jdk8-mips64-public/hotspot: src/share/vm/memory/compactingPermGenGen.hpp@fc9d8850ab8b (annotated)

src/share/vm/memory/compactingPermGenGen.hpp@fc9d8850ab8b (annotated)

src/share/vm/memory/compactingPermGenGen.hpp

Fri, 23 Mar 2012 11:16:05 -0400

author: coleenp
date: Fri, 23 Mar 2012 11:16:05 -0400
changeset 3682: fc9d8850ab8b
parent 2658: c7f3d0b4570f
child 3711: b632e80fc9dc
permissions: -rw-r--r--

7150058: Allocate symbols from null boot loader to an arena for NMT
Summary: Move symbol allocation to an arena so NMT doesn't have to track them at startup.
Reviewed-by: never, kamg, zgu

 /*
  * Copyright (c) 2003, 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_MEMORY_COMPACTINGPERMGENGEN_HPP
 #define SHARE_VM_MEMORY_COMPACTINGPERMGENGEN_HPP
 #include "gc_implementation/shared/generationCounters.hpp"
 #include "memory/space.hpp"
 // All heaps contains a "permanent generation," containing permanent
 // (reflective) objects.  This is like a regular generation in some ways,
 // but unlike one in others, and so is split apart.
 class PermanentGenerationSpec;
 // This is the "generation" view of a CompactingPermGen.
 // NOTE: the shared spaces used for CDS are here handled in
 // a somewhat awkward and potentially buggy fashion, see CR 6801625.
 // This infelicity should be fixed, see CR 6897789.
 class CompactingPermGenGen: public OneContigSpaceCardGeneration {
   friend class VMStructs;
   // Abstractly, this is a subtype that gets access to protected fields.
   friend class CompactingPermGen;
 private:
   // Shared spaces
   PermanentGenerationSpec* _spec;
   size_t _shared_space_size;
   VirtualSpace _ro_vs;
   VirtualSpace _rw_vs;
   VirtualSpace _md_vs;
   VirtualSpace _mc_vs;
   BlockOffsetSharedArray* _ro_bts;
   BlockOffsetSharedArray* _rw_bts;
   OffsetTableContigSpace* _ro_space;
   OffsetTableContigSpace* _rw_space;
   // With shared spaces there is a dichotomy in the use of the
   // _virtual_space of the generation.  There is a portion of the
   // _virtual_space that is used for the unshared part of the
   // permanent generation and a portion that is reserved for the shared part.
   // The _reserved field in the generation represents both the
   // unshared and shared parts of the generation.  The _reserved
   // variable is initialized for only the unshared part but is
   // later extended to include the shared part during initialization
   // if shared spaces are being used.
   // The reserved size for the _virtual_space for CompactingPermGenGen
   // is the size of the space for the permanent generation including the
   // the shared spaces.  This can be seen by the use of MaxPermSize
   // in the allocation of PermanentGenerationSpec.  The space for the
   // shared spaces is committed separately (???).
   // In general at initialization only a part of the
   // space for the unshared part of the permanent generation is
   // committed and more is committed as the permanent generation is
   // grown.  In growing the permanent generation the capacity() and
   // max_capacity() of the generation are used.  For the permanent
   // generation (implemented with a CompactingPermGenGen) the capacity()
   // is taken from the capacity of the space (_the_space variable used for the
   // unshared part of the generation) and the max_capacity() is based
   // on the size of the _reserved variable (which includes the size of the
   // shared spaces) minus the size of the shared spaces.
   // These values are redundant, but are called out separately to avoid
   // going through heap/space/gen pointers for performance.
   static HeapWord* unshared_bottom;
   static HeapWord* unshared_end;
   static HeapWord* shared_bottom;
   static HeapWord* readonly_bottom;
   static HeapWord* readonly_end;
   static HeapWord* readwrite_bottom;
   static HeapWord* readwrite_end;
   static HeapWord* miscdata_bottom;
   static HeapWord* miscdata_end;
   static HeapWord* misccode_bottom;
   static HeapWord* misccode_end;
   static HeapWord* shared_end;
   // Performance Counters
   GenerationCounters*  _gen_counters;
   CSpaceCounters*      _space_counters;
   void initialize_performance_counters();
 public:
   enum {
     vtbl_list_size = 17, // number of entries in the shared space vtable list.
     num_virtuals = 200   // number of virtual methods in Klass (or
                          // subclass) objects, or greater.
   };
   enum {
     ro = 0,  // read-only shared space in the heap
     rw = 1,  // read-write shared space in the heap
     md = 2,  // miscellaneous data for initializing tables, etc.
     mc = 3,  // miscellaneous code - vtable replacement.
     n_regions = 4
   };
   CompactingPermGenGen(ReservedSpace rs, ReservedSpace shared_rs,
                        size_t initial_byte_size, int level, GenRemSet* remset,
                        ContiguousSpace* space,
                        PermanentGenerationSpec* perm_spec);
   const char* name() const {
     return "compacting perm gen";
   }
   const char* short_name() const {
     return "Perm";
   }
   // Return the maximum capacity for the object space.  This
   // explicitly does not include the shared spaces.
   size_t max_capacity() const;
   void update_counters();
   void compute_new_size() {
     assert(false, "Should not call this -- handled at PermGen level.");
   }
   bool must_be_youngest() const { return false; }
   bool must_be_oldest() const { return false; }
   OffsetTableContigSpace* ro_space() const { return _ro_space; }
   OffsetTableContigSpace* rw_space() const { return _rw_space; }
   VirtualSpace*           md_space()       { return &_md_vs; }
   VirtualSpace*           mc_space()       { return &_mc_vs; }
   ContiguousSpace* unshared_space() const { return _the_space; }
   static bool inline is_shared(const void* p) {
     return p >= shared_bottom && p < shared_end;
   }
   // RedefineClasses note: this tester is used to check residence of
   // the specified oop in the shared readonly space and not whether
   // the oop is readonly.
   static bool inline is_shared_readonly(const void* p) {
     return p >= readonly_bottom && p < readonly_end;
   }
   // RedefineClasses note: this tester is used to check residence of
   // the specified oop in the shared readwrite space and not whether
   // the oop is readwrite.
   static bool inline is_shared_readwrite(const void* p) {
     return p >= readwrite_bottom && p < readwrite_end;
   }
   // Checks if the pointer is either in unshared space or in shared space
   inline bool is_in(const void* p) const {
     return OneContigSpaceCardGeneration::is_in(p) || is_shared(p);
   }
   inline PermanentGenerationSpec* spec() const { return _spec; }
   inline void set_spec(PermanentGenerationSpec* spec) { _spec = spec; }
   void pre_adjust_pointers();
   void adjust_pointers();
   void space_iterate(SpaceClosure* blk, bool usedOnly = false);
   void print_on(outputStream* st) const;
   void younger_refs_iterate(OopsInGenClosure* blk);
   void compact();
   void post_compact();
   size_t contiguous_available() const;
   void clear_remembered_set();
   void invalidate_remembered_set();
   inline bool block_is_obj(const HeapWord* addr) const {
     if      (addr < the_space()->top()) return true;
     else if (addr < the_space()->end()) return false;
     else if (addr < ro_space()->top())  return true;
     else if (addr < ro_space()->end())  return false;
     else if (addr < rw_space()->top())  return true;
     else                                return false;
   }
   inline size_t block_size(const HeapWord* addr) const {
     if (addr < the_space()->top()) {
       return oop(addr)->size();
     }
     else if (addr < the_space()->end()) {
       assert(addr == the_space()->top(), "non-block head arg to block_size");
       return the_space()->end() - the_space()->top();
     }
     else if (addr < ro_space()->top()) {
       return oop(addr)->size();
     }
     else if (addr < ro_space()->end()) {
       assert(addr == ro_space()->top(), "non-block head arg to block_size");
       return ro_space()->end() - ro_space()->top();
     }
     else if (addr < rw_space()->top()) {
       return oop(addr)->size();
     }
     else {
       assert(addr == rw_space()->top(), "non-block head arg to block_size");
       return rw_space()->end() - rw_space()->top();
     }
   }
   static void generate_vtable_methods(void** vtbl_list,
                                       void** vtable,
                                       char** md_top, char* md_end,
                                       char** mc_top, char* mc_end);
   static void* find_matching_vtbl_ptr(void** vtbl_list,
                                       void* new_vtable_start,
                                       void* obj);
   void verify(bool allow_dirty);
   // Serialization
   static void initialize_oops() KERNEL_RETURN;
   static void serialize_oops(SerializeOopClosure* soc);
   void serialize_bts(SerializeOopClosure* soc);
   // Initiate dumping of shared file.
   static jint dump_shared(GrowableArray<oop>* class_promote_order, TRAPS);
   // JVM/TI RedefineClasses() support:
   // Remap the shared readonly space to shared readwrite, private if
   // sharing is enabled. Simply returns true if sharing is not enabled
   // or if the remapping has already been done by a prior call.
   static bool remap_shared_readonly_as_readwrite();
 };
 #endif // SHARE_VM_MEMORY_COMPACTINGPERMGENGEN_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/memory/compactingPermGenGen.hpp@fc9d8850ab8b (annotated)

src/share/vm/memory/compactingPermGenGen.hpp