author | drchase |
Fri, 09 May 2014 16:50:54 -0400 | |
changeset 24424 | 2658d7834c6e |
parent 24092 | e274d864545a |
child 29800 | fa5f7a2bf717 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2002, 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/shared/spaceDecorator.hpp" |
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#include "memory/space.inline.hpp" |
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#include "utilities/copy.hpp" |
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PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
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// Catch-all file for utility classes |
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#ifndef PRODUCT |
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// Returns true is the location q matches the mangling |
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// pattern. |
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bool SpaceMangler::is_mangled(HeapWord* q) { |
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// This test loses precision but is good enough |
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return badHeapWord == (max_juint & (uintptr_t) q->value()); |
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} |
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void SpaceMangler::set_top_for_allocations(HeapWord* v) { |
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if (v < end()) { |
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assert(!CheckZapUnusedHeapArea || is_mangled(v), |
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"The high water mark is not mangled"); |
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} |
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_top_for_allocations = v; |
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} |
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// Mangle only the unused space that has not previously |
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// been mangled and that has not been allocated since being |
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// mangled. |
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void SpaceMangler::mangle_unused_area() { |
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assert(ZapUnusedHeapArea, "Mangling should not be in use"); |
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// Mangle between top and the high water mark. Safeguard |
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// against the space changing since top_for_allocations was |
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// set. |
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HeapWord* mangled_end = MIN2(top_for_allocations(), end()); |
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if (top() < mangled_end) { |
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MemRegion mangle_mr(top(), mangled_end); |
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SpaceMangler::mangle_region(mangle_mr); |
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// Light weight check of mangling. |
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check_mangled_unused_area(end()); |
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} |
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// Complete check of unused area which is functional when |
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// DEBUG_MANGLING is defined. |
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check_mangled_unused_area_complete(); |
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} |
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// A complete mangle is expected in the |
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// exceptional case where top_for_allocations is not |
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// properly tracking the high water mark for mangling. |
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// This can be the case when to-space is being used for |
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// scratch space during a mark-sweep-compact. See |
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// contribute_scratch() and PSMarkSweep::allocate_stacks(). |
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void SpaceMangler::mangle_unused_area_complete() { |
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assert(ZapUnusedHeapArea, "Mangling should not be in use"); |
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MemRegion mangle_mr(top(), end()); |
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SpaceMangler::mangle_region(mangle_mr); |
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} |
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// Simply mangle the MemRegion mr. |
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void SpaceMangler::mangle_region(MemRegion mr) { |
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assert(ZapUnusedHeapArea, "Mangling should not be in use"); |
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#ifdef ASSERT |
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if(TraceZapUnusedHeapArea) { |
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gclog_or_tty->print("Mangling [" PTR_FORMAT " to " PTR_FORMAT ")", mr.start(), mr.end()); |
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} |
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Copy::fill_to_words(mr.start(), mr.word_size(), badHeapWord); |
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if(TraceZapUnusedHeapArea) { |
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gclog_or_tty->print_cr(" done"); |
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} |
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#endif |
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} |
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// Check that top, top_for_allocations and the last |
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// word of the space are mangled. In a tight memory |
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// situation even this light weight mangling could |
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// cause paging by touching the end of the space. |
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void SpaceMangler::check_mangled_unused_area(HeapWord* limit) { |
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if (CheckZapUnusedHeapArea) { |
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// This method can be called while the spaces are |
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// being reshaped so skip the test if the end of the |
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// space is beyond the specified limit; |
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if (end() > limit) return; |
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|
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assert(top() == end() || |
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(is_mangled(top())), "Top not mangled"); |
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assert((top_for_allocations() < top()) || |
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(top_for_allocations() >= end()) || |
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(is_mangled(top_for_allocations())), |
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"Older unused not mangled"); |
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assert(top() == end() || |
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(is_mangled(end() - 1)), "End not properly mangled"); |
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// Only does checking when DEBUG_MANGLING is defined. |
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check_mangled_unused_area_complete(); |
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} |
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} |
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|
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#undef DEBUG_MANGLING |
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// This should only be used while debugging the mangling |
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// because of the high cost of checking the completeness. |
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void SpaceMangler::check_mangled_unused_area_complete() { |
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if (CheckZapUnusedHeapArea) { |
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assert(ZapUnusedHeapArea, "Not mangling unused area"); |
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#ifdef DEBUG_MANGLING |
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HeapWord* q = top(); |
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HeapWord* limit = end(); |
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|
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bool passed = true; |
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while (q < limit) { |
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if (!is_mangled(q)) { |
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passed = false; |
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break; |
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} |
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q++; |
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} |
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assert(passed, "Mangling is not complete"); |
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#endif |
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} |
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} |
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#undef DEBUG_MANGLING |
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#endif // not PRODUCT |