jdk8-mips64-public/hotspot: src/share/vm/gc_interface/collectedHeap.inline.hpp@a92cdbac8b9e (annotated)

src/share/vm/gc_interface/collectedHeap.inline.hpp@a92cdbac8b9e (annotated)

src/share/vm/gc_interface/collectedHeap.inline.hpp

Mon, 26 Sep 2011 10:24:05 -0700

author: kvn
date: Mon, 26 Sep 2011 10:24:05 -0700
changeset 3157: a92cdbac8b9e
parent 3156: f08d439fab8c
child 3675: 9a9bb0010c91
permissions: -rw-r--r--

7081933: Use zeroing elimination optimization for large array
Summary: Don't zero new typeArray during runtime call if the allocation is followed by arraycopy into it.
Reviewed-by: twisti

 /*
  * Copyright (c) 2001, 2011, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #ifndef SHARE_VM_GC_INTERFACE_COLLECTEDHEAP_INLINE_HPP
 #define SHARE_VM_GC_INTERFACE_COLLECTEDHEAP_INLINE_HPP
 #include "gc_interface/collectedHeap.hpp"
 #include "memory/threadLocalAllocBuffer.inline.hpp"
 #include "memory/universe.hpp"
 #include "oops/arrayOop.hpp"
 #include "prims/jvmtiExport.hpp"
 #include "runtime/sharedRuntime.hpp"
 #include "runtime/thread.hpp"
 #include "services/lowMemoryDetector.hpp"
 #include "utilities/copy.hpp"
 #ifdef TARGET_OS_FAMILY_linux
 # include "thread_linux.inline.hpp"
 #endif
 #ifdef TARGET_OS_FAMILY_solaris
 # include "thread_solaris.inline.hpp"
 #endif
 #ifdef TARGET_OS_FAMILY_windows
 # include "thread_windows.inline.hpp"
 #endif
 #ifdef TARGET_OS_FAMILY_bsd
 # include "thread_bsd.inline.hpp"
 #endif
 // 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, 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
   }
   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,
                                           &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");
     THREAD->incr_allocated_bytes(size * HeapWordSize);
     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, TRAPS) {
   HeapWord* obj = common_mem_allocate_noinit(size, 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, 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, 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::array_allocate_nozero(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_noinit(size, CHECK_NULL);
   ((oop)obj)->set_klass_gap(0);
   post_allocation_setup_array(klass, obj, size, length);
 #ifndef PRODUCT
   const size_t hs = oopDesc::header_size()+1;
   Universe::heap()->check_for_non_bad_heap_word_value(obj+hs, size-hs);
 #endif
   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);
 #ifndef PRODUCT
   const size_t hs = oopDesc::header_size();
   Universe::heap()->check_for_bad_heap_word_value(obj+hs, size-hs);
 #endif
   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
 #endif // SHARE_VM_GC_INTERFACE_COLLECTEDHEAP_INLINE_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/gc_interface/collectedHeap.inline.hpp@a92cdbac8b9e (annotated)

src/share/vm/gc_interface/collectedHeap.inline.hpp