Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright 2002-2005 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.

  *

  */

 //

 // An object for encapsulating the machine/os dependent part of a JavaThread frame state

 //

 class JavaThread;

 class JavaFrameAnchor VALUE_OBJ_CLASS_SPEC {

 // Too many friends...

 friend class CallNativeDirectNode;

 friend class OptoRuntime;

 friend class Runtime1;

 friend class StubAssembler;

 friend class CallRuntimeDirectNode;

 friend class MacroAssembler;

 friend class InterpreterGenerator;

 friend class LIR_Assembler;

 friend class GraphKit;

 friend class StubGenerator;

 friend class JavaThread;

 friend class frame;

 friend class VMStructs;

 friend class BytecodeInterpreter;

 friend class JavaCallWrapper;

  private:

   //

   // Whenever _last_Java_sp != NULL other anchor fields MUST be valid!

   // The stack may not be walkable [check with walkable() ] but the values must be valid.

   // The profiler apparently depends on this.

   //

   intptr_t* volatile _last_Java_sp;

   // Whenever we call from Java to native we can not be assured that the return

   // address that composes the last_Java_frame will be in an accessible location

   // so calls from Java to native store that pc (or one good enough to locate

   // the oopmap) in the frame anchor. Since the frames that call from Java to

   // native are never deoptimized we never need to patch the pc and so this

   // is acceptable.

   volatile  address _last_Java_pc;

   // tells whether the last Java frame is set

   // It is important that when last_Java_sp != NULL that the rest of the frame

   // anchor (including platform specific) all be valid.

   bool has_last_Java_frame() const                   { return _last_Java_sp != NULL; }

   // This is very dangerous unless sp == NULL

   // Invalidate the anchor so that has_last_frame is false

   // and no one should look at the other fields.

   void zap(void)                                     { _last_Java_sp = NULL; }

 #include "incls/_javaFrameAnchor_pd.hpp.incl"

 public:

   JavaFrameAnchor()                              { clear(); }

   JavaFrameAnchor(JavaFrameAnchor *src)          { copy(src); }

   address last_Java_pc(void)                     { return _last_Java_pc; }

   void set_last_Java_pc(address pc)              { _last_Java_pc = pc; }

   // Assembly stub generation helpers

   static ByteSize last_Java_sp_offset()          { return byte_offset_of(JavaFrameAnchor, _last_Java_sp); }

   static ByteSize last_Java_pc_offset()          { return byte_offset_of(JavaFrameAnchor, _last_Java_pc); }

 };