1 /*
2 * Copyright (c) 1997, 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 *
152 void ResourceObj::operator delete(void* p) {
153 assert(((ResourceObj *)p)->allocated_on_C_heap(),
154 "delete only allowed for C_HEAP objects");
155 DEBUG_ONLY(((ResourceObj *)p)->_allocation_t[0] = (uintptr_t)badHeapOopVal;)
156 FreeHeap(p);
157 }
158
159 void ResourceObj::operator delete [](void* p) {
160 operator delete(p);
161 }
162
163 #ifdef ASSERT
164 void ResourceObj::set_allocation_type(address res, allocation_type type) {
165 // Set allocation type in the resource object
166 uintptr_t allocation = (uintptr_t)res;
167 assert((allocation & allocation_mask) == 0, "address should be aligned to 4 bytes at least: " INTPTR_FORMAT, p2i(res));
168 assert(type <= allocation_mask, "incorrect allocation type");
169 ResourceObj* resobj = (ResourceObj *)res;
170 resobj->_allocation_t[0] = ~(allocation + type);
171 if (type != STACK_OR_EMBEDDED) {
172 // Called from operator new() and CollectionSetChooser(),
173 // set verification value.
174 resobj->_allocation_t[1] = (uintptr_t)&(resobj->_allocation_t[1]) + type;
175 }
176 }
177
178 ResourceObj::allocation_type ResourceObj::get_allocation_type() const {
179 assert(~(_allocation_t[0] | allocation_mask) == (uintptr_t)this, "lost resource object");
180 return (allocation_type)((~_allocation_t[0]) & allocation_mask);
181 }
182
183 bool ResourceObj::is_type_set() const {
184 allocation_type type = (allocation_type)(_allocation_t[1] & allocation_mask);
185 return get_allocation_type() == type &&
186 (_allocation_t[1] - type) == (uintptr_t)(&_allocation_t[1]);
187 }
188
189 // This whole business of passing information from ResourceObj::operator new
190 // to the ResourceObj constructor via fields in the "object" is technically UB.
191 // But it seems to work within the limitations of HotSpot usage (such as no
192 // multiple inheritance) with the compilers and compiler options we're using.
193 // And it gives some possibly useful checking for misuse of ResourceObj.
|
1 /*
2 * Copyright (c) 1997, 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 *
152 void ResourceObj::operator delete(void* p) {
153 assert(((ResourceObj *)p)->allocated_on_C_heap(),
154 "delete only allowed for C_HEAP objects");
155 DEBUG_ONLY(((ResourceObj *)p)->_allocation_t[0] = (uintptr_t)badHeapOopVal;)
156 FreeHeap(p);
157 }
158
159 void ResourceObj::operator delete [](void* p) {
160 operator delete(p);
161 }
162
163 #ifdef ASSERT
164 void ResourceObj::set_allocation_type(address res, allocation_type type) {
165 // Set allocation type in the resource object
166 uintptr_t allocation = (uintptr_t)res;
167 assert((allocation & allocation_mask) == 0, "address should be aligned to 4 bytes at least: " INTPTR_FORMAT, p2i(res));
168 assert(type <= allocation_mask, "incorrect allocation type");
169 ResourceObj* resobj = (ResourceObj *)res;
170 resobj->_allocation_t[0] = ~(allocation + type);
171 if (type != STACK_OR_EMBEDDED) {
172 // Called from operator new(), set verification value.
173 resobj->_allocation_t[1] = (uintptr_t)&(resobj->_allocation_t[1]) + type;
174 }
175 }
176
177 ResourceObj::allocation_type ResourceObj::get_allocation_type() const {
178 assert(~(_allocation_t[0] | allocation_mask) == (uintptr_t)this, "lost resource object");
179 return (allocation_type)((~_allocation_t[0]) & allocation_mask);
180 }
181
182 bool ResourceObj::is_type_set() const {
183 allocation_type type = (allocation_type)(_allocation_t[1] & allocation_mask);
184 return get_allocation_type() == type &&
185 (_allocation_t[1] - type) == (uintptr_t)(&_allocation_t[1]);
186 }
187
188 // This whole business of passing information from ResourceObj::operator new
189 // to the ResourceObj constructor via fields in the "object" is technically UB.
190 // But it seems to work within the limitations of HotSpot usage (such as no
191 // multiple inheritance) with the compilers and compiler options we're using.
192 // And it gives some possibly useful checking for misuse of ResourceObj.
|