--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/memory/universe.hpp Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,419 @@
+/*
+ * Copyright 1997-2007 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 {
+ 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;
+
+ // 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; }
+
+ // 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; }
+};