1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/memory/universe.hpp Sat Dec 01 00:00:00 2007 +0000
1.3 @@ -0,0 +1,419 @@
1.4 +/*
1.5 + * Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
1.23 + * CA 95054 USA or visit www.sun.com if you need additional information or
1.24 + * have any questions.
1.25 + *
1.26 + */
1.27 +
1.28 +// Universe is a name space holding known system classes and objects in the VM.
1.29 +//
1.30 +// Loaded classes are accessible through the SystemDictionary.
1.31 +//
1.32 +// The object heap is allocated and accessed through Universe, and various allocation
1.33 +// support is provided. Allocation by the interpreter and compiled code is done inline
1.34 +// and bails out to Scavenge::invoke_and_allocate.
1.35 +
1.36 +class CollectedHeap;
1.37 +class DeferredObjAllocEvent;
1.38 +
1.39 +
1.40 +// Common parts of a methodOop cache. This cache safely interacts with
1.41 +// the RedefineClasses API.
1.42 +//
1.43 +class CommonMethodOopCache : public CHeapObj {
1.44 + // We save the klassOop and the idnum of methodOop in order to get
1.45 + // the current cached methodOop.
1.46 + private:
1.47 + klassOop _klass;
1.48 + int _method_idnum;
1.49 +
1.50 + public:
1.51 + CommonMethodOopCache() { _klass = NULL; _method_idnum = -1; }
1.52 + ~CommonMethodOopCache() { _klass = NULL; _method_idnum = -1; }
1.53 +
1.54 + void init(klassOop k, methodOop m, TRAPS);
1.55 + klassOop klass() const { return _klass; }
1.56 + int method_idnum() const { return _method_idnum; }
1.57 +
1.58 + // GC support
1.59 + void oops_do(OopClosure* f) { f->do_oop((oop*)&_klass); }
1.60 +};
1.61 +
1.62 +
1.63 +// A helper class for caching a methodOop when the user of the cache
1.64 +// cares about all versions of the methodOop.
1.65 +//
1.66 +class ActiveMethodOopsCache : public CommonMethodOopCache {
1.67 + // This subclass adds weak references to older versions of the
1.68 + // methodOop and a query method for a methodOop.
1.69 +
1.70 + private:
1.71 + // If the cached methodOop has not been redefined, then
1.72 + // _prev_methods will be NULL. If all of the previous
1.73 + // versions of the method have been collected, then
1.74 + // _prev_methods can have a length of zero.
1.75 + GrowableArray<jweak>* _prev_methods;
1.76 +
1.77 + public:
1.78 + ActiveMethodOopsCache() { _prev_methods = NULL; }
1.79 + ~ActiveMethodOopsCache();
1.80 +
1.81 + void add_previous_version(const methodOop method);
1.82 + bool is_same_method(const methodOop method) const;
1.83 +};
1.84 +
1.85 +
1.86 +// A helper class for caching a methodOop when the user of the cache
1.87 +// only cares about the latest version of the methodOop.
1.88 +//
1.89 +class LatestMethodOopCache : public CommonMethodOopCache {
1.90 + // This subclass adds a getter method for the latest methodOop.
1.91 +
1.92 + public:
1.93 + methodOop get_methodOop();
1.94 +};
1.95 +
1.96 +
1.97 +class Universe: AllStatic {
1.98 + friend class MarkSweep;
1.99 + friend class oopDesc;
1.100 + friend class ClassLoader;
1.101 + friend class Arguments;
1.102 + friend class SystemDictionary;
1.103 + friend class VMStructs;
1.104 + friend class CompactingPermGenGen;
1.105 + friend class VM_PopulateDumpSharedSpace;
1.106 +
1.107 + friend jint universe_init();
1.108 + friend void universe2_init();
1.109 + friend bool universe_post_init();
1.110 +
1.111 + private:
1.112 + // Known classes in the VM
1.113 + static klassOop _boolArrayKlassObj;
1.114 + static klassOop _byteArrayKlassObj;
1.115 + static klassOop _charArrayKlassObj;
1.116 + static klassOop _intArrayKlassObj;
1.117 + static klassOop _shortArrayKlassObj;
1.118 + static klassOop _longArrayKlassObj;
1.119 + static klassOop _singleArrayKlassObj;
1.120 + static klassOop _doubleArrayKlassObj;
1.121 + static klassOop _typeArrayKlassObjs[T_VOID+1];
1.122 +
1.123 + static klassOop _objectArrayKlassObj;
1.124 +
1.125 + static klassOop _symbolKlassObj;
1.126 + static klassOop _methodKlassObj;
1.127 + static klassOop _constMethodKlassObj;
1.128 + static klassOop _methodDataKlassObj;
1.129 + static klassOop _klassKlassObj;
1.130 + static klassOop _arrayKlassKlassObj;
1.131 + static klassOop _objArrayKlassKlassObj;
1.132 + static klassOop _typeArrayKlassKlassObj;
1.133 + static klassOop _instanceKlassKlassObj;
1.134 + static klassOop _constantPoolKlassObj;
1.135 + static klassOop _constantPoolCacheKlassObj;
1.136 + static klassOop _compiledICHolderKlassObj;
1.137 + static klassOop _systemObjArrayKlassObj;
1.138 +
1.139 + // Known objects in the VM
1.140 +
1.141 + // Primitive objects
1.142 + static oop _int_mirror;
1.143 + static oop _float_mirror;
1.144 + static oop _double_mirror;
1.145 + static oop _byte_mirror;
1.146 + static oop _bool_mirror;
1.147 + static oop _char_mirror;
1.148 + static oop _long_mirror;
1.149 + static oop _short_mirror;
1.150 + static oop _void_mirror;
1.151 +
1.152 + static oop _main_thread_group; // Reference to the main thread group object
1.153 + static oop _system_thread_group; // Reference to the system thread group object
1.154 +
1.155 + static typeArrayOop _the_empty_byte_array; // Canonicalized byte array
1.156 + static typeArrayOop _the_empty_short_array; // Canonicalized short array
1.157 + static typeArrayOop _the_empty_int_array; // Canonicalized int array
1.158 + static objArrayOop _the_empty_system_obj_array; // Canonicalized system obj array
1.159 + static objArrayOop _the_empty_class_klass_array; // Canonicalized obj array of type java.lang.Class
1.160 + static objArrayOop _the_array_interfaces_array; // Canonicalized 2-array of cloneable & serializable klasses
1.161 + static LatestMethodOopCache* _finalizer_register_cache; // static method for registering finalizable objects
1.162 + static LatestMethodOopCache* _loader_addClass_cache; // method for registering loaded classes in class loader vector
1.163 + static ActiveMethodOopsCache* _reflect_invoke_cache; // method for security checks
1.164 + static oop _out_of_memory_error_java_heap; // preallocated error object (no backtrace)
1.165 + static oop _out_of_memory_error_perm_gen; // preallocated error object (no backtrace)
1.166 + static oop _out_of_memory_error_array_size;// preallocated error object (no backtrace)
1.167 + static oop _out_of_memory_error_gc_overhead_limit; // preallocated error object (no backtrace)
1.168 +
1.169 + // array of preallocated error objects with backtrace
1.170 + static objArrayOop _preallocated_out_of_memory_error_array;
1.171 +
1.172 + // number of preallocated error objects available for use
1.173 + static volatile jint _preallocated_out_of_memory_error_avail_count;
1.174 +
1.175 + static oop _null_ptr_exception_instance; // preallocated exception object
1.176 + static oop _arithmetic_exception_instance; // preallocated exception object
1.177 + static oop _virtual_machine_error_instance; // preallocated exception object
1.178 + // The object used as an exception dummy when exceptions are thrown for
1.179 + // the vm thread.
1.180 + static oop _vm_exception;
1.181 +
1.182 + static oop _emptySymbol; // Canonical empty string ("") symbol
1.183 +
1.184 + // The particular choice of collected heap.
1.185 + static CollectedHeap* _collectedHeap;
1.186 +
1.187 + // array of dummy objects used with +FullGCAlot
1.188 + debug_only(static objArrayOop _fullgc_alot_dummy_array;)
1.189 + // index of next entry to clear
1.190 + debug_only(static int _fullgc_alot_dummy_next;)
1.191 +
1.192 + // Compiler/dispatch support
1.193 + static int _base_vtable_size; // Java vtbl size of klass Object (in words)
1.194 +
1.195 + // Initialization
1.196 + static bool _bootstrapping; // true during genesis
1.197 + static bool _fully_initialized; // true after universe_init and initialize_vtables called
1.198 +
1.199 + // the array of preallocated errors with backtraces
1.200 + static objArrayOop preallocated_out_of_memory_errors() { return _preallocated_out_of_memory_error_array; }
1.201 +
1.202 + // generate an out of memory error; if possible using an error with preallocated backtrace;
1.203 + // otherwise return the given default error.
1.204 + static oop gen_out_of_memory_error(oop default_err);
1.205 +
1.206 + // Historic gc information
1.207 + static size_t _heap_capacity_at_last_gc;
1.208 + static size_t _heap_used_at_last_gc;
1.209 +
1.210 + static jint initialize_heap();
1.211 + static void initialize_basic_type_mirrors(TRAPS);
1.212 + static void fixup_mirrors(TRAPS);
1.213 +
1.214 + static void reinitialize_vtable_of(KlassHandle h_k, TRAPS);
1.215 + static void reinitialize_itables(TRAPS);
1.216 + static void compute_base_vtable_size(); // compute vtable size of class Object
1.217 +
1.218 + static void genesis(TRAPS); // Create the initial world
1.219 +
1.220 + // Mirrors for primitive classes (created eagerly)
1.221 + static oop check_mirror(oop m) {
1.222 + assert(m != NULL, "mirror not initialized");
1.223 + return m;
1.224 + }
1.225 +
1.226 + // Debugging
1.227 + static int _verify_count; // number of verifies done
1.228 + // True during call to verify(). Should only be set/cleared in verify().
1.229 + static bool _verify_in_progress;
1.230 +
1.231 + static void compute_verify_oop_data();
1.232 +
1.233 + public:
1.234 + // Known classes in the VM
1.235 + static klassOop boolArrayKlassObj() { return _boolArrayKlassObj; }
1.236 + static klassOop byteArrayKlassObj() { return _byteArrayKlassObj; }
1.237 + static klassOop charArrayKlassObj() { return _charArrayKlassObj; }
1.238 + static klassOop intArrayKlassObj() { return _intArrayKlassObj; }
1.239 + static klassOop shortArrayKlassObj() { return _shortArrayKlassObj; }
1.240 + static klassOop longArrayKlassObj() { return _longArrayKlassObj; }
1.241 + static klassOop singleArrayKlassObj() { return _singleArrayKlassObj; }
1.242 + static klassOop doubleArrayKlassObj() { return _doubleArrayKlassObj; }
1.243 +
1.244 + static klassOop objectArrayKlassObj() {
1.245 + return _objectArrayKlassObj;
1.246 + }
1.247 +
1.248 + static klassOop typeArrayKlassObj(BasicType t) {
1.249 + assert((uint)t < T_VOID+1, "range check");
1.250 + assert(_typeArrayKlassObjs[t] != NULL, "domain check");
1.251 + return _typeArrayKlassObjs[t];
1.252 + }
1.253 +
1.254 + static klassOop symbolKlassObj() { return _symbolKlassObj; }
1.255 + static klassOop methodKlassObj() { return _methodKlassObj; }
1.256 + static klassOop constMethodKlassObj() { return _constMethodKlassObj; }
1.257 + static klassOop methodDataKlassObj() { return _methodDataKlassObj; }
1.258 + static klassOop klassKlassObj() { return _klassKlassObj; }
1.259 + static klassOop arrayKlassKlassObj() { return _arrayKlassKlassObj; }
1.260 + static klassOop objArrayKlassKlassObj() { return _objArrayKlassKlassObj; }
1.261 + static klassOop typeArrayKlassKlassObj() { return _typeArrayKlassKlassObj; }
1.262 + static klassOop instanceKlassKlassObj() { return _instanceKlassKlassObj; }
1.263 + static klassOop constantPoolKlassObj() { return _constantPoolKlassObj; }
1.264 + static klassOop constantPoolCacheKlassObj() { return _constantPoolCacheKlassObj; }
1.265 + static klassOop compiledICHolderKlassObj() { return _compiledICHolderKlassObj; }
1.266 + static klassOop systemObjArrayKlassObj() { return _systemObjArrayKlassObj; }
1.267 +
1.268 + // Known objects in tbe VM
1.269 + static oop int_mirror() { return check_mirror(_int_mirror);
1.270 +}
1.271 + static oop float_mirror() { return check_mirror(_float_mirror); }
1.272 + static oop double_mirror() { return check_mirror(_double_mirror); }
1.273 + static oop byte_mirror() { return check_mirror(_byte_mirror); }
1.274 + static oop bool_mirror() { return check_mirror(_bool_mirror); }
1.275 + static oop char_mirror() { return check_mirror(_char_mirror); }
1.276 + static oop long_mirror() { return check_mirror(_long_mirror); }
1.277 + static oop short_mirror() { return check_mirror(_short_mirror); }
1.278 + static oop void_mirror() { return check_mirror(_void_mirror); }
1.279 +
1.280 + // table of same
1.281 + static oop _mirrors[T_VOID+1];
1.282 +
1.283 + static oop java_mirror(BasicType t) {
1.284 + assert((uint)t < T_VOID+1, "range check");
1.285 + return check_mirror(_mirrors[t]);
1.286 + }
1.287 + static oop main_thread_group() { return _main_thread_group; }
1.288 + static void set_main_thread_group(oop group) { _main_thread_group = group;}
1.289 +
1.290 + static oop system_thread_group() { return _system_thread_group; }
1.291 + static void set_system_thread_group(oop group) { _system_thread_group = group;}
1.292 +
1.293 + static typeArrayOop the_empty_byte_array() { return _the_empty_byte_array; }
1.294 + static typeArrayOop the_empty_short_array() { return _the_empty_short_array; }
1.295 + static typeArrayOop the_empty_int_array() { return _the_empty_int_array; }
1.296 + static objArrayOop the_empty_system_obj_array () { return _the_empty_system_obj_array; }
1.297 + static objArrayOop the_empty_class_klass_array () { return _the_empty_class_klass_array; }
1.298 + static objArrayOop the_array_interfaces_array() { return _the_array_interfaces_array; }
1.299 + static methodOop finalizer_register_method() { return _finalizer_register_cache->get_methodOop(); }
1.300 + static methodOop loader_addClass_method() { return _loader_addClass_cache->get_methodOop(); }
1.301 + static ActiveMethodOopsCache* reflect_invoke_cache() { return _reflect_invoke_cache; }
1.302 + static oop null_ptr_exception_instance() { return _null_ptr_exception_instance; }
1.303 + static oop arithmetic_exception_instance() { return _arithmetic_exception_instance; }
1.304 + static oop virtual_machine_error_instance() { return _virtual_machine_error_instance; }
1.305 + static oop vm_exception() { return _vm_exception; }
1.306 + static oop emptySymbol() { return _emptySymbol; }
1.307 +
1.308 + // OutOfMemoryError support. Returns an error with the required message. The returned error
1.309 + // may or may not have a backtrace. If error has a backtrace then the stack trace is already
1.310 + // filled in.
1.311 + static oop out_of_memory_error_java_heap() { return gen_out_of_memory_error(_out_of_memory_error_java_heap); }
1.312 + static oop out_of_memory_error_perm_gen() { return gen_out_of_memory_error(_out_of_memory_error_perm_gen); }
1.313 + static oop out_of_memory_error_array_size() { return gen_out_of_memory_error(_out_of_memory_error_array_size); }
1.314 + static oop out_of_memory_error_gc_overhead_limit() { return gen_out_of_memory_error(_out_of_memory_error_gc_overhead_limit); }
1.315 +
1.316 + // Accessors needed for fast allocation
1.317 + static klassOop* boolArrayKlassObj_addr() { return &_boolArrayKlassObj; }
1.318 + static klassOop* byteArrayKlassObj_addr() { return &_byteArrayKlassObj; }
1.319 + static klassOop* charArrayKlassObj_addr() { return &_charArrayKlassObj; }
1.320 + static klassOop* intArrayKlassObj_addr() { return &_intArrayKlassObj; }
1.321 + static klassOop* shortArrayKlassObj_addr() { return &_shortArrayKlassObj; }
1.322 + static klassOop* longArrayKlassObj_addr() { return &_longArrayKlassObj; }
1.323 + static klassOop* singleArrayKlassObj_addr() { return &_singleArrayKlassObj; }
1.324 + static klassOop* doubleArrayKlassObj_addr() { return &_doubleArrayKlassObj; }
1.325 +
1.326 + // The particular choice of collected heap.
1.327 + static CollectedHeap* heap() { return _collectedHeap; }
1.328 +
1.329 + // Historic gc information
1.330 + static size_t get_heap_capacity_at_last_gc() { return _heap_capacity_at_last_gc; }
1.331 + static size_t get_heap_free_at_last_gc() { return _heap_capacity_at_last_gc - _heap_used_at_last_gc; }
1.332 + static size_t get_heap_used_at_last_gc() { return _heap_used_at_last_gc; }
1.333 + static void update_heap_info_at_gc();
1.334 +
1.335 + // Testers
1.336 + static bool is_bootstrapping() { return _bootstrapping; }
1.337 + static bool is_fully_initialized() { return _fully_initialized; }
1.338 +
1.339 + static inline bool element_type_should_be_aligned(BasicType type);
1.340 + static inline bool field_type_should_be_aligned(BasicType type);
1.341 + static bool on_page_boundary(void* addr);
1.342 + static bool should_fill_in_stack_trace(Handle throwable);
1.343 + static void check_alignment(uintx size, uintx alignment, const char* name);
1.344 +
1.345 + // Finalizer support.
1.346 + static void run_finalizers_on_exit();
1.347 +
1.348 + // Iteration
1.349 +
1.350 + // Apply "f" to the addresses of all the direct heap pointers maintained
1.351 + // as static fields of "Universe".
1.352 + static void oops_do(OopClosure* f, bool do_all = false);
1.353 +
1.354 + // Apply "f" to all klasses for basic types (classes not present in
1.355 + // SystemDictionary).
1.356 + static void basic_type_classes_do(void f(klassOop));
1.357 +
1.358 + // Apply "f" to all system klasses (classes not present in SystemDictionary).
1.359 + static void system_classes_do(void f(klassOop));
1.360 +
1.361 + // For sharing -- fill in a list of known vtable pointers.
1.362 + static void init_self_patching_vtbl_list(void** list, int count);
1.363 +
1.364 + // Debugging
1.365 + static bool verify_in_progress() { return _verify_in_progress; }
1.366 + static void verify(bool allow_dirty = true, bool silent = false);
1.367 + static int verify_count() { return _verify_count; }
1.368 + static void print();
1.369 + static void print_on(outputStream* st);
1.370 + static void print_heap_at_SIGBREAK();
1.371 + static void print_heap_before_gc() { print_heap_before_gc(gclog_or_tty); }
1.372 + static void print_heap_after_gc() { print_heap_after_gc(gclog_or_tty); }
1.373 + static void print_heap_before_gc(outputStream* st);
1.374 + static void print_heap_after_gc(outputStream* st);
1.375 +
1.376 + // Change the number of dummy objects kept reachable by the full gc dummy
1.377 + // array; this should trigger relocation in a sliding compaction collector.
1.378 + debug_only(static bool release_fullgc_alot_dummy();)
1.379 + // The non-oop pattern (see compiledIC.hpp, etc)
1.380 + static void* non_oop_word();
1.381 +
1.382 + // Oop verification (see MacroAssembler::verify_oop)
1.383 + static uintptr_t verify_oop_mask() PRODUCT_RETURN0;
1.384 + static uintptr_t verify_oop_bits() PRODUCT_RETURN0;
1.385 + static uintptr_t verify_mark_bits() PRODUCT_RETURN0;
1.386 + static uintptr_t verify_mark_mask() PRODUCT_RETURN0;
1.387 + static uintptr_t verify_klass_mask() PRODUCT_RETURN0;
1.388 + static uintptr_t verify_klass_bits() PRODUCT_RETURN0;
1.389 +
1.390 + // Flushing and deoptimization
1.391 + static void flush_dependents_on(instanceKlassHandle dependee);
1.392 +#ifdef HOTSWAP
1.393 + // Flushing and deoptimization in case of evolution
1.394 + static void flush_evol_dependents_on(instanceKlassHandle dependee);
1.395 +#endif // HOTSWAP
1.396 + // Support for fullspeed debugging
1.397 + static void flush_dependents_on_method(methodHandle dependee);
1.398 +
1.399 + // Compiler support
1.400 + static int base_vtable_size() { return _base_vtable_size; }
1.401 +};
1.402 +
1.403 +class DeferredObjAllocEvent : public CHeapObj {
1.404 + private:
1.405 + oop _oop;
1.406 + size_t _bytesize;
1.407 + jint _arena_id;
1.408 +
1.409 + public:
1.410 + DeferredObjAllocEvent(const oop o, const size_t s, const jint id) {
1.411 + _oop = o;
1.412 + _bytesize = s;
1.413 + _arena_id = id;
1.414 + }
1.415 +
1.416 + ~DeferredObjAllocEvent() {
1.417 + }
1.418 +
1.419 + jint arena_id() { return _arena_id; }
1.420 + size_t bytesize() { return _bytesize; }
1.421 + oop get_oop() { return _oop; }
1.422 +};
