Mercurial > hg > graal-compiler
view src/share/vm/gc_implementation/parallelScavenge/psYoungGen.hpp @ 11091:a55aa67bce1a
Merge
author | zgu |
---|---|
date | Thu, 04 Jul 2013 04:03:28 -0700 |
parents | da91efe96a93 |
children | 44315152d434 |
line wrap: on
line source
/* * Copyright (c) 2001, 2012, 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_PARALLELSCAVENGE_PSYOUNGGEN_HPP #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSYOUNGGEN_HPP #include "gc_implementation/parallelScavenge/objectStartArray.hpp" #include "gc_implementation/parallelScavenge/psGenerationCounters.hpp" #include "gc_implementation/parallelScavenge/psVirtualspace.hpp" #include "gc_implementation/shared/mutableSpace.hpp" #include "gc_implementation/shared/spaceCounters.hpp" class PSMarkSweepDecorator; class PSYoungGen : public CHeapObj<mtGC> { friend class VMStructs; friend class ParallelScavengeHeap; friend class AdjoiningGenerations; protected: MemRegion _reserved; PSVirtualSpace* _virtual_space; // Spaces MutableSpace* _eden_space; MutableSpace* _from_space; MutableSpace* _to_space; // MarkSweep Decorators PSMarkSweepDecorator* _eden_mark_sweep; PSMarkSweepDecorator* _from_mark_sweep; PSMarkSweepDecorator* _to_mark_sweep; // Sizing information, in bytes, set in constructor const size_t _init_gen_size; const size_t _min_gen_size; const size_t _max_gen_size; // Performance counters PSGenerationCounters* _gen_counters; SpaceCounters* _eden_counters; SpaceCounters* _from_counters; SpaceCounters* _to_counters; // Initialize the space boundaries void compute_initial_space_boundaries(); // Space boundary helper void set_space_boundaries(size_t eden_size, size_t survivor_size); virtual bool resize_generation(size_t eden_size, size_t survivor_size); virtual void resize_spaces(size_t eden_size, size_t survivor_size); // Adjust the spaces to be consistent with the virtual space. void post_resize(); // Return number of bytes that the generation can change. // These should not be used by PSYoungGen virtual size_t available_for_expansion(); virtual size_t available_for_contraction(); // Given a desired shrinkage in the size of the young generation, // return the actual size available for shrinkage. virtual size_t limit_gen_shrink(size_t desired_change); // returns the number of bytes available from the current size // down to the minimum generation size. size_t available_to_min_gen(); // Return the number of bytes available for shrinkage considering // the location the live data in the generation. virtual size_t available_to_live(); public: // Initialize the generation. PSYoungGen(size_t initial_byte_size, size_t minimum_byte_size, size_t maximum_byte_size); void initialize_work(); virtual void initialize(ReservedSpace rs, size_t alignment); virtual void initialize_virtual_space(ReservedSpace rs, size_t alignment); MemRegion reserved() const { return _reserved; } bool is_in(const void* p) const { return _virtual_space->contains((void *)p); } bool is_in_reserved(const void* p) const { return reserved().contains((void *)p); } MutableSpace* eden_space() const { return _eden_space; } MutableSpace* from_space() const { return _from_space; } MutableSpace* to_space() const { return _to_space; } PSVirtualSpace* virtual_space() const { return _virtual_space; } // For Adaptive size policy size_t min_gen_size() { return _min_gen_size; } // MarkSweep support PSMarkSweepDecorator* eden_mark_sweep() const { return _eden_mark_sweep; } PSMarkSweepDecorator* from_mark_sweep() const { return _from_mark_sweep; } PSMarkSweepDecorator* to_mark_sweep() const { return _to_mark_sweep; } void precompact(); void adjust_pointers(); void compact(); // Called during/after gc void swap_spaces(); // Resize generation using suggested free space size and survivor size // NOTE: "eden_size" and "survivor_size" are suggestions only. Current // heap layout (particularly, live objects in from space) might // not allow us to use these values. void resize(size_t eden_size, size_t survivor_size); // Size info size_t capacity_in_bytes() const; size_t used_in_bytes() const; size_t free_in_bytes() const; size_t capacity_in_words() const; size_t used_in_words() const; size_t free_in_words() const; // The max this generation can grow to size_t max_size() const { return _reserved.byte_size(); } // The max this generation can grow to if the boundary between // the generations are allowed to move. size_t gen_size_limit() const { return _max_gen_size; } bool is_maximal_no_gc() const { return true; // never expands except at a GC } // Allocation HeapWord* allocate(size_t word_size) { HeapWord* result = eden_space()->cas_allocate(word_size); return result; } HeapWord** top_addr() const { return eden_space()->top_addr(); } HeapWord** end_addr() const { return eden_space()->end_addr(); } // Iteration. void oop_iterate(ExtendedOopClosure* cl); void object_iterate(ObjectClosure* cl); virtual void reset_after_change(); virtual void reset_survivors_after_shrink(); // Performance Counter support void update_counters(); // Debugging - do not use for time critical operations void print() const; void print_on(outputStream* st) const; void print_used_change(size_t prev_used) const; virtual const char* name() const { return "PSYoungGen"; } void verify(); // Space boundary invariant checker void space_invariants() PRODUCT_RETURN; // Helper for mangling survivor spaces. void mangle_survivors(MutableSpace* s1, MemRegion s1MR, MutableSpace* s2, MemRegion s2MR) PRODUCT_RETURN; void record_spaces_top() PRODUCT_RETURN; }; #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSYOUNGGEN_HPP