hotspot/src/os_cpu/linux_sparc/vm/thread_linux_sparc.cpp
author katleman
Thu, 13 Aug 2015 12:20:11 -0700
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child 37439 e8970711113b
permissions -rw-r--r--
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/*
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 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include "precompiled.hpp"
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#include "runtime/frame.inline.hpp"
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#include "runtime/thread.inline.hpp"
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// For Forte Analyzer AsyncGetCallTrace profiling support - thread is
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// currently interrupted by SIGPROF
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bool JavaThread::pd_get_top_frame_for_signal_handler(frame* fr_addr,
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                                                     void* ucontext,
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                                                     bool isInJava) {
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  assert(Thread::current() == this, "caller must be current thread");
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  assert(this->is_Java_thread(), "must be JavaThread");
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  JavaThread* jt = (JavaThread *)this;
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  if (!isInJava) {
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    // make_walkable flushes register windows and grabs last_Java_pc
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    // which can not be done if the ucontext sp matches last_Java_sp
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    // stack walking utilities assume last_Java_pc set if marked flushed
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    jt->frame_anchor()->make_walkable(jt);
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  }
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  // If we have a walkable last_Java_frame, then we should use it
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  // even if isInJava == true. It should be more reliable than
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  // ucontext info.
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  if (jt->has_last_Java_frame() && jt->frame_anchor()->walkable()) {
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    *fr_addr = jt->pd_last_frame();
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    return true;
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  }
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  ucontext_t* uc = (ucontext_t*) ucontext;
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  // At this point, we don't have a walkable last_Java_frame, so
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  // we try to glean some information out of the ucontext.
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  intptr_t* ret_sp;
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  ExtendedPC addr =
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    os::fetch_frame_from_context(uc, &ret_sp,
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                                 NULL /* ret_fp only used on X86 */);
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  if (addr.pc() == NULL || ret_sp == NULL) {
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    // ucontext wasn't useful
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    return false;
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  }
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  // we were running Java code when SIGPROF came in
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  if (isInJava) {
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    // If we have a last_Java_sp, then the SIGPROF signal caught us
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    // right when we were transitioning from _thread_in_Java to a new
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    // JavaThreadState. We use last_Java_sp instead of the sp from
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    // the ucontext since it should be more reliable.
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    if (jt->has_last_Java_frame()) {
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      ret_sp = jt->last_Java_sp();
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    }
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    // Implied else: we don't have a last_Java_sp so we use what we
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    // got from the ucontext.
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    frame ret_frame(ret_sp, frame::unpatchable, addr.pc());
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    if (!ret_frame.safe_for_sender(jt)) {
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      // nothing else to try if the frame isn't good
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      return false;
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    }
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    *fr_addr = ret_frame;
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    return true;
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  }
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  // At this point, we know we weren't running Java code. We might
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  // have a last_Java_sp, but we don't have a walkable frame.
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  // However, we might still be able to construct something useful
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  // if the thread was running native code.
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  if (jt->has_last_Java_frame()) {
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    assert(!jt->frame_anchor()->walkable(), "case covered above");
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    if (jt->thread_state() == _thread_in_native) {
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      frame ret_frame(jt->last_Java_sp(), frame::unpatchable, addr.pc());
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      if (!ret_frame.safe_for_sender(jt)) {
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        // nothing else to try if the frame isn't good
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        return false;
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      }
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      *fr_addr = ret_frame;
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      return true;
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    }
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  }
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  // nothing else to try
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  return false;
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}
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void JavaThread::cache_global_variables() { }
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