Mercurial > hg > truffle
view src/os_cpu/linux_sparc/vm/thread_linux_sparc.cpp @ 9228:bc82cde765b9
Disabled access using the getter in the generated code to avoid frame escapes in PE.
author | Christian Humer <christian.humer@gmail.com> |
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date | Mon, 22 Apr 2013 16:39:12 +0200 |
parents | f34d701e952e |
children |
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/* * Copyright (c) 2003, 2010, 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 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"); assert(this->is_Java_thread(), "must be JavaThread"); JavaThread* jt = (JavaThread *)this; if (!isInJava) { // 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::fetch_frame_from_context(uc, &ret_sp, NULL /* ret_fp only used on X86 */); if (addr.pc() == NULL || ret_sp == NULL) { // ucontext wasn't useful return false; } // we were running Java code when SIGPROF came in if (isInJava) { // 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(); } // Implied else: we don't have a last_Java_sp so we use what we // got from the ucontext. frame ret_frame(ret_sp, frame::unpatchable, addr.pc()); if (!ret_frame.safe_for_sender(jt)) { // nothing else to try if the frame isn't good return false; } *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"); if (jt->thread_state() == _thread_in_native) { frame ret_frame(jt->last_Java_sp(), frame::unpatchable, addr.pc()); if (!ret_frame.safe_for_sender(jt)) { // nothing else to try if the frame isn't good return false; } *fr_addr = ret_frame; return true; } } // nothing else to try return false; } void JavaThread::cache_global_variables() { }