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src/os/linux/vm/vmError_linux.cpp@833b0f92429a (annotated)

src/os/linux/vm/vmError_linux.cpp

Wed, 27 Aug 2014 08:19:12 -0400

author

zgu

date

Wed, 27 Aug 2014 08:19:12 -0400

changeset 7074

833b0f92429a

parent 4154

c3e799c37717

child 6876

710a3c8b516e

permissions

-rw-r--r--

8046598: Scalable Native memory tracking development
Summary: Enhance scalability of native memory tracking
Reviewed-by: coleenp, ctornqvi, gtriantafill

duke@435	1	/*
stefank@2314	2	* Copyright (c) 2003, 2010, 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	#include "precompiled.hpp"
stefank@2314	26	#include "runtime/arguments.hpp"
stefank@2314	27	#include "runtime/os.hpp"
stefank@2314	28	#include "runtime/thread.hpp"
stefank@2314	29	#include "utilities/vmError.hpp"
duke@435	30
duke@435	31	#include <sys/types.h>
duke@435	32	#include <sys/wait.h>
duke@435	33	#include <sys/syscall.h>
duke@435	34	#include <unistd.h>
duke@435	35	#include <signal.h>
duke@435	36
duke@435	37	void VMError::show_message_box(char *buf, int buflen) {
duke@435	38	bool yes;
duke@435	39	do {
duke@435	40	error_string(buf, buflen);
duke@435	41	int len = (int)strlen(buf);
duke@435	42	char *p = &buf[len];
duke@435	43
duke@435	44	jio_snprintf(p, buflen - len,
duke@435	45	"\n\n"
duke@435	46	"Do you want to debug the problem?\n\n"
vlivanov@4154	47	"To debug, run 'gdb /proc/%d/exe %d'; then switch to thread " UINTX_FORMAT " (" INTPTR_FORMAT ")\n"
duke@435	48	"Enter 'yes' to launch gdb automatically (PATH must include gdb)\n"
duke@435	49	"Otherwise, press RETURN to abort...",
duke@435	50	os::current_process_id(), os::current_process_id(),
twisti@2350	51	os::current_thread_id(), os::current_thread_id());
duke@435	52
duke@435	53	yes = os::message_box("Unexpected Error", buf);
duke@435	54
duke@435	55	if (yes) {
duke@435	56	// yes, user asked VM to launch debugger
duke@435	57	jio_snprintf(buf, buflen, "gdb /proc/%d/exe %d",
duke@435	58	os::current_process_id(), os::current_process_id());
duke@435	59
duke@435	60	os::fork_and_exec(buf);
duke@435	61	yes = false;
duke@435	62	}
duke@435	63	} while (yes);
duke@435	64	}
duke@435	65
duke@435	66	// Space for our "saved" signal flags and handlers
duke@435	67	static int resettedSigflags[2];
duke@435	68	static address resettedSighandler[2];
duke@435	69
duke@435	70	static void save_signal(int idx, int sig)
duke@435	71	{
duke@435	72	struct sigaction sa;
duke@435	73	sigaction(sig, NULL, &sa);
duke@435	74	resettedSigflags[idx] = sa.sa_flags;
duke@435	75	resettedSighandler[idx] = (sa.sa_flags & SA_SIGINFO)
duke@435	76	? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
duke@435	77	: CAST_FROM_FN_PTR(address, sa.sa_handler);
duke@435	78	}
duke@435	79
duke@435	80	int VMError::get_resetted_sigflags(int sig) {
duke@435	81	if(SIGSEGV == sig) {
duke@435	82	return resettedSigflags[0];
duke@435	83	} else if(SIGBUS == sig) {
duke@435	84	return resettedSigflags[1];
duke@435	85	}
duke@435	86	return -1;
duke@435	87	}
duke@435	88
duke@435	89	address VMError::get_resetted_sighandler(int sig) {
duke@435	90	if(SIGSEGV == sig) {
duke@435	91	return resettedSighandler[0];
duke@435	92	} else if(SIGBUS == sig) {
duke@435	93	return resettedSighandler[1];
duke@435	94	}
duke@435	95	return NULL;
duke@435	96	}
duke@435	97
duke@435	98	static void crash_handler(int sig, siginfo_t* info, void* ucVoid) {
duke@435	99	// unmask current signal
duke@435	100	sigset_t newset;
duke@435	101	sigemptyset(&newset);
duke@435	102	sigaddset(&newset, sig);
duke@435	103	sigprocmask(SIG_UNBLOCK, &newset, NULL);
duke@435	104
duke@435	105	VMError err(NULL, sig, NULL, info, ucVoid);
duke@435	106	err.report_and_die();
duke@435	107	}
duke@435	108
duke@435	109	void VMError::reset_signal_handlers() {
duke@435	110	// Save sigflags for resetted signals
duke@435	111	save_signal(0, SIGSEGV);
duke@435	112	save_signal(1, SIGBUS);
duke@435	113	os::signal(SIGSEGV, CAST_FROM_FN_PTR(void *, crash_handler));
duke@435	114	os::signal(SIGBUS, CAST_FROM_FN_PTR(void *, crash_handler));
duke@435	115	}