1 /*
   2  * Copyright (c) 2018, 2019, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_OOPS_CONSTANTPOOL_INLINE_HPP
  26 #define SHARE_OOPS_CONSTANTPOOL_INLINE_HPP
  27 
  28 #include "oops/constantPool.hpp"
  29 #include "oops/cpCache.inline.hpp"
  30 #include "runtime/orderAccess.hpp"
  31 
  32 inline CPSlot ConstantPool::slot_at(int which) const {
  33   assert(is_within_bounds(which), "index out of bounds");
  34   assert(!tag_at(which).is_unresolved_klass() && !tag_at(which).is_unresolved_klass_in_error(), "Corrupted constant pool");
  35   // Uses volatile because the klass slot changes without a lock.
  36   intptr_t adr = OrderAccess::load_acquire(obj_at_addr(which));
  37   assert(adr != 0 || which == 0, "cp entry for klass should not be zero");
  38   return CPSlot(adr);
  39 }
  40 
  41 inline Klass* ConstantPool::resolved_klass_at(int which) const {  // Used by Compiler
  42   guarantee(tag_at(which).is_klass(), "Corrupted constant pool");
  43   // Must do an acquire here in case another thread resolved the klass
  44   // behind our back, lest we later load stale values thru the oop.
  45   CPKlassSlot kslot = klass_slot_at(which);
  46   assert(tag_at(kslot.name_index()).is_symbol(), "sanity");
  47 
  48   Klass** adr = resolved_klasses()->adr_at(kslot.resolved_klass_index());
  49   return OrderAccess::load_acquire(adr);
  50 }
  51 
  52 inline bool ConstantPool::is_pseudo_string_at(int which) {
  53   assert(tag_at(which).is_string(), "Corrupted constant pool");
  54   return slot_at(which).is_pseudo_string();
  55 }
  56 
  57 inline oop ConstantPool::pseudo_string_at(int which, int obj_index) {
  58   assert(is_pseudo_string_at(which), "must be a pseudo-string");
  59   oop s = resolved_references()->obj_at(obj_index);
  60   return s;
  61 }
  62 
  63 inline oop ConstantPool::pseudo_string_at(int which) {
  64   assert(is_pseudo_string_at(which), "must be a pseudo-string");
  65   int obj_index = cp_to_object_index(which);
  66   oop s = resolved_references()->obj_at(obj_index);
  67   return s;
  68 }
  69 
  70 #endif // SHARE_OOPS_CONSTANTPOOL_INLINE_HPP