88 lines
3.4 KiB
C++
88 lines
3.4 KiB
C++
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/*
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* Copyright 2002-2005 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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*/
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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 InterpreterGenerator;
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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 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 "incls/_javaFrameAnchor_pd.hpp.incl"
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public:
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JavaFrameAnchor() { clear(); }
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JavaFrameAnchor(JavaFrameAnchor *src) { copy(src); }
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address last_Java_pc(void) { return _last_Java_pc; }
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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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