/* * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #ifndef SHARE_VM_MEMORY_UNIVERSE_HPP #define SHARE_VM_MEMORY_UNIVERSE_HPP #include "runtime/handles.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; // Common parts of a methodOop cache. This cache safely interacts with // the RedefineClasses API. // class CommonMethodOopCache : public CHeapObj { // We save the klassOop and the idnum of methodOop in order to get // the current cached methodOop. private: klassOop _klass; int _method_idnum; public: CommonMethodOopCache() { _klass = NULL; _method_idnum = -1; } ~CommonMethodOopCache() { _klass = NULL; _method_idnum = -1; } void init(klassOop k, methodOop m, TRAPS); klassOop klass() const { return _klass; } int method_idnum() const { return _method_idnum; } // GC support void oops_do(OopClosure* f) { f->do_oop((oop*)&_klass); } }; // A helper class for caching a methodOop when the user of the cache // cares about all versions of the methodOop. // class ActiveMethodOopsCache : public CommonMethodOopCache { // This subclass adds weak references to older versions of the // methodOop and a query method for a methodOop. private: // If the cached methodOop has not been redefined, then // _prev_methods will be NULL. If all of the previous // versions of the method have been collected, then // _prev_methods can have a length of zero. GrowableArray* _prev_methods; public: ActiveMethodOopsCache() { _prev_methods = NULL; } ~ActiveMethodOopsCache(); void add_previous_version(const methodOop method); bool is_same_method(const methodOop method) const; }; // A helper class for caching a methodOop when the user of the cache // only cares about the latest version of the methodOop. // class LatestMethodOopCache : public CommonMethodOopCache { // This subclass adds a getter method for the latest methodOop. public: methodOop get_methodOop(); }; // For UseCompressedOops. struct NarrowOopStruct { // 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 oops. // 0 if using wide oops or zero based unscaled narrow oops, // LogMinObjAlignmentInBytes otherwise. int _shift; // Generate code with implicit null checks for narrow oops. 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 CompactingPermGenGen; friend class VM_PopulateDumpSharedSpace; friend jint universe_init(); friend void universe2_init(); friend bool universe_post_init(); private: // Known classes in the VM static klassOop _boolArrayKlassObj; static klassOop _byteArrayKlassObj; static klassOop _charArrayKlassObj; static klassOop _intArrayKlassObj; static klassOop _shortArrayKlassObj; static klassOop _longArrayKlassObj; static klassOop _singleArrayKlassObj; static klassOop _doubleArrayKlassObj; static klassOop _typeArrayKlassObjs[T_VOID+1]; static klassOop _objectArrayKlassObj; static klassOop _methodKlassObj; static klassOop _constMethodKlassObj; static klassOop _methodDataKlassObj; static klassOop _klassKlassObj; static klassOop _arrayKlassKlassObj; static klassOop _objArrayKlassKlassObj; static klassOop _typeArrayKlassKlassObj; static klassOop _instanceKlassKlassObj; static klassOop _constantPoolKlassObj; static klassOop _constantPoolCacheKlassObj; static klassOop _compiledICHolderKlassObj; static klassOop _systemObjArrayKlassObj; // 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 typeArrayOop _the_empty_byte_array; // Canonicalized byte array static typeArrayOop _the_empty_short_array; // Canonicalized short array static typeArrayOop _the_empty_int_array; // Canonicalized int array static objArrayOop _the_empty_system_obj_array; // Canonicalized system obj array static objArrayOop _the_empty_class_klass_array; // Canonicalized obj array of type java.lang.Class static objArrayOop _the_array_interfaces_array; // Canonicalized 2-array of cloneable & serializable klasses 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 LatestMethodOopCache* _finalizer_register_cache; // static method for registering finalizable objects static LatestMethodOopCache* _loader_addClass_cache; // method for registering loaded classes in class loader vector static ActiveMethodOopsCache* _reflect_invoke_cache; // method for security checks static oop _out_of_memory_error_java_heap; // preallocated error object (no backtrace) static oop _out_of_memory_error_perm_gen; // preallocated error object (no backtrace) static oop _out_of_memory_error_array_size;// preallocated error object (no backtrace) static oop _out_of_memory_error_gc_overhead_limit; // preallocated error object (no backtrace) // 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 NarrowOopStruct _narrow_oop; // 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; } // 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 klassOop boolArrayKlassObj() { return _boolArrayKlassObj; } static klassOop byteArrayKlassObj() { return _byteArrayKlassObj; } static klassOop charArrayKlassObj() { return _charArrayKlassObj; } static klassOop intArrayKlassObj() { return _intArrayKlassObj; } static klassOop shortArrayKlassObj() { return _shortArrayKlassObj; } static klassOop longArrayKlassObj() { return _longArrayKlassObj; } static klassOop singleArrayKlassObj() { return _singleArrayKlassObj; } static klassOop doubleArrayKlassObj() { return _doubleArrayKlassObj; } static klassOop objectArrayKlassObj() { return _objectArrayKlassObj; } static klassOop typeArrayKlassObj(BasicType t) { assert((uint)t < T_VOID+1, "range check"); assert(_typeArrayKlassObjs[t] != NULL, "domain check"); return _typeArrayKlassObjs[t]; } static klassOop methodKlassObj() { return _methodKlassObj; } static klassOop constMethodKlassObj() { return _constMethodKlassObj; } static klassOop methodDataKlassObj() { return _methodDataKlassObj; } static klassOop klassKlassObj() { return _klassKlassObj; } static klassOop arrayKlassKlassObj() { return _arrayKlassKlassObj; } static klassOop objArrayKlassKlassObj() { return _objArrayKlassKlassObj; } static klassOop typeArrayKlassKlassObj() { return _typeArrayKlassKlassObj; } static klassOop instanceKlassKlassObj() { return _instanceKlassKlassObj; } static klassOop constantPoolKlassObj() { return _constantPoolKlassObj; } static klassOop constantPoolCacheKlassObj() { return _constantPoolCacheKlassObj; } static klassOop compiledICHolderKlassObj() { return _compiledICHolderKlassObj; } static klassOop systemObjArrayKlassObj() { return _systemObjArrayKlassObj; } // 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 typeArrayOop the_empty_byte_array() { return _the_empty_byte_array; } static typeArrayOop the_empty_short_array() { return _the_empty_short_array; } static typeArrayOop the_empty_int_array() { return _the_empty_int_array; } static objArrayOop the_empty_system_obj_array () { return _the_empty_system_obj_array; } static objArrayOop the_empty_class_klass_array () { return _the_empty_class_klass_array; } static objArrayOop 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 methodOop finalizer_register_method() { return _finalizer_register_cache->get_methodOop(); } static methodOop loader_addClass_method() { return _loader_addClass_cache->get_methodOop(); } static ActiveMethodOopsCache* reflect_invoke_cache() { return _reflect_invoke_cache; } 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; } // 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_perm_gen() { return gen_out_of_memory_error(_out_of_memory_error_perm_gen); } 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 klassOop* boolArrayKlassObj_addr() { return &_boolArrayKlassObj; } static klassOop* byteArrayKlassObj_addr() { return &_byteArrayKlassObj; } static klassOop* charArrayKlassObj_addr() { return &_charArrayKlassObj; } static klassOop* intArrayKlassObj_addr() { return &_intArrayKlassObj; } static klassOop* shortArrayKlassObj_addr() { return &_shortArrayKlassObj; } static klassOop* longArrayKlassObj_addr() { return &_longArrayKlassObj; } static klassOop* singleArrayKlassObj_addr() { return &_singleArrayKlassObj; } static klassOop* doubleArrayKlassObj_addr() { return &_doubleArrayKlassObj; } static klassOop* systemObjArrayKlassObj_addr() { return &_systemObjArrayKlassObj; } // The particular choice of collected heap. static CollectedHeap* heap() { return _collectedHeap; } // For UseCompressedOops static address* narrow_oop_base_addr() { return &_narrow_oop._base; } 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 void set_narrow_oop_base(address base) { _narrow_oop._base = base; } static void set_narrow_oop_shift(int shift) { _narrow_oop._shift = shift; } static bool narrow_oop_use_implicit_null_checks() { return _narrow_oop._use_implicit_null_checks; } static void set_narrow_oop_use_implicit_null_checks(bool use) { _narrow_oop._use_implicit_null_checks = use; } // 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 char* preferred_heap_base(size_t heap_size, NARROW_OOP_MODE mode); // 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); // Apply "f" to all klasses for basic types (classes not present in // SystemDictionary). static void basic_type_classes_do(void f(klassOop)); // Apply "f" to all system klasses (classes not present in SystemDictionary). static void system_classes_do(void f(klassOop)); // 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(bool allow_dirty = true, bool silent = false, VerifyOption option = VerifyOption_Default ); static int verify_count() { return _verify_count; } static void print(); static void print_on(outputStream* st); 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); static void print_heap_after_gc(outputStream* st); // 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; 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