--- a/src/hotspot/share/gc/g1/g1InCSetState.hpp Tue May 14 11:23:08 2019 +0530
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,142 +0,0 @@
-/*
- * Copyright (c) 2014, 2019, 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_GC_G1_G1INCSETSTATE_HPP
-#define SHARE_GC_G1_G1INCSETSTATE_HPP
-
-#include "gc/g1/g1BiasedArray.hpp"
-#include "gc/g1/heapRegion.hpp"
-
-// Per-region state during garbage collection.
-struct InCSetState {
- public:
- // We use different types to represent the state value. Particularly SPARC puts
- // values in structs from "left to right", i.e. MSB to LSB. This results in many
- // unnecessary shift operations when loading and storing values of this type.
- // This degrades performance significantly (>10%) on that platform.
- // Other tested ABIs do not seem to have this problem, and actually tend to
- // favor smaller types, so we use the smallest usable type there.
-#ifdef SPARC
- #define CSETSTATE_FORMAT INTPTR_FORMAT
- typedef intptr_t in_cset_state_t;
-#else
- #define CSETSTATE_FORMAT "%d"
- typedef int8_t in_cset_state_t;
-#endif
- private:
- in_cset_state_t _value;
- public:
- enum {
- // Selection of the values were driven to micro-optimize the encoding and
- // frequency of the checks.
- // The most common check is whether the region is in the collection set or not,
- // this encoding allows us to use an > 0 check.
- // The positive values are encoded in increasing generation order, which
- // makes getting the next generation fast by a simple increment. They are also
- // used to index into arrays.
- // The negative values are used for objects requiring various special cases,
- // for example eager reclamation of humongous objects or optional regions.
- Optional = -2, // The region is optional
- Humongous = -1, // The region is humongous
- NotInCSet = 0, // The region is not in the collection set.
- Young = 1, // The region is in the collection set and a young region.
- Old = 2, // The region is in the collection set and an old region.
- Num
- };
-
- InCSetState(in_cset_state_t value = NotInCSet) : _value(value) {
- assert(is_valid(), "Invalid state %d", _value);
- }
-
- in_cset_state_t value() const { return _value; }
-
- void set_old() { _value = Old; }
-
- bool is_in_cset_or_humongous() const { return is_in_cset() || is_humongous(); }
- bool is_in_cset() const { return _value > NotInCSet; }
-
- bool is_humongous() const { return _value == Humongous; }
- bool is_young() const { return _value == Young; }
- bool is_old() const { return _value == Old; }
- bool is_optional() const { return _value == Optional; }
-
-#ifdef ASSERT
- bool is_default() const { return _value == NotInCSet; }
- bool is_valid() const { return (_value >= Optional) && (_value < Num); }
- bool is_valid_gen() const { return (_value >= Young && _value <= Old); }
-#endif
-};
-
-// Instances of this class are used for quick tests on whether a reference points
-// into the collection set and into which generation or is a humongous object
-//
-// Each of the array's elements indicates whether the corresponding region is in
-// the collection set and if so in which generation, or a humongous region.
-//
-// We use this to speed up reference processing during young collection and
-// quickly reclaim humongous objects. For the latter, by making a humongous region
-// succeed this test, we sort-of add it to the collection set. During the reference
-// iteration closures, when we see a humongous region, we then simply mark it as
-// referenced, i.e. live.
-class G1InCSetStateFastTestBiasedMappedArray : public G1BiasedMappedArray<InCSetState> {
- protected:
- InCSetState default_value() const { return InCSetState::NotInCSet; }
- public:
- void set_optional(uintptr_t index) {
- assert(get_by_index(index).is_default(),
- "State at index " INTPTR_FORMAT " should be default but is " CSETSTATE_FORMAT, index, get_by_index(index).value());
- set_by_index(index, InCSetState::Optional);
- }
-
- void set_humongous(uintptr_t index) {
- assert(get_by_index(index).is_default(),
- "State at index " INTPTR_FORMAT " should be default but is " CSETSTATE_FORMAT, index, get_by_index(index).value());
- set_by_index(index, InCSetState::Humongous);
- }
-
- void clear_humongous(uintptr_t index) {
- set_by_index(index, InCSetState::NotInCSet);
- }
-
- void set_in_young(uintptr_t index) {
- assert(get_by_index(index).is_default(),
- "State at index " INTPTR_FORMAT " should be default but is " CSETSTATE_FORMAT, index, get_by_index(index).value());
- set_by_index(index, InCSetState::Young);
- }
-
- void set_in_old(uintptr_t index) {
- assert(get_by_index(index).is_default(),
- "State at index " INTPTR_FORMAT " should be default but is " CSETSTATE_FORMAT, index, get_by_index(index).value());
- set_by_index(index, InCSetState::Old);
- }
-
- bool is_in_cset_or_humongous(HeapWord* addr) const { return at(addr).is_in_cset_or_humongous(); }
- bool is_in_cset(HeapWord* addr) const { return at(addr).is_in_cset(); }
- bool is_in_cset(const HeapRegion* hr) const { return get_by_index(hr->hrm_index()).is_in_cset(); }
- InCSetState at(HeapWord* addr) const { return get_by_address(addr); }
- void clear() { G1BiasedMappedArray<InCSetState>::clear(); }
- void clear(const HeapRegion* hr) { return set_by_index(hr->hrm_index(), InCSetState::NotInCSet); }
-};
-
-#endif // SHARE_GC_G1_G1INCSETSTATE_HPP