Mon, 18 Mar 2013 13:19:06 +0100
8008555: Debugging code in compiled method sometimes leaks memory
Summary: support for strings that have same life-time as code that uses them.
Reviewed-by: kvn, twisti
duke@435 | 1 | /* |
coleenp@4037 | 2 | * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. |
duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
duke@435 | 4 | * |
duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
duke@435 | 7 | * published by the Free Software Foundation. |
duke@435 | 8 | * |
duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
duke@435 | 13 | * accompanied this code). |
duke@435 | 14 | * |
duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
duke@435 | 18 | * |
trims@1907 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
trims@1907 | 20 | * or visit www.oracle.com if you need additional information or have any |
trims@1907 | 21 | * questions. |
duke@435 | 22 | * |
duke@435 | 23 | */ |
duke@435 | 24 | |
stefank@2314 | 25 | #ifndef SHARE_VM_RUNTIME_SWEEPER_HPP |
stefank@2314 | 26 | #define SHARE_VM_RUNTIME_SWEEPER_HPP |
stefank@2314 | 27 | |
duke@435 | 28 | // An NmethodSweeper is an incremental cleaner for: |
duke@435 | 29 | // - cleanup inline caches |
duke@435 | 30 | // - reclamation of unreferences zombie nmethods |
duke@435 | 31 | // |
duke@435 | 32 | |
duke@435 | 33 | class NMethodSweeper : public AllStatic { |
duke@435 | 34 | static long _traversals; // Stack traversal count |
never@1970 | 35 | static nmethod* _current; // Current nmethod |
duke@435 | 36 | static int _seen; // Nof. nmethod we have currently processed in current pass of CodeCache |
never@1999 | 37 | |
never@1999 | 38 | static volatile int _invocations; // No. of invocations left until we are completed with this pass |
never@1999 | 39 | static volatile int _sweep_started; // Flag to control conc sweeper |
duke@435 | 40 | |
duke@435 | 41 | static bool _rescan; // Indicates that we should do a full rescan of the |
duke@435 | 42 | // of the code cache looking for work to do. |
never@1893 | 43 | static bool _do_sweep; // Flag to skip the conc sweep if no stack scan happened |
duke@435 | 44 | static int _locked_seen; // Number of locked nmethods encountered during the scan |
duke@435 | 45 | static int _not_entrant_seen_on_stack; // Number of not entrant nmethod were are still on stack |
duke@435 | 46 | |
kvn@1637 | 47 | static bool _was_full; // remember if we did emergency unloading |
kvn@1637 | 48 | static jint _advise_to_sweep; // flag to indicate code cache getting full |
kvn@1637 | 49 | static jlong _last_was_full; // timestamp of last emergency unloading |
kvn@1637 | 50 | static uint _highest_marked; // highest compile id dumped at last emergency unloading |
kvn@1637 | 51 | static long _was_full_traversal; // trav number at last emergency unloading |
duke@435 | 52 | |
duke@435 | 53 | static void process_nmethod(nmethod *nm); |
never@1999 | 54 | |
coleenp@4037 | 55 | static void release_nmethod(nmethod* nm); |
coleenp@4037 | 56 | |
never@1999 | 57 | static void log_sweep(const char* msg, const char* format = NULL, ...); |
never@1999 | 58 | |
duke@435 | 59 | public: |
duke@435 | 60 | static long traversal_count() { return _traversals; } |
duke@435 | 61 | |
never@2916 | 62 | #ifdef ASSERT |
never@2916 | 63 | // Keep track of sweeper activity in the ring buffer |
never@2916 | 64 | static void record_sweep(nmethod* nm, int line); |
never@2916 | 65 | static void report_events(int id, address entry); |
never@2916 | 66 | static void report_events(); |
never@2916 | 67 | #endif |
never@2916 | 68 | |
never@1893 | 69 | static void scan_stacks(); // Invoked at the end of each safepoint |
never@1893 | 70 | static void sweep_code_cache(); // Concurrent part of sweep job |
never@1893 | 71 | static void possibly_sweep(); // Compiler threads call this to sweep |
duke@435 | 72 | |
duke@435 | 73 | static void notify(nmethod* nm) { |
duke@435 | 74 | // Perform a full scan of the code cache from the beginning. No |
duke@435 | 75 | // need to synchronize the setting of this flag since it only |
duke@435 | 76 | // changes to false at safepoint so we can never overwrite it with false. |
duke@435 | 77 | _rescan = true; |
duke@435 | 78 | } |
kvn@1637 | 79 | |
kvn@1637 | 80 | static void handle_full_code_cache(bool is_full); // Called by compilers who fail to allocate |
kvn@1637 | 81 | static void speculative_disconnect_nmethods(bool was_full); // Called by vm op to deal with alloc failure |
kvn@1637 | 82 | |
kvn@1637 | 83 | static void set_was_full(bool state) { _was_full = state; } |
kvn@1637 | 84 | static bool was_full() { return _was_full; } |
duke@435 | 85 | }; |
stefank@2314 | 86 | |
stefank@2314 | 87 | #endif // SHARE_VM_RUNTIME_SWEEPER_HPP |