jdk8-mips64-public/hotspot: comparison src/share/vm/gc

-:cb913d743d09
+:0fa27f37d4d4
+/*
+* copyright (c) 2011, 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_IMPLEMENTATION_G1_HEAPREGIONSET_HPP
+#define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSET_HPP
+#include "gc_implementation/g1/heapRegion.hpp"
+// Large buffer for some cases where the output might be larger than normal.
+#define HRL_ERR_MSG_BUFSZ 512
+typedef FormatBuffer<HRL_ERR_MSG_BUFSZ> hrl_err_msg;
+// Set verification will be forced either if someone defines
+// HEAP_REGION_SET_FORCE_VERIFY to be 1, or in builds in which
+// asserts are compiled in.
+#ifndef HEAP_REGION_SET_FORCE_VERIFY
+#define HEAP_REGION_SET_FORCE_VERIFY defined(ASSERT)
+#endif // HEAP_REGION_SET_FORCE_VERIFY
+//////////////////// HeapRegionSetBase ////////////////////
+// Base class for all the classes that represent heap region sets. It
+// contains the basic attributes that each set needs to maintain
+// (e.g., length, region num, used bytes sum) plus any shared
+// functionality (e.g., verification).
+class hrl_ext_msg;
+class HeapRegionSetBase VALUE_OBJ_CLASS_SPEC {
+friend class hrl_ext_msg;
+protected:
+static size_t calculate_region_num(HeapRegion* hr);
+static size_t _unrealistically_long_length;
+// The number of regions added to the set. If the set contains
+// only humongous regions, this reflects only 'starts humongous'
+// regions and does not include 'continues humongous' ones.
+size_t _length;
+// The total number of regions represented by the set. If the set
+// does not contain humongous regions, this should be the same as
+// _length. If the set contains only humongous regions, this will
+// include the 'continues humongous' regions.
+size_t _region_num;
+// We don't keep track of the total capacity explicitly, we instead
+// recalculate it based on _region_num and the heap region size.
+// The sum of used bytes in the all the regions in the set.
+size_t _total_used_bytes;
+const char* _name;
+bool        _verify_in_progress;
+size_t      _calc_length;
+size_t      _calc_region_num;
+size_t      _calc_total_capacity_bytes;
+size_t      _calc_total_used_bytes;
+// verify_region() is used to ensure that the contents of a region
+// added to / removed from a set are consistent. Different sets
+// make different assumptions about the regions added to them. So
+// each set can override verify_region_extra(), which is called
+// from verify_region(), and do any extra verification it needs to
+// perform in that.
+virtual const char* verify_region_extra(HeapRegion* hr) { return NULL; }
+bool verify_region(HeapRegion* hr,
+HeapRegionSetBase* expected_containing_set);
+// Indicates whether all regions in the set should be humongous or
+// not. Only used during verification.
+virtual bool regions_humongous() = 0;
+// Indicates whether all regions in the set should be empty or
+// not. Only used during verification.
+virtual bool regions_empty() = 0;
+// Subclasses can optionally override this to do MT safety protocol
+// checks. It is called in an assert from all methods that perform
+// updates on the set (and subclasses should also call it too).
+virtual bool check_mt_safety() { return true; }
+// fill_in_ext_msg() writes the the values of the set's attributes
+// in the custom err_msg (hrl_ext_msg). fill_in_ext_msg_extra()
+// allows subclasses to append further information.
+virtual void fill_in_ext_msg_extra(hrl_ext_msg* msg) { }
+void fill_in_ext_msg(hrl_ext_msg* msg, const char* message);
+// It updates the fields of the set to reflect hr being added to
+// the set.
+inline void update_for_addition(HeapRegion* hr);
+// It updates the fields of the set to reflect hr being added to
+// the set and tags the region appropriately.
+inline void add_internal(HeapRegion* hr);
+// It updates the fields of the set to reflect hr being removed
+// from the set.
+inline void update_for_removal(HeapRegion* hr);
+// It updates the fields of the set to reflect hr being removed
+// from the set and tags the region appropriately.
+inline void remove_internal(HeapRegion* hr);
+// It clears all the fields of the sets. Note: it will not iterate
+// over the set and remove regions from it. It assumes that the
+// caller has already done so. It will literally just clear the fields.
+virtual void clear();
+HeapRegionSetBase(const char* name);
+public:
+static void set_unrealistically_long_length(size_t len);
+const char* name() { return _name; }
+size_t length() { return _length; }
+bool is_empty() { return _length == 0; }
+size_t region_num() { return _region_num; }
+size_t total_capacity_bytes() {
+return region_num() << HeapRegion::LogOfHRGrainBytes;
+}
+size_t total_used_bytes() { return _total_used_bytes; }
+virtual void verify();
+void verify_start();
+void verify_next_region(HeapRegion* hr);
+void verify_end();
+#if HEAP_REGION_SET_FORCE_VERIFY
+void verify_optional() {
+verify();
+}
+#else // HEAP_REGION_SET_FORCE_VERIFY
+void verify_optional() { }
+#endif // HEAP_REGION_SET_FORCE_VERIFY
+virtual void print_on(outputStream* out, bool print_contents = false);
+};
+// Customized err_msg for heap region sets. Apart from a
+// assert/guarantee-specific message it also prints out the values of
+// the fields of the associated set. This can be very helpful in
+// diagnosing failures.
+class hrl_ext_msg : public hrl_err_msg {
+public:
+hrl_ext_msg(HeapRegionSetBase* set, const char* message) : hrl_err_msg("") {
+set->fill_in_ext_msg(this, message);
+}
+};
+// These two macros are provided for convenience, to keep the uses of
+// these two asserts a bit more concise.
+#define hrl_assert_mt_safety_ok(_set_)                                        \
+do {                                                                        \
+assert((_set_)->check_mt_safety(), hrl_ext_msg((_set_), "MT safety"));    \
+} while (0)
+#define hrl_assert_region_ok(_set_, _hr_, _expected_)                         \
+do {                                                                        \
+assert((_set_)->verify_region((_hr_), (_expected_)),                      \
+hrl_ext_msg((_set_), "region verification"));                      \
+} while (0)
+//////////////////// HeapRegionSet ////////////////////
+#define hrl_assert_sets_match(_set1_, _set2_)                                 \
+do {                                                                        \
+assert(((_set1_)->regions_humongous() ==                                  \
+(_set2_)->regions_humongous()) && \
+((_set1_)->regions_empty() == (_set2_)->regions_empty()),          \
+hrl_err_msg("the contents of set %s and set %s should match",      \
+(_set1_)->name(), (_set2_)->name()));                  \
+} while (0)
+// This class represents heap region sets whose members are not
+// explicitly tracked. It's helpful to group regions using such sets
+// so that we can reason about all the region groups in the heap using
+// the same interface (namely, the HeapRegionSetBase API).
+class HeapRegionSet : public HeapRegionSetBase {
+protected:
+virtual const char* verify_region_extra(HeapRegion* hr) {
+if (hr->next() != NULL) {
+return "next() should always be NULL as we do not link the regions";
+}
+return HeapRegionSetBase::verify_region_extra(hr);
+}
+HeapRegionSet(const char* name) : HeapRegionSetBase(name) {
+clear();
+}
+public:
+// It adds hr to the set. The region should not be a member of
+// another set.
+inline void add(HeapRegion* hr);
+// It removes hr from the set. The region should be a member of
+// this set.
+inline void remove(HeapRegion* hr);
+// It removes a region from the set. Instead of updating the fields
+// of the set to reflect this removal, it accumulates the updates
+// in proxy_set. The idea is that proxy_set is thread-local to
+// avoid multiple threads updating the fields of the set
+// concurrently and having to synchronize. The method
+// update_from_proxy() will update the fields of the set from the
+// proxy_set.
+inline void remove_with_proxy(HeapRegion* hr, HeapRegionSet* proxy_set);
+// After multiple calls to remove_with_proxy() the updates to the
+// fields of the set are accumulated in proxy_set. This call
+// updates the fields of the set from proxy_set.
+void update_from_proxy(HeapRegionSet* proxy_set);
+};
+//////////////////// HeapRegionLinkedList ////////////////////
+// A set that links all the regions added to it in a singly-linked
+// list. We should try to avoid doing operations that iterate over
+// such lists in performance critical paths. Typically we should
+// add / remove one region at a time or concatenate two lists. All
+// those operations are done in constant time.
+class HeapRegionLinkedListIterator;
+class HeapRegionLinkedList : public HeapRegionSetBase {
+friend class HeapRegionLinkedListIterator;
+private:
+HeapRegion* _head;
+HeapRegion* _tail;
+// These are provided for use by the friend classes.
+HeapRegion* head() { return _head; }
+HeapRegion* tail() { return _tail; }
+protected:
+virtual void fill_in_ext_msg_extra(hrl_ext_msg* msg);
+// See the comment for HeapRegionSetBase::clear()
+virtual void clear();
+HeapRegionLinkedList(const char* name) : HeapRegionSetBase(name) {
+clear();
+}
+public:
+// It adds hr to the list as the new tail. The region should not be
+// a member of another set.
+inline void add_as_tail(HeapRegion* hr);
+// It removes and returns the head of the list. It assumes that the
+// list is not empty so it will return a non-NULL value.
+inline HeapRegion* remove_head();
+// Convenience method.
+inline HeapRegion* remove_head_or_null();
+// It moves the regions from from_list to this list and empties
+// from_list. The new regions will appear in the same order as they
+// were in from_list and be linked in the end of this list.
+void add_as_tail(HeapRegionLinkedList* from_list);
+// It empties the list by removing all regions from it.
+void remove_all();
+// It removes all regions in the list that are pending for removal
+// (i.e., they have been tagged with "pending_removal"). The list
+// must not be empty, target_count should reflect the exact number
+// of regions that are pending for removal in the list, and
+// target_count should be > 1 (currently, we never need to remove a
+// single region using this).
+void remove_all_pending(size_t target_count);
+virtual void verify();
+virtual void print_on(outputStream* out, bool print_contents = false);
+};
+//////////////////// HeapRegionLinkedList ////////////////////
+// Iterator class that provides a convenient way to iterator over the
+// regions in a HeapRegionLinkedList instance.
+class HeapRegionLinkedListIterator : public StackObj {
+private:
+HeapRegionLinkedList* _list;
+HeapRegion*           _curr;
+public:
+bool more_available() {
+return _curr != NULL;
+}
+HeapRegion* get_next() {
+assert(more_available(),
+"get_next() should be called when more regions are available");
+// If we are going to introduce a count in the iterator we should
+// do the "cycle" check.
+HeapRegion* hr = _curr;
+assert(_list->verify_region(hr, _list), "region verification");
+_curr = hr->next();
+return hr;
+}
+HeapRegionLinkedListIterator(HeapRegionLinkedList* list)
+: _curr(NULL), _list(list) {
+_curr = list->head();
+}
+};
+#endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSET_HPP

comparison: src/share/vm/gc_implementation/g1/heapRegionSet.hpp

src/share/vm/gc_implementation/g1/heapRegionSet.hpp

Mercurial > jdk8-mips64-public > hotspot / file comparison

comparison: src/share/vm/gc_implementation/g1/heapRegionSet.hpp

src/share/vm/gc_implementation/g1/heapRegionSet.hpp