hotspot/src/share/vm/runtime/fieldDescriptor.cpp
author kamg
Fri, 08 Jun 2012 12:49:12 -0400
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permissions -rw-r--r--
7158804: Improve config file parsing Summary: Check buffer length when reading Reviewed-by: dholmes, dcubed
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/*
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 * Copyright (c) 1997, 2010, 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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#include "precompiled.hpp"
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#include "classfile/systemDictionary.hpp"
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#include "classfile/vmSymbols.hpp"
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#include "memory/resourceArea.hpp"
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#include "memory/universe.inline.hpp"
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#include "oops/instanceKlass.hpp"
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#include "runtime/fieldDescriptor.hpp"
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#include "runtime/handles.inline.hpp"
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#include "runtime/signature.hpp"
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oop fieldDescriptor::loader() const {
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  return instanceKlass::cast(_cp->pool_holder())->class_loader();
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}
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typeArrayOop fieldDescriptor::annotations() const {
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  instanceKlass* ik = instanceKlass::cast(field_holder());
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  objArrayOop md = ik->fields_annotations();
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  if (md == NULL)
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    return NULL;
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  return typeArrayOop(md->obj_at(index()));
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}
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constantTag fieldDescriptor::initial_value_tag() const {
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  return constants()->tag_at(initial_value_index());
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}
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jint fieldDescriptor::int_initial_value() const {
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  return constants()->int_at(initial_value_index());
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}
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jlong fieldDescriptor::long_initial_value() const {
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  return constants()->long_at(initial_value_index());
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}
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jfloat fieldDescriptor::float_initial_value() const {
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  return constants()->float_at(initial_value_index());
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}
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jdouble fieldDescriptor::double_initial_value() const {
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  return constants()->double_at(initial_value_index());
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}
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oop fieldDescriptor::string_initial_value(TRAPS) const {
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  return constants()->string_at(initial_value_index(), CHECK_0);
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}
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void fieldDescriptor::initialize(klassOop k, int index) {
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  instanceKlass* ik = instanceKlass::cast(k);
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  _cp = ik->constants();
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  FieldInfo* f = ik->field(index);
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  assert(!f->is_internal(), "regular Java fields only");
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  _access_flags = accessFlags_from(f->access_flags());
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  guarantee(f->name_index() != 0 && f->signature_index() != 0, "bad constant pool index for fieldDescriptor");
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  _index = index;
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}
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#ifndef PRODUCT
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void fieldDescriptor::print_on(outputStream* st) const {
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  access_flags().print_on(st);
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  name()->print_value_on(st);
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  st->print(" ");
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  signature()->print_value_on(st);
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  st->print(" @%d ", offset());
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  if (WizardMode && has_initial_value()) {
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    st->print("(initval ");
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    constantTag t = initial_value_tag();
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    if (t.is_int()) {
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      st->print("int %d)", int_initial_value());
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    } else if (t.is_long()){
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      st->print_jlong(long_initial_value());
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    } else if (t.is_float()){
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      st->print("float %f)", float_initial_value());
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    } else if (t.is_double()){
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      st->print("double %lf)", double_initial_value());
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    }
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  }
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}
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void fieldDescriptor::print_on_for(outputStream* st, oop obj) {
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  print_on(st);
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  BasicType ft = field_type();
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  jint as_int = 0;
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  switch (ft) {
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    case T_BYTE:
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      as_int = (jint)obj->byte_field(offset());
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      st->print(" %d", obj->byte_field(offset()));
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      break;
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    case T_CHAR:
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      as_int = (jint)obj->char_field(offset());
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      {
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        jchar c = obj->char_field(offset());
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        as_int = c;
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        st->print(" %c %d", isprint(c) ? c : ' ', c);
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      }
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      break;
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    case T_DOUBLE:
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      st->print(" %lf", obj->double_field(offset()));
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      break;
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    case T_FLOAT:
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      as_int = obj->int_field(offset());
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      st->print(" %f", obj->float_field(offset()));
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      break;
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    case T_INT:
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      as_int = obj->int_field(offset());
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      st->print(" %d", obj->int_field(offset()));
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      break;
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    case T_LONG:
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      st->print(" ");
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      st->print_jlong(obj->long_field(offset()));
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      break;
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    case T_SHORT:
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      as_int = obj->short_field(offset());
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      st->print(" %d", obj->short_field(offset()));
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      break;
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    case T_BOOLEAN:
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      as_int = obj->bool_field(offset());
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      st->print(" %s", obj->bool_field(offset()) ? "true" : "false");
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      break;
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    case T_ARRAY:
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      st->print(" ");
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      NOT_LP64(as_int = obj->int_field(offset()));
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      obj->obj_field(offset())->print_value_on(st);
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      break;
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    case T_OBJECT:
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      st->print(" ");
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      NOT_LP64(as_int = obj->int_field(offset()));
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      obj->obj_field(offset())->print_value_on(st);
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      break;
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    default:
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      ShouldNotReachHere();
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      break;
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  }
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  // Print a hint as to the underlying integer representation. This can be wrong for
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  // pointers on an LP64 machine
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  if (ft == T_LONG || ft == T_DOUBLE LP64_ONLY(|| !is_java_primitive(ft)) ) {
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    st->print(" (%x %x)", obj->int_field(offset()), obj->int_field(offset()+sizeof(jint)));
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  } else if (as_int < 0 || as_int > 9) {
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    st->print(" (%x)", as_int);
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  }
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}
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#endif /* PRODUCT */