jdk8-mips64-public/hotspot: src/share/vm/memory/universe.hpp@740e263c80c6 (annotated)

src/share/vm/memory/universe.hpp@740e263c80c6 (annotated)

src/share/vm/memory/universe.hpp

Thu, 15 Aug 2013 20:04:10 -0400

author: hseigel
date: Thu, 15 Aug 2013 20:04:10 -0400
changeset 5528: 740e263c80c6
parent 5508: 85147f28faba
child 5578: 4c84d351cca9
permissions: -rw-r--r--

8003424: Enable Class Data Sharing for CompressedOops
8016729: ObjectAlignmentInBytes=16 now forces the use of heap based compressed oops
8005933: The -Xshare:auto option is ignored for -server
Summary: Move klass metaspace above the heap and support CDS with compressed klass ptrs.
Reviewed-by: coleenp, kvn, mgerdin, tschatzl, stefank

 /*
  * Copyright (c) 1997, 2013, 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_UNIVERSE_HPP
 #define SHARE_VM_MEMORY_UNIVERSE_HPP
 #include "runtime/handles.hpp"
 #include "utilities/array.hpp"
 #include "utilities/growableArray.hpp"
 // Universe is a name space holding known system classes and objects in the VM.
 //
 // Loaded classes are accessible through the SystemDictionary.
 //
 // The object heap is allocated and accessed through Universe, and various allocation
 // support is provided. Allocation by the interpreter and compiled code is done inline
 // and bails out to Scavenge::invoke_and_allocate.
 class CollectedHeap;
 class DeferredObjAllocEvent;
 // A helper class for caching a Method* when the user of the cache
 // only cares about the latest version of the Method*.  This cache safely
 // interacts with the RedefineClasses API.
 class LatestMethodCache : public CHeapObj<mtClass> {
   // We save the Klass* and the idnum of Method* in order to get
   // the current cached Method*.
  private:
   Klass*                _klass;
   int                   _method_idnum;
  public:
   LatestMethodCache()   { _klass = NULL; _method_idnum = -1; }
   ~LatestMethodCache()  { _klass = NULL; _method_idnum = -1; }
   void   init(Klass* k, Method* m);
   Klass* klass() const           { return _klass; }
   int    method_idnum() const    { return _method_idnum; }
   Method* get_method();
   // Enhanced Class Redefinition support
   void classes_do(void f(Klass*)) {
     f(_klass);
   }
   // CDS support.  Replace the klass in this with the archive version
   // could use this for Enhanced Class Redefinition also.
   void serialize(SerializeClosure* f) {
     f->do_ptr((void**)&_klass);
   }
 };
 // For UseCompressedOops.
 struct NarrowPtrStruct {
   // Base address for oop-within-java-object materialization.
   // NULL if using wide oops or zero based narrow oops.
   address _base;
   // Number of shift bits for encoding/decoding narrow ptrs.
   // 0 if using wide ptrs or zero based unscaled narrow ptrs,
   // LogMinObjAlignmentInBytes/LogKlassAlignmentInBytes otherwise.
   int     _shift;
   // Generate code with implicit null checks for narrow ptrs.
   bool    _use_implicit_null_checks;
 };
 enum VerifyOption {
       VerifyOption_Default = 0,
       // G1
       VerifyOption_G1UsePrevMarking = VerifyOption_Default,
       VerifyOption_G1UseNextMarking = VerifyOption_G1UsePrevMarking + 1,
       VerifyOption_G1UseMarkWord    = VerifyOption_G1UseNextMarking + 1
 };
 class Universe: AllStatic {
   // Ugh.  Universe is much too friendly.
   friend class MarkSweep;
   friend class oopDesc;
   friend class ClassLoader;
   friend class Arguments;
   friend class SystemDictionary;
   friend class VMStructs;
   friend class VM_PopulateDumpSharedSpace;
   friend class Metaspace;
   friend jint  universe_init();
   friend void  universe2_init();
   friend bool  universe_post_init();
  private:
   // Known classes in the VM
   static Klass* _boolArrayKlassObj;
   static Klass* _byteArrayKlassObj;
   static Klass* _charArrayKlassObj;
   static Klass* _intArrayKlassObj;
   static Klass* _shortArrayKlassObj;
   static Klass* _longArrayKlassObj;
   static Klass* _singleArrayKlassObj;
   static Klass* _doubleArrayKlassObj;
   static Klass* _typeArrayKlassObjs[T_VOID+1];
   static Klass* _objectArrayKlassObj;
   // Known objects in the VM
   // Primitive objects
   static oop _int_mirror;
   static oop _float_mirror;
   static oop _double_mirror;
   static oop _byte_mirror;
   static oop _bool_mirror;
   static oop _char_mirror;
   static oop _long_mirror;
   static oop _short_mirror;
   static oop _void_mirror;
   static oop          _main_thread_group;             // Reference to the main thread group object
   static oop          _system_thread_group;           // Reference to the system thread group object
   static objArrayOop  _the_empty_class_klass_array;   // Canonicalized obj array of type java.lang.Class
   static oop          _the_null_string;               // A cache of "null" as a Java string
   static oop          _the_min_jint_string;          // A cache of "-2147483648" as a Java string
   static LatestMethodCache* _finalizer_register_cache; // static method for registering finalizable objects
   static LatestMethodCache* _loader_addClass_cache;    // method for registering loaded classes in class loader vector
   static LatestMethodCache* _pd_implies_cache;         // method for checking protection domain attributes
   // preallocated error objects (no backtrace)
   static oop          _out_of_memory_error_java_heap;
   static oop          _out_of_memory_error_metaspace;
   static oop          _out_of_memory_error_class_metaspace;
   static oop          _out_of_memory_error_array_size;
   static oop          _out_of_memory_error_gc_overhead_limit;
   static Array<int>*       _the_empty_int_array;    // Canonicalized int array
   static Array<u2>*        _the_empty_short_array;  // Canonicalized short array
   static Array<Klass*>*  _the_empty_klass_array;  // Canonicalized klass obj array
   static Array<Method*>* _the_empty_method_array; // Canonicalized method obj array
   static Array<Klass*>*  _the_array_interfaces_array;
   // array of preallocated error objects with backtrace
   static objArrayOop   _preallocated_out_of_memory_error_array;
   // number of preallocated error objects available for use
   static volatile jint _preallocated_out_of_memory_error_avail_count;
   static oop          _null_ptr_exception_instance;   // preallocated exception object
   static oop          _arithmetic_exception_instance; // preallocated exception object
   static oop          _virtual_machine_error_instance; // preallocated exception object
   // The object used as an exception dummy when exceptions are thrown for
   // the vm thread.
   static oop          _vm_exception;
   // The particular choice of collected heap.
   static CollectedHeap* _collectedHeap;
   // For UseCompressedOops.
   static struct NarrowPtrStruct _narrow_oop;
   // For UseCompressedKlassPointers.
   static struct NarrowPtrStruct _narrow_klass;
   static address _narrow_ptrs_base;
   // array of dummy objects used with +FullGCAlot
   debug_only(static objArrayOop _fullgc_alot_dummy_array;)
   // index of next entry to clear
   debug_only(static int         _fullgc_alot_dummy_next;)
   // Compiler/dispatch support
   static int  _base_vtable_size;                      // Java vtbl size of klass Object (in words)
   // Initialization
   static bool _bootstrapping;                         // true during genesis
   static bool _fully_initialized;                     // true after universe_init and initialize_vtables called
   // the array of preallocated errors with backtraces
   static objArrayOop  preallocated_out_of_memory_errors()     { return _preallocated_out_of_memory_error_array; }
   // generate an out of memory error; if possible using an error with preallocated backtrace;
   // otherwise return the given default error.
   static oop        gen_out_of_memory_error(oop default_err);
   // Historic gc information
   static size_t _heap_capacity_at_last_gc;
   static size_t _heap_used_at_last_gc;
   static jint initialize_heap();
   static void initialize_basic_type_mirrors(TRAPS);
   static void fixup_mirrors(TRAPS);
   static void reinitialize_vtable_of(KlassHandle h_k, TRAPS);
   static void reinitialize_itables(TRAPS);
   static void compute_base_vtable_size();             // compute vtable size of class Object
   static void genesis(TRAPS);                         // Create the initial world
   // Mirrors for primitive classes (created eagerly)
   static oop check_mirror(oop m) {
     assert(m != NULL, "mirror not initialized");
     return m;
   }
   static void     set_narrow_oop_base(address base) {
     assert(UseCompressedOops, "no compressed oops?");
     _narrow_oop._base    = base;
   }
   static void     set_narrow_klass_base(address base) {
     assert(UseCompressedKlassPointers, "no compressed klass ptrs?");
     _narrow_klass._base   = base;
   }
   static void     set_narrow_oop_use_implicit_null_checks(bool use) {
     assert(UseCompressedOops, "no compressed ptrs?");
     _narrow_oop._use_implicit_null_checks   = use;
   }
   // Debugging
   static int _verify_count;                           // number of verifies done
   // True during call to verify().  Should only be set/cleared in verify().
   static bool _verify_in_progress;
   static void compute_verify_oop_data();
  public:
   // Known classes in the VM
   static Klass* boolArrayKlassObj()                 { return _boolArrayKlassObj;   }
   static Klass* byteArrayKlassObj()                 { return _byteArrayKlassObj;   }
   static Klass* charArrayKlassObj()                 { return _charArrayKlassObj;   }
   static Klass* intArrayKlassObj()                  { return _intArrayKlassObj;    }
   static Klass* shortArrayKlassObj()                { return _shortArrayKlassObj;  }
   static Klass* longArrayKlassObj()                 { return _longArrayKlassObj;   }
   static Klass* singleArrayKlassObj()               { return _singleArrayKlassObj; }
   static Klass* doubleArrayKlassObj()               { return _doubleArrayKlassObj; }
   static Klass* objectArrayKlassObj() {
     return _objectArrayKlassObj;
   }
   static Klass* typeArrayKlassObj(BasicType t) {
     assert((uint)t < T_VOID+1, err_msg("range check for type: %s", type2name(t)));
     assert(_typeArrayKlassObjs[t] != NULL, "domain check");
     return _typeArrayKlassObjs[t];
   }
   // Known objects in the VM
   static oop int_mirror()                   { return check_mirror(_int_mirror); }
   static oop float_mirror()                 { return check_mirror(_float_mirror); }
   static oop double_mirror()                { return check_mirror(_double_mirror); }
   static oop byte_mirror()                  { return check_mirror(_byte_mirror); }
   static oop bool_mirror()                  { return check_mirror(_bool_mirror); }
   static oop char_mirror()                  { return check_mirror(_char_mirror); }
   static oop long_mirror()                  { return check_mirror(_long_mirror); }
   static oop short_mirror()                 { return check_mirror(_short_mirror); }
   static oop void_mirror()                  { return check_mirror(_void_mirror); }
   // table of same
   static oop _mirrors[T_VOID+1];
   static oop java_mirror(BasicType t) {
     assert((uint)t < T_VOID+1, "range check");
     return check_mirror(_mirrors[t]);
   }
   static oop      main_thread_group()                 { return _main_thread_group; }
   static void set_main_thread_group(oop group)        { _main_thread_group = group;}
   static oop      system_thread_group()               { return _system_thread_group; }
   static void set_system_thread_group(oop group)      { _system_thread_group = group;}
   static objArrayOop  the_empty_class_klass_array ()  { return _the_empty_class_klass_array;   }
   static Array<Klass*>* the_array_interfaces_array() { return _the_array_interfaces_array;   }
   static oop          the_null_string()               { return _the_null_string;               }
   static oop          the_min_jint_string()          { return _the_min_jint_string;          }
   static Method*      finalizer_register_method()     { return _finalizer_register_cache->get_method(); }
   static Method*      loader_addClass_method()        { return _loader_addClass_cache->get_method(); }
   static Method*      protection_domain_implies_method() { return _pd_implies_cache->get_method(); }
   static oop          null_ptr_exception_instance()   { return _null_ptr_exception_instance;   }
   static oop          arithmetic_exception_instance() { return _arithmetic_exception_instance; }
   static oop          virtual_machine_error_instance() { return _virtual_machine_error_instance; }
   static oop          vm_exception()                  { return _vm_exception; }
   static Array<int>*       the_empty_int_array()    { return _the_empty_int_array; }
   static Array<u2>*        the_empty_short_array()  { return _the_empty_short_array; }
   static Array<Method*>* the_empty_method_array() { return _the_empty_method_array; }
   static Array<Klass*>*  the_empty_klass_array()  { return _the_empty_klass_array; }
   // OutOfMemoryError support. Returns an error with the required message. The returned error
   // may or may not have a backtrace. If error has a backtrace then the stack trace is already
   // filled in.
   static oop out_of_memory_error_java_heap()          { return gen_out_of_memory_error(_out_of_memory_error_java_heap);  }
   static oop out_of_memory_error_metaspace()          { return gen_out_of_memory_error(_out_of_memory_error_metaspace);   }
   static oop out_of_memory_error_class_metaspace()    { return gen_out_of_memory_error(_out_of_memory_error_class_metaspace);   }
   static oop out_of_memory_error_array_size()         { return gen_out_of_memory_error(_out_of_memory_error_array_size); }
   static oop out_of_memory_error_gc_overhead_limit()  { return gen_out_of_memory_error(_out_of_memory_error_gc_overhead_limit);  }
   // Accessors needed for fast allocation
   static Klass** boolArrayKlassObj_addr()           { return &_boolArrayKlassObj;   }
   static Klass** byteArrayKlassObj_addr()           { return &_byteArrayKlassObj;   }
   static Klass** charArrayKlassObj_addr()           { return &_charArrayKlassObj;   }
   static Klass** intArrayKlassObj_addr()            { return &_intArrayKlassObj;    }
   static Klass** shortArrayKlassObj_addr()          { return &_shortArrayKlassObj;  }
   static Klass** longArrayKlassObj_addr()           { return &_longArrayKlassObj;   }
   static Klass** singleArrayKlassObj_addr()         { return &_singleArrayKlassObj; }
   static Klass** doubleArrayKlassObj_addr()         { return &_doubleArrayKlassObj; }
   static Klass** objectArrayKlassObj_addr()         { return &_objectArrayKlassObj; }
   // The particular choice of collected heap.
   static CollectedHeap* heap() { return _collectedHeap; }
   // For UseCompressedOops
   // Narrow Oop encoding mode:
   // 0 - Use 32-bits oops without encoding when
   //     NarrowOopHeapBaseMin + heap_size < 4Gb
   // 1 - Use zero based compressed oops with encoding when
   //     NarrowOopHeapBaseMin + heap_size < 32Gb
   // 2 - Use compressed oops with heap base + encoding.
   enum NARROW_OOP_MODE {
     UnscaledNarrowOop  = 0,
     ZeroBasedNarrowOop = 1,
     HeapBasedNarrowOop = 2
   };
   static NARROW_OOP_MODE narrow_oop_mode();
   static const char* narrow_oop_mode_to_string(NARROW_OOP_MODE mode);
   static char*    preferred_heap_base(size_t heap_size, NARROW_OOP_MODE mode);
   static char*    preferred_metaspace_base(size_t heap_size, NARROW_OOP_MODE mode);
   static address  narrow_oop_base()                       { return  _narrow_oop._base; }
   static bool  is_narrow_oop_base(void* addr)             { return (narrow_oop_base() == (address)addr); }
   static int      narrow_oop_shift()                      { return  _narrow_oop._shift; }
   static bool     narrow_oop_use_implicit_null_checks()   { return  _narrow_oop._use_implicit_null_checks; }
   // For UseCompressedKlassPointers
   static address  narrow_klass_base()                     { return  _narrow_klass._base; }
   static bool  is_narrow_klass_base(void* addr)           { return (narrow_klass_base() == (address)addr); }
   static int      narrow_klass_shift()                    { return  _narrow_klass._shift; }
   static bool     narrow_klass_use_implicit_null_checks() { return  _narrow_klass._use_implicit_null_checks; }
   static address* narrow_ptrs_base_addr()                 { return &_narrow_ptrs_base; }
   static void     set_narrow_ptrs_base(address a)         { _narrow_ptrs_base = a; }
   static address  narrow_ptrs_base()                      { return _narrow_ptrs_base; }
   // this is set in vm_version on sparc (and then reset in universe afaict)
   static void     set_narrow_oop_shift(int shift)         {
     _narrow_oop._shift   = shift;
   }
   static void     set_narrow_klass_shift(int shift)       {
     assert(shift == 0 || shift == LogKlassAlignmentInBytes, "invalid shift for klass ptrs");
     _narrow_klass._shift   = shift;
   }
   // Reserve Java heap and determine CompressedOops mode
   static ReservedSpace reserve_heap(size_t heap_size, size_t alignment);
   // Historic gc information
   static size_t get_heap_capacity_at_last_gc()         { return _heap_capacity_at_last_gc; }
   static size_t get_heap_free_at_last_gc()             { return _heap_capacity_at_last_gc - _heap_used_at_last_gc; }
   static size_t get_heap_used_at_last_gc()             { return _heap_used_at_last_gc; }
   static void update_heap_info_at_gc();
   // Testers
   static bool is_bootstrapping()                      { return _bootstrapping; }
   static bool is_fully_initialized()                  { return _fully_initialized; }
   static inline bool element_type_should_be_aligned(BasicType type);
   static inline bool field_type_should_be_aligned(BasicType type);
   static bool        on_page_boundary(void* addr);
   static bool        should_fill_in_stack_trace(Handle throwable);
   static void check_alignment(uintx size, uintx alignment, const char* name);
   // Finalizer support.
   static void run_finalizers_on_exit();
   // Iteration
   // Apply "f" to the addresses of all the direct heap pointers maintained
   // as static fields of "Universe".
   static void oops_do(OopClosure* f, bool do_all = false);
   // CDS support
   static void serialize(SerializeClosure* f, bool do_all = false);
   // Apply "f" to all klasses for basic types (classes not present in
   // SystemDictionary).
   static void basic_type_classes_do(void f(Klass*));
   // For sharing -- fill in a list of known vtable pointers.
   static void init_self_patching_vtbl_list(void** list, int count);
   // Debugging
   static bool verify_in_progress() { return _verify_in_progress; }
   static void verify(VerifyOption option, const char* prefix, bool silent = VerifySilently);
   static void verify(const char* prefix, bool silent = VerifySilently) {
     verify(VerifyOption_Default, prefix, silent);
   }
   static void verify(bool silent = VerifySilently) {
     verify("", silent);
   }
   static int  verify_count()       { return _verify_count; }
   // The default behavior is to call print_on() on gclog_or_tty.
   static void print();
   // The extended parameter determines which method on the heap will
   // be called: print_on() (extended == false) or print_extended_on()
   // (extended == true).
   static void print_on(outputStream* st, bool extended = false);
   static void print_heap_at_SIGBREAK();
   static void print_heap_before_gc() { print_heap_before_gc(gclog_or_tty); }
   static void print_heap_after_gc()  { print_heap_after_gc(gclog_or_tty); }
   static void print_heap_before_gc(outputStream* st, bool ignore_extended = false);
   static void print_heap_after_gc(outputStream* st, bool ignore_extended = false);
   // Change the number of dummy objects kept reachable by the full gc dummy
   // array; this should trigger relocation in a sliding compaction collector.
   debug_only(static bool release_fullgc_alot_dummy();)
   // The non-oop pattern (see compiledIC.hpp, etc)
   static void*   non_oop_word();
   // Oop verification (see MacroAssembler::verify_oop)
   static uintptr_t verify_oop_mask()          PRODUCT_RETURN0;
   static uintptr_t verify_oop_bits()          PRODUCT_RETURN0;
   static uintptr_t verify_mark_bits()         PRODUCT_RETURN0;
   static uintptr_t verify_mark_mask()         PRODUCT_RETURN0;
   // Flushing and deoptimization
   static void flush_dependents_on(instanceKlassHandle dependee);
   static void flush_dependents_on(Handle call_site, Handle method_handle);
 #ifdef HOTSWAP
   // Flushing and deoptimization in case of evolution
   static void flush_evol_dependents_on(instanceKlassHandle dependee);
 #endif // HOTSWAP
   // Support for fullspeed debugging
   static void flush_dependents_on_method(methodHandle dependee);
   // Compiler support
   static int base_vtable_size()               { return _base_vtable_size; }
 };
 class DeferredObjAllocEvent : public CHeapObj<mtInternal> {
   private:
     oop    _oop;
     size_t _bytesize;
     jint   _arena_id;
   public:
     DeferredObjAllocEvent(const oop o, const size_t s, const jint id) {
       _oop      = o;
       _bytesize = s;
       _arena_id = id;
     }
     ~DeferredObjAllocEvent() {
     }
     jint   arena_id() { return _arena_id; }
     size_t bytesize() { return _bytesize; }
     oop    get_oop()  { return _oop; }
 };
 #endif // SHARE_VM_MEMORY_UNIVERSE_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/memory/universe.hpp@740e263c80c6 (annotated)

src/share/vm/memory/universe.hpp