author | eosterlund |
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permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1997, 2017, 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_VM_OOPS_OOP_HPP |
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#define SHARE_VM_OOPS_OOP_HPP |
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#include "gc/shared/specialized_oop_closures.hpp" |
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#include "memory/iterator.hpp" |
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#include "memory/memRegion.hpp" |
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#include "oops/metadata.hpp" |
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#include "utilities/macros.hpp" |
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// oopDesc is the top baseclass for objects classes. The {name}Desc classes describe |
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// the format of Java objects so the fields can be accessed from C++. |
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// oopDesc is abstract. |
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// (see oopHierarchy for complete oop class hierarchy) |
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// |
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// no virtual functions allowed |
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extern bool always_do_update_barrier; |
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// Forward declarations. |
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class OopClosure; |
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class ScanClosure; |
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class FastScanClosure; |
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class FilteringClosure; |
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class BarrierSet; |
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class CMSIsAliveClosure; |
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class PSPromotionManager; |
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class ParCompactionManager; |
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class oopDesc { |
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friend class VMStructs; |
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friend class JVMCIVMStructs; |
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private: |
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volatile markOop _mark; |
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union _metadata { |
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Klass* _klass; |
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narrowKlass _compressed_klass; |
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} _metadata; |
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public: |
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markOop mark() const { return _mark; } |
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markOop* mark_addr() const { return (markOop*) &_mark; } |
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void set_mark(volatile markOop m) { _mark = m; } |
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inline void release_set_mark(markOop m); |
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inline markOop cas_set_mark(markOop new_mark, markOop old_mark); |
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// Used only to re-initialize the mark word (e.g., of promoted |
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// objects during a GC) -- requires a valid klass pointer |
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inline void init_mark(); |
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inline Klass* klass() const; |
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inline Klass* klass_or_null() const volatile; |
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inline Klass* klass_or_null_acquire() const volatile; |
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inline Klass** klass_addr(); |
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inline narrowKlass* compressed_klass_addr(); |
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inline void set_klass(Klass* k); |
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inline void release_set_klass(Klass* k); |
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// For klass field compression |
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inline int klass_gap() const; |
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inline void set_klass_gap(int z); |
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// For when the klass pointer is being used as a linked list "next" field. |
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inline void set_klass_to_list_ptr(oop k); |
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inline oop list_ptr_from_klass(); |
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// size of object header, aligned to platform wordSize |
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static int header_size() { return sizeof(oopDesc)/HeapWordSize; } |
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// Returns whether this is an instance of k or an instance of a subclass of k |
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inline bool is_a(Klass* k) const; |
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// Returns the actual oop size of the object |
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inline int size(); |
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// Sometimes (for complicated concurrency-related reasons), it is useful |
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// to be able to figure out the size of an object knowing its klass. |
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inline int size_given_klass(Klass* klass); |
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// type test operations (inlined in oop.inline.hpp) |
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inline bool is_instance() const; |
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inline bool is_array() const; |
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inline bool is_objArray() const; |
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inline bool is_typeArray() const; |
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// type test operations that don't require inclusion of oop.inline.hpp. |
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bool is_instance_noinline() const; |
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bool is_array_noinline() const; |
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bool is_objArray_noinline() const; |
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bool is_typeArray_noinline() const; |
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protected: |
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inline oop as_oop() const { return const_cast<oopDesc*>(this); } |
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// field addresses in oop |
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inline void* field_base(int offset) const; |
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inline jbyte* byte_field_addr(int offset) const; |
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inline jchar* char_field_addr(int offset) const; |
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inline jboolean* bool_field_addr(int offset) const; |
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inline jint* int_field_addr(int offset) const; |
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inline jshort* short_field_addr(int offset) const; |
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inline jlong* long_field_addr(int offset) const; |
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inline jfloat* float_field_addr(int offset) const; |
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inline jdouble* double_field_addr(int offset) const; |
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inline Metadata** metadata_field_addr(int offset) const; |
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public: |
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// Need this as public for garbage collection. |
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template <class T> inline T* obj_field_addr(int offset) const; |
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// Needed for javaClasses |
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inline address* address_field_addr(int offset) const; |
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inline static bool is_null(oop obj) { return obj == NULL; } |
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inline static bool is_null(narrowOop obj) { return obj == 0; } |
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// Decode an oop pointer from a narrowOop if compressed. |
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// These are overloaded for oop and narrowOop as are the other functions |
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// below so that they can be called in template functions. |
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static inline oop decode_heap_oop_not_null(oop v) { return v; } |
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static inline oop decode_heap_oop_not_null(narrowOop v); |
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static inline oop decode_heap_oop(oop v) { return v; } |
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static inline oop decode_heap_oop(narrowOop v); |
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// Encode an oop pointer to a narrow oop. The or_null versions accept |
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// null oop pointer, others do not in order to eliminate the |
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// null checking branches. |
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static inline narrowOop encode_heap_oop_not_null(oop v); |
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static inline narrowOop encode_heap_oop(oop v); |
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// Load an oop out of the Java heap as is without decoding. |
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// Called by GC to check for null before decoding. |
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static inline narrowOop load_heap_oop(narrowOop* p); |
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static inline oop load_heap_oop(oop* p); |
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// Load an oop out of Java heap and decode it to an uncompressed oop. |
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static inline oop load_decode_heap_oop_not_null(narrowOop* p); |
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static inline oop load_decode_heap_oop_not_null(oop* p); |
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static inline oop load_decode_heap_oop(narrowOop* p); |
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static inline oop load_decode_heap_oop(oop* p); |
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// Store already encoded heap oop into the heap. |
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static inline void store_heap_oop(narrowOop* p, narrowOop v); |
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static inline void store_heap_oop(oop* p, oop v); |
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// Encode oop if UseCompressedOops and store into the heap. |
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static inline void encode_store_heap_oop_not_null(narrowOop* p, oop v); |
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static inline void encode_store_heap_oop_not_null(oop* p, oop v); |
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static inline void encode_store_heap_oop(narrowOop* p, oop v); |
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static inline void encode_store_heap_oop(oop* p, oop v); |
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// Access to fields in a instanceOop through these methods. |
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oop obj_field(int offset) const; |
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void obj_field_put(int offset, oop value); |
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void obj_field_put_raw(int offset, oop value); |
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void obj_field_put_volatile(int offset, oop value); |
1 | 185 |
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Metadata* metadata_field(int offset) const; |
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void metadata_field_put(int offset, Metadata* value); |
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Metadata* metadata_field_acquire(int offset) const; |
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void release_metadata_field_put(int offset, Metadata* value); |
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191 |
|
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jbyte byte_field(int offset) const; |
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void byte_field_put(int offset, jbyte contents); |
1 | 194 |
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jchar char_field(int offset) const; |
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void char_field_put(int offset, jchar contents); |
1 | 197 |
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jboolean bool_field(int offset) const; |
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void bool_field_put(int offset, jboolean contents); |
1 | 200 |
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jint int_field(int offset) const; |
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void int_field_put(int offset, jint contents); |
1 | 203 |
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jshort short_field(int offset) const; |
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void short_field_put(int offset, jshort contents); |
1 | 206 |
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jlong long_field(int offset) const; |
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void long_field_put(int offset, jlong contents); |
1 | 209 |
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jfloat float_field(int offset) const; |
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void float_field_put(int offset, jfloat contents); |
1 | 212 |
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jdouble double_field(int offset) const; |
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void double_field_put(int offset, jdouble contents); |
1 | 215 |
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address address_field(int offset) const; |
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void address_field_put(int offset, address contents); |
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218 |
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oop obj_field_acquire(int offset) const; |
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void release_obj_field_put(int offset, oop value); |
1 | 221 |
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jbyte byte_field_acquire(int offset) const; |
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void release_byte_field_put(int offset, jbyte contents); |
1 | 224 |
|
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jchar char_field_acquire(int offset) const; |
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void release_char_field_put(int offset, jchar contents); |
1 | 227 |
|
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jboolean bool_field_acquire(int offset) const; |
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void release_bool_field_put(int offset, jboolean contents); |
1 | 230 |
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jint int_field_acquire(int offset) const; |
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void release_int_field_put(int offset, jint contents); |
1 | 233 |
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jshort short_field_acquire(int offset) const; |
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void release_short_field_put(int offset, jshort contents); |
1 | 236 |
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jlong long_field_acquire(int offset) const; |
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void release_long_field_put(int offset, jlong contents); |
1 | 239 |
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jfloat float_field_acquire(int offset) const; |
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241 |
void release_float_field_put(int offset, jfloat contents); |
1 | 242 |
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jdouble double_field_acquire(int offset) const; |
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void release_double_field_put(int offset, jdouble contents); |
1 | 245 |
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address address_field_acquire(int offset) const; |
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void release_address_field_put(int offset, address contents); |
2534 | 248 |
|
1 | 249 |
// printing functions for VM debugging |
250 |
void print_on(outputStream* st) const; // First level print |
|
251 |
void print_value_on(outputStream* st) const; // Second level print. |
|
252 |
void print_address_on(outputStream* st) const; // Address printing |
|
253 |
||
254 |
// printing on default output stream |
|
255 |
void print(); |
|
256 |
void print_value(); |
|
257 |
void print_address(); |
|
258 |
||
259 |
// return the print strings |
|
260 |
char* print_string(); |
|
261 |
char* print_value_string(); |
|
262 |
||
263 |
// verification operations |
|
264 |
void verify_on(outputStream* st); |
|
265 |
void verify(); |
|
266 |
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267 |
// locking operations |
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inline bool is_locked() const; |
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inline bool is_unlocked() const; |
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inline bool has_bias_pattern() const; |
1 | 271 |
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// asserts and guarantees |
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static bool is_oop(oop obj, bool ignore_mark_word = false); |
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static bool is_oop_or_null(oop obj, bool ignore_mark_word = false); |
1 | 275 |
#ifndef PRODUCT |
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inline bool is_unlocked_oop() const; |
1 | 277 |
#endif |
278 |
||
279 |
// garbage collection |
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inline bool is_gc_marked() const; |
1 | 281 |
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inline bool is_scavengable() const; |
1 | 283 |
|
284 |
// Forward pointer operations for scavenge |
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inline bool is_forwarded() const; |
1 | 286 |
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inline void forward_to(oop p); |
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inline bool cas_forward_to(oop p, markOop compare); |
1 | 289 |
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#if INCLUDE_ALL_GCS |
1 | 291 |
// Like "forward_to", but inserts the forwarding pointer atomically. |
292 |
// Exactly one thread succeeds in inserting the forwarding pointer, and |
|
293 |
// this call returns "NULL" for that thread; any other thread has the |
|
294 |
// value of the forwarding pointer returned and does not modify "this". |
|
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inline oop forward_to_atomic(oop p); |
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#endif // INCLUDE_ALL_GCS |
1 | 297 |
|
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inline oop forwardee() const; |
1 | 299 |
|
300 |
// Age of object during scavenge |
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inline uint age() const; |
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inline void incr_age(); |
1 | 303 |
|
304 |
// mark-sweep support |
|
305 |
void follow_body(int begin, int end); |
|
306 |
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// Garbage Collection support |
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308 |
|
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#if INCLUDE_ALL_GCS |
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310 |
// Parallel Compact |
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inline void pc_follow_contents(ParCompactionManager* cm); |
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inline void pc_update_contents(ParCompactionManager* cm); |
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// Parallel Scavenge |
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inline void ps_push_contents(PSPromotionManager* pm); |
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#endif |
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316 |
|
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317 |
|
1 | 318 |
// iterators, returns size of object |
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#define OOP_ITERATE_DECL(OopClosureType, nv_suffix) \ |
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320 |
inline void oop_iterate(OopClosureType* blk); \ |
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321 |
inline void oop_iterate(OopClosureType* blk, MemRegion mr); // Only in mr. |
1 | 322 |
|
323 |
ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_ITERATE_DECL) |
|
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ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_ITERATE_DECL) |
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325 |
|
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326 |
#define OOP_ITERATE_SIZE_DECL(OopClosureType, nv_suffix) \ |
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inline int oop_iterate_size(OopClosureType* blk); \ |
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328 |
inline int oop_iterate_size(OopClosureType* blk, MemRegion mr); // Only in mr. |
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329 |
|
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330 |
ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_ITERATE_SIZE_DECL) |
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ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_ITERATE_SIZE_DECL) |
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332 |
|
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333 |
|
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#if INCLUDE_ALL_GCS |
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335 |
|
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#define OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \ |
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inline void oop_iterate_backwards(OopClosureType* blk); |
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ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_ITERATE_BACKWARDS_DECL) |
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ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_ITERATE_BACKWARDS_DECL) |
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#endif // INCLUDE_ALL_GCS |
1 | 343 |
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inline int oop_iterate_no_header(OopClosure* bk); |
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inline int oop_iterate_no_header(OopClosure* bk, MemRegion mr); |
1 | 346 |
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// identity hash; returns the identity hash key (computes it if necessary) |
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// NOTE with the introduction of UseBiasedLocking that identity_hash() might reach a |
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// safepoint if called on a biased object. Calling code must be aware of that. |
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inline intptr_t identity_hash(); |
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intptr_t slow_identity_hash(); |
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||
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// Alternate hashing code if string table is rehashed |
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unsigned int new_hash(juint seed); |
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1 | 356 |
// marks are forwarded to stack when object is locked |
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inline bool has_displaced_mark() const; |
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inline markOop displaced_mark() const; |
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inline void set_displaced_mark(markOop m); |
1 | 360 |
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static bool has_klass_gap(); |
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|
1 | 363 |
// for code generation |
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static int mark_offset_in_bytes() { return offset_of(oopDesc, _mark); } |
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static int klass_offset_in_bytes() { return offset_of(oopDesc, _metadata._klass); } |
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static int klass_gap_offset_in_bytes() { |
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assert(has_klass_gap(), "only applicable to compressed klass pointers"); |
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return klass_offset_in_bytes() + sizeof(narrowKlass); |
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} |
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static bool is_archive_object(oop p) NOT_CDS_JAVA_HEAP_RETURN_(false); |
1 | 372 |
}; |
7397 | 373 |
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#endif // SHARE_VM_OOPS_OOP_HPP |