1 /*
2 * Copyright (c) 1997, 2024, 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 "cds/cdsConfig.hpp"
27 #include "cds/classListParser.hpp"
28 #include "cds/classListWriter.hpp"
29 #include "cds/classPrelinker.hpp"
30 #include "cds/dynamicArchive.hpp"
31 #include "cds/heapShared.hpp"
32 #include "cds/lambdaFormInvokers.hpp"
33 #include "classfile/classFileStream.hpp"
34 #include "classfile/classLoader.inline.hpp"
35 #include "classfile/classLoaderData.hpp"
36 #include "classfile/classLoaderData.inline.hpp"
37 #include "classfile/classLoadInfo.hpp"
38 #include "classfile/javaAssertions.hpp"
39 #include "classfile/javaClasses.inline.hpp"
40 #include "classfile/moduleEntry.hpp"
41 #include "classfile/modules.hpp"
42 #include "classfile/packageEntry.hpp"
43 #include "classfile/stringTable.hpp"
44 #include "classfile/symbolTable.hpp"
45 #include "classfile/systemDictionary.hpp"
46 #include "classfile/vmClasses.hpp"
47 #include "classfile/vmSymbols.hpp"
48 #include "gc/shared/collectedHeap.inline.hpp"
49 #include "interpreter/bytecode.hpp"
50 #include "interpreter/bytecodeUtils.hpp"
51 #include "jfr/jfrEvents.hpp"
52 #include "jvm.h"
53 #include "logging/log.hpp"
54 #include "memory/oopFactory.hpp"
55 #include "memory/referenceType.hpp"
56 #include "memory/resourceArea.hpp"
57 #include "memory/universe.hpp"
58 #include "oops/access.inline.hpp"
59 #include "oops/constantPool.hpp"
60 #include "oops/fieldStreams.inline.hpp"
61 #include "oops/instanceKlass.hpp"
62 #include "oops/klass.inline.hpp"
63 #include "oops/method.hpp"
64 #include "oops/recordComponent.hpp"
65 #include "oops/objArrayKlass.hpp"
66 #include "oops/objArrayOop.inline.hpp"
67 #include "oops/oop.inline.hpp"
68 #include "prims/foreignGlobals.hpp"
69 #include "prims/jvm_misc.hpp"
70 #include "prims/jvmtiExport.hpp"
71 #include "prims/jvmtiThreadState.inline.hpp"
72 #include "prims/stackwalk.hpp"
73 #include "runtime/arguments.hpp"
74 #include "runtime/atomic.hpp"
75 #include "runtime/continuation.hpp"
76 #include "runtime/globals_extension.hpp"
77 #include "runtime/handles.inline.hpp"
78 #include "runtime/init.hpp"
79 #include "runtime/interfaceSupport.inline.hpp"
80 #include "runtime/deoptimization.hpp"
81 #include "runtime/handshake.hpp"
82 #include "runtime/java.hpp"
83 #include "runtime/javaCalls.hpp"
84 #include "runtime/javaThread.hpp"
85 #include "runtime/jfieldIDWorkaround.hpp"
86 #include "runtime/jniHandles.inline.hpp"
87 #include "runtime/os.inline.hpp"
88 #include "runtime/osThread.hpp"
89 #include "runtime/perfData.inline.hpp"
90 #include "runtime/reflection.hpp"
91 #include "runtime/synchronizer.hpp"
92 #include "runtime/threadIdentifier.hpp"
93 #include "runtime/threadSMR.hpp"
94 #include "runtime/vframe.inline.hpp"
95 #include "runtime/vmOperations.hpp"
96 #include "runtime/vm_version.hpp"
97 #include "services/attachListener.hpp"
98 #include "services/management.hpp"
99 #include "services/threadService.hpp"
100 #include "utilities/checkedCast.hpp"
101 #include "utilities/copy.hpp"
102 #include "utilities/defaultStream.hpp"
103 #include "utilities/dtrace.hpp"
104 #include "utilities/events.hpp"
105 #include "utilities/macros.hpp"
106 #include "utilities/utf8.hpp"
107 #include "utilities/zipLibrary.hpp"
108 #if INCLUDE_CDS
109 #include "classfile/systemDictionaryShared.hpp"
110 #endif
111 #if INCLUDE_JFR
112 #include "jfr/jfr.hpp"
113 #endif
114 #if INCLUDE_MANAGEMENT
115 #include "services/finalizerService.hpp"
116 #endif
117
118 #include <errno.h>
119
120 /*
121 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
122 such ctors and calls MUST NOT come between an oop declaration/init and its
123 usage because if objects are move this may cause various memory stomps, bus
124 errors and segfaults. Here is a cookbook for causing so called "naked oop
125 failures":
126
127 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
128 // Object address to be held directly in mirror & not visible to GC
129 oop mirror = JNIHandles::resolve_non_null(ofClass);
130
131 // If this ctor can hit a safepoint, moving objects around, then
132 ComplexConstructor foo;
133
134 // Boom! mirror may point to JUNK instead of the intended object
135 (some dereference of mirror)
136
137 // Here's another call that may block for GC, making mirror stale
138 MutexLocker ml(some_lock);
139
140 // And here's an initializer that can result in a stale oop
141 // all in one step.
142 oop o = call_that_can_throw_exception(TRAPS);
143
144
145 The solution is to keep the oop declaration BELOW the ctor or function
146 call that might cause a GC, do another resolve to reassign the oop, or
147 consider use of a Handle instead of an oop so there is immunity from object
148 motion. But note that the "QUICK" entries below do not have a handlemark
149 and thus can only support use of handles passed in.
150 */
151
152 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
153 ResourceMark rm;
154 int line_number = -1;
155 const char * source_file = nullptr;
156 const char * trace = "explicit";
157 InstanceKlass* caller = nullptr;
158 JavaThread* jthread = THREAD;
159 if (jthread->has_last_Java_frame()) {
160 vframeStream vfst(jthread);
161
162 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
163 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController");
164 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
165 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction");
166 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
167
168 Method* last_caller = nullptr;
169
170 while (!vfst.at_end()) {
171 Method* m = vfst.method();
172 if (!vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass())&&
173 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
174 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
175 break;
176 }
177 last_caller = m;
178 vfst.next();
179 }
180 // if this is called from Class.forName0 and that is called from Class.forName,
181 // then print the caller of Class.forName. If this is Class.loadClass, then print
182 // that caller, otherwise keep quiet since this should be picked up elsewhere.
183 bool found_it = false;
184 if (!vfst.at_end() &&
185 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
186 vfst.method()->name() == vmSymbols::forName0_name()) {
187 vfst.next();
188 if (!vfst.at_end() &&
189 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
190 vfst.method()->name() == vmSymbols::forName_name()) {
191 vfst.next();
192 found_it = true;
193 }
194 } else if (last_caller != nullptr &&
195 last_caller->method_holder()->name() ==
196 vmSymbols::java_lang_ClassLoader() &&
197 last_caller->name() == vmSymbols::loadClass_name()) {
198 found_it = true;
199 } else if (!vfst.at_end()) {
200 if (vfst.method()->is_native()) {
201 // JNI call
202 found_it = true;
203 }
204 }
205 if (found_it && !vfst.at_end()) {
206 // found the caller
207 caller = vfst.method()->method_holder();
208 line_number = vfst.method()->line_number_from_bci(vfst.bci());
209 if (line_number == -1) {
210 // show method name if it's a native method
211 trace = vfst.method()->name_and_sig_as_C_string();
212 }
213 Symbol* s = caller->source_file_name();
214 if (s != nullptr) {
215 source_file = s->as_C_string();
216 }
217 }
218 }
219 if (caller != nullptr) {
220 if (to_class != caller) {
221 const char * from = caller->external_name();
222 const char * to = to_class->external_name();
223 // print in a single call to reduce interleaving between threads
224 if (source_file != nullptr) {
225 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
226 } else {
227 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
228 }
229 }
230 }
231 }
232
233 void trace_class_resolution(Klass* to_class) {
234 EXCEPTION_MARK;
235 trace_class_resolution_impl(to_class, THREAD);
236 if (HAS_PENDING_EXCEPTION) {
237 CLEAR_PENDING_EXCEPTION;
238 }
239 }
240
241 // java.lang.System //////////////////////////////////////////////////////////////////////
242
243
244 JVM_LEAF_PROF(jlong, JVM_CurrentTimeMillis, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
245 return os::javaTimeMillis();
246 JVM_END
247
248 JVM_LEAF_PROF(jlong, JVM_NanoTime, JVM_NanoTime(JNIEnv *env, jclass ignored))
249 return os::javaTimeNanos();
250 JVM_END
251
252 // The function below is actually exposed by jdk.internal.misc.VM and not
253 // java.lang.System, but we choose to keep it here so that it stays next
254 // to JVM_CurrentTimeMillis and JVM_NanoTime
255
256 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
257 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
258
259 JVM_LEAF_PROF(jlong, JVM_GetNanoTimeAdjustment, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
260 jlong seconds;
261 jlong nanos;
262
263 os::javaTimeSystemUTC(seconds, nanos);
264
265 // We're going to verify that the result can fit in a long.
266 // For that we need the difference in seconds between 'seconds'
267 // and 'offset_secs' to be such that:
268 // |seconds - offset_secs| < (2^63/10^9)
269 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
270 // which makes |seconds - offset_secs| < 2^33
271 // and we will prefer +/- 2^32 as the maximum acceptable diff
272 // as 2^32 has a more natural feel than 2^33...
273 //
274 // So if |seconds - offset_secs| >= 2^32 - we return a special
275 // sentinel value (-1) which the caller should take as an
276 // exception value indicating that the offset given to us is
277 // too far from range of the current time - leading to too big
278 // a nano adjustment. The caller is expected to recover by
279 // computing a more accurate offset and calling this method
280 // again. (For the record 2^32 secs is ~136 years, so that
281 // should rarely happen)
282 //
283 jlong diff = seconds - offset_secs;
284 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
285 return -1; // sentinel value: the offset is too far off the target
286 }
287
288 // return the adjustment. If you compute a time by adding
289 // this number of nanoseconds along with the number of seconds
290 // in the offset you should get the current UTC time.
291 return (diff * (jlong)1000000000) + nanos;
292 JVM_END
293
294 JVM_ENTRY_PROF(void, JVM_ArrayCopy, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
295 jobject dst, jint dst_pos, jint length))
296 // Check if we have null pointers
297 if (src == nullptr || dst == nullptr) {
298 THROW(vmSymbols::java_lang_NullPointerException());
299 }
300 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
301 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
302 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
303 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
304 // Do copy
305 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
306 JVM_END
307
308
309 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
310 JavaValue r(T_OBJECT);
311 // public synchronized Object put(Object key, Object value);
312 HandleMark hm(THREAD);
313 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
314 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK);
315 JavaCalls::call_virtual(&r,
316 props,
317 vmClasses::Properties_klass(),
318 vmSymbols::put_name(),
319 vmSymbols::object_object_object_signature(),
320 key_str,
321 value_str,
322 THREAD);
323 }
324
325
326 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
327
328 /*
329 * Return all of the system properties in a Java String array with alternating
330 * names and values from the jvm SystemProperty.
331 * Which includes some internal and all commandline -D defined properties.
332 */
333 JVM_ENTRY_PROF(jobjectArray, JVM_GetProperties, JVM_GetProperties(JNIEnv *env))
334 ResourceMark rm(THREAD);
335 HandleMark hm(THREAD);
336 int ndx = 0;
337 int fixedCount = 2;
338
339 SystemProperty* p = Arguments::system_properties();
340 int count = Arguments::PropertyList_count(p);
341
342 // Allocate result String array
343 InstanceKlass* ik = vmClasses::String_klass();
344 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
345 objArrayHandle result_h(THREAD, r);
346
347 while (p != nullptr) {
348 const char * key = p->key();
349 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
350 const char * value = p->value();
351 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
352 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK_NULL);
353 result_h->obj_at_put(ndx * 2, key_str());
354 result_h->obj_at_put(ndx * 2 + 1, value_str());
355 ndx++;
356 }
357 p = p->next();
358 }
359
360 // Convert the -XX:MaxDirectMemorySize= command line flag
361 // to the sun.nio.MaxDirectMemorySize property.
362 // Do this after setting user properties to prevent people
363 // from setting the value with a -D option, as requested.
364 // Leave empty if not supplied
365 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
366 char as_chars[256];
367 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
368 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
369 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
370 result_h->obj_at_put(ndx * 2, key_str());
371 result_h->obj_at_put(ndx * 2 + 1, value_str());
372 ndx++;
373 }
374
375 // JVM monitoring and management support
376 // Add the sun.management.compiler property for the compiler's name
377 {
378 #undef CSIZE
379 #if defined(_LP64) || defined(_WIN64)
380 #define CSIZE "64-Bit "
381 #else
382 #define CSIZE
383 #endif // 64bit
384
385 #if COMPILER1_AND_COMPILER2
386 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
387 #else
388 #if defined(COMPILER1)
389 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
390 #elif defined(COMPILER2)
391 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
392 #elif INCLUDE_JVMCI
393 #error "INCLUDE_JVMCI should imply COMPILER1_OR_COMPILER2"
394 #else
395 const char* compiler_name = "";
396 #endif // compilers
397 #endif // COMPILER1_AND_COMPILER2
398
399 if (*compiler_name != '\0' &&
400 (Arguments::mode() != Arguments::_int)) {
401 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
402 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
403 result_h->obj_at_put(ndx * 2, key_str());
404 result_h->obj_at_put(ndx * 2 + 1, value_str());
405 ndx++;
406 }
407 }
408
409 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
410 JVM_END
411
412
413 /*
414 * Return the temporary directory that the VM uses for the attach
415 * and perf data files.
416 *
417 * It is important that this directory is well-known and the
418 * same for all VM instances. It cannot be affected by configuration
419 * variables such as java.io.tmpdir.
420 */
421 JVM_ENTRY_PROF(jstring, JVM_GetTemporaryDirectory, JVM_GetTemporaryDirectory(JNIEnv *env))
422 HandleMark hm(THREAD);
423 const char* temp_dir = os::get_temp_directory();
424 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
425 return (jstring) JNIHandles::make_local(THREAD, h());
426 JVM_END
427
428
429 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
430
431 extern volatile jint vm_created;
432
433 JVM_ENTRY_NO_ENV_PROF(void, JVM_BeforeHalt, JVM_BeforeHalt())
434 EventShutdown event;
435 if (event.should_commit()) {
436 event.set_reason("Shutdown requested from Java");
437 event.commit();
438 }
439 JVM_END
440
441
442 JVM_ENTRY_NO_ENV_PROF(void, JVM_Halt, JVM_Halt(jint code))
443 before_exit(thread, true);
444 vm_exit(code);
445 JVM_END
446
447
448 JVM_ENTRY_NO_ENV_PROF(void, JVM_GC, JVM_GC(void))
449 if (!DisableExplicitGC) {
450 EventSystemGC event;
451 event.set_invokedConcurrent(ExplicitGCInvokesConcurrent);
452 Universe::heap()->collect(GCCause::_java_lang_system_gc);
453 event.commit();
454 }
455 JVM_END
456
457
458 JVM_LEAF_PROF(jlong, JVM_MaxObjectInspectionAge, JVM_MaxObjectInspectionAge(void))
459 return Universe::heap()->millis_since_last_whole_heap_examined();
460 JVM_END
461
462
463 static inline jlong convert_size_t_to_jlong(size_t val) {
464 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
465 NOT_LP64 (return (jlong)val;)
466 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
467 }
468
469 JVM_ENTRY_NO_ENV_PROF(jlong, JVM_TotalMemory, JVM_TotalMemory(void))
470 size_t n = Universe::heap()->capacity();
471 return convert_size_t_to_jlong(n);
472 JVM_END
473
474
475 JVM_ENTRY_NO_ENV_PROF(jlong, JVM_FreeMemory, JVM_FreeMemory(void))
476 size_t n = Universe::heap()->unused();
477 return convert_size_t_to_jlong(n);
478 JVM_END
479
480
481 JVM_ENTRY_NO_ENV_PROF(jlong, JVM_MaxMemory, JVM_MaxMemory(void))
482 size_t n = Universe::heap()->max_capacity();
483 return convert_size_t_to_jlong(n);
484 JVM_END
485
486
487 JVM_ENTRY_NO_ENV_PROF(jint, JVM_ActiveProcessorCount, JVM_ActiveProcessorCount(void))
488 return os::active_processor_count();
489 JVM_END
490
491 JVM_LEAF_PROF(jboolean, JVM_IsUseContainerSupport, JVM_IsUseContainerSupport(void))
492 #ifdef LINUX
493 if (UseContainerSupport) {
494 return JNI_TRUE;
495 }
496 #endif
497 return JNI_FALSE;
498 JVM_END
499
500 // java.lang.Throwable //////////////////////////////////////////////////////
501
502 JVM_ENTRY_PROF(void, JVM_FillInStackTrace, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
503 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
504 java_lang_Throwable::fill_in_stack_trace(exception);
505 JVM_END
506
507 // java.lang.NullPointerException ///////////////////////////////////////////
508
509 JVM_ENTRY_PROF(jstring, JVM_GetExtendedNPEMessage, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
510 if (!ShowCodeDetailsInExceptionMessages) return nullptr;
511
512 oop exc = JNIHandles::resolve_non_null(throwable);
513
514 Method* method;
515 int bci;
516 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
517 return nullptr;
518 }
519 if (method->is_native()) {
520 return nullptr;
521 }
522
523 stringStream ss;
524 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
525 if (ok) {
526 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL);
527 return (jstring) JNIHandles::make_local(THREAD, result);
528 } else {
529 return nullptr;
530 }
531 JVM_END
532
533 // java.lang.StackTraceElement //////////////////////////////////////////////
534
535
536 JVM_ENTRY_PROF(void, JVM_InitStackTraceElementArray, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth))
537 Handle backtraceh(THREAD, JNIHandles::resolve(backtrace));
538 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
539 objArrayHandle stack_trace(THREAD, st);
540 // Fill in the allocated stack trace
541 java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK);
542 JVM_END
543
544
545 JVM_ENTRY_PROF(void, JVM_InitStackTraceElement, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
546 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
547 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
548 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, CHECK);
549 JVM_END
550
551
552 // java.lang.StackWalker //////////////////////////////////////////////////////
553 JVM_ENTRY_PROF(void, JVM_ExpandStackFrameInfo, JVM_ExpandStackFrameInfo(JNIEnv *env, jobject obj))
554 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(obj));
555
556 bool have_name = (java_lang_StackFrameInfo::name(stack_frame_info()) != nullptr);
557 bool have_type = (java_lang_StackFrameInfo::type(stack_frame_info()) != nullptr);
558 Method* method = java_lang_StackFrameInfo::get_method(stack_frame_info());
559 if (!have_name) {
560 oop name = StringTable::intern(method->name(), CHECK);
561 java_lang_StackFrameInfo::set_name(stack_frame_info(), name);
562 }
563 if (!have_type) {
564 Handle type = java_lang_String::create_from_symbol(method->signature(), CHECK);
565 java_lang_StackFrameInfo::set_type(stack_frame_info(), type());
566 }
567 JVM_END
568
569 JVM_ENTRY_PROF(jobject, JVM_CallStackWalk, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jint mode,
570 jint skip_frames, jobject contScope, jobject cont,
571 jint buffer_size, jint start_index, jobjectArray frames))
572 if (!thread->has_last_Java_frame()) {
573 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", nullptr);
574 }
575
576 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
577 Handle contScope_h(THREAD, JNIHandles::resolve(contScope));
578 Handle cont_h(THREAD, JNIHandles::resolve(cont));
579 // frames array is a ClassFrameInfo[] array when only getting caller reference,
580 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
581 // be null.
582 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
583 objArrayHandle frames_array_h(THREAD, fa);
584
585 if (frames_array_h->length() < buffer_size) {
586 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", nullptr);
587 }
588
589 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h,
590 buffer_size, start_index, frames_array_h, CHECK_NULL);
591 return JNIHandles::make_local(THREAD, result);
592 JVM_END
593
594
595 JVM_ENTRY_PROF(jint, JVM_MoreStackWalk, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jint mode, jlong anchor,
596 jint last_batch_count, jint buffer_size, jint start_index,
597 jobjectArray frames))
598 // frames array is a ClassFrameInfo[] array when only getting caller reference,
599 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
600 // be null.
601 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
602 objArrayHandle frames_array_h(THREAD, fa);
603
604 if (frames_array_h->length() < buffer_size) {
605 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
606 }
607
608 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
609 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, last_batch_count, buffer_size,
610 start_index, frames_array_h, THREAD);
611 JVM_END
612
613 JVM_ENTRY_PROF(void, JVM_SetStackWalkContinuation, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont))
614 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
615 objArrayHandle frames_array_h(THREAD, fa);
616 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
617 Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont));
618
619 StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD);
620 JVM_END
621
622 // java.lang.Object ///////////////////////////////////////////////
623
624
625 JVM_ENTRY_PROF(jint, JVM_IHashCode, JVM_IHashCode(JNIEnv* env, jobject handle))
626 // as implemented in the classic virtual machine; return 0 if object is null
627 return handle == nullptr ? 0 :
628 checked_cast<jint>(ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)));
629 JVM_END
630
631
632 JVM_ENTRY_PROF(void, JVM_MonitorWait, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
633 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
634 JavaThreadInObjectWaitState jtiows(thread, ms != 0);
635 if (JvmtiExport::should_post_monitor_wait()) {
636 JvmtiExport::post_monitor_wait(thread, obj(), ms);
637
638 // The current thread already owns the monitor and it has not yet
639 // been added to the wait queue so the current thread cannot be
640 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
641 // event handler cannot accidentally consume an unpark() meant for
642 // the ParkEvent associated with this ObjectMonitor.
643 }
644 ObjectSynchronizer::wait(obj, ms, CHECK);
645 JVM_END
646
647
648 JVM_ENTRY_PROF(void, JVM_MonitorNotify, JVM_MonitorNotify(JNIEnv* env, jobject handle))
649 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
650 ObjectSynchronizer::notify(obj, CHECK);
651 JVM_END
652
653
654 JVM_ENTRY_PROF(void, JVM_MonitorNotifyAll, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
655 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
656 ObjectSynchronizer::notifyall(obj, CHECK);
657 JVM_END
658
659
660 JVM_ENTRY_PROF(jobject, JVM_Clone, JVM_Clone(JNIEnv* env, jobject handle))
661 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
662 Klass* klass = obj->klass();
663 JvmtiVMObjectAllocEventCollector oam;
664
665 #ifdef ASSERT
666 // Just checking that the cloneable flag is set correct
667 if (obj->is_array()) {
668 guarantee(klass->is_cloneable(), "all arrays are cloneable");
669 } else {
670 guarantee(obj->is_instance(), "should be instanceOop");
671 bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass());
672 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
673 }
674 #endif
675
676 // Check if class of obj supports the Cloneable interface.
677 // All arrays are considered to be cloneable (See JLS 20.1.5).
678 // All j.l.r.Reference classes are considered non-cloneable.
679 if (!klass->is_cloneable() ||
680 (klass->is_instance_klass() &&
681 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
682 ResourceMark rm(THREAD);
683 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
684 }
685
686 // Make shallow object copy
687 const size_t size = obj->size();
688 oop new_obj_oop = nullptr;
689 if (obj->is_array()) {
690 const int length = ((arrayOop)obj())->length();
691 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
692 /* do_zero */ true, CHECK_NULL);
693 } else {
694 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
695 }
696
697 HeapAccess<>::clone(obj(), new_obj_oop, size);
698
699 Handle new_obj(THREAD, new_obj_oop);
700 // Caution: this involves a java upcall, so the clone should be
701 // "gc-robust" by this stage.
702 if (klass->has_finalizer()) {
703 assert(obj->is_instance(), "should be instanceOop");
704 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
705 new_obj = Handle(THREAD, new_obj_oop);
706 }
707
708 return JNIHandles::make_local(THREAD, new_obj());
709 JVM_END
710
711 // java.lang.ref.Finalizer ////////////////////////////////////////////////////
712
713 JVM_ENTRY_PROF(void, JVM_ReportFinalizationComplete, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee))
714 MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);)
715 JVM_END
716
717 JVM_LEAF_PROF(jboolean, JVM_IsFinalizationEnabled, JVM_IsFinalizationEnabled(JNIEnv * env))
718 return InstanceKlass::is_finalization_enabled();
719 JVM_END
720
721 // jdk.internal.vm.Continuation /////////////////////////////////////////////////////
722
723 JVM_ENTRY_PROF(void, JVM_RegisterContinuationMethods, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls))
724 CONT_RegisterNativeMethods(env, cls);
725 JVM_END
726
727 // java.io.File ///////////////////////////////////////////////////////////////
728
729 JVM_LEAF_PROF(char*, JVM_NativePath, JVM_NativePath(char* path))
730 return os::native_path(path);
731 JVM_END
732
733
734 // Misc. class handling ///////////////////////////////////////////////////////////
735
736
737 JVM_ENTRY_PROF(jclass, JVM_GetCallerClass, JVM_GetCallerClass(JNIEnv* env))
738 // Getting the class of the caller frame.
739 //
740 // The call stack at this point looks something like this:
741 //
742 // [0] [ @CallerSensitive public jdk.internal.reflect.Reflection.getCallerClass ]
743 // [1] [ @CallerSensitive API.method ]
744 // [.] [ (skipped intermediate frames) ]
745 // [n] [ caller ]
746 vframeStream vfst(thread);
747 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
748 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
749 Method* m = vfst.method();
750 assert(m != nullptr, "sanity");
751 switch (n) {
752 case 0:
753 // This must only be called from Reflection.getCallerClass
754 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
755 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
756 }
757 // fall-through
758 case 1:
759 // Frame 0 and 1 must be caller sensitive.
760 if (!m->caller_sensitive()) {
761 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
762 }
763 break;
764 default:
765 if (!m->is_ignored_by_security_stack_walk()) {
766 // We have reached the desired frame; return the holder class.
767 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror());
768 }
769 break;
770 }
771 }
772 return nullptr;
773 JVM_END
774
775
776 JVM_ENTRY_PROF(jclass, JVM_FindPrimitiveClass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
777 oop mirror = nullptr;
778 BasicType t = name2type(utf);
779 if (t != T_ILLEGAL && !is_reference_type(t)) {
780 mirror = Universe::java_mirror(t);
781 }
782 if (mirror == nullptr) {
783 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
784 } else {
785 return (jclass) JNIHandles::make_local(THREAD, mirror);
786 }
787 JVM_END
788
789
790 // Returns a class loaded by the bootstrap class loader; or null
791 // if not found. ClassNotFoundException is not thrown.
792 // FindClassFromBootLoader is exported to the launcher for windows.
793 JVM_ENTRY_PROF(jclass, JVM_FindClassFromBootLoader, JVM_FindClassFromBootLoader(JNIEnv* env, const char* name))
794 // Java libraries should ensure that name is never null or illegal.
795 if (name == nullptr || (int)strlen(name) > Symbol::max_length()) {
796 // It's impossible to create this class; the name cannot fit
797 // into the constant pool.
798 return nullptr;
799 }
800 assert(UTF8::is_legal_utf8((const unsigned char*)name, (int)strlen(name), false), "illegal UTF name");
801
802 TempNewSymbol h_name = SymbolTable::new_symbol(name);
803 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
804 if (k == nullptr) {
805 return nullptr;
806 }
807
808 if (log_is_enabled(Debug, class, resolve)) {
809 trace_class_resolution(k);
810 }
811 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
812 JVM_END
813
814 // Find a class with this name in this loader, using the caller's protection domain.
815 JVM_ENTRY_PROF(jclass, JVM_FindClassFromCaller, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
816 jboolean init, jobject loader,
817 jclass caller))
818 TempNewSymbol h_name =
819 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
820 CHECK_NULL);
821
822 oop loader_oop = JNIHandles::resolve(loader);
823 oop from_class = JNIHandles::resolve(caller);
824 oop protection_domain = nullptr;
825 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
826 // NPE. Put it in another way, the bootstrap class loader has all permission and
827 // thus no checkPackageAccess equivalence in the VM class loader.
828 // The caller is also passed as null by the java code if there is no security
829 // manager to avoid the performance cost of getting the calling class.
830 if (from_class != nullptr && loader_oop != nullptr) {
831 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
832 }
833
834 Handle h_loader(THREAD, loader_oop);
835 Handle h_prot(THREAD, protection_domain);
836 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
837 h_prot, false, THREAD);
838
839 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
840 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
841 }
842 return result;
843 JVM_END
844
845 // Currently only called from the old verifier.
846 JVM_ENTRY_PROF(jclass, JVM_FindClassFromClass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
847 jboolean init, jclass from))
848 TempNewSymbol h_name =
849 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
850 CHECK_NULL);
851 oop from_class_oop = JNIHandles::resolve(from);
852 Klass* from_class = (from_class_oop == nullptr)
853 ? (Klass*)nullptr
854 : java_lang_Class::as_Klass(from_class_oop);
855 oop class_loader = nullptr;
856 oop protection_domain = nullptr;
857 if (from_class != nullptr) {
858 class_loader = from_class->class_loader();
859 protection_domain = from_class->protection_domain();
860 }
861 Handle h_loader(THREAD, class_loader);
862 Handle h_prot (THREAD, protection_domain);
863 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
864 h_prot, true, thread);
865
866 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
867 // this function is generally only used for class loading during verification.
868 ResourceMark rm;
869 oop from_mirror = JNIHandles::resolve_non_null(from);
870 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
871 const char * from_name = from_class->external_name();
872
873 oop mirror = JNIHandles::resolve_non_null(result);
874 Klass* to_class = java_lang_Class::as_Klass(mirror);
875 const char * to = to_class->external_name();
876 log_debug(class, resolve)("%s %s (verification)", from_name, to);
877 }
878
879 return result;
880 JVM_END
881
882 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
883 static jclass jvm_define_class_common(const char *name,
884 jobject loader, const jbyte *buf,
885 jsize len, jobject pd, const char *source,
886 TRAPS) {
887 if (source == nullptr) source = "__JVM_DefineClass__";
888
889 JavaThread* jt = THREAD;
890
891 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
892 ClassLoader::perf_define_appclass_selftime(),
893 ClassLoader::perf_define_appclasses(),
894 jt->get_thread_stat()->perf_recursion_counts_addr(),
895 jt->get_thread_stat()->perf_timers_addr(),
896 PerfClassTraceTime::DEFINE_CLASS);
897
898 if (UsePerfData) {
899 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
900 }
901
902 // Class resolution will get the class name from the .class stream if the name is null.
903 TempNewSymbol class_name = name == nullptr ? nullptr :
904 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
905 CHECK_NULL);
906
907 ResourceMark rm(THREAD);
908 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
909 Handle class_loader (THREAD, JNIHandles::resolve(loader));
910 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
911 ClassLoadInfo cl_info(protection_domain);
912 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name,
913 class_loader,
914 cl_info,
915 CHECK_NULL);
916
917 if (log_is_enabled(Debug, class, resolve)) {
918 trace_class_resolution(k);
919 }
920
921 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
922 }
923
924 enum {
925 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
926 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
927 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
928 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
929 };
930
931 /*
932 * Define a class with the specified flags that indicates if it's a nestmate,
933 * hidden, or strongly referenced from class loader.
934 */
935 static jclass jvm_lookup_define_class(jclass lookup, const char *name,
936 const jbyte *buf, jsize len, jobject pd,
937 jboolean init, int flags, jobject classData, TRAPS) {
938 ResourceMark rm(THREAD);
939
940 Klass* lookup_k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(lookup));
941 // Lookup class must be a non-null instance
942 if (lookup_k == nullptr) {
943 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
944 }
945 assert(lookup_k->is_instance_klass(), "Lookup class must be an instance klass");
946
947 Handle class_loader (THREAD, lookup_k->class_loader());
948
949 bool is_nestmate = (flags & NESTMATE) == NESTMATE;
950 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
951 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
952 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
953
954 InstanceKlass* host_class = nullptr;
955 if (is_nestmate) {
956 host_class = InstanceKlass::cast(lookup_k)->nest_host(CHECK_NULL);
957 }
958
959 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
960 name,
961 is_nestmate ? "with dynamic nest-host " : "non-nestmate",
962 is_nestmate ? host_class->external_name() : "",
963 is_hidden ? "hidden" : "not hidden",
964 is_strong ? "strong" : "weak",
965 vm_annotations ? "with vm annotations" : "without vm annotation");
966
967 if (!is_hidden) {
968 // classData is only applicable for hidden classes
969 if (classData != nullptr) {
970 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
971 }
972 if (is_nestmate) {
973 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
974 }
975 if (!is_strong) {
976 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
977 }
978 if (vm_annotations) {
979 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
980 }
981 if (flags != STRONG_LOADER_LINK) {
982 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
983 err_msg("invalid flag 0x%x", flags));
984 }
985 }
986
987 // Class resolution will get the class name from the .class stream if the name is null.
988 TempNewSymbol class_name = name == nullptr ? nullptr :
989 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
990 CHECK_NULL);
991
992 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
993 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
994 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
995
996 InstanceKlass* ik = nullptr;
997 if (!is_hidden) {
998 ClassLoadInfo cl_info(protection_domain);
999 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1000 class_loader,
1001 cl_info,
1002 CHECK_NULL);
1003
1004 if (log_is_enabled(Debug, class, resolve)) {
1005 trace_class_resolution(ik);
1006 }
1007 } else { // hidden
1008 Handle classData_h(THREAD, JNIHandles::resolve(classData));
1009 ClassLoadInfo cl_info(protection_domain,
1010 host_class,
1011 classData_h,
1012 is_hidden,
1013 is_strong,
1014 vm_annotations);
1015 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1016 class_loader,
1017 cl_info,
1018 CHECK_NULL);
1019
1020 // The hidden class loader data has been artificially been kept alive to
1021 // this point. The mirror and any instances of this class have to keep
1022 // it alive afterwards.
1023 ik->class_loader_data()->dec_keep_alive();
1024
1025 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1026 ModuleEntry* module = ik->module();
1027 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1028 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1029 module_name,
1030 ik->external_name(),
1031 host_class->external_name(),
1032 ik->is_hidden() ? "is hidden" : "is not hidden");
1033 }
1034 }
1035
1036 if ((!is_hidden || is_nestmate) && !Reflection::is_same_class_package(lookup_k, ik)) {
1037 // non-hidden class or nestmate class must be in the same package as the Lookup class
1038 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class and defined class are in different packages");
1039 }
1040
1041 if (init) {
1042 ik->initialize(CHECK_NULL);
1043 } else {
1044 ik->link_class(CHECK_NULL);
1045 }
1046
1047 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror());
1048 }
1049
1050 JVM_ENTRY_PROF(jclass, JVM_DefineClass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1051 return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD);
1052 JVM_END
1053
1054 /*
1055 * Define a class with the specified lookup class.
1056 * lookup: Lookup class
1057 * name: the name of the class
1058 * buf: class bytes
1059 * len: length of class bytes
1060 * pd: protection domain
1061 * init: initialize the class
1062 * flags: properties of the class
1063 * classData: private static pre-initialized field
1064 */
1065 JVM_ENTRY_PROF(jclass, JVM_LookupDefineClass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1066 jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1067
1068 if (lookup == nullptr) {
1069 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1070 }
1071
1072 assert(buf != nullptr, "buf must not be null");
1073
1074 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1075 JVM_END
1076
1077 JVM_ENTRY_PROF(jclass, JVM_DefineClassWithSource, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1078 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD);
1079 JVM_END
1080
1081 JVM_ENTRY_PROF(jclass, JVM_FindLoadedClass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1082 ResourceMark rm(THREAD);
1083
1084 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1085 char* str = java_lang_String::as_utf8_string(h_name());
1086
1087 // Sanity check, don't expect null
1088 if (str == nullptr) return nullptr;
1089
1090 // Internalize the string, converting '.' to '/' in string.
1091 char* p = (char*)str;
1092 while (*p != '\0') {
1093 if (*p == '.') {
1094 *p = '/';
1095 }
1096 p++;
1097 }
1098
1099 const int str_len = (int)(p - str);
1100 if (str_len > Symbol::max_length()) {
1101 // It's impossible to create this class; the name cannot fit
1102 // into the constant pool.
1103 return nullptr;
1104 }
1105 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1106
1107 // Security Note:
1108 // The Java level wrapper will perform the necessary security check allowing
1109 // us to pass the null as the initiating class loader.
1110 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1111 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name,
1112 h_loader,
1113 Handle());
1114 #if INCLUDE_CDS
1115 if (k == nullptr) {
1116 // If the class is not already loaded, try to see if it's in the shared
1117 // archive for the current classloader (h_loader).
1118 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1119 }
1120 #endif
1121 return (k == nullptr) ? nullptr :
1122 (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1123 JVM_END
1124
1125 // Module support //////////////////////////////////////////////////////////////////////////////
1126
1127 JVM_ENTRY_PROF(void, JVM_DefineModule, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1128 jstring location, jobjectArray packages))
1129 Handle h_module (THREAD, JNIHandles::resolve(module));
1130 Modules::define_module(h_module, is_open, version, location, packages, CHECK);
1131 JVM_END
1132
1133 JVM_ENTRY_PROF(void, JVM_SetBootLoaderUnnamedModule, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1134 Handle h_module (THREAD, JNIHandles::resolve(module));
1135 Modules::set_bootloader_unnamed_module(h_module, CHECK);
1136 JVM_END
1137
1138 JVM_ENTRY_PROF(void, JVM_AddModuleExports, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1139 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1140 Handle h_to_module (THREAD, JNIHandles::resolve(to_module));
1141 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK);
1142 JVM_END
1143
1144 JVM_ENTRY_PROF(void, JVM_AddModuleExportsToAllUnnamed, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1145 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1146 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK);
1147 JVM_END
1148
1149 JVM_ENTRY_PROF(void, JVM_AddModuleExportsToAll, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1150 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1151 Modules::add_module_exports(h_from_module, package, Handle(), CHECK);
1152 JVM_END
1153
1154 JVM_ENTRY_PROF(void, JVM_AddReadsModule, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1155 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1156 Handle h_source_module (THREAD, JNIHandles::resolve(source_module));
1157 Modules::add_reads_module(h_from_module, h_source_module, CHECK);
1158 JVM_END
1159
1160 JVM_ENTRY_PROF(void, JVM_DefineArchivedModules, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader))
1161 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader));
1162 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader));
1163 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK);
1164 JVM_END
1165
1166 // Reflection support //////////////////////////////////////////////////////////////////////////////
1167
1168 JVM_ENTRY_PROF(jstring, JVM_InitClassName, JVM_InitClassName(JNIEnv *env, jclass cls))
1169 assert (cls != nullptr, "illegal class");
1170 JvmtiVMObjectAllocEventCollector oam;
1171 ResourceMark rm(THREAD);
1172 HandleMark hm(THREAD);
1173 Handle java_class(THREAD, JNIHandles::resolve(cls));
1174 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1175 return (jstring) JNIHandles::make_local(THREAD, result);
1176 JVM_END
1177
1178
1179 JVM_ENTRY_PROF(jobjectArray, JVM_GetClassInterfaces, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1180 JvmtiVMObjectAllocEventCollector oam;
1181 oop mirror = JNIHandles::resolve_non_null(cls);
1182
1183 // Special handling for primitive objects
1184 if (java_lang_Class::is_primitive(mirror)) {
1185 // Primitive objects does not have any interfaces
1186 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1187 return (jobjectArray) JNIHandles::make_local(THREAD, r);
1188 }
1189
1190 Klass* klass = java_lang_Class::as_Klass(mirror);
1191 // Figure size of result array
1192 int size;
1193 if (klass->is_instance_klass()) {
1194 size = InstanceKlass::cast(klass)->local_interfaces()->length();
1195 } else {
1196 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1197 size = 2;
1198 }
1199
1200 // Allocate result array
1201 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL);
1202 objArrayHandle result (THREAD, r);
1203 // Fill in result
1204 if (klass->is_instance_klass()) {
1205 // Regular instance klass, fill in all local interfaces
1206 for (int index = 0; index < size; index++) {
1207 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1208 result->obj_at_put(index, k->java_mirror());
1209 }
1210 } else {
1211 // All arrays implement java.lang.Cloneable and java.io.Serializable
1212 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror());
1213 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror());
1214 }
1215 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1216 JVM_END
1217
1218
1219 JVM_ENTRY_PROF(jboolean, JVM_IsInterface, JVM_IsInterface(JNIEnv *env, jclass cls))
1220 oop mirror = JNIHandles::resolve_non_null(cls);
1221 if (java_lang_Class::is_primitive(mirror)) {
1222 return JNI_FALSE;
1223 }
1224 Klass* k = java_lang_Class::as_Klass(mirror);
1225 jboolean result = k->is_interface();
1226 assert(!result || k->is_instance_klass(),
1227 "all interfaces are instance types");
1228 // The compiler intrinsic for isInterface tests the
1229 // Klass::_access_flags bits in the same way.
1230 return result;
1231 JVM_END
1232
1233 JVM_ENTRY_PROF(jboolean, JVM_IsHiddenClass, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1234 oop mirror = JNIHandles::resolve_non_null(cls);
1235 if (java_lang_Class::is_primitive(mirror)) {
1236 return JNI_FALSE;
1237 }
1238 Klass* k = java_lang_Class::as_Klass(mirror);
1239 return k->is_hidden();
1240 JVM_END
1241
1242 JVM_ENTRY_PROF(jobjectArray, JVM_GetClassSigners, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1243 JvmtiVMObjectAllocEventCollector oam;
1244 oop mirror = JNIHandles::resolve_non_null(cls);
1245 if (java_lang_Class::is_primitive(mirror)) {
1246 // There are no signers for primitive types
1247 return nullptr;
1248 }
1249
1250 objArrayHandle signers(THREAD, java_lang_Class::signers(mirror));
1251
1252 // If there are no signers set in the class, or if the class
1253 // is an array, return null.
1254 if (signers == nullptr) return nullptr;
1255
1256 // copy of the signers array
1257 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1258 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1259 for (int index = 0; index < signers->length(); index++) {
1260 signers_copy->obj_at_put(index, signers->obj_at(index));
1261 }
1262
1263 // return the copy
1264 return (jobjectArray) JNIHandles::make_local(THREAD, signers_copy);
1265 JVM_END
1266
1267
1268 JVM_ENTRY_PROF(void, JVM_SetClassSigners, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1269 oop mirror = JNIHandles::resolve_non_null(cls);
1270 if (!java_lang_Class::is_primitive(mirror)) {
1271 // This call is ignored for primitive types and arrays.
1272 // Signers are only set once, ClassLoader.java, and thus shouldn't
1273 // be called with an array. Only the bootstrap loader creates arrays.
1274 Klass* k = java_lang_Class::as_Klass(mirror);
1275 if (k->is_instance_klass()) {
1276 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1277 }
1278 }
1279 JVM_END
1280
1281
1282 JVM_ENTRY_PROF(jobject, JVM_GetProtectionDomain, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1283 oop mirror = JNIHandles::resolve_non_null(cls);
1284 if (mirror == nullptr) {
1285 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
1286 }
1287
1288 if (java_lang_Class::is_primitive(mirror)) {
1289 // Primitive types does not have a protection domain.
1290 return nullptr;
1291 }
1292
1293 oop pd = java_lang_Class::protection_domain(mirror);
1294 return (jobject) JNIHandles::make_local(THREAD, pd);
1295 JVM_END
1296
1297
1298 // Returns the inherited_access_control_context field of the running thread.
1299 JVM_ENTRY_PROF(jobject, JVM_GetInheritedAccessControlContext, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1300 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1301 return JNIHandles::make_local(THREAD, result);
1302 JVM_END
1303
1304 JVM_ENTRY_PROF(jobject, JVM_GetStackAccessControlContext, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1305 if (!UsePrivilegedStack) return nullptr;
1306
1307 ResourceMark rm(THREAD);
1308 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1309 JvmtiVMObjectAllocEventCollector oam;
1310
1311 // count the protection domains on the execution stack. We collapse
1312 // duplicate consecutive protection domains into a single one, as
1313 // well as stopping when we hit a privileged frame.
1314
1315 oop previous_protection_domain = nullptr;
1316 Handle privileged_context(thread, nullptr);
1317 bool is_privileged = false;
1318 oop protection_domain = nullptr;
1319
1320 // Iterate through Java frames
1321 vframeStream vfst(thread);
1322 for(; !vfst.at_end(); vfst.next()) {
1323 // get method of frame
1324 Method* method = vfst.method();
1325
1326 // stop at the first privileged frame
1327 if (method->method_holder() == vmClasses::AccessController_klass() &&
1328 method->name() == vmSymbols::executePrivileged_name())
1329 {
1330 // this frame is privileged
1331 is_privileged = true;
1332
1333 javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged
1334
1335 StackValueCollection* locals = priv->locals();
1336 StackValue* ctx_sv = locals->at(1); // AccessControlContext context
1337 StackValue* clr_sv = locals->at(2); // Class<?> caller
1338 assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1339 assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1340 privileged_context = ctx_sv->get_obj();
1341 Handle caller = clr_sv->get_obj();
1342
1343 Klass *caller_klass = java_lang_Class::as_Klass(caller());
1344 protection_domain = caller_klass->protection_domain();
1345 } else {
1346 protection_domain = method->method_holder()->protection_domain();
1347 }
1348
1349 if ((previous_protection_domain != protection_domain) && (protection_domain != nullptr)) {
1350 local_array->push(Handle(thread, protection_domain));
1351 previous_protection_domain = protection_domain;
1352 }
1353
1354 if (is_privileged) break;
1355 }
1356
1357
1358 // either all the domains on the stack were system domains, or
1359 // we had a privileged system domain
1360 if (local_array->is_empty()) {
1361 if (is_privileged && privileged_context.is_null()) return nullptr;
1362
1363 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1364 return JNIHandles::make_local(THREAD, result);
1365 }
1366
1367 objArrayOop context = oopFactory::new_objArray(vmClasses::ProtectionDomain_klass(),
1368 local_array->length(), CHECK_NULL);
1369 objArrayHandle h_context(thread, context);
1370 for (int index = 0; index < local_array->length(); index++) {
1371 h_context->obj_at_put(index, local_array->at(index)());
1372 }
1373
1374 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1375
1376 return JNIHandles::make_local(THREAD, result);
1377 JVM_END
1378
1379 class ScopedValueBindingsResolver {
1380 public:
1381 InstanceKlass* Carrier_klass;
1382 ScopedValueBindingsResolver(JavaThread* THREAD) {
1383 Klass *k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ScopedValue_Carrier(), true, THREAD);
1384 Carrier_klass = InstanceKlass::cast(k);
1385 }
1386 };
1387
1388 JVM_ENTRY_PROF(jobject, JVM_FindScopedValueBindings, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls))
1389 ResourceMark rm(THREAD);
1390 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1391 JvmtiVMObjectAllocEventCollector oam;
1392
1393 static ScopedValueBindingsResolver resolver(THREAD);
1394
1395 // Iterate through Java frames
1396 vframeStream vfst(thread);
1397 for(; !vfst.at_end(); vfst.next()) {
1398 int loc = -1;
1399 // get method of frame
1400 Method* method = vfst.method();
1401
1402 Symbol *name = method->name();
1403
1404 InstanceKlass* holder = method->method_holder();
1405 if (name == vmSymbols::runWith_method_name()) {
1406 if (holder == vmClasses::Thread_klass()
1407 || holder == resolver.Carrier_klass) {
1408 loc = 1;
1409 }
1410 }
1411
1412 if (loc != -1) {
1413 javaVFrame *frame = vfst.asJavaVFrame();
1414 StackValueCollection* locals = frame->locals();
1415 StackValue* head_sv = locals->at(loc); // java/lang/ScopedValue$Snapshot
1416 Handle result = head_sv->get_obj();
1417 assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1418 if (result() != nullptr) {
1419 return JNIHandles::make_local(THREAD, result());
1420 }
1421 }
1422 }
1423
1424 return nullptr;
1425 JVM_END
1426
1427 JVM_ENTRY_PROF(jboolean, JVM_IsArrayClass, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1428 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1429 return (k != nullptr) && k->is_array_klass() ? true : false;
1430 JVM_END
1431
1432
1433 JVM_ENTRY_PROF(jboolean, JVM_IsPrimitiveClass, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1434 oop mirror = JNIHandles::resolve_non_null(cls);
1435 return (jboolean) java_lang_Class::is_primitive(mirror);
1436 JVM_END
1437
1438
1439 JVM_ENTRY_PROF(jint, JVM_GetClassModifiers, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1440 oop mirror = JNIHandles::resolve_non_null(cls);
1441 if (java_lang_Class::is_primitive(mirror)) {
1442 // Primitive type
1443 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1444 }
1445
1446 Klass* k = java_lang_Class::as_Klass(mirror);
1447 debug_only(int computed_modifiers = k->compute_modifier_flags());
1448 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1449 return k->modifier_flags();
1450 JVM_END
1451
1452
1453 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1454
1455 JVM_ENTRY_PROF(jobjectArray, JVM_GetDeclaredClasses, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1456 JvmtiVMObjectAllocEventCollector oam;
1457 // ofClass is a reference to a java_lang_Class object. The mirror object
1458 // of an InstanceKlass
1459 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1460 if (java_lang_Class::is_primitive(ofMirror) ||
1461 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) {
1462 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1463 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1464 }
1465
1466 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1467 InnerClassesIterator iter(k);
1468
1469 if (iter.length() == 0) {
1470 // Neither an inner nor outer class
1471 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1472 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1473 }
1474
1475 // find inner class info
1476 constantPoolHandle cp(thread, k->constants());
1477 int length = iter.length();
1478
1479 // Allocate temp. result array
1480 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL);
1481 objArrayHandle result (THREAD, r);
1482 int members = 0;
1483
1484 for (; !iter.done(); iter.next()) {
1485 int ioff = iter.inner_class_info_index();
1486 int ooff = iter.outer_class_info_index();
1487
1488 if (ioff != 0 && ooff != 0) {
1489 // Check to see if the name matches the class we're looking for
1490 // before attempting to find the class.
1491 if (cp->klass_name_at_matches(k, ooff)) {
1492 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1493 if (outer_klass == k) {
1494 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1495 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1496
1497 // Throws an exception if outer klass has not declared k as
1498 // an inner klass
1499 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1500
1501 result->obj_at_put(members, inner_klass->java_mirror());
1502 members++;
1503 }
1504 }
1505 }
1506 }
1507
1508 if (members != length) {
1509 // Return array of right length
1510 objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL);
1511 for(int i = 0; i < members; i++) {
1512 res->obj_at_put(i, result->obj_at(i));
1513 }
1514 return (jobjectArray)JNIHandles::make_local(THREAD, res);
1515 }
1516
1517 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1518 JVM_END
1519
1520
1521 JVM_ENTRY_PROF(jclass, JVM_GetDeclaringClass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1522 {
1523 // ofClass is a reference to a java_lang_Class object.
1524 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1525 if (java_lang_Class::is_primitive(ofMirror)) {
1526 return nullptr;
1527 }
1528 Klass* klass = java_lang_Class::as_Klass(ofMirror);
1529 if (!klass->is_instance_klass()) {
1530 return nullptr;
1531 }
1532
1533 bool inner_is_member = false;
1534 Klass* outer_klass
1535 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1536 if (outer_klass == nullptr) return nullptr; // already a top-level class
1537 if (!inner_is_member) return nullptr; // a hidden class (inside a method)
1538 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror());
1539 }
1540 JVM_END
1541
1542 JVM_ENTRY_PROF(jstring, JVM_GetSimpleBinaryName, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1543 {
1544 oop mirror = JNIHandles::resolve_non_null(cls);
1545 if (java_lang_Class::is_primitive(mirror)) {
1546 return nullptr;
1547 }
1548 Klass* klass = java_lang_Class::as_Klass(mirror);
1549 if (!klass->is_instance_klass()) {
1550 return nullptr;
1551 }
1552 InstanceKlass* k = InstanceKlass::cast(klass);
1553 int ooff = 0, noff = 0;
1554 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1555 if (noff != 0) {
1556 constantPoolHandle i_cp(thread, k->constants());
1557 Symbol* name = i_cp->symbol_at(noff);
1558 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1559 return (jstring) JNIHandles::make_local(THREAD, str());
1560 }
1561 }
1562 return nullptr;
1563 }
1564 JVM_END
1565
1566 JVM_ENTRY_PROF(jstring, JVM_GetClassSignature, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1567 assert (cls != nullptr, "illegal class");
1568 JvmtiVMObjectAllocEventCollector oam;
1569 ResourceMark rm(THREAD);
1570 oop mirror = JNIHandles::resolve_non_null(cls);
1571 // Return null for arrays and primitives
1572 if (!java_lang_Class::is_primitive(mirror)) {
1573 Klass* k = java_lang_Class::as_Klass(mirror);
1574 if (k->is_instance_klass()) {
1575 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1576 if (sym == nullptr) return nullptr;
1577 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1578 return (jstring) JNIHandles::make_local(THREAD, str());
1579 }
1580 }
1581 return nullptr;
1582 JVM_END
1583
1584
1585 JVM_ENTRY_PROF(jbyteArray, JVM_GetClassAnnotations, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1586 assert (cls != nullptr, "illegal class");
1587 oop mirror = JNIHandles::resolve_non_null(cls);
1588 // Return null for arrays and primitives
1589 if (!java_lang_Class::is_primitive(mirror)) {
1590 Klass* k = java_lang_Class::as_Klass(mirror);
1591 if (k->is_instance_klass()) {
1592 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1593 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1594 }
1595 }
1596 return nullptr;
1597 JVM_END
1598
1599
1600 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) {
1601 // some of this code was adapted from from jni_FromReflectedField
1602
1603 oop reflected = JNIHandles::resolve_non_null(field);
1604 oop mirror = java_lang_reflect_Field::clazz(reflected);
1605 Klass* k = java_lang_Class::as_Klass(mirror);
1606 int slot = java_lang_reflect_Field::slot(reflected);
1607 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1608
1609 InstanceKlass* ik = InstanceKlass::cast(k);
1610 int offset = ik->field_offset(slot);
1611
1612 if (modifiers & JVM_ACC_STATIC) {
1613 // for static fields we only look in the current class
1614 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1615 assert(false, "cannot find static field");
1616 return false;
1617 }
1618 } else {
1619 // for instance fields we start with the current class and work
1620 // our way up through the superclass chain
1621 if (!ik->find_field_from_offset(offset, false, &fd)) {
1622 assert(false, "cannot find instance field");
1623 return false;
1624 }
1625 }
1626 return true;
1627 }
1628
1629 static Method* jvm_get_method_common(jobject method) {
1630 // some of this code was adapted from from jni_FromReflectedMethod
1631
1632 oop reflected = JNIHandles::resolve_non_null(method);
1633 oop mirror = nullptr;
1634 int slot = 0;
1635
1636 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) {
1637 mirror = java_lang_reflect_Constructor::clazz(reflected);
1638 slot = java_lang_reflect_Constructor::slot(reflected);
1639 } else {
1640 assert(reflected->klass() == vmClasses::reflect_Method_klass(),
1641 "wrong type");
1642 mirror = java_lang_reflect_Method::clazz(reflected);
1643 slot = java_lang_reflect_Method::slot(reflected);
1644 }
1645 Klass* k = java_lang_Class::as_Klass(mirror);
1646
1647 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1648 assert(m != nullptr, "cannot find method");
1649 return m; // caller has to deal with null in product mode
1650 }
1651
1652 /* Type use annotations support (JDK 1.8) */
1653
1654 JVM_ENTRY_PROF(jbyteArray, JVM_GetClassTypeAnnotations, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1655 assert (cls != nullptr, "illegal class");
1656 ResourceMark rm(THREAD);
1657 // Return null for arrays and primitives
1658 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1659 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1660 if (k->is_instance_klass()) {
1661 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1662 if (type_annotations != nullptr) {
1663 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1664 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1665 }
1666 }
1667 }
1668 return nullptr;
1669 JVM_END
1670
1671 JVM_ENTRY_PROF(jbyteArray, JVM_GetMethodTypeAnnotations, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1672 assert (method != nullptr, "illegal method");
1673 // method is a handle to a java.lang.reflect.Method object
1674 Method* m = jvm_get_method_common(method);
1675 if (m == nullptr) {
1676 return nullptr;
1677 }
1678
1679 AnnotationArray* type_annotations = m->type_annotations();
1680 if (type_annotations != nullptr) {
1681 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1682 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1683 }
1684
1685 return nullptr;
1686 JVM_END
1687
1688 JVM_ENTRY_PROF(jbyteArray, JVM_GetFieldTypeAnnotations, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1689 assert (field != nullptr, "illegal field");
1690 fieldDescriptor fd;
1691 bool gotFd = jvm_get_field_common(field, fd);
1692 if (!gotFd) {
1693 return nullptr;
1694 }
1695
1696 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD));
1697 JVM_END
1698
1699 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1700 if (!cp->is_within_bounds(index)) {
1701 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1702 }
1703 }
1704
1705 JVM_ENTRY_PROF(jobjectArray, JVM_GetMethodParameters, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1706 {
1707 // method is a handle to a java.lang.reflect.Method object
1708 Method* method_ptr = jvm_get_method_common(method);
1709 methodHandle mh (THREAD, method_ptr);
1710 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1711 const int num_params = mh->method_parameters_length();
1712
1713 if (num_params < 0) {
1714 // A -1 return value from method_parameters_length means there is no
1715 // parameter data. Return null to indicate this to the reflection
1716 // API.
1717 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1718 return (jobjectArray)nullptr;
1719 } else {
1720 // Otherwise, we return something up to reflection, even if it is
1721 // a zero-length array. Why? Because in some cases this can
1722 // trigger a MalformedParametersException.
1723
1724 // make sure all the symbols are properly formatted
1725 for (int i = 0; i < num_params; i++) {
1726 MethodParametersElement* params = mh->method_parameters_start();
1727 int index = params[i].name_cp_index;
1728 constantPoolHandle cp(THREAD, mh->constants());
1729 bounds_check(cp, index, CHECK_NULL);
1730
1731 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1732 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1733 "Wrong type at constant pool index");
1734 }
1735
1736 }
1737
1738 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL);
1739 objArrayHandle result (THREAD, result_oop);
1740
1741 for (int i = 0; i < num_params; i++) {
1742 MethodParametersElement* params = mh->method_parameters_start();
1743 // For a 0 index, give a null symbol
1744 Symbol* sym = 0 != params[i].name_cp_index ?
1745 mh->constants()->symbol_at(params[i].name_cp_index) : nullptr;
1746 int flags = params[i].flags;
1747 oop param = Reflection::new_parameter(reflected_method, i, sym,
1748 flags, CHECK_NULL);
1749 result->obj_at_put(i, param);
1750 }
1751 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1752 }
1753 }
1754 JVM_END
1755
1756 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1757
1758 JVM_ENTRY_PROF(jobjectArray, JVM_GetClassDeclaredFields, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1759 {
1760 JvmtiVMObjectAllocEventCollector oam;
1761
1762 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1763 // Exclude primitive types and array types
1764 if (java_lang_Class::is_primitive(ofMirror) ||
1765 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1766 // Return empty array
1767 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL);
1768 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1769 }
1770
1771 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1772 constantPoolHandle cp(THREAD, k->constants());
1773
1774 // Ensure class is linked
1775 k->link_class(CHECK_NULL);
1776
1777 // Allocate result
1778 int num_fields;
1779
1780 if (publicOnly) {
1781 num_fields = 0;
1782 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1783 if (fs.access_flags().is_public()) ++num_fields;
1784 }
1785 } else {
1786 num_fields = k->java_fields_count();
1787 }
1788
1789 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL);
1790 objArrayHandle result (THREAD, r);
1791
1792 int out_idx = 0;
1793 fieldDescriptor fd;
1794 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1795 if (!publicOnly || fs.access_flags().is_public()) {
1796 fd.reinitialize(k, fs.index());
1797 oop field = Reflection::new_field(&fd, CHECK_NULL);
1798 result->obj_at_put(out_idx, field);
1799 ++out_idx;
1800 }
1801 }
1802 assert(out_idx == num_fields, "just checking");
1803 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1804 }
1805 JVM_END
1806
1807 // A class is a record if and only if it is final and a direct subclass of
1808 // java.lang.Record and has a Record attribute; otherwise, it is not a record.
1809 JVM_ENTRY_PROF(jboolean, JVM_IsRecord, JVM_IsRecord(JNIEnv *env, jclass cls))
1810 {
1811 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1812 if (k != nullptr && k->is_instance_klass()) {
1813 InstanceKlass* ik = InstanceKlass::cast(k);
1814 return ik->is_record();
1815 } else {
1816 return false;
1817 }
1818 }
1819 JVM_END
1820
1821 // Returns an array containing the components of the Record attribute,
1822 // or null if the attribute is not present.
1823 //
1824 // Note that this function returns the components of the Record attribute
1825 // even if the class is not a record.
1826 JVM_ENTRY_PROF(jobjectArray, JVM_GetRecordComponents, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1827 {
1828 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass));
1829 assert(c->is_instance_klass(), "must be");
1830 InstanceKlass* ik = InstanceKlass::cast(c);
1831
1832 Array<RecordComponent*>* components = ik->record_components();
1833 if (components != nullptr) {
1834 JvmtiVMObjectAllocEventCollector oam;
1835 constantPoolHandle cp(THREAD, ik->constants());
1836 int length = components->length();
1837 assert(length >= 0, "unexpected record_components length");
1838 objArrayOop record_components =
1839 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL);
1840 objArrayHandle components_h (THREAD, record_components);
1841
1842 for (int x = 0; x < length; x++) {
1843 RecordComponent* component = components->at(x);
1844 assert(component != nullptr, "unexpected null record component");
1845 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1846 components_h->obj_at_put(x, component_oop);
1847 }
1848 return (jobjectArray)JNIHandles::make_local(THREAD, components_h());
1849 }
1850
1851 return nullptr;
1852 }
1853 JVM_END
1854
1855 static bool select_method(const methodHandle& method, bool want_constructor) {
1856 if (want_constructor) {
1857 return (method->is_initializer() && !method->is_static());
1858 } else {
1859 return (!method->is_initializer() && !method->is_overpass());
1860 }
1861 }
1862
1863 static jobjectArray get_class_declared_methods_helper(
1864 JNIEnv *env,
1865 jclass ofClass, jboolean publicOnly,
1866 bool want_constructor,
1867 Klass* klass, TRAPS) {
1868
1869 JvmtiVMObjectAllocEventCollector oam;
1870
1871 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1872 // Exclude primitive types and array types
1873 if (java_lang_Class::is_primitive(ofMirror)
1874 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1875 // Return empty array
1876 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1877 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1878 }
1879
1880 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1881
1882 // Ensure class is linked
1883 k->link_class(CHECK_NULL);
1884
1885 Array<Method*>* methods = k->methods();
1886 int methods_length = methods->length();
1887
1888 // Save original method_idnum in case of redefinition, which can change
1889 // the idnum of obsolete methods. The new method will have the same idnum
1890 // but if we refresh the methods array, the counts will be wrong.
1891 ResourceMark rm(THREAD);
1892 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1893 int num_methods = 0;
1894
1895 for (int i = 0; i < methods_length; i++) {
1896 methodHandle method(THREAD, methods->at(i));
1897 if (select_method(method, want_constructor)) {
1898 if (!publicOnly || method->is_public()) {
1899 idnums->push(method->method_idnum());
1900 ++num_methods;
1901 }
1902 }
1903 }
1904
1905 // Allocate result
1906 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1907 objArrayHandle result (THREAD, r);
1908
1909 // Now just put the methods that we selected above, but go by their idnum
1910 // in case of redefinition. The methods can be redefined at any safepoint,
1911 // so above when allocating the oop array and below when creating reflect
1912 // objects.
1913 for (int i = 0; i < num_methods; i++) {
1914 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1915 if (method.is_null()) {
1916 // Method may have been deleted and seems this API can handle null
1917 // Otherwise should probably put a method that throws NSME
1918 result->obj_at_put(i, nullptr);
1919 } else {
1920 oop m;
1921 if (want_constructor) {
1922 m = Reflection::new_constructor(method, CHECK_NULL);
1923 } else {
1924 m = Reflection::new_method(method, false, CHECK_NULL);
1925 }
1926 result->obj_at_put(i, m);
1927 }
1928 }
1929
1930 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1931 }
1932
1933 JVM_ENTRY_PROF(jobjectArray, JVM_GetClassDeclaredMethods, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1934 {
1935 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1936 /*want_constructor*/ false,
1937 vmClasses::reflect_Method_klass(), THREAD);
1938 }
1939 JVM_END
1940
1941 JVM_ENTRY_PROF(jobjectArray, JVM_GetClassDeclaredConstructors, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1942 {
1943 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1944 /*want_constructor*/ true,
1945 vmClasses::reflect_Constructor_klass(), THREAD);
1946 }
1947 JVM_END
1948
1949 JVM_ENTRY_PROF(jint, JVM_GetClassAccessFlags, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1950 {
1951 oop mirror = JNIHandles::resolve_non_null(cls);
1952 if (java_lang_Class::is_primitive(mirror)) {
1953 // Primitive type
1954 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1955 }
1956
1957 Klass* k = java_lang_Class::as_Klass(mirror);
1958 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1959 }
1960 JVM_END
1961
1962 JVM_ENTRY_PROF(jboolean, JVM_AreNestMates, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1963 {
1964 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1965 assert(c->is_instance_klass(), "must be");
1966 InstanceKlass* ck = InstanceKlass::cast(c);
1967 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member));
1968 assert(m->is_instance_klass(), "must be");
1969 InstanceKlass* mk = InstanceKlass::cast(m);
1970 return ck->has_nestmate_access_to(mk, THREAD);
1971 }
1972 JVM_END
1973
1974 JVM_ENTRY_PROF(jclass, JVM_GetNestHost, JVM_GetNestHost(JNIEnv* env, jclass current))
1975 {
1976 // current is not a primitive or array class
1977 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1978 assert(c->is_instance_klass(), "must be");
1979 InstanceKlass* ck = InstanceKlass::cast(c);
1980 InstanceKlass* host = ck->nest_host(THREAD);
1981 return (jclass) (host == nullptr ? nullptr :
1982 JNIHandles::make_local(THREAD, host->java_mirror()));
1983 }
1984 JVM_END
1985
1986 JVM_ENTRY_PROF(jobjectArray, JVM_GetNestMembers, JVM_GetNestMembers(JNIEnv* env, jclass current))
1987 {
1988 // current is not a primitive or array class
1989 ResourceMark rm(THREAD);
1990 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1991 assert(c->is_instance_klass(), "must be");
1992 InstanceKlass* ck = InstanceKlass::cast(c);
1993 InstanceKlass* host = ck->nest_host(THREAD);
1994
1995 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
1996 ck->external_name(), host->external_name());
1997 {
1998 JvmtiVMObjectAllocEventCollector oam;
1999 Array<u2>* members = host->nest_members();
2000 int length = members == nullptr ? 0 : members->length();
2001
2002 log_trace(class, nestmates)(" - host has %d listed nest members", length);
2003
2004 // nest host is first in the array so make it one bigger
2005 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
2006 length + 1, CHECK_NULL);
2007 objArrayHandle result(THREAD, r);
2008 result->obj_at_put(0, host->java_mirror());
2009 if (length != 0) {
2010 int count = 0;
2011 for (int i = 0; i < length; i++) {
2012 int cp_index = members->at(i);
2013 Klass* k = host->constants()->klass_at(cp_index, THREAD);
2014 if (HAS_PENDING_EXCEPTION) {
2015 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2016 return nullptr; // propagate VMEs
2017 }
2018 if (log_is_enabled(Trace, class, nestmates)) {
2019 stringStream ss;
2020 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
2021 ss.print(" - resolution of nest member %s failed: ", target_member_class);
2022 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2023 log_trace(class, nestmates)("%s", ss.as_string());
2024 }
2025 CLEAR_PENDING_EXCEPTION;
2026 continue;
2027 }
2028 if (k->is_instance_klass()) {
2029 InstanceKlass* ik = InstanceKlass::cast(k);
2030 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
2031 if (nest_host_k == host) {
2032 result->obj_at_put(count+1, k->java_mirror());
2033 count++;
2034 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
2035 } else {
2036 log_trace(class, nestmates)(" - skipping member %s with different host %s",
2037 ik->external_name(), nest_host_k->external_name());
2038 }
2039 } else {
2040 log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
2041 k->external_name());
2042 }
2043 }
2044 if (count < length) {
2045 // we had invalid entries so we need to compact the array
2046 log_trace(class, nestmates)(" - compacting array from length %d to %d",
2047 length + 1, count + 1);
2048
2049 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2050 count + 1, CHECK_NULL);
2051 objArrayHandle result2(THREAD, r2);
2052 for (int i = 0; i < count + 1; i++) {
2053 result2->obj_at_put(i, result->obj_at(i));
2054 }
2055 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2056 }
2057 }
2058 else {
2059 assert(host == ck || ck->is_hidden(), "must be singleton nest or dynamic nestmate");
2060 }
2061 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2062 }
2063 }
2064 JVM_END
2065
2066 JVM_ENTRY_PROF(jobjectArray, JVM_GetPermittedSubclasses, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
2067 {
2068 oop mirror = JNIHandles::resolve_non_null(current);
2069 assert(!java_lang_Class::is_primitive(mirror), "should not be");
2070 Klass* c = java_lang_Class::as_Klass(mirror);
2071 assert(c->is_instance_klass(), "must be");
2072 InstanceKlass* ik = InstanceKlass::cast(c);
2073 ResourceMark rm(THREAD);
2074 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s",
2075 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name());
2076 if (ik->is_sealed()) {
2077 JvmtiVMObjectAllocEventCollector oam;
2078 Array<u2>* subclasses = ik->permitted_subclasses();
2079 int length = subclasses->length();
2080
2081 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length);
2082
2083 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
2084 length, CHECK_NULL);
2085 objArrayHandle result(THREAD, r);
2086 int count = 0;
2087 for (int i = 0; i < length; i++) {
2088 int cp_index = subclasses->at(i);
2089 Klass* k = ik->constants()->klass_at(cp_index, THREAD);
2090 if (HAS_PENDING_EXCEPTION) {
2091 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2092 return nullptr; // propagate VMEs
2093 }
2094 if (log_is_enabled(Trace, class, sealed)) {
2095 stringStream ss;
2096 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string();
2097 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass);
2098 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2099 log_trace(class, sealed)("%s", ss.as_string());
2100 }
2101
2102 CLEAR_PENDING_EXCEPTION;
2103 continue;
2104 }
2105 if (k->is_instance_klass()) {
2106 result->obj_at_put(count++, k->java_mirror());
2107 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name());
2108 }
2109 }
2110 if (count < length) {
2111 // we had invalid entries so we need to compact the array
2112 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2113 count, CHECK_NULL);
2114 objArrayHandle result2(THREAD, r2);
2115 for (int i = 0; i < count; i++) {
2116 result2->obj_at_put(i, result->obj_at(i));
2117 }
2118 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2119 }
2120 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2121 } else {
2122 return nullptr;
2123 }
2124 }
2125 JVM_END
2126
2127 // Constant pool access //////////////////////////////////////////////////////////
2128
2129 JVM_ENTRY_PROF(jobject, JVM_GetClassConstantPool, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2130 {
2131 JvmtiVMObjectAllocEventCollector oam;
2132 oop mirror = JNIHandles::resolve_non_null(cls);
2133 // Return null for primitives and arrays
2134 if (!java_lang_Class::is_primitive(mirror)) {
2135 Klass* k = java_lang_Class::as_Klass(mirror);
2136 if (k->is_instance_klass()) {
2137 InstanceKlass* k_h = InstanceKlass::cast(k);
2138 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2139 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2140 return JNIHandles::make_local(THREAD, jcp());
2141 }
2142 }
2143 return nullptr;
2144 }
2145 JVM_END
2146
2147
2148 JVM_ENTRY_PROF(jint, JVM_ConstantPoolGetSize, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
2149 {
2150 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2151 return cp->length();
2152 }
2153 JVM_END
2154
2155
2156 JVM_ENTRY_PROF(jclass, JVM_ConstantPoolGetClassAt, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2157 {
2158 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2159 bounds_check(cp, index, CHECK_NULL);
2160 constantTag tag = cp->tag_at(index);
2161 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2162 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2163 }
2164 Klass* k = cp->klass_at(index, CHECK_NULL);
2165 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2166 }
2167 JVM_END
2168
2169 JVM_ENTRY_PROF(jclass, JVM_ConstantPoolGetClassAtIfLoaded, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2170 {
2171 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2172 bounds_check(cp, index, CHECK_NULL);
2173 constantTag tag = cp->tag_at(index);
2174 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2175 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2176 }
2177 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2178 if (k == nullptr) return nullptr;
2179 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2180 }
2181 JVM_END
2182
2183 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2184 constantTag tag = cp->tag_at(index);
2185 if (!tag.is_method() && !tag.is_interface_method()) {
2186 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2187 }
2188 int klass_ref = cp->uncached_klass_ref_index_at(index);
2189 Klass* k_o;
2190 if (force_resolution) {
2191 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2192 } else {
2193 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2194 if (k_o == nullptr) return nullptr;
2195 }
2196 InstanceKlass* k = InstanceKlass::cast(k_o);
2197 Symbol* name = cp->uncached_name_ref_at(index);
2198 Symbol* sig = cp->uncached_signature_ref_at(index);
2199 methodHandle m (THREAD, k->find_method(name, sig));
2200 if (m.is_null()) {
2201 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2202 }
2203 oop method;
2204 if (!m->is_initializer() || m->is_static()) {
2205 method = Reflection::new_method(m, true, CHECK_NULL);
2206 } else {
2207 method = Reflection::new_constructor(m, CHECK_NULL);
2208 }
2209 return JNIHandles::make_local(THREAD, method);
2210 }
2211
2212 JVM_ENTRY_PROF(jobject, JVM_ConstantPoolGetMethodAt, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2213 {
2214 JvmtiVMObjectAllocEventCollector oam;
2215 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2216 bounds_check(cp, index, CHECK_NULL);
2217 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2218 return res;
2219 }
2220 JVM_END
2221
2222 JVM_ENTRY_PROF(jobject, JVM_ConstantPoolGetMethodAtIfLoaded, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2223 {
2224 JvmtiVMObjectAllocEventCollector oam;
2225 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2226 bounds_check(cp, index, CHECK_NULL);
2227 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2228 return res;
2229 }
2230 JVM_END
2231
2232 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2233 constantTag tag = cp->tag_at(index);
2234 if (!tag.is_field()) {
2235 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2236 }
2237 int klass_ref = cp->uncached_klass_ref_index_at(index);
2238 Klass* k_o;
2239 if (force_resolution) {
2240 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2241 } else {
2242 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2243 if (k_o == nullptr) return nullptr;
2244 }
2245 InstanceKlass* k = InstanceKlass::cast(k_o);
2246 Symbol* name = cp->uncached_name_ref_at(index);
2247 Symbol* sig = cp->uncached_signature_ref_at(index);
2248 fieldDescriptor fd;
2249 Klass* target_klass = k->find_field(name, sig, &fd);
2250 if (target_klass == nullptr) {
2251 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2252 }
2253 oop field = Reflection::new_field(&fd, CHECK_NULL);
2254 return JNIHandles::make_local(THREAD, field);
2255 }
2256
2257 JVM_ENTRY_PROF(jobject, JVM_ConstantPoolGetFieldAt, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2258 {
2259 JvmtiVMObjectAllocEventCollector oam;
2260 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2261 bounds_check(cp, index, CHECK_NULL);
2262 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2263 return res;
2264 }
2265 JVM_END
2266
2267 JVM_ENTRY_PROF(jobject, JVM_ConstantPoolGetFieldAtIfLoaded, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2268 {
2269 JvmtiVMObjectAllocEventCollector oam;
2270 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2271 bounds_check(cp, index, CHECK_NULL);
2272 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2273 return res;
2274 }
2275 JVM_END
2276
2277 JVM_ENTRY_PROF(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2278 {
2279 JvmtiVMObjectAllocEventCollector oam;
2280 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2281 bounds_check(cp, index, CHECK_NULL);
2282 constantTag tag = cp->tag_at(index);
2283 if (!tag.is_field_or_method()) {
2284 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2285 }
2286 int klass_ref = cp->uncached_klass_ref_index_at(index);
2287 Symbol* klass_name = cp->klass_name_at(klass_ref);
2288 Symbol* member_name = cp->uncached_name_ref_at(index);
2289 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2290 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL);
2291 objArrayHandle dest(THREAD, dest_o);
2292 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2293 dest->obj_at_put(0, str());
2294 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2295 dest->obj_at_put(1, str());
2296 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2297 dest->obj_at_put(2, str());
2298 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2299 }
2300 JVM_END
2301
2302 JVM_ENTRY_PROF(jint, JVM_ConstantPoolGetClassRefIndexAt, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2303 {
2304 JvmtiVMObjectAllocEventCollector oam;
2305 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2306 bounds_check(cp, index, CHECK_0);
2307 constantTag tag = cp->tag_at(index);
2308 if (!tag.is_field_or_method()) {
2309 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2310 }
2311 return (jint) cp->uncached_klass_ref_index_at(index);
2312 }
2313 JVM_END
2314
2315 JVM_ENTRY_PROF(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2316 {
2317 JvmtiVMObjectAllocEventCollector oam;
2318 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2319 bounds_check(cp, index, CHECK_0);
2320 constantTag tag = cp->tag_at(index);
2321 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2322 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2323 }
2324 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2325 }
2326 JVM_END
2327
2328 JVM_ENTRY_PROF(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2329 {
2330 JvmtiVMObjectAllocEventCollector oam;
2331 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2332 bounds_check(cp, index, CHECK_NULL);
2333 constantTag tag = cp->tag_at(index);
2334 if (!tag.is_name_and_type()) {
2335 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2336 }
2337 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2338 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2339 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL);
2340 objArrayHandle dest(THREAD, dest_o);
2341 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2342 dest->obj_at_put(0, str());
2343 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2344 dest->obj_at_put(1, str());
2345 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2346 }
2347 JVM_END
2348
2349 JVM_ENTRY_PROF(jint, JVM_ConstantPoolGetIntAt, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2350 {
2351 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2352 bounds_check(cp, index, CHECK_0);
2353 constantTag tag = cp->tag_at(index);
2354 if (!tag.is_int()) {
2355 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2356 }
2357 return cp->int_at(index);
2358 }
2359 JVM_END
2360
2361 JVM_ENTRY_PROF(jlong, JVM_ConstantPoolGetLongAt, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2362 {
2363 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2364 bounds_check(cp, index, CHECK_(0L));
2365 constantTag tag = cp->tag_at(index);
2366 if (!tag.is_long()) {
2367 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2368 }
2369 return cp->long_at(index);
2370 }
2371 JVM_END
2372
2373 JVM_ENTRY_PROF(jfloat, JVM_ConstantPoolGetFloatAt, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2374 {
2375 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2376 bounds_check(cp, index, CHECK_(0.0f));
2377 constantTag tag = cp->tag_at(index);
2378 if (!tag.is_float()) {
2379 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2380 }
2381 return cp->float_at(index);
2382 }
2383 JVM_END
2384
2385 JVM_ENTRY_PROF(jdouble, JVM_ConstantPoolGetDoubleAt, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2386 {
2387 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2388 bounds_check(cp, index, CHECK_(0.0));
2389 constantTag tag = cp->tag_at(index);
2390 if (!tag.is_double()) {
2391 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2392 }
2393 return cp->double_at(index);
2394 }
2395 JVM_END
2396
2397 JVM_ENTRY_PROF(jstring, JVM_ConstantPoolGetStringAt, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2398 {
2399 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2400 bounds_check(cp, index, CHECK_NULL);
2401 constantTag tag = cp->tag_at(index);
2402 if (!tag.is_string()) {
2403 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2404 }
2405 oop str = cp->string_at(index, CHECK_NULL);
2406 return (jstring) JNIHandles::make_local(THREAD, str);
2407 }
2408 JVM_END
2409
2410 JVM_ENTRY_PROF(jstring, JVM_ConstantPoolGetUTF8At, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2411 {
2412 JvmtiVMObjectAllocEventCollector oam;
2413 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2414 bounds_check(cp, index, CHECK_NULL);
2415 constantTag tag = cp->tag_at(index);
2416 if (!tag.is_symbol()) {
2417 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2418 }
2419 Symbol* sym = cp->symbol_at(index);
2420 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2421 return (jstring) JNIHandles::make_local(THREAD, str());
2422 }
2423 JVM_END
2424
2425 JVM_ENTRY_PROF(jbyte, JVM_ConstantPoolGetTagAt, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2426 {
2427 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2428 bounds_check(cp, index, CHECK_0);
2429 constantTag tag = cp->tag_at(index);
2430 jbyte result = tag.value();
2431 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2432 // they are changed to the corresponding tags from the JVM spec, so that java code in
2433 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2434 if (tag.is_klass_or_reference()) {
2435 result = JVM_CONSTANT_Class;
2436 } else if (tag.is_string_index()) {
2437 result = JVM_CONSTANT_String;
2438 } else if (tag.is_method_type_in_error()) {
2439 result = JVM_CONSTANT_MethodType;
2440 } else if (tag.is_method_handle_in_error()) {
2441 result = JVM_CONSTANT_MethodHandle;
2442 } else if (tag.is_dynamic_constant_in_error()) {
2443 result = JVM_CONSTANT_Dynamic;
2444 }
2445 return result;
2446 }
2447 JVM_END
2448
2449 // Assertion support. //////////////////////////////////////////////////////////
2450
2451 JVM_ENTRY_PROF(jboolean, JVM_DesiredAssertionStatus, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2452 assert(cls != nullptr, "bad class");
2453
2454 oop r = JNIHandles::resolve(cls);
2455 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2456 if (java_lang_Class::is_primitive(r)) return false;
2457
2458 Klass* k = java_lang_Class::as_Klass(r);
2459 assert(k->is_instance_klass(), "must be an instance klass");
2460 if (!k->is_instance_klass()) return false;
2461
2462 ResourceMark rm(THREAD);
2463 const char* name = k->name()->as_C_string();
2464 bool system_class = k->class_loader() == nullptr;
2465 return JavaAssertions::enabled(name, system_class);
2466
2467 JVM_END
2468
2469
2470 // Return a new AssertionStatusDirectives object with the fields filled in with
2471 // command-line assertion arguments (i.e., -ea, -da).
2472 JVM_ENTRY_PROF(jobject, JVM_AssertionStatusDirectives, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2473 JvmtiVMObjectAllocEventCollector oam;
2474 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2475 return JNIHandles::make_local(THREAD, asd);
2476 JVM_END
2477
2478 // Verification ////////////////////////////////////////////////////////////////////////////////
2479
2480 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2481
2482 // RedefineClasses support: bug 6214132 caused verification to fail.
2483 // All functions from this section should call the jvmtiThreadSate function:
2484 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2485 // The function returns a Klass* of the _scratch_class if the verifier
2486 // was invoked in the middle of the class redefinition.
2487 // Otherwise it returns its argument value which is the _the_class Klass*.
2488 // Please, refer to the description in the jvmtiThreadSate.hpp.
2489
2490 JVM_ENTRY_PROF(const char*, JVM_GetClassNameUTF, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2491 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2492 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2493 return k->name()->as_utf8();
2494 JVM_END
2495
2496
2497 JVM_ENTRY_PROF(void, JVM_GetClassCPTypes, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2498 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2499 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2500 // types will have length zero if this is not an InstanceKlass
2501 // (length is determined by call to JVM_GetClassCPEntriesCount)
2502 if (k->is_instance_klass()) {
2503 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2504 for (int index = cp->length() - 1; index >= 0; index--) {
2505 constantTag tag = cp->tag_at(index);
2506 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2507 }
2508 }
2509 JVM_END
2510
2511
2512 JVM_ENTRY_PROF(jint, JVM_GetClassCPEntriesCount, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2513 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2514 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2515 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2516 JVM_END
2517
2518
2519 JVM_ENTRY_PROF(jint, JVM_GetClassFieldsCount, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2520 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2521 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2522 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2523 JVM_END
2524
2525
2526 JVM_ENTRY_PROF(jint, JVM_GetClassMethodsCount, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2527 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2528 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2529 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2530 JVM_END
2531
2532
2533 // The following methods, used for the verifier, are never called with
2534 // array klasses, so a direct cast to InstanceKlass is safe.
2535 // Typically, these methods are called in a loop with bounds determined
2536 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2537 // zero for arrays.
2538 JVM_ENTRY_PROF(void, JVM_GetMethodIxExceptionIndexes, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2539 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2540 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2541 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2542 int length = method->checked_exceptions_length();
2543 if (length > 0) {
2544 CheckedExceptionElement* table= method->checked_exceptions_start();
2545 for (int i = 0; i < length; i++) {
2546 exceptions[i] = table[i].class_cp_index;
2547 }
2548 }
2549 JVM_END
2550
2551
2552 JVM_ENTRY_PROF(jint, JVM_GetMethodIxExceptionsCount, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2553 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2554 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2555 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2556 return method->checked_exceptions_length();
2557 JVM_END
2558
2559
2560 JVM_ENTRY_PROF(void, JVM_GetMethodIxByteCode, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2561 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2562 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2563 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2564 memcpy(code, method->code_base(), method->code_size());
2565 JVM_END
2566
2567
2568 JVM_ENTRY_PROF(jint, JVM_GetMethodIxByteCodeLength, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2569 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2570 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2571 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2572 return method->code_size();
2573 JVM_END
2574
2575
2576 JVM_ENTRY_PROF(void, JVM_GetMethodIxExceptionTableEntry, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2577 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2578 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2579 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2580 ExceptionTable extable(method);
2581 entry->start_pc = extable.start_pc(entry_index);
2582 entry->end_pc = extable.end_pc(entry_index);
2583 entry->handler_pc = extable.handler_pc(entry_index);
2584 entry->catchType = extable.catch_type_index(entry_index);
2585 JVM_END
2586
2587
2588 JVM_ENTRY_PROF(jint, JVM_GetMethodIxExceptionTableLength, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2589 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2590 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2591 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2592 return method->exception_table_length();
2593 JVM_END
2594
2595
2596 JVM_ENTRY_PROF(jint, JVM_GetMethodIxModifiers, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2597 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2598 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2599 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2600 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2601 JVM_END
2602
2603
2604 JVM_ENTRY_PROF(jint, JVM_GetFieldIxModifiers, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2605 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2606 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2607 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2608 JVM_END
2609
2610
2611 JVM_ENTRY_PROF(jint, JVM_GetMethodIxLocalsCount, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2612 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2613 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2614 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2615 return method->max_locals();
2616 JVM_END
2617
2618
2619 JVM_ENTRY_PROF(jint, JVM_GetMethodIxArgsSize, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2620 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2621 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2622 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2623 return method->size_of_parameters();
2624 JVM_END
2625
2626
2627 JVM_ENTRY_PROF(jint, JVM_GetMethodIxMaxStack, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2628 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2629 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2630 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2631 return method->verifier_max_stack();
2632 JVM_END
2633
2634
2635 JVM_ENTRY_PROF(jboolean, JVM_IsConstructorIx, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2636 ResourceMark rm(THREAD);
2637 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2638 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2639 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2640 return method->name() == vmSymbols::object_initializer_name();
2641 JVM_END
2642
2643
2644 JVM_ENTRY_PROF(jboolean, JVM_IsVMGeneratedMethodIx, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2645 ResourceMark rm(THREAD);
2646 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2647 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2648 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2649 return method->is_overpass();
2650 JVM_END
2651
2652 JVM_ENTRY_PROF(const char*, JVM_GetMethodIxNameUTF, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2653 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2654 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2655 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2656 return method->name()->as_utf8();
2657 JVM_END
2658
2659
2660 JVM_ENTRY_PROF(const char*, JVM_GetMethodIxSignatureUTF, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2661 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2662 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2663 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2664 return method->signature()->as_utf8();
2665 JVM_END
2666
2667 /**
2668 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2669 * read entries in the constant pool. Since the old verifier always
2670 * works on a copy of the code, it will not see any rewriting that
2671 * may possibly occur in the middle of verification. So it is important
2672 * that nothing it calls tries to use the cpCache instead of the raw
2673 * constant pool, so we must use cp->uncached_x methods when appropriate.
2674 */
2675 JVM_ENTRY_PROF(const char*, JVM_GetCPFieldNameUTF, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2676 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2677 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2678 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2679 switch (cp->tag_at(cp_index).value()) {
2680 case JVM_CONSTANT_Fieldref:
2681 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2682 default:
2683 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2684 }
2685 ShouldNotReachHere();
2686 return nullptr;
2687 JVM_END
2688
2689
2690 JVM_ENTRY_PROF(const char*, JVM_GetCPMethodNameUTF, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2691 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2692 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2693 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2694 switch (cp->tag_at(cp_index).value()) {
2695 case JVM_CONSTANT_InterfaceMethodref:
2696 case JVM_CONSTANT_Methodref:
2697 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2698 default:
2699 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2700 }
2701 ShouldNotReachHere();
2702 return nullptr;
2703 JVM_END
2704
2705
2706 JVM_ENTRY_PROF(const char*, JVM_GetCPMethodSignatureUTF, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2707 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2708 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2709 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2710 switch (cp->tag_at(cp_index).value()) {
2711 case JVM_CONSTANT_InterfaceMethodref:
2712 case JVM_CONSTANT_Methodref:
2713 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2714 default:
2715 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2716 }
2717 ShouldNotReachHere();
2718 return nullptr;
2719 JVM_END
2720
2721
2722 JVM_ENTRY_PROF(const char*, JVM_GetCPFieldSignatureUTF, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2723 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2724 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2725 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2726 switch (cp->tag_at(cp_index).value()) {
2727 case JVM_CONSTANT_Fieldref:
2728 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2729 default:
2730 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2731 }
2732 ShouldNotReachHere();
2733 return nullptr;
2734 JVM_END
2735
2736
2737 JVM_ENTRY_PROF(const char*, JVM_GetCPClassNameUTF, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2738 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2739 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2740 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2741 Symbol* classname = cp->klass_name_at(cp_index);
2742 return classname->as_utf8();
2743 JVM_END
2744
2745
2746 JVM_ENTRY_PROF(const char*, JVM_GetCPFieldClassNameUTF, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2747 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2748 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2749 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2750 switch (cp->tag_at(cp_index).value()) {
2751 case JVM_CONSTANT_Fieldref: {
2752 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2753 Symbol* classname = cp->klass_name_at(class_index);
2754 return classname->as_utf8();
2755 }
2756 default:
2757 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2758 }
2759 ShouldNotReachHere();
2760 return nullptr;
2761 JVM_END
2762
2763
2764 JVM_ENTRY_PROF(const char*, JVM_GetCPMethodClassNameUTF, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2765 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2766 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2767 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2768 switch (cp->tag_at(cp_index).value()) {
2769 case JVM_CONSTANT_Methodref:
2770 case JVM_CONSTANT_InterfaceMethodref: {
2771 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2772 Symbol* classname = cp->klass_name_at(class_index);
2773 return classname->as_utf8();
2774 }
2775 default:
2776 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2777 }
2778 ShouldNotReachHere();
2779 return nullptr;
2780 JVM_END
2781
2782
2783 JVM_ENTRY_PROF(jint, JVM_GetCPFieldModifiers, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2784 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2785 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2786 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2787 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2788 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2789 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2790 switch (cp->tag_at(cp_index).value()) {
2791 case JVM_CONSTANT_Fieldref: {
2792 Symbol* name = cp->uncached_name_ref_at(cp_index);
2793 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2794 InstanceKlass* ik = InstanceKlass::cast(k_called);
2795 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2796 if (fs.name() == name && fs.signature() == signature) {
2797 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2798 }
2799 }
2800 return -1;
2801 }
2802 default:
2803 fatal("JVM_GetCPFieldModifiers: illegal constant");
2804 }
2805 ShouldNotReachHere();
2806 return 0;
2807 JVM_END
2808
2809
2810 JVM_ENTRY_PROF(jint, JVM_GetCPMethodModifiers, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2811 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2812 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2813 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2814 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2815 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2816 switch (cp->tag_at(cp_index).value()) {
2817 case JVM_CONSTANT_Methodref:
2818 case JVM_CONSTANT_InterfaceMethodref: {
2819 Symbol* name = cp->uncached_name_ref_at(cp_index);
2820 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2821 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2822 int methods_count = methods->length();
2823 for (int i = 0; i < methods_count; i++) {
2824 Method* method = methods->at(i);
2825 if (method->name() == name && method->signature() == signature) {
2826 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2827 }
2828 }
2829 return -1;
2830 }
2831 default:
2832 fatal("JVM_GetCPMethodModifiers: illegal constant");
2833 }
2834 ShouldNotReachHere();
2835 return 0;
2836 JVM_END
2837
2838
2839 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2840
2841 JVM_LEAF_PROF(void, JVM_ReleaseUTF, JVM_ReleaseUTF(const char *utf))
2842 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2843 JVM_END
2844
2845
2846 JVM_ENTRY_PROF(jboolean, JVM_IsSameClassPackage, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2847 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2848 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2849 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2850 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2851 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2852 JVM_END
2853
2854 // Printing support //////////////////////////////////////////////////
2855 extern "C" {
2856
2857 ATTRIBUTE_PRINTF(3, 0)
2858 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2859 // Reject count values that are negative signed values converted to
2860 // unsigned; see bug 4399518, 4417214
2861 if ((intptr_t)count <= 0) return -1;
2862
2863 int result = os::vsnprintf(str, count, fmt, args);
2864 if (result > 0 && (size_t)result >= count) {
2865 result = -1;
2866 }
2867
2868 return result;
2869 }
2870
2871 ATTRIBUTE_PRINTF(3, 4)
2872 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2873 va_list args;
2874 int len;
2875 va_start(args, fmt);
2876 len = jio_vsnprintf(str, count, fmt, args);
2877 va_end(args);
2878 return len;
2879 }
2880
2881 ATTRIBUTE_PRINTF(2, 3)
2882 int jio_fprintf(FILE* f, const char *fmt, ...) {
2883 int len;
2884 va_list args;
2885 va_start(args, fmt);
2886 len = jio_vfprintf(f, fmt, args);
2887 va_end(args);
2888 return len;
2889 }
2890
2891 ATTRIBUTE_PRINTF(2, 0)
2892 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2893 if (Arguments::vfprintf_hook() != nullptr) {
2894 return Arguments::vfprintf_hook()(f, fmt, args);
2895 } else {
2896 return vfprintf(f, fmt, args);
2897 }
2898 }
2899
2900 ATTRIBUTE_PRINTF(1, 2)
2901 JNIEXPORT int jio_printf(const char *fmt, ...) {
2902 int len;
2903 va_list args;
2904 va_start(args, fmt);
2905 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2906 va_end(args);
2907 return len;
2908 }
2909
2910 // HotSpot specific jio method
2911 void jio_print(const char* s, size_t len) {
2912 // Try to make this function as atomic as possible.
2913 if (Arguments::vfprintf_hook() != nullptr) {
2914 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2915 } else {
2916 // Make an unused local variable to avoid warning from gcc compiler.
2917 bool dummy = os::write(defaultStream::output_fd(), s, len);
2918 }
2919 }
2920
2921 } // Extern C
2922
2923 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2924
2925 // In most of the JVM thread support functions we need to access the
2926 // thread through a ThreadsListHandle to prevent it from exiting and
2927 // being reclaimed while we try to operate on it. The exceptions to this
2928 // rule are when operating on the current thread, or if the monitor of
2929 // the target java.lang.Thread is locked at the Java level - in both
2930 // cases the target cannot exit.
2931
2932 static void thread_entry(JavaThread* thread, TRAPS) {
2933 HandleMark hm(THREAD);
2934 Handle obj(THREAD, thread->threadObj());
2935 JavaValue result(T_VOID);
2936 JavaCalls::call_virtual(&result,
2937 obj,
2938 vmClasses::Thread_klass(),
2939 vmSymbols::run_method_name(),
2940 vmSymbols::void_method_signature(),
2941 THREAD);
2942 }
2943
2944
2945 JVM_ENTRY_PROF(void, JVM_StartThread, JVM_StartThread(JNIEnv* env, jobject jthread))
2946 #if INCLUDE_CDS
2947 if (CDSConfig::is_dumping_classic_static_archive()) {
2948 // During java -Xshare:dump, if we allow multiple Java threads to
2949 // execute in parallel, symbols and classes may be loaded in
2950 // random orders which will make the resulting CDS archive
2951 // non-deterministic.
2952 //
2953 // Lucikly, during java -Xshare:dump, it's important to run only
2954 // the code in the main Java thread (which is NOT started here) that
2955 // creates the module graph, etc. It's safe to not start the other
2956 // threads which are launched by class static initializers
2957 // (ReferenceHandler, FinalizerThread and CleanerImpl).
2958 if (log_is_enabled(Info, cds)) {
2959 ResourceMark rm;
2960 oop t = JNIHandles::resolve_non_null(jthread);
2961 log_info(cds)("JVM_StartThread() ignored: %s", t->klass()->external_name());
2962 }
2963 return;
2964 }
2965 #endif
2966 JavaThread *native_thread = nullptr;
2967
2968 // We cannot hold the Threads_lock when we throw an exception,
2969 // due to rank ordering issues. Example: we might need to grab the
2970 // Heap_lock while we construct the exception.
2971 bool throw_illegal_thread_state = false;
2972
2973 // We must release the Threads_lock before we can post a jvmti event
2974 // in Thread::start.
2975 {
2976 // Ensure that the C++ Thread and OSThread structures aren't freed before
2977 // we operate.
2978 MutexLocker mu(Threads_lock);
2979
2980 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2981 // re-starting an already started thread, so we should usually find
2982 // that the JavaThread is null. However for a JNI attached thread
2983 // there is a small window between the Thread object being created
2984 // (with its JavaThread set) and the update to its threadStatus, so we
2985 // have to check for this
2986 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) {
2987 throw_illegal_thread_state = true;
2988 } else {
2989 jlong size =
2990 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2991 // Allocate the C++ Thread structure and create the native thread. The
2992 // stack size retrieved from java is 64-bit signed, but the constructor takes
2993 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2994 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2995 // - Avoid passing negative values which would result in really large stacks.
2996 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2997 size_t sz = size > 0 ? (size_t) size : 0;
2998 native_thread = new JavaThread(&thread_entry, sz);
2999
3000 // At this point it may be possible that no osthread was created for the
3001 // JavaThread due to lack of memory. Check for this situation and throw
3002 // an exception if necessary. Eventually we may want to change this so
3003 // that we only grab the lock if the thread was created successfully -
3004 // then we can also do this check and throw the exception in the
3005 // JavaThread constructor.
3006 if (native_thread->osthread() != nullptr) {
3007 // Note: the current thread is not being used within "prepare".
3008 native_thread->prepare(jthread);
3009 }
3010 }
3011 }
3012
3013 if (throw_illegal_thread_state) {
3014 THROW(vmSymbols::java_lang_IllegalThreadStateException());
3015 }
3016
3017 assert(native_thread != nullptr, "Starting null thread?");
3018
3019 if (native_thread->osthread() == nullptr) {
3020 ResourceMark rm(thread);
3021 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"",
3022 JavaThread::name_for(JNIHandles::resolve_non_null(jthread)));
3023 // No one should hold a reference to the 'native_thread'.
3024 native_thread->smr_delete();
3025 if (JvmtiExport::should_post_resource_exhausted()) {
3026 JvmtiExport::post_resource_exhausted(
3027 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
3028 os::native_thread_creation_failed_msg());
3029 }
3030 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
3031 os::native_thread_creation_failed_msg());
3032 }
3033
3034 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);)
3035
3036 Thread::start(native_thread);
3037
3038 JVM_END
3039
3040
3041 JVM_ENTRY_PROF(void, JVM_SetThreadPriority, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
3042 ThreadsListHandle tlh(thread);
3043 oop java_thread = nullptr;
3044 JavaThread* receiver = nullptr;
3045 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3046 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3047
3048 if (is_alive) {
3049 // jthread refers to a live JavaThread.
3050 Thread::set_priority(receiver, (ThreadPriority)prio);
3051 }
3052 // Implied else: If the JavaThread hasn't started yet, then the
3053 // priority set in the java.lang.Thread object above will be pushed
3054 // down when it does start.
3055 JVM_END
3056
3057
3058 JVM_LEAF_PROF(void, JVM_Yield, JVM_Yield(JNIEnv *env, jclass threadClass))
3059 if (os::dont_yield()) return;
3060 HOTSPOT_THREAD_YIELD();
3061 os::naked_yield();
3062 JVM_END
3063
3064 JVM_ENTRY_PROF(void, JVM_SleepNanos, JVM_SleepNanos(JNIEnv* env, jclass threadClass, jlong nanos))
3065 if (nanos < 0) {
3066 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range");
3067 }
3068
3069 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
3070 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3071 }
3072
3073 // Save current thread state and restore it at the end of this block.
3074 // And set new thread state to SLEEPING.
3075 JavaThreadSleepState jtss(thread);
3076
3077 HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC);
3078
3079 if (nanos == 0) {
3080 os::naked_yield();
3081 } else {
3082 ThreadState old_state = thread->osthread()->get_state();
3083 thread->osthread()->set_state(SLEEPING);
3084 if (!thread->sleep_nanos(nanos)) { // interrupted
3085 // An asynchronous exception could have been thrown on
3086 // us while we were sleeping. We do not overwrite those.
3087 if (!HAS_PENDING_EXCEPTION) {
3088 HOTSPOT_THREAD_SLEEP_END(1);
3089
3090 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3091 // to properly restore the thread state. That's likely wrong.
3092 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3093 }
3094 }
3095 thread->osthread()->set_state(old_state);
3096 }
3097 HOTSPOT_THREAD_SLEEP_END(0);
3098 JVM_END
3099
3100 JVM_ENTRY_PROF(jobject, JVM_CurrentCarrierThread, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass))
3101 oop jthread = thread->threadObj();
3102 assert(jthread != nullptr, "no current carrier thread!");
3103 return JNIHandles::make_local(THREAD, jthread);
3104 JVM_END
3105
3106 JVM_ENTRY_PROF(jobject, JVM_CurrentThread, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3107 oop theThread = thread->vthread();
3108 assert(theThread != (oop)nullptr, "no current thread!");
3109 return JNIHandles::make_local(THREAD, theThread);
3110 JVM_END
3111
3112 JVM_ENTRY_PROF(void, JVM_SetCurrentThread, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread,
3113 jobject theThread))
3114 oop threadObj = JNIHandles::resolve(theThread);
3115 thread->set_vthread(threadObj);
3116 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);)
3117 JVM_END
3118
3119 JVM_ENTRY_PROF(jlong, JVM_GetNextThreadIdOffset, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass))
3120 return ThreadIdentifier::unsafe_offset();
3121 JVM_END
3122
3123 JVM_ENTRY_PROF(void, JVM_Interrupt, JVM_Interrupt(JNIEnv* env, jobject jthread))
3124 ThreadsListHandle tlh(thread);
3125 JavaThread* receiver = nullptr;
3126 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr);
3127 if (is_alive) {
3128 // jthread refers to a live JavaThread.
3129 receiver->interrupt();
3130 }
3131 JVM_END
3132
3133 // Return true iff the current thread has locked the object passed in
3134
3135 JVM_ENTRY_PROF(jboolean, JVM_HoldsLock, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3136 if (obj == nullptr) {
3137 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3138 }
3139 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3140 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj);
3141 JVM_END
3142
3143 JVM_ENTRY_PROF(jobject, JVM_GetStackTrace, JVM_GetStackTrace(JNIEnv *env, jobject jthread))
3144 oop trace = java_lang_Thread::async_get_stack_trace(JNIHandles::resolve(jthread), THREAD);
3145 return JNIHandles::make_local(THREAD, trace);
3146 JVM_END
3147
3148 JVM_ENTRY_PROF(void, JVM_DumpAllStacks, JVM_DumpAllStacks(JNIEnv* env, jclass))
3149 VM_PrintThreads op;
3150 VMThread::execute(&op);
3151 if (JvmtiExport::should_post_data_dump()) {
3152 JvmtiExport::post_data_dump();
3153 }
3154 JVM_END
3155
3156 JVM_ENTRY_PROF(void, JVM_SetNativeThreadName, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3157 // We don't use a ThreadsListHandle here because the current thread
3158 // must be alive.
3159 oop java_thread = JNIHandles::resolve_non_null(jthread);
3160 JavaThread* thr = java_lang_Thread::thread(java_thread);
3161 if (thread == thr && !thr->has_attached_via_jni()) {
3162 // Thread naming is only supported for the current thread and
3163 // we don't set the name of an attached thread to avoid stepping
3164 // on other programs.
3165 ResourceMark rm(thread);
3166 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3167 os::set_native_thread_name(thread_name);
3168 }
3169 JVM_END
3170
3171 JVM_ENTRY_PROF(jobject, JVM_ScopedValueCache, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass))
3172 oop theCache = thread->scopedValueCache();
3173 return JNIHandles::make_local(THREAD, theCache);
3174 JVM_END
3175
3176 JVM_ENTRY_PROF(void, JVM_SetScopedValueCache, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass,
3177 jobject theCache))
3178 arrayOop objs = arrayOop(JNIHandles::resolve(theCache));
3179 thread->set_scopedValueCache(objs);
3180 JVM_END
3181
3182 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3183
3184 JVM_ENTRY_PROF(jobjectArray, JVM_GetClassContext, JVM_GetClassContext(JNIEnv *env))
3185 ResourceMark rm(THREAD);
3186 JvmtiVMObjectAllocEventCollector oam;
3187 vframeStream vfst(thread);
3188
3189 if (vmClasses::reflect_CallerSensitive_klass() != nullptr) {
3190 // This must only be called from SecurityManager.getClassContext
3191 Method* m = vfst.method();
3192 if (!(m->method_holder() == vmClasses::SecurityManager_klass() &&
3193 m->name() == vmSymbols::getClassContext_name() &&
3194 m->signature() == vmSymbols::void_class_array_signature())) {
3195 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3196 }
3197 }
3198
3199 // Collect method holders
3200 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3201 for (; !vfst.at_end(); vfst.security_next()) {
3202 Method* m = vfst.method();
3203 // Native frames are not returned
3204 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3205 Klass* holder = m->method_holder();
3206 assert(holder->is_klass(), "just checking");
3207 klass_array->append(holder);
3208 }
3209 }
3210
3211 // Create result array of type [Ljava/lang/Class;
3212 objArrayOop result = oopFactory::new_objArray(vmClasses::Class_klass(), klass_array->length(), CHECK_NULL);
3213 // Fill in mirrors corresponding to method holders
3214 for (int i = 0; i < klass_array->length(); i++) {
3215 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3216 }
3217
3218 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3219 JVM_END
3220
3221
3222 // java.lang.Package ////////////////////////////////////////////////////////////////
3223
3224
3225 JVM_ENTRY_PROF(jstring, JVM_GetSystemPackage, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3226 ResourceMark rm(THREAD);
3227 JvmtiVMObjectAllocEventCollector oam;
3228 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3229 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3230 return (jstring) JNIHandles::make_local(THREAD, result);
3231 JVM_END
3232
3233
3234 JVM_ENTRY_PROF(jobjectArray, JVM_GetSystemPackages, JVM_GetSystemPackages(JNIEnv *env))
3235 JvmtiVMObjectAllocEventCollector oam;
3236 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3237 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3238 JVM_END
3239
3240
3241 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3242
3243
3244 JVM_ENTRY_PROF(jobject, JVM_GetAndClearReferencePendingList, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3245 MonitorLocker ml(Heap_lock);
3246 oop ref = Universe::reference_pending_list();
3247 if (ref != nullptr) {
3248 Universe::clear_reference_pending_list();
3249 }
3250 return JNIHandles::make_local(THREAD, ref);
3251 JVM_END
3252
3253 JVM_ENTRY_PROF(jboolean, JVM_HasReferencePendingList, JVM_HasReferencePendingList(JNIEnv* env))
3254 MonitorLocker ml(Heap_lock);
3255 return Universe::has_reference_pending_list();
3256 JVM_END
3257
3258 JVM_ENTRY_PROF(void, JVM_WaitForReferencePendingList, JVM_WaitForReferencePendingList(JNIEnv* env))
3259 MonitorLocker ml(Heap_lock);
3260 while (!Universe::has_reference_pending_list()) {
3261 ml.wait();
3262 }
3263 JVM_END
3264
3265 JVM_ENTRY_PROF(jboolean, JVM_ReferenceRefersTo, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3266 oop ref_oop = JNIHandles::resolve_non_null(ref);
3267 // PhantomReference has it's own implementation of refersTo().
3268 // See: JVM_PhantomReferenceRefersTo
3269 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3270 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop);
3271 return referent == JNIHandles::resolve(o);
3272 JVM_END
3273
3274 JVM_ENTRY_PROF(void, JVM_ReferenceClear, JVM_ReferenceClear(JNIEnv* env, jobject ref))
3275 oop ref_oop = JNIHandles::resolve_non_null(ref);
3276 // FinalReference has it's own implementation of clear().
3277 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition");
3278 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) {
3279 // If the referent has already been cleared then done.
3280 // However, if the referent is dead but has not yet been cleared by
3281 // concurrent reference processing, it should NOT be cleared here.
3282 // Instead, clearing should be left to the GC. Clearing it here could
3283 // detectably lose an expected notification, which is impossible with
3284 // STW reference processing. The clearing in enqueue() doesn't have
3285 // this problem, since the enqueue covers the notification, but it's not
3286 // worth the effort to handle that case specially.
3287 return;
3288 }
3289 java_lang_ref_Reference::clear_referent(ref_oop);
3290 JVM_END
3291
3292
3293 // java.lang.ref.PhantomReference //////////////////////////////////////////////////
3294
3295
3296 JVM_ENTRY_PROF(jboolean, JVM_PhantomReferenceRefersTo, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3297 oop ref_oop = JNIHandles::resolve_non_null(ref);
3298 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop);
3299 return referent == JNIHandles::resolve(o);
3300 JVM_END
3301
3302
3303 // ObjectInputStream ///////////////////////////////////////////////////////////////
3304
3305 // Return the first user-defined class loader up the execution stack, or null
3306 // if only code from the bootstrap or platform class loader is on the stack.
3307
3308 JVM_ENTRY_PROF(jobject, JVM_LatestUserDefinedLoader, JVM_LatestUserDefinedLoader(JNIEnv *env))
3309 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3310 InstanceKlass* ik = vfst.method()->method_holder();
3311 oop loader = ik->class_loader();
3312 if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) {
3313 // Skip reflection related frames
3314 if (!ik->is_subclass_of(vmClasses::reflect_SerializationConstructorAccessorImpl_klass())) {
3315 return JNIHandles::make_local(THREAD, loader);
3316 }
3317 }
3318 }
3319 return nullptr;
3320 JVM_END
3321
3322
3323 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3324
3325
3326 // resolve array handle and check arguments
3327 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3328 if (arr == nullptr) {
3329 THROW_0(vmSymbols::java_lang_NullPointerException());
3330 }
3331 oop a = JNIHandles::resolve_non_null(arr);
3332 if (!a->is_array()) {
3333 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3334 } else if (type_array_only && !a->is_typeArray()) {
3335 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3336 }
3337 return arrayOop(a);
3338 }
3339
3340
3341 JVM_ENTRY_PROF(jint, JVM_GetArrayLength, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3342 arrayOop a = check_array(env, arr, false, CHECK_0);
3343 return a->length();
3344 JVM_END
3345
3346
3347 JVM_ENTRY_PROF(jobject, JVM_GetArrayElement, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3348 JvmtiVMObjectAllocEventCollector oam;
3349 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3350 jvalue value;
3351 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3352 oop box = Reflection::box(&value, type, CHECK_NULL);
3353 return JNIHandles::make_local(THREAD, box);
3354 JVM_END
3355
3356
3357 JVM_ENTRY_PROF(jvalue, JVM_GetPrimitiveArrayElement, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3358 jvalue value;
3359 value.i = 0; // to initialize value before getting used in CHECK
3360 arrayOop a = check_array(env, arr, true, CHECK_(value));
3361 assert(a->is_typeArray(), "just checking");
3362 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3363 BasicType wide_type = (BasicType) wCode;
3364 if (type != wide_type) {
3365 Reflection::widen(&value, type, wide_type, CHECK_(value));
3366 }
3367 return value;
3368 JVM_END
3369
3370
3371 JVM_ENTRY_PROF(void, JVM_SetArrayElement, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3372 arrayOop a = check_array(env, arr, false, CHECK);
3373 oop box = JNIHandles::resolve(val);
3374 jvalue value;
3375 value.i = 0; // to initialize value before getting used in CHECK
3376 BasicType value_type;
3377 if (a->is_objArray()) {
3378 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3379 value_type = Reflection::unbox_for_regular_object(box, &value);
3380 } else {
3381 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3382 }
3383 Reflection::array_set(&value, a, index, value_type, CHECK);
3384 JVM_END
3385
3386
3387 JVM_ENTRY_PROF(void, JVM_SetPrimitiveArrayElement, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3388 arrayOop a = check_array(env, arr, true, CHECK);
3389 assert(a->is_typeArray(), "just checking");
3390 BasicType value_type = (BasicType) vCode;
3391 Reflection::array_set(&v, a, index, value_type, CHECK);
3392 JVM_END
3393
3394
3395 JVM_ENTRY_PROF(jobject, JVM_NewArray, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3396 JvmtiVMObjectAllocEventCollector oam;
3397 oop element_mirror = JNIHandles::resolve(eltClass);
3398 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3399 return JNIHandles::make_local(THREAD, result);
3400 JVM_END
3401
3402
3403 JVM_ENTRY_PROF(jobject, JVM_NewMultiArray, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3404 JvmtiVMObjectAllocEventCollector oam;
3405 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3406 oop element_mirror = JNIHandles::resolve(eltClass);
3407 assert(dim_array->is_typeArray(), "just checking");
3408 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3409 return JNIHandles::make_local(THREAD, result);
3410 JVM_END
3411
3412
3413 // Library support ///////////////////////////////////////////////////////////////////////////
3414
3415 JVM_LEAF_PROF(void*, JVM_LoadZipLibrary, JVM_LoadZipLibrary())
3416 return ZipLibrary::handle();
3417 JVM_END
3418
3419 JVM_ENTRY_NO_ENV_PROF(void*, JVM_LoadLibrary, JVM_LoadLibrary(const char* name, jboolean throwException))
3420 //%note jvm_ct
3421 char ebuf[1024];
3422 void *load_result;
3423 {
3424 ThreadToNativeFromVM ttnfvm(thread);
3425 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3426 }
3427 if (load_result == nullptr) {
3428 if (throwException) {
3429 char msg[1024];
3430 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3431 // Since 'ebuf' may contain a string encoded using
3432 // platform encoding scheme, we need to pass
3433 // Exceptions::unsafe_to_utf8 to the new_exception method
3434 // as the last argument. See bug 6367357.
3435 Handle h_exception =
3436 Exceptions::new_exception(thread,
3437 vmSymbols::java_lang_UnsatisfiedLinkError(),
3438 msg, Exceptions::unsafe_to_utf8);
3439
3440 THROW_HANDLE_0(h_exception);
3441 } else {
3442 log_info(library)("Failed to load library %s", name);
3443 return load_result;
3444 }
3445 }
3446 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3447 return load_result;
3448 JVM_END
3449
3450
3451 JVM_LEAF_PROF(void, JVM_UnloadLibrary, JVM_UnloadLibrary(void* handle))
3452 os::dll_unload(handle);
3453 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3454 JVM_END
3455
3456
3457 JVM_LEAF_PROF(void*, JVM_FindLibraryEntry, JVM_FindLibraryEntry(void* handle, const char* name))
3458 void* find_result = os::dll_lookup(handle, name);
3459 log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3460 find_result != nullptr ? "Found" : "Failed to find",
3461 name, p2i(handle));
3462 return find_result;
3463 JVM_END
3464
3465
3466 // JNI version ///////////////////////////////////////////////////////////////////////////////
3467
3468 JVM_LEAF_PROF(jboolean, JVM_IsSupportedJNIVersion, JVM_IsSupportedJNIVersion(jint version))
3469 return Threads::is_supported_jni_version_including_1_1(version);
3470 JVM_END
3471
3472
3473 JVM_LEAF_PROF(jboolean, JVM_IsPreviewEnabled, JVM_IsPreviewEnabled(void))
3474 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE;
3475 JVM_END
3476
3477 JVM_LEAF_PROF(jboolean, JVM_IsContinuationsSupported, JVM_IsContinuationsSupported(void))
3478 return VMContinuations ? JNI_TRUE : JNI_FALSE;
3479 JVM_END
3480
3481 JVM_LEAF_PROF(jboolean, JVM_IsForeignLinkerSupported, JVM_IsForeignLinkerSupported(void))
3482 return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE;
3483 JVM_END
3484
3485 // String support ///////////////////////////////////////////////////////////////////////////
3486
3487 JVM_ENTRY_PROF(jstring, JVM_InternString, JVM_InternString(JNIEnv *env, jstring str))
3488 JvmtiVMObjectAllocEventCollector oam;
3489 if (str == nullptr) return nullptr;
3490 oop string = JNIHandles::resolve_non_null(str);
3491 oop result = StringTable::intern(string, CHECK_NULL);
3492 return (jstring) JNIHandles::make_local(THREAD, result);
3493 JVM_END
3494
3495
3496 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3497
3498 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3499 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3500 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3501 // in the safepoint protocol, thread suspension, thread interruption, or anything of that
3502 // nature. JavaThreads will be "in native" when using this API from JDK code.
3503
3504
3505 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3506 VM_Exit::block_if_vm_exited();
3507 return new PlatformMutex();
3508 }
3509
3510
3511 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3512 VM_Exit::block_if_vm_exited();
3513 delete ((PlatformMutex*) mon);
3514 }
3515
3516
3517 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3518 VM_Exit::block_if_vm_exited();
3519 ((PlatformMutex*) mon)->lock();
3520 return 0;
3521 }
3522
3523
3524 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3525 VM_Exit::block_if_vm_exited();
3526 ((PlatformMutex*) mon)->unlock();
3527 }
3528
3529
3530 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3531
3532 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3533 Handle loader, Handle protection_domain,
3534 jboolean throwError, TRAPS) {
3535 // Security Note:
3536 // The Java level wrapper will perform the necessary security check allowing
3537 // us to pass the null as the initiating class loader. The VM is responsible for
3538 // the checkPackageAccess relative to the initiating class loader via the
3539 // protection_domain. The protection_domain is passed as null by the java code
3540 // if there is no security manager in 3-arg Class.forName().
3541 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3542
3543 // Check if we should initialize the class
3544 if (init && klass->is_instance_klass()) {
3545 klass->initialize(CHECK_NULL);
3546 }
3547 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror());
3548 }
3549
3550
3551 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3552
3553 JVM_ENTRY_PROF(jobject, JVM_InvokeMethod, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3554 Handle method_handle;
3555 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3556 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3557 Handle receiver(THREAD, JNIHandles::resolve(obj));
3558 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3559 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3560 jobject res = JNIHandles::make_local(THREAD, result);
3561 if (JvmtiExport::should_post_vm_object_alloc()) {
3562 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3563 assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!");
3564 if (java_lang_Class::is_primitive(ret_type)) {
3565 // Only for primitive type vm allocates memory for java object.
3566 // See box() method.
3567 JvmtiExport::post_vm_object_alloc(thread, result);
3568 }
3569 }
3570 return res;
3571 } else {
3572 THROW_0(vmSymbols::java_lang_StackOverflowError());
3573 }
3574 JVM_END
3575
3576
3577 JVM_ENTRY_PROF(jobject, JVM_NewInstanceFromConstructor, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3578 oop constructor_mirror = JNIHandles::resolve(c);
3579 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3580 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3581 jobject res = JNIHandles::make_local(THREAD, result);
3582 if (JvmtiExport::should_post_vm_object_alloc()) {
3583 JvmtiExport::post_vm_object_alloc(thread, result);
3584 }
3585 return res;
3586 JVM_END
3587
3588 JVM_ENTRY_PROF(void, JVM_InitializeFromArchive, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3589 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3590 assert(k->is_klass(), "just checking");
3591 HeapShared::initialize_from_archived_subgraph(THREAD, k);
3592 JVM_END
3593
3594 JVM_ENTRY_PROF(void, JVM_RegisterLambdaProxyClassForArchiving, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3595 jclass caller,
3596 jstring interfaceMethodName,
3597 jobject factoryType,
3598 jobject interfaceMethodType,
3599 jobject implementationMember,
3600 jobject dynamicMethodType,
3601 jclass lambdaProxyClass))
3602 #if INCLUDE_CDS
3603 if (!CDSConfig::is_dumping_archive()) {
3604 return;
3605 }
3606
3607 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3608 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3609 if (caller_ik->is_hidden()) {
3610 // Hidden classes not of type lambda proxy classes are currently not being archived.
3611 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3612 // registered for archiving.
3613 return;
3614 }
3615 Klass* lambda_k = java_lang_Class::as_Klass(JNIHandles::resolve(lambdaProxyClass));
3616 InstanceKlass* lambda_ik = InstanceKlass::cast(lambda_k);
3617 assert(lambda_ik->is_hidden(), "must be a hidden class");
3618 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3619
3620 Symbol* interface_method_name = nullptr;
3621 if (interfaceMethodName != nullptr) {
3622 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3623 }
3624 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3625 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3626
3627 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3628 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3629
3630 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3631 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3632 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3633
3634 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3635 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3636
3637 SystemDictionaryShared::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type,
3638 interface_method_type, m, dynamic_method_type, THREAD);
3639 #endif // INCLUDE_CDS
3640 JVM_END
3641
3642 JVM_ENTRY_PROF(jclass, JVM_LookupLambdaProxyClassFromArchive, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3643 jclass caller,
3644 jstring interfaceMethodName,
3645 jobject factoryType,
3646 jobject interfaceMethodType,
3647 jobject implementationMember,
3648 jobject dynamicMethodType))
3649 #if INCLUDE_CDS
3650
3651 if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr ||
3652 implementationMember == nullptr || dynamicMethodType == nullptr) {
3653 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
3654 }
3655
3656 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3657 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3658 if (!caller_ik->is_shared()) {
3659 // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3660 return nullptr;
3661 }
3662
3663 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3664 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3665 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3666
3667 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3668 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3669
3670 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3671 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3672 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3673
3674 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3675 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3676
3677 InstanceKlass* lambda_ik = SystemDictionaryShared::get_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type,
3678 interface_method_type, m, dynamic_method_type);
3679 jclass jcls = nullptr;
3680 if (lambda_ik != nullptr) {
3681 InstanceKlass* loaded_lambda = SystemDictionaryShared::prepare_shared_lambda_proxy_class(lambda_ik, caller_ik, THREAD);
3682 jcls = loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror());
3683 }
3684 return jcls;
3685 #else
3686 return nullptr;
3687 #endif // INCLUDE_CDS
3688 JVM_END
3689
3690 JVM_ENTRY_NO_ENV_PROF(jlong, JVM_GetRandomSeedForDumping, JVM_GetRandomSeedForDumping())
3691 if (CDSConfig::is_dumping_static_archive()) {
3692 // We do this so that the default CDS archive can be deterministic.
3693 const char* release = VM_Version::vm_release();
3694 const char* dbg_level = VM_Version::jdk_debug_level();
3695 const char* version = VM_Version::internal_vm_info_string();
3696 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3697 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3698 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3699 seed += (jlong)VM_Version::vm_major_version();
3700 seed += (jlong)VM_Version::vm_minor_version();
3701 seed += (jlong)VM_Version::vm_security_version();
3702 seed += (jlong)VM_Version::vm_patch_version();
3703 if (seed == 0) { // don't let this ever be zero.
3704 seed = 0x87654321;
3705 }
3706 log_debug(cds)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed);
3707 return seed;
3708 } else {
3709 return 0;
3710 }
3711 JVM_END
3712
3713 JVM_ENTRY_NO_ENV_PROF(jint, JVM_GetCDSConfigStatus, JVM_GetCDSConfigStatus())
3714 return CDSConfig::get_status();
3715 JVM_END
3716
3717 JVM_ENTRY_PROF(void, JVM_LogLambdaFormInvoker, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line))
3718 #if INCLUDE_CDS
3719 assert(CDSConfig::is_logging_lambda_form_invokers(), "sanity");
3720 if (line != nullptr) {
3721 ResourceMark rm(THREAD);
3722 Handle h_line (THREAD, JNIHandles::resolve_non_null(line));
3723 char* c_line = java_lang_String::as_utf8_string(h_line());
3724 if (CDSConfig::is_dumping_dynamic_archive() || CDSConfig::is_dumping_preimage_static_archive()) {
3725 // Note: LambdaFormInvokers::append take same format which is not
3726 // same as below the print format. The line does not include LAMBDA_FORM_TAG.
3727 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal));
3728 }
3729 if (ClassListWriter::is_enabled()) {
3730 ClassListWriter w;
3731 w.stream()->print_cr("%s %s", ClassListParser::lambda_form_tag(), c_line);
3732 }
3733 }
3734 #endif // INCLUDE_CDS
3735 JVM_END
3736
3737 JVM_ENTRY_PROF(void, JVM_LogDynamicProxy, JVM_LogDynamicProxy(JNIEnv *env, jobject loader, jstring proxy_name, jobjectArray interfaces, jint access_flags))
3738 #if INCLUDE_CDS
3739 assert(CDSConfig::is_tracing_dynamic_proxy(), "sanity");
3740
3741 ResourceMark rm(THREAD);
3742 oop proxy_name_oop = JNIHandles::resolve_non_null(proxy_name);
3743 char* proxy_name_str = java_lang_String::as_utf8_string(proxy_name_oop);
3744 oop loader_oop = JNIHandles::resolve(loader);
3745 objArrayOop interfaces_oop = objArrayOop(JNIHandles::resolve_non_null(interfaces));
3746
3747 ClassPrelinker::trace_dynamic_proxy_class(loader_oop, proxy_name_str, interfaces_oop, access_flags);
3748 #endif // INCLUDE_CDS
3749 JVM_END
3750
3751 JVM_ENTRY_PROF(void, JVM_DumpClassListToFile, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName))
3752 #if INCLUDE_CDS
3753 ResourceMark rm(THREAD);
3754 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName));
3755 char* file_name = java_lang_String::as_utf8_string(file_handle());
3756 MetaspaceShared::dump_loaded_classes(file_name, THREAD);
3757 #endif // INCLUDE_CDS
3758 JVM_END
3759
3760 JVM_ENTRY_PROF(void, JVM_DumpDynamicArchive, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName))
3761 #if INCLUDE_CDS
3762 ResourceMark rm(THREAD);
3763 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName));
3764 char* archive_name = java_lang_String::as_utf8_string(file_handle());
3765 DynamicArchive::dump_for_jcmd(archive_name, CHECK);
3766 #endif // INCLUDE_CDS
3767 JVM_END
3768
3769 // Returns an array of all live Thread objects (VM internal JavaThreads,
3770 // jvmti agent threads, and JNI attaching threads are skipped)
3771 // See CR 6404306 regarding JNI attaching threads
3772 JVM_ENTRY_PROF(jobjectArray, JVM_GetAllThreads, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3773 ResourceMark rm(THREAD);
3774 ThreadsListEnumerator tle(THREAD, false, false);
3775 JvmtiVMObjectAllocEventCollector oam;
3776
3777 int num_threads = tle.num_threads();
3778 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL);
3779 objArrayHandle threads_ah(THREAD, r);
3780
3781 for (int i = 0; i < num_threads; i++) {
3782 Handle h = tle.get_threadObj(i);
3783 threads_ah->obj_at_put(i, h());
3784 }
3785
3786 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah());
3787 JVM_END
3788
3789
3790 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3791 // Return StackTraceElement[][], each element is the stack trace of a thread in
3792 // the corresponding entry in the given threads array
3793 JVM_ENTRY_PROF(jobjectArray, JVM_DumpThreads, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3794 JvmtiVMObjectAllocEventCollector oam;
3795
3796 // Check if threads is null
3797 if (threads == nullptr) {
3798 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3799 }
3800
3801 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3802 objArrayHandle ah(THREAD, a);
3803 int num_threads = ah->length();
3804 // check if threads is non-empty array
3805 if (num_threads == 0) {
3806 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3807 }
3808
3809 // check if threads is not an array of objects of Thread class
3810 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3811 if (k != vmClasses::Thread_klass()) {
3812 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3813 }
3814
3815 ResourceMark rm(THREAD);
3816
3817 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3818 for (int i = 0; i < num_threads; i++) {
3819 oop thread_obj = ah->obj_at(i);
3820 instanceHandle h(THREAD, (instanceOop) thread_obj);
3821 thread_handle_array->append(h);
3822 }
3823
3824 // The JavaThread references in thread_handle_array are validated
3825 // in VM_ThreadDump::doit().
3826 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3827 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces());
3828
3829 JVM_END
3830
3831 // JVM monitoring and management support
3832 JVM_LEAF_PROF(void*, JVM_GetManagement, JVM_GetManagement(jint version))
3833 return Management::get_jmm_interface(version);
3834 JVM_END
3835
3836 // com.sun.tools.attach.VirtualMachine agent properties support
3837 //
3838 // Initialize the agent properties with the properties maintained in the VM
3839 JVM_ENTRY_PROF(jobject, JVM_InitAgentProperties, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3840 ResourceMark rm;
3841
3842 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3843
3844 PUTPROP(props, "sun.java.command", Arguments::java_command());
3845 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3846 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3847 return properties;
3848 JVM_END
3849
3850 JVM_ENTRY_PROF(jobjectArray, JVM_GetEnclosingMethodInfo, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3851 {
3852 JvmtiVMObjectAllocEventCollector oam;
3853
3854 if (ofClass == nullptr) {
3855 return nullptr;
3856 }
3857 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3858 // Special handling for primitive objects
3859 if (java_lang_Class::is_primitive(mirror())) {
3860 return nullptr;
3861 }
3862 Klass* k = java_lang_Class::as_Klass(mirror());
3863 if (!k->is_instance_klass()) {
3864 return nullptr;
3865 }
3866 InstanceKlass* ik = InstanceKlass::cast(k);
3867 int encl_method_class_idx = ik->enclosing_method_class_index();
3868 if (encl_method_class_idx == 0) {
3869 return nullptr;
3870 }
3871 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL);
3872 objArrayHandle dest(THREAD, dest_o);
3873 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3874 dest->obj_at_put(0, enc_k->java_mirror());
3875 int encl_method_method_idx = ik->enclosing_method_method_index();
3876 if (encl_method_method_idx != 0) {
3877 Symbol* sym = ik->constants()->symbol_at(
3878 extract_low_short_from_int(
3879 ik->constants()->name_and_type_at(encl_method_method_idx)));
3880 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3881 dest->obj_at_put(1, str());
3882 sym = ik->constants()->symbol_at(
3883 extract_high_short_from_int(
3884 ik->constants()->name_and_type_at(encl_method_method_idx)));
3885 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3886 dest->obj_at_put(2, str());
3887 }
3888 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
3889 }
3890 JVM_END
3891
3892 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3893 JVM_ENTRY_PROF(jobjectArray, JVM_GetVmArguments, JVM_GetVmArguments(JNIEnv *env))
3894 ResourceMark rm(THREAD);
3895
3896 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3897 return nullptr;
3898 }
3899
3900 char** vm_flags = Arguments::jvm_flags_array();
3901 char** vm_args = Arguments::jvm_args_array();
3902 int num_flags = Arguments::num_jvm_flags();
3903 int num_args = Arguments::num_jvm_args();
3904
3905 InstanceKlass* ik = vmClasses::String_klass();
3906 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3907 objArrayHandle result_h(THREAD, r);
3908
3909 int index = 0;
3910 for (int j = 0; j < num_flags; j++, index++) {
3911 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3912 result_h->obj_at_put(index, h());
3913 }
3914 for (int i = 0; i < num_args; i++, index++) {
3915 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3916 result_h->obj_at_put(index, h());
3917 }
3918 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
3919 JVM_END
3920
3921 JVM_LEAF_PROF(jint, JVM_FindSignal, JVM_FindSignal(const char *name))
3922 return os::get_signal_number(name);
3923 JVM_END
3924
3925 JVM_ENTRY_PROF(void, JVM_VirtualThreadStart, JVM_VirtualThreadStart(JNIEnv* env, jobject vthread))
3926 #if INCLUDE_JVMTI
3927 if (!DoJVMTIVirtualThreadTransitions) {
3928 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3929 return;
3930 }
3931 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3932 JvmtiVTMSTransitionDisabler::VTMS_vthread_start(vthread);
3933 } else {
3934 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3935 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, false);
3936 }
3937 #endif
3938 JVM_END
3939
3940 JVM_ENTRY_PROF(void, JVM_VirtualThreadEnd, JVM_VirtualThreadEnd(JNIEnv* env, jobject vthread))
3941 #if INCLUDE_JVMTI
3942 if (!DoJVMTIVirtualThreadTransitions) {
3943 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3944 return;
3945 }
3946 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3947 JvmtiVTMSTransitionDisabler::VTMS_vthread_end(vthread);
3948 } else {
3949 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3950 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, true);
3951 }
3952 #endif
3953 JVM_END
3954
3955 // If notifications are disabled then just update the VTMS transition bit and return.
3956 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call.
3957 JVM_ENTRY_PROF(void, JVM_VirtualThreadMount, JVM_VirtualThreadMount(JNIEnv* env, jobject vthread, jboolean hide))
3958 #if INCLUDE_JVMTI
3959 if (!DoJVMTIVirtualThreadTransitions) {
3960 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3961 return;
3962 }
3963 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3964 JvmtiVTMSTransitionDisabler::VTMS_vthread_mount(vthread, hide);
3965 } else {
3966 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3967 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
3968 }
3969 #endif
3970 JVM_END
3971
3972 // If notifications are disabled then just update the VTMS transition bit and return.
3973 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call below.
3974 JVM_ENTRY_PROF(void, JVM_VirtualThreadUnmount, JVM_VirtualThreadUnmount(JNIEnv* env, jobject vthread, jboolean hide))
3975 #if INCLUDE_JVMTI
3976 if (!DoJVMTIVirtualThreadTransitions) {
3977 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3978 return;
3979 }
3980 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3981 JvmtiVTMSTransitionDisabler::VTMS_vthread_unmount(vthread, hide);
3982 } else {
3983 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3984 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
3985 }
3986 #endif
3987 JVM_END
3988
3989 // Always update the temporary VTMS transition bit.
3990 JVM_ENTRY_PROF(void, JVM_VirtualThreadHideFrames, JVM_VirtualThreadHideFrames(JNIEnv* env, jclass clazz, jboolean hide))
3991 #if INCLUDE_JVMTI
3992 if (!DoJVMTIVirtualThreadTransitions) {
3993 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3994 return;
3995 }
3996 assert(!thread->is_in_VTMS_transition(), "sanity check");
3997 assert(thread->is_in_tmp_VTMS_transition() != (bool)hide, "sanity check");
3998 thread->toggle_is_in_tmp_VTMS_transition();
3999 #endif
4000 JVM_END
4001
4002 // Notification from VirtualThread about disabling JVMTI Suspend in a sync critical section.
4003 // Needed to avoid deadlocks with JVMTI suspend mechanism.
4004 JVM_ENTRY(void, JVM_VirtualThreadDisableSuspend(JNIEnv* env, jclass clazz, jboolean enter))
4005 #if INCLUDE_JVMTI
4006 if (!DoJVMTIVirtualThreadTransitions) {
4007 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
4008 return;
4009 }
4010 assert(thread->is_disable_suspend() != (bool)enter,
4011 "nested or unbalanced monitor enter/exit is not allowed");
4012 thread->toggle_is_disable_suspend();
4013 #endif
4014 JVM_END
4015
4016 /*
4017 * Return the current class's class file version. The low order 16 bits of the
4018 * returned jint contain the class's major version. The high order 16 bits
4019 * contain the class's minor version.
4020 */
4021 JVM_ENTRY_PROF(jint, JVM_GetClassFileVersion, JVM_GetClassFileVersion(JNIEnv* env, jclass current))
4022 oop mirror = JNIHandles::resolve_non_null(current);
4023 if (java_lang_Class::is_primitive(mirror)) {
4024 // return latest major version and minor version of 0.
4025 return JVM_CLASSFILE_MAJOR_VERSION;
4026 }
4027 assert(!java_lang_Class::as_Klass(mirror)->is_array_klass(), "unexpected array class");
4028
4029 Klass* c = java_lang_Class::as_Klass(mirror);
4030 assert(c->is_instance_klass(), "must be");
4031 InstanceKlass* ik = InstanceKlass::cast(c);
4032 return (ik->minor_version() << 16) | ik->major_version();
4033 JVM_END
4034
4035 /*
4036 * Ensure that code doing a stackwalk and using javaVFrame::locals() to
4037 * get the value will see a materialized value and not a scalar-replaced
4038 * null value.
4039 */
4040 JVM_ENTRY_PROF(void, JVM_EnsureMaterializedForStackWalk_func, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value))
4041 JVM_EnsureMaterializedForStackWalk(env, value);
4042 JVM_END
4043
4044 /*
4045 * Return JNI_TRUE if warnings are printed when agents are dynamically loaded.
4046 */
4047 JVM_LEAF_PROF(jboolean, JVM_PrintWarningAtDynamicAgentLoad, JVM_PrintWarningAtDynamicAgentLoad(void))
4048 return (EnableDynamicAgentLoading && !FLAG_IS_CMDLINE(EnableDynamicAgentLoading)) ? JNI_TRUE : JNI_FALSE;
4049 JVM_END
4050
4051 #define DO_COUNTERS(macro) \
4052 macro(JVM_CurrentTimeMillis) \
4053 macro(JVM_NanoTime) \
4054 macro(JVM_GetNanoTimeAdjustment) \
4055 macro(JVM_ArrayCopy) \
4056 macro(JVM_GetProperties) \
4057 macro(JVM_GetTemporaryDirectory) \
4058 macro(JVM_BeforeHalt) \
4059 macro(JVM_Halt) \
4060 macro(JVM_GC) \
4061 macro(JVM_MaxObjectInspectionAge) \
4062 macro(JVM_TotalMemory) \
4063 macro(JVM_FreeMemory) \
4064 macro(JVM_MaxMemory) \
4065 macro(JVM_ActiveProcessorCount) \
4066 macro(JVM_IsUseContainerSupport) \
4067 macro(JVM_FillInStackTrace) \
4068 macro(JVM_GetExtendedNPEMessage) \
4069 macro(JVM_InitStackTraceElementArray) \
4070 macro(JVM_InitStackTraceElement) \
4071 macro(JVM_ExpandStackFrameInfo) \
4072 macro(JVM_CallStackWalk) \
4073 macro(JVM_MoreStackWalk) \
4074 macro(JVM_SetStackWalkContinuation) \
4075 macro(JVM_IHashCode) \
4076 macro(JVM_MonitorWait) \
4077 macro(JVM_MonitorNotify) \
4078 macro(JVM_MonitorNotifyAll) \
4079 macro(JVM_Clone) \
4080 macro(JVM_ReportFinalizationComplete) \
4081 macro(JVM_IsFinalizationEnabled) \
4082 macro(JVM_RegisterContinuationMethods) \
4083 macro(JVM_NativePath) \
4084 macro(JVM_GetCallerClass) \
4085 macro(JVM_FindPrimitiveClass) \
4086 macro(JVM_FindClassFromBootLoader) \
4087 macro(JVM_FindClassFromCaller) \
4088 macro(JVM_FindClassFromClass) \
4089 macro(JVM_DefineClass) \
4090 macro(JVM_LookupDefineClass) \
4091 macro(JVM_DefineClassWithSource) \
4092 macro(JVM_FindLoadedClass) \
4093 macro(JVM_DefineModule) \
4094 macro(JVM_SetBootLoaderUnnamedModule) \
4095 macro(JVM_AddModuleExports) \
4096 macro(JVM_AddModuleExportsToAllUnnamed) \
4097 macro(JVM_AddModuleExportsToAll) \
4098 macro(JVM_AddReadsModule) \
4099 macro(JVM_DefineArchivedModules) \
4100 macro(JVM_InitClassName) \
4101 macro(JVM_GetClassInterfaces) \
4102 macro(JVM_IsInterface) \
4103 macro(JVM_IsHiddenClass) \
4104 macro(JVM_GetClassSigners) \
4105 macro(JVM_SetClassSigners) \
4106 macro(JVM_GetProtectionDomain) \
4107 macro(JVM_GetInheritedAccessControlContext) \
4108 macro(JVM_GetStackAccessControlContext) \
4109 macro(JVM_FindScopedValueBindings) \
4110 macro(JVM_IsArrayClass) \
4111 macro(JVM_IsPrimitiveClass) \
4112 macro(JVM_GetClassModifiers) \
4113 macro(JVM_GetDeclaredClasses) \
4114 macro(JVM_GetDeclaringClass) \
4115 macro(JVM_GetSimpleBinaryName) \
4116 macro(JVM_GetClassSignature) \
4117 macro(JVM_GetClassAnnotations) \
4118 macro(JVM_GetClassTypeAnnotations) \
4119 macro(JVM_GetMethodTypeAnnotations) \
4120 macro(JVM_GetFieldTypeAnnotations) \
4121 macro(JVM_GetMethodParameters) \
4122 macro(JVM_GetClassDeclaredFields) \
4123 macro(JVM_IsRecord) \
4124 macro(JVM_GetRecordComponents) \
4125 macro(JVM_GetClassDeclaredMethods) \
4126 macro(JVM_GetClassDeclaredConstructors) \
4127 macro(JVM_GetClassAccessFlags) \
4128 macro(JVM_AreNestMates) \
4129 macro(JVM_GetNestHost) \
4130 macro(JVM_GetNestMembers) \
4131 macro(JVM_GetPermittedSubclasses) \
4132 macro(JVM_GetClassConstantPool) \
4133 macro(JVM_ConstantPoolGetSize) \
4134 macro(JVM_ConstantPoolGetClassAt) \
4135 macro(JVM_ConstantPoolGetClassAtIfLoaded) \
4136 macro(JVM_ConstantPoolGetMethodAt) \
4137 macro(JVM_ConstantPoolGetMethodAtIfLoaded) \
4138 macro(JVM_ConstantPoolGetFieldAt) \
4139 macro(JVM_ConstantPoolGetFieldAtIfLoaded) \
4140 macro(JVM_ConstantPoolGetMemberRefInfoAt) \
4141 macro(JVM_ConstantPoolGetClassRefIndexAt) \
4142 macro(JVM_ConstantPoolGetNameAndTypeRefIndexAt) \
4143 macro(JVM_ConstantPoolGetNameAndTypeRefInfoAt) \
4144 macro(JVM_ConstantPoolGetIntAt) \
4145 macro(JVM_ConstantPoolGetLongAt) \
4146 macro(JVM_ConstantPoolGetFloatAt) \
4147 macro(JVM_ConstantPoolGetDoubleAt) \
4148 macro(JVM_ConstantPoolGetStringAt) \
4149 macro(JVM_ConstantPoolGetUTF8At) \
4150 macro(JVM_ConstantPoolGetTagAt) \
4151 macro(JVM_DesiredAssertionStatus) \
4152 macro(JVM_AssertionStatusDirectives) \
4153 macro(JVM_GetClassNameUTF) \
4154 macro(JVM_GetClassCPTypes) \
4155 macro(JVM_GetClassCPEntriesCount) \
4156 macro(JVM_GetClassFieldsCount) \
4157 macro(JVM_GetClassMethodsCount) \
4158 macro(JVM_GetMethodIxExceptionIndexes) \
4159 macro(JVM_GetMethodIxExceptionsCount) \
4160 macro(JVM_GetMethodIxByteCode) \
4161 macro(JVM_GetMethodIxByteCodeLength) \
4162 macro(JVM_GetMethodIxExceptionTableEntry) \
4163 macro(JVM_GetMethodIxExceptionTableLength) \
4164 macro(JVM_GetMethodIxModifiers) \
4165 macro(JVM_GetFieldIxModifiers) \
4166 macro(JVM_GetMethodIxLocalsCount) \
4167 macro(JVM_GetMethodIxArgsSize) \
4168 macro(JVM_GetMethodIxMaxStack) \
4169 macro(JVM_IsConstructorIx) \
4170 macro(JVM_IsVMGeneratedMethodIx) \
4171 macro(JVM_GetMethodIxNameUTF) \
4172 macro(JVM_GetMethodIxSignatureUTF) \
4173 macro(JVM_GetCPFieldNameUTF) \
4174 macro(JVM_GetCPMethodNameUTF) \
4175 macro(JVM_GetCPMethodSignatureUTF) \
4176 macro(JVM_GetCPFieldSignatureUTF) \
4177 macro(JVM_GetCPClassNameUTF) \
4178 macro(JVM_GetCPFieldClassNameUTF) \
4179 macro(JVM_GetCPMethodClassNameUTF) \
4180 macro(JVM_GetCPFieldModifiers) \
4181 macro(JVM_GetCPMethodModifiers) \
4182 macro(JVM_ReleaseUTF) \
4183 macro(JVM_IsSameClassPackage) \
4184 macro(JVM_StartThread) \
4185 macro(JVM_SetThreadPriority) \
4186 macro(JVM_Yield) \
4187 macro(JVM_SleepNanos) \
4188 macro(JVM_CurrentCarrierThread) \
4189 macro(JVM_CurrentThread) \
4190 macro(JVM_SetCurrentThread) \
4191 macro(JVM_GetNextThreadIdOffset) \
4192 macro(JVM_Interrupt) \
4193 macro(JVM_HoldsLock) \
4194 macro(JVM_GetStackTrace) \
4195 macro(JVM_DumpAllStacks) \
4196 macro(JVM_SetNativeThreadName) \
4197 macro(JVM_ScopedValueCache) \
4198 macro(JVM_SetScopedValueCache) \
4199 macro(JVM_GetClassContext) \
4200 macro(JVM_GetSystemPackage) \
4201 macro(JVM_GetSystemPackages) \
4202 macro(JVM_GetAndClearReferencePendingList) \
4203 macro(JVM_HasReferencePendingList) \
4204 macro(JVM_WaitForReferencePendingList) \
4205 macro(JVM_ReferenceRefersTo) \
4206 macro(JVM_ReferenceClear) \
4207 macro(JVM_PhantomReferenceRefersTo) \
4208 macro(JVM_LatestUserDefinedLoader) \
4209 macro(JVM_GetArrayLength) \
4210 macro(JVM_GetArrayElement) \
4211 macro(JVM_GetPrimitiveArrayElement) \
4212 macro(JVM_SetArrayElement) \
4213 macro(JVM_SetPrimitiveArrayElement) \
4214 macro(JVM_NewArray) \
4215 macro(JVM_NewMultiArray) \
4216 macro(JVM_LoadZipLibrary) \
4217 macro(JVM_LoadLibrary) \
4218 macro(JVM_UnloadLibrary) \
4219 macro(JVM_FindLibraryEntry) \
4220 macro(JVM_IsSupportedJNIVersion) \
4221 macro(JVM_IsPreviewEnabled) \
4222 macro(JVM_IsContinuationsSupported) \
4223 macro(JVM_IsForeignLinkerSupported) \
4224 macro(JVM_InternString) \
4225 macro(JVM_InvokeMethod) \
4226 macro(JVM_NewInstanceFromConstructor) \
4227 macro(JVM_InitializeFromArchive) \
4228 macro(JVM_RegisterLambdaProxyClassForArchiving) \
4229 macro(JVM_LookupLambdaProxyClassFromArchive) \
4230 macro(JVM_GetRandomSeedForDumping) \
4231 macro(JVM_LogLambdaFormInvoker) \
4232 macro(JVM_LogDynamicProxy) \
4233 macro(JVM_DumpClassListToFile) \
4234 macro(JVM_DumpDynamicArchive) \
4235 macro(JVM_GetAllThreads) \
4236 macro(JVM_DumpThreads) \
4237 macro(JVM_GetManagement) \
4238 macro(JVM_InitAgentProperties) \
4239 macro(JVM_GetEnclosingMethodInfo) \
4240 macro(JVM_GetVmArguments) \
4241 macro(JVM_FindSignal) \
4242 macro(JVM_VirtualThreadStart) \
4243 macro(JVM_VirtualThreadEnd) \
4244 macro(JVM_VirtualThreadMount) \
4245 macro(JVM_VirtualThreadUnmount) \
4246 macro(JVM_VirtualThreadHideFrames) \
4247 macro(JVM_GetClassFileVersion) \
4248 macro(JVM_EnsureMaterializedForStackWalk_func) \
4249 macro(JVM_PrintWarningAtDynamicAgentLoad)
4250
4251 #define INIT_COUNTER(name) \
4252 NEWPERFTICKCOUNTERS(_perf_##name##_timer, SUN_RT, #name); \
4253 NEWPERFEVENTCOUNTER(_perf_##name##_count, SUN_RT, #name "_count"); \
4254
4255 void perf_jvm_init() {
4256 if (ProfileVMCalls && UsePerfData) {
4257 EXCEPTION_MARK;
4258
4259 DO_COUNTERS(INIT_COUNTER)
4260
4261 if (HAS_PENDING_EXCEPTION) {
4262 vm_exit_during_initialization("jvm_perf_init failed unexpectedly");
4263 }
4264 }
4265 }
4266
4267 #undef INIT_COUNTER
4268
4269 #define PRINT_COUNTER(name) {\
4270 jlong count = _perf_##name##_count->get_value(); \
4271 if (count > 0) { \
4272 st->print_cr(" %-40s = %4ldms (elapsed) %4ldms (thread) (%5ld events)", #name, \
4273 _perf_##name##_timer->elapsed_counter_value_ms(), _perf_##name##_timer->thread_counter_value_ms(), count); \
4274 }}
4275
4276 void perf_jvm_print_on(outputStream* st) {
4277 if (ProfileVMCalls && UsePerfData) {
4278 DO_COUNTERS(PRINT_COUNTER)
4279 } else {
4280 st->print_cr(" JVM: no info (%s is disabled)", (UsePerfData ? "ProfileVMCalls" : "UsePerfData"));
4281 }
4282 }
4283
4284 #undef PRINT_COUNTER