Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright 2001-2009 Sun Microsystems, Inc.  All Rights Reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

  * CA 95054 USA or visit www.sun.com if you need additional information or

  * have any questions.

  *

  */

 // Inline allocation implementations.

 void CollectedHeap::post_allocation_setup_common(KlassHandle klass,

                                                  HeapWord* obj,

                                                  size_t size) {

   post_allocation_setup_no_klass_install(klass, obj, size);

   post_allocation_install_obj_klass(klass, oop(obj), (int) size);

 }

 void CollectedHeap::post_allocation_setup_no_klass_install(KlassHandle klass,

                                                            HeapWord* objPtr,

                                                            size_t size) {

   oop obj = (oop)objPtr;

   assert(obj != NULL, "NULL object pointer");

   if (UseBiasedLocking && (klass() != NULL)) {

     obj->set_mark(klass->prototype_header());

   } else {

     // May be bootstrapping

     obj->set_mark(markOopDesc::prototype());

   }

 }

 void CollectedHeap::post_allocation_install_obj_klass(KlassHandle klass,

                                                    oop obj,

                                                    int size) {

   // These asserts are kind of complicated because of klassKlass

   // and the beginning of the world.

   assert(klass() != NULL || !Universe::is_fully_initialized(), "NULL klass");

   assert(klass() == NULL || klass()->is_klass(), "not a klass");

   assert(klass() == NULL || klass()->klass_part() != NULL, "not a klass");

   assert(obj != NULL, "NULL object pointer");

   obj->set_klass(klass());

   assert(!Universe::is_fully_initialized() || obj->blueprint() != NULL,

          "missing blueprint");

 }

 // Support for jvmti and dtrace

 inline void post_allocation_notify(KlassHandle klass, oop obj) {

   // support low memory notifications (no-op if not enabled)

   LowMemoryDetector::detect_low_memory_for_collected_pools();

   // support for JVMTI VMObjectAlloc event (no-op if not enabled)

   JvmtiExport::vm_object_alloc_event_collector(obj);

   if (DTraceAllocProbes) {

     // support for Dtrace object alloc event (no-op most of the time)

     if (klass() != NULL && klass()->klass_part()->name() != NULL) {

       SharedRuntime::dtrace_object_alloc(obj);

     }

   }

 }

 void CollectedHeap::post_allocation_setup_obj(KlassHandle klass,

                                               HeapWord* obj,

                                               size_t size) {

   post_allocation_setup_common(klass, obj, size);

   assert(Universe::is_bootstrapping() ||

          !((oop)obj)->blueprint()->oop_is_array(), "must not be an array");

   // notify jvmti and dtrace

   post_allocation_notify(klass, (oop)obj);

 }

 void CollectedHeap::post_allocation_setup_array(KlassHandle klass,

                                                 HeapWord* obj,

                                                 size_t size,

                                                 int length) {

   // Set array length before setting the _klass field

   // in post_allocation_setup_common() because the klass field

   // indicates that the object is parsable by concurrent GC.

   assert(length >= 0, "length should be non-negative");

   ((arrayOop)obj)->set_length(length);

   post_allocation_setup_common(klass, obj, size);

   assert(((oop)obj)->blueprint()->oop_is_array(), "must be an array");

   // notify jvmti and dtrace (must be after length is set for dtrace)

   post_allocation_notify(klass, (oop)obj);

 }

 HeapWord* CollectedHeap::common_mem_allocate_noinit(size_t size, bool is_noref, TRAPS) {

   // Clear unhandled oops for memory allocation.  Memory allocation might

   // not take out a lock if from tlab, so clear here.

   CHECK_UNHANDLED_OOPS_ONLY(THREAD->clear_unhandled_oops();)

   if (HAS_PENDING_EXCEPTION) {

     NOT_PRODUCT(guarantee(false, "Should not allocate with exception pending"));

     return NULL;  // caller does a CHECK_0 too

   }

   // We may want to update this, is_noref objects might not be allocated in TLABs.

   HeapWord* result = NULL;

   if (UseTLAB) {

     result = CollectedHeap::allocate_from_tlab(THREAD, size);

     if (result != NULL) {

       assert(!HAS_PENDING_EXCEPTION,

              "Unexpected exception, will result in uninitialized storage");

       return result;

     }

   }

   bool gc_overhead_limit_was_exceeded = false;

   result = Universe::heap()->mem_allocate(size,

                                           is_noref,

                                           false,

                                           &gc_overhead_limit_was_exceeded);

   if (result != NULL) {

     NOT_PRODUCT(Universe::heap()->

       check_for_non_bad_heap_word_value(result, size));

     assert(!HAS_PENDING_EXCEPTION,

            "Unexpected exception, will result in uninitialized storage");

     return result;

   }

   if (!gc_overhead_limit_was_exceeded) {

     // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support

     report_java_out_of_memory("Java heap space");

     if (JvmtiExport::should_post_resource_exhausted()) {

       JvmtiExport::post_resource_exhausted(

         JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_JAVA_HEAP,

         "Java heap space");

     }

     THROW_OOP_0(Universe::out_of_memory_error_java_heap());

   } else {

     // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support

     report_java_out_of_memory("GC overhead limit exceeded");

     if (JvmtiExport::should_post_resource_exhausted()) {

       JvmtiExport::post_resource_exhausted(

         JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_JAVA_HEAP,

         "GC overhead limit exceeded");

     }

     THROW_OOP_0(Universe::out_of_memory_error_gc_overhead_limit());

   }

 }

 HeapWord* CollectedHeap::common_mem_allocate_init(size_t size, bool is_noref, TRAPS) {

   HeapWord* obj = common_mem_allocate_noinit(size, is_noref, CHECK_NULL);

   init_obj(obj, size);

   return obj;

 }

 // Need to investigate, do we really want to throw OOM exception here?

 HeapWord* CollectedHeap::common_permanent_mem_allocate_noinit(size_t size, TRAPS) {

   if (HAS_PENDING_EXCEPTION) {

     NOT_PRODUCT(guarantee(false, "Should not allocate with exception pending"));

     return NULL;  // caller does a CHECK_NULL too

   }

 #ifdef ASSERT

   if (CIFireOOMAt > 0 && THREAD->is_Compiler_thread() &&

       ++_fire_out_of_memory_count >= CIFireOOMAt) {

     // For testing of OOM handling in the CI throw an OOM and see how

     // it does.  Historically improper handling of these has resulted

     // in crashes which we really don't want to have in the CI.

     THROW_OOP_0(Universe::out_of_memory_error_perm_gen());

   }

 #endif

   HeapWord* result = Universe::heap()->permanent_mem_allocate(size);

   if (result != NULL) {

     NOT_PRODUCT(Universe::heap()->

       check_for_non_bad_heap_word_value(result, size));

     assert(!HAS_PENDING_EXCEPTION,

            "Unexpected exception, will result in uninitialized storage");

     return result;

   }

   // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support

   report_java_out_of_memory("PermGen space");

   if (JvmtiExport::should_post_resource_exhausted()) {

     JvmtiExport::post_resource_exhausted(

         JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR,

         "PermGen space");

   }

   THROW_OOP_0(Universe::out_of_memory_error_perm_gen());

 }

 HeapWord* CollectedHeap::common_permanent_mem_allocate_init(size_t size, TRAPS) {

   HeapWord* obj = common_permanent_mem_allocate_noinit(size, CHECK_NULL);

   init_obj(obj, size);

   return obj;

 }

 HeapWord* CollectedHeap::allocate_from_tlab(Thread* thread, size_t size) {

   assert(UseTLAB, "should use UseTLAB");

   HeapWord* obj = thread->tlab().allocate(size);

   if (obj != NULL) {

     return obj;

   }

   // Otherwise...

   return allocate_from_tlab_slow(thread, size);

 }

 void CollectedHeap::init_obj(HeapWord* obj, size_t size) {

   assert(obj != NULL, "cannot initialize NULL object");

   const size_t hs = oopDesc::header_size();

   assert(size >= hs, "unexpected object size");

   ((oop)obj)->set_klass_gap(0);

   Copy::fill_to_aligned_words(obj + hs, size - hs);

 }

 oop CollectedHeap::obj_allocate(KlassHandle klass, int size, TRAPS) {

   debug_only(check_for_valid_allocation_state());

   assert(!Universe::heap()->is_gc_active(), "Allocation during gc not allowed");

   assert(size >= 0, "int won't convert to size_t");

   HeapWord* obj = common_mem_allocate_init(size, false, CHECK_NULL);

   post_allocation_setup_obj(klass, obj, size);

   NOT_PRODUCT(Universe::heap()->check_for_bad_heap_word_value(obj, size));

   return (oop)obj;

 }

 oop CollectedHeap::array_allocate(KlassHandle klass,

                                   int size,

                                   int length,

                                   TRAPS) {

   debug_only(check_for_valid_allocation_state());

   assert(!Universe::heap()->is_gc_active(), "Allocation during gc not allowed");

   assert(size >= 0, "int won't convert to size_t");

   HeapWord* obj = common_mem_allocate_init(size, false, CHECK_NULL);

   post_allocation_setup_array(klass, obj, size, length);

   NOT_PRODUCT(Universe::heap()->check_for_bad_heap_word_value(obj, size));

   return (oop)obj;

 }

 oop CollectedHeap::large_typearray_allocate(KlassHandle klass,

                                             int size,

                                             int length,

                                             TRAPS) {

   debug_only(check_for_valid_allocation_state());

   assert(!Universe::heap()->is_gc_active(), "Allocation during gc not allowed");

   assert(size >= 0, "int won't convert to size_t");

   HeapWord* obj = common_mem_allocate_init(size, true, CHECK_NULL);

   post_allocation_setup_array(klass, obj, size, length);

   NOT_PRODUCT(Universe::heap()->check_for_bad_heap_word_value(obj, size));

   return (oop)obj;

 }

 oop CollectedHeap::permanent_obj_allocate(KlassHandle klass, int size, TRAPS) {

   oop obj = permanent_obj_allocate_no_klass_install(klass, size, CHECK_NULL);

   post_allocation_install_obj_klass(klass, obj, size);

   NOT_PRODUCT(Universe::heap()->check_for_bad_heap_word_value((HeapWord*) obj,

                                                               size));

   return obj;

 }

 oop CollectedHeap::permanent_obj_allocate_no_klass_install(KlassHandle klass,

                                                            int size,

                                                            TRAPS) {

   debug_only(check_for_valid_allocation_state());

   assert(!Universe::heap()->is_gc_active(), "Allocation during gc not allowed");

   assert(size >= 0, "int won't convert to size_t");

   HeapWord* obj = common_permanent_mem_allocate_init(size, CHECK_NULL);

   post_allocation_setup_no_klass_install(klass, obj, size);

   NOT_PRODUCT(Universe::heap()->check_for_bad_heap_word_value(obj, size));

   return (oop)obj;

 }

 oop CollectedHeap::permanent_array_allocate(KlassHandle klass,

                                             int size,

                                             int length,

                                             TRAPS) {

   debug_only(check_for_valid_allocation_state());

   assert(!Universe::heap()->is_gc_active(), "Allocation during gc not allowed");

   assert(size >= 0, "int won't convert to size_t");

   HeapWord* obj = common_permanent_mem_allocate_init(size, CHECK_NULL);

   post_allocation_setup_array(klass, obj, size, length);

   NOT_PRODUCT(Universe::heap()->check_for_bad_heap_word_value(obj, size));

   return (oop)obj;

 }

 // Returns "TRUE" if "p" is a method oop in the

 // current heap with high probability. NOTE: The main

 // current consumers of this interface are Forte::

 // and ThreadProfiler::. In these cases, the

 // interpreter frame from which "p" came, may be

 // under construction when sampled asynchronously, so

 // the clients want to check that it represents a

 // valid method before using it. Nonetheless since

 // the clients do not typically lock out GC, the

 // predicate is_valid_method() is not stable, so

 // it is possible that by the time "p" is used, it

 // is no longer valid.

 inline bool CollectedHeap::is_valid_method(oop p) const {

   return

     p != NULL &&

     // Check whether it is aligned at a HeapWord boundary.

     Space::is_aligned(p) &&

     // Check whether "method" is in the allocated part of the

     // permanent generation -- this needs to be checked before

     // p->klass() below to avoid a SEGV (but see below

     // for a potential window of vulnerability).

     is_permanent((void*)p) &&

     // See if GC is active; however, there is still an

     // apparently unavoidable window after this call

     // and before the client of this interface uses "p".

     // If the client chooses not to lock out GC, then

     // it's a risk the client must accept.

     !is_gc_active() &&

     // Check that p is a methodOop.

     p->klass() == Universe::methodKlassObj();

 }

 #ifndef PRODUCT

 inline bool

 CollectedHeap::promotion_should_fail(volatile size_t* count) {

   // Access to count is not atomic; the value does not have to be exact.

   if (PromotionFailureALot) {

     const size_t gc_num = total_collections();

     const size_t elapsed_gcs = gc_num - _promotion_failure_alot_gc_number;

     if (elapsed_gcs >= PromotionFailureALotInterval) {

       // Test for unsigned arithmetic wrap-around.

       if (++*count >= PromotionFailureALotCount) {

         *count = 0;

         return true;

       }

     }

   }

   return false;

 }

 inline bool CollectedHeap::promotion_should_fail() {

   return promotion_should_fail(&_promotion_failure_alot_count);

 }

 inline void CollectedHeap::reset_promotion_should_fail(volatile size_t* count) {

   if (PromotionFailureALot) {

     _promotion_failure_alot_gc_number = total_collections();

     *count = 0;

   }

 }

 inline void CollectedHeap::reset_promotion_should_fail() {

   reset_promotion_should_fail(&_promotion_failure_alot_count);

 }

 #endif  // #ifndef PRODUCT