Thu, 12 Mar 2009 10:37:46 -0700
6791178: Specialize for zero as the compressed oop vm heap base
Summary: Use zero based compressed oops if java heap is below 32gb and unscaled compressed oops if java heap is below 4gb.
Reviewed-by: never, twisti, jcoomes, coleenp
duke@435 | 1 | /* |
duke@435 | 2 | * Copyright 2003-2006 Sun Microsystems, Inc. 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 | * |
duke@435 | 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
duke@435 | 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
duke@435 | 21 | * have any questions. |
duke@435 | 22 | * |
duke@435 | 23 | */ |
duke@435 | 24 | |
duke@435 | 25 | # include "incls/_precompiled.incl" |
duke@435 | 26 | # include "incls/_vmError_solaris.cpp.incl" |
duke@435 | 27 | |
duke@435 | 28 | #include <sys/types.h> |
duke@435 | 29 | #include <sys/wait.h> |
duke@435 | 30 | #include <signal.h> |
duke@435 | 31 | |
duke@435 | 32 | void VMError::show_message_box(char *buf, int buflen) { |
duke@435 | 33 | bool yes; |
duke@435 | 34 | do { |
duke@435 | 35 | error_string(buf, buflen); |
duke@435 | 36 | int len = (int)strlen(buf); |
duke@435 | 37 | char *p = &buf[len]; |
duke@435 | 38 | |
duke@435 | 39 | jio_snprintf(p, buflen - len, |
duke@435 | 40 | "\n\n" |
duke@435 | 41 | "Do you want to debug the problem?\n\n" |
duke@435 | 42 | "To debug, run 'dbx - %d'; then switch to thread " INTX_FORMAT "\n" |
duke@435 | 43 | "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n" |
duke@435 | 44 | "Otherwise, press RETURN to abort...", |
duke@435 | 45 | os::current_process_id(), os::current_thread_id()); |
duke@435 | 46 | |
duke@435 | 47 | yes = os::message_box("Unexpected Error", buf); |
duke@435 | 48 | |
duke@435 | 49 | if (yes) { |
duke@435 | 50 | // yes, user asked VM to launch debugger |
duke@435 | 51 | jio_snprintf(buf, buflen, "dbx - %d", os::current_process_id()); |
duke@435 | 52 | |
duke@435 | 53 | os::fork_and_exec(buf); |
duke@435 | 54 | yes = false; |
duke@435 | 55 | } |
duke@435 | 56 | } while (yes); |
duke@435 | 57 | } |
duke@435 | 58 | |
duke@435 | 59 | // Space for our "saved" signal flags and handlers |
duke@435 | 60 | static int resettedSigflags[2]; |
duke@435 | 61 | static address resettedSighandler[2]; |
duke@435 | 62 | |
duke@435 | 63 | static void save_signal(int idx, int sig) |
duke@435 | 64 | { |
duke@435 | 65 | struct sigaction sa; |
duke@435 | 66 | sigaction(sig, NULL, &sa); |
duke@435 | 67 | resettedSigflags[idx] = sa.sa_flags; |
duke@435 | 68 | resettedSighandler[idx] = (sa.sa_flags & SA_SIGINFO) |
duke@435 | 69 | ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) |
duke@435 | 70 | : CAST_FROM_FN_PTR(address, sa.sa_handler); |
duke@435 | 71 | } |
duke@435 | 72 | |
duke@435 | 73 | int VMError::get_resetted_sigflags(int sig) { |
duke@435 | 74 | if(SIGSEGV == sig) { |
duke@435 | 75 | return resettedSigflags[0]; |
duke@435 | 76 | } else if(SIGBUS == sig) { |
duke@435 | 77 | return resettedSigflags[1]; |
duke@435 | 78 | } |
duke@435 | 79 | return -1; |
duke@435 | 80 | } |
duke@435 | 81 | |
duke@435 | 82 | address VMError::get_resetted_sighandler(int sig) { |
duke@435 | 83 | if(SIGSEGV == sig) { |
duke@435 | 84 | return resettedSighandler[0]; |
duke@435 | 85 | } else if(SIGBUS == sig) { |
duke@435 | 86 | return resettedSighandler[1]; |
duke@435 | 87 | } |
duke@435 | 88 | return NULL; |
duke@435 | 89 | } |
duke@435 | 90 | |
duke@435 | 91 | static void crash_handler(int sig, siginfo_t* info, void* ucVoid) { |
duke@435 | 92 | // unmask current signal |
duke@435 | 93 | sigset_t newset; |
duke@435 | 94 | sigemptyset(&newset); |
duke@435 | 95 | sigaddset(&newset, sig); |
duke@435 | 96 | sigprocmask(SIG_UNBLOCK, &newset, NULL); |
duke@435 | 97 | |
duke@435 | 98 | VMError err(NULL, sig, NULL, info, ucVoid); |
duke@435 | 99 | err.report_and_die(); |
duke@435 | 100 | } |
duke@435 | 101 | |
duke@435 | 102 | void VMError::reset_signal_handlers() { |
duke@435 | 103 | // Save sigflags for resetted signals |
duke@435 | 104 | save_signal(0, SIGSEGV); |
duke@435 | 105 | save_signal(1, SIGBUS); |
duke@435 | 106 | os::signal(SIGSEGV, CAST_FROM_FN_PTR(void *, crash_handler)); |
duke@435 | 107 | os::signal(SIGBUS, CAST_FROM_FN_PTR(void *, crash_handler)); |
duke@435 | 108 | } |