author | stefank |
Wed, 06 Aug 2014 09:55:16 +0200 | |
changeset 25908 | 8adb2fb6fc3c |
parent 24424 | 2658d7834c6e |
child 26157 | 70eddb655686 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2001, 2014, 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/g1/heapRegion.hpp" |
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#include "gc_implementation/g1/heapRegionSeq.inline.hpp" |
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#include "gc_implementation/g1/heapRegionSet.hpp" |
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#include "gc_implementation/g1/g1CollectedHeap.inline.hpp" |
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#include "memory/allocation.hpp" |
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// Private |
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uint HeapRegionSeq::find_contiguous_from(uint from, uint num) { |
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uint len = length(); |
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assert(num > 1, "use this only for sequences of length 2 or greater"); |
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assert(from <= len, |
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err_msg("from: %u should be valid and <= than %u", from, len)); |
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uint curr = from; |
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uint first = G1_NULL_HRS_INDEX; |
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uint num_so_far = 0; |
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while (curr < len && num_so_far < num) { |
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if (at(curr)->is_empty()) { |
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if (first == G1_NULL_HRS_INDEX) { |
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first = curr; |
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num_so_far = 1; |
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} else { |
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num_so_far += 1; |
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} |
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} else { |
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first = G1_NULL_HRS_INDEX; |
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num_so_far = 0; |
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} |
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curr += 1; |
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} |
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assert(num_so_far <= num, "post-condition"); |
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if (num_so_far == num) { |
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// we found enough space for the humongous object |
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assert(from <= first && first < len, "post-condition"); |
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assert(first < curr && (curr - first) == num, "post-condition"); |
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for (uint i = first; i < first + num; ++i) { |
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assert(at(i)->is_empty(), "post-condition"); |
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} |
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return first; |
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} else { |
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// we failed to find enough space for the humongous object |
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return G1_NULL_HRS_INDEX; |
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} |
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} |
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// Public |
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void HeapRegionSeq::initialize(HeapWord* bottom, HeapWord* end) { |
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assert((uintptr_t) bottom % HeapRegion::GrainBytes == 0, |
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"bottom should be heap region aligned"); |
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assert((uintptr_t) end % HeapRegion::GrainBytes == 0, |
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"end should be heap region aligned"); |
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_next_search_index = 0; |
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_allocated_length = 0; |
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_regions.initialize(bottom, end, HeapRegion::GrainBytes); |
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} |
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MemRegion HeapRegionSeq::expand_by(HeapWord* old_end, |
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HeapWord* new_end, |
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FreeRegionList* list) { |
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assert(old_end < new_end, "don't call it otherwise"); |
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G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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HeapWord* next_bottom = old_end; |
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assert(heap_bottom() <= next_bottom, "invariant"); |
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while (next_bottom < new_end) { |
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assert(next_bottom < heap_end(), "invariant"); |
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uint index = length(); |
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assert(index < max_length(), "otherwise we cannot expand further"); |
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if (index == 0) { |
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// We have not allocated any regions so far |
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assert(next_bottom == heap_bottom(), "invariant"); |
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} else { |
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// next_bottom should match the end of the last/previous region |
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assert(next_bottom == at(index - 1)->end(), "invariant"); |
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} |
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if (index == _allocated_length) { |
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// We have to allocate a new HeapRegion. |
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HeapRegion* new_hr = g1h->new_heap_region(index, next_bottom); |
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if (new_hr == NULL) { |
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// allocation failed, we bail out and return what we have done so far |
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return MemRegion(old_end, next_bottom); |
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} |
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assert(_regions.get_by_index(index) == NULL, "invariant"); |
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_regions.set_by_index(index, new_hr); |
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increment_allocated_length(); |
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} |
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// Have to increment the length first, otherwise we will get an |
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// assert failure at(index) below. |
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increment_length(); |
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HeapRegion* hr = at(index); |
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list->add_as_tail(hr); |
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next_bottom = hr->end(); |
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} |
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assert(next_bottom == new_end, "post-condition"); |
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return MemRegion(old_end, next_bottom); |
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} |
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uint HeapRegionSeq::free_suffix() { |
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uint res = 0; |
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uint index = length(); |
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while (index > 0) { |
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index -= 1; |
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if (!at(index)->is_empty()) { |
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break; |
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} |
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res += 1; |
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} |
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return res; |
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} |
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uint HeapRegionSeq::find_contiguous(uint num) { |
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assert(num > 1, "use this only for sequences of length 2 or greater"); |
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assert(_next_search_index <= length(), |
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err_msg("_next_search_index: %u should be valid and <= than %u", |
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_next_search_index, length())); |
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uint start = _next_search_index; |
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uint res = find_contiguous_from(start, num); |
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if (res == G1_NULL_HRS_INDEX && start > 0) { |
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// Try starting from the beginning. If _next_search_index was 0, |
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// no point in doing this again. |
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res = find_contiguous_from(0, num); |
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} |
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if (res != G1_NULL_HRS_INDEX) { |
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assert(res < length(), err_msg("res: %u should be valid", res)); |
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_next_search_index = res + num; |
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assert(_next_search_index <= length(), |
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err_msg("_next_search_index: %u should be valid and <= than %u", |
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_next_search_index, length())); |
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} |
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return res; |
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} |
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void HeapRegionSeq::iterate(HeapRegionClosure* blk) const { |
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iterate_from((HeapRegion*) NULL, blk); |
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} |
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void HeapRegionSeq::iterate_from(HeapRegion* hr, HeapRegionClosure* blk) const { |
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uint hr_index = 0; |
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if (hr != NULL) { |
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hr_index = hr->hrs_index(); |
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} |
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uint len = length(); |
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for (uint i = hr_index; i < len; i += 1) { |
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bool res = blk->doHeapRegion(at(i)); |
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if (res) { |
180 |
blk->incomplete(); |
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return; |
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182 |
} |
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} |
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for (uint i = 0; i < hr_index; i += 1) { |
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bool res = blk->doHeapRegion(at(i)); |
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if (res) { |
187 |
blk->incomplete(); |
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188 |
return; |
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189 |
} |
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190 |
} |
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191 |
} |
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192 |
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uint HeapRegionSeq::shrink_by(uint num_regions_to_remove) { |
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// Reset this in case it's currently pointing into the regions that |
195 |
// we just removed. |
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_next_search_index = 0; |
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|
9989 | 198 |
assert(length() > 0, "the region sequence should not be empty"); |
199 |
assert(length() <= _allocated_length, "invariant"); |
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200 |
assert(_allocated_length > 0, "we should have at least one region committed"); |
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assert(num_regions_to_remove < length(), "We should never remove all regions"); |
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uint i = 0; |
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for (; i < num_regions_to_remove; i++) { |
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HeapRegion* cur = at(length() - 1); |
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if (!cur->is_empty()) { |
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// We have to give up if the region can not be moved |
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break; |
1374 | 210 |
} |
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assert(!cur->isHumongous(), "Humongous regions should not be empty"); |
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decrement_length(); |
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} |
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215 |
return i; |
1374 | 216 |
} |
217 |
||
9989 | 218 |
#ifndef PRODUCT |
219 |
void HeapRegionSeq::verify_optional() { |
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guarantee(length() <= _allocated_length, |
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err_msg("invariant: _length: %u _allocated_length: %u", |
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length(), _allocated_length)); |
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guarantee(_allocated_length <= max_length(), |
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err_msg("invariant: _allocated_length: %u _max_length: %u", |
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_allocated_length, max_length())); |
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guarantee(_next_search_index <= length(), |
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err_msg("invariant: _next_search_index: %u _length: %u", |
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_next_search_index, length())); |
9989 | 229 |
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HeapWord* prev_end = heap_bottom(); |
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for (uint i = 0; i < _allocated_length; i += 1) { |
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HeapRegion* hr = _regions.get_by_index(i); |
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guarantee(hr != NULL, err_msg("invariant: i: %u", i)); |
9989 | 234 |
guarantee(hr->bottom() == prev_end, |
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err_msg("invariant i: %u "HR_FORMAT" prev_end: "PTR_FORMAT, |
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i, HR_FORMAT_PARAMS(hr), p2i(prev_end))); |
9989 | 237 |
guarantee(hr->hrs_index() == i, |
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err_msg("invariant: i: %u hrs_index(): %u", i, hr->hrs_index())); |
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if (i < length()) { |
9989 | 240 |
// Asserts will fire if i is >= _length |
241 |
HeapWord* addr = hr->bottom(); |
|
242 |
guarantee(addr_to_region(addr) == hr, "sanity"); |
|
243 |
} else { |
|
244 |
guarantee(hr->is_empty(), "sanity"); |
|
245 |
guarantee(!hr->isHumongous(), "sanity"); |
|
246 |
// using assert instead of guarantee here since containing_set() |
|
247 |
// is only available in non-product builds. |
|
248 |
assert(hr->containing_set() == NULL, "sanity"); |
|
249 |
} |
|
250 |
if (hr->startsHumongous()) { |
|
251 |
prev_end = hr->orig_end(); |
|
252 |
} else { |
|
253 |
prev_end = hr->end(); |
|
254 |
} |
|
1374 | 255 |
} |
20083
df032615dd00
7163191: G1: introduce a "heap spanning table" abstraction
tschatzl
parents:
17323
diff
changeset
|
256 |
for (uint i = _allocated_length; i < max_length(); i += 1) { |
df032615dd00
7163191: G1: introduce a "heap spanning table" abstraction
tschatzl
parents:
17323
diff
changeset
|
257 |
guarantee(_regions.get_by_index(i) == NULL, err_msg("invariant i: %u", i)); |
9989 | 258 |
} |
1374 | 259 |
} |
9989 | 260 |
#endif // PRODUCT |