/*
* Copyright 1997-2008 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*
*/
// 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<jweak>* _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();
};
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 _symbolKlassObj;
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 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;
static oop _emptySymbol; // Canonical empty string ("") symbol
// The particular choice of collected heap.
static CollectedHeap* _collectedHeap;
// Base address for oop-within-java-object materialization.
// NULL if using wide oops. Doubles as heap oop null value.
static address _heap_base;
// array of dummy objects used with +FullGCAlot
debug_only(static objArrayOop _fullgc_alot_dummy_array;)
// index of next entry to clear
debug_only(static int _fullgc_alot_dummy_next;)
// Compiler/dispatch support
static int _base_vtable_size; // Java vtbl size of klass Object (in words)
// Initialization
static bool _bootstrapping; // true during genesis
static bool _fully_initialized; // true after universe_init and initialize_vtables called
// the array of preallocated errors with backtraces
static objArrayOop preallocated_out_of_memory_errors() { return _preallocated_out_of_memory_error_array; }
// generate an out of memory error; if possible using an error with preallocated backtrace;
// otherwise return the given default error.
static oop gen_out_of_memory_error(oop default_err);
// Historic gc information
static size_t _heap_capacity_at_last_gc;
static size_t _heap_used_at_last_gc;
static jint initialize_heap();
static void initialize_basic_type_mirrors(TRAPS);
static void fixup_mirrors(TRAPS);
static void reinitialize_vtable_of(KlassHandle h_k, TRAPS);
static void reinitialize_itables(TRAPS);
static void compute_base_vtable_size(); // compute vtable size of class Object
static void genesis(TRAPS); // Create the initial world
// Mirrors for primitive classes (created eagerly)
static oop check_mirror(oop m) {
assert(m != NULL, "mirror not initialized");
return m;
}
// 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 symbolKlassObj() { return _symbolKlassObj; }
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 tbe 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 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; }
static oop emptySymbol() { return _emptySymbol; }
// 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; }
// The particular choice of collected heap.
static CollectedHeap* heap() { return _collectedHeap; }
// For UseCompressedOops
static address heap_base() { return _heap_base; }
static address* heap_base_addr() { return &_heap_base; }
// 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);
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);
#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; }
};