duke@435: /*
duke@435:  * Copyright 2001-2006 Sun Microsystems, Inc.  All Rights Reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
duke@435:  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435:  * CA 95054 USA or visit www.sun.com if you need additional information or
duke@435:  * have any questions.
duke@435:  *
duke@435:  */
duke@435: 
duke@435: CompactibleSpace* DefNewGeneration::first_compaction_space() const {
duke@435:   return eden();
duke@435: }
duke@435: 
duke@435: HeapWord* DefNewGeneration::allocate(size_t word_size,
duke@435:                                      bool is_tlab) {
duke@435:   // This is the slow-path allocation for the DefNewGeneration.
duke@435:   // Most allocations are fast-path in compiled code.
duke@435:   // We try to allocate from the eden.  If that works, we are happy.
duke@435:   // Note that since DefNewGeneration supports lock-free allocation, we
duke@435:   // have to use it here, as well.
duke@435:   HeapWord* result = eden()->par_allocate(word_size);
duke@435:   if (result != NULL) {
duke@435:     return result;
duke@435:   }
duke@435:   do {
duke@435:     HeapWord* old_limit = eden()->soft_end();
duke@435:     if (old_limit < eden()->end()) {
duke@435:       // Tell the next generation we reached a limit.
duke@435:       HeapWord* new_limit =
duke@435:         next_gen()->allocation_limit_reached(eden(), eden()->top(), word_size);
duke@435:       if (new_limit != NULL) {
duke@435:         Atomic::cmpxchg_ptr(new_limit, eden()->soft_end_addr(), old_limit);
duke@435:       } else {
duke@435:         assert(eden()->soft_end() == eden()->end(),
duke@435:                "invalid state after allocation_limit_reached returned null");
duke@435:       }
duke@435:     } else {
duke@435:       // The allocation failed and the soft limit is equal to the hard limit,
duke@435:       // there are no reasons to do an attempt to allocate
duke@435:       assert(old_limit == eden()->end(), "sanity check");
duke@435:       break;
duke@435:     }
duke@435:     // Try to allocate until succeeded or the soft limit can't be adjusted
duke@435:     result = eden()->par_allocate(word_size);
duke@435:   } while (result == NULL);
duke@435: 
duke@435:   // If the eden is full and the last collection bailed out, we are running
duke@435:   // out of heap space, and we try to allocate the from-space, too.
duke@435:   // allocate_from_space can't be inlined because that would introduce a
duke@435:   // circular dependency at compile time.
duke@435:   if (result == NULL) {
duke@435:     result = allocate_from_space(word_size);
duke@435:   }
duke@435:   return result;
duke@435: }
duke@435: 
duke@435: HeapWord* DefNewGeneration::par_allocate(size_t word_size,
duke@435:                                          bool is_tlab) {
duke@435:   return eden()->par_allocate(word_size);
duke@435: }
duke@435: 
duke@435: void DefNewGeneration::gc_prologue(bool full) {
duke@435:   // Ensure that _end and _soft_end are the same in eden space.
duke@435:   eden()->set_soft_end(eden()->end());
duke@435: }
duke@435: 
duke@435: size_t DefNewGeneration::tlab_capacity() const {
duke@435:   return eden()->capacity();
duke@435: }
duke@435: 
duke@435: size_t DefNewGeneration::unsafe_max_tlab_alloc() const {
duke@435:   return unsafe_max_alloc_nogc();
duke@435: }