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comparison src/share/vm/runtime/javaFrameAnchor.hpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children c18cbe5936b8
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1 /*
2 * Copyright 2002-2005 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24 //
25 // An object for encapsulating the machine/os dependent part of a JavaThread frame state
26 //
27 class JavaThread;
28
29 class JavaFrameAnchor VALUE_OBJ_CLASS_SPEC {
30 // Too many friends...
31 friend class CallNativeDirectNode;
32 friend class OptoRuntime;
33 friend class Runtime1;
34 friend class StubAssembler;
35 friend class CallRuntimeDirectNode;
36 friend class MacroAssembler;
37 friend class InterpreterGenerator;
38 friend class LIR_Assembler;
39 friend class GraphKit;
40 friend class StubGenerator;
41 friend class JavaThread;
42 friend class frame;
43 friend class VMStructs;
44 friend class BytecodeInterpreter;
45 friend class JavaCallWrapper;
46
47 private:
48 //
49 // Whenever _last_Java_sp != NULL other anchor fields MUST be valid!
50 // The stack may not be walkable [check with walkable() ] but the values must be valid.
51 // The profiler apparently depends on this.
52 //
53 intptr_t* volatile _last_Java_sp;
54
55 // Whenever we call from Java to native we can not be assured that the return
56 // address that composes the last_Java_frame will be in an accessible location
57 // so calls from Java to native store that pc (or one good enough to locate
58 // the oopmap) in the frame anchor. Since the frames that call from Java to
59 // native are never deoptimized we never need to patch the pc and so this
60 // is acceptable.
61 volatile address _last_Java_pc;
62
63 // tells whether the last Java frame is set
64 // It is important that when last_Java_sp != NULL that the rest of the frame
65 // anchor (including platform specific) all be valid.
66
67 bool has_last_Java_frame() const { return _last_Java_sp != NULL; }
68 // This is very dangerous unless sp == NULL
69 // Invalidate the anchor so that has_last_frame is false
70 // and no one should look at the other fields.
71 void zap(void) { _last_Java_sp = NULL; }
72
73 #include "incls/_javaFrameAnchor_pd.hpp.incl"
74
75 public:
76 JavaFrameAnchor() { clear(); }
77 JavaFrameAnchor(JavaFrameAnchor *src) { copy(src); }
78
79 address last_Java_pc(void) { return _last_Java_pc; }
80 void set_last_Java_pc(address pc) { _last_Java_pc = pc; }
81
82 // Assembly stub generation helpers
83
84 static ByteSize last_Java_sp_offset() { return byte_offset_of(JavaFrameAnchor, _last_Java_sp); }
85 static ByteSize last_Java_pc_offset() { return byte_offset_of(JavaFrameAnchor, _last_Java_pc); }
86
87 };