jdk8-mips64-public/hotspot: comparison src/os_cpu/solaris_sparc/vm/thread_solaris

--1:000000000000
+:f90c822e73f8
+/*
+* Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.
+* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+*
+* This code is free software; you can redistribute it and/or modify it
+* under the terms of the GNU General Public License version 2 only, as
+* published by the Free Software Foundation.
+*
+* This code is distributed in the hope that it will be useful, but WITHOUT
+* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+* version 2 for more details (a copy is included in the LICENSE file that
+* accompanied this code).
+*
+* You should have received a copy of the GNU General Public License version
+* 2 along with this work; if not, write to the Free Software Foundation,
+* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+*
+* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+* or visit www.oracle.com if you need additional information or have any
+* questions.
+*
+*/
+#include "precompiled.hpp"
+#include "runtime/frame.inline.hpp"
+#include "runtime/thread.inline.hpp"
+// For Forte Analyzer AsyncGetCallTrace profiling support - thread is
+// currently interrupted by SIGPROF
+//
+// NOTE: On Solaris, register windows are flushed in the signal handler
+// except for possibly the top frame.
+//
+bool JavaThread::pd_get_top_frame_for_signal_handler(frame* fr_addr,
+void* ucontext, bool isInJava) {
+assert(Thread::current() == this, "caller must be current thread");
+return pd_get_top_frame(fr_addr, ucontext, isInJava, true);
+}
+bool JavaThread::pd_get_top_frame_for_profiling(frame* fr_addr, void* ucontext, bool isInJava) {
+// get ucontext somehow
+return pd_get_top_frame(fr_addr, ucontext, isInJava, false);
+}
+bool JavaThread::pd_get_top_frame(frame* fr_addr,
+void* ucontext, bool isInJava, bool makeWalkable) {
+assert(this->is_Java_thread(), "must be JavaThread");
+JavaThread* jt = (JavaThread *)this;
+if (!isInJava && makeWalkable) {
+// make_walkable flushes register windows and grabs last_Java_pc
+// which can not be done if the ucontext sp matches last_Java_sp
+// stack walking utilities assume last_Java_pc set if marked flushed
+jt->frame_anchor()->make_walkable(jt);
+}
+// If we have a walkable last_Java_frame, then we should use it
+// even if isInJava == true. It should be more reliable than
+// ucontext info.
+if (jt->has_last_Java_frame() && jt->frame_anchor()->walkable()) {
+*fr_addr = jt->pd_last_frame();
+return true;
+}
+ucontext_t* uc = (ucontext_t*) ucontext;
+// At this point, we don't have a walkable last_Java_frame, so
+// we try to glean some information out of the ucontext.
+intptr_t* ret_sp;
+ExtendedPC addr = os::Solaris::fetch_frame_from_ucontext(this, uc,
+&ret_sp, NULL /* ret_fp only used on Solaris X86 */);
+if (addr.pc() == NULL || ret_sp == NULL) {
+// ucontext wasn't useful
+return false;
+}
+frame ret_frame(ret_sp, frame::unpatchable, addr.pc());
+// we were running Java code when SIGPROF came in
+if (isInJava) {
+// If the frame we got is safe then it is most certainly valid
+if (ret_frame.safe_for_sender(jt)) {
+*fr_addr = ret_frame;
+return true;
+}
+// If it isn't safe then we can try several things to try and get
+// a good starting point.
+//
+// On sparc the frames are almost certainly walkable in the sense
+// of sp/fp linkages. However because of recycling of windows if
+// a piece of code does multiple save's where the initial save creates
+// a real frame with a return pc and the succeeding save's are used to
+// simply get free registers and have no real pc then the pc linkage on these
+// "inner" temporary frames will be bogus.
+// Since there is in general only a nesting level like
+// this one deep in general we'll try and unwind such an "inner" frame
+// here ourselves and see if it makes sense
+frame unwind_frame(ret_frame.fp(), frame::unpatchable, addr.pc());
+if (unwind_frame.safe_for_sender(jt)) {
+*fr_addr = unwind_frame;
+return true;
+}
+// Well that didn't work. Most likely we're toast on this tick
+// The previous code would try this. I think it is dubious in light
+// of changes to safe_for_sender and the unwind trick above but
+// if it gets us a safe frame who wants to argue.
+// If we have a last_Java_sp, then the SIGPROF signal caught us
+// right when we were transitioning from _thread_in_Java to a new
+// JavaThreadState. We use last_Java_sp instead of the sp from
+// the ucontext since it should be more reliable.
+if (jt->has_last_Java_frame()) {
+ret_sp = jt->last_Java_sp();
+frame ret_frame2(ret_sp, frame::unpatchable, addr.pc());
+if (ret_frame2.safe_for_sender(jt)) {
+*fr_addr = ret_frame2;
+return true;
+}
+}
+// This is the best we can do. We will only be able to decode the top frame
+*fr_addr = ret_frame;
+return true;
+}
+// At this point, we know we weren't running Java code. We might
+// have a last_Java_sp, but we don't have a walkable frame.
+// However, we might still be able to construct something useful
+// if the thread was running native code.
+if (jt->has_last_Java_frame()) {
+assert(!jt->frame_anchor()->walkable(), "case covered above");
+frame ret_frame(jt->last_Java_sp(), frame::unpatchable, addr.pc());
+*fr_addr = ret_frame;
+return true;
+}
+// nothing else to try but what we found initially
+*fr_addr = ret_frame;
+return true;
+}
+void JavaThread::cache_global_variables() { }

comparison: src/os_cpu/solaris_sparc/vm/thread_solaris_sparc.cpp

src/os_cpu/solaris_sparc/vm/thread_solaris_sparc.cpp

Mercurial > jdk8-mips64-public > hotspot / file comparison

comparison: src/os_cpu/solaris_sparc/vm/thread_solaris_sparc.cpp

src/os_cpu/solaris_sparc/vm/thread_solaris_sparc.cpp