Mercurial > hg > truffle
annotate src/os/posix/vm/os_posix.hpp @ 21408:32ca2353accf
Truffle/Instrumentation: fix NPE hazard
author | Michael Van De Vanter <michael.van.de.vanter@oracle.com> |
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date | Sun, 17 May 2015 20:47:04 -0700 |
parents | 52b4284cb496 |
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1 /* |
17524 | 2 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 * |
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23 */ |
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24 |
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25 #ifndef OS_POSIX_VM_OS_POSIX_HPP |
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26 #define OS_POSIX_VM_OS_POSIX_HPP |
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27 class Posix { |
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28 friend class os; |
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29 |
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30 protected: |
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31 static void print_distro_info(outputStream* st); |
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32 static void print_rlimit_info(outputStream* st); |
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33 static void print_uname_info(outputStream* st); |
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34 static void print_libversion_info(outputStream* st); |
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35 static void print_load_average(outputStream* st); |
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36 |
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37 public: |
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38 |
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39 // Returns true if signal is valid. |
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40 static bool is_valid_signal(int sig); |
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41 |
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42 // Helper function, returns a string (e.g. "SIGILL") for a signal. |
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43 // Returned string is a constant. For unknown signals "UNKNOWN" is returned. |
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44 static const char* get_signal_name(int sig, char* out, size_t outlen); |
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45 |
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46 // Returns one-line short description of a signal set in a user provided buffer. |
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47 static const char* describe_signal_set_short(const sigset_t* set, char* buffer, size_t size); |
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48 |
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49 // Prints a short one-line description of a signal set. |
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50 static void print_signal_set_short(outputStream* st, const sigset_t* set); |
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51 |
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52 // Writes a one-line description of a combination of sigaction.sa_flags |
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53 // into a user provided buffer. Returns that buffer. |
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54 static const char* describe_sa_flags(int flags, char* buffer, size_t size); |
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55 |
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56 // Prints a one-line description of a combination of sigaction.sa_flags. |
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57 static void print_sa_flags(outputStream* st, int flags); |
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58 |
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59 // A POSIX conform, platform-independend siginfo print routine. |
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60 static void print_siginfo_brief(outputStream* os, const siginfo_t* si); |
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61 |
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62 }; |
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63 |
11151 | 64 /* |
65 * Crash protection for the watcher thread. Wrap the callback | |
66 * with a sigsetjmp and in case of a SIGSEGV/SIGBUS we siglongjmp | |
67 * back. | |
68 * To be able to use this - don't take locks, don't rely on destructors, | |
69 * don't make OS library calls, don't allocate memory, don't print, | |
70 * don't call code that could leave the heap / memory in an inconsistent state, | |
71 * or anything else where we are not in control if we suddenly jump out. | |
72 */ | |
73 class WatcherThreadCrashProtection : public StackObj { | |
74 public: | |
75 WatcherThreadCrashProtection(); | |
76 bool call(os::CrashProtectionCallback& cb); | |
77 | |
78 static void check_crash_protection(int signal, Thread* thread); | |
79 private: | |
80 void restore(); | |
81 sigjmp_buf _jmpbuf; | |
82 }; | |
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83 |
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84 #endif // OS_POSIX_VM_OS_POSIX_HPP |