377 lines
16 KiB
C++
377 lines
16 KiB
C++
/*
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* Copyright (c) 1997, 2020, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#ifndef SHARE_MEMORY_UNIVERSE_HPP
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#define SHARE_MEMORY_UNIVERSE_HPP
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#include "gc/shared/verifyOption.hpp"
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#include "oops/array.hpp"
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#include "oops/oopHandle.hpp"
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#include "runtime/handles.hpp"
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#include "utilities/growableArray.hpp"
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// Universe is a name space holding known system classes and objects in the VM.
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//
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// Loaded classes are accessible through the SystemDictionary.
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//
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// The object heap is allocated and accessed through Universe, and various allocation
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// support is provided. Allocation by the interpreter and compiled code is done inline
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// and bails out to Scavenge::invoke_and_allocate.
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class CollectedHeap;
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class DeferredObjAllocEvent;
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class OopStorage;
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// A helper class for caching a Method* when the user of the cache
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// only cares about the latest version of the Method*. This cache safely
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// interacts with the RedefineClasses API.
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class LatestMethodCache : public CHeapObj<mtClass> {
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// We save the Klass* and the idnum of Method* in order to get
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// the current cached Method*.
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private:
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Klass* _klass;
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int _method_idnum;
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public:
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LatestMethodCache() { _klass = NULL; _method_idnum = -1; }
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~LatestMethodCache() { _klass = NULL; _method_idnum = -1; }
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void init(Klass* k, Method* m);
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Klass* klass() const { return _klass; }
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int method_idnum() const { return _method_idnum; }
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Method* get_method();
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// CDS support. Replace the klass in this with the archive version
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// could use this for Enhanced Class Redefinition also.
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void serialize(SerializeClosure* f) {
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f->do_ptr((void**)&_klass);
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}
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void metaspace_pointers_do(MetaspaceClosure* it);
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};
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class Universe: AllStatic {
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// Ugh. Universe is much too friendly.
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friend class MarkSweep;
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friend class oopDesc;
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friend class ClassLoader;
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friend class SystemDictionary;
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friend class ReservedHeapSpace;
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friend class VMStructs;
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friend class VM_PopulateDumpSharedSpace;
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friend class Metaspace;
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friend class MetaspaceShared;
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friend jint universe_init();
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friend void universe2_init();
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friend bool universe_post_init();
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friend void universe_post_module_init();
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private:
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// Known classes in the VM
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static Klass* _typeArrayKlassObjs[T_LONG+1];
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static Klass* _objectArrayKlassObj;
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// Known objects in the VM
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static OopHandle _main_thread_group; // Reference to the main thread group object
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static OopHandle _system_thread_group; // Reference to the system thread group object
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static OopHandle _the_empty_class_array; // Canonicalized obj array of type java.lang.Class
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static OopHandle _the_null_string; // A cache of "null" as a Java string
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static OopHandle _the_min_jint_string; // A cache of "-2147483648" as a Java string
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static OopHandle _the_null_sentinel; // A unique object pointer unused except as a sentinel for null.
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// preallocated error objects (no backtrace)
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static OopHandle _out_of_memory_errors;
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// preallocated cause message for delayed StackOverflowError
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static OopHandle _delayed_stack_overflow_error_message;
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static LatestMethodCache* _finalizer_register_cache; // static method for registering finalizable objects
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static LatestMethodCache* _loader_addClass_cache; // method for registering loaded classes in class loader vector
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static LatestMethodCache* _throw_illegal_access_error_cache; // Unsafe.throwIllegalAccessError() method
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static LatestMethodCache* _throw_no_such_method_error_cache; // Unsafe.throwNoSuchMethodError() method
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static LatestMethodCache* _do_stack_walk_cache; // method for stack walker callback
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static Array<int>* _the_empty_int_array; // Canonicalized int array
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static Array<u2>* _the_empty_short_array; // Canonicalized short array
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static Array<Klass*>* _the_empty_klass_array; // Canonicalized klass array
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static Array<InstanceKlass*>* _the_empty_instance_klass_array; // Canonicalized instance klass array
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static Array<Method*>* _the_empty_method_array; // Canonicalized method array
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static Array<Klass*>* _the_array_interfaces_array;
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// array of preallocated error objects with backtrace
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static OopHandle _preallocated_out_of_memory_error_array;
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// number of preallocated error objects available for use
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static volatile jint _preallocated_out_of_memory_error_avail_count;
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static OopHandle _null_ptr_exception_instance; // preallocated exception object
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static OopHandle _arithmetic_exception_instance; // preallocated exception object
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static OopHandle _virtual_machine_error_instance; // preallocated exception object
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// References waiting to be transferred to the ReferenceHandler
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static OopHandle _reference_pending_list;
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// The particular choice of collected heap.
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static CollectedHeap* _collectedHeap;
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static intptr_t _non_oop_bits;
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// array of dummy objects used with +FullGCAlot
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debug_only(static OopHandle _fullgc_alot_dummy_array;)
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debug_only(static int _fullgc_alot_dummy_next;)
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// Compiler/dispatch support
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static int _base_vtable_size; // Java vtbl size of klass Object (in words)
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// Initialization
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static bool _bootstrapping; // true during genesis
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static bool _module_initialized; // true after call_initPhase2 called
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static bool _fully_initialized; // true after universe_init and initialize_vtables called
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// the array of preallocated errors with backtraces
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static objArrayOop preallocated_out_of_memory_errors();
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static objArrayOop out_of_memory_errors();
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// generate an out of memory error; if possible using an error with preallocated backtrace;
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// otherwise return the given default error.
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static oop gen_out_of_memory_error(oop default_err);
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static OopStorage* _vm_weak;
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static OopStorage* _vm_global;
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static jint initialize_heap();
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static void initialize_tlab();
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static void initialize_basic_type_mirrors(TRAPS);
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static void fixup_mirrors(TRAPS);
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static void reinitialize_vtable_of(Klass* k, TRAPS);
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static void reinitialize_vtables(TRAPS);
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static void reinitialize_itables(TRAPS);
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static void compute_base_vtable_size(); // compute vtable size of class Object
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static void genesis(TRAPS); // Create the initial world
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// Mirrors for primitive classes (created eagerly)
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static oop check_mirror(oop m) {
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assert(m != NULL, "mirror not initialized");
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return m;
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}
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// Debugging
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static int _verify_count; // number of verifies done
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// True during call to verify(). Should only be set/cleared in verify().
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static bool _verify_in_progress;
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static long verify_flags;
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static uintptr_t _verify_oop_mask;
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static uintptr_t _verify_oop_bits;
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public:
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static void calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) PRODUCT_RETURN;
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// Known classes in the VM
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static Klass* boolArrayKlassObj() { return typeArrayKlassObj(T_BOOLEAN); }
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static Klass* byteArrayKlassObj() { return typeArrayKlassObj(T_BYTE); }
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static Klass* charArrayKlassObj() { return typeArrayKlassObj(T_CHAR); }
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static Klass* intArrayKlassObj() { return typeArrayKlassObj(T_INT); }
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static Klass* shortArrayKlassObj() { return typeArrayKlassObj(T_SHORT); }
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static Klass* longArrayKlassObj() { return typeArrayKlassObj(T_LONG); }
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static Klass* floatArrayKlassObj() { return typeArrayKlassObj(T_FLOAT); }
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static Klass* doubleArrayKlassObj() { return typeArrayKlassObj(T_DOUBLE); }
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static Klass* objectArrayKlassObj() { return _objectArrayKlassObj; }
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static Klass* typeArrayKlassObj(BasicType t) {
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assert((uint)t >= T_BOOLEAN, "range check for type: %s", type2name(t));
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assert((uint)t < T_LONG+1, "range check for type: %s", type2name(t));
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assert(_typeArrayKlassObjs[t] != NULL, "domain check");
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return _typeArrayKlassObjs[t];
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}
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// Known objects in the VM
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static oop int_mirror();
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static oop float_mirror();
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static oop double_mirror();
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static oop byte_mirror();
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static oop bool_mirror();
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static oop char_mirror();
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static oop long_mirror();
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static oop short_mirror();
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static oop void_mirror();
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// Table of primitive type mirrors, excluding T_OBJECT and T_ARRAY
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// but including T_VOID, hence the index including T_VOID
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static OopHandle _mirrors[T_VOID+1];
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static oop java_mirror(BasicType t);
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static void replace_mirror(BasicType t, oop obj);
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static oop main_thread_group();
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static void set_main_thread_group(oop group);
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static oop system_thread_group();
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static void set_system_thread_group(oop group);
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static objArrayOop the_empty_class_array ();
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static oop the_null_string();
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static oop the_min_jint_string();
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static oop null_ptr_exception_instance();
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static oop arithmetic_exception_instance();
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static oop virtual_machine_error_instance();
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static oop vm_exception() { return virtual_machine_error_instance(); }
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static Array<Klass*>* the_array_interfaces_array() { return _the_array_interfaces_array; }
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static Method* finalizer_register_method() { return _finalizer_register_cache->get_method(); }
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static Method* loader_addClass_method() { return _loader_addClass_cache->get_method(); }
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static Method* throw_illegal_access_error() { return _throw_illegal_access_error_cache->get_method(); }
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static Method* throw_no_such_method_error() { return _throw_no_such_method_error_cache->get_method(); }
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static Method* do_stack_walk_method() { return _do_stack_walk_cache->get_method(); }
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static oop the_null_sentinel();
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static address the_null_sentinel_addr() { return (address) &_the_null_sentinel; }
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// Function to initialize these
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static void initialize_known_methods(TRAPS);
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static void create_preallocated_out_of_memory_errors(TRAPS);
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// Reference pending list manipulation. Access is protected by
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// Heap_lock. The getter, setter and predicate require the caller
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// owns the lock. Swap is used by parallel non-concurrent reference
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// processing threads, where some higher level controller owns
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// Heap_lock, so requires the lock is locked, but not necessarily by
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// the current thread.
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static oop reference_pending_list();
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static void clear_reference_pending_list();
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static bool has_reference_pending_list();
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static oop swap_reference_pending_list(oop list);
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static Array<int>* the_empty_int_array() { return _the_empty_int_array; }
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static Array<u2>* the_empty_short_array() { return _the_empty_short_array; }
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static Array<Method*>* the_empty_method_array() { return _the_empty_method_array; }
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static Array<Klass*>* the_empty_klass_array() { return _the_empty_klass_array; }
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static Array<InstanceKlass*>* the_empty_instance_klass_array() { return _the_empty_instance_klass_array; }
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// OutOfMemoryError support. Returns an error with the required message. The returned error
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// may or may not have a backtrace. If error has a backtrace then the stack trace is already
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// filled in.
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static oop out_of_memory_error_java_heap();
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static oop out_of_memory_error_c_heap();
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static oop out_of_memory_error_metaspace();
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static oop out_of_memory_error_class_metaspace();
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static oop out_of_memory_error_array_size();
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static oop out_of_memory_error_gc_overhead_limit();
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static oop out_of_memory_error_realloc_objects();
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// Throw default _out_of_memory_error_retry object as it will never propagate out of the VM
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static oop out_of_memory_error_retry();
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static oop delayed_stack_overflow_error_message();
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// The particular choice of collected heap.
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static CollectedHeap* heap() { return _collectedHeap; }
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// Reserve Java heap and determine CompressedOops mode
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static ReservedHeapSpace reserve_heap(size_t heap_size, size_t alignment);
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// Global OopStorages
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static OopStorage* vm_weak();
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static OopStorage* vm_global();
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static void oopstorage_init();
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// Testers
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static bool is_bootstrapping() { return _bootstrapping; }
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static bool is_module_initialized() { return _module_initialized; }
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static bool is_fully_initialized() { return _fully_initialized; }
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static bool on_page_boundary(void* addr);
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static bool should_fill_in_stack_trace(Handle throwable);
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static void check_alignment(uintx size, uintx alignment, const char* name);
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// CDS support
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static void serialize(SerializeClosure* f);
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// Apply "f" to all klasses for basic types (classes not present in
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// SystemDictionary).
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static void basic_type_classes_do(void f(Klass*));
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static void basic_type_classes_do(KlassClosure* closure);
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static void metaspace_pointers_do(MetaspaceClosure* it);
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// Debugging
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enum VERIFY_FLAGS {
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Verify_Threads = 1,
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Verify_Heap = 2,
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Verify_SymbolTable = 4,
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Verify_StringTable = 8,
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Verify_CodeCache = 16,
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Verify_SystemDictionary = 32,
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Verify_ClassLoaderDataGraph = 64,
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Verify_MetaspaceUtils = 128,
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Verify_JNIHandles = 256,
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Verify_CodeCacheOops = 512,
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Verify_ResolvedMethodTable = 1024,
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Verify_All = -1
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};
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static void initialize_verify_flags();
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static bool should_verify_subset(uint subset);
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static bool verify_in_progress() { return _verify_in_progress; }
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static void verify(VerifyOption option, const char* prefix);
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static void verify(const char* prefix) {
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verify(VerifyOption_Default, prefix);
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}
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static void verify() {
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verify("");
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}
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static int verify_count() { return _verify_count; }
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static void print_on(outputStream* st);
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static void print_heap_at_SIGBREAK();
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// Change the number of dummy objects kept reachable by the full gc dummy
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// array; this should trigger relocation in a sliding compaction collector.
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debug_only(static bool release_fullgc_alot_dummy();)
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// The non-oop pattern (see compiledIC.hpp, etc)
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static void* non_oop_word();
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// Oop verification (see MacroAssembler::verify_oop)
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static uintptr_t verify_oop_mask() PRODUCT_RETURN0;
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static uintptr_t verify_oop_bits() PRODUCT_RETURN0;
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static uintptr_t verify_mark_bits() PRODUCT_RETURN0;
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static uintptr_t verify_mark_mask() PRODUCT_RETURN0;
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// Compiler support
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static int base_vtable_size() { return _base_vtable_size; }
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};
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#endif // SHARE_MEMORY_UNIVERSE_HPP
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