src/hotspot/share/runtime/javaFrameAnchor.hpp
author erikj
Tue, 12 Sep 2017 19:03:39 +0200
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/*
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 * Copyright (c) 2002, 2016, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#ifndef SHARE_VM_RUNTIME_JAVAFRAMEANCHOR_HPP
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#define SHARE_VM_RUNTIME_JAVAFRAMEANCHOR_HPP
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#include "runtime/orderAccess.inline.hpp"
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#include "utilities/globalDefinitions.hpp"
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#include "utilities/macros.hpp"
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//
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// An object for encapsulating the machine/os dependent part of a JavaThread frame state
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//
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class JavaThread;
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class JavaFrameAnchor VALUE_OBJ_CLASS_SPEC {
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// Too many friends...
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friend class CallNativeDirectNode;
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friend class OptoRuntime;
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friend class Runtime1;
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friend class StubAssembler;
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friend class CallRuntimeDirectNode;
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friend class MacroAssembler;
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friend class LIR_Assembler;
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friend class GraphKit;
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friend class StubGenerator;
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friend class JavaThread;
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friend class frame;
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friend class VMStructs;
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friend class JVMCIVMStructs;
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friend class BytecodeInterpreter;
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friend class JavaCallWrapper;
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 private:
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  //
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  // Whenever _last_Java_sp != NULL other anchor fields MUST be valid!
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  // The stack may not be walkable [check with walkable() ] but the values must be valid.
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  // The profiler apparently depends on this.
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  //
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  intptr_t* volatile _last_Java_sp;
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  // Whenever we call from Java to native we can not be assured that the return
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  // address that composes the last_Java_frame will be in an accessible location
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  // so calls from Java to native store that pc (or one good enough to locate
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  // the oopmap) in the frame anchor. Since the frames that call from Java to
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  // native are never deoptimized we never need to patch the pc and so this
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  // is acceptable.
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  volatile  address _last_Java_pc;
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  // tells whether the last Java frame is set
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  // It is important that when last_Java_sp != NULL that the rest of the frame
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  // anchor (including platform specific) all be valid.
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  bool has_last_Java_frame() const                   { return _last_Java_sp != NULL; }
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  // This is very dangerous unless sp == NULL
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  // Invalidate the anchor so that has_last_frame is false
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  // and no one should look at the other fields.
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  void zap(void)                                     { _last_Java_sp = NULL; }
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#include CPU_HEADER(javaFrameAnchor)
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public:
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  JavaFrameAnchor()                              { clear(); }
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  JavaFrameAnchor(JavaFrameAnchor *src)          { copy(src); }
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  void set_last_Java_pc(address pc)              { _last_Java_pc = pc; }
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  // Assembly stub generation helpers
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  static ByteSize last_Java_sp_offset()          { return byte_offset_of(JavaFrameAnchor, _last_Java_sp); }
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  static ByteSize last_Java_pc_offset()          { return byte_offset_of(JavaFrameAnchor, _last_Java_pc); }
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};
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#endif // SHARE_VM_RUNTIME_JAVAFRAMEANCHOR_HPP