jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/shared/markSweep.inline.hpp@595c0f60d50d

8029075: String deduplication in G1
Summary: Implementation of JEP 192, http://openjdk.java.net/jeps/192
Reviewed-by: brutisso, tschatzl, coleenp

     1 /*

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     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

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     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

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    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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    25 #ifndef SHARE_VM_GC_IMPLEMENTATION_SHARED_MARKSWEEP_INLINE_HPP

    26 #define SHARE_VM_GC_IMPLEMENTATION_SHARED_MARKSWEEP_INLINE_HPP

    28 #include "gc_implementation/shared/markSweep.hpp"

    29 #include "gc_interface/collectedHeap.hpp"

    30 #include "utilities/stack.inline.hpp"

    31 #include "utilities/macros.hpp"

    32 #if INCLUDE_ALL_GCS

    33 #include "gc_implementation/g1/g1StringDedup.hpp"

    34 #include "gc_implementation/parallelScavenge/psParallelCompact.hpp"

    35 #endif // INCLUDE_ALL_GCS

    37 inline void MarkSweep::mark_object(oop obj) {

    38 #if INCLUDE_ALL_GCS

    39   if (G1StringDedup::is_enabled()) {

    40     // We must enqueue the object before it is marked

    41     // as we otherwise can't read the object's age.

    42     G1StringDedup::enqueue_from_mark(obj);

    43   }

    44 #endif

    45   // some marks may contain information we need to preserve so we store them away

    46   // and overwrite the mark.  We'll restore it at the end of markSweep.

    47   markOop mark = obj->mark();

    48   obj->set_mark(markOopDesc::prototype()->set_marked());

    50   if (mark->must_be_preserved(obj)) {

    51     preserve_mark(obj, mark);

    52   }

    53 }

    55 inline void MarkSweep::follow_klass(Klass* klass) {

    56   oop op = klass->klass_holder();

    57   MarkSweep::mark_and_push(&op);

    58 }

    60 template <class T> inline void MarkSweep::follow_root(T* p) {

    61   assert(!Universe::heap()->is_in_reserved(p),

    62          "roots shouldn't be things within the heap");

    63   T heap_oop = oopDesc::load_heap_oop(p);

    64   if (!oopDesc::is_null(heap_oop)) {

    65     oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);

    66     if (!obj->mark()->is_marked()) {

    67       mark_object(obj);

    68       obj->follow_contents();

    69     }

    70   }

    71   follow_stack();

    72 }

    74 template <class T> inline void MarkSweep::mark_and_push(T* p) {

    75 //  assert(Universe::heap()->is_in_reserved(p), "should be in object space");

    76   T heap_oop = oopDesc::load_heap_oop(p);

    77   if (!oopDesc::is_null(heap_oop)) {

    78     oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);

    79     if (!obj->mark()->is_marked()) {

    80       mark_object(obj);

    81       _marking_stack.push(obj);

    82     }

    83   }

    84 }

    86 void MarkSweep::push_objarray(oop obj, size_t index) {

    87   ObjArrayTask task(obj, index);

    88   assert(task.is_valid(), "bad ObjArrayTask");

    89   _objarray_stack.push(task);

    90 }

    92 template <class T> inline void MarkSweep::adjust_pointer(T* p) {

    93   T heap_oop = oopDesc::load_heap_oop(p);

    94   if (!oopDesc::is_null(heap_oop)) {

    95     oop obj     = oopDesc::decode_heap_oop_not_null(heap_oop);

    96     oop new_obj = oop(obj->mark()->decode_pointer());

    97     assert(new_obj != NULL ||                         // is forwarding ptr?

    98            obj->mark() == markOopDesc::prototype() || // not gc marked?

    99            (UseBiasedLocking && obj->mark()->has_bias_pattern()),

   100                                                       // not gc marked?

   101            "should be forwarded");

   102     if (new_obj != NULL) {

   103       assert(Universe::heap()->is_in_reserved(new_obj),

   104              "should be in object space");

   105       oopDesc::encode_store_heap_oop_not_null(p, new_obj);

   106     }

   107   }

   108 }

   110 template <class T> inline void MarkSweep::KeepAliveClosure::do_oop_work(T* p) {

   111   mark_and_push(p);

   112 }

   114 #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_MARKSWEEP_INLINE_HPP

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