| /* |
| * Copyright (c) 1997, 2016, 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_VM_OOPS_OOP_INLINE_HPP |
| #define SHARE_VM_OOPS_OOP_INLINE_HPP |
| |
| #include "gc/shared/ageTable.hpp" |
| #include "gc/shared/barrierSet.inline.hpp" |
| #include "gc/shared/cardTableModRefBS.hpp" |
| #include "gc/shared/collectedHeap.inline.hpp" |
| #include "gc/shared/genCollectedHeap.hpp" |
| #include "gc/shared/generation.hpp" |
| #include "oops/arrayKlass.hpp" |
| #include "oops/arrayOop.hpp" |
| #include "oops/klass.inline.hpp" |
| #include "oops/markOop.inline.hpp" |
| #include "oops/oop.hpp" |
| #include "runtime/atomic.inline.hpp" |
| #include "runtime/orderAccess.inline.hpp" |
| #include "runtime/os.hpp" |
| #include "utilities/macros.hpp" |
| |
| inline void update_barrier_set(void* p, oop v, bool release = false) { |
| assert(oopDesc::bs() != NULL, "Uninitialized bs in oop!"); |
| oopDesc::bs()->write_ref_field(p, v, release); |
| } |
| |
| template <class T> inline void update_barrier_set_pre(T* p, oop v) { |
| oopDesc::bs()->write_ref_field_pre(p, v); |
| } |
| |
| template <class T> void oop_store(T* p, oop v) { |
| if (always_do_update_barrier) { |
| oop_store((volatile T*)p, v); |
| } else { |
| update_barrier_set_pre(p, v); |
| oopDesc::encode_store_heap_oop(p, v); |
| // always_do_update_barrier == false => |
| // Either we are at a safepoint (in GC) or CMS is not used. In both |
| // cases it's unnecessary to mark the card as dirty with release sematics. |
| update_barrier_set((void*)p, v, false /* release */); // cast away type |
| } |
| } |
| |
| template <class T> void oop_store(volatile T* p, oop v) { |
| update_barrier_set_pre((T*)p, v); // cast away volatile |
| // Used by release_obj_field_put, so use release_store_ptr. |
| oopDesc::release_encode_store_heap_oop(p, v); |
| // When using CMS we must mark the card corresponding to p as dirty |
| // with release sematics to prevent that CMS sees the dirty card but |
| // not the new value v at p due to reordering of the two |
| // stores. Note that CMS has a concurrent precleaning phase, where |
| // it reads the card table while the Java threads are running. |
| update_barrier_set((void*)p, v, true /* release */); // cast away type |
| } |
| |
| // Should replace *addr = oop assignments where addr type depends on UseCompressedOops |
| // (without having to remember the function name this calls). |
| inline void oop_store_raw(HeapWord* addr, oop value) { |
| if (UseCompressedOops) { |
| oopDesc::encode_store_heap_oop((narrowOop*)addr, value); |
| } else { |
| oopDesc::encode_store_heap_oop((oop*)addr, value); |
| } |
| } |
| |
| // Implementation of all inlined member functions defined in oop.hpp |
| // We need a separate file to avoid circular references |
| |
| void oopDesc::release_set_mark(markOop m) { |
| OrderAccess::release_store_ptr(&_mark, m); |
| } |
| |
| markOop oopDesc::cas_set_mark(markOop new_mark, markOop old_mark) { |
| return (markOop) Atomic::cmpxchg_ptr(new_mark, &_mark, old_mark); |
| } |
| |
| void oopDesc::init_mark() { |
| set_mark(markOopDesc::prototype_for_object(this)); |
| } |
| |
| Klass* oopDesc::klass() const { |
| if (UseCompressedClassPointers) { |
| return Klass::decode_klass_not_null(_metadata._compressed_klass); |
| } else { |
| return _metadata._klass; |
| } |
| } |
| |
| Klass* oopDesc::klass_or_null() const volatile { |
| // can be NULL in CMS |
| if (UseCompressedClassPointers) { |
| return Klass::decode_klass(_metadata._compressed_klass); |
| } else { |
| return _metadata._klass; |
| } |
| } |
| |
| Klass** oopDesc::klass_addr() { |
| // Only used internally and with CMS and will not work with |
| // UseCompressedOops |
| assert(!UseCompressedClassPointers, "only supported with uncompressed klass pointers"); |
| return (Klass**) &_metadata._klass; |
| } |
| |
| narrowKlass* oopDesc::compressed_klass_addr() { |
| assert(UseCompressedClassPointers, "only called by compressed klass pointers"); |
| return &_metadata._compressed_klass; |
| } |
| |
| void oopDesc::set_klass(Klass* k) { |
| // since klasses are promoted no store check is needed |
| assert(Universe::is_bootstrapping() || k != NULL, "must be a real Klass*"); |
| assert(Universe::is_bootstrapping() || k->is_klass(), "not a Klass*"); |
| if (UseCompressedClassPointers) { |
| *compressed_klass_addr() = Klass::encode_klass_not_null(k); |
| } else { |
| *klass_addr() = k; |
| } |
| } |
| |
| int oopDesc::klass_gap() const { |
| return *(int*)(((intptr_t)this) + klass_gap_offset_in_bytes()); |
| } |
| |
| void oopDesc::set_klass_gap(int v) { |
| if (UseCompressedClassPointers) { |
| *(int*)(((intptr_t)this) + klass_gap_offset_in_bytes()) = v; |
| } |
| } |
| |
| void oopDesc::set_klass_to_list_ptr(oop k) { |
| // This is only to be used during GC, for from-space objects, so no |
| // barrier is needed. |
| if (UseCompressedClassPointers) { |
| _metadata._compressed_klass = (narrowKlass)encode_heap_oop(k); // may be null (parnew overflow handling) |
| } else { |
| _metadata._klass = (Klass*)(address)k; |
| } |
| } |
| |
| oop oopDesc::list_ptr_from_klass() { |
| // This is only to be used during GC, for from-space objects. |
| if (UseCompressedClassPointers) { |
| return decode_heap_oop((narrowOop)_metadata._compressed_klass); |
| } else { |
| // Special case for GC |
| return (oop)(address)_metadata._klass; |
| } |
| } |
| |
| bool oopDesc::is_a(Klass* k) const { |
| return klass()->is_subtype_of(k); |
| } |
| |
| int oopDesc::size() { |
| return size_given_klass(klass()); |
| } |
| |
| int oopDesc::size_given_klass(Klass* klass) { |
| int lh = klass->layout_helper(); |
| int s; |
| |
| // lh is now a value computed at class initialization that may hint |
| // at the size. For instances, this is positive and equal to the |
| // size. For arrays, this is negative and provides log2 of the |
| // array element size. For other oops, it is zero and thus requires |
| // a virtual call. |
| // |
| // We go to all this trouble because the size computation is at the |
| // heart of phase 2 of mark-compaction, and called for every object, |
| // alive or dead. So the speed here is equal in importance to the |
| // speed of allocation. |
| |
| if (lh > Klass::_lh_neutral_value) { |
| if (!Klass::layout_helper_needs_slow_path(lh)) { |
| s = lh >> LogHeapWordSize; // deliver size scaled by wordSize |
| } else { |
| s = klass->oop_size(this); |
| } |
| } else if (lh <= Klass::_lh_neutral_value) { |
| // The most common case is instances; fall through if so. |
| if (lh < Klass::_lh_neutral_value) { |
| // Second most common case is arrays. We have to fetch the |
| // length of the array, shift (multiply) it appropriately, |
| // up to wordSize, add the header, and align to object size. |
| size_t size_in_bytes; |
| #ifdef _M_IA64 |
| // The Windows Itanium Aug 2002 SDK hoists this load above |
| // the check for s < 0. An oop at the end of the heap will |
| // cause an access violation if this load is performed on a non |
| // array oop. Making the reference volatile prohibits this. |
| // (%%% please explain by what magic the length is actually fetched!) |
| volatile int *array_length; |
| array_length = (volatile int *)( (intptr_t)this + |
| arrayOopDesc::length_offset_in_bytes() ); |
| assert(array_length > 0, "Integer arithmetic problem somewhere"); |
| // Put into size_t to avoid overflow. |
| size_in_bytes = (size_t) array_length; |
| size_in_bytes = size_in_bytes << Klass::layout_helper_log2_element_size(lh); |
| #else |
| size_t array_length = (size_t) ((arrayOop)this)->length(); |
| size_in_bytes = array_length << Klass::layout_helper_log2_element_size(lh); |
| #endif |
| size_in_bytes += Klass::layout_helper_header_size(lh); |
| |
| // This code could be simplified, but by keeping array_header_in_bytes |
| // in units of bytes and doing it this way we can round up just once, |
| // skipping the intermediate round to HeapWordSize. Cast the result |
| // of round_to to size_t to guarantee unsigned division == right shift. |
| s = (int)((size_t)round_to(size_in_bytes, MinObjAlignmentInBytes) / |
| HeapWordSize); |
| |
| // ParNew (used by CMS), UseParallelGC and UseG1GC can change the length field |
| // of an "old copy" of an object array in the young gen so it indicates |
| // the grey portion of an already copied array. This will cause the first |
| // disjunct below to fail if the two comparands are computed across such |
| // a concurrent change. |
| // ParNew also runs with promotion labs (which look like int |
| // filler arrays) which are subject to changing their declared size |
| // when finally retiring a PLAB; this also can cause the first disjunct |
| // to fail for another worker thread that is concurrently walking the block |
| // offset table. Both these invariant failures are benign for their |
| // current uses; we relax the assertion checking to cover these two cases below: |
| // is_objArray() && is_forwarded() // covers first scenario above |
| // || is_typeArray() // covers second scenario above |
| // If and when UseParallelGC uses the same obj array oop stealing/chunking |
| // technique, we will need to suitably modify the assertion. |
| assert((s == klass->oop_size(this)) || |
| (Universe::heap()->is_gc_active() && |
| ((is_typeArray() && UseConcMarkSweepGC) || |
| (is_objArray() && is_forwarded() && (UseConcMarkSweepGC || UseParallelGC || UseG1GC)))), |
| "wrong array object size"); |
| } else { |
| // Must be zero, so bite the bullet and take the virtual call. |
| s = klass->oop_size(this); |
| } |
| } |
| |
| assert(s % MinObjAlignment == 0, "alignment check"); |
| assert(s > 0, "Bad size calculated"); |
| return s; |
| } |
| |
| bool oopDesc::is_instance() const { return klass()->is_instance_klass(); } |
| bool oopDesc::is_array() const { return klass()->is_array_klass(); } |
| bool oopDesc::is_objArray() const { return klass()->is_objArray_klass(); } |
| bool oopDesc::is_typeArray() const { return klass()->is_typeArray_klass(); } |
| |
| void* oopDesc::field_base(int offset) const { return (void*)&((char*)this)[offset]; } |
| |
| jbyte* oopDesc::byte_field_addr(int offset) const { return (jbyte*) field_base(offset); } |
| jchar* oopDesc::char_field_addr(int offset) const { return (jchar*) field_base(offset); } |
| jboolean* oopDesc::bool_field_addr(int offset) const { return (jboolean*) field_base(offset); } |
| jint* oopDesc::int_field_addr(int offset) const { return (jint*) field_base(offset); } |
| jshort* oopDesc::short_field_addr(int offset) const { return (jshort*) field_base(offset); } |
| jlong* oopDesc::long_field_addr(int offset) const { return (jlong*) field_base(offset); } |
| jfloat* oopDesc::float_field_addr(int offset) const { return (jfloat*) field_base(offset); } |
| jdouble* oopDesc::double_field_addr(int offset) const { return (jdouble*) field_base(offset); } |
| Metadata** oopDesc::metadata_field_addr(int offset) const { return (Metadata**)field_base(offset); } |
| |
| template <class T> T* oopDesc::obj_field_addr(int offset) const { return (T*) field_base(offset); } |
| address* oopDesc::address_field_addr(int offset) const { return (address*) field_base(offset); } |
| |
| |
| // Functions for getting and setting oops within instance objects. |
| // If the oops are compressed, the type passed to these overloaded functions |
| // is narrowOop. All functions are overloaded so they can be called by |
| // template functions without conditionals (the compiler instantiates via |
| // the right type and inlines the appopriate code). |
| |
| // Algorithm for encoding and decoding oops from 64 bit pointers to 32 bit |
| // offset from the heap base. Saving the check for null can save instructions |
| // in inner GC loops so these are separated. |
| |
| inline bool check_obj_alignment(oop obj) { |
| return (cast_from_oop<intptr_t>(obj) & MinObjAlignmentInBytesMask) == 0; |
| } |
| |
| oop oopDesc::decode_heap_oop_not_null(narrowOop v) { |
| assert(!is_null(v), "narrow oop value can never be zero"); |
| address base = Universe::narrow_oop_base(); |
| int shift = Universe::narrow_oop_shift(); |
| oop result = (oop)(void*)((uintptr_t)base + ((uintptr_t)v << shift)); |
| assert(check_obj_alignment(result), "address not aligned: " INTPTR_FORMAT, p2i((void*) result)); |
| return result; |
| } |
| |
| oop oopDesc::decode_heap_oop(narrowOop v) { |
| return is_null(v) ? (oop)NULL : decode_heap_oop_not_null(v); |
| } |
| |
| narrowOop oopDesc::encode_heap_oop_not_null(oop v) { |
| assert(!is_null(v), "oop value can never be zero"); |
| assert(check_obj_alignment(v), "Address not aligned"); |
| assert(Universe::heap()->is_in_reserved(v), "Address not in heap"); |
| address base = Universe::narrow_oop_base(); |
| int shift = Universe::narrow_oop_shift(); |
| uint64_t pd = (uint64_t)(pointer_delta((void*)v, (void*)base, 1)); |
| assert(OopEncodingHeapMax > pd, "change encoding max if new encoding"); |
| uint64_t result = pd >> shift; |
| assert((result & CONST64(0xffffffff00000000)) == 0, "narrow oop overflow"); |
| assert(decode_heap_oop(result) == v, "reversibility"); |
| return (narrowOop)result; |
| } |
| |
| narrowOop oopDesc::encode_heap_oop(oop v) { |
| return (is_null(v)) ? (narrowOop)0 : encode_heap_oop_not_null(v); |
| } |
| |
| // Load and decode an oop out of the Java heap into a wide oop. |
| oop oopDesc::load_decode_heap_oop_not_null(narrowOop* p) { |
| return decode_heap_oop_not_null(*p); |
| } |
| |
| // Load and decode an oop out of the heap accepting null |
| oop oopDesc::load_decode_heap_oop(narrowOop* p) { |
| return decode_heap_oop(*p); |
| } |
| |
| // Encode and store a heap oop. |
| void oopDesc::encode_store_heap_oop_not_null(narrowOop* p, oop v) { |
| *p = encode_heap_oop_not_null(v); |
| } |
| |
| // Encode and store a heap oop allowing for null. |
| void oopDesc::encode_store_heap_oop(narrowOop* p, oop v) { |
| *p = encode_heap_oop(v); |
| } |
| |
| // Store heap oop as is for volatile fields. |
| void oopDesc::release_store_heap_oop(volatile oop* p, oop v) { |
| OrderAccess::release_store_ptr(p, v); |
| } |
| void oopDesc::release_store_heap_oop(volatile narrowOop* p, narrowOop v) { |
| OrderAccess::release_store(p, v); |
| } |
| |
| void oopDesc::release_encode_store_heap_oop_not_null(volatile narrowOop* p, oop v) { |
| // heap oop is not pointer sized. |
| OrderAccess::release_store(p, encode_heap_oop_not_null(v)); |
| } |
| void oopDesc::release_encode_store_heap_oop_not_null(volatile oop* p, oop v) { |
| OrderAccess::release_store_ptr(p, v); |
| } |
| |
| void oopDesc::release_encode_store_heap_oop(volatile oop* p, oop v) { |
| OrderAccess::release_store_ptr(p, v); |
| } |
| void oopDesc::release_encode_store_heap_oop(volatile narrowOop* p, oop v) { |
| OrderAccess::release_store(p, encode_heap_oop(v)); |
| } |
| |
| // These functions are only used to exchange oop fields in instances, |
| // not headers. |
| oop oopDesc::atomic_exchange_oop(oop exchange_value, volatile HeapWord *dest) { |
| if (UseCompressedOops) { |
| // encode exchange value from oop to T |
| narrowOop val = encode_heap_oop(exchange_value); |
| narrowOop old = (narrowOop)Atomic::xchg(val, (narrowOop*)dest); |
| // decode old from T to oop |
| return decode_heap_oop(old); |
| } else { |
| return (oop)Atomic::xchg_ptr(exchange_value, (oop*)dest); |
| } |
| } |
| |
| oop oopDesc::atomic_compare_exchange_oop(oop exchange_value, |
| volatile HeapWord *dest, |
| oop compare_value, |
| bool prebarrier) { |
| if (UseCompressedOops) { |
| if (prebarrier) { |
| update_barrier_set_pre((narrowOop*)dest, exchange_value); |
| } |
| // encode exchange and compare value from oop to T |
| narrowOop val = encode_heap_oop(exchange_value); |
| narrowOop cmp = encode_heap_oop(compare_value); |
| |
| narrowOop old = (narrowOop) Atomic::cmpxchg(val, (narrowOop*)dest, cmp); |
| // decode old from T to oop |
| return decode_heap_oop(old); |
| } else { |
| if (prebarrier) { |
| update_barrier_set_pre((oop*)dest, exchange_value); |
| } |
| return (oop)Atomic::cmpxchg_ptr(exchange_value, (oop*)dest, compare_value); |
| } |
| } |
| |
| // In order to put or get a field out of an instance, must first check |
| // if the field has been compressed and uncompress it. |
| oop oopDesc::obj_field(int offset) const { |
| return UseCompressedOops ? |
| load_decode_heap_oop(obj_field_addr<narrowOop>(offset)) : |
| load_decode_heap_oop(obj_field_addr<oop>(offset)); |
| } |
| |
| void oopDesc::obj_field_put(int offset, oop value) { |
| UseCompressedOops ? oop_store(obj_field_addr<narrowOop>(offset), value) : |
| oop_store(obj_field_addr<oop>(offset), value); |
| } |
| |
| void oopDesc::obj_field_put_raw(int offset, oop value) { |
| UseCompressedOops ? |
| encode_store_heap_oop(obj_field_addr<narrowOop>(offset), value) : |
| encode_store_heap_oop(obj_field_addr<oop>(offset), value); |
| } |
| void oopDesc::obj_field_put_volatile(int offset, oop value) { |
| OrderAccess::release(); |
| obj_field_put(offset, value); |
| OrderAccess::fence(); |
| } |
| |
| Metadata* oopDesc::metadata_field(int offset) const { return *metadata_field_addr(offset); } |
| void oopDesc::metadata_field_put(int offset, Metadata* value) { *metadata_field_addr(offset) = value; } |
| |
| jbyte oopDesc::byte_field(int offset) const { return (jbyte) *byte_field_addr(offset); } |
| void oopDesc::byte_field_put(int offset, jbyte contents) { *byte_field_addr(offset) = (jint) contents; } |
| |
| jchar oopDesc::char_field(int offset) const { return (jchar) *char_field_addr(offset); } |
| void oopDesc::char_field_put(int offset, jchar contents) { *char_field_addr(offset) = (jint) contents; } |
| |
| jboolean oopDesc::bool_field(int offset) const { return (jboolean) *bool_field_addr(offset); } |
| void oopDesc::bool_field_put(int offset, jboolean contents) { *bool_field_addr(offset) = (((jint) contents) & 1); } |
| |
| jint oopDesc::int_field(int offset) const { return *int_field_addr(offset); } |
| void oopDesc::int_field_put(int offset, jint contents) { *int_field_addr(offset) = contents; } |
| |
| jshort oopDesc::short_field(int offset) const { return (jshort) *short_field_addr(offset); } |
| void oopDesc::short_field_put(int offset, jshort contents) { *short_field_addr(offset) = (jint) contents;} |
| |
| jlong oopDesc::long_field(int offset) const { return *long_field_addr(offset); } |
| void oopDesc::long_field_put(int offset, jlong contents) { *long_field_addr(offset) = contents; } |
| |
| jfloat oopDesc::float_field(int offset) const { return *float_field_addr(offset); } |
| void oopDesc::float_field_put(int offset, jfloat contents) { *float_field_addr(offset) = contents; } |
| |
| jdouble oopDesc::double_field(int offset) const { return *double_field_addr(offset); } |
| void oopDesc::double_field_put(int offset, jdouble contents) { *double_field_addr(offset) = contents; } |
| |
| address oopDesc::address_field(int offset) const { return *address_field_addr(offset); } |
| void oopDesc::address_field_put(int offset, address contents) { *address_field_addr(offset) = contents; } |
| |
| oop oopDesc::obj_field_acquire(int offset) const { |
| return UseCompressedOops ? |
| decode_heap_oop((narrowOop) |
| OrderAccess::load_acquire(obj_field_addr<narrowOop>(offset))) |
| : decode_heap_oop((oop) |
| OrderAccess::load_ptr_acquire(obj_field_addr<oop>(offset))); |
| } |
| void oopDesc::release_obj_field_put(int offset, oop value) { |
| UseCompressedOops ? |
| oop_store((volatile narrowOop*)obj_field_addr<narrowOop>(offset), value) : |
| oop_store((volatile oop*) obj_field_addr<oop>(offset), value); |
| } |
| |
| jbyte oopDesc::byte_field_acquire(int offset) const { return OrderAccess::load_acquire(byte_field_addr(offset)); } |
| void oopDesc::release_byte_field_put(int offset, jbyte contents) { OrderAccess::release_store(byte_field_addr(offset), contents); } |
| |
| jchar oopDesc::char_field_acquire(int offset) const { return OrderAccess::load_acquire(char_field_addr(offset)); } |
| void oopDesc::release_char_field_put(int offset, jchar contents) { OrderAccess::release_store(char_field_addr(offset), contents); } |
| |
| jboolean oopDesc::bool_field_acquire(int offset) const { return OrderAccess::load_acquire(bool_field_addr(offset)); } |
| void oopDesc::release_bool_field_put(int offset, jboolean contents) { OrderAccess::release_store(bool_field_addr(offset), (contents & 1)); } |
| |
| jint oopDesc::int_field_acquire(int offset) const { return OrderAccess::load_acquire(int_field_addr(offset)); } |
| void oopDesc::release_int_field_put(int offset, jint contents) { OrderAccess::release_store(int_field_addr(offset), contents); } |
| |
| jshort oopDesc::short_field_acquire(int offset) const { return (jshort)OrderAccess::load_acquire(short_field_addr(offset)); } |
| void oopDesc::release_short_field_put(int offset, jshort contents) { OrderAccess::release_store(short_field_addr(offset), contents); } |
| |
| jlong oopDesc::long_field_acquire(int offset) const { return OrderAccess::load_acquire(long_field_addr(offset)); } |
| void oopDesc::release_long_field_put(int offset, jlong contents) { OrderAccess::release_store(long_field_addr(offset), contents); } |
| |
| jfloat oopDesc::float_field_acquire(int offset) const { return OrderAccess::load_acquire(float_field_addr(offset)); } |
| void oopDesc::release_float_field_put(int offset, jfloat contents) { OrderAccess::release_store(float_field_addr(offset), contents); } |
| |
| jdouble oopDesc::double_field_acquire(int offset) const { return OrderAccess::load_acquire(double_field_addr(offset)); } |
| void oopDesc::release_double_field_put(int offset, jdouble contents) { OrderAccess::release_store(double_field_addr(offset), contents); } |
| |
| address oopDesc::address_field_acquire(int offset) const { return (address) OrderAccess::load_ptr_acquire(address_field_addr(offset)); } |
| void oopDesc::release_address_field_put(int offset, address contents) { OrderAccess::release_store_ptr(address_field_addr(offset), contents); } |
| |
| bool oopDesc::is_locked() const { |
| return mark()->is_locked(); |
| } |
| |
| bool oopDesc::is_unlocked() const { |
| return mark()->is_unlocked(); |
| } |
| |
| bool oopDesc::has_bias_pattern() const { |
| return mark()->has_bias_pattern(); |
| } |
| |
| // used only for asserts |
| bool oopDesc::is_oop(bool ignore_mark_word) const { |
| oop obj = (oop) this; |
| if (!check_obj_alignment(obj)) return false; |
| if (!Universe::heap()->is_in_reserved(obj)) return false; |
| // obj is aligned and accessible in heap |
| if (Universe::heap()->is_in_reserved(obj->klass_or_null())) return false; |
| |
| // Header verification: the mark is typically non-NULL. If we're |
| // at a safepoint, it must not be null. |
| // Outside of a safepoint, the header could be changing (for example, |
| // another thread could be inflating a lock on this object). |
| if (ignore_mark_word) { |
| return true; |
| } |
| if (mark() != NULL) { |
| return true; |
| } |
| return !SafepointSynchronize::is_at_safepoint(); |
| } |
| |
| |
| // used only for asserts |
| bool oopDesc::is_oop_or_null(bool ignore_mark_word) const { |
| return this == NULL ? true : is_oop(ignore_mark_word); |
| } |
| |
| #ifndef PRODUCT |
| // used only for asserts |
| bool oopDesc::is_unlocked_oop() const { |
| if (!Universe::heap()->is_in_reserved(this)) return false; |
| return mark()->is_unlocked(); |
| } |
| #endif // PRODUCT |
| |
| // Used only for markSweep, scavenging |
| bool oopDesc::is_gc_marked() const { |
| return mark()->is_marked(); |
| } |
| |
| bool oopDesc::is_scavengable() const { |
| return Universe::heap()->is_scavengable(this); |
| } |
| |
| // Used by scavengers |
| bool oopDesc::is_forwarded() const { |
| // The extra heap check is needed since the obj might be locked, in which case the |
| // mark would point to a stack location and have the sentinel bit cleared |
| return mark()->is_marked(); |
| } |
| |
| // Used by scavengers |
| void oopDesc::forward_to(oop p) { |
| assert(check_obj_alignment(p), |
| "forwarding to something not aligned"); |
| assert(Universe::heap()->is_in_reserved(p), |
| "forwarding to something not in heap"); |
| markOop m = markOopDesc::encode_pointer_as_mark(p); |
| assert(m->decode_pointer() == p, "encoding must be reversable"); |
| set_mark(m); |
| } |
| |
| // Used by parallel scavengers |
| bool oopDesc::cas_forward_to(oop p, markOop compare) { |
| assert(check_obj_alignment(p), |
| "forwarding to something not aligned"); |
| assert(Universe::heap()->is_in_reserved(p), |
| "forwarding to something not in heap"); |
| markOop m = markOopDesc::encode_pointer_as_mark(p); |
| assert(m->decode_pointer() == p, "encoding must be reversable"); |
| return cas_set_mark(m, compare) == compare; |
| } |
| |
| #if INCLUDE_ALL_GCS |
| oop oopDesc::forward_to_atomic(oop p) { |
| markOop oldMark = mark(); |
| markOop forwardPtrMark = markOopDesc::encode_pointer_as_mark(p); |
| markOop curMark; |
| |
| assert(forwardPtrMark->decode_pointer() == p, "encoding must be reversable"); |
| assert(sizeof(markOop) == sizeof(intptr_t), "CAS below requires this."); |
| |
| while (!oldMark->is_marked()) { |
| curMark = (markOop)Atomic::cmpxchg_ptr(forwardPtrMark, &_mark, oldMark); |
| assert(is_forwarded(), "object should have been forwarded"); |
| if (curMark == oldMark) { |
| return NULL; |
| } |
| // If the CAS was unsuccessful then curMark->is_marked() |
| // should return true as another thread has CAS'd in another |
| // forwarding pointer. |
| oldMark = curMark; |
| } |
| return forwardee(); |
| } |
| #endif |
| |
| // Note that the forwardee is not the same thing as the displaced_mark. |
| // The forwardee is used when copying during scavenge and mark-sweep. |
| // It does need to clear the low two locking- and GC-related bits. |
| oop oopDesc::forwardee() const { |
| return (oop) mark()->decode_pointer(); |
| } |
| |
| // The following method needs to be MT safe. |
| uint oopDesc::age() const { |
| assert(!is_forwarded(), "Attempt to read age from forwarded mark"); |
| if (has_displaced_mark()) { |
| return displaced_mark()->age(); |
| } else { |
| return mark()->age(); |
| } |
| } |
| |
| void oopDesc::incr_age() { |
| assert(!is_forwarded(), "Attempt to increment age of forwarded mark"); |
| if (has_displaced_mark()) { |
| set_displaced_mark(displaced_mark()->incr_age()); |
| } else { |
| set_mark(mark()->incr_age()); |
| } |
| } |
| |
| int oopDesc::ms_adjust_pointers() { |
| debug_only(int check_size = size()); |
| int s = klass()->oop_ms_adjust_pointers(this); |
| assert(s == check_size, "should be the same"); |
| return s; |
| } |
| |
| #if INCLUDE_ALL_GCS |
| void oopDesc::pc_follow_contents(ParCompactionManager* cm) { |
| klass()->oop_pc_follow_contents(this, cm); |
| } |
| |
| void oopDesc::pc_update_contents(ParCompactionManager* cm) { |
| Klass* k = klass(); |
| if (!k->is_typeArray_klass()) { |
| // It might contain oops beyond the header, so take the virtual call. |
| k->oop_pc_update_pointers(this, cm); |
| } |
| // Else skip it. The TypeArrayKlass in the header never needs scavenging. |
| } |
| |
| void oopDesc::ps_push_contents(PSPromotionManager* pm) { |
| Klass* k = klass(); |
| if (!k->is_typeArray_klass()) { |
| // It might contain oops beyond the header, so take the virtual call. |
| k->oop_ps_push_contents(this, pm); |
| } |
| // Else skip it. The TypeArrayKlass in the header never needs scavenging. |
| } |
| #endif // INCLUDE_ALL_GCS |
| |
| #define OOP_ITERATE_DEFN(OopClosureType, nv_suffix) \ |
| \ |
| void oopDesc::oop_iterate(OopClosureType* blk) { \ |
| klass()->oop_oop_iterate##nv_suffix(this, blk); \ |
| } \ |
| \ |
| void oopDesc::oop_iterate(OopClosureType* blk, MemRegion mr) { \ |
| klass()->oop_oop_iterate_bounded##nv_suffix(this, blk, mr); \ |
| } |
| |
| #define OOP_ITERATE_SIZE_DEFN(OopClosureType, nv_suffix) \ |
| \ |
| int oopDesc::oop_iterate_size(OopClosureType* blk) { \ |
| Klass* k = klass(); \ |
| int size = size_given_klass(k); \ |
| k->oop_oop_iterate##nv_suffix(this, blk); \ |
| return size; \ |
| } \ |
| \ |
| int oopDesc::oop_iterate_size(OopClosureType* blk, MemRegion mr) { \ |
| Klass* k = klass(); \ |
| int size = size_given_klass(k); \ |
| k->oop_oop_iterate_bounded##nv_suffix(this, blk, mr); \ |
| return size; \ |
| } |
| |
| int oopDesc::oop_iterate_no_header(OopClosure* blk) { |
| // The NoHeaderExtendedOopClosure wraps the OopClosure and proxies all |
| // the do_oop calls, but turns off all other features in ExtendedOopClosure. |
| NoHeaderExtendedOopClosure cl(blk); |
| return oop_iterate_size(&cl); |
| } |
| |
| int oopDesc::oop_iterate_no_header(OopClosure* blk, MemRegion mr) { |
| NoHeaderExtendedOopClosure cl(blk); |
| return oop_iterate_size(&cl, mr); |
| } |
| |
| #if INCLUDE_ALL_GCS |
| #define OOP_ITERATE_BACKWARDS_DEFN(OopClosureType, nv_suffix) \ |
| \ |
| inline void oopDesc::oop_iterate_backwards(OopClosureType* blk) { \ |
| klass()->oop_oop_iterate_backwards##nv_suffix(this, blk); \ |
| } |
| #else |
| #define OOP_ITERATE_BACKWARDS_DEFN(OopClosureType, nv_suffix) |
| #endif // INCLUDE_ALL_GCS |
| |
| #define ALL_OOPDESC_OOP_ITERATE(OopClosureType, nv_suffix) \ |
| OOP_ITERATE_DEFN(OopClosureType, nv_suffix) \ |
| OOP_ITERATE_SIZE_DEFN(OopClosureType, nv_suffix) \ |
| OOP_ITERATE_BACKWARDS_DEFN(OopClosureType, nv_suffix) |
| |
| ALL_OOP_OOP_ITERATE_CLOSURES_1(ALL_OOPDESC_OOP_ITERATE) |
| ALL_OOP_OOP_ITERATE_CLOSURES_2(ALL_OOPDESC_OOP_ITERATE) |
| |
| intptr_t oopDesc::identity_hash() { |
| // Fast case; if the object is unlocked and the hash value is set, no locking is needed |
| // Note: The mark must be read into local variable to avoid concurrent updates. |
| markOop mrk = mark(); |
| if (mrk->is_unlocked() && !mrk->has_no_hash()) { |
| return mrk->hash(); |
| } else if (mrk->is_marked()) { |
| return mrk->hash(); |
| } else { |
| return slow_identity_hash(); |
| } |
| } |
| |
| bool oopDesc::has_displaced_mark() const { |
| return mark()->has_displaced_mark_helper(); |
| } |
| |
| markOop oopDesc::displaced_mark() const { |
| return mark()->displaced_mark_helper(); |
| } |
| |
| void oopDesc::set_displaced_mark(markOop m) { |
| mark()->set_displaced_mark_helper(m); |
| } |
| |
| #endif // SHARE_VM_OOPS_OOP_INLINE_HPP |