author | stefank |
Thu, 01 Sep 2011 16:18:17 +0200 | |
changeset 10524 | 6594ca81279a |
parent 7397 | 5b173b4ca846 |
child 10676 | 1e1510b8031a |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#include "precompiled.hpp" |
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#include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" |
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#include "gc_implementation/parallelScavenge/psPromotionLAB.hpp" |
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#include "gc_implementation/shared/mutableSpace.hpp" |
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#include "oops/oop.inline.hpp" |
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size_t PSPromotionLAB::filler_header_size; |
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// This is the shared initialization code. It sets up the basic pointers, |
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// and allows enough extra space for a filler object. We call a virtual |
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// method, "lab_is_valid()" to handle the different asserts the old/young |
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// labs require. |
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void PSPromotionLAB::initialize(MemRegion lab) { |
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assert(lab_is_valid(lab), "Sanity"); |
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HeapWord* bottom = lab.start(); |
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HeapWord* end = lab.end(); |
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set_bottom(bottom); |
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set_end(end); |
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set_top(bottom); |
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// Initialize after VM starts up because header_size depends on compressed |
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// oops. |
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filler_header_size = align_object_size(typeArrayOopDesc::header_size(T_INT)); |
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// We can be initialized to a zero size! |
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if (free() > 0) { |
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if (ZapUnusedHeapArea) { |
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debug_only(Copy::fill_to_words(top(), free()/HeapWordSize, badHeapWord)); |
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} |
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// NOTE! We need to allow space for a filler object. |
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assert(lab.word_size() >= filler_header_size, "lab is too small"); |
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end = end - filler_header_size; |
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set_end(end); |
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_state = needs_flush; |
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} else { |
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_state = zero_size; |
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} |
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assert(this->top() <= this->end(), "pointers out of order"); |
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} |
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// Fill all remaining lab space with an unreachable object. |
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// The goal is to leave a contiguous parseable span of objects. |
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void PSPromotionLAB::flush() { |
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assert(_state != flushed, "Attempt to flush PLAB twice"); |
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assert(top() <= end(), "pointers out of order"); |
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// If we were initialized to a zero sized lab, there is |
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// nothing to flush |
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if (_state == zero_size) |
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return; |
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// PLAB's never allocate the last aligned_header_size |
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// so they can always fill with an array. |
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HeapWord* tlab_end = end() + filler_header_size; |
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typeArrayOop filler_oop = (typeArrayOop) top(); |
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filler_oop->set_mark(markOopDesc::prototype()); |
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filler_oop->set_klass(Universe::intArrayKlassObj()); |
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const size_t array_length = |
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pointer_delta(tlab_end, top()) - typeArrayOopDesc::header_size(T_INT); |
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assert( (array_length * (HeapWordSize/sizeof(jint))) < (size_t)max_jint, "array too big in PSPromotionLAB"); |
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filler_oop->set_length((int)(array_length * (HeapWordSize/sizeof(jint)))); |
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#ifdef ASSERT |
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// Note that we actually DO NOT want to use the aligned header size! |
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HeapWord* elt_words = ((HeapWord*)filler_oop) + typeArrayOopDesc::header_size(T_INT); |
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Copy::fill_to_words(elt_words, array_length, 0xDEAABABE); |
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#endif |
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set_bottom(NULL); |
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set_end(NULL); |
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set_top(NULL); |
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_state = flushed; |
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} |
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bool PSPromotionLAB::unallocate_object(oop obj) { |
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assert(Universe::heap()->is_in(obj), "Object outside heap"); |
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if (contains(obj)) { |
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HeapWord* object_end = (HeapWord*)obj + obj->size(); |
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assert(object_end <= top(), "Object crosses promotion LAB boundary"); |
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if (object_end == top()) { |
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set_top((HeapWord*)obj); |
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return true; |
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} |
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} |
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return false; |
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} |
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// Fill all remaining lab space with an unreachable object. |
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// The goal is to leave a contiguous parseable span of objects. |
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void PSOldPromotionLAB::flush() { |
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assert(_state != flushed, "Attempt to flush PLAB twice"); |
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assert(top() <= end(), "pointers out of order"); |
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if (_state == zero_size) |
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return; |
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HeapWord* obj = top(); |
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PSPromotionLAB::flush(); |
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assert(_start_array != NULL, "Sanity"); |
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_start_array->allocate_block(obj); |
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} |
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#ifdef ASSERT |
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bool PSYoungPromotionLAB::lab_is_valid(MemRegion lab) { |
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ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); |
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assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); |
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MutableSpace* to_space = heap->young_gen()->to_space(); |
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MemRegion used = to_space->used_region(); |
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if (used.contains(lab)) { |
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return true; |
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} |
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return false; |
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} |
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bool PSOldPromotionLAB::lab_is_valid(MemRegion lab) { |
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ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); |
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assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); |
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assert(_start_array->covered_region().contains(lab), "Sanity"); |
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PSOldGen* old_gen = heap->old_gen(); |
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MemRegion used = old_gen->object_space()->used_region(); |
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if (used.contains(lab)) { |
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return true; |
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} |
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return false; |
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} |
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#endif /* ASSERT */ |