1 /*
   2  * Copyright (c) 2012, 2015, 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 "classfile/classLoaderData.hpp"
  30 #include "classfile/stringTable.hpp"
  31 #include "code/codeCache.hpp"
  32 #include "jvmtifiles/jvmtiEnv.hpp"
  33 #include "memory/metadataFactory.hpp"
  34 #include "memory/universe.hpp"
  35 #include "oops/oop.inline.hpp"
  36 #include "prims/wbtestmethods/parserTests.hpp"
  37 #include "prims/whitebox.hpp"
  38 #include "runtime/arguments.hpp"
  39 #include "runtime/compilationPolicy.hpp"
  40 #include "runtime/deoptimization.hpp"
  41 #include "runtime/interfaceSupport.hpp"
  42 #include "runtime/os.hpp"
  43 #include "runtime/sweeper.hpp"
  44 #include "runtime/javaCalls.hpp"
  45 #include "runtime/thread.hpp"
  46 #include "runtime/vm_version.hpp"
  47 #include "utilities/array.hpp"
  48 #include "utilities/debug.hpp"
  49 #include "utilities/exceptions.hpp"
  50 #include "utilities/macros.hpp"
  51 #if INCLUDE_ALL_GCS
  52 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.inline.hpp"
  53 #include "gc_implementation/g1/concurrentMark.hpp"
  54 #include "gc_implementation/g1/concurrentMarkThread.hpp"
  55 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
  56 #include "gc_implementation/g1/heapRegionRemSet.hpp"
  57 #endif // INCLUDE_ALL_GCS
  58 #if INCLUDE_NMT
  59 #include "services/mallocSiteTable.hpp"
  60 #include "services/memTracker.hpp"
  61 #include "utilities/nativeCallStack.hpp"
  62 #endif // INCLUDE_NMT
  63 
  64 
  65 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
  66 
  67 #define SIZE_T_MAX_VALUE ((size_t) -1)
  68 
  69 bool WhiteBox::_used = false;
  70 volatile bool WhiteBox::compilation_locked = false;
  71 
  72 class VM_WhiteBoxOperation : public VM_Operation {
  73  public:
  74   VM_WhiteBoxOperation()                         { }
  75   VMOp_Type type()                  const        { return VMOp_WhiteBoxOperation; }
  76   bool allow_nested_vm_operations() const        { return true; }
  77 };
  78 
  79 
  80 WB_ENTRY(jlong, WB_GetObjectAddress(JNIEnv* env, jobject o, jobject obj))
  81   return (jlong)(void*)JNIHandles::resolve(obj);
  82 WB_END
  83 
  84 WB_ENTRY(jint, WB_GetHeapOopSize(JNIEnv* env, jobject o))
  85   return heapOopSize;
  86 WB_END
  87 
  88 WB_ENTRY(jint, WB_GetVMPageSize(JNIEnv* env, jobject o))
  89   return os::vm_page_size();
  90 WB_END
  91 
  92 WB_ENTRY(jlong, WB_GetVMLargePageSize(JNIEnv* env, jobject o))
  93   return os::large_page_size();
  94 WB_END
  95 
  96 class WBIsKlassAliveClosure : public KlassClosure {
  97     Symbol* _name;
  98     bool _found;
  99 public:
 100     WBIsKlassAliveClosure(Symbol* name) : _name(name), _found(false) {}
 101 
 102     void do_klass(Klass* k) {
 103       if (_found) return;
 104       Symbol* ksym = k->name();
 105       if (ksym->fast_compare(_name) == 0) {
 106         _found = true;
 107       }
 108     }
 109 
 110     bool found() const {
 111         return _found;
 112     }
 113 };
 114 
 115 WB_ENTRY(jboolean, WB_IsClassAlive(JNIEnv* env, jobject target, jstring name))
 116   Handle h_name = JNIHandles::resolve(name);
 117   if (h_name.is_null()) return false;
 118   Symbol* sym = java_lang_String::as_symbol(h_name, CHECK_false);
 119   TempNewSymbol tsym(sym); // Make sure to decrement reference count on sym on return
 120 
 121   WBIsKlassAliveClosure closure(sym);
 122   ClassLoaderDataGraph::classes_do(&closure);
 123 
 124   return closure.found();
 125 WB_END
 126 
 127 WB_ENTRY(void, WB_AddToBootstrapClassLoaderSearch(JNIEnv* env, jobject o, jstring segment)) {
 128 #if INCLUDE_JVMTI
 129   ResourceMark rm;
 130   const char* seg = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(segment));
 131   JvmtiEnv* jvmti_env = JvmtiEnv::create_a_jvmti(JVMTI_VERSION);
 132   jvmtiError err = jvmti_env->AddToBootstrapClassLoaderSearch(seg);
 133   assert(err == JVMTI_ERROR_NONE, "must not fail");
 134 #endif
 135 }
 136 WB_END
 137 
 138 WB_ENTRY(void, WB_AddToSystemClassLoaderSearch(JNIEnv* env, jobject o, jstring segment)) {
 139 #if INCLUDE_JVMTI
 140   ResourceMark rm;
 141   const char* seg = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(segment));
 142   JvmtiEnv* jvmti_env = JvmtiEnv::create_a_jvmti(JVMTI_VERSION);
 143   jvmtiError err = jvmti_env->AddToSystemClassLoaderSearch(seg);
 144   assert(err == JVMTI_ERROR_NONE, "must not fail");
 145 #endif
 146 }
 147 WB_END
 148 
 149 
 150 WB_ENTRY(jlong, WB_GetCompressedOopsMaxHeapSize(JNIEnv* env, jobject o)) {
 151   return (jlong)Arguments::max_heap_for_compressed_oops();
 152 }
 153 WB_END
 154 
 155 WB_ENTRY(void, WB_PrintHeapSizes(JNIEnv* env, jobject o)) {
 156   CollectorPolicy * p = Universe::heap()->collector_policy();
 157   gclog_or_tty->print_cr("Minimum heap "SIZE_FORMAT" Initial heap "
 158     SIZE_FORMAT" Maximum heap "SIZE_FORMAT" Space alignment "SIZE_FORMAT" Heap alignment "SIZE_FORMAT,
 159     p->min_heap_byte_size(), p->initial_heap_byte_size(), p->max_heap_byte_size(),
 160     p->space_alignment(), p->heap_alignment());
 161 }
 162 WB_END
 163 
 164 #ifndef PRODUCT
 165 // Forward declaration
 166 void TestReservedSpace_test();
 167 void TestReserveMemorySpecial_test();
 168 void TestVirtualSpace_test();
 169 void TestMetaspaceAux_test();
 170 #endif
 171 
 172 WB_ENTRY(void, WB_RunMemoryUnitTests(JNIEnv* env, jobject o))
 173 #ifndef PRODUCT
 174   TestReservedSpace_test();
 175   TestReserveMemorySpecial_test();
 176   TestVirtualSpace_test();
 177   TestMetaspaceAux_test();
 178 #endif
 179 WB_END
 180 
 181 WB_ENTRY(void, WB_ReadFromNoaccessArea(JNIEnv* env, jobject o))
 182   size_t granularity = os::vm_allocation_granularity();
 183   ReservedHeapSpace rhs(100 * granularity, granularity, false);
 184   VirtualSpace vs;
 185   vs.initialize(rhs, 50 * granularity);
 186 
 187   // Check if constraints are complied
 188   if (!( UseCompressedOops && rhs.base() != NULL &&
 189          Universe::narrow_oop_base() != NULL &&
 190          Universe::narrow_oop_use_implicit_null_checks() )) {
 191     tty->print_cr("WB_ReadFromNoaccessArea method is useless:\n "
 192                   "\tUseCompressedOops is %d\n"
 193                   "\trhs.base() is "PTR_FORMAT"\n"
 194                   "\tUniverse::narrow_oop_base() is "PTR_FORMAT"\n"
 195                   "\tUniverse::narrow_oop_use_implicit_null_checks() is %d",
 196                   UseCompressedOops,
 197                   rhs.base(),
 198                   Universe::narrow_oop_base(),
 199                   Universe::narrow_oop_use_implicit_null_checks());
 200     return;
 201   }
 202   tty->print_cr("Reading from no access area... ");
 203   tty->print_cr("*(vs.low_boundary() - rhs.noaccess_prefix() / 2 ) = %c",
 204                 *(vs.low_boundary() - rhs.noaccess_prefix() / 2 ));
 205 WB_END
 206 
 207 static jint wb_stress_virtual_space_resize(size_t reserved_space_size,
 208                                            size_t magnitude, size_t iterations) {
 209   size_t granularity = os::vm_allocation_granularity();
 210   ReservedHeapSpace rhs(reserved_space_size * granularity, granularity, false);
 211   VirtualSpace vs;
 212   if (!vs.initialize(rhs, 0)) {
 213     tty->print_cr("Failed to initialize VirtualSpace. Can't proceed.");
 214     return 3;
 215   }
 216 
 217   long seed = os::random();
 218   tty->print_cr("Random seed is %ld", seed);
 219   os::init_random(seed);
 220 
 221   for (size_t i = 0; i < iterations; i++) {
 222 
 223     // Whether we will shrink or grow
 224     bool shrink = os::random() % 2L == 0;
 225 
 226     // Get random delta to resize virtual space
 227     size_t delta = (size_t)os::random() % magnitude;
 228 
 229     // If we are about to shrink virtual space below zero, then expand instead
 230     if (shrink && vs.committed_size() < delta) {
 231       shrink = false;
 232     }
 233 
 234     // Resizing by delta
 235     if (shrink) {
 236       vs.shrink_by(delta);
 237     } else {
 238       // If expanding fails expand_by will silently return false
 239       vs.expand_by(delta, true);
 240     }
 241   }
 242   return 0;
 243 }
 244 
 245 WB_ENTRY(jint, WB_StressVirtualSpaceResize(JNIEnv* env, jobject o,
 246         jlong reserved_space_size, jlong magnitude, jlong iterations))
 247   tty->print_cr("reservedSpaceSize="JLONG_FORMAT", magnitude="JLONG_FORMAT", "
 248                 "iterations="JLONG_FORMAT"\n", reserved_space_size, magnitude,
 249                 iterations);
 250   if (reserved_space_size < 0 || magnitude < 0 || iterations < 0) {
 251     tty->print_cr("One of variables printed above is negative. Can't proceed.\n");
 252     return 1;
 253   }
 254 
 255   // sizeof(size_t) depends on whether OS is 32bit or 64bit. sizeof(jlong) is
 256   // always 8 byte. That's why we should avoid overflow in case of 32bit platform.
 257   if (sizeof(size_t) < sizeof(jlong)) {
 258     jlong size_t_max_value = (jlong) SIZE_T_MAX_VALUE;
 259     if (reserved_space_size > size_t_max_value || magnitude > size_t_max_value
 260         || iterations > size_t_max_value) {
 261       tty->print_cr("One of variables printed above overflows size_t. Can't proceed.\n");
 262       return 2;
 263     }
 264   }
 265 
 266   return wb_stress_virtual_space_resize((size_t) reserved_space_size,
 267                                         (size_t) magnitude, (size_t) iterations);
 268 WB_END
 269 
 270 WB_ENTRY(jboolean, WB_isObjectInOldGen(JNIEnv* env, jobject o, jobject obj))
 271   oop p = JNIHandles::resolve(obj);
 272 #if INCLUDE_ALL_GCS
 273   if (UseG1GC) {
 274     G1CollectedHeap* g1 = G1CollectedHeap::heap();
 275     const HeapRegion* hr = g1->heap_region_containing(p);
 276     if (hr == NULL) {
 277       return false;
 278     }
 279     return !(hr->is_young());
 280   } else if (UseParallelGC) {
 281     ParallelScavengeHeap* psh = ParallelScavengeHeap::heap();
 282     return !psh->is_in_young(p);
 283   }
 284 #endif // INCLUDE_ALL_GCS
 285   GenCollectedHeap* gch = GenCollectedHeap::heap();
 286   return !gch->is_in_young(p);
 287 WB_END
 288 
 289 WB_ENTRY(jlong, WB_GetObjectSize(JNIEnv* env, jobject o, jobject obj))
 290   oop p = JNIHandles::resolve(obj);
 291   return p->size() * HeapWordSize;
 292 WB_END
 293 
 294 #if INCLUDE_ALL_GCS
 295 WB_ENTRY(jboolean, WB_G1IsHumongous(JNIEnv* env, jobject o, jobject obj))
 296   G1CollectedHeap* g1 = G1CollectedHeap::heap();
 297   oop result = JNIHandles::resolve(obj);
 298   const HeapRegion* hr = g1->heap_region_containing(result);
 299   return hr->is_humongous();
 300 WB_END
 301 
 302 WB_ENTRY(jlong, WB_G1NumFreeRegions(JNIEnv* env, jobject o))
 303   G1CollectedHeap* g1 = G1CollectedHeap::heap();
 304   size_t nr = g1->num_free_regions();
 305   return (jlong)nr;
 306 WB_END
 307 
 308 WB_ENTRY(jboolean, WB_G1InConcurrentMark(JNIEnv* env, jobject o))
 309   G1CollectedHeap* g1 = G1CollectedHeap::heap();
 310   return g1->concurrent_mark()->cmThread()->during_cycle();
 311 WB_END
 312 
 313 WB_ENTRY(jboolean, WB_G1StartMarkCycle(JNIEnv* env, jobject o))
 314   G1CollectedHeap* g1h = G1CollectedHeap::heap();
 315   if (!g1h->concurrent_mark()->cmThread()->during_cycle()) {
 316     g1h->collect(GCCause::_wb_conc_mark);
 317     return true;
 318   }
 319   return false;
 320 WB_END
 321 
 322 WB_ENTRY(jint, WB_G1RegionSize(JNIEnv* env, jobject o))
 323   return (jint)HeapRegion::GrainBytes;
 324 WB_END
 325 #endif // INCLUDE_ALL_GCS
 326 
 327 #if INCLUDE_NMT
 328 // Alloc memory using the test memory type so that we can use that to see if
 329 // NMT picks it up correctly
 330 WB_ENTRY(jlong, WB_NMTMalloc(JNIEnv* env, jobject o, jlong size))
 331   jlong addr = 0;
 332   addr = (jlong)(uintptr_t)os::malloc(size, mtTest);
 333   return addr;
 334 WB_END
 335 
 336 // Alloc memory with pseudo call stack. The test can create psudo malloc
 337 // allocation site to stress the malloc tracking.
 338 WB_ENTRY(jlong, WB_NMTMallocWithPseudoStack(JNIEnv* env, jobject o, jlong size, jint pseudo_stack))
 339   address pc = (address)(size_t)pseudo_stack;
 340   NativeCallStack stack(&pc, 1);
 341   return (jlong)(uintptr_t)os::malloc(size, mtTest, stack);
 342 WB_END
 343 
 344 // Free the memory allocated by NMTAllocTest
 345 WB_ENTRY(void, WB_NMTFree(JNIEnv* env, jobject o, jlong mem))
 346   os::free((void*)(uintptr_t)mem);
 347 WB_END
 348 
 349 WB_ENTRY(jlong, WB_NMTReserveMemory(JNIEnv* env, jobject o, jlong size))
 350   jlong addr = 0;
 351 
 352   addr = (jlong)(uintptr_t)os::reserve_memory(size);
 353   MemTracker::record_virtual_memory_type((address)addr, mtTest);
 354 
 355   return addr;
 356 WB_END
 357 
 358 WB_ENTRY(void, WB_NMTCommitMemory(JNIEnv* env, jobject o, jlong addr, jlong size))
 359   os::commit_memory((char *)(uintptr_t)addr, size, !ExecMem);
 360   MemTracker::record_virtual_memory_type((address)(uintptr_t)addr, mtTest);
 361 WB_END
 362 
 363 WB_ENTRY(void, WB_NMTUncommitMemory(JNIEnv* env, jobject o, jlong addr, jlong size))
 364   os::uncommit_memory((char *)(uintptr_t)addr, size);
 365 WB_END
 366 
 367 WB_ENTRY(void, WB_NMTReleaseMemory(JNIEnv* env, jobject o, jlong addr, jlong size))
 368   os::release_memory((char *)(uintptr_t)addr, size);
 369 WB_END
 370 
 371 WB_ENTRY(jboolean, WB_NMTIsDetailSupported(JNIEnv* env))
 372   return MemTracker::tracking_level() == NMT_detail;
 373 WB_END
 374 
 375 WB_ENTRY(jboolean, WB_NMTChangeTrackingLevel(JNIEnv* env))
 376   // Test that we can downgrade NMT levels but not upgrade them.
 377   if (MemTracker::tracking_level() == NMT_off) {
 378     MemTracker::transition_to(NMT_off);
 379     return MemTracker::tracking_level() == NMT_off;
 380   } else {
 381     assert(MemTracker::tracking_level() == NMT_detail, "Should start out as detail tracking");
 382     MemTracker::transition_to(NMT_summary);
 383     assert(MemTracker::tracking_level() == NMT_summary, "Should be summary now");
 384 
 385     // Can't go to detail once NMT is set to summary.
 386     MemTracker::transition_to(NMT_detail);
 387     assert(MemTracker::tracking_level() == NMT_summary, "Should still be summary now");
 388 
 389     // Shutdown sets tracking level to minimal.
 390     MemTracker::shutdown();
 391     assert(MemTracker::tracking_level() == NMT_minimal, "Should be minimal now");
 392 
 393     // Once the tracking level is minimal, we cannot increase to summary.
 394     // The code ignores this request instead of asserting because if the malloc site
 395     // table overflows in another thread, it tries to change the code to summary.
 396     MemTracker::transition_to(NMT_summary);
 397     assert(MemTracker::tracking_level() == NMT_minimal, "Should still be minimal now");
 398 
 399     // Really can never go up to detail, verify that the code would never do this.
 400     MemTracker::transition_to(NMT_detail);
 401     assert(MemTracker::tracking_level() == NMT_minimal, "Should still be minimal now");
 402     return MemTracker::tracking_level() == NMT_minimal;
 403   }
 404 WB_END
 405 
 406 WB_ENTRY(jint, WB_NMTGetHashSize(JNIEnv* env, jobject o))
 407   int hash_size = MallocSiteTable::hash_buckets();
 408   assert(hash_size > 0, "NMT hash_size should be > 0");
 409   return (jint)hash_size;
 410 WB_END
 411 #endif // INCLUDE_NMT
 412 
 413 static jmethodID reflected_method_to_jmid(JavaThread* thread, JNIEnv* env, jobject method) {
 414   assert(method != NULL, "method should not be null");
 415   ThreadToNativeFromVM ttn(thread);
 416   return env->FromReflectedMethod(method);
 417 }
 418 
 419 // Deoptimizes all compiled frames and makes nmethods not entrant if it's requested
 420 class VM_WhiteBoxDeoptimizeFrames : public VM_WhiteBoxOperation {
 421  private:
 422   int _result;
 423   const bool _make_not_entrant;
 424  public:
 425   VM_WhiteBoxDeoptimizeFrames(bool make_not_entrant) :
 426         _result(0), _make_not_entrant(make_not_entrant) { }
 427   int  result() const { return _result; }
 428 
 429   void doit() {
 430     for (JavaThread* t = Threads::first(); t != NULL; t = t->next()) {
 431       if (t->has_last_Java_frame()) {
 432         for (StackFrameStream fst(t, UseBiasedLocking); !fst.is_done(); fst.next()) {
 433           frame* f = fst.current();
 434           if (f->can_be_deoptimized() && !f->is_deoptimized_frame()) {
 435             RegisterMap* reg_map = fst.register_map();
 436             Deoptimization::deoptimize(t, *f, reg_map);
 437             if (_make_not_entrant) {
 438                 nmethod* nm = CodeCache::find_nmethod(f->pc());
 439                 assert(nm != NULL, "sanity check");
 440                 nm->make_not_entrant();
 441             }
 442             ++_result;
 443           }
 444         }
 445       }
 446     }
 447   }
 448 };
 449 
 450 WB_ENTRY(jint, WB_DeoptimizeFrames(JNIEnv* env, jobject o, jboolean make_not_entrant))
 451   VM_WhiteBoxDeoptimizeFrames op(make_not_entrant == JNI_TRUE);
 452   VMThread::execute(&op);
 453   return op.result();
 454 WB_END
 455 
 456 WB_ENTRY(void, WB_DeoptimizeAll(JNIEnv* env, jobject o))
 457   MutexLockerEx mu(Compile_lock);
 458   CodeCache::mark_all_nmethods_for_deoptimization();
 459   VM_Deoptimize op;
 460   VMThread::execute(&op);
 461 WB_END
 462 
 463 WB_ENTRY(jint, WB_DeoptimizeMethod(JNIEnv* env, jobject o, jobject method, jboolean is_osr))
 464   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
 465   int result = 0;
 466   CHECK_JNI_EXCEPTION_(env, result);
 467   MutexLockerEx mu(Compile_lock);
 468   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
 469   if (is_osr) {
 470     result += mh->mark_osr_nmethods();
 471   } else if (mh->code() != NULL) {
 472     mh->code()->mark_for_deoptimization();
 473     ++result;
 474   }
 475   result += CodeCache::mark_for_deoptimization(mh());
 476   if (result > 0) {
 477     VM_Deoptimize op;
 478     VMThread::execute(&op);
 479   }
 480   return result;
 481 WB_END
 482 
 483 WB_ENTRY(jboolean, WB_IsMethodCompiled(JNIEnv* env, jobject o, jobject method, jboolean is_osr))
 484   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
 485   CHECK_JNI_EXCEPTION_(env, JNI_FALSE);
 486   MutexLockerEx mu(Compile_lock);
 487   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
 488   nmethod* code = is_osr ? mh->lookup_osr_nmethod_for(InvocationEntryBci, CompLevel_none, false) : mh->code();
 489   if (code == NULL) {
 490     return JNI_FALSE;
 491   }
 492   return (code->is_alive() && !code->is_marked_for_deoptimization());
 493 WB_END
 494 
 495 WB_ENTRY(jboolean, WB_IsMethodCompilable(JNIEnv* env, jobject o, jobject method, jint comp_level, jboolean is_osr))
 496   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
 497   CHECK_JNI_EXCEPTION_(env, JNI_FALSE);
 498   MutexLockerEx mu(Compile_lock);
 499   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
 500   if (is_osr) {
 501     return CompilationPolicy::can_be_osr_compiled(mh, comp_level);
 502   } else {
 503     return CompilationPolicy::can_be_compiled(mh, comp_level);
 504   }
 505 WB_END
 506 
 507 WB_ENTRY(jboolean, WB_IsMethodQueuedForCompilation(JNIEnv* env, jobject o, jobject method))
 508   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
 509   CHECK_JNI_EXCEPTION_(env, JNI_FALSE);
 510   MutexLockerEx mu(Compile_lock);
 511   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
 512   return mh->queued_for_compilation();
 513 WB_END
 514 
 515 WB_ENTRY(jint, WB_GetMethodCompilationLevel(JNIEnv* env, jobject o, jobject method, jboolean is_osr))
 516   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
 517   CHECK_JNI_EXCEPTION_(env, CompLevel_none);
 518   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
 519   nmethod* code = is_osr ? mh->lookup_osr_nmethod_for(InvocationEntryBci, CompLevel_none, false) : mh->code();
 520   return (code != NULL ? code->comp_level() : CompLevel_none);
 521 WB_END
 522 
 523 WB_ENTRY(void, WB_MakeMethodNotCompilable(JNIEnv* env, jobject o, jobject method, jint comp_level, jboolean is_osr))
 524   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
 525   CHECK_JNI_EXCEPTION(env);
 526   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
 527   if (is_osr) {
 528     mh->set_not_osr_compilable(comp_level, true /* report */, "WhiteBox");
 529   } else {
 530     mh->set_not_compilable(comp_level, true /* report */, "WhiteBox");
 531   }
 532 WB_END
 533 
 534 WB_ENTRY(jint, WB_GetMethodEntryBci(JNIEnv* env, jobject o, jobject method))
 535   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
 536   CHECK_JNI_EXCEPTION_(env, InvocationEntryBci);
 537   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
 538   nmethod* code = mh->lookup_osr_nmethod_for(InvocationEntryBci, CompLevel_none, false);
 539   return (code != NULL && code->is_osr_method() ? code->osr_entry_bci() : InvocationEntryBci);
 540 WB_END
 541 
 542 WB_ENTRY(jboolean, WB_TestSetDontInlineMethod(JNIEnv* env, jobject o, jobject method, jboolean value))
 543   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
 544   CHECK_JNI_EXCEPTION_(env, JNI_FALSE);
 545   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
 546   bool result = mh->dont_inline();
 547   mh->set_dont_inline(value == JNI_TRUE);
 548   return result;
 549 WB_END
 550 
 551 WB_ENTRY(jint, WB_GetCompileQueueSize(JNIEnv* env, jobject o, jint comp_level))
 552   if (comp_level == CompLevel_any) {
 553     return CompileBroker::queue_size(CompLevel_full_optimization) /* C2 */ +
 554         CompileBroker::queue_size(CompLevel_full_profile) /* C1 */;
 555   } else {
 556     return CompileBroker::queue_size(comp_level);
 557   }
 558 WB_END
 559 
 560 WB_ENTRY(jboolean, WB_TestSetForceInlineMethod(JNIEnv* env, jobject o, jobject method, jboolean value))
 561   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
 562   CHECK_JNI_EXCEPTION_(env, JNI_FALSE);
 563   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
 564   bool result = mh->force_inline();
 565   mh->set_force_inline(value == JNI_TRUE);
 566   return result;
 567 WB_END
 568 
 569 WB_ENTRY(jboolean, WB_EnqueueMethodForCompilation(JNIEnv* env, jobject o, jobject method, jint comp_level, jint bci))
 570   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
 571   CHECK_JNI_EXCEPTION_(env, JNI_FALSE);
 572   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
 573   nmethod* nm = CompileBroker::compile_method(mh, bci, comp_level, mh, mh->invocation_count(), "WhiteBox", THREAD);
 574   MutexLockerEx mu(Compile_lock);
 575   return (mh->queued_for_compilation() || nm != NULL);
 576 WB_END
 577 
 578 class AlwaysFalseClosure : public BoolObjectClosure {
 579  public:
 580   bool do_object_b(oop p) { return false; }
 581 };
 582 
 583 static AlwaysFalseClosure always_false;
 584 
 585 WB_ENTRY(void, WB_ClearMethodState(JNIEnv* env, jobject o, jobject method))
 586   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
 587   CHECK_JNI_EXCEPTION(env);
 588   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
 589   MutexLockerEx mu(Compile_lock);
 590   MethodData* mdo = mh->method_data();
 591   MethodCounters* mcs = mh->method_counters();
 592 
 593   if (mdo != NULL) {
 594     mdo->init();
 595     ResourceMark rm;
 596     int arg_count = mdo->method()->size_of_parameters();
 597     for (int i = 0; i < arg_count; i++) {
 598       mdo->set_arg_modified(i, 0);
 599     }
 600     MutexLockerEx mu(mdo->extra_data_lock());
 601     mdo->clean_method_data(&always_false);
 602   }
 603 
 604   mh->clear_not_c1_compilable();
 605   mh->clear_not_c2_compilable();
 606   mh->clear_not_c2_osr_compilable();
 607   NOT_PRODUCT(mh->set_compiled_invocation_count(0));
 608   if (mcs != NULL) {
 609     mcs->backedge_counter()->init();
 610     mcs->invocation_counter()->init();
 611     mcs->set_interpreter_invocation_count(0);
 612     mcs->set_interpreter_throwout_count(0);
 613 
 614 #ifdef TIERED
 615     mcs->set_rate(0.0F);
 616     mh->set_prev_event_count(0);
 617     mh->set_prev_time(0);
 618 #endif
 619   }
 620 WB_END
 621 
 622 template <typename T>
 623 static bool GetVMFlag(JavaThread* thread, JNIEnv* env, jstring name, T* value, bool (*TAt)(const char*, T*, bool, bool)) {
 624   if (name == NULL) {
 625     return false;
 626   }
 627   ThreadToNativeFromVM ttnfv(thread);   // can't be in VM when we call JNI
 628   const char* flag_name = env->GetStringUTFChars(name, NULL);
 629   bool result = (*TAt)(flag_name, value, true, true);
 630   env->ReleaseStringUTFChars(name, flag_name);
 631   return result;
 632 }
 633 
 634 template <typename T>
 635 static bool SetVMFlag(JavaThread* thread, JNIEnv* env, jstring name, T* value, bool (*TAtPut)(const char*, T*, Flag::Flags)) {
 636   if (name == NULL) {
 637     return false;
 638   }
 639   ThreadToNativeFromVM ttnfv(thread);   // can't be in VM when we call JNI
 640   const char* flag_name = env->GetStringUTFChars(name, NULL);
 641   bool result = (*TAtPut)(flag_name, value, Flag::INTERNAL);
 642   env->ReleaseStringUTFChars(name, flag_name);
 643   return result;
 644 }
 645 
 646 template <typename T>
 647 static jobject box(JavaThread* thread, JNIEnv* env, Symbol* name, Symbol* sig, T value) {
 648   ResourceMark rm(thread);
 649   jclass clazz = env->FindClass(name->as_C_string());
 650   CHECK_JNI_EXCEPTION_(env, NULL);
 651   jmethodID methodID = env->GetStaticMethodID(clazz,
 652         vmSymbols::valueOf_name()->as_C_string(),
 653         sig->as_C_string());
 654   CHECK_JNI_EXCEPTION_(env, NULL);
 655   jobject result = env->CallStaticObjectMethod(clazz, methodID, value);
 656   CHECK_JNI_EXCEPTION_(env, NULL);
 657   return result;
 658 }
 659 
 660 static jobject booleanBox(JavaThread* thread, JNIEnv* env, jboolean value) {
 661   return box(thread, env, vmSymbols::java_lang_Boolean(), vmSymbols::Boolean_valueOf_signature(), value);
 662 }
 663 static jobject integerBox(JavaThread* thread, JNIEnv* env, jint value) {
 664   return box(thread, env, vmSymbols::java_lang_Integer(), vmSymbols::Integer_valueOf_signature(), value);
 665 }
 666 static jobject longBox(JavaThread* thread, JNIEnv* env, jlong value) {
 667   return box(thread, env, vmSymbols::java_lang_Long(), vmSymbols::Long_valueOf_signature(), value);
 668 }
 669 /* static jobject floatBox(JavaThread* thread, JNIEnv* env, jfloat value) {
 670   return box(thread, env, vmSymbols::java_lang_Float(), vmSymbols::Float_valueOf_signature(), value);
 671 }*/
 672 static jobject doubleBox(JavaThread* thread, JNIEnv* env, jdouble value) {
 673   return box(thread, env, vmSymbols::java_lang_Double(), vmSymbols::Double_valueOf_signature(), value);
 674 }
 675 
 676 static Flag* getVMFlag(JavaThread* thread, JNIEnv* env, jstring name) {
 677   ThreadToNativeFromVM ttnfv(thread);   // can't be in VM when we call JNI
 678   const char* flag_name = env->GetStringUTFChars(name, NULL);
 679   Flag* result = Flag::find_flag(flag_name, strlen(flag_name), true, true);
 680   env->ReleaseStringUTFChars(name, flag_name);
 681   return result;
 682 }
 683 
 684 WB_ENTRY(jboolean, WB_IsConstantVMFlag(JNIEnv* env, jobject o, jstring name))
 685   Flag* flag = getVMFlag(thread, env, name);
 686   return (flag != NULL) && flag->is_constant_in_binary();
 687 WB_END
 688 
 689 WB_ENTRY(jboolean, WB_IsLockedVMFlag(JNIEnv* env, jobject o, jstring name))
 690   Flag* flag = getVMFlag(thread, env, name);
 691   return (flag != NULL) && !(flag->is_unlocked() || flag->is_unlocker());
 692 WB_END
 693 
 694 WB_ENTRY(jobject, WB_GetBooleanVMFlag(JNIEnv* env, jobject o, jstring name))
 695   bool result;
 696   if (GetVMFlag <bool> (thread, env, name, &result, &CommandLineFlags::boolAt)) {
 697     ThreadToNativeFromVM ttnfv(thread);   // can't be in VM when we call JNI
 698     return booleanBox(thread, env, result);
 699   }
 700   return NULL;
 701 WB_END
 702 
 703 WB_ENTRY(jobject, WB_GetIntxVMFlag(JNIEnv* env, jobject o, jstring name))
 704   intx result;
 705   if (GetVMFlag <intx> (thread, env, name, &result, &CommandLineFlags::intxAt)) {
 706     ThreadToNativeFromVM ttnfv(thread);   // can't be in VM when we call JNI
 707     return longBox(thread, env, result);
 708   }
 709   return NULL;
 710 WB_END
 711 
 712 WB_ENTRY(jobject, WB_GetUintxVMFlag(JNIEnv* env, jobject o, jstring name))
 713   uintx result;
 714   if (GetVMFlag <uintx> (thread, env, name, &result, &CommandLineFlags::uintxAt)) {
 715     ThreadToNativeFromVM ttnfv(thread);   // can't be in VM when we call JNI
 716     return longBox(thread, env, result);
 717   }
 718   return NULL;
 719 WB_END
 720 
 721 WB_ENTRY(jobject, WB_GetUint64VMFlag(JNIEnv* env, jobject o, jstring name))
 722   uint64_t result;
 723   if (GetVMFlag <uint64_t> (thread, env, name, &result, &CommandLineFlags::uint64_tAt)) {
 724     ThreadToNativeFromVM ttnfv(thread);   // can't be in VM when we call JNI
 725     return longBox(thread, env, result);
 726   }
 727   return NULL;
 728 WB_END
 729 
 730 WB_ENTRY(jobject, WB_GetSizeTVMFlag(JNIEnv* env, jobject o, jstring name))
 731   uintx result;
 732   if (GetVMFlag <size_t> (thread, env, name, &result, &CommandLineFlags::size_tAt)) {
 733     ThreadToNativeFromVM ttnfv(thread);   // can't be in VM when we call JNI
 734     return longBox(thread, env, result);
 735   }
 736   return NULL;
 737 WB_END
 738 
 739 WB_ENTRY(jobject, WB_GetDoubleVMFlag(JNIEnv* env, jobject o, jstring name))
 740   double result;
 741   if (GetVMFlag <double> (thread, env, name, &result, &CommandLineFlags::doubleAt)) {
 742     ThreadToNativeFromVM ttnfv(thread);   // can't be in VM when we call JNI
 743     return doubleBox(thread, env, result);
 744   }
 745   return NULL;
 746 WB_END
 747 
 748 WB_ENTRY(jstring, WB_GetStringVMFlag(JNIEnv* env, jobject o, jstring name))
 749   ccstr ccstrResult;
 750   if (GetVMFlag <ccstr> (thread, env, name, &ccstrResult, &CommandLineFlags::ccstrAt)) {
 751     ThreadToNativeFromVM ttnfv(thread);   // can't be in VM when we call JNI
 752     jstring result = env->NewStringUTF(ccstrResult);
 753     CHECK_JNI_EXCEPTION_(env, NULL);
 754     return result;
 755   }
 756   return NULL;
 757 WB_END
 758 
 759 WB_ENTRY(void, WB_SetBooleanVMFlag(JNIEnv* env, jobject o, jstring name, jboolean value))
 760   bool result = value == JNI_TRUE ? true : false;
 761   SetVMFlag <bool> (thread, env, name, &result, &CommandLineFlags::boolAtPut);
 762 WB_END
 763 
 764 WB_ENTRY(void, WB_SetIntxVMFlag(JNIEnv* env, jobject o, jstring name, jlong value))
 765   intx result = value;
 766   SetVMFlag <intx> (thread, env, name, &result, &CommandLineFlags::intxAtPut);
 767 WB_END
 768 
 769 WB_ENTRY(void, WB_SetUintxVMFlag(JNIEnv* env, jobject o, jstring name, jlong value))
 770   uintx result = value;
 771   SetVMFlag <uintx> (thread, env, name, &result, &CommandLineFlags::uintxAtPut);
 772 WB_END
 773 
 774 WB_ENTRY(void, WB_SetUint64VMFlag(JNIEnv* env, jobject o, jstring name, jlong value))
 775   uint64_t result = value;
 776   SetVMFlag <uint64_t> (thread, env, name, &result, &CommandLineFlags::uint64_tAtPut);
 777 WB_END
 778 
 779 WB_ENTRY(void, WB_SetSizeTVMFlag(JNIEnv* env, jobject o, jstring name, jlong value))
 780   size_t result = value;
 781   SetVMFlag <size_t> (thread, env, name, &result, &CommandLineFlags::size_tAtPut);
 782 WB_END
 783 
 784 WB_ENTRY(void, WB_SetDoubleVMFlag(JNIEnv* env, jobject o, jstring name, jdouble value))
 785   double result = value;
 786   SetVMFlag <double> (thread, env, name, &result, &CommandLineFlags::doubleAtPut);
 787 WB_END
 788 
 789 WB_ENTRY(void, WB_SetStringVMFlag(JNIEnv* env, jobject o, jstring name, jstring value))
 790   ThreadToNativeFromVM ttnfv(thread);   // can't be in VM when we call JNI
 791   const char* ccstrValue = (value == NULL) ? NULL : env->GetStringUTFChars(value, NULL);
 792   ccstr ccstrResult = ccstrValue;
 793   bool needFree;
 794   {
 795     ThreadInVMfromNative ttvfn(thread); // back to VM
 796     needFree = SetVMFlag <ccstr> (thread, env, name, &ccstrResult, &CommandLineFlags::ccstrAtPut);
 797   }
 798   if (value != NULL) {
 799     env->ReleaseStringUTFChars(value, ccstrValue);
 800   }
 801   if (needFree) {
 802     FREE_C_HEAP_ARRAY(char, ccstrResult);
 803   }
 804 WB_END
 805 
 806 WB_ENTRY(void, WB_LockCompilation(JNIEnv* env, jobject o, jlong timeout))
 807   WhiteBox::compilation_locked = true;
 808 WB_END
 809 
 810 WB_ENTRY(void, WB_UnlockCompilation(JNIEnv* env, jobject o))
 811   MonitorLockerEx mo(Compilation_lock, Mutex::_no_safepoint_check_flag);
 812   WhiteBox::compilation_locked = false;
 813   mo.notify_all();
 814 WB_END
 815 
 816 void WhiteBox::sweeper_thread_entry(JavaThread* thread, TRAPS) {
 817   guarantee(WhiteBoxAPI, "internal testing API :: WhiteBox has to be enabled");
 818   {
 819     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
 820     NMethodSweeper::_should_sweep = true;
 821   }
 822   NMethodSweeper::possibly_sweep();
 823 }
 824 
 825 JavaThread* WhiteBox::create_sweeper_thread(TRAPS) {
 826   // create sweeper thread w/ custom entry -- one iteration instead of loop
 827   CodeCacheSweeperThread* sweeper_thread = new CodeCacheSweeperThread();
 828   sweeper_thread->set_entry_point(&WhiteBox::sweeper_thread_entry);
 829 
 830   // create j.l.Thread object and associate it w/ sweeper thread
 831   {
 832     // inherit deamon property from current thread
 833     bool is_daemon = java_lang_Thread::is_daemon(JavaThread::current()->threadObj());
 834 
 835     HandleMark hm(THREAD);
 836     Handle thread_group(THREAD, Universe::system_thread_group());
 837     const char* name = "WB Sweeper thread";
 838     sweeper_thread->allocate_threadObj(thread_group, name, is_daemon, THREAD);
 839   }
 840 
 841   {
 842     MutexLocker mu(Threads_lock, THREAD);
 843     Threads::add(sweeper_thread);
 844   }
 845   return sweeper_thread;
 846 }
 847 
 848 WB_ENTRY(jobject, WB_ForceNMethodSweep(JNIEnv* env, jobject o))
 849   JavaThread* sweeper_thread = WhiteBox::create_sweeper_thread(Thread::current());
 850   if (sweeper_thread == NULL) {
 851     return NULL;
 852   }
 853   jobject result = JNIHandles::make_local(env, sweeper_thread->threadObj());
 854   Thread::start(sweeper_thread);
 855   return result;
 856 WB_END
 857 
 858 WB_ENTRY(jboolean, WB_IsInStringTable(JNIEnv* env, jobject o, jstring javaString))
 859   ResourceMark rm(THREAD);
 860   int len;
 861   jchar* name = java_lang_String::as_unicode_string(JNIHandles::resolve(javaString), len, CHECK_false);
 862   return (StringTable::lookup(name, len) != NULL);
 863 WB_END
 864 
 865 WB_ENTRY(void, WB_FullGC(JNIEnv* env, jobject o))
 866   Universe::heap()->collector_policy()->set_should_clear_all_soft_refs(true);
 867   Universe::heap()->collect(GCCause::_last_ditch_collection);
 868 #if INCLUDE_ALL_GCS
 869   if (UseG1GC) {
 870     // Needs to be cleared explicitly for G1
 871     Universe::heap()->collector_policy()->set_should_clear_all_soft_refs(false);
 872   }
 873 #endif // INCLUDE_ALL_GCS
 874 WB_END
 875 
 876 WB_ENTRY(void, WB_YoungGC(JNIEnv* env, jobject o))
 877   Universe::heap()->collect(GCCause::_wb_young_gc);
 878 WB_END
 879 
 880 WB_ENTRY(void, WB_ReadReservedMemory(JNIEnv* env, jobject o))
 881   // static+volatile in order to force the read to happen
 882   // (not be eliminated by the compiler)
 883   static char c;
 884   static volatile char* p;
 885 
 886   p = os::reserve_memory(os::vm_allocation_granularity(), NULL, 0);
 887   if (p == NULL) {
 888     THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), "Failed to reserve memory");
 889   }
 890 
 891   c = *p;
 892 WB_END
 893 
 894 WB_ENTRY(jstring, WB_GetCPUFeatures(JNIEnv* env, jobject o))
 895   const char* cpu_features = VM_Version::cpu_features();
 896   ThreadToNativeFromVM ttn(thread);
 897   jstring features_string = env->NewStringUTF(cpu_features);
 898 
 899   CHECK_JNI_EXCEPTION_(env, NULL);
 900 
 901   return features_string;
 902 WB_END
 903 
 904 int WhiteBox::get_blob_type(const CodeBlob* code) {
 905   guarantee(WhiteBoxAPI, "internal testing API :: WhiteBox has to be enabled");
 906   return CodeCache::get_code_heap(code)->code_blob_type();
 907 }
 908 
 909 CodeHeap* WhiteBox::get_code_heap(int blob_type) {
 910   guarantee(WhiteBoxAPI, "internal testing API :: WhiteBox has to be enabled");
 911   return CodeCache::get_code_heap(blob_type);
 912 }
 913 
 914 struct CodeBlobStub {
 915   CodeBlobStub(const CodeBlob* blob) :
 916       name(os::strdup(blob->name())),
 917       size(blob->size()),
 918       blob_type(WhiteBox::get_blob_type(blob)) { }
 919   ~CodeBlobStub() { os::free((void*) name); }
 920   const char* const name;
 921   const int         size;
 922   const int         blob_type;
 923 };
 924 
 925 static jobjectArray codeBlob2objectArray(JavaThread* thread, JNIEnv* env, CodeBlobStub* cb) {
 926   jclass clazz = env->FindClass(vmSymbols::java_lang_Object()->as_C_string());
 927   CHECK_JNI_EXCEPTION_(env, NULL);
 928   jobjectArray result = env->NewObjectArray(3, clazz, NULL);
 929 
 930   jstring name = env->NewStringUTF(cb->name);
 931   CHECK_JNI_EXCEPTION_(env, NULL);
 932   env->SetObjectArrayElement(result, 0, name);
 933 
 934   jobject obj = integerBox(thread, env, cb->size);
 935   CHECK_JNI_EXCEPTION_(env, NULL);
 936   env->SetObjectArrayElement(result, 1, obj);
 937 
 938   obj = integerBox(thread, env, cb->blob_type);
 939   CHECK_JNI_EXCEPTION_(env, NULL);
 940   env->SetObjectArrayElement(result, 2, obj);
 941 
 942   return result;
 943 }
 944 
 945 WB_ENTRY(jobjectArray, WB_GetNMethod(JNIEnv* env, jobject o, jobject method, jboolean is_osr))
 946   ResourceMark rm(THREAD);
 947   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
 948   CHECK_JNI_EXCEPTION_(env, NULL);
 949   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
 950   nmethod* code = is_osr ? mh->lookup_osr_nmethod_for(InvocationEntryBci, CompLevel_none, false) : mh->code();
 951   jobjectArray result = NULL;
 952   if (code == NULL) {
 953     return result;
 954   }
 955   int insts_size = code->insts_size();
 956 
 957   ThreadToNativeFromVM ttn(thread);
 958   jclass clazz = env->FindClass(vmSymbols::java_lang_Object()->as_C_string());
 959   CHECK_JNI_EXCEPTION_(env, NULL);
 960   result = env->NewObjectArray(4, clazz, NULL);
 961   if (result == NULL) {
 962     return result;
 963   }
 964 
 965   CodeBlobStub stub(code);
 966   jobjectArray codeBlob = codeBlob2objectArray(thread, env, &stub);
 967   env->SetObjectArrayElement(result, 0, codeBlob);
 968 
 969   jobject level = integerBox(thread, env, code->comp_level());
 970   CHECK_JNI_EXCEPTION_(env, NULL);
 971   env->SetObjectArrayElement(result, 1, level);
 972 
 973   jbyteArray insts = env->NewByteArray(insts_size);
 974   CHECK_JNI_EXCEPTION_(env, NULL);
 975   env->SetByteArrayRegion(insts, 0, insts_size, (jbyte*) code->insts_begin());
 976   env->SetObjectArrayElement(result, 2, insts);
 977 
 978   jobject id = integerBox(thread, env, code->compile_id());
 979   CHECK_JNI_EXCEPTION_(env, NULL);
 980   env->SetObjectArrayElement(result, 3, id);
 981 
 982   return result;
 983 WB_END
 984 
 985 CodeBlob* WhiteBox::allocate_code_blob(int size, int blob_type) {
 986   guarantee(WhiteBoxAPI, "internal testing API :: WhiteBox has to be enabled");
 987   BufferBlob* blob;
 988   int full_size = CodeBlob::align_code_offset(sizeof(BufferBlob));
 989   if (full_size < size) {
 990     full_size += round_to(size - full_size, oopSize);
 991   }
 992   {
 993     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
 994     blob = (BufferBlob*) CodeCache::allocate(full_size, blob_type);
 995     ::new (blob) BufferBlob("WB::DummyBlob", full_size);
 996   }
 997   // Track memory usage statistic after releasing CodeCache_lock
 998   MemoryService::track_code_cache_memory_usage();
 999   return blob;
1000 }
1001 
1002 WB_ENTRY(jlong, WB_AllocateCodeBlob(JNIEnv* env, jobject o, jint size, jint blob_type))
1003     return (jlong) WhiteBox::allocate_code_blob(size, blob_type);
1004 WB_END
1005 
1006 WB_ENTRY(void, WB_FreeCodeBlob(JNIEnv* env, jobject o, jlong addr))
1007     BufferBlob::free((BufferBlob*) addr);
1008 WB_END
1009 
1010 WB_ENTRY(jobjectArray, WB_GetCodeHeapEntries(JNIEnv* env, jobject o, jint blob_type))
1011   ResourceMark rm;
1012   GrowableArray<CodeBlobStub*> blobs;
1013   {
1014     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1015     CodeHeap* heap = WhiteBox::get_code_heap(blob_type);
1016     if (heap == NULL) {
1017       return NULL;
1018     }
1019     for (CodeBlob* cb = (CodeBlob*) heap->first();
1020          cb != NULL; cb = (CodeBlob*) heap->next(cb)) {
1021       CodeBlobStub* stub = NEW_RESOURCE_OBJ(CodeBlobStub);
1022       new (stub) CodeBlobStub(cb);
1023       blobs.append(stub);
1024     }
1025   }
1026   if (blobs.length() == 0) {
1027     return NULL;
1028   }
1029   ThreadToNativeFromVM ttn(thread);
1030   jobjectArray result = NULL;
1031   jclass clazz = env->FindClass(vmSymbols::java_lang_Object()->as_C_string());
1032   CHECK_JNI_EXCEPTION_(env, NULL);
1033   result = env->NewObjectArray(blobs.length(), clazz, NULL);
1034   if (result == NULL) {
1035     return result;
1036   }
1037   int i = 0;
1038   for (GrowableArrayIterator<CodeBlobStub*> it = blobs.begin();
1039        it != blobs.end(); ++it) {
1040     jobjectArray obj = codeBlob2objectArray(thread, env, *it);
1041     env->SetObjectArrayElement(result, i, obj);
1042     ++i;
1043   }
1044   return result;
1045 WB_END
1046 
1047 WB_ENTRY(jint, WB_GetCompilationActivityMode(JNIEnv* env, jobject o))
1048   return CompileBroker::get_compilation_activity_mode();
1049 WB_END
1050 
1051 WB_ENTRY(jobjectArray, WB_GetCodeBlob(JNIEnv* env, jobject o, jlong addr))
1052     ThreadToNativeFromVM ttn(thread);
1053     CodeBlobStub stub((CodeBlob*) addr);
1054     return codeBlob2objectArray(thread, env, &stub);
1055 WB_END
1056 
1057 WB_ENTRY(jlong, WB_GetThreadStackSize(JNIEnv* env, jobject o))
1058   return (jlong) Thread::current()->stack_size();
1059 WB_END
1060 
1061 WB_ENTRY(jlong, WB_GetThreadRemainingStackSize(JNIEnv* env, jobject o))
1062   JavaThread* t = JavaThread::current();
1063   return (jlong) t->stack_available(os::current_stack_pointer()) - (jlong) StackShadowPages * os::vm_page_size();
1064 WB_END
1065 
1066 int WhiteBox::array_bytes_to_length(size_t bytes) {
1067   return Array<u1>::bytes_to_length(bytes);
1068 }
1069 
1070 WB_ENTRY(jlong, WB_AllocateMetaspace(JNIEnv* env, jobject wb, jobject class_loader, jlong size))
1071   if (size < 0) {
1072     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1073         err_msg("WB_AllocateMetaspace: size is negative: " JLONG_FORMAT, size));
1074   }
1075 
1076   oop class_loader_oop = JNIHandles::resolve(class_loader);
1077   ClassLoaderData* cld = class_loader_oop != NULL
1078       ? java_lang_ClassLoader::loader_data(class_loader_oop)
1079       : ClassLoaderData::the_null_class_loader_data();
1080 
1081   void* metadata = MetadataFactory::new_writeable_array<u1>(cld, WhiteBox::array_bytes_to_length((size_t)size), thread);
1082 
1083   return (jlong)(uintptr_t)metadata;
1084 WB_END
1085 
1086 WB_ENTRY(void, WB_FreeMetaspace(JNIEnv* env, jobject wb, jobject class_loader, jlong addr, jlong size))
1087   oop class_loader_oop = JNIHandles::resolve(class_loader);
1088   ClassLoaderData* cld = class_loader_oop != NULL
1089       ? java_lang_ClassLoader::loader_data(class_loader_oop)
1090       : ClassLoaderData::the_null_class_loader_data();
1091 
1092   MetadataFactory::free_array(cld, (Array<u1>*)(uintptr_t)addr);
1093 WB_END
1094 
1095 WB_ENTRY(jlong, WB_IncMetaspaceCapacityUntilGC(JNIEnv* env, jobject wb, jlong inc))
1096   if (inc < 0) {
1097     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1098         err_msg("WB_IncMetaspaceCapacityUntilGC: inc is negative: " JLONG_FORMAT, inc));
1099   }
1100 
1101   jlong max_size_t = (jlong) ((size_t) -1);
1102   if (inc > max_size_t) {
1103     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1104         err_msg("WB_IncMetaspaceCapacityUntilGC: inc does not fit in size_t: " JLONG_FORMAT, inc));
1105   }
1106 
1107   size_t new_cap_until_GC = 0;
1108   size_t aligned_inc = align_size_down((size_t) inc, Metaspace::commit_alignment());
1109   bool success = MetaspaceGC::inc_capacity_until_GC(aligned_inc, &new_cap_until_GC);
1110   if (!success) {
1111     THROW_MSG_0(vmSymbols::java_lang_IllegalStateException(),
1112                 "WB_IncMetaspaceCapacityUntilGC: could not increase capacity until GC "
1113                 "due to contention with another thread");
1114   }
1115   return (jlong) new_cap_until_GC;
1116 WB_END
1117 
1118 WB_ENTRY(jlong, WB_MetaspaceCapacityUntilGC(JNIEnv* env, jobject wb))
1119   return (jlong) MetaspaceGC::capacity_until_GC();
1120 WB_END
1121 
1122 WB_ENTRY(void, WB_AssertMatchingSafepointCalls(JNIEnv* env, jobject o, jboolean mutexSafepointValue, jboolean attemptedNoSafepointValue))
1123   Monitor::SafepointCheckRequired sfpt_check_required = mutexSafepointValue ?
1124                                            Monitor::_safepoint_check_always :
1125                                            Monitor::_safepoint_check_never;
1126   MutexLockerEx ml(new Mutex(Mutex::leaf, "SFPT_Test_lock", true, sfpt_check_required),
1127                    attemptedNoSafepointValue == JNI_TRUE);
1128 WB_END
1129 
1130 WB_ENTRY(jboolean, WB_IsMonitorInflated(JNIEnv* env, jobject wb, jobject obj))
1131   oop obj_oop = JNIHandles::resolve(obj);
1132   return (jboolean) obj_oop->mark()->has_monitor();
1133 WB_END
1134 
1135 WB_ENTRY(void, WB_ForceSafepoint(JNIEnv* env, jobject wb))
1136   VM_ForceSafepoint force_safepoint_op;
1137   VMThread::execute(&force_safepoint_op);
1138 WB_END
1139 
1140 //Some convenience methods to deal with objects from java
1141 int WhiteBox::offset_for_field(const char* field_name, oop object,
1142     Symbol* signature_symbol) {
1143   assert(field_name != NULL && strlen(field_name) > 0, "Field name not valid");
1144   Thread* THREAD = Thread::current();
1145 
1146   //Get the class of our object
1147   Klass* arg_klass = object->klass();
1148   //Turn it into an instance-klass
1149   InstanceKlass* ik = InstanceKlass::cast(arg_klass);
1150 
1151   //Create symbols to look for in the class
1152   TempNewSymbol name_symbol = SymbolTable::lookup(field_name, (int) strlen(field_name),
1153       THREAD);
1154 
1155   //To be filled in with an offset of the field we're looking for
1156   fieldDescriptor fd;
1157 
1158   Klass* res = ik->find_field(name_symbol, signature_symbol, &fd);
1159   if (res == NULL) {
1160     tty->print_cr("Invalid layout of %s at %s", ik->external_name(),
1161         name_symbol->as_C_string());
1162     fatal("Invalid layout of preloaded class");
1163   }
1164 
1165   //fetch the field at the offset we've found
1166   int dest_offset = fd.offset();
1167 
1168   return dest_offset;
1169 }
1170 
1171 
1172 const char* WhiteBox::lookup_jstring(const char* field_name, oop object) {
1173   int offset = offset_for_field(field_name, object,
1174       vmSymbols::string_signature());
1175   oop string = object->obj_field(offset);
1176   if (string == NULL) {
1177     return NULL;
1178   }
1179   const char* ret = java_lang_String::as_utf8_string(string);
1180   return ret;
1181 }
1182 
1183 bool WhiteBox::lookup_bool(const char* field_name, oop object) {
1184   int offset =
1185       offset_for_field(field_name, object, vmSymbols::bool_signature());
1186   bool ret = (object->bool_field(offset) == JNI_TRUE);
1187   return ret;
1188 }
1189 
1190 void WhiteBox::register_methods(JNIEnv* env, jclass wbclass, JavaThread* thread, JNINativeMethod* method_array, int method_count) {
1191   ResourceMark rm;
1192   ThreadToNativeFromVM ttnfv(thread); // can't be in VM when we call JNI
1193 
1194   //  one by one registration natives for exception catching
1195   jclass no_such_method_error_klass = env->FindClass(vmSymbols::java_lang_NoSuchMethodError()->as_C_string());
1196   CHECK_JNI_EXCEPTION(env);
1197   for (int i = 0, n = method_count; i < n; ++i) {
1198     // Skip dummy entries
1199     if (method_array[i].fnPtr == NULL) continue;
1200     if (env->RegisterNatives(wbclass, &method_array[i], 1) != 0) {
1201       jthrowable throwable_obj = env->ExceptionOccurred();
1202       if (throwable_obj != NULL) {
1203         env->ExceptionClear();
1204         if (env->IsInstanceOf(throwable_obj, no_such_method_error_klass)) {
1205           // NoSuchMethodError is thrown when a method can't be found or a method is not native.
1206           // Ignoring the exception since it is not preventing use of other WhiteBox methods.
1207           tty->print_cr("Warning: 'NoSuchMethodError' on register of sun.hotspot.WhiteBox::%s%s",
1208               method_array[i].name, method_array[i].signature);
1209         }
1210       } else {
1211         // Registration failed unexpectedly.
1212         tty->print_cr("Warning: unexpected error on register of sun.hotspot.WhiteBox::%s%s. All methods will be unregistered",
1213             method_array[i].name, method_array[i].signature);
1214         env->UnregisterNatives(wbclass);
1215         break;
1216       }
1217     }
1218   }
1219 }
1220 
1221 #define CC (char*)
1222 
1223 static JNINativeMethod methods[] = {
1224   {CC"getObjectAddress",   CC"(Ljava/lang/Object;)J", (void*)&WB_GetObjectAddress  },
1225   {CC"getObjectSize",      CC"(Ljava/lang/Object;)J", (void*)&WB_GetObjectSize     },
1226   {CC"isObjectInOldGen",   CC"(Ljava/lang/Object;)Z", (void*)&WB_isObjectInOldGen  },
1227   {CC"getHeapOopSize",     CC"()I",                   (void*)&WB_GetHeapOopSize    },
1228   {CC"getVMPageSize",      CC"()I",                   (void*)&WB_GetVMPageSize     },
1229   {CC"getVMLargePageSize", CC"()J",                   (void*)&WB_GetVMLargePageSize},
1230   {CC"isClassAlive0",      CC"(Ljava/lang/String;)Z", (void*)&WB_IsClassAlive      },
1231   {CC"parseCommandLine",
1232       CC"(Ljava/lang/String;C[Lsun/hotspot/parser/DiagnosticCommand;)[Ljava/lang/Object;",
1233       (void*) &WB_ParseCommandLine
1234   },
1235   {CC"addToBootstrapClassLoaderSearch", CC"(Ljava/lang/String;)V",
1236                                                       (void*)&WB_AddToBootstrapClassLoaderSearch},
1237   {CC"addToSystemClassLoaderSearch",    CC"(Ljava/lang/String;)V",
1238                                                       (void*)&WB_AddToSystemClassLoaderSearch},
1239   {CC"getCompressedOopsMaxHeapSize", CC"()J",
1240       (void*)&WB_GetCompressedOopsMaxHeapSize},
1241   {CC"printHeapSizes",     CC"()V",                   (void*)&WB_PrintHeapSizes    },
1242   {CC"runMemoryUnitTests", CC"()V",                   (void*)&WB_RunMemoryUnitTests},
1243   {CC"readFromNoaccessArea",CC"()V",                  (void*)&WB_ReadFromNoaccessArea},
1244   {CC"stressVirtualSpaceResize",CC"(JJJ)I",           (void*)&WB_StressVirtualSpaceResize},
1245 #if INCLUDE_ALL_GCS
1246   {CC"g1InConcurrentMark", CC"()Z",                   (void*)&WB_G1InConcurrentMark},
1247   {CC"g1IsHumongous",      CC"(Ljava/lang/Object;)Z", (void*)&WB_G1IsHumongous     },
1248   {CC"g1NumFreeRegions",   CC"()J",                   (void*)&WB_G1NumFreeRegions  },
1249   {CC"g1RegionSize",       CC"()I",                   (void*)&WB_G1RegionSize      },
1250   {CC"g1StartConcMarkCycle",       CC"()Z",           (void*)&WB_G1StartMarkCycle  },
1251 #endif // INCLUDE_ALL_GCS
1252 #if INCLUDE_NMT
1253   {CC"NMTMalloc",           CC"(J)J",                 (void*)&WB_NMTMalloc          },
1254   {CC"NMTMallocWithPseudoStack", CC"(JI)J",           (void*)&WB_NMTMallocWithPseudoStack},
1255   {CC"NMTFree",             CC"(J)V",                 (void*)&WB_NMTFree            },
1256   {CC"NMTReserveMemory",    CC"(J)J",                 (void*)&WB_NMTReserveMemory   },
1257   {CC"NMTCommitMemory",     CC"(JJ)V",                (void*)&WB_NMTCommitMemory    },
1258   {CC"NMTUncommitMemory",   CC"(JJ)V",                (void*)&WB_NMTUncommitMemory  },
1259   {CC"NMTReleaseMemory",    CC"(JJ)V",                (void*)&WB_NMTReleaseMemory   },
1260   {CC"NMTIsDetailSupported",CC"()Z",                  (void*)&WB_NMTIsDetailSupported},
1261   {CC"NMTChangeTrackingLevel", CC"()Z",               (void*)&WB_NMTChangeTrackingLevel},
1262   {CC"NMTGetHashSize",      CC"()I",                  (void*)&WB_NMTGetHashSize     },
1263 #endif // INCLUDE_NMT
1264   {CC"deoptimizeFrames",   CC"(Z)I",                  (void*)&WB_DeoptimizeFrames  },
1265   {CC"deoptimizeAll",      CC"()V",                   (void*)&WB_DeoptimizeAll     },
1266   {CC"deoptimizeMethod",   CC"(Ljava/lang/reflect/Executable;Z)I",
1267                                                       (void*)&WB_DeoptimizeMethod  },
1268   {CC"isMethodCompiled",   CC"(Ljava/lang/reflect/Executable;Z)Z",
1269                                                       (void*)&WB_IsMethodCompiled  },
1270   {CC"isMethodCompilable", CC"(Ljava/lang/reflect/Executable;IZ)Z",
1271                                                       (void*)&WB_IsMethodCompilable},
1272   {CC"isMethodQueuedForCompilation",
1273       CC"(Ljava/lang/reflect/Executable;)Z",          (void*)&WB_IsMethodQueuedForCompilation},
1274   {CC"makeMethodNotCompilable",
1275       CC"(Ljava/lang/reflect/Executable;IZ)V",        (void*)&WB_MakeMethodNotCompilable},
1276   {CC"testSetDontInlineMethod",
1277       CC"(Ljava/lang/reflect/Executable;Z)Z",         (void*)&WB_TestSetDontInlineMethod},
1278   {CC"getMethodCompilationLevel",
1279       CC"(Ljava/lang/reflect/Executable;Z)I",         (void*)&WB_GetMethodCompilationLevel},
1280   {CC"getMethodEntryBci",
1281       CC"(Ljava/lang/reflect/Executable;)I",          (void*)&WB_GetMethodEntryBci},
1282   {CC"getCompileQueueSize",
1283       CC"(I)I",                                       (void*)&WB_GetCompileQueueSize},
1284   {CC"testSetForceInlineMethod",
1285       CC"(Ljava/lang/reflect/Executable;Z)Z",         (void*)&WB_TestSetForceInlineMethod},
1286   {CC"enqueueMethodForCompilation",
1287       CC"(Ljava/lang/reflect/Executable;II)Z",        (void*)&WB_EnqueueMethodForCompilation},
1288   {CC"clearMethodState",
1289       CC"(Ljava/lang/reflect/Executable;)V",          (void*)&WB_ClearMethodState},
1290   {CC"lockCompilation",    CC"()V",                   (void*)&WB_LockCompilation},
1291   {CC"unlockCompilation",  CC"()V",                   (void*)&WB_UnlockCompilation},
1292   {CC"isConstantVMFlag",   CC"(Ljava/lang/String;)Z", (void*)&WB_IsConstantVMFlag},
1293   {CC"isLockedVMFlag",     CC"(Ljava/lang/String;)Z", (void*)&WB_IsLockedVMFlag},
1294   {CC"setBooleanVMFlag",   CC"(Ljava/lang/String;Z)V",(void*)&WB_SetBooleanVMFlag},
1295   {CC"setIntxVMFlag",      CC"(Ljava/lang/String;J)V",(void*)&WB_SetIntxVMFlag},
1296   {CC"setUintxVMFlag",     CC"(Ljava/lang/String;J)V",(void*)&WB_SetUintxVMFlag},
1297   {CC"setUint64VMFlag",    CC"(Ljava/lang/String;J)V",(void*)&WB_SetUint64VMFlag},
1298   {CC"setSizeTVMFlag",     CC"(Ljava/lang/String;J)V",(void*)&WB_SetSizeTVMFlag},
1299   {CC"setDoubleVMFlag",    CC"(Ljava/lang/String;D)V",(void*)&WB_SetDoubleVMFlag},
1300   {CC"setStringVMFlag",    CC"(Ljava/lang/String;Ljava/lang/String;)V",
1301                                                       (void*)&WB_SetStringVMFlag},
1302   {CC"getBooleanVMFlag",   CC"(Ljava/lang/String;)Ljava/lang/Boolean;",
1303                                                       (void*)&WB_GetBooleanVMFlag},
1304   {CC"getIntxVMFlag",      CC"(Ljava/lang/String;)Ljava/lang/Long;",
1305                                                       (void*)&WB_GetIntxVMFlag},
1306   {CC"getUintxVMFlag",     CC"(Ljava/lang/String;)Ljava/lang/Long;",
1307                                                       (void*)&WB_GetUintxVMFlag},
1308   {CC"getUint64VMFlag",    CC"(Ljava/lang/String;)Ljava/lang/Long;",
1309                                                       (void*)&WB_GetUint64VMFlag},
1310   {CC"getSizeTVMFlag",     CC"(Ljava/lang/String;)Ljava/lang/Long;",
1311                                                       (void*)&WB_GetSizeTVMFlag},
1312   {CC"getDoubleVMFlag",    CC"(Ljava/lang/String;)Ljava/lang/Double;",
1313                                                       (void*)&WB_GetDoubleVMFlag},
1314   {CC"getStringVMFlag",    CC"(Ljava/lang/String;)Ljava/lang/String;",
1315                                                       (void*)&WB_GetStringVMFlag},
1316   {CC"isInStringTable",    CC"(Ljava/lang/String;)Z", (void*)&WB_IsInStringTable  },
1317   {CC"fullGC",   CC"()V",                             (void*)&WB_FullGC },
1318   {CC"youngGC",  CC"()V",                             (void*)&WB_YoungGC },
1319   {CC"readReservedMemory", CC"()V",                   (void*)&WB_ReadReservedMemory },
1320   {CC"allocateMetaspace",
1321      CC"(Ljava/lang/ClassLoader;J)J",                 (void*)&WB_AllocateMetaspace },
1322   {CC"freeMetaspace",
1323      CC"(Ljava/lang/ClassLoader;JJ)V",                (void*)&WB_FreeMetaspace },
1324   {CC"incMetaspaceCapacityUntilGC", CC"(J)J",         (void*)&WB_IncMetaspaceCapacityUntilGC },
1325   {CC"metaspaceCapacityUntilGC", CC"()J",             (void*)&WB_MetaspaceCapacityUntilGC },
1326   {CC"getCPUFeatures",     CC"()Ljava/lang/String;",  (void*)&WB_GetCPUFeatures     },
1327   {CC"getNMethod",         CC"(Ljava/lang/reflect/Executable;Z)[Ljava/lang/Object;",
1328                                                       (void*)&WB_GetNMethod         },
1329   {CC"forceNMethodSweep0", CC"()Ljava/lang/Thread;",  (void*)&WB_ForceNMethodSweep  },
1330   {CC"allocateCodeBlob",   CC"(II)J",                 (void*)&WB_AllocateCodeBlob   },
1331   {CC"freeCodeBlob",       CC"(J)V",                  (void*)&WB_FreeCodeBlob       },
1332   {CC"getCodeHeapEntries", CC"(I)[Ljava/lang/Object;",(void*)&WB_GetCodeHeapEntries },
1333   {CC"getCompilationActivityMode",
1334                            CC"()I",                   (void*)&WB_GetCompilationActivityMode},
1335   {CC"getCodeBlob",        CC"(J)[Ljava/lang/Object;",(void*)&WB_GetCodeBlob        },
1336   {CC"getThreadStackSize", CC"()J",                   (void*)&WB_GetThreadStackSize },
1337   {CC"getThreadRemainingStackSize", CC"()J",          (void*)&WB_GetThreadRemainingStackSize },
1338   {CC"assertMatchingSafepointCalls", CC"(ZZ)V",       (void*)&WB_AssertMatchingSafepointCalls },
1339   {CC"isMonitorInflated",  CC"(Ljava/lang/Object;)Z", (void*)&WB_IsMonitorInflated  },
1340   {CC"forceSafepoint",     CC"()V",                   (void*)&WB_ForceSafepoint     },
1341 };
1342 
1343 #undef CC
1344 
1345 JVM_ENTRY(void, JVM_RegisterWhiteBoxMethods(JNIEnv* env, jclass wbclass))
1346   {
1347     if (WhiteBoxAPI) {
1348       // Make sure that wbclass is loaded by the null classloader
1349       instanceKlassHandle ikh = instanceKlassHandle(JNIHandles::resolve(wbclass)->klass());
1350       Handle loader(ikh->class_loader());
1351       if (loader.is_null()) {
1352         WhiteBox::register_methods(env, wbclass, thread, methods, sizeof(methods) / sizeof(methods[0]));
1353         WhiteBox::register_extended(env, wbclass, thread);
1354         WhiteBox::set_used();
1355       }
1356     }
1357   }
1358 JVM_END