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Java example source code file (collectedHeap.inline.hpp)

This example Java source code file (collectedHeap.inline.hpp) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

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Java - Java tags/keywords

allocation, check_null, collectedheap\:\:promotion_should_fail, collectedheap\:\:reset_promotion_should_fail, has_pending_exception, heapword, java, not_product, null, share_vm_gc_interface_collectedheap_inline_hpp, throw_oop_0, traps, universe::heap, universe\:\:is_fully_initialized

The collectedHeap.inline.hpp Java example source code

/*
 * Copyright (c) 2001, 2013, 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/allocTracer.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.inline.hpp"
#include "services/lowMemoryDetector.hpp"
#include "utilities/copy.hpp"

// Inline allocation implementations.

void CollectedHeap::post_allocation_setup_common(KlassHandle klass,
                                                 HeapWord* obj) {
  post_allocation_setup_no_klass_install(klass, obj);
  post_allocation_install_obj_klass(klass, oop(obj));
}

void CollectedHeap::post_allocation_setup_no_klass_install(KlassHandle klass,
                                                           HeapWord* objPtr) {
  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) {
  // 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(obj != NULL, "NULL object pointer");
  obj->set_klass(klass());
  assert(!Universe::is_fully_initialized() || obj->klass() != NULL,
         "missing klass");
}

// 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()->name() != NULL) {
      SharedRuntime::dtrace_object_alloc(obj);
    }
  }
}

void CollectedHeap::post_allocation_setup_obj(KlassHandle klass,
                                              HeapWord* obj) {
  post_allocation_setup_common(klass, obj);
  assert(Universe::is_bootstrapping() ||
         !((oop)obj)->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,
                                                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);
  assert(((oop)obj)->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(KlassHandle klass, 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 = allocate_from_tlab(klass, 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);

    AllocTracer::send_allocation_outside_tlab_event(klass, 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(KlassHandle klass, size_t size, TRAPS) {
  HeapWord* obj = common_mem_allocate_noinit(klass, size, CHECK_NULL);
  init_obj(obj, size);
  return obj;
}

HeapWord* CollectedHeap::allocate_from_tlab(KlassHandle klass, 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(klass, 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(klass, size, CHECK_NULL);
  post_allocation_setup_obj(klass, obj);
  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(klass, size, CHECK_NULL);
  post_allocation_setup_array(klass, obj, 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(klass, size, CHECK_NULL);
  ((oop)obj)->set_klass_gap(0);
  post_allocation_setup_array(klass, obj, 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;
}

inline void CollectedHeap::oop_iterate_no_header(OopClosure* cl) {
  NoHeaderExtendedOopClosure no_header_cl(cl);
  oop_iterate(&no_header_cl);
}

#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

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