javaFrameAnchor.hpp revision 6402:2377269bd73d 
1/*
2 * Copyright (c) 2002, 2011, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
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23 */
24
25#ifndef SHARE_VM_RUNTIME_JAVAFRAMEANCHOR_HPP
26#define SHARE_VM_RUNTIME_JAVAFRAMEANCHOR_HPP
27
28#include "utilities/globalDefinitions.hpp"
29#include "runtime/orderAccess.inline.hpp"
30
31//
32// An object for encapsulating the machine/os dependent part of a JavaThread frame state
33//
34class JavaThread;
35
36class JavaFrameAnchor VALUE_OBJ_CLASS_SPEC {
37// Too many friends...
38friend class CallNativeDirectNode;
39friend class OptoRuntime;
40friend class Runtime1;
41friend class StubAssembler;
42friend class CallRuntimeDirectNode;
43friend class MacroAssembler;
44friend class InterpreterGenerator;
45friend class LIR_Assembler;
46friend class GraphKit;
47friend class StubGenerator;
48friend class JavaThread;
49friend class frame;
50friend class VMStructs;
51friend class BytecodeInterpreter;
52friend class JavaCallWrapper;
53
54 private:
55  //
56  // Whenever _last_Java_sp != NULL other anchor fields MUST be valid!
57  // The stack may not be walkable [check with walkable() ] but the values must be valid.
58  // The profiler apparently depends on this.
59  //
60  intptr_t* volatile _last_Java_sp;
61
62  // Whenever we call from Java to native we can not be assured that the return
63  // address that composes the last_Java_frame will be in an accessible location
64  // so calls from Java to native store that pc (or one good enough to locate
65  // the oopmap) in the frame anchor. Since the frames that call from Java to
66  // native are never deoptimized we never need to patch the pc and so this
67  // is acceptable.
68  volatile  address _last_Java_pc;
69
70  // tells whether the last Java frame is set
71  // It is important that when last_Java_sp != NULL that the rest of the frame
72  // anchor (including platform specific) all be valid.
73
74  bool has_last_Java_frame() const                   { return _last_Java_sp != NULL; }
75  // This is very dangerous unless sp == NULL
76  // Invalidate the anchor so that has_last_frame is false
77  // and no one should look at the other fields.
78  void zap(void)                                     { _last_Java_sp = NULL; }
79
80#ifdef TARGET_ARCH_x86
81# include "javaFrameAnchor_x86.hpp"
82#endif
83#ifdef TARGET_ARCH_sparc
84# include "javaFrameAnchor_sparc.hpp"
85#endif
86#ifdef TARGET_ARCH_zero
87# include "javaFrameAnchor_zero.hpp"
88#endif
89#ifdef TARGET_ARCH_arm
90# include "javaFrameAnchor_arm.hpp"
91#endif
92#ifdef TARGET_ARCH_ppc
93# include "javaFrameAnchor_ppc.hpp"
94#endif
95
96
97public:
98  JavaFrameAnchor()                              { clear(); }
99  JavaFrameAnchor(JavaFrameAnchor *src)          { copy(src); }
100
101  void set_last_Java_pc(address pc)              { _last_Java_pc = pc; }
102
103  // Assembly stub generation helpers
104
105  static ByteSize last_Java_sp_offset()          { return byte_offset_of(JavaFrameAnchor, _last_Java_sp); }
106  static ByteSize last_Java_pc_offset()          { return byte_offset_of(JavaFrameAnchor, _last_Java_pc); }
107
108};
109
110#endif // SHARE_VM_RUNTIME_JAVAFRAMEANCHOR_HPP
111