1 /* 2 * Copyright (c) 2018, 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_VM_OOPS_CONSTANTPOOL_INLINE_HPP 26 #define SHARE_VM_OOPS_CONSTANTPOOL_INLINE_HPP 27 28 #include "oops/constantPool.hpp" 29 #include "oops/cpCache.inline.hpp" 30 #include "runtime/orderAccess.inline.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_VM_OOPS_CONSTANTPOOL_INLINE_HPP