author | dcubed |
Fri, 13 Aug 2010 07:33:20 -0700 | |
changeset 6190 | 2ce445f727d8 |
parent 6176 | 4d9030fe341f |
child 7397 | 5b173b4ca846 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2002, 2005, 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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// |
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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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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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}; |