Initial load

hotspot/src/cpu/x86/vm/javaFrameAnchor_x86.hpp

@@ -0,0 +1,79 @@
+/*
+ * Copyright 2002-2007 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.
+ *
+ */
+
+private:
+
+  // FP value associated with _last_Java_sp:
+  intptr_t* volatile        _last_Java_fp;           // pointer is volatile not what it points to
+
+public:
+  // Each arch must define reset, save, restore
+  // These are used by objects that only care about:
+  //  1 - initializing a new state (thread creation, javaCalls)
+  //  2 - saving a current state (javaCalls)
+  //  3 - restoring an old state (javaCalls)
+
+  void clear(void) {
+    // clearing _last_Java_sp must be first
+    _last_Java_sp = NULL;
+    // fence?
+    _last_Java_fp = NULL;
+    _last_Java_pc = NULL;
+  }
+
+  void copy(JavaFrameAnchor* src) {
+    // In order to make sure the transition state is valid for "this"
+    // We must clear _last_Java_sp before copying the rest of the new data
+    //
+    // Hack Alert: Temporary bugfix for 4717480/4721647
+    // To act like previous version (pd_cache_state) don't NULL _last_Java_sp
+    // unless the value is changing
+    //
+    if (_last_Java_sp != src->_last_Java_sp)
+      _last_Java_sp = NULL;
+
+    _last_Java_fp = src->_last_Java_fp;
+    _last_Java_pc = src->_last_Java_pc;
+    // Must be last so profiler will always see valid frame if has_last_frame() is true
+    _last_Java_sp = src->_last_Java_sp;
+  }
+
+  // Always walkable
+  bool walkable(void) { return true; }
+  // Never any thing to do since we are always walkable and can find address of return addresses
+  void make_walkable(JavaThread* thread) { }
+
+  intptr_t* last_Java_sp(void) const             { return _last_Java_sp; }
+
+private:
+
+  static ByteSize last_Java_fp_offset()          { return byte_offset_of(JavaFrameAnchor, _last_Java_fp); }
+
+public:
+
+  void set_last_Java_sp(intptr_t* sp)            { _last_Java_sp = sp; }
+
+  intptr_t*   last_Java_fp(void)                     { return _last_Java_fp; }
+  // Assert (last_Java_sp == NULL || fp == NULL)
+  void set_last_Java_fp(intptr_t* fp)                { _last_Java_fp = fp; }