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src/os_cpu/solaris_sparc/vm/thread_solaris_sparc.cpp@a61af66fc99e (annotated)

src/os_cpu/solaris_sparc/vm/thread_solaris_sparc.cpp

Sat, 01 Dec 2007 00:00:00 +0000

author

duke

date

Sat, 01 Dec 2007 00:00:00 +0000

changeset 435

a61af66fc99e

child 542

93b6525e3b82

permissions

-rw-r--r--

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duke@435	1	/*
duke@435	2	* Copyright 2003-2004 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/_thread_solaris_sparc.cpp.incl"
duke@435	27
duke@435	28	// For Forte Analyzer AsyncGetCallTrace profiling support - thread is
duke@435	29	// currently interrupted by SIGPROF
duke@435	30	//
duke@435	31	// NOTE: On Solaris, register windows are flushed in the signal handler
duke@435	32	// except for possibly the top frame.
duke@435	33	//
duke@435	34	bool JavaThread::pd_get_top_frame_for_signal_handler(frame* fr_addr,
duke@435	35	void* ucontext, bool isInJava) {
duke@435	36
duke@435	37	assert(Thread::current() == this, "caller must be current thread");
duke@435	38	assert(this->is_Java_thread(), "must be JavaThread");
duke@435	39
duke@435	40	JavaThread* jt = (JavaThread *)this;
duke@435	41
duke@435	42	if (!isInJava) {
duke@435	43	// make_walkable flushes register windows and grabs last_Java_pc
duke@435	44	// which can not be done if the ucontext sp matches last_Java_sp
duke@435	45	// stack walking utilities assume last_Java_pc set if marked flushed
duke@435	46	jt->frame_anchor()->make_walkable(jt);
duke@435	47	}
duke@435	48
duke@435	49	// If we have a walkable last_Java_frame, then we should use it
duke@435	50	// even if isInJava == true. It should be more reliable than
duke@435	51	// ucontext info.
duke@435	52	if (jt->has_last_Java_frame() && jt->frame_anchor()->walkable()) {
duke@435	53	#if 0
duke@435	54	// This sanity check may not be needed with the new frame
duke@435	55	// walking code. Remove it for now.
duke@435	56	if (!jt->frame_anchor()->post_Java_state_is_pc()
duke@435	57	&& frame::next_younger_sp_or_null(last_Java_sp(),
duke@435	58	jt->frame_anchor()->post_Java_sp()) == NULL) {
duke@435	59	// the anchor contains an SP, but the frame is not walkable
duke@435	60	// because post_Java_sp isn't valid relative to last_Java_sp
duke@435	61	return false;
duke@435	62	}
duke@435	63	#endif
duke@435	64	*fr_addr = jt->pd_last_frame();
duke@435	65	return true;
duke@435	66	}
duke@435	67
duke@435	68	ucontext_t* uc = (ucontext_t*) ucontext;
duke@435	69
duke@435	70	// At this point, we don't have a walkable last_Java_frame, so
duke@435	71	// we try to glean some information out of the ucontext.
duke@435	72	intptr_t* ret_sp;
duke@435	73	ExtendedPC addr = os::Solaris::fetch_frame_from_ucontext(this, uc,
duke@435	74	&ret_sp, NULL /* ret_fp only used on Solaris X86 */);
duke@435	75	if (addr.pc() == NULL || ret_sp == NULL) {
duke@435	76	// ucontext wasn't useful
duke@435	77	return false;
duke@435	78	}
duke@435	79
duke@435	80	// we were running Java code when SIGPROF came in
duke@435	81	if (isInJava) {
duke@435	82	// If we have a last_Java_sp, then the SIGPROF signal caught us
duke@435	83	// right when we were transitioning from _thread_in_Java to a new
duke@435	84	// JavaThreadState. We use last_Java_sp instead of the sp from
duke@435	85	// the ucontext since it should be more reliable.
duke@435	86	if (jt->has_last_Java_frame()) {
duke@435	87	ret_sp = jt->last_Java_sp();
duke@435	88	}
duke@435	89	// Implied else: we don't have a last_Java_sp so we use what we
duke@435	90	// got from the ucontext.
duke@435	91
duke@435	92	frame ret_frame(ret_sp, frame::unpatchable, addr.pc());
duke@435	93	if (!ret_frame.safe_for_sender(jt)) {
duke@435	94	// nothing else to try if the frame isn't good
duke@435	95	return false;
duke@435	96	}
duke@435	97	*fr_addr = ret_frame;
duke@435	98	return true;
duke@435	99	}
duke@435	100
duke@435	101	// At this point, we know we weren't running Java code. We might
duke@435	102	// have a last_Java_sp, but we don't have a walkable frame.
duke@435	103	// However, we might still be able to construct something useful
duke@435	104	// if the thread was running native code.
duke@435	105	if (jt->has_last_Java_frame()) {
duke@435	106	assert(!jt->frame_anchor()->walkable(), "case covered above");
duke@435	107
duke@435	108	if (jt->thread_state() == _thread_in_native) {
duke@435	109	frame ret_frame(jt->last_Java_sp(), frame::unpatchable, addr.pc());
duke@435	110	if (!ret_frame.safe_for_sender(jt)) {
duke@435	111	// nothing else to try if the frame isn't good
duke@435	112	return false;
duke@435	113	}
duke@435	114	*fr_addr = ret_frame;
duke@435	115	return true;
duke@435	116	}
duke@435	117	}
duke@435	118
duke@435	119	// nothing else to try
duke@435	120	return false;
duke@435	121	}