author | goetz |
Mon, 16 Feb 2015 14:07:36 +0100 | |
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permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2001, 2015, 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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||
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#include "precompiled.hpp" |
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#include "runtime/atomic.inline.hpp" |
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#include "utilities/macros.hpp" |
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#if INCLUDE_ALL_GCS |
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#include "gc_implementation/shared/mutableSpace.hpp" |
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#include "gc_implementation/shared/spaceDecorator.hpp" |
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#include "oops/oop.inline.hpp" |
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#include "runtime/safepoint.hpp" |
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#include "runtime/thread.hpp" |
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#endif // INCLUDE_ALL_GCS |
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PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
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|
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MutableSpace::MutableSpace(size_t alignment): ImmutableSpace(), _top(NULL), _alignment(alignment) { |
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assert(MutableSpace::alignment() % os::vm_page_size() == 0, |
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"Space should be aligned"); |
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_mangler = new MutableSpaceMangler(this); |
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} |
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|
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MutableSpace::~MutableSpace() { |
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delete _mangler; |
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} |
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void MutableSpace::numa_setup_pages(MemRegion mr, bool clear_space) { |
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if (!mr.is_empty()) { |
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size_t page_size = UseLargePages ? alignment() : os::vm_page_size(); |
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HeapWord *start = (HeapWord*)round_to((intptr_t) mr.start(), page_size); |
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HeapWord *end = (HeapWord*)round_down((intptr_t) mr.end(), page_size); |
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if (end > start) { |
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size_t size = pointer_delta(end, start, sizeof(char)); |
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if (clear_space) { |
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// Prefer page reallocation to migration. |
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os::free_memory((char*)start, size, page_size); |
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} |
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os::numa_make_global((char*)start, size); |
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} |
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} |
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} |
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void MutableSpace::pretouch_pages(MemRegion mr) { |
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os::pretouch_memory((char*)mr.start(), (char*)mr.end()); |
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} |
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void MutableSpace::initialize(MemRegion mr, |
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bool clear_space, |
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bool mangle_space, |
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bool setup_pages) { |
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|
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assert(Universe::on_page_boundary(mr.start()) && Universe::on_page_boundary(mr.end()), |
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"invalid space boundaries"); |
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if (setup_pages && (UseNUMA || AlwaysPreTouch)) { |
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// The space may move left and right or expand/shrink. |
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// We'd like to enforce the desired page placement. |
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MemRegion head, tail; |
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if (last_setup_region().is_empty()) { |
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// If it's the first initialization don't limit the amount of work. |
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head = mr; |
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tail = MemRegion(mr.end(), mr.end()); |
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} else { |
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// Is there an intersection with the address space? |
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MemRegion intersection = last_setup_region().intersection(mr); |
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if (intersection.is_empty()) { |
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intersection = MemRegion(mr.end(), mr.end()); |
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} |
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// All the sizes below are in words. |
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size_t head_size = 0, tail_size = 0; |
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if (mr.start() <= intersection.start()) { |
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head_size = pointer_delta(intersection.start(), mr.start()); |
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} |
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if(intersection.end() <= mr.end()) { |
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tail_size = pointer_delta(mr.end(), intersection.end()); |
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} |
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// Limit the amount of page manipulation if necessary. |
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if (NUMASpaceResizeRate > 0 && !AlwaysPreTouch) { |
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const size_t change_size = head_size + tail_size; |
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const float setup_rate_words = NUMASpaceResizeRate >> LogBytesPerWord; |
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head_size = MIN2((size_t)(setup_rate_words * head_size / change_size), |
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head_size); |
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tail_size = MIN2((size_t)(setup_rate_words * tail_size / change_size), |
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tail_size); |
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} |
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head = MemRegion(intersection.start() - head_size, intersection.start()); |
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tail = MemRegion(intersection.end(), intersection.end() + tail_size); |
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} |
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assert(mr.contains(head) && mr.contains(tail), "Sanity"); |
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|
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if (UseNUMA) { |
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numa_setup_pages(head, clear_space); |
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numa_setup_pages(tail, clear_space); |
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} |
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|
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if (AlwaysPreTouch) { |
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pretouch_pages(head); |
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pretouch_pages(tail); |
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} |
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// Remember where we stopped so that we can continue later. |
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set_last_setup_region(MemRegion(head.start(), tail.end())); |
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} |
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set_bottom(mr.start()); |
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set_end(mr.end()); |
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if (clear_space) { |
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clear(mangle_space); |
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} |
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} |
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void MutableSpace::clear(bool mangle_space) { |
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set_top(bottom()); |
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if (ZapUnusedHeapArea && mangle_space) { |
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mangle_unused_area(); |
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} |
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} |
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|
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#ifndef PRODUCT |
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void MutableSpace::check_mangled_unused_area(HeapWord* limit) { |
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mangler()->check_mangled_unused_area(limit); |
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} |
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|
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void MutableSpace::check_mangled_unused_area_complete() { |
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mangler()->check_mangled_unused_area_complete(); |
1 | 148 |
} |
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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 MutableSpace::mangle_unused_area() { |
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mangler()->mangle_unused_area(); |
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} |
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|
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void MutableSpace::mangle_unused_area_complete() { |
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mangler()->mangle_unused_area_complete(); |
1 | 159 |
} |
160 |
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void MutableSpace::mangle_region(MemRegion mr) { |
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SpaceMangler::mangle_region(mr); |
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} |
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|
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void MutableSpace::set_top_for_allocations(HeapWord* v) { |
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mangler()->set_top_for_allocations(v); |
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} |
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|
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void MutableSpace::set_top_for_allocations() { |
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mangler()->set_top_for_allocations(top()); |
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} |
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#endif |
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|
1 | 174 |
// This version requires locking. */ |
175 |
HeapWord* MutableSpace::allocate(size_t size) { |
|
176 |
assert(Heap_lock->owned_by_self() || |
|
177 |
(SafepointSynchronize::is_at_safepoint() && |
|
178 |
Thread::current()->is_VM_thread()), |
|
179 |
"not locked"); |
|
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HeapWord* obj = top(); |
|
181 |
if (pointer_delta(end(), obj) >= size) { |
|
182 |
HeapWord* new_top = obj + size; |
|
183 |
set_top(new_top); |
|
184 |
assert(is_object_aligned((intptr_t)obj) && is_object_aligned((intptr_t)new_top), |
|
185 |
"checking alignment"); |
|
186 |
return obj; |
|
187 |
} else { |
|
188 |
return NULL; |
|
189 |
} |
|
190 |
} |
|
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||
192 |
// This version is lock-free. |
|
193 |
HeapWord* MutableSpace::cas_allocate(size_t size) { |
|
194 |
do { |
|
195 |
HeapWord* obj = top(); |
|
196 |
if (pointer_delta(end(), obj) >= size) { |
|
197 |
HeapWord* new_top = obj + size; |
|
198 |
HeapWord* result = (HeapWord*)Atomic::cmpxchg_ptr(new_top, top_addr(), obj); |
|
199 |
// result can be one of two: |
|
200 |
// the old top value: the exchange succeeded |
|
201 |
// otherwise: the new value of the top is returned. |
|
202 |
if (result != obj) { |
|
203 |
continue; // another thread beat us to the allocation, try again |
|
204 |
} |
|
205 |
assert(is_object_aligned((intptr_t)obj) && is_object_aligned((intptr_t)new_top), |
|
206 |
"checking alignment"); |
|
207 |
return obj; |
|
208 |
} else { |
|
209 |
return NULL; |
|
210 |
} |
|
211 |
} while (true); |
|
212 |
} |
|
213 |
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214 |
// Try to deallocate previous allocation. Returns true upon success. |
|
215 |
bool MutableSpace::cas_deallocate(HeapWord *obj, size_t size) { |
|
216 |
HeapWord* expected_top = obj + size; |
|
217 |
return (HeapWord*)Atomic::cmpxchg_ptr(obj, top_addr(), expected_top) == expected_top; |
|
218 |
} |
|
219 |
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void MutableSpace::oop_iterate(ExtendedOopClosure* cl) { |
1 | 221 |
HeapWord* obj_addr = bottom(); |
222 |
HeapWord* t = top(); |
|
223 |
// Could call objects iterate, but this is easier. |
|
224 |
while (obj_addr < t) { |
|
225 |
obj_addr += oop(obj_addr)->oop_iterate(cl); |
|
226 |
} |
|
227 |
} |
|
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void MutableSpace::oop_iterate_no_header(OopClosure* cl) { |
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HeapWord* obj_addr = bottom(); |
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HeapWord* t = top(); |
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// Could call objects iterate, but this is easier. |
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while (obj_addr < t) { |
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obj_addr += oop(obj_addr)->oop_iterate_no_header(cl); |
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} |
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} |
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|
1 | 238 |
void MutableSpace::object_iterate(ObjectClosure* cl) { |
239 |
HeapWord* p = bottom(); |
|
240 |
while (p < top()) { |
|
241 |
cl->do_object(oop(p)); |
|
242 |
p += oop(p)->size(); |
|
243 |
} |
|
244 |
} |
|
245 |
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246 |
void MutableSpace::print_short() const { print_short_on(tty); } |
|
247 |
void MutableSpace::print_short_on( outputStream* st) const { |
|
248 |
st->print(" space " SIZE_FORMAT "K, %d%% used", capacity_in_bytes() / K, |
|
249 |
(int) ((double) used_in_bytes() * 100 / capacity_in_bytes())); |
|
250 |
} |
|
251 |
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252 |
void MutableSpace::print() const { print_on(tty); } |
|
253 |
void MutableSpace::print_on(outputStream* st) const { |
|
254 |
MutableSpace::print_short_on(st); |
|
255 |
st->print_cr(" [" INTPTR_FORMAT "," INTPTR_FORMAT "," INTPTR_FORMAT ")", |
|
256 |
bottom(), top(), end()); |
|
257 |
} |
|
258 |
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void MutableSpace::verify() { |
1 | 260 |
HeapWord* p = bottom(); |
261 |
HeapWord* t = top(); |
|
262 |
HeapWord* prev_p = NULL; |
|
263 |
while (p < t) { |
|
264 |
oop(p)->verify(); |
|
265 |
prev_p = p; |
|
266 |
p += oop(p)->size(); |
|
267 |
} |
|
268 |
guarantee(p == top(), "end of last object must match end of space"); |
|
269 |
} |