jdk8-mips64-public/hotspot: src/share/vm/oops/oop.inline.hpp@8e47bac5643a (annotated)

src/share/vm/oops/oop.inline.hpp@8e47bac5643a (annotated)

src/share/vm/oops/oop.inline.hpp

Tue, 09 Oct 2012 10:11:38 +0200

author: roland
date: Tue, 09 Oct 2012 10:11:38 +0200
changeset 4159: 8e47bac5643a
parent 4129: 22b8d3d181d9
child 4523: 10d5f25a7c67
child 4542: db9981fd3124
permissions: -rw-r--r--

7054512: Compress class pointers after perm gen removal
Summary: support of compress class pointers in the compilers.
Reviewed-by: kvn, twisti

 /*
  * Copyright (c) 1997, 2012, 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_implementation/shared/ageTable.hpp"
 #include "gc_implementation/shared/markSweep.inline.hpp"
 #include "gc_interface/collectedHeap.inline.hpp"
 #include "memory/barrierSet.inline.hpp"
 #include "memory/cardTableModRefBS.hpp"
 #include "memory/genCollectedHeap.hpp"
 #include "memory/generation.hpp"
 #include "memory/specialized_oop_closures.hpp"
 #include "oops/arrayKlass.hpp"
 #include "oops/arrayOop.hpp"
 #include "oops/klass.hpp"
 #include "oops/markOop.inline.hpp"
 #include "oops/oop.hpp"
 #include "runtime/atomic.hpp"
 #include "runtime/os.hpp"
 #ifdef TARGET_ARCH_x86
 # include "bytes_x86.hpp"
 #endif
 #ifdef TARGET_ARCH_sparc
 # include "bytes_sparc.hpp"
 #endif
 #ifdef TARGET_ARCH_zero
 # include "bytes_zero.hpp"
 #endif
 #ifdef TARGET_ARCH_arm
 # include "bytes_arm.hpp"
 #endif
 #ifdef TARGET_ARCH_ppc
 # include "bytes_ppc.hpp"
 #endif
 // Implementation of all inlined member functions defined in oop.hpp
 // We need a separate file to avoid circular references
 inline void oopDesc::release_set_mark(markOop m) {
   OrderAccess::release_store_ptr(&_mark, m);
 }
 inline markOop oopDesc::cas_set_mark(markOop new_mark, markOop old_mark) {
   return (markOop) Atomic::cmpxchg_ptr(new_mark, &_mark, old_mark);
 }
 inline Klass* oopDesc::klass() const {
   if (UseCompressedKlassPointers) {
     return decode_klass_not_null(_metadata._compressed_klass);
   } else {
     return _metadata._klass;
   }
 }
 inline Klass* oopDesc::klass_or_null() const volatile {
   // can be NULL in CMS
   if (UseCompressedKlassPointers) {
     return decode_klass(_metadata._compressed_klass);
   } else {
     return _metadata._klass;
   }
 }
 inline int oopDesc::klass_gap_offset_in_bytes() {
   assert(UseCompressedKlassPointers, "only applicable to compressed klass pointers");
   return oopDesc::klass_offset_in_bytes() + sizeof(narrowOop);
 }
 inline Klass** oopDesc::klass_addr() {
   // Only used internally and with CMS and will not work with
   // UseCompressedOops
   assert(!UseCompressedKlassPointers, "only supported with uncompressed klass pointers");
   return (Klass**) &_metadata._klass;
 }
 inline narrowOop* oopDesc::compressed_klass_addr() {
   assert(UseCompressedKlassPointers, "only called by compressed klass pointers");
   return (narrowOop*) &_metadata._compressed_klass;
 }
 inline 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 (UseCompressedKlassPointers) {
     *compressed_klass_addr() = encode_klass_not_null(k);
   } else {
     *klass_addr() = k;
   }
 }
 inline int oopDesc::klass_gap() const {
   return *(int*)(((intptr_t)this) + klass_gap_offset_in_bytes());
 }
 inline void oopDesc::set_klass_gap(int v) {
   if (UseCompressedKlassPointers) {
     *(int*)(((intptr_t)this) + klass_gap_offset_in_bytes()) = v;
   }
 }
 inline 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 (UseCompressedKlassPointers) {
     _metadata._compressed_klass = encode_heap_oop(k);  // may be null (parnew overflow handling)
   } else {
     _metadata._klass = (Klass*)(address)k;
   }
 }
 inline oop oopDesc::list_ptr_from_klass() {
   // This is only to be used during GC, for from-space objects.
   if (UseCompressedKlassPointers) {
     return decode_heap_oop(_metadata._compressed_klass);
   } else {
     // Special case for GC
     return (oop)(address)_metadata._klass;
   }
 }
 inline void   oopDesc::init_mark()                 { set_mark(markOopDesc::prototype_for_object(this)); }
 inline bool oopDesc::is_a(Klass* k)        const { return klass()->is_subtype_of(k); }
 inline bool oopDesc::is_instance()           const { return klass()->oop_is_instance(); }
 inline bool oopDesc::is_instanceMirror()     const { return klass()->oop_is_instanceMirror(); }
 inline bool oopDesc::is_instanceRef()        const { return klass()->oop_is_instanceRef(); }
 inline bool oopDesc::is_array()              const { return klass()->oop_is_array(); }
 inline bool oopDesc::is_objArray()           const { return klass()->oop_is_objArray(); }
 inline bool oopDesc::is_typeArray()          const { return klass()->oop_is_typeArray(); }
 inline void*     oopDesc::field_base(int offset)        const { return (void*)&((char*)this)[offset]; }
 template <class T> inline T* oopDesc::obj_field_addr(int offset) const { return (T*)field_base(offset); }
 inline Metadata** oopDesc::metadata_field_addr(int offset) const { return (Metadata**)field_base(offset); }
 inline jbyte*    oopDesc::byte_field_addr(int offset)   const { return (jbyte*)   field_base(offset); }
 inline jchar*    oopDesc::char_field_addr(int offset)   const { return (jchar*)   field_base(offset); }
 inline jboolean* oopDesc::bool_field_addr(int offset)   const { return (jboolean*)field_base(offset); }
 inline jint*     oopDesc::int_field_addr(int offset)    const { return (jint*)    field_base(offset); }
 inline jshort*   oopDesc::short_field_addr(int offset)  const { return (jshort*)  field_base(offset); }
 inline jlong*    oopDesc::long_field_addr(int offset)   const { return (jlong*)   field_base(offset); }
 inline jfloat*   oopDesc::float_field_addr(int offset)  const { return (jfloat*)  field_base(offset); }
 inline jdouble*  oopDesc::double_field_addr(int offset) const { return (jdouble*) field_base(offset); }
 inline 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).
 inline bool oopDesc::is_null(oop obj)       { return obj == NULL; }
 inline bool oopDesc::is_null(Klass* obj)  { return obj == NULL; }
 inline bool oopDesc::is_null(narrowOop obj) { return obj == 0; }
 // 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 (intptr_t)obj % MinObjAlignmentInBytes == 0;
 }
 inline bool check_klass_alignment(Klass* obj) {
   return (intptr_t)obj % KlassAlignmentInBytes == 0;
 }
 inline 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;
 }
 inline narrowOop oopDesc::encode_heap_oop(oop v) {
   return (is_null(v)) ? (narrowOop)0 : encode_heap_oop_not_null(v);
 }
 inline 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), err_msg("address not aligned: " PTR_FORMAT, (void*) result));
   return result;
 }
 inline oop oopDesc::decode_heap_oop(narrowOop v) {
   return is_null(v) ? (oop)NULL : decode_heap_oop_not_null(v);
 }
 inline oop oopDesc::decode_heap_oop_not_null(oop v) { return v; }
 inline oop oopDesc::decode_heap_oop(oop v)  { return v; }
 // Encoding and decoding for klass field.  It is copied code, but someday
 // might not be the same as oop.
 inline narrowOop oopDesc::encode_klass_not_null(Klass* v) {
   assert(!is_null(v), "oop value can never be zero");
   assert(check_klass_alignment(v), "Address not aligned");
   address base = Universe::narrow_klass_base();
   int    shift = Universe::narrow_klass_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 klass pointer overflow");
   assert(decode_klass(result) == v, "reversibility");
   return (narrowOop)result;
 }
 inline narrowOop oopDesc::encode_klass(Klass* v) {
   return (is_null(v)) ? (narrowOop)0 : encode_klass_not_null(v);
 }
 inline Klass* oopDesc::decode_klass_not_null(narrowOop v) {
   assert(!is_null(v), "narrow oop value can never be zero");
   address base = Universe::narrow_klass_base();
   int    shift = Universe::narrow_klass_shift();
   Klass* result = (Klass*)(void*)((uintptr_t)base + ((uintptr_t)v << shift));
   assert(check_klass_alignment(result), err_msg("address not aligned: " PTR_FORMAT, (void*) result));
   return result;
 }
 inline Klass* oopDesc::decode_klass(narrowOop v) {
   return is_null(v) ? (Klass*)NULL : decode_klass_not_null(v);
 }
 // Load an oop out of the Java heap as is without decoding.
 // Called by GC to check for null before decoding.
 inline oop       oopDesc::load_heap_oop(oop* p)          { return *p; }
 inline narrowOop oopDesc::load_heap_oop(narrowOop* p)    { return *p; }
 // Load and decode an oop out of the Java heap into a wide oop.
 inline oop oopDesc::load_decode_heap_oop_not_null(oop* p)       { return *p; }
 inline 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
 inline oop oopDesc::load_decode_heap_oop(oop* p) { return *p; }
 inline oop oopDesc::load_decode_heap_oop(narrowOop* p) {
   return decode_heap_oop(*p);
 }
 // Store already encoded heap oop into the heap.
 inline void oopDesc::store_heap_oop(oop* p, oop v)                 { *p = v; }
 inline void oopDesc::store_heap_oop(narrowOop* p, narrowOop v)     { *p = v; }
 // Encode and store a heap oop.
 inline void oopDesc::encode_store_heap_oop_not_null(narrowOop* p, oop v) {
   *p = encode_heap_oop_not_null(v);
 }
 inline void oopDesc::encode_store_heap_oop_not_null(oop* p, oop v) { *p = v; }
 // Encode and store a heap oop allowing for null.
 inline void oopDesc::encode_store_heap_oop(narrowOop* p, oop v) {
   *p = encode_heap_oop(v);
 }
 inline void oopDesc::encode_store_heap_oop(oop* p, oop v) { *p = v; }
 // Store heap oop as is for volatile fields.
 inline void oopDesc::release_store_heap_oop(volatile oop* p, oop v) {
   OrderAccess::release_store_ptr(p, v);
 }
 inline void oopDesc::release_store_heap_oop(volatile narrowOop* p,
                                             narrowOop v) {
   OrderAccess::release_store(p, v);
 }
 inline 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));
 }
 inline void oopDesc::release_encode_store_heap_oop_not_null(
                                                       volatile oop* p, oop v) {
   OrderAccess::release_store_ptr(p, v);
 }
 inline void oopDesc::release_encode_store_heap_oop(volatile oop* p,
                                                            oop v) {
   OrderAccess::release_store_ptr(p, v);
 }
 inline 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.
 inline 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);
   }
 }
 // In order to put or get a field out of an instance, must first check
 // if the field has been compressed and uncompress it.
 inline 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));
 }
 inline volatile oop oopDesc::obj_field_volatile(int offset) const {
   volatile oop value = obj_field(offset);
   OrderAccess::acquire();
   return value;
 }
 inline 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);
 }
 inline Metadata* oopDesc::metadata_field(int offset) const {
   return *metadata_field_addr(offset);
 }
 inline void oopDesc::metadata_field_put(int offset, Metadata* value) {
   *metadata_field_addr(offset) = value;
 }
 inline 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);
 }
 inline void oopDesc::obj_field_put_volatile(int offset, oop value) {
   OrderAccess::release();
   obj_field_put(offset, value);
   OrderAccess::fence();
 }
 inline jbyte oopDesc::byte_field(int offset) const                  { return (jbyte) *byte_field_addr(offset);    }
 inline void oopDesc::byte_field_put(int offset, jbyte contents)     { *byte_field_addr(offset) = (jint) contents; }
 inline jboolean oopDesc::bool_field(int offset) const               { return (jboolean) *bool_field_addr(offset); }
 inline void oopDesc::bool_field_put(int offset, jboolean contents)  { *bool_field_addr(offset) = (jint) contents; }
 inline jchar oopDesc::char_field(int offset) const                  { return (jchar) *char_field_addr(offset);    }
 inline void oopDesc::char_field_put(int offset, jchar contents)     { *char_field_addr(offset) = (jint) contents; }
 inline jint oopDesc::int_field(int offset) const                    { return *int_field_addr(offset);        }
 inline void oopDesc::int_field_put(int offset, jint contents)       { *int_field_addr(offset) = contents;    }
 inline jshort oopDesc::short_field(int offset) const                { return (jshort) *short_field_addr(offset);  }
 inline void oopDesc::short_field_put(int offset, jshort contents)   { *short_field_addr(offset) = (jint) contents;}
 inline jlong oopDesc::long_field(int offset) const                  { return *long_field_addr(offset);       }
 inline void oopDesc::long_field_put(int offset, jlong contents)     { *long_field_addr(offset) = contents;   }
 inline jfloat oopDesc::float_field(int offset) const                { return *float_field_addr(offset);      }
 inline void oopDesc::float_field_put(int offset, jfloat contents)   { *float_field_addr(offset) = contents;  }
 inline jdouble oopDesc::double_field(int offset) const              { return *double_field_addr(offset);     }
 inline void oopDesc::double_field_put(int offset, jdouble contents) { *double_field_addr(offset) = contents; }
 inline address oopDesc::address_field(int offset) const              { return *address_field_addr(offset);     }
 inline void oopDesc::address_field_put(int offset, address contents) { *address_field_addr(offset) = contents; }
 inline 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)));
 }
 inline 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);
 }
 inline jbyte oopDesc::byte_field_acquire(int offset) const                  { return OrderAccess::load_acquire(byte_field_addr(offset));     }
 inline void oopDesc::release_byte_field_put(int offset, jbyte contents)     { OrderAccess::release_store(byte_field_addr(offset), contents); }
 inline jboolean oopDesc::bool_field_acquire(int offset) const               { return OrderAccess::load_acquire(bool_field_addr(offset));     }
 inline void oopDesc::release_bool_field_put(int offset, jboolean contents)  { OrderAccess::release_store(bool_field_addr(offset), contents); }
 inline jchar oopDesc::char_field_acquire(int offset) const                  { return OrderAccess::load_acquire(char_field_addr(offset));     }
 inline void oopDesc::release_char_field_put(int offset, jchar contents)     { OrderAccess::release_store(char_field_addr(offset), contents); }
 inline jint oopDesc::int_field_acquire(int offset) const                    { return OrderAccess::load_acquire(int_field_addr(offset));      }
 inline void oopDesc::release_int_field_put(int offset, jint contents)       { OrderAccess::release_store(int_field_addr(offset), contents);  }
 inline jshort oopDesc::short_field_acquire(int offset) const                { return (jshort)OrderAccess::load_acquire(short_field_addr(offset)); }
 inline void oopDesc::release_short_field_put(int offset, jshort contents)   { OrderAccess::release_store(short_field_addr(offset), contents);     }
 inline jlong oopDesc::long_field_acquire(int offset) const                  { return OrderAccess::load_acquire(long_field_addr(offset));       }
 inline void oopDesc::release_long_field_put(int offset, jlong contents)     { OrderAccess::release_store(long_field_addr(offset), contents);   }
 inline jfloat oopDesc::float_field_acquire(int offset) const                { return OrderAccess::load_acquire(float_field_addr(offset));      }
 inline void oopDesc::release_float_field_put(int offset, jfloat contents)   { OrderAccess::release_store(float_field_addr(offset), contents);  }
 inline jdouble oopDesc::double_field_acquire(int offset) const              { return OrderAccess::load_acquire(double_field_addr(offset));     }
 inline void oopDesc::release_double_field_put(int offset, jdouble contents) { OrderAccess::release_store(double_field_addr(offset), contents); }
 inline address oopDesc::address_field_acquire(int offset) const             { return (address) OrderAccess::load_ptr_acquire(address_field_addr(offset)); }
 inline void oopDesc::release_address_field_put(int offset, address contents) { OrderAccess::release_store_ptr(address_field_addr(offset), contents); }
 inline 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);
       // UseParNewGC, 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.
       // UseParNewGC 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() && UseParNewGC) ||
                (is_objArray()  && is_forwarded() && (UseParNewGC || 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;
 }
 inline int oopDesc::size()  {
   return size_given_klass(klass());
 }
 inline void update_barrier_set(void* p, oop v) {
   assert(oopDesc::bs() != NULL, "Uninitialized bs in oop!");
   oopDesc::bs()->write_ref_field(p, v);
 }
 template <class T> inline void update_barrier_set_pre(T* p, oop v) {
   oopDesc::bs()->write_ref_field_pre(p, v);
 }
 template <class T> inline 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);
     update_barrier_set((void*)p, v);  // cast away type
   }
 }
 template <class T> inline 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);
   update_barrier_set((void*)p, v);    // 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);
   }
 }
 inline 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);
   }
 }
 // Used only for markSweep, scavenging
 inline bool oopDesc::is_gc_marked() const {
   return mark()->is_marked();
 }
 inline bool oopDesc::is_locked() const {
   return mark()->is_locked();
 }
 inline bool oopDesc::is_unlocked() const {
   return mark()->is_unlocked();
 }
 inline bool oopDesc::has_bias_pattern() const {
   return mark()->has_bias_pattern();
 }
 // used only for asserts
 inline 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
 inline 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
 inline bool oopDesc::is_unlocked_oop() const {
   if (!Universe::heap()->is_in_reserved(this)) return false;
   return mark()->is_unlocked();
 }
 #endif // PRODUCT
 inline void oopDesc::follow_contents(void) {
   assert (is_gc_marked(), "should be marked");
   klass()->oop_follow_contents(this);
 }
 // Used by scavengers
 inline 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
 inline 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
 inline 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;
 }
 // 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.
 inline oop oopDesc::forwardee() const {
   return (oop) mark()->decode_pointer();
 }
 inline bool oopDesc::has_displaced_mark() const {
   return mark()->has_displaced_mark_helper();
 }
 inline markOop oopDesc::displaced_mark() const {
   return mark()->displaced_mark_helper();
 }
 inline void oopDesc::set_displaced_mark(markOop m) {
   mark()->set_displaced_mark_helper(m);
 }
 // The following method needs to be MT safe.
 inline 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();
   }
 }
 inline 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());
   }
 }
 inline 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();
   }
 }
 inline int oopDesc::adjust_pointers() {
   debug_only(int check_size = size());
   int s = klass()->oop_adjust_pointers(this);
   assert(s == check_size, "should be the same");
   return s;
 }
 #define OOP_ITERATE_DEFN(OopClosureType, nv_suffix)                        \
                                                                            \
 inline int oopDesc::oop_iterate(OopClosureType* blk) {                     \
   SpecializationStats::record_call();                                      \
   return klass()->oop_oop_iterate##nv_suffix(this, blk);               \
 }                                                                          \
                                                                            \
 inline int oopDesc::oop_iterate(OopClosureType* blk, MemRegion mr) {       \
   SpecializationStats::record_call();                                      \
   return klass()->oop_oop_iterate##nv_suffix##_m(this, blk, mr);       \
 }
 inline 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(&cl);
 }
 inline int oopDesc::oop_iterate_no_header(OopClosure* blk, MemRegion mr) {
   NoHeaderExtendedOopClosure cl(blk);
   return oop_iterate(&cl, mr);
 }
 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_ITERATE_DEFN)
 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_ITERATE_DEFN)
 #ifndef SERIALGC
 #define OOP_ITERATE_BACKWARDS_DEFN(OopClosureType, nv_suffix)              \
                                                                            \
 inline int oopDesc::oop_iterate_backwards(OopClosureType* blk) {           \
   SpecializationStats::record_call();                                      \
   return klass()->oop_oop_iterate_backwards##nv_suffix(this, blk);     \
 }
 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_ITERATE_BACKWARDS_DEFN)
 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_ITERATE_BACKWARDS_DEFN)
 #endif // !SERIALGC
 #endif // SHARE_VM_OOPS_OOP_INLINE_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/oops/oop.inline.hpp@8e47bac5643a (annotated)

src/share/vm/oops/oop.inline.hpp