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 // The CodeCache implements the code cache for various pieces of generated
26 // code, e.g., compiled java methods, runtime stubs, transition frames, etc.
27 // The entries in the CodeCache are all CodeBlob's.
28
29 // Implementation:
30 // - Each CodeBlob occupies one chunk of memory.
31 // - Like the offset table in oldspace the zone has at table for
32 // locating a method given a addess of an instruction.
33
34 class OopClosure;
35 class DepChange;
36
37 class CodeCache : AllStatic {
38 friend class VMStructs;
39 private:
40 // CodeHeap is malloc()'ed at startup and never deleted during shutdown,
41 // so that the generated assembly code is always there when it's needed.
42 // This may cause memory leak, but is necessary, for now. See 4423824,
43 // 4422213 or 4436291 for details.
44 static CodeHeap * _heap;
155 static void clear_inline_caches(); // clear all inline caches
156
157 static nmethod* find_and_remove_saved_code(methodOop m);
158 static void remove_saved_code(nmethod* nm);
159 static void speculatively_disconnect(nmethod* nm);
160
161 // Deoptimization
162 static int mark_for_deoptimization(DepChange& changes);
163 #ifdef HOTSWAP
164 static int mark_for_evol_deoptimization(instanceKlassHandle dependee);
165 #endif // HOTSWAP
166
167 static void mark_all_nmethods_for_deoptimization();
168 static int mark_for_deoptimization(methodOop dependee);
169 static void make_marked_nmethods_zombies();
170 static void make_marked_nmethods_not_entrant();
171
172 // tells how many nmethods have dependencies
173 static int number_of_nmethods_with_dependencies();
174 };
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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_CODE_CODECACHE_HPP
26 #define SHARE_VM_CODE_CODECACHE_HPP
27
28 #include "code/codeBlob.hpp"
29 #include "memory/allocation.hpp"
30 #include "memory/heap.hpp"
31 #include "oops/instanceKlass.hpp"
32 #include "oops/oopsHierarchy.hpp"
33
34 // The CodeCache implements the code cache for various pieces of generated
35 // code, e.g., compiled java methods, runtime stubs, transition frames, etc.
36 // The entries in the CodeCache are all CodeBlob's.
37
38 // Implementation:
39 // - Each CodeBlob occupies one chunk of memory.
40 // - Like the offset table in oldspace the zone has at table for
41 // locating a method given a addess of an instruction.
42
43 class OopClosure;
44 class DepChange;
45
46 class CodeCache : AllStatic {
47 friend class VMStructs;
48 private:
49 // CodeHeap is malloc()'ed at startup and never deleted during shutdown,
50 // so that the generated assembly code is always there when it's needed.
51 // This may cause memory leak, but is necessary, for now. See 4423824,
52 // 4422213 or 4436291 for details.
53 static CodeHeap * _heap;
164 static void clear_inline_caches(); // clear all inline caches
165
166 static nmethod* find_and_remove_saved_code(methodOop m);
167 static void remove_saved_code(nmethod* nm);
168 static void speculatively_disconnect(nmethod* nm);
169
170 // Deoptimization
171 static int mark_for_deoptimization(DepChange& changes);
172 #ifdef HOTSWAP
173 static int mark_for_evol_deoptimization(instanceKlassHandle dependee);
174 #endif // HOTSWAP
175
176 static void mark_all_nmethods_for_deoptimization();
177 static int mark_for_deoptimization(methodOop dependee);
178 static void make_marked_nmethods_zombies();
179 static void make_marked_nmethods_not_entrant();
180
181 // tells how many nmethods have dependencies
182 static int number_of_nmethods_with_dependencies();
183 };
184
185 #endif // SHARE_VM_CODE_CODECACHE_HPP
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