480 lines
22 KiB
C++
480 lines
22 KiB
C++
/*
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* Copyright (c) 1997, 2011, 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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private:
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klassOop _klass;
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int _method_idnum;
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public:
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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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private:
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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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public:
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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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public:
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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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enum VerifyOption {
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VerifyOption_Default = 0,
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// G1
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VerifyOption_G1UsePrevMarking = VerifyOption_Default,
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VerifyOption_G1UseNextMarking = VerifyOption_G1UsePrevMarking + 1,
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VerifyOption_G1UseMarkWord = VerifyOption_G1UseNextMarking + 1
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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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private:
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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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// 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,
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|
VerifyOption option = VerifyOption_Default );
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static int verify_count() { return _verify_count; }
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// The default behavior is to call print_on() on gclog_or_tty.
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|
static void print();
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// The extended parameter determines which method on the heap will
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// be called: print_on() (extended == false) or print_extended_on()
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// (extended == true).
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static void print_on(outputStream* st, bool extended = false);
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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, bool ignore_extended = false);
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|
static void print_heap_after_gc(outputStream* st, bool ignore_extended = false);
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|
|
|
// Change the number of dummy objects kept reachable by the full gc dummy
|
|
// 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)
|
|
static void* non_oop_word();
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|
|
|
// 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;
|
|
static uintptr_t verify_klass_mask() PRODUCT_RETURN0;
|
|
static uintptr_t verify_klass_bits() 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 {
|
|
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
|