| /* |
| * Copyright (c) 1997, 2019, 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_MEMORY_UNIVERSE_HPP |
| #define SHARE_MEMORY_UNIVERSE_HPP |
| |
| #include "oops/array.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; |
| |
| |
| // A helper class for caching a Method* when the user of the cache |
| // only cares about the latest version of the Method*. This cache safely |
| // interacts with the RedefineClasses API. |
| |
| class LatestMethodCache : public CHeapObj<mtClass> { |
| // We save the Klass* and the idnum of Method* in order to get |
| // the current cached Method*. |
| private: |
| Klass* _klass; |
| int _method_idnum; |
| |
| public: |
| LatestMethodCache() { _klass = NULL; _method_idnum = -1; } |
| ~LatestMethodCache() { _klass = NULL; _method_idnum = -1; } |
| |
| void init(Klass* k, Method* m); |
| Klass* klass() const { return _klass; } |
| int method_idnum() const { return _method_idnum; } |
| |
| Method* get_method(); |
| |
| // CDS support. Replace the klass in this with the archive version |
| // could use this for Enhanced Class Redefinition also. |
| void serialize(SerializeClosure* f) { |
| f->do_ptr((void**)&_klass); |
| } |
| void metaspace_pointers_do(MetaspaceClosure* it); |
| }; |
| |
| |
| // For UseCompressedOops. |
| struct NarrowPtrStruct { |
| // 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 ptrs. |
| // 0 if using wide ptrs or zero based unscaled narrow ptrs, |
| // LogMinObjAlignmentInBytes/LogKlassAlignmentInBytes otherwise. |
| int _shift; |
| // Generate code with implicit null checks for narrow ptrs. |
| bool _use_implicit_null_checks; |
| }; |
| |
| enum VerifyOption { |
| VerifyOption_Default = 0, |
| |
| // G1 |
| VerifyOption_G1UsePrevMarking = VerifyOption_Default, |
| VerifyOption_G1UseNextMarking = VerifyOption_G1UsePrevMarking + 1, |
| VerifyOption_G1UseFullMarking = VerifyOption_G1UseNextMarking + 1 |
| }; |
| |
| class Universe: AllStatic { |
| // Ugh. Universe is much too friendly. |
| friend class MarkSweep; |
| friend class oopDesc; |
| friend class ClassLoader; |
| friend class SystemDictionary; |
| friend class ReservedHeapSpace; |
| friend class VMStructs; |
| friend class VM_PopulateDumpSharedSpace; |
| friend class Metaspace; |
| friend class MetaspaceShared; |
| |
| friend jint universe_init(); |
| friend void universe2_init(); |
| friend bool universe_post_init(); |
| friend void universe_post_module_init(); |
| |
| private: |
| // Known classes in the VM |
| static Klass* _typeArrayKlassObjs[T_LONG+1]; |
| static Klass* _objectArrayKlassObj; |
| |
| // 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 objArrayOop _the_empty_class_klass_array; // Canonicalized obj array of type java.lang.Class |
| static oop _the_null_sentinel; // A unique object pointer unused except as a sentinel for null. |
| 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 LatestMethodCache* _finalizer_register_cache; // static method for registering finalizable objects |
| static LatestMethodCache* _loader_addClass_cache; // method for registering loaded classes in class loader vector |
| static LatestMethodCache* _throw_illegal_access_error_cache; // Unsafe.throwIllegalAccessError() method |
| static LatestMethodCache* _throw_no_such_method_error_cache; // Unsafe.throwNoSuchMethodError() method |
| static LatestMethodCache* _do_stack_walk_cache; // method for stack walker callback |
| |
| // preallocated error objects (no backtrace) |
| static oop _out_of_memory_error_java_heap; |
| static oop _out_of_memory_error_metaspace; |
| static oop _out_of_memory_error_class_metaspace; |
| static oop _out_of_memory_error_array_size; |
| static oop _out_of_memory_error_gc_overhead_limit; |
| static oop _out_of_memory_error_realloc_objects; |
| static oop _out_of_memory_error_retry; |
| |
| // preallocated cause message for delayed StackOverflowError |
| static oop _delayed_stack_overflow_error_message; |
| |
| static Array<int>* _the_empty_int_array; // Canonicalized int array |
| static Array<u2>* _the_empty_short_array; // Canonicalized short array |
| static Array<Klass*>* _the_empty_klass_array; // Canonicalized klass array |
| static Array<InstanceKlass*>* _the_empty_instance_klass_array; // Canonicalized instance klass array |
| static Array<Method*>* _the_empty_method_array; // Canonicalized method array |
| |
| static Array<Klass*>* _the_array_interfaces_array; |
| |
| // 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; |
| |
| // References waiting to be transferred to the ReferenceHandler |
| static oop _reference_pending_list; |
| |
| // The particular choice of collected heap. |
| static CollectedHeap* _collectedHeap; |
| |
| static intptr_t _non_oop_bits; |
| |
| // For UseCompressedOops. |
| static struct NarrowPtrStruct _narrow_oop; |
| // For UseCompressedClassPointers. |
| static struct NarrowPtrStruct _narrow_klass; |
| static address _narrow_ptrs_base; |
| // CompressedClassSpaceSize set to 1GB, but appear 3GB away from _narrow_ptrs_base during CDS dump. |
| static uint64_t _narrow_klass_range; |
| // 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 _module_initialized; // true after call_initPhase2 called |
| 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_compressed_oops(); |
| static void initialize_tlab(); |
| static void initialize_basic_type_mirrors(TRAPS); |
| static void fixup_mirrors(TRAPS); |
| |
| static void reinitialize_vtable_of(Klass* k, TRAPS); |
| static void reinitialize_vtables(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; |
| } |
| |
| static void set_narrow_oop_base(address base) { |
| assert(UseCompressedOops, "no compressed oops?"); |
| _narrow_oop._base = base; |
| } |
| static void set_narrow_klass_base(address base) { |
| assert(UseCompressedClassPointers, "no compressed klass ptrs?"); |
| _narrow_klass._base = base; |
| } |
| static void set_narrow_klass_range(uint64_t range) { |
| assert(UseCompressedClassPointers, "no compressed klass ptrs?"); |
| _narrow_klass_range = range; |
| } |
| static void set_narrow_oop_use_implicit_null_checks(bool use) { |
| assert(UseCompressedOops, "no compressed ptrs?"); |
| _narrow_oop._use_implicit_null_checks = use; |
| } |
| |
| // 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 long verify_flags; |
| |
| static uintptr_t _verify_oop_mask; |
| static uintptr_t _verify_oop_bits; |
| |
| static void calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) PRODUCT_RETURN; |
| |
| public: |
| // Known classes in the VM |
| static Klass* boolArrayKlassObj() { return typeArrayKlassObj(T_BOOLEAN); } |
| static Klass* byteArrayKlassObj() { return typeArrayKlassObj(T_BYTE); } |
| static Klass* charArrayKlassObj() { return typeArrayKlassObj(T_CHAR); } |
| static Klass* intArrayKlassObj() { return typeArrayKlassObj(T_INT); } |
| static Klass* shortArrayKlassObj() { return typeArrayKlassObj(T_SHORT); } |
| static Klass* longArrayKlassObj() { return typeArrayKlassObj(T_LONG); } |
| static Klass* floatArrayKlassObj() { return typeArrayKlassObj(T_FLOAT); } |
| static Klass* doubleArrayKlassObj() { return typeArrayKlassObj(T_DOUBLE); } |
| |
| static Klass* objectArrayKlassObj() { return _objectArrayKlassObj; } |
| |
| static Klass* typeArrayKlassObj(BasicType t) { |
| assert((uint)t >= T_BOOLEAN, "range check for type: %s", type2name(t)); |
| assert((uint)t < T_LONG+1, "range check for type: %s", type2name(t)); |
| assert(_typeArrayKlassObjs[t] != NULL, "domain check"); |
| return _typeArrayKlassObjs[t]; |
| } |
| |
| // 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); } |
| |
| static void set_int_mirror(oop m) { _int_mirror = m; } |
| static void set_float_mirror(oop m) { _float_mirror = m; } |
| static void set_double_mirror(oop m) { _double_mirror = m; } |
| static void set_byte_mirror(oop m) { _byte_mirror = m; } |
| static void set_bool_mirror(oop m) { _bool_mirror = m; } |
| static void set_char_mirror(oop m) { _char_mirror = m; } |
| static void set_long_mirror(oop m) { _long_mirror = m; } |
| static void set_short_mirror(oop m) { _short_mirror = m; } |
| static void set_void_mirror(oop m) { _void_mirror = m; } |
| |
| // 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 objArrayOop the_empty_class_klass_array () { return _the_empty_class_klass_array; } |
| static Array<Klass*>* 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 Method* finalizer_register_method() { return _finalizer_register_cache->get_method(); } |
| static Method* loader_addClass_method() { return _loader_addClass_cache->get_method(); } |
| |
| static Method* throw_illegal_access_error() { return _throw_illegal_access_error_cache->get_method(); } |
| static Method* throw_no_such_method_error() { return _throw_no_such_method_error_cache->get_method(); } |
| |
| static Method* do_stack_walk_method() { return _do_stack_walk_cache->get_method(); } |
| |
| static oop the_null_sentinel() { return _the_null_sentinel; } |
| static address the_null_sentinel_addr() { return (address) &_the_null_sentinel; } |
| |
| // Function to initialize these |
| static void initialize_known_methods(TRAPS); |
| |
| 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; } |
| |
| // Reference pending list manipulation. Access is protected by |
| // Heap_lock. The getter, setter and predicate require the caller |
| // owns the lock. Swap is used by parallel non-concurrent reference |
| // processing threads, where some higher level controller owns |
| // Heap_lock, so requires the lock is locked, but not necessarily by |
| // the current thread. |
| static oop reference_pending_list(); |
| static void set_reference_pending_list(oop list); |
| static bool has_reference_pending_list(); |
| static oop swap_reference_pending_list(oop list); |
| |
| static Array<int>* the_empty_int_array() { return _the_empty_int_array; } |
| static Array<u2>* the_empty_short_array() { return _the_empty_short_array; } |
| static Array<Method*>* the_empty_method_array() { return _the_empty_method_array; } |
| static Array<Klass*>* the_empty_klass_array() { return _the_empty_klass_array; } |
| static Array<InstanceKlass*>* the_empty_instance_klass_array() { return _the_empty_instance_klass_array; } |
| |
| // 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_metaspace() { return gen_out_of_memory_error(_out_of_memory_error_metaspace); } |
| static oop out_of_memory_error_class_metaspace() { return gen_out_of_memory_error(_out_of_memory_error_class_metaspace); } |
| 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); } |
| static oop out_of_memory_error_realloc_objects() { return gen_out_of_memory_error(_out_of_memory_error_realloc_objects); } |
| // Throw default _out_of_memory_error_retry object as it will never propagate out of the VM |
| static oop out_of_memory_error_retry() { return _out_of_memory_error_retry; } |
| static oop delayed_stack_overflow_error_message() { return _delayed_stack_overflow_error_message; } |
| |
| // The particular choice of collected heap. |
| static CollectedHeap* heap() { return _collectedHeap; } |
| |
| // For UseCompressedOops |
| // 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 disjoint heap base if |
| // base is 32G-aligned and base > 0. This allows certain |
| // optimizations in encoding/decoding. |
| // Disjoint: Bits used in base are disjoint from bits used |
| // for oops ==> oop = (cOop << 3) | base. One can disjoint |
| // the bits of an oop into base and compressed oop. |
| // 3 - Use compressed oops with heap base + encoding. |
| enum NARROW_OOP_MODE { |
| UnscaledNarrowOop = 0, |
| ZeroBasedNarrowOop = 1, |
| DisjointBaseNarrowOop = 2, |
| HeapBasedNarrowOop = 3, |
| AnyNarrowOopMode = 4 |
| }; |
| static NARROW_OOP_MODE narrow_oop_mode(); |
| static const char* narrow_oop_mode_to_string(NARROW_OOP_MODE mode); |
| static address narrow_oop_base() { return _narrow_oop._base; } |
| // Test whether bits of addr and possible offsets into the heap overlap. |
| static bool is_disjoint_heap_base_address(address addr) { |
| return (((uint64_t)(intptr_t)addr) & |
| (((uint64_t)UCONST64(0xFFFFffffFFFFffff)) >> (32-LogMinObjAlignmentInBytes))) == 0; |
| } |
| // Check for disjoint base compressed oops. |
| static bool narrow_oop_base_disjoint() { |
| return _narrow_oop._base != NULL && is_disjoint_heap_base_address(_narrow_oop._base); |
| } |
| // Check for real heapbased compressed oops. |
| // We must subtract the base as the bits overlap. |
| // If we negate above function, we also get unscaled and zerobased. |
| static bool narrow_oop_base_overlaps() { |
| return _narrow_oop._base != NULL && !is_disjoint_heap_base_address(_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 bool narrow_oop_use_implicit_null_checks() { return _narrow_oop._use_implicit_null_checks; } |
| |
| // For UseCompressedClassPointers |
| static address narrow_klass_base() { return _narrow_klass._base; } |
| static uint64_t narrow_klass_range() { return _narrow_klass_range; } |
| static int narrow_klass_shift() { return _narrow_klass._shift; } |
| |
| static address* narrow_ptrs_base_addr() { return &_narrow_ptrs_base; } |
| static void set_narrow_ptrs_base(address a) { _narrow_ptrs_base = a; } |
| static address narrow_ptrs_base() { return _narrow_ptrs_base; } |
| |
| static void print_compressed_oops_mode(outputStream* st); |
| |
| // this is set in vm_version on sparc (and then reset in universe afaict) |
| static void set_narrow_oop_shift(int shift) { |
| _narrow_oop._shift = shift; |
| } |
| |
| static void set_narrow_klass_shift(int shift) { |
| assert(shift == 0 || shift == LogKlassAlignmentInBytes, "invalid shift for klass ptrs"); |
| _narrow_klass._shift = shift; |
| } |
| |
| // Reserve Java heap and determine CompressedOops mode |
| static ReservedSpace reserve_heap(size_t heap_size, size_t alignment); |
| |
| // Historic gc information |
| 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_module_initialized() { return _module_initialized; } |
| static bool is_fully_initialized() { return _fully_initialized; } |
| |
| 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); |
| |
| // Iteration |
| |
| // Apply "f" to the addresses of all the direct heap pointers maintained |
| // as static fields of "Universe". |
| static void oops_do(OopClosure* f); |
| |
| // CDS support |
| static void serialize(SerializeClosure* f); |
| |
| // Apply "f" to all klasses for basic types (classes not present in |
| // SystemDictionary). |
| static void basic_type_classes_do(void f(Klass*)); |
| static void basic_type_classes_do(KlassClosure* closure); |
| static void metaspace_pointers_do(MetaspaceClosure* it); |
| |
| // Debugging |
| enum VERIFY_FLAGS { |
| Verify_Threads = 1, |
| Verify_Heap = 2, |
| Verify_SymbolTable = 4, |
| Verify_StringTable = 8, |
| Verify_CodeCache = 16, |
| Verify_SystemDictionary = 32, |
| Verify_ClassLoaderDataGraph = 64, |
| Verify_MetaspaceUtils = 128, |
| Verify_JNIHandles = 256, |
| Verify_CodeCacheOops = 512, |
| Verify_ResolvedMethodTable = 1024, |
| Verify_All = -1 |
| }; |
| static void initialize_verify_flags(); |
| static bool should_verify_subset(uint subset); |
| static bool verify_in_progress() { return _verify_in_progress; } |
| static void verify(VerifyOption option, const char* prefix); |
| static void verify(const char* prefix) { |
| verify(VerifyOption_Default, prefix); |
| } |
| static void verify() { |
| verify(""); |
| } |
| |
| static int verify_count() { return _verify_count; } |
| static void print_on(outputStream* st); |
| static void print_heap_at_SIGBREAK(); |
| static void print_heap_before_gc(); |
| static void print_heap_after_gc(); |
| |
| // 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; |
| |
| // Compiler support |
| static int base_vtable_size() { return _base_vtable_size; } |
| }; |
| |
| #endif // SHARE_MEMORY_UNIVERSE_HPP |
