1/* 2 * Copyright (c) 2014, 2016, 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#include "precompiled.hpp" 25#include "memory/allocation.hpp" 26#include "memory/allocation.inline.hpp" 27#include "memory/guardedMemory.hpp" 28#include "runtime/os.hpp" 29 30void* GuardedMemory::wrap_copy(const void* ptr, const size_t len, const void* tag) { 31 size_t total_sz = GuardedMemory::get_total_size(len); 32 void* outerp = os::malloc(total_sz, mtInternal); 33 if (outerp != NULL) { 34 GuardedMemory guarded(outerp, len, tag); 35 void* innerp = guarded.get_user_ptr(); 36 memcpy(innerp, ptr, len); 37 return innerp; 38 } 39 return NULL; // OOM 40} 41 42bool GuardedMemory::free_copy(void* p) { 43 if (p == NULL) { 44 return true; 45 } 46 GuardedMemory guarded((u_char*)p); 47 bool verify_ok = guarded.verify_guards(); 48 49 /* always attempt to free, pass problem on to any nested memchecker */ 50 os::free(guarded.release_for_freeing()); 51 52 return verify_ok; 53} 54 55void GuardedMemory::print_on(outputStream* st) const { 56 if (_base_addr == NULL) { 57 st->print_cr("GuardedMemory(" PTR_FORMAT ") not associated to any memory", p2i(this)); 58 return; 59 } 60 st->print_cr("GuardedMemory(" PTR_FORMAT ") base_addr=" PTR_FORMAT 61 " tag=" PTR_FORMAT " user_size=" SIZE_FORMAT " user_data=" PTR_FORMAT, 62 p2i(this), p2i(_base_addr), p2i(get_tag()), get_user_size(), p2i(get_user_ptr())); 63 64 Guard* guard = get_head_guard(); 65 st->print_cr(" Header guard @" PTR_FORMAT " is %s", p2i(guard), (guard->verify() ? "OK" : "BROKEN")); 66 guard = get_tail_guard(); 67 st->print_cr(" Trailer guard @" PTR_FORMAT " is %s", p2i(guard), (guard->verify() ? "OK" : "BROKEN")); 68 69 u_char udata = *get_user_ptr(); 70 switch (udata) { 71 case uninitBlockPad: 72 st->print_cr(" User data appears unused"); 73 break; 74 case freeBlockPad: 75 st->print_cr(" User data appears to have been freed"); 76 break; 77 default: 78 st->print_cr(" User data appears to be in use"); 79 break; 80 } 81} 82