diff src/os_cpu/linux_sparc/vm/thread_linux_sparc.cpp @ 122:435e64505015

6693457: Open-source hotspot linux-sparc support Summary: Move os_cpu/linux_sparc from closed to open Reviewed-by: kamg
author phh
date Thu, 24 Apr 2008 15:07:57 -0400
parents
children d1605aabd0a1
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/os_cpu/linux_sparc/vm/thread_linux_sparc.cpp	Thu Apr 24 15:07:57 2008 -0400
@@ -0,0 +1,107 @@
+/*
+ * 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_linux_sparc.cpp.incl"
+
+// 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;
+}