0N/A

1879N/A#ifndef SHARE_VM_MEMORY_COMPACTINGPERMGENGEN_HPP

1879N/A#define SHARE_VM_MEMORY_COMPACTINGPERMGENGEN_HPP

1879N/A

1879N/A#include "gc_implementation/shared/generationCounters.hpp"

1879N/A#include "memory/space.hpp"

1879N/A

0N/A

0N/Aclass PermanentGenerationSpec;

0N/A

0N/Aclass CompactingPermGenGen: public OneContigSpaceCardGeneration {

0N/A friend class VMStructs;

0N/A // Abstractly, this is a subtype that gets access to protected fields.

0N/A friend class CompactingPermGen;

0N/A

0N/Aprivate:

0N/A // Shared spaces

0N/A PermanentGenerationSpec* _spec;

0N/A size_t _shared_space_size;

0N/A VirtualSpace _ro_vs;

0N/A VirtualSpace _rw_vs;

0N/A VirtualSpace _md_vs;

0N/A VirtualSpace _mc_vs;

0N/A BlockOffsetSharedArray* _ro_bts;

0N/A BlockOffsetSharedArray* _rw_bts;

0N/A OffsetTableContigSpace* _ro_space;

0N/A OffsetTableContigSpace* _rw_space;

0N/A

1051N/A // With shared spaces there is a dichotomy in the use of the

0N/A // _virtual_space of the generation. There is a portion of the

0N/A // _virtual_space that is used for the unshared part of the

0N/A // permanent generation and a portion that is reserved for the shared part.

0N/A // The _reserved field in the generation represents both the

0N/A // unshared and shared parts of the generation. The _reserved

0N/A // variable is initialized for only the unshared part but is

0N/A // later extended to include the shared part during initialization

0N/A // if shared spaces are being used.

0N/A // The reserved size for the _virtual_space for CompactingPermGenGen

0N/A // is the size of the space for the permanent generation including the

0N/A // the shared spaces. This can be seen by the use of MaxPermSize

0N/A // in the allocation of PermanentGenerationSpec. The space for the

0N/A // shared spaces is committed separately (???).

0N/A // In general at initialization only a part of the

0N/A // space for the unshared part of the permanent generation is

0N/A // committed and more is committed as the permanent generation is

0N/A // grown. In growing the permanent generation the capacity() and

0N/A // max_capacity() of the generation are used. For the permanent

0N/A // generation (implemented with a CompactingPermGenGen) the capacity()

0N/A // is taken from the capacity of the space (_the_space variable used for the

0N/A // unshared part of the generation) and the max_capacity() is based

0N/A // on the size of the _reserved variable (which includes the size of the

0N/A // shared spaces) minus the size of the shared spaces.

0N/A

0N/A // These values are redundant, but are called out separately to avoid

0N/A // going through heap/space/gen pointers for performance.

0N/A static HeapWord* unshared_bottom;

0N/A static HeapWord* unshared_end;

0N/A static HeapWord* shared_bottom;

0N/A static HeapWord* readonly_bottom;

0N/A static HeapWord* readonly_end;

0N/A static HeapWord* readwrite_bottom;

0N/A static HeapWord* readwrite_end;

0N/A static HeapWord* miscdata_bottom;

0N/A static HeapWord* miscdata_end;

0N/A static HeapWord* misccode_bottom;

0N/A static HeapWord* misccode_end;

0N/A static HeapWord* shared_end;

0N/A

0N/A // Performance Counters

0N/A GenerationCounters* _gen_counters;

0N/A CSpaceCounters* _space_counters;

0N/A

0N/A void initialize_performance_counters();

0N/A

0N/Apublic:

0N/A

0N/A enum {

2223N/A vtbl_list_size = 17, // number of entries in the shared space vtable list.

408N/A num_virtuals = 200 // number of virtual methods in Klass (or

0N/A // subclass) objects, or greater.

0N/A };

0N/A

0N/A enum {

0N/A ro = 0, // read-only shared space in the heap

0N/A rw = 1, // read-write shared space in the heap

0N/A md = 2, // miscellaneous data for initializing tables, etc.

0N/A mc = 3, // miscellaneous code - vtable replacement.

0N/A n_regions = 4

0N/A };

0N/A

0N/A CompactingPermGenGen(ReservedSpace rs, ReservedSpace shared_rs,

0N/A size_t initial_byte_size, int level, GenRemSet* remset,

0N/A ContiguousSpace* space,

0N/A PermanentGenerationSpec* perm_spec);

0N/A

0N/A const char* name() const {

0N/A return "compacting perm gen";

0N/A }

0N/A

0N/A const char* short_name() const {

0N/A return "Perm";

0N/A }

0N/A

0N/A // Return the maximum capacity for the object space. This

0N/A // explicitly does not include the shared spaces.

0N/A size_t max_capacity() const;

0N/A

0N/A void update_counters();

0N/A

0N/A void compute_new_size() {

0N/A assert(false, "Should not call this -- handled at PermGen level.");

0N/A }

0N/A

0N/A bool must_be_youngest() const { return false; }

0N/A bool must_be_oldest() const { return false; }

0N/A

0N/A OffsetTableContigSpace* ro_space() const { return _ro_space; }

0N/A OffsetTableContigSpace* rw_space() const { return _rw_space; }

0N/A VirtualSpace* md_space() { return &_md_vs; }

0N/A VirtualSpace* mc_space() { return &_mc_vs; }

0N/A ContiguousSpace* unshared_space() const { return _the_space; }

0N/A

2062N/A static bool inline is_shared(const void* p) {

2062N/A return p >= shared_bottom && p < shared_end;

0N/A }

0N/A // RedefineClasses note: this tester is used to check residence of

0N/A // the specified oop in the shared readonly space and not whether

0N/A // the oop is readonly.

2062N/A static bool inline is_shared_readonly(const void* p) {

2062N/A return p >= readonly_bottom && p < readonly_end;

0N/A }

0N/A // RedefineClasses note: this tester is used to check residence of

0N/A // the specified oop in the shared readwrite space and not whether

0N/A // the oop is readwrite.

2062N/A static bool inline is_shared_readwrite(const void* p) {

2062N/A return p >= readwrite_bottom && p < readwrite_end;

0N/A }

0N/A

2062N/A // Checks if the pointer is either in unshared space or in shared space

0N/A inline bool is_in(const void* p) const {

2062N/A return OneContigSpaceCardGeneration::is_in(p) || is_shared(p);

0N/A }

0N/A

0N/A inline PermanentGenerationSpec* spec() const { return _spec; }

0N/A inline void set_spec(PermanentGenerationSpec* spec) { _spec = spec; }

0N/A

0N/A void pre_adjust_pointers();

0N/A void adjust_pointers();

0N/A void space_iterate(SpaceClosure* blk, bool usedOnly = false);

0N/A void print_on(outputStream* st) const;

0N/A void younger_refs_iterate(OopsInGenClosure* blk);

0N/A void compact();

0N/A void post_compact();

0N/A size_t contiguous_available() const;

0N/A

0N/A void clear_remembered_set();

0N/A void invalidate_remembered_set();

0N/A

0N/A inline bool block_is_obj(const HeapWord* addr) const {

0N/A if (addr < the_space()->top()) return true;

0N/A else if (addr < the_space()->end()) return false;

0N/A else if (addr < ro_space()->top()) return true;

0N/A else if (addr < ro_space()->end()) return false;

0N/A else if (addr < rw_space()->top()) return true;

0N/A else return false;

0N/A }

0N/A

0N/A

0N/A inline size_t block_size(const HeapWord* addr) const {

0N/A if (addr < the_space()->top()) {

0N/A return oop(addr)->size();

0N/A }

0N/A else if (addr < the_space()->end()) {

0N/A assert(addr == the_space()->top(), "non-block head arg to block_size");

0N/A return the_space()->end() - the_space()->top();

0N/A }

0N/A

0N/A else if (addr < ro_space()->top()) {

0N/A return oop(addr)->size();

0N/A }

0N/A else if (addr < ro_space()->end()) {

0N/A assert(addr == ro_space()->top(), "non-block head arg to block_size");

0N/A return ro_space()->end() - ro_space()->top();

0N/A }

0N/A

0N/A else if (addr < rw_space()->top()) {

0N/A return oop(addr)->size();

0N/A }

0N/A else {

0N/A assert(addr == rw_space()->top(), "non-block head arg to block_size");

0N/A return rw_space()->end() - rw_space()->top();

0N/A }

0N/A }

0N/A

0N/A static void generate_vtable_methods(void** vtbl_list,

0N/A void** vtable,

0N/A char** md_top, char* md_end,

0N/A char** mc_top, char* mc_end);

2062N/A static void* find_matching_vtbl_ptr(void** vtbl_list,

2062N/A void* new_vtable_start,

2062N/A void* obj);

0N/A

3679N/A void verify();

0N/A

0N/A // Serialization

4170N/A static void initialize_oops();

0N/A static void serialize_oops(SerializeOopClosure* soc);

0N/A void serialize_bts(SerializeOopClosure* soc);

0N/A

0N/A // Initiate dumping of shared file.

0N/A static jint dump_shared(GrowableArray<oop>* class_promote_order, TRAPS);

0N/A

0N/A // JVM/TI RedefineClasses() support:

0N/A // Remap the shared readonly space to shared readwrite, private if

0N/A // sharing is enabled. Simply returns true if sharing is not enabled

0N/A // or if the remapping has already been done by a prior call.

0N/A static bool remap_shared_readonly_as_readwrite();

0N/A};

1879N/A

1879N/A#endif // SHARE_VM_MEMORY_COMPACTINGPERMGENGEN_HPP