ttnfvm(thread);
3583 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3584 }
3585 if (load_result == NULL) {
3586 char msg[1024];
3587 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3588 // Since 'ebuf' may contain a string encoded using
3589 // platform encoding scheme, we need to pass
3590 // Exceptions::unsafe_to_utf8 to the new_exception method
3591 // as the last argument. See bug 6367357.
3592 Handle h_exception =
3593 Exceptions::new_exception(thread,
3594 vmSymbols::java_lang_UnsatisfiedLinkError(),
3595 msg, Exceptions::unsafe_to_utf8);
3596
3597 THROW_HANDLE_0(h_exception);
3598 }
3599 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3600 return load_result;
3601 JVM_END
3602
3603
3604 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3605 JVMWrapper("JVM_UnloadLibrary");
3606 os::dll_unload(handle);
3607 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3608 JVM_END
3609
3610
3611 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3612 JVMWrapper("JVM_FindLibraryEntry");
3613 void* find_result = os::dll_lookup(handle, name);
3614 log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3615 find_result != NULL ? "Found" : "Failed to find",
3616 name, p2i(handle));
3617 return find_result;
3618 JVM_END
3619
3620
3621 // JNI version ///////////////////////////////////////////////////////////////////////////////
3622
3623 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3624 JVMWrapper("JVM_IsSupportedJNIVersion");
3625 return Threads::is_supported_jni_version_including_1_1(version);
3626 JVM_END
3627
3628
3629 // String support ///////////////////////////////////////////////////////////////////////////
3630
3631 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3632 JVMWrapper("JVM_InternString");
3633 JvmtiVMObjectAllocEventCollector oam;
3634 if (str == NULL) return NULL;
3635 oop string = JNIHandles::resolve_non_null(str);
3636 oop result = StringTable::intern(string, CHECK_NULL);
3637 return (jstring) JNIHandles::make_local(THREAD, result);
3638 JVM_END
3639
3640
3641 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3642
3643 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3644 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3645 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3646 // in the safepoint protocol, thread suspension, thread interruption, or anything of that
3647 // nature. JavaThreads will be "in native" when using this API from JDK code.
3648
3649
3650 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3651 VM_Exit::block_if_vm_exited();
3652 JVMWrapper("JVM_RawMonitorCreate");
3653 return new os::PlatformMutex();
3654 }
3655
3656
3657 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3658 VM_Exit::block_if_vm_exited();
3659 JVMWrapper("JVM_RawMonitorDestroy");
3660 delete ((os::PlatformMutex*) mon);
3661 }
3662
3663
3664 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3665 VM_Exit::block_if_vm_exited();
3666 JVMWrapper("JVM_RawMonitorEnter");
3667 ((os::PlatformMutex*) mon)->lock();
3668 return 0;
3669 }
3670
3671
3672 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3673 VM_Exit::block_if_vm_exited();
3674 JVMWrapper("JVM_RawMonitorExit");
3675 ((os::PlatformMutex*) mon)->unlock();
3676 }
3677
3678
3679 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3680
3681 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3682 Handle loader, Handle protection_domain,
3683 jboolean throwError, TRAPS) {
3684 // Security Note:
3685 // The Java level wrapper will perform the necessary security check allowing
3686 // us to pass the NULL as the initiating class loader. The VM is responsible for
3687 // the checkPackageAccess relative to the initiating class loader via the
3688 // protection_domain. The protection_domain is passed as NULL by the java code
3689 // if there is no security manager in 3-arg Class.forName().
3690 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3691
3692 // Check if we should initialize the class
3693 if (init && klass->is_instance_klass()) {
3694 klass->initialize(CHECK_NULL);
3695 }
3696 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror());
3697 }
3698
3699
3700 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3701
3702 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3703 JVMWrapper("JVM_InvokeMethod");
3704 Handle method_handle;
3705 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3706 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3707 Handle receiver(THREAD, JNIHandles::resolve(obj));
3708 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3709 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3710 jobject res = JNIHandles::make_local(THREAD, result);
3711 if (JvmtiExport::should_post_vm_object_alloc()) {
3712 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3713 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3714 if (java_lang_Class::is_primitive(ret_type)) {
3715 // Only for primitive type vm allocates memory for java object.
3716 // See box() method.
3717 JvmtiExport::post_vm_object_alloc(thread, result);
3718 }
3719 }
3720 return res;
3721 } else {
3722 THROW_0(vmSymbols::java_lang_StackOverflowError());
3723 }
3724 JVM_END
3725
3726
3727 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3728 JVMWrapper("JVM_NewInstanceFromConstructor");
3729 oop constructor_mirror = JNIHandles::resolve(c);
3730 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3731 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3732 jobject res = JNIHandles::make_local(THREAD, result);
3733 if (JvmtiExport::should_post_vm_object_alloc()) {
3734 JvmtiExport::post_vm_object_alloc(thread, result);
3735 }
3736 return res;
3737 JVM_END
3738
3739 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3740
3741 JVM_LEAF(jboolean, JVM_SupportsCX8())
3742 JVMWrapper("JVM_SupportsCX8");
3743 return VM_Version::supports_cx8();
3744 JVM_END
3745
3746 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3747 JVMWrapper("JVM_InitializeFromArchive");
3748 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3749 assert(k->is_klass(), "just checking");
3750 HeapShared::initialize_from_archived_subgraph(k);
3751 JVM_END
3752
3753 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3754 jclass caller,
3755 jstring invokedName,
3756 jobject invokedType,
3757 jobject methodType,
3758 jobject implMethodMember,
3759 jobject instantiatedMethodType,
3760 jclass lambdaProxyClass))
3761 JVMWrapper("JVM_RegisterLambdaProxyClassForArchiving");
3762 #if INCLUDE_CDS
3763 if (!DynamicDumpSharedSpaces) {
3764 return;
3765 }
3766
3767 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3768 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3769 if (caller_ik->is_hidden() || caller_ik->is_unsafe_anonymous()) {
3770 // VM anonymous classes and hidden classes not of type lambda proxy classes are currently not being archived.
3771 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3772 // registered for archiving.
3773 return;
3774 }
3775 Klass* lambda_k = java_lang_Class::as_Klass(JNIHandles::resolve(lambdaProxyClass));
3776 InstanceKlass* lambda_ik = InstanceKlass::cast(lambda_k);
3777 assert(lambda_ik->is_hidden(), "must be a hidden class");
3778 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3779
3780 Symbol* invoked_name = NULL;
3781 if (invokedName != NULL) {
3782 invoked_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(invokedName));
3783 }
3784 Handle invoked_type_oop(THREAD, JNIHandles::resolve_non_null(invokedType));
3785 Symbol* invoked_type = java_lang_invoke_MethodType::as_signature(invoked_type_oop(), true);
3786
3787 Handle method_type_oop(THREAD, JNIHandles::resolve_non_null(methodType));
3788 Symbol* method_type = java_lang_invoke_MethodType::as_signature(method_type_oop(), true);
3789
3790 Handle impl_method_member_oop(THREAD, JNIHandles::resolve_non_null(implMethodMember));
3791 assert(java_lang_invoke_MemberName::is_method(impl_method_member_oop()), "must be");
3792 Method* m = java_lang_invoke_MemberName::vmtarget(impl_method_member_oop());
3793
3794 Handle instantiated_method_type_oop(THREAD, JNIHandles::resolve_non_null(instantiatedMethodType));
3795 Symbol* instantiated_method_type = java_lang_invoke_MethodType::as_signature(instantiated_method_type_oop(), true);
3796
3797 SystemDictionaryShared::add_lambda_proxy_class(caller_ik, lambda_ik, invoked_name, invoked_type,
3798 method_type, m, instantiated_method_type);
3799 #endif // INCLUDE_CDS
3800 JVM_END
3801
3802 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3803 jclass caller,
3804 jstring invokedName,
3805 jobject invokedType,
3806 jobject methodType,
3807 jobject implMethodMember,
3808 jobject instantiatedMethodType,
3809 jboolean initialize))
3810 JVMWrapper("JVM_LookupLambdaProxyClassFromArchive");
3811 #if INCLUDE_CDS
3812 if (!DynamicArchive::is_mapped()) {
3813 return NULL;
3814 }
3815
3816 if (invokedName == NULL || invokedType == NULL || methodType == NULL ||
3817 implMethodMember == NULL || instantiatedMethodType == NULL) {
3818 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
3819 }
3820
3821 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3822 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3823 if (!caller_ik->is_shared()) {
3824 // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3825 return NULL;
3826 }
3827
3828 Symbol* invoked_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(invokedName));
3829 Handle invoked_type_oop(THREAD, JNIHandles::resolve_non_null(invokedType));
3830 Symbol* invoked_type = java_lang_invoke_MethodType::as_signature(invoked_type_oop(), true);
3831
3832 Handle method_type_oop(THREAD, JNIHandles::resolve_non_null(methodType));
3833 Symbol* method_type = java_lang_invoke_MethodType::as_signature(method_type_oop(), true);
3834
3835 Handle impl_method_member_oop(THREAD, JNIHandles::resolve_non_null(implMethodMember));
3836 assert(java_lang_invoke_MemberName::is_method(impl_method_member_oop()), "must be");
3837 Method* m = java_lang_invoke_MemberName::vmtarget(impl_method_member_oop());
3838
3839 Handle instantiated_method_type_oop(THREAD, JNIHandles::resolve_non_null(instantiatedMethodType));
3840 Symbol* instantiated_method_type = java_lang_invoke_MethodType::as_signature(instantiated_method_type_oop(), true);
3841
3842 InstanceKlass* lambda_ik = SystemDictionaryShared::get_shared_lambda_proxy_class(caller_ik, invoked_name, invoked_type,
3843 method_type, m, instantiated_method_type);
3844 jclass jcls = NULL;
3845 if (lambda_ik != NULL) {
3846 InstanceKlass* loaded_lambda = SystemDictionaryShared::prepare_shared_lambda_proxy_class(lambda_ik, caller_ik, initialize, THREAD);
3847 jcls = loaded_lambda == NULL ? NULL : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror());
3848 }
3849 return jcls;
3850 #else
3851 return NULL;
3852 #endif // INCLUDE_CDS
3853 JVM_END
3854
3855 JVM_ENTRY(jboolean, JVM_IsCDSDumpingEnabled(JNIEnv* env))
3856 JVMWrapper("JVM_IsCDSDumpingEnable");
3857 return DynamicDumpSharedSpaces;
3858 JVM_END
3859
3860 JVM_ENTRY(jboolean, JVM_IsCDSSharingEnabled(JNIEnv* env))
3861 JVMWrapper("JVM_IsCDSSharingEnable");
3862 return UseSharedSpaces;
3863 JVM_END
3864
3865 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForCDSDump())
3866 JVMWrapper("JVM_GetRandomSeedForCDSDump");
3867 if (DumpSharedSpaces) {
3868 const char* release = Abstract_VM_Version::vm_release();
3869 const char* dbg_level = Abstract_VM_Version::jdk_debug_level();
3870 const char* version = VM_Version::internal_vm_info_string();
3871 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3872 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3873 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3874 seed += (jlong)Abstract_VM_Version::vm_major_version();
3875 seed += (jlong)Abstract_VM_Version::vm_minor_version();
3876 seed += (jlong)Abstract_VM_Version::vm_security_version();
3877 seed += (jlong)Abstract_VM_Version::vm_patch_version();
3878 if (seed == 0) { // don't let this ever be zero.
3879 seed = 0x87654321;
3880 }
3881 log_debug(cds)("JVM_GetRandomSeedForCDSDump() = " JLONG_FORMAT, seed);
3882 return seed;
3883 } else {
3884 return 0;
3885 }
3886 JVM_END
3887
3888 // Returns an array of all live Thread objects (VM internal JavaThreads,
3889 // jvmti agent threads, and JNI attaching threads are skipped)
3890 // See CR 6404306 regarding JNI attaching threads
3891 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3892 ResourceMark rm(THREAD);
3893 ThreadsListEnumerator tle(THREAD, false, false);
3894 JvmtiVMObjectAllocEventCollector oam;
3895
3896 int num_threads = tle.num_threads();
3897 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
3898 objArrayHandle threads_ah(THREAD, r);
3899
3900 for (int i = 0; i < num_threads; i++) {
3901 Handle h = tle.get_threadObj(i);
3902 threads_ah->obj_at_put(i, h());
3903 }
3904
3905 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah());
3906 JVM_END
3907
3908
3909 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3910 // Return StackTraceElement[][], each element is the stack trace of a thread in
3911 // the corresponding entry in the given threads array
3912 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3913 JVMWrapper("JVM_DumpThreads");
3914 JvmtiVMObjectAllocEventCollector oam;
3915
3916 // Check if threads is null
3917 if (threads == NULL) {
3918 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3919 }
3920
3921 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3922 objArrayHandle ah(THREAD, a);
3923 int num_threads = ah->length();
3924 // check if threads is non-empty array
3925 if (num_threads == 0) {
3926 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3927 }
3928
3929 // check if threads is not an array of objects of Thread class
3930 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3931 if (k != SystemDictionary::Thread_klass()) {
3932 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3933 }
3934
3935 ResourceMark rm(THREAD);
3936
3937 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3938 for (int i = 0; i < num_threads; i++) {
3939 oop thread_obj = ah->obj_at(i);
3940 instanceHandle h(THREAD, (instanceOop) thread_obj);
3941 thread_handle_array->append(h);
3942 }
3943
3944 // The JavaThread references in thread_handle_array are validated
3945 // in VM_ThreadDump::doit().
3946 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3947 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces());
3948
3949 JVM_END
3950
3951 // JVM monitoring and management support
3952 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
3953 return Management::get_jmm_interface(version);
3954 JVM_END
3955
3956 // com.sun.tools.attach.VirtualMachine agent properties support
3957 //
3958 // Initialize the agent properties with the properties maintained in the VM
3959 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3960 JVMWrapper("JVM_InitAgentProperties");
3961 ResourceMark rm;
3962
3963 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3964
3965 PUTPROP(props, "sun.java.command", Arguments::java_command());
3966 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3967 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3968 return properties;
3969 JVM_END
3970
3971 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3972 {
3973 JVMWrapper("JVM_GetEnclosingMethodInfo");
3974 JvmtiVMObjectAllocEventCollector oam;
3975
3976 if (ofClass == NULL) {
3977 return NULL;
3978 }
3979 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3980 // Special handling for primitive objects
3981 if (java_lang_Class::is_primitive(mirror())) {
3982 return NULL;
3983 }
3984 Klass* k = java_lang_Class::as_Klass(mirror());
3985 if (!k->is_instance_klass()) {
3986 return NULL;
3987 }
3988 InstanceKlass* ik = InstanceKlass::cast(k);
3989 int encl_method_class_idx = ik->enclosing_method_class_index();
3990 if (encl_method_class_idx == 0) {
3991 return NULL;
3992 }
3993 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
3994 objArrayHandle dest(THREAD, dest_o);
3995 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3996 dest->obj_at_put(0, enc_k->java_mirror());
3997 int encl_method_method_idx = ik->enclosing_method_method_index();
3998 if (encl_method_method_idx != 0) {
3999 Symbol* sym = ik->constants()->symbol_at(
4000 extract_low_short_from_int(
4001 ik->constants()->name_and_type_at(encl_method_method_idx)));
4002 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
4003 dest->obj_at_put(1, str());
4004 sym = ik->constants()->symbol_at(
4005 extract_high_short_from_int(
4006 ik->constants()->name_and_type_at(encl_method_method_idx)));
4007 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
4008 dest->obj_at_put(2, str());
4009 }
4010 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
4011 }
4012 JVM_END
4013
4014 // Returns an array of java.lang.String objects containing the input arguments to the VM.
4015 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
4016 ResourceMark rm(THREAD);
4017
4018 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
4019 return NULL;
4020 }
4021
4022 char** vm_flags = Arguments::jvm_flags_array();
4023 char** vm_args = Arguments::jvm_args_array();
4024 int num_flags = Arguments::num_jvm_flags();
4025 int num_args = Arguments::num_jvm_args();
4026
4027 InstanceKlass* ik = SystemDictionary::String_klass();
4028 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
4029 objArrayHandle result_h(THREAD, r);
4030
4031 int index = 0;
4032 for (int j = 0; j < num_flags; j++, index++) {
4033 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
4034 result_h->obj_at_put(index, h());
4035 }
4036 for (int i = 0; i < num_args; i++, index++) {
4037 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
4038 result_h->obj_at_put(index, h());
4039 }
4040 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
4041 JVM_END
4042
4043 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
4044 return os::get_signal_number(name);
4045 JVM_END