jdk8-mips64-public/hotspot: src/share/vm/oops/fieldStreams.hpp@55a0da3d420b (annotated)

src/share/vm/oops/fieldStreams.hpp@55a0da3d420b (annotated)

src/share/vm/oops/fieldStreams.hpp

Tue, 26 Nov 2013 14:35:38 +0100

author: sjohanss
date: Tue, 26 Nov 2013 14:35:38 +0100
changeset 6148: 55a0da3d420b
parent 5732: b2e698d2276c
child 6876: 710a3c8b516e
permissions: -rw-r--r--

8027675: Full collections with Serial slower in JDK 8 compared to 7u40
Summary: Reduced the number of calls to follow_class_loader and instead marked and pushed the klass holder directly. Also removed unneeded calls to adjust_klass.
Reviewed-by: coleenp, jmasa, mgerdin, tschatzl

 /*
  * Copyright (c) 2011, 2013, 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_FIELDSTREAMS_HPP
 #define SHARE_VM_OOPS_FIELDSTREAMS_HPP
 #include "oops/instanceKlass.hpp"
 #include "oops/fieldInfo.hpp"
 #include "runtime/fieldDescriptor.hpp"
 // The is the base class for iteration over the fields array
 // describing the declared fields in the class.  Several subclasses
 // are provided depending on the kind of iteration required.  The
 // JavaFieldStream is for iterating over regular Java fields and it
 // generally the preferred iterator.  InternalFieldStream only
 // iterates over fields that have been injected by the JVM.
 // AllFieldStream exposes all fields and should only be used in rare
 // cases.
 class FieldStreamBase : public StackObj {
  protected:
   Array<u2>*          _fields;
   constantPoolHandle  _constants;
   int                 _index;
   int                 _limit;
   int                 _generic_signature_slot;
   fieldDescriptor     _fd_buf;
   FieldInfo* field() const { return FieldInfo::from_field_array(_fields, _index); }
   InstanceKlass* field_holder() const { return _constants->pool_holder(); }
   int init_generic_signature_start_slot() {
     int length = _fields->length();
     int num_fields = 0;
     int skipped_generic_signature_slots = 0;
     FieldInfo* fi;
     AccessFlags flags;
     /* Scan from 0 to the current _index. Count the number of generic
        signature slots for field[0] to field[_index - 1]. */
     for (int i = 0; i < _index; i++) {
       fi = FieldInfo::from_field_array(_fields, i);
       flags.set_flags(fi->access_flags());
       if (flags.field_has_generic_signature()) {
         length --;
         skipped_generic_signature_slots ++;
       }
     }
     /* Scan from the current _index. */
     for (int i = _index; i*FieldInfo::field_slots < length; i++) {
       fi = FieldInfo::from_field_array(_fields, i);
       flags.set_flags(fi->access_flags());
       if (flags.field_has_generic_signature()) {
         length --;
       }
       num_fields ++;
     }
     _generic_signature_slot = length + skipped_generic_signature_slots;
     assert(_generic_signature_slot <= _fields->length(), "");
     return num_fields;
   }
   FieldStreamBase(Array<u2>* fields, constantPoolHandle constants, int start, int limit) {
     _fields = fields;
     _constants = constants;
     _index = start;
     int num_fields = init_generic_signature_start_slot();
     if (limit < start) {
       _limit = num_fields;
     } else {
       _limit = limit;
     }
   }
   FieldStreamBase(Array<u2>* fields, constantPoolHandle constants) {
     _fields = fields;
     _constants = constants;
     _index = 0;
     _limit = init_generic_signature_start_slot();
   }
  public:
   FieldStreamBase(InstanceKlass* klass) {
     _fields = klass->fields();
     _constants = klass->constants();
     _index = 0;
     _limit = klass->java_fields_count();
     init_generic_signature_start_slot();
     assert(klass == field_holder(), "");
   }
   FieldStreamBase(instanceKlassHandle klass) {
     _fields = klass->fields();
     _constants = klass->constants();
     _index = 0;
     _limit = klass->java_fields_count();
     init_generic_signature_start_slot();
     assert(klass == field_holder(), "");
   }
   // accessors
   int index() const                 { return _index; }
   void next() {
     if (access_flags().field_has_generic_signature()) {
       _generic_signature_slot ++;
       assert(_generic_signature_slot <= _fields->length(), "");
     }
     _index += 1;
   }
   bool done() const { return _index >= _limit; }
   // Accessors for current field
   AccessFlags access_flags() const {
     AccessFlags flags;
     flags.set_flags(field()->access_flags());
     return flags;
   }
   void set_access_flags(u2 flags) const {
     field()->set_access_flags(flags);
   }
   void set_access_flags(AccessFlags flags) const {
     set_access_flags(flags.as_short());
   }
   Symbol* name() const {
     return field()->name(_constants);
   }
   Symbol* signature() const {
     return field()->signature(_constants);
   }
   Symbol* generic_signature() const {
     if (access_flags().field_has_generic_signature()) {
       assert(_generic_signature_slot < _fields->length(), "out of bounds");
       int index = _fields->at(_generic_signature_slot);
       return _constants->symbol_at(index);
     } else {
       return NULL;
     }
   }
   int offset() const {
     return field()->offset();
   }
   int allocation_type() const {
     return field()->allocation_type();
   }
   void set_offset(int offset) {
     field()->set_offset(offset);
   }
   bool is_offset_set() const {
     return field()->is_offset_set();
   }
   bool is_contended() const {
     return field()->is_contended();
   }
   int contended_group() const {
     return field()->contended_group();
   }
   // bridge to a heavier API:
   fieldDescriptor& field_descriptor() const {
     fieldDescriptor& field = const_cast<fieldDescriptor&>(_fd_buf);
     field.reinitialize(field_holder(), _index);
     return field;
   }
 };
 // Iterate over only the internal fields
 class JavaFieldStream : public FieldStreamBase {
  public:
   JavaFieldStream(instanceKlassHandle k): FieldStreamBase(k->fields(), k->constants(), 0, k->java_fields_count()) {}
   int name_index() const {
     assert(!field()->is_internal(), "regular only");
     return field()->name_index();
   }
   void set_name_index(int index) {
     assert(!field()->is_internal(), "regular only");
     field()->set_name_index(index);
   }
   int signature_index() const {
     assert(!field()->is_internal(), "regular only");
     return field()->signature_index();
   }
   void set_signature_index(int index) {
     assert(!field()->is_internal(), "regular only");
     field()->set_signature_index(index);
   }
   int generic_signature_index() const {
     assert(!field()->is_internal(), "regular only");
     if (access_flags().field_has_generic_signature()) {
       assert(_generic_signature_slot < _fields->length(), "out of bounds");
       return _fields->at(_generic_signature_slot);
     } else {
       return 0;
     }
   }
   void set_generic_signature_index(int index) {
     assert(!field()->is_internal(), "regular only");
     if (access_flags().field_has_generic_signature()) {
       assert(_generic_signature_slot < _fields->length(), "out of bounds");
       _fields->at_put(_generic_signature_slot, index);
     }
   }
   int initval_index() const {
     assert(!field()->is_internal(), "regular only");
     return field()->initval_index();
   }
   void set_initval_index(int index) {
     assert(!field()->is_internal(), "regular only");
     return field()->set_initval_index(index);
   }
 };
 // Iterate over only the internal fields
 class InternalFieldStream : public FieldStreamBase {
  public:
   InternalFieldStream(InstanceKlass* k):      FieldStreamBase(k->fields(), k->constants(), k->java_fields_count(), 0) {}
   InternalFieldStream(instanceKlassHandle k): FieldStreamBase(k->fields(), k->constants(), k->java_fields_count(), 0) {}
 };
 class AllFieldStream : public FieldStreamBase {
  public:
   AllFieldStream(Array<u2>* fields, constantPoolHandle constants): FieldStreamBase(fields, constants) {}
   AllFieldStream(InstanceKlass* k):      FieldStreamBase(k->fields(), k->constants()) {}
   AllFieldStream(instanceKlassHandle k): FieldStreamBase(k->fields(), k->constants()) {}
 };
 #endif // SHARE_VM_OOPS_FIELDSTREAMS_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/oops/fieldStreams.hpp@55a0da3d420b (annotated)

src/share/vm/oops/fieldStreams.hpp