hotspot/src/share/vm/memory/universe.hpp
author coleenp
Thu, 27 Jan 2011 16:11:27 -0800
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permissions -rw-r--r--
6990754: Use native memory and reference counting to implement SymbolTable Summary: move symbols from permgen into C heap and reference count them Reviewed-by: never, acorn, jmasa, stefank
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/*
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 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#ifndef SHARE_VM_MEMORY_UNIVERSE_HPP
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#define SHARE_VM_MEMORY_UNIVERSE_HPP
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#include "runtime/handles.hpp"
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#include "utilities/growableArray.hpp"
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// Universe is a name space holding known system classes and objects in the VM.
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//
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// Loaded classes are accessible through the SystemDictionary.
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//
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// The object heap is allocated and accessed through Universe, and various allocation
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// support is provided. Allocation by the interpreter and compiled code is done inline
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// and bails out to Scavenge::invoke_and_allocate.
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class CollectedHeap;
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class DeferredObjAllocEvent;
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// Common parts of a methodOop cache. This cache safely interacts with
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// the RedefineClasses API.
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//
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class CommonMethodOopCache : public CHeapObj {
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  // We save the klassOop and the idnum of methodOop in order to get
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  // the current cached methodOop.
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  klassOop              _klass;
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  int                   _method_idnum;
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  CommonMethodOopCache()   { _klass = NULL; _method_idnum = -1; }
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  ~CommonMethodOopCache()  { _klass = NULL; _method_idnum = -1; }
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  void     init(klassOop k, methodOop m, TRAPS);
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  klassOop klass() const         { return _klass; }
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  int      method_idnum() const  { return _method_idnum; }
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  // GC support
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  void     oops_do(OopClosure* f)  { f->do_oop((oop*)&_klass); }
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};
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// A helper class for caching a methodOop when the user of the cache
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// cares about all versions of the methodOop.
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//
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class ActiveMethodOopsCache : public CommonMethodOopCache {
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  // This subclass adds weak references to older versions of the
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  // methodOop and a query method for a methodOop.
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  // If the cached methodOop has not been redefined, then
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  // _prev_methods will be NULL. If all of the previous
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  // versions of the method have been collected, then
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  // _prev_methods can have a length of zero.
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  GrowableArray<jweak>* _prev_methods;
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  ActiveMethodOopsCache()   { _prev_methods = NULL; }
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  ~ActiveMethodOopsCache();
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  void add_previous_version(const methodOop method);
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  bool is_same_method(const methodOop method) const;
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};
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// A helper class for caching a methodOop when the user of the cache
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// only cares about the latest version of the methodOop.
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//
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class LatestMethodOopCache : public CommonMethodOopCache {
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  // This subclass adds a getter method for the latest methodOop.
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  methodOop get_methodOop();
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};
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// For UseCompressedOops.
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struct NarrowOopStruct {
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  // Base address for oop-within-java-object materialization.
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  // NULL if using wide oops or zero based narrow oops.
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  address _base;
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  // Number of shift bits for encoding/decoding narrow oops.
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  // 0 if using wide oops or zero based unscaled narrow oops,
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  // LogMinObjAlignmentInBytes otherwise.
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  int     _shift;
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  // Generate code with implicit null checks for narrow oops.
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  bool    _use_implicit_null_checks;
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};
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class Universe: AllStatic {
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  // Ugh.  Universe is much too friendly.
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  friend class MarkSweep;
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  friend class oopDesc;
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  friend class ClassLoader;
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  friend class Arguments;
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  friend class SystemDictionary;
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  friend class VMStructs;
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  friend class CompactingPermGenGen;
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  friend class VM_PopulateDumpSharedSpace;
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  friend jint  universe_init();
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  friend void  universe2_init();
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  friend bool  universe_post_init();
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  // Known classes in the VM
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  static klassOop _boolArrayKlassObj;
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  static klassOop _byteArrayKlassObj;
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  static klassOop _charArrayKlassObj;
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  static klassOop _intArrayKlassObj;
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  static klassOop _shortArrayKlassObj;
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  static klassOop _longArrayKlassObj;
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  static klassOop _singleArrayKlassObj;
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  static klassOop _doubleArrayKlassObj;
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  static klassOop _typeArrayKlassObjs[T_VOID+1];
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  static klassOop _objectArrayKlassObj;
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  static klassOop _methodKlassObj;
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  static klassOop _constMethodKlassObj;
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  static klassOop _methodDataKlassObj;
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  static klassOop _klassKlassObj;
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  static klassOop _arrayKlassKlassObj;
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  static klassOop _objArrayKlassKlassObj;
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  static klassOop _typeArrayKlassKlassObj;
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  static klassOop _instanceKlassKlassObj;
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  static klassOop _constantPoolKlassObj;
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  static klassOop _constantPoolCacheKlassObj;
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  static klassOop _compiledICHolderKlassObj;
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  static klassOop _systemObjArrayKlassObj;
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  // Known objects in the VM
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  // Primitive objects
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  static oop _int_mirror;
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  static oop _float_mirror;
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  static oop _double_mirror;
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  static oop _byte_mirror;
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  static oop _bool_mirror;
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  static oop _char_mirror;
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  static oop _long_mirror;
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  static oop _short_mirror;
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  static oop _void_mirror;
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  static oop          _main_thread_group;             // Reference to the main thread group object
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  static oop          _system_thread_group;           // Reference to the system thread group object
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  static typeArrayOop _the_empty_byte_array;          // Canonicalized byte array
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  static typeArrayOop _the_empty_short_array;         // Canonicalized short array
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  static typeArrayOop _the_empty_int_array;           // Canonicalized int array
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  static objArrayOop  _the_empty_system_obj_array;    // Canonicalized system obj array
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  static objArrayOop  _the_empty_class_klass_array;   // Canonicalized obj array of type java.lang.Class
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  static objArrayOop  _the_array_interfaces_array;    // Canonicalized 2-array of cloneable & serializable klasses
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  static oop          _the_null_string;               // A cache of "null" as a Java string
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  static oop          _the_min_jint_string;          // A cache of "-2147483648" as a Java string
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  static LatestMethodOopCache* _finalizer_register_cache; // static method for registering finalizable objects
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  static LatestMethodOopCache* _loader_addClass_cache;    // method for registering loaded classes in class loader vector
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  static ActiveMethodOopsCache* _reflect_invoke_cache;    // method for security checks
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  static oop          _out_of_memory_error_java_heap; // preallocated error object (no backtrace)
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  static oop          _out_of_memory_error_perm_gen;  // preallocated error object (no backtrace)
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  static oop          _out_of_memory_error_array_size;// preallocated error object (no backtrace)
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  static oop          _out_of_memory_error_gc_overhead_limit; // preallocated error object (no backtrace)
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  // array of preallocated error objects with backtrace
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  static objArrayOop   _preallocated_out_of_memory_error_array;
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  // number of preallocated error objects available for use
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  static volatile jint _preallocated_out_of_memory_error_avail_count;
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  static oop          _null_ptr_exception_instance;   // preallocated exception object
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  static oop          _arithmetic_exception_instance; // preallocated exception object
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  static oop          _virtual_machine_error_instance; // preallocated exception object
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  // The object used as an exception dummy when exceptions are thrown for
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  // the vm thread.
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  static oop          _vm_exception;
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  // The particular choice of collected heap.
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  static CollectedHeap* _collectedHeap;
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  // For UseCompressedOops.
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  static struct NarrowOopStruct _narrow_oop;
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  // array of dummy objects used with +FullGCAlot
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  debug_only(static objArrayOop _fullgc_alot_dummy_array;)
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  // index of next entry to clear
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  debug_only(static int         _fullgc_alot_dummy_next;)
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  // Compiler/dispatch support
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  static int  _base_vtable_size;                      // Java vtbl size of klass Object (in words)
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  // Initialization
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  static bool _bootstrapping;                         // true during genesis
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  static bool _fully_initialized;                     // true after universe_init and initialize_vtables called
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  // the array of preallocated errors with backtraces
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  static objArrayOop  preallocated_out_of_memory_errors()     { return _preallocated_out_of_memory_error_array; }
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  // generate an out of memory error; if possible using an error with preallocated backtrace;
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  // otherwise return the given default error.
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  static oop        gen_out_of_memory_error(oop default_err);
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  // Historic gc information
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  static size_t _heap_capacity_at_last_gc;
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  static size_t _heap_used_at_last_gc;
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  static jint initialize_heap();
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  static void initialize_basic_type_mirrors(TRAPS);
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  static void fixup_mirrors(TRAPS);
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  static void reinitialize_vtable_of(KlassHandle h_k, TRAPS);
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  static void reinitialize_itables(TRAPS);
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  static void compute_base_vtable_size();             // compute vtable size of class Object
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  static void genesis(TRAPS);                         // Create the initial world
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  // Mirrors for primitive classes (created eagerly)
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  static oop check_mirror(oop m) {
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    assert(m != NULL, "mirror not initialized");
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    return m;
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  }
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  // Debugging
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  static int _verify_count;                           // number of verifies done
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  // True during call to verify().  Should only be set/cleared in verify().
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  static bool _verify_in_progress;
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  static void compute_verify_oop_data();
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 public:
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  // Known classes in the VM
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  static klassOop boolArrayKlassObj()                 { return _boolArrayKlassObj;   }
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  static klassOop byteArrayKlassObj()                 { return _byteArrayKlassObj;   }
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  static klassOop charArrayKlassObj()                 { return _charArrayKlassObj;   }
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  static klassOop intArrayKlassObj()                  { return _intArrayKlassObj;    }
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  static klassOop shortArrayKlassObj()                { return _shortArrayKlassObj;  }
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  static klassOop longArrayKlassObj()                 { return _longArrayKlassObj;   }
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  static klassOop singleArrayKlassObj()               { return _singleArrayKlassObj; }
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  static klassOop doubleArrayKlassObj()               { return _doubleArrayKlassObj; }
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  static klassOop objectArrayKlassObj() {
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    return _objectArrayKlassObj;
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  }
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  static klassOop typeArrayKlassObj(BasicType t) {
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    assert((uint)t < T_VOID+1, "range check");
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    assert(_typeArrayKlassObjs[t] != NULL, "domain check");
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    return _typeArrayKlassObjs[t];
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  }
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  static klassOop methodKlassObj()                    { return _methodKlassObj;            }
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  static klassOop constMethodKlassObj()               { return _constMethodKlassObj;         }
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  static klassOop methodDataKlassObj()                { return _methodDataKlassObj;        }
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  static klassOop klassKlassObj()                     { return _klassKlassObj;             }
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  static klassOop arrayKlassKlassObj()                { return _arrayKlassKlassObj;        }
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  static klassOop objArrayKlassKlassObj()             { return _objArrayKlassKlassObj;     }
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  static klassOop typeArrayKlassKlassObj()            { return _typeArrayKlassKlassObj;    }
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  static klassOop instanceKlassKlassObj()             { return _instanceKlassKlassObj;     }
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  static klassOop constantPoolKlassObj()              { return _constantPoolKlassObj;      }
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  static klassOop constantPoolCacheKlassObj()         { return _constantPoolCacheKlassObj; }
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  static klassOop compiledICHolderKlassObj()          { return _compiledICHolderKlassObj;  }
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  static klassOop systemObjArrayKlassObj()            { return _systemObjArrayKlassObj;    }
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  // Known objects in the VM
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  static oop int_mirror()                   { return check_mirror(_int_mirror); }
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  static oop float_mirror()                 { return check_mirror(_float_mirror); }
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  static oop double_mirror()                { return check_mirror(_double_mirror); }
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  static oop byte_mirror()                  { return check_mirror(_byte_mirror); }
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  static oop bool_mirror()                  { return check_mirror(_bool_mirror); }
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  static oop char_mirror()                  { return check_mirror(_char_mirror); }
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  static oop long_mirror()                  { return check_mirror(_long_mirror); }
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  static oop short_mirror()                 { return check_mirror(_short_mirror); }
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  static oop void_mirror()                  { return check_mirror(_void_mirror); }
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  // table of same
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  static oop _mirrors[T_VOID+1];
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  static oop java_mirror(BasicType t) {
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    assert((uint)t < T_VOID+1, "range check");
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    return check_mirror(_mirrors[t]);
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  }
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  static oop      main_thread_group()                 { return _main_thread_group; }
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  static void set_main_thread_group(oop group)        { _main_thread_group = group;}
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  static oop      system_thread_group()               { return _system_thread_group; }
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  static void set_system_thread_group(oop group)      { _system_thread_group = group;}
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  static typeArrayOop the_empty_byte_array()          { return _the_empty_byte_array;          }
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  static typeArrayOop the_empty_short_array()         { return _the_empty_short_array;         }
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  static typeArrayOop the_empty_int_array()           { return _the_empty_int_array;           }
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  static objArrayOop  the_empty_system_obj_array ()   { return _the_empty_system_obj_array;    }
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  static objArrayOop  the_empty_class_klass_array ()  { return _the_empty_class_klass_array;   }
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  static objArrayOop  the_array_interfaces_array()    { return _the_array_interfaces_array;    }
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  static oop          the_null_string()               { return _the_null_string;               }
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  static oop          the_min_jint_string()          { return _the_min_jint_string;          }
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  static methodOop    finalizer_register_method()     { return _finalizer_register_cache->get_methodOop(); }
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  static methodOop    loader_addClass_method()        { return _loader_addClass_cache->get_methodOop(); }
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  static ActiveMethodOopsCache* reflect_invoke_cache() { return _reflect_invoke_cache; }
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  static oop          null_ptr_exception_instance()   { return _null_ptr_exception_instance;   }
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  static oop          arithmetic_exception_instance() { return _arithmetic_exception_instance; }
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  static oop          virtual_machine_error_instance() { return _virtual_machine_error_instance; }
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  static oop          vm_exception()                  { return _vm_exception; }
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  // OutOfMemoryError support. Returns an error with the required message. The returned error
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  // may or may not have a backtrace. If error has a backtrace then the stack trace is already
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  // filled in.
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  static oop out_of_memory_error_java_heap()          { return gen_out_of_memory_error(_out_of_memory_error_java_heap);  }
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  static oop out_of_memory_error_perm_gen()           { return gen_out_of_memory_error(_out_of_memory_error_perm_gen);   }
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  static oop out_of_memory_error_array_size()         { return gen_out_of_memory_error(_out_of_memory_error_array_size); }
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  static oop out_of_memory_error_gc_overhead_limit()  { return gen_out_of_memory_error(_out_of_memory_error_gc_overhead_limit);  }
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  // Accessors needed for fast allocation
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  static klassOop* boolArrayKlassObj_addr()           { return &_boolArrayKlassObj;   }
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  static klassOop* byteArrayKlassObj_addr()           { return &_byteArrayKlassObj;   }
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  static klassOop* charArrayKlassObj_addr()           { return &_charArrayKlassObj;   }
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  static klassOop* intArrayKlassObj_addr()            { return &_intArrayKlassObj;    }
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  static klassOop* shortArrayKlassObj_addr()          { return &_shortArrayKlassObj;  }
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  static klassOop* longArrayKlassObj_addr()           { return &_longArrayKlassObj;   }
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  static klassOop* singleArrayKlassObj_addr()         { return &_singleArrayKlassObj; }
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  static klassOop* doubleArrayKlassObj_addr()         { return &_doubleArrayKlassObj; }
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  static klassOop* systemObjArrayKlassObj_addr()      { return &_systemObjArrayKlassObj; }
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  // The particular choice of collected heap.
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  static CollectedHeap* heap() { return _collectedHeap; }
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  // For UseCompressedOops
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  static address* narrow_oop_base_addr()              { return &_narrow_oop._base; }
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  static address  narrow_oop_base()                   { return  _narrow_oop._base; }
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  static bool  is_narrow_oop_base(void* addr)         { return (narrow_oop_base() == (address)addr); }
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  static int      narrow_oop_shift()                  { return  _narrow_oop._shift; }
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  static void     set_narrow_oop_base(address base)   { _narrow_oop._base  = base; }
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  static void     set_narrow_oop_shift(int shift)     { _narrow_oop._shift = shift; }
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  static bool     narrow_oop_use_implicit_null_checks()             { return  _narrow_oop._use_implicit_null_checks; }
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  static void     set_narrow_oop_use_implicit_null_checks(bool use) { _narrow_oop._use_implicit_null_checks = use; }
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  // Narrow Oop encoding mode:
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  // 0 - Use 32-bits oops without encoding when
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  //     NarrowOopHeapBaseMin + heap_size < 4Gb
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  // 1 - Use zero based compressed oops with encoding when
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  //     NarrowOopHeapBaseMin + heap_size < 32Gb
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  // 2 - Use compressed oops with heap base + encoding.
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  enum NARROW_OOP_MODE {
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    UnscaledNarrowOop  = 0,
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    ZeroBasedNarrowOop = 1,
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    HeapBasedNarrowOop = 2
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  };
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  static char* preferred_heap_base(size_t heap_size, NARROW_OOP_MODE mode);
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1
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  // Historic gc information
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  static size_t get_heap_capacity_at_last_gc()         { return _heap_capacity_at_last_gc; }
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  static size_t get_heap_free_at_last_gc()             { return _heap_capacity_at_last_gc - _heap_used_at_last_gc; }
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  static size_t get_heap_used_at_last_gc()             { return _heap_used_at_last_gc; }
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  static void update_heap_info_at_gc();
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  // Testers
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  static bool is_bootstrapping()                      { return _bootstrapping; }
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  static bool is_fully_initialized()                  { return _fully_initialized; }
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  static inline bool element_type_should_be_aligned(BasicType type);
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  static inline bool field_type_should_be_aligned(BasicType type);
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  static bool        on_page_boundary(void* addr);
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  static bool        should_fill_in_stack_trace(Handle throwable);
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  static void check_alignment(uintx size, uintx alignment, const char* name);
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  // Finalizer support.
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  static void run_finalizers_on_exit();
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  // Iteration
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  // Apply "f" to the addresses of all the direct heap pointers maintained
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  // as static fields of "Universe".
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  static void oops_do(OopClosure* f, bool do_all = false);
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  // Apply "f" to all klasses for basic types (classes not present in
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  // SystemDictionary).
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  static void basic_type_classes_do(void f(klassOop));
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  // Apply "f" to all system klasses (classes not present in SystemDictionary).
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  static void system_classes_do(void f(klassOop));
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  // For sharing -- fill in a list of known vtable pointers.
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  static void init_self_patching_vtbl_list(void** list, int count);
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  // Debugging
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  static bool verify_in_progress() { return _verify_in_progress; }
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  static void verify(bool allow_dirty = true, bool silent = false, bool option = true);
1
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  static int  verify_count()                  { return _verify_count; }
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  static void print();
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  static void print_on(outputStream* st);
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  static void print_heap_at_SIGBREAK();
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  static void print_heap_before_gc() { print_heap_before_gc(gclog_or_tty); }
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  static void print_heap_after_gc()  { print_heap_after_gc(gclog_or_tty); }
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  static void print_heap_before_gc(outputStream* st);
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  static void print_heap_after_gc(outputStream* st);
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  // Change the number of dummy objects kept reachable by the full gc dummy
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  // array; this should trigger relocation in a sliding compaction collector.
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  debug_only(static bool release_fullgc_alot_dummy();)
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  // The non-oop pattern (see compiledIC.hpp, etc)
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  static void*   non_oop_word();
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  // Oop verification (see MacroAssembler::verify_oop)
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  static uintptr_t verify_oop_mask()          PRODUCT_RETURN0;
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  static uintptr_t verify_oop_bits()          PRODUCT_RETURN0;
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  static uintptr_t verify_mark_bits()         PRODUCT_RETURN0;
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  static uintptr_t verify_mark_mask()         PRODUCT_RETURN0;
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  static uintptr_t verify_klass_mask()        PRODUCT_RETURN0;
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  static uintptr_t verify_klass_bits()        PRODUCT_RETURN0;
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  // Flushing and deoptimization
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  static void flush_dependents_on(instanceKlassHandle dependee);
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#ifdef HOTSWAP
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  // Flushing and deoptimization in case of evolution
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  static void flush_evol_dependents_on(instanceKlassHandle dependee);
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#endif // HOTSWAP
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  // Support for fullspeed debugging
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  static void flush_dependents_on_method(methodHandle dependee);
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  // Compiler support
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  static int base_vtable_size()               { return _base_vtable_size; }
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};
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class DeferredObjAllocEvent : public CHeapObj {
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  private:
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    oop    _oop;
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    size_t _bytesize;
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    jint   _arena_id;
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  public:
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    DeferredObjAllocEvent(const oop o, const size_t s, const jint id) {
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      _oop      = o;
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      _bytesize = s;
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      _arena_id = id;
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    }
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    ~DeferredObjAllocEvent() {
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    }
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    jint   arena_id() { return _arena_id; }
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    size_t bytesize() { return _bytesize; }
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    oop    get_oop()  { return _oop; }
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};
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#endif // SHARE_VM_MEMORY_UNIVERSE_HPP