1 /*
2 * Copyright (c) 2012, 2014, 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 <new>
28
29 #include "code/codeCache.hpp"
30 #include "memory/metadataFactory.hpp"
31 #include "memory/universe.hpp"
32 #include "oops/oop.inline.hpp"
33
34 #include "classfile/stringTable.hpp"
35 #include "classfile/classLoaderData.hpp"
36
37 #include "prims/whitebox.hpp"
38 #include "prims/wbtestmethods/parserTests.hpp"
39
40 #include "runtime/thread.hpp"
41 #include "runtime/arguments.hpp"
42 #include "runtime/deoptimization.hpp"
43 #include "runtime/interfaceSupport.hpp"
44 #include "runtime/os.hpp"
45 #include "runtime/vm_version.hpp"
46 #include "runtime/sweeper.hpp"
47
48 #include "utilities/array.hpp"
49 #include "utilities/debug.hpp"
50 #include "utilities/macros.hpp"
51 #include "utilities/exceptions.hpp"
52
53 #if INCLUDE_ALL_GCS
54 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.inline.hpp"
55 #include "gc_implementation/g1/concurrentMark.hpp"
56 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
57 #include "gc_implementation/g1/heapRegionRemSet.hpp"
58 #endif // INCLUDE_ALL_GCS
59
60 #if INCLUDE_NMT
61 #include "services/mallocSiteTable.hpp"
62 #include "services/memTracker.hpp"
63 #include "utilities/nativeCallStack.hpp"
64 #endif // INCLUDE_NMT
65
66 #include "compiler/compileBroker.hpp"
67 #include "jvmtifiles/jvmtiEnv.hpp"
68 #include "runtime/compilationPolicy.hpp"
69
70 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
71
72 #define SIZE_T_MAX_VALUE ((size_t) -1)
73
74 bool WhiteBox::_used = false;
75 volatile bool WhiteBox::compilation_locked = false;
76
77 WB_ENTRY(jlong, WB_GetObjectAddress(JNIEnv* env, jobject o, jobject obj))
78 return (jlong)(void*)JNIHandles::resolve(obj);
79 WB_END
80
81 WB_ENTRY(jint, WB_GetHeapOopSize(JNIEnv* env, jobject o))
82 return heapOopSize;
83 WB_END
84
85
86 class WBIsKlassAliveClosure : public KlassClosure {
87 Symbol* _name;
88 bool _found;
89 public:
90 WBIsKlassAliveClosure(Symbol* name) : _name(name), _found(false) {}
91
92 void do_klass(Klass* k) {
93 if (_found) return;
94 Symbol* ksym = k->name();
95 if (ksym->fast_compare(_name) == 0) {
96 _found = true;
97 }
98 }
99
100 bool found() const {
101 return _found;
102 }
103 };
104
105 WB_ENTRY(jboolean, WB_IsClassAlive(JNIEnv* env, jobject target, jstring name))
106 Handle h_name = JNIHandles::resolve(name);
107 if (h_name.is_null()) return false;
108 Symbol* sym = java_lang_String::as_symbol(h_name, CHECK_false);
109 TempNewSymbol tsym(sym); // Make sure to decrement reference count on sym on return
110
111 WBIsKlassAliveClosure closure(sym);
112 ClassLoaderDataGraph::classes_do(&closure);
113
114 return closure.found();
115 WB_END
116
117 WB_ENTRY(void, WB_AddToBootstrapClassLoaderSearch(JNIEnv* env, jobject o, jstring segment)) {
118 #if INCLUDE_JVMTI
119 ResourceMark rm;
120 const char* seg = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(segment));
121 JvmtiEnv* jvmti_env = JvmtiEnv::create_a_jvmti(JVMTI_VERSION);
122 jvmtiError err = jvmti_env->AddToBootstrapClassLoaderSearch(seg);
123 assert(err == JVMTI_ERROR_NONE, "must not fail");
124 #endif
125 }
126 WB_END
127
128 WB_ENTRY(void, WB_AddToSystemClassLoaderSearch(JNIEnv* env, jobject o, jstring segment)) {
129 #if INCLUDE_JVMTI
130 ResourceMark rm;
131 const char* seg = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(segment));
132 JvmtiEnv* jvmti_env = JvmtiEnv::create_a_jvmti(JVMTI_VERSION);
133 jvmtiError err = jvmti_env->AddToSystemClassLoaderSearch(seg);
134 assert(err == JVMTI_ERROR_NONE, "must not fail");
135 #endif
136 }
137 WB_END
138
139
140 WB_ENTRY(jlong, WB_GetCompressedOopsMaxHeapSize(JNIEnv* env, jobject o)) {
141 return (jlong)Arguments::max_heap_for_compressed_oops();
142 }
143 WB_END
144
145 WB_ENTRY(void, WB_PrintHeapSizes(JNIEnv* env, jobject o)) {
146 CollectorPolicy * p = Universe::heap()->collector_policy();
147 gclog_or_tty->print_cr("Minimum heap "SIZE_FORMAT" Initial heap "
148 SIZE_FORMAT" Maximum heap "SIZE_FORMAT" Space alignment "SIZE_FORMAT" Heap alignment "SIZE_FORMAT,
149 p->min_heap_byte_size(), p->initial_heap_byte_size(), p->max_heap_byte_size(),
150 p->space_alignment(), p->heap_alignment());
151 }
152 WB_END
153
154 #ifndef PRODUCT
155 // Forward declaration
156 void TestReservedSpace_test();
157 void TestReserveMemorySpecial_test();
158 void TestVirtualSpace_test();
159 void TestMetaspaceAux_test();
160 #endif
161
162 WB_ENTRY(void, WB_RunMemoryUnitTests(JNIEnv* env, jobject o))
163 #ifndef PRODUCT
164 TestReservedSpace_test();
165 TestReserveMemorySpecial_test();
166 TestVirtualSpace_test();
167 TestMetaspaceAux_test();
168 #endif
169 WB_END
170
171 WB_ENTRY(void, WB_ReadFromNoaccessArea(JNIEnv* env, jobject o))
172 size_t granularity = os::vm_allocation_granularity();
173 ReservedHeapSpace rhs(100 * granularity, granularity, false, NULL);
174 VirtualSpace vs;
175 vs.initialize(rhs, 50 * granularity);
176
177 //Check if constraints are complied
178 if (!( UseCompressedOops && rhs.base() != NULL &&
179 Universe::narrow_oop_base() != NULL &&
180 Universe::narrow_oop_use_implicit_null_checks() )) {
181 tty->print_cr("WB_ReadFromNoaccessArea method is useless:\n "
182 "\tUseCompressedOops is %d\n"
183 "\trhs.base() is "PTR_FORMAT"\n"
184 "\tUniverse::narrow_oop_base() is "PTR_FORMAT"\n"
185 "\tUniverse::narrow_oop_use_implicit_null_checks() is %d",
186 UseCompressedOops,
187 rhs.base(),
188 Universe::narrow_oop_base(),
189 Universe::narrow_oop_use_implicit_null_checks());
190 return;
191 }
192 tty->print_cr("Reading from no access area... ");
193 tty->print_cr("*(vs.low_boundary() - rhs.noaccess_prefix() / 2 ) = %c",
194 *(vs.low_boundary() - rhs.noaccess_prefix() / 2 ));
195 WB_END
196
197 static jint wb_stress_virtual_space_resize(size_t reserved_space_size,
198 size_t magnitude, size_t iterations) {
199 size_t granularity = os::vm_allocation_granularity();
200 ReservedHeapSpace rhs(reserved_space_size * granularity, granularity, false, NULL);
201 VirtualSpace vs;
202 if (!vs.initialize(rhs, 0)) {
203 tty->print_cr("Failed to initialize VirtualSpace. Can't proceed.");
204 return 3;
205 }
206
207 long seed = os::random();
208 tty->print_cr("Random seed is %ld", seed);
209 os::init_random(seed);
210
211 for (size_t i = 0; i < iterations; i++) {
212
213 // Whether we will shrink or grow
214 bool shrink = os::random() % 2L == 0;
215
216 // Get random delta to resize virtual space
217 size_t delta = (size_t)os::random() % magnitude;
218
219 // If we are about to shrink virtual space below zero, then expand instead
220 if (shrink && vs.committed_size() < delta) {
221 shrink = false;
222 }
223
224 // Resizing by delta
225 if (shrink) {
226 vs.shrink_by(delta);
227 } else {
228 // If expanding fails expand_by will silently return false
229 vs.expand_by(delta, true);
230 }
231 }
232 return 0;
233 }
234
235 WB_ENTRY(jint, WB_StressVirtualSpaceResize(JNIEnv* env, jobject o,
236 jlong reserved_space_size, jlong magnitude, jlong iterations))
237 tty->print_cr("reservedSpaceSize="JLONG_FORMAT", magnitude="JLONG_FORMAT", "
238 "iterations="JLONG_FORMAT"\n", reserved_space_size, magnitude,
239 iterations);
240 if (reserved_space_size < 0 || magnitude < 0 || iterations < 0) {
241 tty->print_cr("One of variables printed above is negative. Can't proceed.\n");
242 return 1;
243 }
244
245 // sizeof(size_t) depends on whether OS is 32bit or 64bit. sizeof(jlong) is
246 // always 8 byte. That's why we should avoid overflow in case of 32bit platform.
247 if (sizeof(size_t) < sizeof(jlong)) {
248 jlong size_t_max_value = (jlong) SIZE_T_MAX_VALUE;
249 if (reserved_space_size > size_t_max_value || magnitude > size_t_max_value
250 || iterations > size_t_max_value) {
251 tty->print_cr("One of variables printed above overflows size_t. Can't proceed.\n");
252 return 2;
253 }
254 }
255
256 return wb_stress_virtual_space_resize((size_t) reserved_space_size,
257 (size_t) magnitude, (size_t) iterations);
258 WB_END
259
260 WB_ENTRY(jboolean, WB_isObjectInOldGen(JNIEnv* env, jobject o, jobject obj))
261 oop p = JNIHandles::resolve(obj);
262 #if INCLUDE_ALL_GCS
263 if (UseG1GC) {
264 G1CollectedHeap* g1 = G1CollectedHeap::heap();
265 const HeapRegion* hr = g1->heap_region_containing(p);
266 if (hr == NULL) {
267 return false;
268 }
269 return !(hr->is_young());
270 } else if (UseParallelGC) {
271 ParallelScavengeHeap* psh = ParallelScavengeHeap::heap();
272 return !psh->is_in_young(p);
273 }
274 #endif // INCLUDE_ALL_GCS
275 GenCollectedHeap* gch = GenCollectedHeap::heap();
276 return !gch->is_in_young(p);
277 WB_END
278
279 WB_ENTRY(jlong, WB_GetObjectSize(JNIEnv* env, jobject o, jobject obj))
280 oop p = JNIHandles::resolve(obj);
281 return p->size() * HeapWordSize;
282 WB_END
283
284 #if INCLUDE_ALL_GCS
285 WB_ENTRY(jboolean, WB_G1IsHumongous(JNIEnv* env, jobject o, jobject obj))
286 G1CollectedHeap* g1 = G1CollectedHeap::heap();
287 oop result = JNIHandles::resolve(obj);
288 const HeapRegion* hr = g1->heap_region_containing(result);
289 return hr->is_humongous();
290 WB_END
291
292 WB_ENTRY(jlong, WB_G1NumFreeRegions(JNIEnv* env, jobject o))
293 G1CollectedHeap* g1 = G1CollectedHeap::heap();
294 size_t nr = g1->num_free_regions();
295 return (jlong)nr;
296 WB_END
297
298 WB_ENTRY(jboolean, WB_G1InConcurrentMark(JNIEnv* env, jobject o))
299 G1CollectedHeap* g1 = G1CollectedHeap::heap();
300 ConcurrentMark* cm = g1->concurrent_mark();
301 return cm->concurrent_marking_in_progress();
302 WB_END
303
304 WB_ENTRY(jint, WB_G1RegionSize(JNIEnv* env, jobject o))
305 return (jint)HeapRegion::GrainBytes;
306 WB_END
307 #endif // INCLUDE_ALL_GCS
308
309 #if INCLUDE_NMT
310 // Alloc memory using the test memory type so that we can use that to see if
311 // NMT picks it up correctly
312 WB_ENTRY(jlong, WB_NMTMalloc(JNIEnv* env, jobject o, jlong size))
313 jlong addr = 0;
314 addr = (jlong)(uintptr_t)os::malloc(size, mtTest);
315 return addr;
316 WB_END
317
318 // Alloc memory with pseudo call stack. The test can create psudo malloc
319 // allocation site to stress the malloc tracking.
320 WB_ENTRY(jlong, WB_NMTMallocWithPseudoStack(JNIEnv* env, jobject o, jlong size, jint pseudo_stack))
321 address pc = (address)(size_t)pseudo_stack;
322 NativeCallStack stack(&pc, 1);
323 return (jlong)(uintptr_t)os::malloc(size, mtTest, stack);
324 WB_END
325
326 // Free the memory allocated by NMTAllocTest
327 WB_ENTRY(void, WB_NMTFree(JNIEnv* env, jobject o, jlong mem))
328 os::free((void*)(uintptr_t)mem, mtTest);
329 WB_END
330
331 WB_ENTRY(jlong, WB_NMTReserveMemory(JNIEnv* env, jobject o, jlong size))
332 jlong addr = 0;
333
334 addr = (jlong)(uintptr_t)os::reserve_memory(size);
335 MemTracker::record_virtual_memory_type((address)addr, mtTest);
336
337 return addr;
338 WB_END
339
340 WB_ENTRY(void, WB_NMTCommitMemory(JNIEnv* env, jobject o, jlong addr, jlong size))
341 os::commit_memory((char *)(uintptr_t)addr, size, !ExecMem);
342 MemTracker::record_virtual_memory_type((address)(uintptr_t)addr, mtTest);
343 WB_END
344
345 WB_ENTRY(void, WB_NMTUncommitMemory(JNIEnv* env, jobject o, jlong addr, jlong size))
346 os::uncommit_memory((char *)(uintptr_t)addr, size);
347 WB_END
348
349 WB_ENTRY(void, WB_NMTReleaseMemory(JNIEnv* env, jobject o, jlong addr, jlong size))
350 os::release_memory((char *)(uintptr_t)addr, size);
351 WB_END
352
353 WB_ENTRY(jboolean, WB_NMTIsDetailSupported(JNIEnv* env))
354 return MemTracker::tracking_level() == NMT_detail;
355 WB_END
356
357 WB_ENTRY(jboolean, WB_NMTChangeTrackingLevel(JNIEnv* env))
358 // Test that we can downgrade NMT levels but not upgrade them.
359 if (MemTracker::tracking_level() == NMT_off) {
360 MemTracker::transition_to(NMT_off);
361 return MemTracker::tracking_level() == NMT_off;
362 } else {
363 assert(MemTracker::tracking_level() == NMT_detail, "Should start out as detail tracking");
364 MemTracker::transition_to(NMT_summary);
365 assert(MemTracker::tracking_level() == NMT_summary, "Should be summary now");
366
367 // Can't go to detail once NMT is set to summary.
368 MemTracker::transition_to(NMT_detail);
369 assert(MemTracker::tracking_level() == NMT_summary, "Should still be summary now");
370
371 // Shutdown sets tracking level to minimal.
372 MemTracker::shutdown();
373 assert(MemTracker::tracking_level() == NMT_minimal, "Should be minimal now");
374
375 // Once the tracking level is minimal, we cannot increase to summary.
376 // The code ignores this request instead of asserting because if the malloc site
377 // table overflows in another thread, it tries to change the code to summary.
378 MemTracker::transition_to(NMT_summary);
379 assert(MemTracker::tracking_level() == NMT_minimal, "Should still be minimal now");
380
381 // Really can never go up to detail, verify that the code would never do this.
382 MemTracker::transition_to(NMT_detail);
383 assert(MemTracker::tracking_level() == NMT_minimal, "Should still be minimal now");
384 return MemTracker::tracking_level() == NMT_minimal;
385 }
386 WB_END
387
388 WB_ENTRY(jint, WB_NMTGetHashSize(JNIEnv* env, jobject o))
389 int hash_size = MallocSiteTable::hash_buckets();
390 assert(hash_size > 0, "NMT hash_size should be > 0");
391 return (jint)hash_size;
392 WB_END
393 #endif // INCLUDE_NMT
394
395 static jmethodID reflected_method_to_jmid(JavaThread* thread, JNIEnv* env, jobject method) {
396 assert(method != NULL, "method should not be null");
397 ThreadToNativeFromVM ttn(thread);
398 return env->FromReflectedMethod(method);
399 }
400
401 WB_ENTRY(void, WB_DeoptimizeAll(JNIEnv* env, jobject o))
402 MutexLockerEx mu(Compile_lock);
403 CodeCache::mark_all_nmethods_for_deoptimization();
404 VM_Deoptimize op;
405 VMThread::execute(&op);
406 WB_END
407
408 WB_ENTRY(jint, WB_DeoptimizeMethod(JNIEnv* env, jobject o, jobject method, jboolean is_osr))
409 jmethodID jmid = reflected_method_to_jmid(thread, env, method);
410 int result = 0;
411 CHECK_JNI_EXCEPTION_(env, result);
412 MutexLockerEx mu(Compile_lock);
413 methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
414 if (is_osr) {
415 result += mh->mark_osr_nmethods();
416 } else if (mh->code() != NULL) {
417 mh->code()->mark_for_deoptimization();
418 ++result;
419 }
420 result += CodeCache::mark_for_deoptimization(mh());
421 if (result > 0) {
422 VM_Deoptimize op;
423 VMThread::execute(&op);
424 }
425 return result;
426 WB_END
427
428 WB_ENTRY(jboolean, WB_IsMethodCompiled(JNIEnv* env, jobject o, jobject method, jboolean is_osr))
429 jmethodID jmid = reflected_method_to_jmid(thread, env, method);
430 CHECK_JNI_EXCEPTION_(env, JNI_FALSE);
431 MutexLockerEx mu(Compile_lock);
432 methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
433 nmethod* code = is_osr ? mh->lookup_osr_nmethod_for(InvocationEntryBci, CompLevel_none, false) : mh->code();
434 if (code == NULL) {
435 return JNI_FALSE;
436 }
437 return (code->is_alive() && !code->is_marked_for_deoptimization());
438 WB_END
439
440 WB_ENTRY(jboolean, WB_IsMethodCompilable(JNIEnv* env, jobject o, jobject method, jint comp_level, jboolean is_osr))
441 jmethodID jmid = reflected_method_to_jmid(thread, env, method);
442 CHECK_JNI_EXCEPTION_(env, JNI_FALSE);
443 MutexLockerEx mu(Compile_lock);
444 methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
445 if (is_osr) {
446 return CompilationPolicy::can_be_osr_compiled(mh, comp_level);
447 } else {
448 return CompilationPolicy::can_be_compiled(mh, comp_level);
449 }
450 WB_END
451
452 WB_ENTRY(jboolean, WB_IsMethodQueuedForCompilation(JNIEnv* env, jobject o, jobject method))
453 jmethodID jmid = reflected_method_to_jmid(thread, env, method);
454 CHECK_JNI_EXCEPTION_(env, JNI_FALSE);
455 MutexLockerEx mu(Compile_lock);
456 methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
457 return mh->queued_for_compilation();
458 WB_END
459
460 WB_ENTRY(jint, WB_GetMethodCompilationLevel(JNIEnv* env, jobject o, jobject method, jboolean is_osr))
461 jmethodID jmid = reflected_method_to_jmid(thread, env, method);
462 CHECK_JNI_EXCEPTION_(env, CompLevel_none);
463 methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
464 nmethod* code = is_osr ? mh->lookup_osr_nmethod_for(InvocationEntryBci, CompLevel_none, false) : mh->code();
465 return (code != NULL ? code->comp_level() : CompLevel_none);
466 WB_END
467
468 WB_ENTRY(void, WB_MakeMethodNotCompilable(JNIEnv* env, jobject o, jobject method, jint comp_level, jboolean is_osr))
469 jmethodID jmid = reflected_method_to_jmid(thread, env, method);
470 CHECK_JNI_EXCEPTION(env);
471 methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
472 if (is_osr) {
473 mh->set_not_osr_compilable(comp_level, true /* report */, "WhiteBox");
474 } else {
475 mh->set_not_compilable(comp_level, true /* report */, "WhiteBox");
476 }
477 WB_END
478
479 WB_ENTRY(jint, WB_GetMethodEntryBci(JNIEnv* env, jobject o, jobject method))
480 jmethodID jmid = reflected_method_to_jmid(thread, env, method);
481 CHECK_JNI_EXCEPTION_(env, InvocationEntryBci);
482 methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
483 nmethod* code = mh->lookup_osr_nmethod_for(InvocationEntryBci, CompLevel_none, false);
484 return (code != NULL && code->is_osr_method() ? code->osr_entry_bci() : InvocationEntryBci);
485 WB_END
486
487 WB_ENTRY(jboolean, WB_TestSetDontInlineMethod(JNIEnv* env, jobject o, jobject method, jboolean value))
488 jmethodID jmid = reflected_method_to_jmid(thread, env, method);
489 CHECK_JNI_EXCEPTION_(env, JNI_FALSE);
490 methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
491 bool result = mh->dont_inline();
492 mh->set_dont_inline(value == JNI_TRUE);
493 return result;
494 WB_END
495
496 WB_ENTRY(jint, WB_GetCompileQueueSize(JNIEnv* env, jobject o, jint comp_level))
497 if (comp_level == CompLevel_any) {
498 return CompileBroker::queue_size(CompLevel_full_optimization) /* C2 */ +
499 CompileBroker::queue_size(CompLevel_full_profile) /* C1 */;
500 } else {
501 return CompileBroker::queue_size(comp_level);
502 }
503 WB_END
504
505 WB_ENTRY(jboolean, WB_TestSetForceInlineMethod(JNIEnv* env, jobject o, jobject method, jboolean value))
506 jmethodID jmid = reflected_method_to_jmid(thread, env, method);
507 CHECK_JNI_EXCEPTION_(env, JNI_FALSE);
508 methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
509 bool result = mh->force_inline();
510 mh->set_force_inline(value == JNI_TRUE);
511 return result;
512 WB_END
513
514 WB_ENTRY(jboolean, WB_EnqueueMethodForCompilation(JNIEnv* env, jobject o, jobject method, jint comp_level, jint bci))
515 jmethodID jmid = reflected_method_to_jmid(thread, env, method);
516 CHECK_JNI_EXCEPTION_(env, JNI_FALSE);
517 methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
518 nmethod* nm = CompileBroker::compile_method(mh, bci, comp_level, mh, mh->invocation_count(), "WhiteBox", THREAD);
519 MutexLockerEx mu(Compile_lock);
520 return (mh->queued_for_compilation() || nm != NULL);
521 WB_END
522
523 class VM_WhiteBoxOperation : public VM_Operation {
524 public:
525 VM_WhiteBoxOperation() { }
526 VMOp_Type type() const { return VMOp_WhiteBoxOperation; }
527 bool allow_nested_vm_operations() const { return true; }
528 };
529
530 class AlwaysFalseClosure : public BoolObjectClosure {
531 public:
532 bool do_object_b(oop p) { return false; }
533 };
534
535 static AlwaysFalseClosure always_false;
536
537 WB_ENTRY(void, WB_ClearMethodState(JNIEnv* env, jobject o, jobject method))
538 jmethodID jmid = reflected_method_to_jmid(thread, env, method);
539 CHECK_JNI_EXCEPTION(env);
540 methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
541 MutexLockerEx mu(Compile_lock);
542 MethodData* mdo = mh->method_data();
543 MethodCounters* mcs = mh->method_counters();
544
545 if (mdo != NULL) {
546 mdo->init();
547 ResourceMark rm;
548 int arg_count = mdo->method()->size_of_parameters();
549 for (int i = 0; i < arg_count; i++) {
550 mdo->set_arg_modified(i, 0);
551 }
552 MutexLockerEx mu(mdo->extra_data_lock());
553 mdo->clean_method_data(&always_false);
554 }
555
556 mh->clear_not_c1_compilable();
557 mh->clear_not_c2_compilable();
558 mh->clear_not_c2_osr_compilable();
559 NOT_PRODUCT(mh->set_compiled_invocation_count(0));
560 if (mcs != NULL) {
561 mcs->backedge_counter()->init();
562 mcs->invocation_counter()->init();
563 mcs->set_interpreter_invocation_count(0);
564 mcs->set_interpreter_throwout_count(0);
565
566 #ifdef TIERED
567 mcs->set_rate(0.0F);
568 mh->set_prev_event_count(0);
569 mh->set_prev_time(0);
570 #endif
571 }
572 WB_END
573
574 template <typename T>
575 static bool GetVMFlag(JavaThread* thread, JNIEnv* env, jstring name, T* value, bool (*TAt)(const char*, T*, bool, bool)) {
576 if (name == NULL) {
577 return false;
578 }
579 ThreadToNativeFromVM ttnfv(thread); // can't be in VM when we call JNI
580 const char* flag_name = env->GetStringUTFChars(name, NULL);
581 bool result = (*TAt)(flag_name, value, true, true);
582 env->ReleaseStringUTFChars(name, flag_name);
583 return result;
584 }
585
586 template <typename T>
587 static bool SetVMFlag(JavaThread* thread, JNIEnv* env, jstring name, T* value, bool (*TAtPut)(const char*, T*, Flag::Flags)) {
588 if (name == NULL) {
589 return false;
590 }
591 ThreadToNativeFromVM ttnfv(thread); // can't be in VM when we call JNI
592 const char* flag_name = env->GetStringUTFChars(name, NULL);
593 bool result = (*TAtPut)(flag_name, value, Flag::INTERNAL);
594 env->ReleaseStringUTFChars(name, flag_name);
595 return result;
596 }
597
598 template <typename T>
599 static jobject box(JavaThread* thread, JNIEnv* env, Symbol* name, Symbol* sig, T value) {
600 ResourceMark rm(thread);
601 jclass clazz = env->FindClass(name->as_C_string());
602 CHECK_JNI_EXCEPTION_(env, NULL);
603 jmethodID methodID = env->GetStaticMethodID(clazz,
604 vmSymbols::valueOf_name()->as_C_string(),
605 sig->as_C_string());
606 CHECK_JNI_EXCEPTION_(env, NULL);
607 jobject result = env->CallStaticObjectMethod(clazz, methodID, value);
608 CHECK_JNI_EXCEPTION_(env, NULL);
609 return result;
610 }
611
612 static jobject booleanBox(JavaThread* thread, JNIEnv* env, jboolean value) {
613 return box(thread, env, vmSymbols::java_lang_Boolean(), vmSymbols::Boolean_valueOf_signature(), value);
614 }
615 static jobject integerBox(JavaThread* thread, JNIEnv* env, jint value) {
616 return box(thread, env, vmSymbols::java_lang_Integer(), vmSymbols::Integer_valueOf_signature(), value);
617 }
618 static jobject longBox(JavaThread* thread, JNIEnv* env, jlong value) {
619 return box(thread, env, vmSymbols::java_lang_Long(), vmSymbols::Long_valueOf_signature(), value);
620 }
621 /* static jobject floatBox(JavaThread* thread, JNIEnv* env, jfloat value) {
622 return box(thread, env, vmSymbols::java_lang_Float(), vmSymbols::Float_valueOf_signature(), value);
623 }*/
624 static jobject doubleBox(JavaThread* thread, JNIEnv* env, jdouble value) {
625 return box(thread, env, vmSymbols::java_lang_Double(), vmSymbols::Double_valueOf_signature(), value);
626 }
627
628 static Flag* getVMFlag(JavaThread* thread, JNIEnv* env, jstring name) {
629 ThreadToNativeFromVM ttnfv(thread); // can't be in VM when we call JNI
630 const char* flag_name = env->GetStringUTFChars(name, NULL);
631 Flag* result = Flag::find_flag(flag_name, strlen(flag_name), true, true);
632 env->ReleaseStringUTFChars(name, flag_name);
633 return result;
634 }
635
636 WB_ENTRY(jboolean, WB_IsConstantVMFlag(JNIEnv* env, jobject o, jstring name))
637 Flag* flag = getVMFlag(thread, env, name);
638 return (flag != NULL) && flag->is_constant_in_binary();
639 WB_END
640
641 WB_ENTRY(jboolean, WB_IsLockedVMFlag(JNIEnv* env, jobject o, jstring name))
642 Flag* flag = getVMFlag(thread, env, name);
643 return (flag != NULL) && !(flag->is_unlocked() || flag->is_unlocker());
644 WB_END
645
646 WB_ENTRY(jobject, WB_GetBooleanVMFlag(JNIEnv* env, jobject o, jstring name))
647 bool result;
648 if (GetVMFlag <bool> (thread, env, name, &result, &CommandLineFlags::boolAt)) {
649 ThreadToNativeFromVM ttnfv(thread); // can't be in VM when we call JNI
650 return booleanBox(thread, env, result);
651 }
652 return NULL;
653 WB_END
654
655 WB_ENTRY(jobject, WB_GetIntxVMFlag(JNIEnv* env, jobject o, jstring name))
656 intx result;
657 if (GetVMFlag <intx> (thread, env, name, &result, &CommandLineFlags::intxAt)) {
658 ThreadToNativeFromVM ttnfv(thread); // can't be in VM when we call JNI
659 return longBox(thread, env, result);
660 }
661 return NULL;
662 WB_END
663
664 WB_ENTRY(jobject, WB_GetUintxVMFlag(JNIEnv* env, jobject o, jstring name))
665 uintx result;
666 if (GetVMFlag <uintx> (thread, env, name, &result, &CommandLineFlags::uintxAt)) {
667 ThreadToNativeFromVM ttnfv(thread); // can't be in VM when we call JNI
668 return longBox(thread, env, result);
669 }
670 return NULL;
671 WB_END
672
673 WB_ENTRY(jobject, WB_GetUint64VMFlag(JNIEnv* env, jobject o, jstring name))
674 uint64_t result;
675 if (GetVMFlag <uint64_t> (thread, env, name, &result, &CommandLineFlags::uint64_tAt)) {
676 ThreadToNativeFromVM ttnfv(thread); // can't be in VM when we call JNI
677 return longBox(thread, env, result);
678 }
679 return NULL;
680 WB_END
681
682 WB_ENTRY(jobject, WB_GetSizeTVMFlag(JNIEnv* env, jobject o, jstring name))
683 uintx result;
684 if (GetVMFlag <size_t> (thread, env, name, &result, &CommandLineFlags::size_tAt)) {
685 ThreadToNativeFromVM ttnfv(thread); // can't be in VM when we call JNI
686 return longBox(thread, env, result);
687 }
688 return NULL;
689 WB_END
690
691 WB_ENTRY(jobject, WB_GetDoubleVMFlag(JNIEnv* env, jobject o, jstring name))
692 double result;
693 if (GetVMFlag <double> (thread, env, name, &result, &CommandLineFlags::doubleAt)) {
694 ThreadToNativeFromVM ttnfv(thread); // can't be in VM when we call JNI
695 return doubleBox(thread, env, result);
696 }
697 return NULL;
698 WB_END
699
700 WB_ENTRY(jstring, WB_GetStringVMFlag(JNIEnv* env, jobject o, jstring name))
701 ccstr ccstrResult;
702 if (GetVMFlag <ccstr> (thread, env, name, &ccstrResult, &CommandLineFlags::ccstrAt)) {
703 ThreadToNativeFromVM ttnfv(thread); // can't be in VM when we call JNI
704 jstring result = env->NewStringUTF(ccstrResult);
705 CHECK_JNI_EXCEPTION_(env, NULL);
706 return result;
707 }
708 return NULL;
709 WB_END
710
711 WB_ENTRY(void, WB_SetBooleanVMFlag(JNIEnv* env, jobject o, jstring name, jboolean value))
712 bool result = value == JNI_TRUE ? true : false;
713 SetVMFlag <bool> (thread, env, name, &result, &CommandLineFlags::boolAtPut);
714 WB_END
715
716 WB_ENTRY(void, WB_SetIntxVMFlag(JNIEnv* env, jobject o, jstring name, jlong value))
717 intx result = value;
718 SetVMFlag <intx> (thread, env, name, &result, &CommandLineFlags::intxAtPut);
719 WB_END
720
721 WB_ENTRY(void, WB_SetUintxVMFlag(JNIEnv* env, jobject o, jstring name, jlong value))
722 uintx result = value;
723 SetVMFlag <uintx> (thread, env, name, &result, &CommandLineFlags::uintxAtPut);
724 WB_END
725
726 WB_ENTRY(void, WB_SetUint64VMFlag(JNIEnv* env, jobject o, jstring name, jlong value))
727 uint64_t result = value;
728 SetVMFlag <uint64_t> (thread, env, name, &result, &CommandLineFlags::uint64_tAtPut);
729 WB_END
730
731 WB_ENTRY(void, WB_SetSizeTVMFlag(JNIEnv* env, jobject o, jstring name, jlong value))
732 size_t result = value;
733 SetVMFlag <size_t> (thread, env, name, &result, &CommandLineFlags::size_tAtPut);
734 WB_END
735
736 WB_ENTRY(void, WB_SetDoubleVMFlag(JNIEnv* env, jobject o, jstring name, jdouble value))
737 double result = value;
738 SetVMFlag <double> (thread, env, name, &result, &CommandLineFlags::doubleAtPut);
739 WB_END
740
741 WB_ENTRY(void, WB_SetStringVMFlag(JNIEnv* env, jobject o, jstring name, jstring value))
742 ThreadToNativeFromVM ttnfv(thread); // can't be in VM when we call JNI
743 const char* ccstrValue = (value == NULL) ? NULL : env->GetStringUTFChars(value, NULL);
744 ccstr ccstrResult = ccstrValue;
745 bool needFree;
746 {
747 ThreadInVMfromNative ttvfn(thread); // back to VM
748 needFree = SetVMFlag <ccstr> (thread, env, name, &ccstrResult, &CommandLineFlags::ccstrAtPut);
749 }
750 if (value != NULL) {
751 env->ReleaseStringUTFChars(value, ccstrValue);
752 }
753 if (needFree) {
754 FREE_C_HEAP_ARRAY(char, ccstrResult, mtInternal);
755 }
756 WB_END
757
758
759 WB_ENTRY(void, WB_LockCompilation(JNIEnv* env, jobject o, jlong timeout))
760 WhiteBox::compilation_locked = true;
761 WB_END
762
763 WB_ENTRY(void, WB_UnlockCompilation(JNIEnv* env, jobject o))
764 MonitorLockerEx mo(Compilation_lock, Mutex::_no_safepoint_check_flag);
765 WhiteBox::compilation_locked = false;
766 mo.notify_all();
767 WB_END
768
769 void WhiteBox::force_sweep() {
770 guarantee(WhiteBoxAPI, "internal testing API :: WhiteBox has to enabled");
771 {
772 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
773 NMethodSweeper::_should_sweep = true;
774 }
775 NMethodSweeper::possibly_sweep();
776 }
777
778 WB_ENTRY(void, WB_ForceNMethodSweep(JNIEnv* env, jobject o))
779 WhiteBox::force_sweep();
780 WB_END
781
782 WB_ENTRY(jboolean, WB_IsInStringTable(JNIEnv* env, jobject o, jstring javaString))
783 ResourceMark rm(THREAD);
784 int len;
785 jchar* name = java_lang_String::as_unicode_string(JNIHandles::resolve(javaString), len, CHECK_false);
786 return (StringTable::lookup(name, len) != NULL);
787 WB_END
788
789 WB_ENTRY(void, WB_FullGC(JNIEnv* env, jobject o))
790 Universe::heap()->collector_policy()->set_should_clear_all_soft_refs(true);
791 Universe::heap()->collect(GCCause::_last_ditch_collection);
792 #if INCLUDE_ALL_GCS
793 if (UseG1GC) {
794 // Needs to be cleared explicitly for G1
795 Universe::heap()->collector_policy()->set_should_clear_all_soft_refs(false);
796 }
797 #endif // INCLUDE_ALL_GCS
798 WB_END
799
800 WB_ENTRY(void, WB_YoungGC(JNIEnv* env, jobject o))
801 Universe::heap()->collect(GCCause::_wb_young_gc);
802 WB_END
803
804 WB_ENTRY(void, WB_ReadReservedMemory(JNIEnv* env, jobject o))
805 // static+volatile in order to force the read to happen
806 // (not be eliminated by the compiler)
807 static char c;
808 static volatile char* p;
809
810 p = os::reserve_memory(os::vm_allocation_granularity(), NULL, 0);
811 if (p == NULL) {
812 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), "Failed to reserve memory");
813 }
814
815 c = *p;
816 WB_END
817
818 WB_ENTRY(jstring, WB_GetCPUFeatures(JNIEnv* env, jobject o))
819 const char* cpu_features = VM_Version::cpu_features();
820 ThreadToNativeFromVM ttn(thread);
821 jstring features_string = env->NewStringUTF(cpu_features);
822
823 CHECK_JNI_EXCEPTION_(env, NULL);
824
825 return features_string;
826 WB_END
827
828 int WhiteBox::get_blob_type(const CodeBlob* code) {
829 guarantee(WhiteBoxAPI, "internal testing API :: WhiteBox has to enabled");
830 return CodeCache::get_code_heap(code)->code_blob_type();
831 }
832
833 CodeHeap* WhiteBox::get_code_heap(int blob_type) {
834 guarantee(WhiteBoxAPI, "internal testing API :: WhiteBox has to enabled");
835 return CodeCache::get_code_heap(blob_type);
836 }
837
838 struct CodeBlobStub {
839 CodeBlobStub(const CodeBlob* blob) :
840 name(os::strdup(blob->name())),
841 size(blob->size()),
842 blob_type(WhiteBox::get_blob_type(blob)) { }
843 ~CodeBlobStub() { os::free((void*) name); }
844 const char* const name;
845 const int size;
846 const int blob_type;
847 };
848
849 static jobjectArray codeBlob2objectArray(JavaThread* thread, JNIEnv* env, CodeBlobStub* cb) {
850 jclass clazz = env->FindClass(vmSymbols::java_lang_Object()->as_C_string());
851 CHECK_JNI_EXCEPTION_(env, NULL);
852 jobjectArray result = env->NewObjectArray(3, clazz, NULL);
853
854 jstring name = env->NewStringUTF(cb->name);
855 CHECK_JNI_EXCEPTION_(env, NULL);
856 env->SetObjectArrayElement(result, 0, name);
857
858 jobject obj = integerBox(thread, env, cb->size);
859 CHECK_JNI_EXCEPTION_(env, NULL);
860 env->SetObjectArrayElement(result, 1, obj);
861
862 obj = integerBox(thread, env, cb->blob_type);
863 CHECK_JNI_EXCEPTION_(env, NULL);
864 env->SetObjectArrayElement(result, 2, obj);
865
866 return result;
867 }
868
869 WB_ENTRY(jobjectArray, WB_GetNMethod(JNIEnv* env, jobject o, jobject method, jboolean is_osr))
870 ResourceMark rm(THREAD);
871 jmethodID jmid = reflected_method_to_jmid(thread, env, method);
872 CHECK_JNI_EXCEPTION_(env, NULL);
873 methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
874 nmethod* code = is_osr ? mh->lookup_osr_nmethod_for(InvocationEntryBci, CompLevel_none, false) : mh->code();
875 jobjectArray result = NULL;
876 if (code == NULL) {
877 return result;
878 }
879 int insts_size = code->insts_size();
880
881 ThreadToNativeFromVM ttn(thread);
882 jclass clazz = env->FindClass(vmSymbols::java_lang_Object()->as_C_string());
883 CHECK_JNI_EXCEPTION_(env, NULL);
884 result = env->NewObjectArray(4, clazz, NULL);
885 if (result == NULL) {
886 return result;
887 }
888
889 CodeBlobStub stub(code);
890 jobjectArray codeBlob = codeBlob2objectArray(thread, env, &stub);
891 env->SetObjectArrayElement(result, 0, codeBlob);
892
893 jobject level = integerBox(thread, env, code->comp_level());
894 CHECK_JNI_EXCEPTION_(env, NULL);
895 env->SetObjectArrayElement(result, 1, level);
896
897 jbyteArray insts = env->NewByteArray(insts_size);
898 CHECK_JNI_EXCEPTION_(env, NULL);
899 env->SetByteArrayRegion(insts, 0, insts_size, (jbyte*) code->insts_begin());
900 env->SetObjectArrayElement(result, 2, insts);
901
902 jobject id = integerBox(thread, env, code->compile_id());
903 CHECK_JNI_EXCEPTION_(env, NULL);
904 env->SetObjectArrayElement(result, 3, id);
905
906 return result;
907 WB_END
908
909 CodeBlob* WhiteBox::allocate_code_blob(int size, int blob_type) {
910 guarantee(WhiteBoxAPI, "internal testing API :: WhiteBox has to enabled");
911 BufferBlob* blob;
912 int full_size = CodeBlob::align_code_offset(sizeof(BufferBlob));
913 if (full_size < size) {
914 full_size += round_to(size - full_size, oopSize);
915 }
916 {
917 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
918 blob = (BufferBlob*) CodeCache::allocate(full_size, blob_type);
919 }
920 // Track memory usage statistic after releasing CodeCache_lock
921 MemoryService::track_code_cache_memory_usage();
922 ::new (blob) BufferBlob("WB::DummyBlob", full_size);
923 return blob;
924 }
925
926 WB_ENTRY(jlong, WB_AllocateCodeBlob(JNIEnv* env, jobject o, jint size, jint blob_type))
927 return (jlong) WhiteBox::allocate_code_blob(size, blob_type);
928 WB_END
929
930 WB_ENTRY(void, WB_FreeCodeBlob(JNIEnv* env, jobject o, jlong addr))
931 BufferBlob::free((BufferBlob*) addr);
932 WB_END
933
934 WB_ENTRY(jobjectArray, WB_GetCodeHeapEntries(JNIEnv* env, jobject o, jint blob_type))
935 ResourceMark rm;
936 GrowableArray<CodeBlobStub*> blobs;
937 {
938 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
939 CodeHeap* heap = WhiteBox::get_code_heap(blob_type);
940 if (heap == NULL) {
941 return NULL;
942 }
943 for (CodeBlob* cb = (CodeBlob*) heap->first();
944 cb != NULL; cb = (CodeBlob*) heap->next(cb)) {
945 CodeBlobStub* stub = NEW_RESOURCE_OBJ(CodeBlobStub);
946 new (stub) CodeBlobStub(cb);
947 blobs.append(stub);
948 }
949 }
950 if (blobs.length() == 0) {
951 return NULL;
952 }
953 ThreadToNativeFromVM ttn(thread);
954 jobjectArray result = NULL;
955 jclass clazz = env->FindClass(vmSymbols::java_lang_Object()->as_C_string());
956 CHECK_JNI_EXCEPTION_(env, NULL);
957 result = env->NewObjectArray(blobs.length(), clazz, NULL);
958 if (result == NULL) {
959 return result;
960 }
961 int i = 0;
962 for (GrowableArrayIterator<CodeBlobStub*> it = blobs.begin();
963 it != blobs.end(); ++it) {
964 jobjectArray obj = codeBlob2objectArray(thread, env, *it);
965 env->SetObjectArrayElement(result, i, obj);
966 ++i;
967 }
968 return result;
969 WB_END
970
971 WB_ENTRY(jlong, WB_GetThreadStackSize(JNIEnv* env, jobject o))
972 return (jlong) Thread::current()->stack_size();
973 WB_END
974
975 WB_ENTRY(jlong, WB_GetThreadRemainingStackSize(JNIEnv* env, jobject o))
976 JavaThread* t = JavaThread::current();
977 return (jlong) t->stack_available(os::current_stack_pointer()) - (jlong) StackShadowPages * os::vm_page_size();
978 WB_END
979
980 int WhiteBox::array_bytes_to_length(size_t bytes) {
981 return Array<u1>::bytes_to_length(bytes);
982 }
983
984 WB_ENTRY(jlong, WB_AllocateMetaspace(JNIEnv* env, jobject wb, jobject class_loader, jlong size))
985 if (size < 0) {
986 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
987 err_msg("WB_AllocateMetaspace: size is negative: " JLONG_FORMAT, size));
988 }
989
990 oop class_loader_oop = JNIHandles::resolve(class_loader);
991 ClassLoaderData* cld = class_loader_oop != NULL
992 ? java_lang_ClassLoader::loader_data(class_loader_oop)
993 : ClassLoaderData::the_null_class_loader_data();
994
995 void* metadata = MetadataFactory::new_writeable_array<u1>(cld, WhiteBox::array_bytes_to_length((size_t)size), thread);
996
997 return (jlong)(uintptr_t)metadata;
998 WB_END
999
1000 WB_ENTRY(void, WB_FreeMetaspace(JNIEnv* env, jobject wb, jobject class_loader, jlong addr, jlong size))
1001 oop class_loader_oop = JNIHandles::resolve(class_loader);
1002 ClassLoaderData* cld = class_loader_oop != NULL
1003 ? java_lang_ClassLoader::loader_data(class_loader_oop)
1004 : ClassLoaderData::the_null_class_loader_data();
1005
1006 MetadataFactory::free_array(cld, (Array<u1>*)(uintptr_t)addr);
1007 WB_END
1008
1009 WB_ENTRY(jlong, WB_IncMetaspaceCapacityUntilGC(JNIEnv* env, jobject wb, jlong inc))
1010 if (inc < 0) {
1011 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1012 err_msg("WB_IncMetaspaceCapacityUntilGC: inc is negative: " JLONG_FORMAT, inc));
1013 }
1014
1015 jlong max_size_t = (jlong) ((size_t) -1);
1016 if (inc > max_size_t) {
1017 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1018 err_msg("WB_IncMetaspaceCapacityUntilGC: inc does not fit in size_t: " JLONG_FORMAT, inc));
1019 }
1020
1021 size_t new_cap_until_GC = 0;
1022 size_t aligned_inc = align_size_down((size_t) inc, Metaspace::commit_alignment());
1023 bool success = MetaspaceGC::inc_capacity_until_GC(aligned_inc, &new_cap_until_GC);
1024 if (!success) {
1025 THROW_MSG_0(vmSymbols::java_lang_IllegalStateException(),
1026 "WB_IncMetaspaceCapacityUntilGC: could not increase capacity until GC "
1027 "due to contention with another thread");
1028 }
1029 return (jlong) new_cap_until_GC;
1030 WB_END
1031
1032 WB_ENTRY(jlong, WB_MetaspaceCapacityUntilGC(JNIEnv* env, jobject wb))
1033 return (jlong) MetaspaceGC::capacity_until_GC();
1034 WB_END
1035
1036 //Some convenience methods to deal with objects from java
1037 int WhiteBox::offset_for_field(const char* field_name, oop object,
1038 Symbol* signature_symbol) {
1039 assert(field_name != NULL && strlen(field_name) > 0, "Field name not valid");
1040 Thread* THREAD = Thread::current();
1041
1042 //Get the class of our object
1043 Klass* arg_klass = object->klass();
1044 //Turn it into an instance-klass
1045 InstanceKlass* ik = InstanceKlass::cast(arg_klass);
1046
1047 //Create symbols to look for in the class
1048 TempNewSymbol name_symbol = SymbolTable::lookup(field_name, (int) strlen(field_name),
1049 THREAD);
1050
1051 //To be filled in with an offset of the field we're looking for
1052 fieldDescriptor fd;
1053
1054 Klass* res = ik->find_field(name_symbol, signature_symbol, &fd);
1055 if (res == NULL) {
1056 tty->print_cr("Invalid layout of %s at %s", ik->external_name(),
1057 name_symbol->as_C_string());
1058 fatal("Invalid layout of preloaded class");
1059 }
1060
1061 //fetch the field at the offset we've found
1062 int dest_offset = fd.offset();
1063
1064 return dest_offset;
1065 }
1066
1067
1068 const char* WhiteBox::lookup_jstring(const char* field_name, oop object) {
1069 int offset = offset_for_field(field_name, object,
1070 vmSymbols::string_signature());
1071 oop string = object->obj_field(offset);
1072 if (string == NULL) {
1073 return NULL;
1074 }
1075 const char* ret = java_lang_String::as_utf8_string(string);
1076 return ret;
1077 }
1078
1079 bool WhiteBox::lookup_bool(const char* field_name, oop object) {
1080 int offset =
1081 offset_for_field(field_name, object, vmSymbols::bool_signature());
1082 bool ret = (object->bool_field(offset) == JNI_TRUE);
1083 return ret;
1084 }
1085
1086 void WhiteBox::register_methods(JNIEnv* env, jclass wbclass, JavaThread* thread, JNINativeMethod* method_array, int method_count) {
1087 ResourceMark rm;
1088 ThreadToNativeFromVM ttnfv(thread); // can't be in VM when we call JNI
1089
1090 // one by one registration natives for exception catching
1091 jclass no_such_method_error_klass = env->FindClass(vmSymbols::java_lang_NoSuchMethodError()->as_C_string());
1092 CHECK_JNI_EXCEPTION(env);
1093 for (int i = 0, n = method_count; i < n; ++i) {
1094 // Skip dummy entries
1095 if (method_array[i].fnPtr == NULL) continue;
1096 if (env->RegisterNatives(wbclass, &method_array[i], 1) != 0) {
1097 jthrowable throwable_obj = env->ExceptionOccurred();
1098 if (throwable_obj != NULL) {
1099 env->ExceptionClear();
1100 if (env->IsInstanceOf(throwable_obj, no_such_method_error_klass)) {
1101 // NoSuchMethodError is thrown when a method can't be found or a method is not native.
1102 // Ignoring the exception since it is not preventing use of other WhiteBox methods.
1103 tty->print_cr("Warning: 'NoSuchMethodError' on register of sun.hotspot.WhiteBox::%s%s",
1104 method_array[i].name, method_array[i].signature);
1105 }
1106 } else {
1107 // Registration failed unexpectedly.
1108 tty->print_cr("Warning: unexpected error on register of sun.hotspot.WhiteBox::%s%s. All methods will be unregistered",
1109 method_array[i].name, method_array[i].signature);
1110 env->UnregisterNatives(wbclass);
1111 break;
1112 }
1113 }
1114 }
1115 }
1116
1117 #define CC (char*)
1118
1119 static JNINativeMethod methods[] = {
1120 {CC"getObjectAddress", CC"(Ljava/lang/Object;)J", (void*)&WB_GetObjectAddress },
1121 {CC"getObjectSize", CC"(Ljava/lang/Object;)J", (void*)&WB_GetObjectSize },
1122 {CC"isObjectInOldGen", CC"(Ljava/lang/Object;)Z", (void*)&WB_isObjectInOldGen },
1123 {CC"getHeapOopSize", CC"()I", (void*)&WB_GetHeapOopSize },
1124 {CC"isClassAlive0", CC"(Ljava/lang/String;)Z", (void*)&WB_IsClassAlive },
1125 {CC"parseCommandLine",
1126 CC"(Ljava/lang/String;[Lsun/hotspot/parser/DiagnosticCommand;)[Ljava/lang/Object;",
1127 (void*) &WB_ParseCommandLine
1128 },
1129 {CC"addToBootstrapClassLoaderSearch", CC"(Ljava/lang/String;)V",
1130 (void*)&WB_AddToBootstrapClassLoaderSearch},
1131 {CC"addToSystemClassLoaderSearch", CC"(Ljava/lang/String;)V",
1132 (void*)&WB_AddToSystemClassLoaderSearch},
1133 {CC"getCompressedOopsMaxHeapSize", CC"()J",
1134 (void*)&WB_GetCompressedOopsMaxHeapSize},
1135 {CC"printHeapSizes", CC"()V", (void*)&WB_PrintHeapSizes },
1136 {CC"runMemoryUnitTests", CC"()V", (void*)&WB_RunMemoryUnitTests},
1137 {CC"readFromNoaccessArea",CC"()V", (void*)&WB_ReadFromNoaccessArea},
1138 {CC"stressVirtualSpaceResize",CC"(JJJ)I", (void*)&WB_StressVirtualSpaceResize},
1139 #if INCLUDE_ALL_GCS
1140 {CC"g1InConcurrentMark", CC"()Z", (void*)&WB_G1InConcurrentMark},
1141 {CC"g1IsHumongous", CC"(Ljava/lang/Object;)Z", (void*)&WB_G1IsHumongous },
1142 {CC"g1NumFreeRegions", CC"()J", (void*)&WB_G1NumFreeRegions },
1143 {CC"g1RegionSize", CC"()I", (void*)&WB_G1RegionSize },
1144 #endif // INCLUDE_ALL_GCS
1145 #if INCLUDE_NMT
1146 {CC"NMTMalloc", CC"(J)J", (void*)&WB_NMTMalloc },
1147 {CC"NMTMallocWithPseudoStack", CC"(JI)J", (void*)&WB_NMTMallocWithPseudoStack},
1148 {CC"NMTFree", CC"(J)V", (void*)&WB_NMTFree },
1149 {CC"NMTReserveMemory", CC"(J)J", (void*)&WB_NMTReserveMemory },
1150 {CC"NMTCommitMemory", CC"(JJ)V", (void*)&WB_NMTCommitMemory },
1151 {CC"NMTUncommitMemory", CC"(JJ)V", (void*)&WB_NMTUncommitMemory },
1152 {CC"NMTReleaseMemory", CC"(JJ)V", (void*)&WB_NMTReleaseMemory },
1153 {CC"NMTIsDetailSupported",CC"()Z", (void*)&WB_NMTIsDetailSupported},
1154 {CC"NMTChangeTrackingLevel", CC"()Z", (void*)&WB_NMTChangeTrackingLevel},
1155 {CC"NMTGetHashSize", CC"()I", (void*)&WB_NMTGetHashSize },
1156 #endif // INCLUDE_NMT
1157 {CC"deoptimizeAll", CC"()V", (void*)&WB_DeoptimizeAll },
1158 {CC"deoptimizeMethod", CC"(Ljava/lang/reflect/Executable;Z)I",
1159 (void*)&WB_DeoptimizeMethod },
1160 {CC"isMethodCompiled", CC"(Ljava/lang/reflect/Executable;Z)Z",
1161 (void*)&WB_IsMethodCompiled },
1162 {CC"isMethodCompilable", CC"(Ljava/lang/reflect/Executable;IZ)Z",
1163 (void*)&WB_IsMethodCompilable},
1164 {CC"isMethodQueuedForCompilation",
1165 CC"(Ljava/lang/reflect/Executable;)Z", (void*)&WB_IsMethodQueuedForCompilation},
1166 {CC"makeMethodNotCompilable",
1167 CC"(Ljava/lang/reflect/Executable;IZ)V", (void*)&WB_MakeMethodNotCompilable},
1168 {CC"testSetDontInlineMethod",
1169 CC"(Ljava/lang/reflect/Executable;Z)Z", (void*)&WB_TestSetDontInlineMethod},
1170 {CC"getMethodCompilationLevel",
1171 CC"(Ljava/lang/reflect/Executable;Z)I", (void*)&WB_GetMethodCompilationLevel},
1172 {CC"getMethodEntryBci",
1173 CC"(Ljava/lang/reflect/Executable;)I", (void*)&WB_GetMethodEntryBci},
1174 {CC"getCompileQueueSize",
1175 CC"(I)I", (void*)&WB_GetCompileQueueSize},
1176 {CC"testSetForceInlineMethod",
1177 CC"(Ljava/lang/reflect/Executable;Z)Z", (void*)&WB_TestSetForceInlineMethod},
1178 {CC"enqueueMethodForCompilation",
1179 CC"(Ljava/lang/reflect/Executable;II)Z", (void*)&WB_EnqueueMethodForCompilation},
1180 {CC"clearMethodState",
1181 CC"(Ljava/lang/reflect/Executable;)V", (void*)&WB_ClearMethodState},
1182 {CC"lockCompilation", CC"()V", (void*)&WB_LockCompilation},
1183 {CC"unlockCompilation", CC"()V", (void*)&WB_UnlockCompilation},
1184 {CC"isConstantVMFlag", CC"(Ljava/lang/String;)Z", (void*)&WB_IsConstantVMFlag},
1185 {CC"isLockedVMFlag", CC"(Ljava/lang/String;)Z", (void*)&WB_IsLockedVMFlag},
1186 {CC"setBooleanVMFlag", CC"(Ljava/lang/String;Z)V",(void*)&WB_SetBooleanVMFlag},
1187 {CC"setIntxVMFlag", CC"(Ljava/lang/String;J)V",(void*)&WB_SetIntxVMFlag},
1188 {CC"setUintxVMFlag", CC"(Ljava/lang/String;J)V",(void*)&WB_SetUintxVMFlag},
1189 {CC"setUint64VMFlag", CC"(Ljava/lang/String;J)V",(void*)&WB_SetUint64VMFlag},
1190 {CC"setSizeTVMFlag", CC"(Ljava/lang/String;J)V",(void*)&WB_SetSizeTVMFlag},
1191 {CC"setDoubleVMFlag", CC"(Ljava/lang/String;D)V",(void*)&WB_SetDoubleVMFlag},
1192 {CC"setStringVMFlag", CC"(Ljava/lang/String;Ljava/lang/String;)V",
1193 (void*)&WB_SetStringVMFlag},
1194 {CC"getBooleanVMFlag", CC"(Ljava/lang/String;)Ljava/lang/Boolean;",
1195 (void*)&WB_GetBooleanVMFlag},
1196 {CC"getIntxVMFlag", CC"(Ljava/lang/String;)Ljava/lang/Long;",
1197 (void*)&WB_GetIntxVMFlag},
1198 {CC"getUintxVMFlag", CC"(Ljava/lang/String;)Ljava/lang/Long;",
1199 (void*)&WB_GetUintxVMFlag},
1200 {CC"getUint64VMFlag", CC"(Ljava/lang/String;)Ljava/lang/Long;",
1201 (void*)&WB_GetUint64VMFlag},
1202 {CC"getSizeTVMFlag", CC"(Ljava/lang/String;)Ljava/lang/Long;",
1203 (void*)&WB_GetSizeTVMFlag},
1204 {CC"getDoubleVMFlag", CC"(Ljava/lang/String;)Ljava/lang/Double;",
1205 (void*)&WB_GetDoubleVMFlag},
1206 {CC"getStringVMFlag", CC"(Ljava/lang/String;)Ljava/lang/String;",
1207 (void*)&WB_GetStringVMFlag},
1208 {CC"isInStringTable", CC"(Ljava/lang/String;)Z", (void*)&WB_IsInStringTable },
1209 {CC"fullGC", CC"()V", (void*)&WB_FullGC },
1210 {CC"youngGC", CC"()V", (void*)&WB_YoungGC },
1211 {CC"readReservedMemory", CC"()V", (void*)&WB_ReadReservedMemory },
1212 {CC"allocateMetaspace",
1213 CC"(Ljava/lang/ClassLoader;J)J", (void*)&WB_AllocateMetaspace },
1214 {CC"freeMetaspace",
1215 CC"(Ljava/lang/ClassLoader;JJ)V", (void*)&WB_FreeMetaspace },
1216 {CC"incMetaspaceCapacityUntilGC", CC"(J)J", (void*)&WB_IncMetaspaceCapacityUntilGC },
1217 {CC"metaspaceCapacityUntilGC", CC"()J", (void*)&WB_MetaspaceCapacityUntilGC },
1218 {CC"getCPUFeatures", CC"()Ljava/lang/String;", (void*)&WB_GetCPUFeatures },
1219 {CC"getNMethod", CC"(Ljava/lang/reflect/Executable;Z)[Ljava/lang/Object;",
1220 (void*)&WB_GetNMethod },
1221 {CC"forceNMethodSweep", CC"()V", (void*)&WB_ForceNMethodSweep },
1222 {CC"allocateCodeBlob", CC"(II)J", (void*)&WB_AllocateCodeBlob },
1223 {CC"freeCodeBlob", CC"(J)V", (void*)&WB_FreeCodeBlob },
1224 {CC"getCodeHeapEntries", CC"(I)[Ljava/lang/Object;",(void*)&WB_GetCodeHeapEntries },
1225 {CC"getThreadStackSize", CC"()J", (void*)&WB_GetThreadStackSize },
1226 {CC"getThreadRemainingStackSize", CC"()J", (void*)&WB_GetThreadRemainingStackSize },
1227 };
1228
1229 #undef CC
1230
1231 JVM_ENTRY(void, JVM_RegisterWhiteBoxMethods(JNIEnv* env, jclass wbclass))
1232 {
1233 if (WhiteBoxAPI) {
1234 // Make sure that wbclass is loaded by the null classloader
1235 instanceKlassHandle ikh = instanceKlassHandle(JNIHandles::resolve(wbclass)->klass());
1236 Handle loader(ikh->class_loader());
1237 if (loader.is_null()) {
1238 WhiteBox::register_methods(env, wbclass, thread, methods, sizeof(methods) / sizeof(methods[0]));
1239 WhiteBox::register_extended(env, wbclass, thread);
1240 WhiteBox::set_used();
1241 }
1242 }
1243 }
1244 JVM_END