Mercurial > hg > truffle
view src/os_cpu/solaris_sparc/vm/thread_solaris_sparc.cpp @ 11:3c1dbcaaab1d
6621728: Heap inspection should not crash in the face of C-heap exhaustion
Summary: Deal more gracefully with situations where C-heap scratch space cannot be had
Reviewed-by: jmasa
author | ysr |
---|---|
date | Tue, 26 Feb 2008 15:57:49 -0800 |
parents | a61af66fc99e |
children | 93b6525e3b82 |
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/* * Copyright 2003-2004 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. * */ #include "incls/_precompiled.incl" #include "incls/_thread_solaris_sparc.cpp.incl" // 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"); 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()) { #if 0 // This sanity check may not be needed with the new frame // walking code. Remove it for now. if (!jt->frame_anchor()->post_Java_state_is_pc() && frame::next_younger_sp_or_null(last_Java_sp(), jt->frame_anchor()->post_Java_sp()) == NULL) { // the anchor contains an SP, but the frame is not walkable // because post_Java_sp isn't valid relative to last_Java_sp return false; } #endif *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; } // 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; }