jdk8-mips64-public/hotspot: src/share/vm/runtime/fieldDescriptor.cpp@634b8615a6ba (annotated)

src/share/vm/runtime/fieldDescriptor.cpp@634b8615a6ba (annotated)

src/share/vm/runtime/fieldDescriptor.cpp

Fri, 22 Jun 2012 14:00:39 -0400

author: jiangli
date: Fri, 22 Jun 2012 14:00:39 -0400
changeset 3879: 634b8615a6ba
parent 3803: 71afdabfd05b
child 4037: da91efe96a93
permissions: -rw-r--r--

7177409: Perf regression in JVM_GetClassDeclaredFields after generic signature changes.
Summary: In fieldDescriptor::generic_signature() returns NULL immediately if the field has no generic signature.
Reviewed-by: dholmes, coleenp, jcoomes

 /*
  * Copyright (c) 1997, 2010, 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.
  *
  */
 #include "precompiled.hpp"
 #include "classfile/systemDictionary.hpp"
 #include "classfile/vmSymbols.hpp"
 #include "memory/resourceArea.hpp"
 #include "memory/universe.inline.hpp"
 #include "oops/instanceKlass.hpp"
 #include "oops/fieldStreams.hpp"
 #include "runtime/fieldDescriptor.hpp"
 #include "runtime/handles.inline.hpp"
 #include "runtime/signature.hpp"
 oop fieldDescriptor::loader() const {
   return instanceKlass::cast(_cp->pool_holder())->class_loader();
 }
 Symbol* fieldDescriptor::generic_signature() const {
   if (!has_generic_signature()) {
     return NULL;
   }
   int idx = 0;
   instanceKlass* ik = instanceKlass::cast(field_holder());
   for (AllFieldStream fs(ik); !fs.done(); fs.next()) {
     if (idx == _index) {
       return fs.generic_signature();
     } else {
       idx ++;
     }
   }
   assert(false, "should never happen");
   return NULL;
 }
 typeArrayOop fieldDescriptor::annotations() const {
   instanceKlass* ik = instanceKlass::cast(field_holder());
   objArrayOop md = ik->fields_annotations();
   if (md == NULL)
     return NULL;
   return typeArrayOop(md->obj_at(index()));
 }
 constantTag fieldDescriptor::initial_value_tag() const {
   return constants()->tag_at(initial_value_index());
 }
 jint fieldDescriptor::int_initial_value() const {
   return constants()->int_at(initial_value_index());
 }
 jlong fieldDescriptor::long_initial_value() const {
   return constants()->long_at(initial_value_index());
 }
 jfloat fieldDescriptor::float_initial_value() const {
   return constants()->float_at(initial_value_index());
 }
 jdouble fieldDescriptor::double_initial_value() const {
   return constants()->double_at(initial_value_index());
 }
 oop fieldDescriptor::string_initial_value(TRAPS) const {
   return constants()->string_at(initial_value_index(), CHECK_0);
 }
 void fieldDescriptor::initialize(klassOop k, int index) {
   instanceKlass* ik = instanceKlass::cast(k);
   _cp = ik->constants();
   FieldInfo* f = ik->field(index);
   assert(!f->is_internal(), "regular Java fields only");
   _access_flags = accessFlags_from(f->access_flags());
   guarantee(f->name_index() != 0 && f->signature_index() != 0, "bad constant pool index for fieldDescriptor");
   _index = index;
 }
 #ifndef PRODUCT
 void fieldDescriptor::print_on(outputStream* st) const {
   access_flags().print_on(st);
   name()->print_value_on(st);
   st->print(" ");
   signature()->print_value_on(st);
   st->print(" @%d ", offset());
   if (WizardMode && has_initial_value()) {
     st->print("(initval ");
     constantTag t = initial_value_tag();
     if (t.is_int()) {
       st->print("int %d)", int_initial_value());
     } else if (t.is_long()){
       st->print_jlong(long_initial_value());
     } else if (t.is_float()){
       st->print("float %f)", float_initial_value());
     } else if (t.is_double()){
       st->print("double %lf)", double_initial_value());
     }
   }
 }
 void fieldDescriptor::print_on_for(outputStream* st, oop obj) {
   print_on(st);
   BasicType ft = field_type();
   jint as_int = 0;
   switch (ft) {
     case T_BYTE:
       as_int = (jint)obj->byte_field(offset());
       st->print(" %d", obj->byte_field(offset()));
       break;
     case T_CHAR:
       as_int = (jint)obj->char_field(offset());
       {
         jchar c = obj->char_field(offset());
         as_int = c;
         st->print(" %c %d", isprint(c) ? c : ' ', c);
       }
       break;
     case T_DOUBLE:
       st->print(" %lf", obj->double_field(offset()));
       break;
     case T_FLOAT:
       as_int = obj->int_field(offset());
       st->print(" %f", obj->float_field(offset()));
       break;
     case T_INT:
       as_int = obj->int_field(offset());
       st->print(" %d", obj->int_field(offset()));
       break;
     case T_LONG:
       st->print(" ");
       st->print_jlong(obj->long_field(offset()));
       break;
     case T_SHORT:
       as_int = obj->short_field(offset());
       st->print(" %d", obj->short_field(offset()));
       break;
     case T_BOOLEAN:
       as_int = obj->bool_field(offset());
       st->print(" %s", obj->bool_field(offset()) ? "true" : "false");
       break;
     case T_ARRAY:
       st->print(" ");
       NOT_LP64(as_int = obj->int_field(offset()));
       obj->obj_field(offset())->print_value_on(st);
       break;
     case T_OBJECT:
       st->print(" ");
       NOT_LP64(as_int = obj->int_field(offset()));
       obj->obj_field(offset())->print_value_on(st);
       break;
     default:
       ShouldNotReachHere();
       break;
   }
   // Print a hint as to the underlying integer representation. This can be wrong for
   // pointers on an LP64 machine
   if (ft == T_LONG || ft == T_DOUBLE LP64_ONLY(|| !is_java_primitive(ft)) ) {
     st->print(" (%x %x)", obj->int_field(offset()), obj->int_field(offset()+sizeof(jint)));
   } else if (as_int < 0 || as_int > 9) {
     st->print(" (%x)", as_int);
   }
 }
 #endif /* PRODUCT */

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/runtime/fieldDescriptor.cpp@634b8615a6ba (annotated)

src/share/vm/runtime/fieldDescriptor.cpp