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8153203: Remove liveRange.hpp

Browse source 
Reviewed-by: mgerdin, jwilhelm
This commit is contained in:
Bengt Rutisson 2016-04-01 10:16:31 +02:00
parent ee442d71e1
commit 0d7e6c5add
6 changed files with 16 additions and 107 deletions
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1
hotspot/src/share/vm/gc/cms/compactibleFreeListSpace.cpp
View file

@ -30,7 +30,6 @@
#include "gc/shared/blockOffsetTable.inline.hpp"
#include "gc/shared/collectedHeap.inline.hpp"
#include "gc/shared/genCollectedHeap.hpp"
#include "gc/shared/liveRange.hpp"
#include "gc/shared/space.inline.hpp"
#include "gc/shared/spaceDecorator.hpp"
#include "memory/allocation.inline.hpp"

1
hotspot/src/share/vm/gc/g1/heapRegion.cpp
View file

@ -34,7 +34,6 @@
#include "gc/g1/heapRegionRemSet.hpp"
#include "gc/g1/heapRegionTracer.hpp"
#include "gc/shared/genOopClosures.inline.hpp"
#include "gc/shared/liveRange.hpp"
#include "gc/shared/space.inline.hpp"
#include "logging/log.hpp"
#include "memory/iterator.hpp"

33
hotspot/src/share/vm/gc/parallel/psMarkSweepDecorator.cpp
View file

@ -29,7 +29,6 @@
#include "gc/parallel/psMarkSweep.hpp"
#include "gc/parallel/psMarkSweepDecorator.hpp"
#include "gc/serial/markSweep.inline.hpp"
#include "gc/shared/liveRange.hpp"
#include "gc/shared/spaceDecorator.hpp"
#include "oops/oop.inline.hpp"
#include "runtime/prefetch.inline.hpp"
@ -107,9 +106,6 @@ void PSMarkSweepDecorator::precompact() {
HeapWord* end_of_live= q; /* One byte beyond the last byte of the last
live object. */
HeapWord* first_dead = space()->end(); /* The first dead object. */
LiveRange* liveRange = NULL; /* The current live range, recorded in the
first header of preceding free area. */
_first_dead = first_dead;
const intx interval = PrefetchScanIntervalInBytes;
@ -231,17 +227,8 @@ void PSMarkSweepDecorator::precompact() {
}
}
/* for the previous LiveRange, record the end of the live objects. */
if (liveRange) {
liveRange->set_end(q);
}
/* record the current LiveRange object.
* liveRange->start() is overlaid on the mark word.
*/
liveRange = (LiveRange*)q;
liveRange->set_start(end);
liveRange->set_end(end);
// q is a pointer to a dead object. Use this dead memory to store a pointer to the next live object.
(*(HeapWord**)q) = end;
/* see if this is the first dead region. */
if (q < first_dead) {
@ -254,9 +241,6 @@ void PSMarkSweepDecorator::precompact() {
}
assert(q == t, "just checking");
if (liveRange != NULL) {
liveRange->set_end(q);
}
_end_of_live = end_of_live;
if (end_of_live < first_dead) {
first_dead = end_of_live;
@ -307,9 +291,8 @@ void PSMarkSweepDecorator::adjust_pointers() {
if (_first_dead == t) {
q = t;
} else {
// $$$ This is funky. Using this to read the previously written
// LiveRange. See also use below.
q = (HeapWord*)oop(_first_dead)->mark()->decode_pointer();
// The first dead object should contain a pointer to the first live object
q = *(HeapWord**)_first_dead;
}
}
const intx interval = PrefetchScanIntervalInBytes;
@ -325,11 +308,11 @@ void PSMarkSweepDecorator::adjust_pointers() {
debug_only(prev_q = q);
q += size;
} else {
// q is not a live object, so its mark should point at the next
// live object
debug_only(prev_q = q);
q = (HeapWord*) oop(q)->mark()->decode_pointer();
assert(q > prev_q, "we should be moving forward through memory");
// The first dead object is no longer an object. At that memory address,
// there is a pointer to the first live object that the previous phase found.
q = *(HeapWord**)q;
assert(q > prev_q, "we should be moving forward through memory, q: " PTR_FORMAT ", prev_q: " PTR_FORMAT, p2i(q), p2i(prev_q));
}
}

55
hotspot/src/share/vm/gc/shared/liveRange.hpp
View file

@ -1,55 +0,0 @@
/*
* Copyright (c) 2001, 2015, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
#ifndef SHARE_VM_GC_SHARED_LIVERANGE_HPP
#define SHARE_VM_GC_SHARED_LIVERANGE_HPP
#include "memory/memRegion.hpp"
#include "utilities/copy.hpp"
// This is a shared helper class used during phase 3 and 4 to move all the objects
// Dead regions in a Space are linked together to keep track of the live regions
// so that the live data can be traversed quickly without having to look at each
// object.
class LiveRange: public MemRegion {
public:
LiveRange(HeapWord* bottom, HeapWord* top): MemRegion(bottom, top) {}
void set_end(HeapWord* e) {
assert(e >= start(), "should be a non-zero range");
MemRegion::set_end(e);
}
void set_word_size(size_t ws) {
MemRegion::set_word_size(ws);
}
LiveRange * next() { return (LiveRange *) end(); }
void move_to(HeapWord* destination) {
Copy::aligned_conjoint_words(start(), destination, word_size());
}
};
#endif // SHARE_VM_GC_SHARED_LIVERANGE_HPP

1
hotspot/src/share/vm/gc/shared/space.cpp
View file

@ -30,7 +30,6 @@
#include "gc/shared/collectedHeap.inline.hpp"
#include "gc/shared/genCollectedHeap.hpp"
#include "gc/shared/genOopClosures.inline.hpp"
#include "gc/shared/liveRange.hpp"
#include "gc/shared/space.hpp"
#include "gc/shared/space.inline.hpp"
#include "gc/shared/spaceDecorator.hpp"

32
hotspot/src/share/vm/gc/shared/space.inline.hpp
View file

@ -28,7 +28,6 @@
#include "gc/serial/markSweep.inline.hpp"
#include "gc/shared/collectedHeap.hpp"
#include "gc/shared/generation.hpp"
#include "gc/shared/liveRange.hpp"
#include "gc/shared/space.hpp"
#include "gc/shared/spaceDecorator.hpp"
#include "memory/universe.hpp"
@ -117,9 +116,6 @@ inline void CompactibleSpace::scan_and_forward(SpaceType* space, CompactPoint* c
HeapWord* end_of_live= q; // One byte beyond the last byte of the last
// live object.
HeapWord* first_dead = space->end(); // The first dead object.
LiveRange* liveRange = NULL; // The current live range, recorded in the
// first header of preceding free area.
space->_first_dead = first_dead;
const intx interval = PrefetchScanIntervalInBytes;
@ -158,16 +154,8 @@ inline void CompactibleSpace::scan_and_forward(SpaceType* space, CompactPoint* c
// otherwise, it really is a free region.
// for the previous LiveRange, record the end of the live objects.
if (liveRange) {
liveRange->set_end(q);
}
// record the current LiveRange object.
// liveRange->start() is overlaid on the mark word.
liveRange = (LiveRange*)q;
liveRange->set_start(end);
liveRange->set_end(end);
// q is a pointer to a dead object. Use this dead memory to store a pointer to the next live object.
(*(HeapWord**)q) = end;
// see if this is the first dead region.
if (q < first_dead) {
@ -180,9 +168,6 @@ inline void CompactibleSpace::scan_and_forward(SpaceType* space, CompactPoint* c
}
assert(q == t, "just checking");
if (liveRange != NULL) {
liveRange->set_end(q);
}
space->_end_of_live = end_of_live;
if (end_of_live < first_dead) {
first_dead = end_of_live;
@ -227,9 +212,9 @@ inline void CompactibleSpace::scan_and_adjust_pointers(SpaceType* space) {
if (space->_first_dead == t) {
q = t;
} else {
// $$$ This is funky. Using this to read the previously written
// LiveRange. See also use below.
q = (HeapWord*)oop(space->_first_dead)->mark()->decode_pointer();
// The first dead object is no longer an object. At that memory address,
// there is a pointer to the first live object that the previous phase found.
q = *((HeapWord**)(space->_first_dead));
}
}
@ -247,11 +232,10 @@ inline void CompactibleSpace::scan_and_adjust_pointers(SpaceType* space) {
debug_only(prev_q = q);
q += size;
} else {
// q is not a live object, so its mark should point at the next
// live object
debug_only(prev_q = q);
q = (HeapWord*) oop(q)->mark()->decode_pointer();
assert(q > prev_q, "we should be moving forward through memory");
// q is not a live object, instead it points at the next live object
q = *(HeapWord**)q;
assert(q > prev_q, "we should be moving forward through memory, q: " PTR_FORMAT ", prev_q: " PTR_FORMAT, p2i(q), p2i(prev_q));
}
}