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

 /*

  * Copyright (c) 1997, 2012, 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.

  *

  */

 #include "precompiled.hpp"

 #include "memory/allocation.inline.hpp"

 #include "oops/constantPool.hpp"

 #include "oops/oop.inline.hpp"

 #include "runtime/handles.inline.hpp"

 #include "runtime/thread.inline.hpp"

 #ifdef TARGET_OS_FAMILY_linux

 # include "os_linux.inline.hpp"

 #endif

 #ifdef TARGET_OS_FAMILY_solaris

 # include "os_solaris.inline.hpp"

 #endif

 #ifdef TARGET_OS_FAMILY_windows

 # include "os_windows.inline.hpp"

 #endif

 #ifdef TARGET_OS_FAMILY_bsd

 # include "os_bsd.inline.hpp"

 #endif

 #ifdef ASSERT

 oop* HandleArea::allocate_handle(oop obj) {

   assert(_handle_mark_nesting > 1, "memory leak: allocating handle outside HandleMark");

   assert(_no_handle_mark_nesting == 0, "allocating handle inside NoHandleMark");

   assert(obj->is_oop(), "sanity check");

   return real_allocate_handle(obj);

 }

 Handle::Handle(Thread* thread, oop obj) {

   assert(thread == Thread::current(), "sanity check");

   if (obj == NULL) {

     _handle = NULL;

   } else {

     _handle = thread->handle_area()->allocate_handle(obj);

   }

 }

 #endif

 static uintx chunk_oops_do(OopClosure* f, Chunk* chunk, char* chunk_top) {

   oop* bottom = (oop*) chunk->bottom();

   oop* top    = (oop*) chunk_top;

   uintx handles_visited = top - bottom;

   assert(top >= bottom && top <= (oop*) chunk->top(), "just checking");

   // during GC phase 3, a handle may be a forward pointer that

   // is not yet valid, so loosen the assertion

   while (bottom < top) {

     // This test can be moved up but for now check every oop.

     assert((*bottom)->is_oop(), "handle should point to oop");

     f->do_oop(bottom++);

   }

   return handles_visited;

 }

 // Used for debugging handle allocation.

 NOT_PRODUCT(jint _nof_handlemarks  = 0;)

 void HandleArea::oops_do(OopClosure* f) {

   uintx handles_visited = 0;

   // First handle the current chunk. It is filled to the high water mark.

   handles_visited += chunk_oops_do(f, _chunk, _hwm);

   // Then handle all previous chunks. They are completely filled.

   Chunk* k = _first;

   while(k != _chunk) {

     handles_visited += chunk_oops_do(f, k, k->top());

     k = k->next();

   }

   // The thread local handle areas should not get very large

   if (TraceHandleAllocation && handles_visited > TotalHandleAllocationLimit) {

 #ifdef ASSERT

     warning("%d: Visited in HandleMark : %d",

       _nof_handlemarks, handles_visited);

 #else

     warning("Visited in HandleMark : %d", handles_visited);

 #endif

   }

   if (_prev != NULL) _prev->oops_do(f);

 }

 void HandleMark::initialize(Thread* thread) {

   _thread = thread;

   // Save area

   _area  = thread->handle_area();

   // Save current top

   _chunk = _area->_chunk;

   _hwm   = _area->_hwm;

   _max   = _area->_max;

   _size_in_bytes = _area->_size_in_bytes;

   debug_only(_area->_handle_mark_nesting++);

   assert(_area->_handle_mark_nesting > 0, "must stack allocate HandleMarks");

   debug_only(Atomic::inc(&_nof_handlemarks);)

   // Link this in the thread

   set_previous_handle_mark(thread->last_handle_mark());

   thread->set_last_handle_mark(this);

 }

 HandleMark::~HandleMark() {

   HandleArea* area = _area;   // help compilers with poor alias analysis

   assert(area == _thread->handle_area(), "sanity check");

   assert(area->_handle_mark_nesting > 0, "must stack allocate HandleMarks" );

   debug_only(area->_handle_mark_nesting--);

   // Debug code to trace the number of handles allocated per mark/

 #ifdef ASSERT

   if (TraceHandleAllocation) {

     size_t handles = 0;

     Chunk *c = _chunk->next();

     if (c == NULL) {

       handles = area->_hwm - _hwm; // no new chunk allocated

     } else {

       handles = _max - _hwm;      // add rest in first chunk

       while(c != NULL) {

         handles += c->length();

         c = c->next();

       }

       handles -= area->_max - area->_hwm; // adjust for last trunk not full

     }

     handles /= sizeof(void *); // Adjust for size of a handle

     if (handles > HandleAllocationLimit) {

       // Note: _nof_handlemarks is only set in debug mode

       warning("%d: Allocated in HandleMark : %d", _nof_handlemarks, handles);

     }

     tty->print_cr("Handles %d", handles);

   }

 #endif

   // Delete later chunks

   if( _chunk->next() ) {

     // reset arena size before delete chunks. Otherwise, the total

     // arena size could exceed total chunk size

     assert(area->size_in_bytes() > size_in_bytes(), "Sanity check");

     area->set_size_in_bytes(size_in_bytes());

     _chunk->next_chop();

   } else {

     assert(area->size_in_bytes() == size_in_bytes(), "Sanity check");

   }

   // Roll back arena to saved top markers

   area->_chunk = _chunk;

   area->_hwm = _hwm;

   area->_max = _max;

 #ifdef ASSERT

   // clear out first chunk (to detect allocation bugs)

   if (ZapVMHandleArea) {

     memset(_hwm, badHandleValue, _max - _hwm);

   }

   Atomic::dec(&_nof_handlemarks);

 #endif

   // Unlink this from the thread

   _thread->set_last_handle_mark(previous_handle_mark());

 }

 #ifdef ASSERT

 NoHandleMark::NoHandleMark() {

   HandleArea* area = Thread::current()->handle_area();

   area->_no_handle_mark_nesting++;

   assert(area->_no_handle_mark_nesting > 0, "must stack allocate NoHandleMark" );

 }

 NoHandleMark::~NoHandleMark() {

   HandleArea* area = Thread::current()->handle_area();

   assert(area->_no_handle_mark_nesting > 0, "must stack allocate NoHandleMark" );

   area->_no_handle_mark_nesting--;

 }

 ResetNoHandleMark::ResetNoHandleMark() {

   HandleArea* area = Thread::current()->handle_area();

   _no_handle_mark_nesting = area->_no_handle_mark_nesting;

   area->_no_handle_mark_nesting = 0;

 }

 ResetNoHandleMark::~ResetNoHandleMark() {

   HandleArea* area = Thread::current()->handle_area();

   area->_no_handle_mark_nesting = _no_handle_mark_nesting;

 }

 #endif