1 /*
2 * Copyright (c) 2012, 2013, 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
27 #include "memory/universe.hpp"
28 #include "oops/oop.inline.hpp"
29
30 #include "classfile/symbolTable.hpp"
31 #include "classfile/classLoaderData.hpp"
32
33 #include "prims/whitebox.hpp"
34 #include "prims/wbtestmethods/parserTests.hpp"
35
36 #include "runtime/arguments.hpp"
37 #include "runtime/interfaceSupport.hpp"
38 #include "runtime/os.hpp"
39 #include "utilities/debug.hpp"
40 #include "utilities/macros.hpp"
41 #include "utilities/exceptions.hpp"
42
43 #if INCLUDE_ALL_GCS
44 #include "gc_implementation/g1/concurrentMark.hpp"
45 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
46 #include "gc_implementation/g1/heapRegionRemSet.hpp"
47 #endif // INCLUDE_ALL_GCS
48
49 #ifdef INCLUDE_NMT
50 #include "services/memTracker.hpp"
51 #endif // INCLUDE_NMT
52
53 #include "compiler/compileBroker.hpp"
54 #include "runtime/compilationPolicy.hpp"
55
56 bool WhiteBox::_used = false;
57
58 WB_ENTRY(jlong, WB_GetObjectAddress(JNIEnv* env, jobject o, jobject obj))
59 return (jlong)(void*)JNIHandles::resolve(obj);
60 WB_END
61
62 WB_ENTRY(jint, WB_GetHeapOopSize(JNIEnv* env, jobject o))
63 return heapOopSize;
64 WB_END
65
66
67 class WBIsKlassAliveClosure : public KlassClosure {
68 Symbol* _name;
69 bool _found;
70 public:
71 WBIsKlassAliveClosure(Symbol* name) : _name(name), _found(false) {}
72
73 void do_klass(Klass* k) {
74 if (_found) return;
75 Symbol* ksym = k->name();
76 if (ksym->fast_compare(_name) == 0) {
77 _found = true;
78 }
79 }
80
81 bool found() const {
82 return _found;
83 }
84 };
85
86 WB_ENTRY(jboolean, WB_IsClassAlive(JNIEnv* env, jobject target, jstring name))
87 Handle h_name = JNIHandles::resolve(name);
88 if (h_name.is_null()) return false;
89 Symbol* sym = java_lang_String::as_symbol(h_name, CHECK_false);
90 TempNewSymbol tsym(sym); // Make sure to decrement reference count on sym on return
91
92 WBIsKlassAliveClosure closure(sym);
93 ClassLoaderDataGraph::classes_do(&closure);
94
95 return closure.found();
96 WB_END
97
98 WB_ENTRY(jlong, WB_GetCompressedOopsMaxHeapSize(JNIEnv* env, jobject o)) {
99 return (jlong)Arguments::max_heap_for_compressed_oops();
100 }
101 WB_END
102
103 WB_ENTRY(void, WB_PrintHeapSizes(JNIEnv* env, jobject o)) {
104 CollectorPolicy * p = Universe::heap()->collector_policy();
105 gclog_or_tty->print_cr("Minimum heap "SIZE_FORMAT" Initial heap "
106 SIZE_FORMAT" Maximum heap "SIZE_FORMAT" Min alignment "SIZE_FORMAT" Max alignment "SIZE_FORMAT,
107 p->min_heap_byte_size(), p->initial_heap_byte_size(), p->max_heap_byte_size(),
108 p->min_alignment(), p->max_alignment());
109 }
110 WB_END
111
112 #if INCLUDE_ALL_GCS
113 WB_ENTRY(jboolean, WB_G1IsHumongous(JNIEnv* env, jobject o, jobject obj))
114 G1CollectedHeap* g1 = G1CollectedHeap::heap();
115 oop result = JNIHandles::resolve(obj);
116 const HeapRegion* hr = g1->heap_region_containing(result);
117 return hr->isHumongous();
118 WB_END
119
120 WB_ENTRY(jlong, WB_G1NumFreeRegions(JNIEnv* env, jobject o))
121 G1CollectedHeap* g1 = G1CollectedHeap::heap();
122 size_t nr = g1->free_regions();
123 return (jlong)nr;
124 WB_END
125
126 WB_ENTRY(jboolean, WB_G1InConcurrentMark(JNIEnv* env, jobject o))
127 G1CollectedHeap* g1 = G1CollectedHeap::heap();
128 ConcurrentMark* cm = g1->concurrent_mark();
129 return cm->concurrent_marking_in_progress();
130 WB_END
131
132 WB_ENTRY(jint, WB_G1RegionSize(JNIEnv* env, jobject o))
133 return (jint)HeapRegion::GrainBytes;
134 WB_END
135 #endif // INCLUDE_ALL_GCS
136
137 #if INCLUDE_NMT
138 // Alloc memory using the test memory type so that we can use that to see if
139 // NMT picks it up correctly
140 WB_ENTRY(jlong, WB_NMTMalloc(JNIEnv* env, jobject o, jlong size))
141 jlong addr = 0;
142
143 if (MemTracker::is_on() && !MemTracker::shutdown_in_progress()) {
144 addr = (jlong)(uintptr_t)os::malloc(size, mtTest);
145 }
146
147 return addr;
148 WB_END
149
150 // Free the memory allocated by NMTAllocTest
151 WB_ENTRY(void, WB_NMTFree(JNIEnv* env, jobject o, jlong mem))
152 os::free((void*)(uintptr_t)mem, mtTest);
153 WB_END
154
155 WB_ENTRY(jlong, WB_NMTReserveMemory(JNIEnv* env, jobject o, jlong size))
156 jlong addr = 0;
157
158 if (MemTracker::is_on() && !MemTracker::shutdown_in_progress()) {
159 addr = (jlong)(uintptr_t)os::reserve_memory(size);
160 MemTracker::record_virtual_memory_type((address)addr, mtTest);
161 }
162
163 return addr;
164 WB_END
165
166
167 WB_ENTRY(void, WB_NMTCommitMemory(JNIEnv* env, jobject o, jlong addr, jlong size))
168 os::commit_memory((char *)(uintptr_t)addr, size, !ExecMem);
169 MemTracker::record_virtual_memory_type((address)(uintptr_t)addr, mtTest);
170 WB_END
171
172 WB_ENTRY(void, WB_NMTUncommitMemory(JNIEnv* env, jobject o, jlong addr, jlong size))
173 os::uncommit_memory((char *)(uintptr_t)addr, size);
174 WB_END
175
176 WB_ENTRY(void, WB_NMTReleaseMemory(JNIEnv* env, jobject o, jlong addr, jlong size))
177 os::release_memory((char *)(uintptr_t)addr, size);
178 WB_END
179
180 // Block until the current generation of NMT data to be merged, used to reliably test the NMT feature
181 WB_ENTRY(jboolean, WB_NMTWaitForDataMerge(JNIEnv* env))
182
183 if (!MemTracker::is_on() || MemTracker::shutdown_in_progress()) {
184 return false;
185 }
186
187 return MemTracker::wbtest_wait_for_data_merge();
188 WB_END
189
190 WB_ENTRY(jboolean, WB_NMTIsDetailSupported(JNIEnv* env))
191 return MemTracker::tracking_level() == MemTracker::NMT_detail;
192 WB_END
193
194 #endif // INCLUDE_NMT
195
196 static jmethodID reflected_method_to_jmid(JavaThread* thread, JNIEnv* env, jobject method) {
197 assert(method != NULL, "method should not be null");
198 ThreadToNativeFromVM ttn(thread);
199 return env->FromReflectedMethod(method);
200 }
201
202 WB_ENTRY(void, WB_DeoptimizeAll(JNIEnv* env, jobject o))
203 MutexLockerEx mu(Compile_lock);
204 CodeCache::mark_all_nmethods_for_deoptimization();
205 VM_Deoptimize op;
206 VMThread::execute(&op);
207 WB_END
208
209 WB_ENTRY(jint, WB_DeoptimizeMethod(JNIEnv* env, jobject o, jobject method, jboolean is_osr))
210 jmethodID jmid = reflected_method_to_jmid(thread, env, method);
211 MutexLockerEx mu(Compile_lock);
212 methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
213 int result = 0;
214 nmethod* code;
215 if (is_osr) {
216 int bci = InvocationEntryBci;
217 while ((code = mh->lookup_osr_nmethod_for(bci, CompLevel_none, false)) != NULL) {
218 code->mark_for_deoptimization();
219 ++result;
220 bci = code->osr_entry_bci() + 1;
221 }
222 } else {
223 code = mh->code();
224 }
225 if (code != NULL) {
226 code->mark_for_deoptimization();
227 ++result;
228 }
229 result += CodeCache::mark_for_deoptimization(mh());
230 if (result > 0) {
231 VM_Deoptimize op;
232 VMThread::execute(&op);
233 }
234 return result;
235 WB_END
236
237 WB_ENTRY(jboolean, WB_IsMethodCompiled(JNIEnv* env, jobject o, jobject method, jboolean is_osr))
238 jmethodID jmid = reflected_method_to_jmid(thread, env, method);
239 MutexLockerEx mu(Compile_lock);
240 methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
241 nmethod* code = is_osr ? mh->lookup_osr_nmethod_for(InvocationEntryBci, CompLevel_none, false) : mh->code();
242 if (code == NULL) {
243 return JNI_FALSE;
244 }
245 return (code->is_alive() && !code->is_marked_for_deoptimization());
246 WB_END
247
248 WB_ENTRY(jboolean, WB_IsMethodCompilable(JNIEnv* env, jobject o, jobject method, jint comp_level, jboolean is_osr))
249 jmethodID jmid = reflected_method_to_jmid(thread, env, method);
250 MutexLockerEx mu(Compile_lock);
251 methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
252 if (is_osr) {
253 return CompilationPolicy::can_be_osr_compiled(mh, comp_level);
254 } else {
255 return CompilationPolicy::can_be_compiled(mh, comp_level);
256 }
257 WB_END
258
259 WB_ENTRY(jboolean, WB_IsMethodQueuedForCompilation(JNIEnv* env, jobject o, jobject method))
260 jmethodID jmid = reflected_method_to_jmid(thread, env, method);
261 MutexLockerEx mu(Compile_lock);
262 methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
263 return mh->queued_for_compilation();
264 WB_END
265
266 WB_ENTRY(jint, WB_GetMethodCompilationLevel(JNIEnv* env, jobject o, jobject method, jboolean is_osr))
267 jmethodID jmid = reflected_method_to_jmid(thread, env, method);
268 methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
269 nmethod* code = is_osr ? mh->lookup_osr_nmethod_for(InvocationEntryBci, CompLevel_none, false) : mh->code();
270 return (code != NULL ? code->comp_level() : CompLevel_none);
271 WB_END
272
273 WB_ENTRY(void, WB_MakeMethodNotCompilable(JNIEnv* env, jobject o, jobject method, jint comp_level, jboolean is_osr))
274 jmethodID jmid = reflected_method_to_jmid(thread, env, method);
275 methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
276 if (is_osr) {
277 mh->set_not_osr_compilable(comp_level, true /* report */, "WhiteBox");
278 } else {
279 mh->set_not_compilable(comp_level, true /* report */, "WhiteBox");
280 }
281 WB_END
282
283 WB_ENTRY(jint, WB_GetMethodEntryBci(JNIEnv* env, jobject o, jobject method))
284 jmethodID jmid = reflected_method_to_jmid(thread, env, method);
285 methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
286 nmethod* code = mh->lookup_osr_nmethod_for(InvocationEntryBci, CompLevel_none, false);
287 return (code != NULL && code->is_osr_method() ? code->osr_entry_bci() : InvocationEntryBci);
288 WB_END
289
290 WB_ENTRY(jboolean, WB_TestSetDontInlineMethod(JNIEnv* env, jobject o, jobject method, jboolean value))
291 jmethodID jmid = reflected_method_to_jmid(thread, env, method);
292 methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
293 bool result = mh->dont_inline();
294 mh->set_dont_inline(value == JNI_TRUE);
295 return result;
296 WB_END
297
298 WB_ENTRY(jint, WB_GetCompileQueueSize(JNIEnv* env, jobject o, jint comp_level))
299 if (comp_level == CompLevel_any) {
300 return CompileBroker::queue_size(CompLevel_full_optimization) /* C2 */ +
301 CompileBroker::queue_size(CompLevel_full_profile) /* C1 */;
302 } else {
303 return CompileBroker::queue_size(comp_level);
304 }
305 WB_END
306
307 WB_ENTRY(jboolean, WB_TestSetForceInlineMethod(JNIEnv* env, jobject o, jobject method, jboolean value))
308 jmethodID jmid = reflected_method_to_jmid(thread, env, method);
309 methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
310 bool result = mh->force_inline();
311 mh->set_force_inline(value == JNI_TRUE);
312 return result;
313 WB_END
314
315 WB_ENTRY(jboolean, WB_EnqueueMethodForCompilation(JNIEnv* env, jobject o, jobject method, jint comp_level, jint bci))
316 jmethodID jmid = reflected_method_to_jmid(thread, env, method);
317 methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
318 nmethod* nm = CompileBroker::compile_method(mh, bci, comp_level, mh, mh->invocation_count(), "WhiteBox", THREAD);
319 MutexLockerEx mu(Compile_lock);
320 return (mh->queued_for_compilation() || nm != NULL);
321 WB_END
322
323 WB_ENTRY(void, WB_ClearMethodState(JNIEnv* env, jobject o, jobject method))
324 jmethodID jmid = reflected_method_to_jmid(thread, env, method);
325 methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
326 MutexLockerEx mu(Compile_lock);
327 MethodData* mdo = mh->method_data();
328 MethodCounters* mcs = mh->method_counters();
329
330 if (mdo != NULL) {
331 mdo->init();
332 ResourceMark rm;
333 int arg_count = mdo->method()->size_of_parameters();
334 for (int i = 0; i < arg_count; i++) {
335 mdo->set_arg_modified(i, 0);
336 }
337 }
338
339 mh->clear_not_c1_compilable();
340 mh->clear_not_c2_compilable();
341 mh->clear_not_c2_osr_compilable();
342 NOT_PRODUCT(mh->set_compiled_invocation_count(0));
343 if (mcs != NULL) {
344 mcs->backedge_counter()->init();
345 mcs->invocation_counter()->init();
346 mcs->set_interpreter_invocation_count(0);
347 mcs->set_interpreter_throwout_count(0);
348
349 #ifdef TIERED
350 mcs->set_rate(0.0F);
351 mh->set_prev_event_count(0, THREAD);
352 mh->set_prev_time(0, THREAD);
353 #endif
354 }
355 WB_END
356
357 WB_ENTRY(jboolean, WB_IsInStringTable(JNIEnv* env, jobject o, jstring javaString))
358 ResourceMark rm(THREAD);
359 int len;
360 jchar* name = java_lang_String::as_unicode_string(JNIHandles::resolve(javaString), len, CHECK_false);
361 return (StringTable::lookup(name, len) != NULL);
362 WB_END
363
364 WB_ENTRY(void, WB_FullGC(JNIEnv* env, jobject o))
365 Universe::heap()->collector_policy()->set_should_clear_all_soft_refs(true);
366 Universe::heap()->collect(GCCause::_last_ditch_collection);
367 WB_END
368
369
370 WB_ENTRY(void, WB_ReadReservedMemory(JNIEnv* env, jobject o))
371 // static+volatile in order to force the read to happen
372 // (not be eliminated by the compiler)
373 static char c;
374 static volatile char* p;
375
376 p = os::reserve_memory(os::vm_allocation_granularity(), NULL, 0);
377 if (p == NULL) {
378 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), "Failed to reserve memory");
379 }
380
381 c = *p;
382 WB_END
383
384 //Some convenience methods to deal with objects from java
385 int WhiteBox::offset_for_field(const char* field_name, oop object,
386 Symbol* signature_symbol) {
387 assert(field_name != NULL && strlen(field_name) > 0, "Field name not valid");
388 Thread* THREAD = Thread::current();
389
390 //Get the class of our object
391 Klass* arg_klass = object->klass();
392 //Turn it into an instance-klass
393 InstanceKlass* ik = InstanceKlass::cast(arg_klass);
394
395 //Create symbols to look for in the class
396 TempNewSymbol name_symbol = SymbolTable::lookup(field_name, (int) strlen(field_name),
397 THREAD);
398
399 //To be filled in with an offset of the field we're looking for
400 fieldDescriptor fd;
401
402 Klass* res = ik->find_field(name_symbol, signature_symbol, &fd);
403 if (res == NULL) {
404 tty->print_cr("Invalid layout of %s at %s", ik->external_name(),
405 name_symbol->as_C_string());
406 fatal("Invalid layout of preloaded class");
407 }
408
409 //fetch the field at the offset we've found
410 int dest_offset = fd.offset();
411
412 return dest_offset;
413 }
414
415
416 const char* WhiteBox::lookup_jstring(const char* field_name, oop object) {
417 int offset = offset_for_field(field_name, object,
418 vmSymbols::string_signature());
419 oop string = object->obj_field(offset);
420 if (string == NULL) {
421 return NULL;
422 }
423 const char* ret = java_lang_String::as_utf8_string(string);
424 return ret;
425 }
426
427 bool WhiteBox::lookup_bool(const char* field_name, oop object) {
428 int offset =
429 offset_for_field(field_name, object, vmSymbols::bool_signature());
430 bool ret = (object->bool_field(offset) == JNI_TRUE);
431 return ret;
432 }
433
434
435 #define CC (char*)
436
437 static JNINativeMethod methods[] = {
438 {CC"getObjectAddress", CC"(Ljava/lang/Object;)J", (void*)&WB_GetObjectAddress },
439 {CC"getHeapOopSize", CC"()I", (void*)&WB_GetHeapOopSize },
440 {CC"isClassAlive0", CC"(Ljava/lang/String;)Z", (void*)&WB_IsClassAlive },
441 {CC"parseCommandLine",
442 CC"(Ljava/lang/String;[Lsun/hotspot/parser/DiagnosticCommand;)[Ljava/lang/Object;",
443 (void*) &WB_ParseCommandLine
444 },
445 {CC"getCompressedOopsMaxHeapSize", CC"()J",
446 (void*)&WB_GetCompressedOopsMaxHeapSize},
447 {CC"printHeapSizes", CC"()V", (void*)&WB_PrintHeapSizes },
448 #if INCLUDE_ALL_GCS
449 {CC"g1InConcurrentMark", CC"()Z", (void*)&WB_G1InConcurrentMark},
450 {CC"g1IsHumongous", CC"(Ljava/lang/Object;)Z", (void*)&WB_G1IsHumongous },
451 {CC"g1NumFreeRegions", CC"()J", (void*)&WB_G1NumFreeRegions },
452 {CC"g1RegionSize", CC"()I", (void*)&WB_G1RegionSize },
453 #endif // INCLUDE_ALL_GCS
454 #if INCLUDE_NMT
455 {CC"NMTMalloc", CC"(J)J", (void*)&WB_NMTMalloc },
456 {CC"NMTFree", CC"(J)V", (void*)&WB_NMTFree },
457 {CC"NMTReserveMemory", CC"(J)J", (void*)&WB_NMTReserveMemory },
458 {CC"NMTCommitMemory", CC"(JJ)V", (void*)&WB_NMTCommitMemory },
459 {CC"NMTUncommitMemory", CC"(JJ)V", (void*)&WB_NMTUncommitMemory },
460 {CC"NMTReleaseMemory", CC"(JJ)V", (void*)&WB_NMTReleaseMemory },
461 {CC"NMTWaitForDataMerge", CC"()Z", (void*)&WB_NMTWaitForDataMerge},
462 {CC"NMTIsDetailSupported",CC"()Z", (void*)&WB_NMTIsDetailSupported},
463 #endif // INCLUDE_NMT
464 {CC"deoptimizeAll", CC"()V", (void*)&WB_DeoptimizeAll },
465 {CC"deoptimizeMethod", CC"(Ljava/lang/reflect/Executable;Z)I",
466 (void*)&WB_DeoptimizeMethod },
467 {CC"isMethodCompiled", CC"(Ljava/lang/reflect/Executable;Z)Z",
468 (void*)&WB_IsMethodCompiled },
469 {CC"isMethodCompilable", CC"(Ljava/lang/reflect/Executable;IZ)Z",
470 (void*)&WB_IsMethodCompilable},
471 {CC"isMethodQueuedForCompilation",
472 CC"(Ljava/lang/reflect/Executable;)Z", (void*)&WB_IsMethodQueuedForCompilation},
473 {CC"makeMethodNotCompilable",
474 CC"(Ljava/lang/reflect/Executable;IZ)V", (void*)&WB_MakeMethodNotCompilable},
475 {CC"testSetDontInlineMethod",
476 CC"(Ljava/lang/reflect/Executable;Z)Z", (void*)&WB_TestSetDontInlineMethod},
477 {CC"getMethodCompilationLevel",
478 CC"(Ljava/lang/reflect/Executable;Z)I", (void*)&WB_GetMethodCompilationLevel},
479 {CC"getMethodEntryBci",
480 CC"(Ljava/lang/reflect/Executable;)I", (void*)&WB_GetMethodEntryBci},
481 {CC"getCompileQueueSize",
482 CC"(I)I", (void*)&WB_GetCompileQueueSize},
483 {CC"testSetForceInlineMethod",
484 CC"(Ljava/lang/reflect/Executable;Z)Z", (void*)&WB_TestSetForceInlineMethod},
485 {CC"enqueueMethodForCompilation",
486 CC"(Ljava/lang/reflect/Executable;II)Z", (void*)&WB_EnqueueMethodForCompilation},
487 {CC"clearMethodState",
488 CC"(Ljava/lang/reflect/Executable;)V", (void*)&WB_ClearMethodState},
489 {CC"isInStringTable", CC"(Ljava/lang/String;)Z", (void*)&WB_IsInStringTable },
490 {CC"fullGC", CC"()V", (void*)&WB_FullGC },
491 {CC"readReservedMemory", CC"()V", (void*)&WB_ReadReservedMemory },
492 };
493
494 #undef CC
495
496 JVM_ENTRY(void, JVM_RegisterWhiteBoxMethods(JNIEnv* env, jclass wbclass))
497 {
498 if (WhiteBoxAPI) {
499 // Make sure that wbclass is loaded by the null classloader
500 instanceKlassHandle ikh = instanceKlassHandle(JNIHandles::resolve(wbclass)->klass());
501 Handle loader(ikh->class_loader());
502 if (loader.is_null()) {
503 ResourceMark rm;
504 ThreadToNativeFromVM ttnfv(thread); // can't be in VM when we call JNI
505 bool result = true;
506 // one by one registration natives for exception catching
507 jclass exceptionKlass = env->FindClass(vmSymbols::java_lang_NoSuchMethodError()->as_C_string());
508 for (int i = 0, n = sizeof(methods) / sizeof(methods[0]); i < n; ++i) {
509 if (env->RegisterNatives(wbclass, methods + i, 1) != 0) {
510 result = false;
511 if (env->ExceptionCheck() && env->IsInstanceOf(env->ExceptionOccurred(), exceptionKlass)) {
512 // j.l.NoSuchMethodError is thrown when a method can't be found or a method is not native
513 // ignoring the exception
514 tty->print_cr("Warning: 'NoSuchMethodError' on register of sun.hotspot.WhiteBox::%s%s", methods[i].name, methods[i].signature);
515 env->ExceptionClear();
516 } else {
517 // register is failed w/o exception or w/ unexpected exception
518 tty->print_cr("Warning: unexpected error on register of sun.hotspot.WhiteBox::%s%s. All methods will be unregistered", methods[i].name, methods[i].signature);
519 env->UnregisterNatives(wbclass);
520 break;
521 }
522 }
523 }
524
525 if (result) {
526 WhiteBox::set_used();
527 }
528 }
529 }
530 }
531 JVM_END